General circulation models (GCMs) use transient climate simulations to predict climate conditions in the future. Coarse-grid resolutions and process uncertainties necessitate the use of downscaling models to simulate precipitation. However, in the downscaling models, with multiple GCMs now available, selecting an atmospheric variable from a particular model which is representative of the ensemble mean becomes an important consideration. The variable convergence score (VCS) provides a simple yet meaningful approach to address this issue, providing a mechanism to evaluate variables against each other with respect to the stability they exhibit in future climate simulations. In this study, VCS methodology is applied to 10 atmospheric variables of particular interest in downscaling precipitation over India and also on a regional basis. The nested bias-correction methodology is used to remove the systematic biases in the GCMs simulations, and a single VCS curve is developed for the entire country. The generated VCS curve is expected to assist in quantifying the variable performance across different GCMs, thus reducing the uncertainty in climate impact–assessment studies. The results indicate higher consistency across GCMs for pressure and temperature, and lower consistency for precipitation and related variables. Regional assessments, while broadly consistent with the overall results, indicate low convergence in atmospheric attributes for the Northeastern parts of India.
", "keywords": [ "general circulation models", "climates", "precipitation", "simulation" ], "authors": [ { "name": "richa ojha", "org": "School of Civil Engineering, Purdue Univ., West Lafayette, IN 47906; formerly, Indian Institute of Science, Bangalore 560012, India." }, { "name": "d nagesh kumar", "org": "Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India; and Centre for Earth Sciences, Indian Institute of Science, Bangalore, India (corresponding author)." }, { "name": "ashish sharma", "org": "School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia." }, { "name": "raj n mehrotra", "org": "School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia." } ], "venue": "Journal of Hydrologic Engineering", "year": 2013 }, "U5uV4m24": { "id": "U5uV4m24", "title": "On the non-stationarity of hydrological response in anthropogenically unaffected catchments: an Australian perspective", "abstract": "", "keywords": "", "authors": [ { "name": "Hoori Ajami", "org": "School of Civil and Environmental Engineering, University of New South#N#Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South#N#Wales, Sydney, Australia" }, { "name": "Lawrence E. Band", "org": "Department of Geography and Institute for the Environment, University#N#of North Carolina, Chapel Hill, NC, USA" }, { "name": "Jason P. Evans", "org": "Climate Change Research Centre, University of New South Wales, Sydney,#N#Australia" }, { "name": "Narendra Kumar Tuteja", "org": "Environment and Research Division, Bureau of Meteorology, Canberra,#N#Australian Capital Territory, Australia" }, { "name": "Gnanathikkam E. Amirthanathan", "org": "Environment and Research Division, Bureau of Meteorology, Melbourne,#N#Victoria, Australia" }, { "name": "Mohammed Bari", "org": "Environment and Research Division, Bureau of Meteorology, Perth,#N#Western Australia, Australia" } ], "venue": "Hydrology and Earth System Sciences", "year": 2016 }, "guB2mCjO": { "id": "guB2mCjO", "title": "Addressing Spatial Dependence Bias in Climate Model Simulations—An Independent Component Analysis Approach", "abstract": "", "keywords": "", "authors": [ { "name": "Jannatun Nahar", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney NSW Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney NSW Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney NSW Australia" } ], "venue": "Water Resources Research", "year": 2018 }, "UlEZhzCK": { "id": "UlEZhzCK", "title": "A space and time scale-dependent nonlinear geostatistical approach for downscaling daily precipitation and temperature", "abstract": "", "keywords": [ "remote sensing", "climate models", "rainfall", "multivariate" ], "authors": [ { "name": "sanjeev kumar jha", "org": "nust school of civil and environmental engineering" }, { "name": "gregoire mariethoz", "org": "nust school of civil and environmental engineering" }, { "name": "jason p evans", "org": "university of new south wales" }, { "name": "matthew f mccabe", "org": "king abdullah university of science and technology" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2015 }, "0MD5DfxZ": { "id": "0MD5DfxZ", "title": "Development of a formal likelihood function for improved Bayesian inference of ephemeral catchments: DEVELOPMENT OF A FORMAL LIKELIHOOD FUNCTION", "abstract": "", "keywords": [], "authors": [ { "name": "tyler smith", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "raj n mehrotra", "org": "" }, { "name": "scott a sisson", "org": "" } ], "venue": "Water Resources Research", "year": 2010 }, "xfOJrV4k": { "id": "xfOJrV4k", "title": "Improving real-time inflow forecasting into hydropower reservoirs through a complementary modelling framework", "abstract": "", "keywords": [], "authors": [ { "name": "a s gragne", "org": "norwegian university of science and technology" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" }, { "name": "r c mehrotra", "org": "nust school of civil and environmental engineering" }, { "name": "knut alfredsen", "org": "norwegian university of science and technology" } ], "venue": "Hydrology and Earth System Sciences", "year": 2015 }, "chWe0cKD": { "id": "chWe0cKD", "title": "Mitigating parameter bias in hydrological modelling due to uncertainty in covariates", "abstract": "The uncertainty in hydrological model covariates, if ignored, introduces systematic bias in the parameters estimated. We introduce here a method to determine the true value of parameters given uncertainty in model inputs. This method, known as simulation extrapolation (SIMEX) operates on the basis of an empirical relationship between parameters and the level of input noise (or uncertainty). The method starts by generating a series of alternate model inputs by artificially adding white noise in increasing multiples of the known error variance. The resulting parameter sets allow us to formulate an empirical relationship between their values and the level of noise present. SIMEX is based on theory that the trend in alternate parameters can be extrapolated back to the notional error free zone. We illustrate the strength of SIMEX in improving skills of predictive models that use uncertain sea surface temperature anomaly (SSTA) data over the NINO3 region as predictor to the southern oscillation index (SOI), an alternate measure of the strength of the El Nino southern oscillation. Our hypothesis is that the higher magnitude of noise in the pre 1960 data period introduces bias to model parameters where SSTA is the input variable. The relatively error invariant southern oscillation index (SOI) is regressed over SSTA and calibrated using a subset of the series from 1900 to 1960. We validate the resulting models using the less erroneous 1960–2003 data period. Overall the application of SIMEX is found to reduce the residual predictive errors during the validation period.", "keywords": [ "parameter uncertainty", "simex", "southern oscillation index", "hydroclimatology", "relative error", "hydrological modelling", "prediction error", "parameter estimation", "prediction model", "el nino southern oscillation", "white noise" ], "authors": [ { "name": "Shahadat Chowdhury", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2007 }, "saPsGwXI": { "id": "saPsGwXI", "title": "A dimension range representation (DRR) measure for self-organizing maps", "abstract": "A common tool in exploratory data analysis, the self-organizing map, or SOM, is used for clustering and visualisation to discover patterns in large, high-dimensional data sets. The output map may be interpreted to gain an understanding of the structure of the original data set, correlations between variables, and the characteristics the clusters formed by placing the data on the map. However, if the map does not represent all dimensions of the data in an informative way, map interpretation may be misleading. Currently there is no measure of how well a SOM represents each dimension of a data set, and therefore how descriptive the map vectors are of the full structure of the data they represent. A dimension range representation (DRR) measure is proposed to quantify how well represented each dimension of the data set is by the map vectors of the SOM. This can be used to choose between different map size and shape options that could potentially represent a specific data set. Through examples, it is demonstrated how the DRR measure is used to inform the choice of map size and shape, leading to more informative insight into the original data set through examination of the output map. The self-organizing map is a popular technique for clustering and visualization.If the map vectors represent all dimensions of the data well, insight into the data set will be improved.A 'dimension range representation' measure is introduced to quantify coverage of the data by the map.Information gained from the map can be improved with optimal map size and shape.The DRR measure can be used to choose output map size and shape to improve insights.", "keywords": [ "extreme values", "coverage", "dimension", "self organizing maps" ], "authors": [ { "name": "stephanie clark", "org": "School of Mathematics and Statistics, University of New South Wales, UNSW, Sydney, NSW 2052, Australia" }, { "name": "Scott A. Sisson", "org": "School of Mathematics and Statistics, University of New South Wales, UNSW, Sydney, NSW 2052, Australia" }, { "name": "ashish sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, UNSW, Sydney, NSW 2052, Australia" } ], "venue": "Pattern Recognition", "year": 2015 }, "6MmUQCvb": { "id": "6MmUQCvb", "title": "An Assessment of GCM Skill in Simulating Persistence across Multiple Time Scales", "abstract": "", "keywords": [ "general circulation models", "wavelets", "teleconnections" ], "authors": [ { "name": "fiona johnson", "org": "" }, { "name": "seth westra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "a j pitman", "org": "" } ], "venue": "Journal of Climate", "year": 2011 }, "g6xIZevW": { "id": "g6xIZevW", "title": "A nonparametric approach for daily rainfall simulation", "abstract": "A nonparametric model for daily rainfall simulation is presented. Nearest neighbour methods are used to conditionally simulate rainfall spells and amounts. A “local” subset of the observed record is used to formulate the conditional densities needed for simulation. This provides an effective yet simple way to model local and seasonal features in the observed rainfall time series. The model is applied in two stages. First dry and wet spell lengths are conditionally simulated. Next rainfall amounts for each day of the wet spell are simulated assuming an order one Markov dependence structure. Higher order dependence is modelled by considering the number of days from start of the spell as an additional variable. Rainfall distributional characteristics are observed to have distinctly different characteristics depending on the length of the wet spell. A procedure is developed to reproduce such differences in the simulations. The model is applied to 123 years of daily rainfall from Sydney, Australia.", "keywords": [ "nearest neighbour", "daily rainfall", "daily rainfall simulation", "nonparametric", "spell length", "nonparametric approach", "seasonality", "time series", "higher order" ], "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Upmanu Lall", "org": "" } ], "venue": "Mathematics and Computers in Simulation - Special issue from IMACS sponsored conference: “MODSIM 97”", "year": 1999 }, "TES89Lmg": { "id": "TES89Lmg", "title": "How does the Interdecadal Pacific Oscillation affect design floods in Australia?: HOW DOES IPO AFFECT DESIGN FLOODS IN AUSTRALIA", "abstract": "", "keywords": "", "authors": [ { "name": "Alexander Pui", "org": "" }, { "name": "A. Lal", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2011 }, "OwSHAPXd": { "id": "OwSHAPXd", "title": "Impact of climate change on floods in the Brahmaputra basin using CMIP5 decadal predictions", "abstract": "", "keywords": [], "authors": [ { "name": "tushar apurv", "org": "" }, { "name": "rajeshwar mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "m goyal", "org": "" }, { "name": "subashisa dutta", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "kHqsmi5F": { "id": "kHqsmi5F", "title": "Attributing uncertainty in streamflow simulations due to variable inputs via the Quantile Flow Deviation metric", "abstract": "Every model to characterise a real world process is affected by uncertainty. Selecting a suitable model is a vital aspect of engineering planning and design. Observation or input errors make the prediction of modelled responses more uncertain. By way of a recently developed attribution metric, this study is aimed at developing a method for analysing variability in model inputs together with model structure variability to quantify their relative contributions in typical hydrological modelling applications. The Quantile Flow Deviation (QFD) metric is used to assess these alternate sources of uncertainty. The Australian Water Availability Project (AWAP) precipitation data for four different Australian catchments is used to analyse the impact of spatial rainfall variability on simulated streamflow variability via the QFD. The QFD metric attributes the variability in flow ensembles to uncertainty associated with the selection of a model structure and input time series. For the case study catchments, the relative contribution of input uncertainty due to rainfall is higher than that due to potential evapotranspiration, and overall input uncertainty is significant compared to model structure and parameter uncertainty. Overall, this study investigates the propagation of input uncertainty in a daily streamflow modelling scenario and demonstrates how input errors manifest across different streamflow magnitudes. (C) 2018 Published by Elsevier Ltd.", "keywords": [ "Input uncertainty", "Quantile Flow Deviation (QFD)", "Multi-site rainfall", "Model structure" ], "authors": [ { "name": "Syed Abu Shoaib", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "Lucy Marshall", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2018 }, "V1xH4FuC": { "id": "V1xH4FuC", "title": "Correcting for systematic biases in GCM simulations in the frequency domain", "abstract": "Summary Bias correction is considered as a critical post-processing step to remove systematic errors and improve the quality of General Circulation Model (GCM) simulations before their use in climate change impact assessment applications. A majority of the bias correction approaches correct for biases either at a single time scale or at multiple pre-specified time scales. An inappropriate or insufficient selection of time scales may lead to improper or sub-optimal bias corrected outputs, especially when persistence attributes across a range of scales are of interest. In this paper, we present a new bias correction approach that works in the frequency space and is independent of specific time scales. The approach is named as frequency-based bias correction (FBC). The usefulness of the approach is demonstrated by applying it to the monthly rainfall simulations of MIROC5 GCM over Australia and comparing the results with two other approaches, namely, empirical quantile mapping and recursive nesting bias correction, in cross validation. The comparison is based on the reproduction of various observed distribution and persistence attributes. Cross-validation results indicate that the proposed approach shows similar performance in terms of reproducing the first- and second-order moments of observed precipitation time series, however, outperforms with regard to persistence attributes. The approach shows high potential for use in downscaling and other climate change impact assessment studies, especially for the planning and design of hydrologic systems that are sensitive to the characterisation of persistence in the hydrologic time series.", "keywords": "", "authors": [ { "name": "Ha Nguyen", "org": "Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Rajeshwar Mehrotra", "org": "Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2016 }, "8GrqDPyU": { "id": "8GrqDPyU", "title": "Impact of the El Niño–Southern Oscillation, Indian Ocean Dipole, and Southern Annular Mode on Daily to Subdaily Rainfall Characteristics in East Australia", "abstract": "", "keywords": [ "regression analysis", "enso" ], "authors": [ { "name": "alexander pui", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "agus santoso", "org": "" }, { "name": "seth westra", "org": "" } ], "venue": "Monthly Weather Review", "year": 2012 }, "ada1dHJw": { "id": "ada1dHJw", "title": "Long-Range Niño-3.4 Predictions Using Pairwise Dynamic Combinations of Multiple Models", "abstract": "", "keywords": [], "authors": [ { "name": "Shahadat Chowdhury", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Climate", "year": 2009 }, "poCr745u": { "id": "poCr745u", "title": "Identifying Different Catchment States: An Application of Hierarchical Mixtures of Experts to Multiple Catchments", "abstract": "", "keywords": [ "publishing", "academic research", "commissioning" ], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "", "year": 2005 }, "C89WnHel": { "id": "C89WnHel", "title": "Multi-criteria evaluation of CMIP5 GCMs for climate change impact analysis", "abstract": "Abstract Climate change is expected to have severe impacts on global hydrological cycle along with food-water-energy nexus. Currently, there are many climate models used in predicting important climatic variables. Though there have been advances in the field, there are still many problems to be resolved related to reliability, uncertainty, and computing needs, among many others. In the present work, we have analyzed performance of 20 different global climate models (GCMs) from Climate Model Intercomparison Project Phase 5 (CMIP5) dataset over the Columbia River Basin (CRB) in the Pacific Northwest USA. We demonstrate a statistical multicriteria approach, using univariate and multivariate techniques, for selecting suitable GCMs to be used for climate change impact analysis in the region. Univariate methods includes mean, standard deviation, coefficient of variation, relative change (variability), Mann-Kendall test, and Kolmogorov-Smirnov test (KS-test); whereas multivariate methods used were principal component analysis (PCA), singular value decomposition (SVD), canonical correlation analysis (CCA), and cluster analysis. The analysis is performed on raw GCM data, i.e., before bias correction, for precipitation and temperature climatic variables for all the 20 models to capture the reliability and nature of the particular model at regional scale. The analysis is based on spatially averaged datasets of GCMs and observation for the period of 1970 to 2000. Ranking is provided to each of the GCMs based on the performance evaluated against gridded observational data on various temporal scales (daily, monthly, and seasonal). Results have provided insight into each of the methods and various statistical properties addressed by them employed in ranking GCMs. Further; evaluation was also performed for raw GCM simulations against different sets of gridded observational dataset in the area.", "keywords": [], "authors": [ { "name": "Ali Ahmadalipour", "org": "Department of Civil and Environmental Engineering, Portland State University, Portland, OR, 97201, USA" }, { "name": "Arun Rana", "org": "Department of Civil and Environmental Engineering, Portland State University, Portland, OR, 97201, USA" }, { "name": "Hamid Moradkhani", "org": "Department of Civil and Environmental Engineering, Portland State University, Portland, OR, 97201, USA" }, { "name": "Ashish Sharma", "org": "University of New South Wales, Sydney, Australia" } ], "venue": "Theoretical and Applied Climatology", "year": 2015 }, "l7DaLuiL": { "id": "l7DaLuiL", "title": "Radar rainfall error variance and its impact on radar rainfall calibration", "abstract": "The high degree of uncertainty in radar rainfall estimation is caused by the variability in the vertical profile of reflectivity, the errors in measurements of radar reflectivity, conversion of reflectivity to rainfall rate, and the error of using point rain gauge rainfall in representing mean-areal rainfall of a radar grid size in the radar rainfall calibration. Presented here is an approach that explicitly takes into account the variations in reliability of radar rainfall estimates associated with range from the radar in calibrating of Z – R relationship. The reliability of radar rainfall estimates is calculated from the proposed climatological variance of radar rainfall error model that accounts for rainfall intensity, nature of rainfall event and number of pulses averaged in obtaining a reflectivity pixel value. Modifications to the parametric and probability matching methods (PMM) are proposed to account for the reliability of the radar rainfall estimates at the gauge locations. Six months of reflectivity-rain gauge data from the Kurnell radar in Sydney, Australia are used to test the model. The result shows the improvements in accuracy of radar measurements of rainfall by incorporating the reliability of radar rainfall estimates in the PMM are about 10% and 5% compared with the conventional PMM and parametric Z – R relationship method, respectively.", "keywords": [ "weather radar", "radar rainfall error variance", "reliability", "rainfall", "calibration" ], "authors": [ { "name": "Siriluk Chumchean", "org": "" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Alan Seed", "org": "Cooperative Research Centre for Catchment Hydrology, Bureau of Meteorology, GPO Box 1289K, Melbourne, VIC 3001, Australia" } ], "venue": "Physics and Chemistry of the Earth", "year": 2003 }, "8f2Bhb0y": { "id": "8f2Bhb0y", "title": "Constraining continuous rainfall simulations for derived design flood estimation", "abstract": "Abstract Stochastic rainfall generation is important for a range of hydrologic and water resources applications. Stochastic rainfall can be generated using a number of models; however, preserving relevant attributes of the observed rainfall—including rainfall occurrence, variability and the magnitude of extremes—continues to be difficult. This paper develops an approach to constrain stochastically generated rainfall with an aim of preserving the intensity-durationfrequency (IFD) relationships of the observed data. Two main steps are involved. First, the generated annual maximum rainfall is corrected recursively by matching the generated intensity-frequency relationships to the target (observed) relationships. Second, the remaining (non-annual maximum) rainfall is rescaled such that the mass balance of the generated rain before and after scaling is maintained. The recursive correction is performed at selected storm durations to minimise the dependence between annual maximum values of higher and lower durations for the same year. This ensures that the resulting sequences remain true to the observed rainfall as well as represent the design extremes that may have been developed separately and are needed for compliance reasons. The method is tested on simulated 6 min rainfall series across five Australian stations with different climatic characteristics. The results suggest that the annual maximum and the IFD relationships are well reproduced after constraining the simulated rainfall. While our presentation focusses on the representation of design rainfall attributes (IFDs), the proposed approach can also be easily extended to constrain other attributes of the generated rainfall, providing an effective platform for post-processing of stochastic rainfall generators.", "keywords": "", "authors": [ { "name": "Fitsum Woldemeskel", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia" }, { "name": "R. Mehrotra", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia" }, { "name": "Seth Westra", "org": "School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, Australia" } ], "venue": "Journal of Hydrology", "year": 2016 }, "cy95JcGS": { "id": "cy95JcGS", "title": "Estimating Radar Precipitation in Cold Climates: The role of Air Temperature within a Nonparametric Framework", "abstract": "Abstract. The use of ground-based precipitation measurements in radar precipitationestimation is well known in radar hydrology. However, the approach of usinggauged precipitation and near-surface air temperature observations to improveradar precipitation estimates in cold climates is much less common. In coldclimates, precipitation is in the form of snow, rain or mixture of thetwo phases. Air temperature is intrinsic to the phase of the precipitationand could therefore be possible covariate in the models used to ascertainradar precipitation estimates. In the present study, we investigate the useof air temperature within non-parametric predictive framework to improveradar precipitation estimation for cold climates. A non-parametric predictivemodel is constructed with radar precipitation rate and air temperature aspredictor variables and gauge precipitation as an observed response using a k nearest neighbour ( k -nn) regression estimator. The relative importanceof the two predictors is ascertained using an information theory-basedweighting. Four years (2011–2015) of hourly radar precipitation rates fromthe Norwegian national radar network over the Oslo region, hourly gaugedprecipitation from 68 gauges and gridded observational air temperatures wereused to formulate the predictive model, hence making our investigationpossible. Gauged precipitation data were corrected for wind-inducedunder-catch before using them as true observed response. The predictive modelwith air temperature as an added covariate reduces root-mean-squareerror (RMSE) by up to 15 % compared to the model that uses radarprecipitation rate as the sole predictor. More than 80 % of gauge locationsin the study area showed improvement with the new method. Further, theassociated impact of air temperature became insignificant at more than 85 %of gauge locations when the near-surface air temperature was warmer than10 ∘ C, which indicates that the partial dependence of precipitationon air temperature is most useful for colder temperatures.", "keywords": "", "authors": [ { "name": "Kuganesan Sivasubramaniam", "org": "Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW2052, Australia" }, { "name": "Knut Alfredsen", "org": "Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway" } ], "venue": "Hydrology and Earth System Sciences Discussions", "year": 2018 }, "OhJhYWBW": { "id": "OhJhYWBW", "title": "Impact of bias-corrected reanalysis-derived lateral boundary conditions on WRF simulations", "abstract": "Lateral and lower boundary conditions derived from a suitable global reanalysis dataset forms the basis for deriving a dynamically consistent finer resolution downscaled product for climate and hydrological assessment studies. A problem with this, however, is that systematic biases have been noted to be present in the global reanalysis datasets that form these boundaries, biases which can be carried into the downscaled simulations thereby reducing their accuracy or efficacy. In this work, three Weather Research and Forecasting (WRF) model downscaling experiments are undertaken to investigate the impact of bias correcting European Centre for Medium range Weather Forecasting Reanalysis ERA-Interim (ERA-I) atmospheric temperature and relative humidity using Atmospheric Infrared Sounder (AIRS) satellite data. The downscaling is performed over a domain centered over southern Africa between the years 2003 and 2012. The sample mean and the mean as well as standard deviation at each grid cell for each variable are used for bias correction. The resultant WRF simulations of near-surface temperature and precipitation are evaluated seasonally and annually against global gridded observational datasets and compared with ERA-I reanalysis driving field. The study reveals inconsistencies between the impact of the bias correction prior to downscaling and the resultant model simulations after downscaling. Mean and standard deviation bias corrected WRF simulations are, however, found to be marginally better than mean only bias corrected WRF simulations and raw ERA-I reanalysis driven WRF simulations. Performances, however, differ when assessing different attributes in the downscaled field. This raises questions about the efficacy of the correction procedures adopted.", "keywords": "", "authors": [ { "name": "D.B. Moalafhi", "org": "Department of Environmental ScienceUniversity of BotswanaGaborone Botswana" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Jason P. Evans", "org": "Climate Change Research CentreUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Eytan Rocheta", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" } ], "venue": "Journal of Advances in Modeling Earth Systems", "year": 2017 }, "xBMTwvJy": { "id": "xBMTwvJy", "title": "Global Sea Surface Temperature Forecasts Using a Pairwise Dynamic Combination Approach", "abstract": "", "keywords": [ "forecasting", "sea surface temperature" ], "authors": [ { "name": "shahadat chowdhury", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Journal of Climate", "year": 2011 }, "jqAMIClz": { "id": "jqAMIClz", "title": "Assessing future rainfall projections using multiple GCMs and a multi-site stochastic downscaling model", "abstract": "", "keywords": [ "climate change" ], "authors": [ { "name": "r c mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "d nagesh kumar", "org": "" }, { "name": "t v reshmidevi", "org": "" } ], "venue": "Journal of Hydrology", "year": 2013 }, "kUcO83uF": { "id": "kUcO83uF", "title": "On the relationship between space-time properties of rainfall and near-surface air temperature at the minute and kilometre scale", "abstract": "", "keywords": "", "authors": [ { "name": "Paolo Burlando", "org": "" }, { "name": "Nadav Peleg", "org": "" }, { "name": "Simone Fatichi", "org": "" }, { "name": "Peter Molnar", "org": "" }, { "name": "E. Morin", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "F. Marra", "org": "" } ], "venue": "The EGU General Assembly", "year": 2019 }, "2fc63yzc": { "id": "2fc63yzc", "title": "Effectiveness of CMIP5 decadal experiments for interannual rainfall prediction over Australia", "abstract": "", "keywords": "", "authors": [ { "name": "Dipayan Choudhury", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, Australia; " }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil & Environmental Engineering, the University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil & Environmental Engineering, the University of New South Wales, Sydney, Australia" }, { "name": "Alexander Sen Gupta", "org": "Climate Change Research Centre, The University of New South Wales, Sydney, Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering , The University of New South Wales , Sydney , Australia " } ], "venue": "Water Resources Research", "year": 2019 }, "KfsfyQ7e": { "id": "KfsfyQ7e", "title": "Utility of Climate Information Based Reservoir Inflow Forecasts in Annual Water Allocation - Ceara Case Study", "abstract": "A dynamic water allocation framework for a multipurpose, single reservoir is formulated to utilize climate information based reservoir inflow forecasts to quantify the reliability of use for the given demand. Based on the semi-parametric approach of De Souza and Lall (2003), 12 months lead retrospective reservoir inflow forecasts were developed for the period July 1990- June 2000 for the Oros reservoir utilizing the climatic conditions available up to June of that year. Based on the actual annual demand to be supplied by the Oros reservoir for the JMH system, the utility of climate forecasts for multipurpose water allocation is assessed utilizing the adaptive forecasts developed for the period 1990-2000. Since Oros reservoir is a multi-year storage reservoir, the initial storage available in July of every year was adequate enough to supply water for all the uses even under zero inflow assumption thereby reducing the utility of climate forecasts during normal inflow years. On the other hand, climate information based reservoir inflow forecasts is more beneficial in meeting the annual demands of the Oros system for different uses during above-normal and below-normal inflow years than during normal inflow years. Analysis of the results suggests that the utility of climate information based reservoir inflow forecasts is more pronounced for systems with high demand to storage ratio.", "keywords": [], "authors": [ { "name": "A. Sankarasubramanian", "org": "International Research|Institute for Climate Prediction|Lamont-Doherty Earth Observatory|Columbia University" }, { "name": "Upmanu Lall", "org": "International Research|Institute for Climate Prediction|Lamont-Doherty Earth Observatory|Columbia University" }, { "name": "Ashish Sharma", "org": "" }, { "name": "João Lucas", "org": "Department of Earth and Environmental Engineering|Columbia University" } ], "venue": "", "year": 2003 }, "qf1Jfzbp": { "id": "qf1Jfzbp", "title": "A nonparametric model for stochastic generation of daily rainfall amounts: SIMULATION OF DAILY RAINFALL AMOUNTS", "abstract": "", "keywords": [], "authors": [ { "name": "timothy i harrold", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "simon j sheather", "org": "" } ], "venue": "Water Resources Research", "year": 2003 }, "daeh9CfN": { "id": "daeh9CfN", "title": "Does improved SSTA prediction ensure better seasonal rainfall forecasts?: BETTER SEASONAL RAINFALL PREDICTION", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Zaved Kaiser Khan", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Rajeshwar Mehrotra", "org": "" }, { "name": "Andrew Schepen", "org": "" }, { "name": "Q. J. Wang", "org": "" } ], "venue": "Water Resources Research", "year": 2015 }, "mHUp3O62": { "id": "mHUp3O62", "title": "Dominant modes of interannual variability in Australian rainfall analyzed using wavelets", "abstract": "One of the key aspects to better managing water resources in Australia is to understand the causes of medium- to long-term rainfall variability, which results in both droughts and periods of above average rainfall and flooding. Much of the research on this variability has focused on the El Niño–Southern Oscillation (ENSO) phenomenon, using methods that assume the relationships between ENSO and Australian rainfall are both linear and stationary. In this paper we present an alternative approach based on wavelets to analyze the dominant modes of variability in three rainfall characteristics: (1) the total annual rainfall, (2) the annual number of wet days, and (3) the maximum annual daily rainfall. We then use a wavelet regression approach to examine the extent of the variability that can be associated with ENSO. The results show that time series of total annual rainfall and annual number of wet days exhibit significant variability at periods of 2.6, 4.6, 7 and 13 years in various locations throughout the country and that these periodicities are not caused directly by the ENSO phenomenon. While maintaining that ENSO still plays a significant role in influencing rainfall variability in Australia, these results highlight the importance of looking beyond ENSO to identify dominant sources of variability in the characteristics of annual Australian rainfall that were studied. In contrast, no coherent modes of variability could be found for the maximum annual daily rainfall time series, highlighting the greater level of random behavior in the intensity of larger rainfall events compared with the long-term averages.", "keywords": [ "enso", "rainfall variability", "wavelets", "time series" ], "authors": [ { "name": "Seth Westra", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Geophysical Research", "year": 2006 }, "tBjS5hkH": { "id": "tBjS5hkH", "title": "Can antecedent moisture conditions modulate the increase in flood risk due to climate change in urban catchments", "abstract": "Abstract Climate change coupled with the current trend in rapid urbanization is increasing the risk of flooding that can cause loss of life and damage to property. Adapting to climate change impacts and flood mitigation has become a life critical factor as well as a severe challenge. Green infrastructure and low impact development methods are common approaches that are increasingly used to address stormwater management in developed environments. The analysis and results of this study show that AMC/IC does impact flood response even in urban developed catchments and that it can significantly impact flood responses during storm events. We show that considering AMC/ICs coupled with changes in seasonal rainfall patterns that are projected for warmer climates in the future can modulate some of the increases in flood risk due to climate change. The prevailing thought is that Antecedent Moisture Conditions (AMCs) have little to no relevance in urban hydrology, particularly in relation to climate change. However, current trends in use of stormwater management methods that depend on local storage and infiltration is increasingly making AMC or Initial Conditions (IC) a factor in urban flooding. Despite this trend there is little available literature that discuss the aspect of AMC/IC that can have an implication on urban flood management. Here, we move towards filling this gap in current literature related to impacts of AMCs in flooding of developed areas by focusing on how possible changes in seasonal rainfall patterns in a warming climate might impact AMC and starting conditions in stormwater Best Management Practices (SWBMPs), and how those changed initial conditions impact flood risk in developed areas. Using a comprehensive hydrologic/hydraulic model of an urban/developed catchment and continuous simulation, we demonstrate the importance of accurately accounting for initial conditions in flood assessments. We consider average summer temperatures based on approximately 70 years of historic data to select warm and cold years. We compare the model results between the warm and cold years as a proxy to look at trends related to a future warming climate.", "keywords": "", "authors": [ { "name": "Suresh Hettiarachchi", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Conrad Wasko", "org": "Department of Infrastructure Engineering, University of Melbourne, Melbourne, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" } ], "venue": "Journal of Hydrology", "year": 2019 }, "aHKXYm29": { "id": "aHKXYm29", "title": "Evaluation of volcanic aerosol impacts on atmospheric water vapor using CMIP3 and CMIP5 simulations", "abstract": "", "keywords": [], "authors": [ { "name": "jingwan li", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" } ], "venue": "Journal of Geophysical Research", "year": 2013 }, "q6eW6eq5": { "id": "q6eW6eq5", "title": "Bayesian Inference in a Hydrological Application of Hierarchical Mixtures of Experts", "abstract": "", "keywords": [ "publishing", "commissioning", "academic research" ], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "", "year": 2003 }, "HqQiOJt9": { "id": "HqQiOJt9", "title": "Correcting for systematic biases in multiple raw GCM variables across a range of timescales", "abstract": "", "keywords": [ "downscaling", "climate change" ], "authors": [ { "name": "rajeshwar mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "NC5AggGY": { "id": "NC5AggGY", "title": "How well do general circulation models represent low‐frequency rainfall variability?", "abstract": "", "keywords": [ "gcm", "persistence", "precipitation" ], "authors": [ { "name": "eytan rocheta", "org": "nust school of civil and environmental engineering" }, { "name": "michael sugiyanto", "org": "nust school of civil and environmental engineering" }, { "name": "fiona johnson", "org": "nust school of civil and environmental engineering" }, { "name": "jason p evans", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2014 }, "E1DbtWfr": { "id": "E1DbtWfr", "title": "A Bayesian alternative for multi-objective ecohydrological model specification", "abstract": "Abstract Recent studies have identified the importance of vegetation processes in terrestrial hydrologic systems. Process-based ecohydrological models combine hydrological, physical, biochemical and ecological processes of the catchments, and as such are generally more complex and parametric than conceptual hydrological models. Thus, appropriate calibration objectives and model uncertainty analysis are essential for ecohydrological modeling. In recent years, Bayesian inference has become one of the most popular tools for quantifying the uncertainties in hydrological modeling with the development of Markov chain Monte Carlo (MCMC) techniques. The Bayesian approach offers an appealing alternative to traditional multi-objective hydrologic model calibrations by defining proper prior distributions that can be considered analogous to the ad-hoc weighting often prescribed in multi-objective calibration. Our study aims to develop appropriate prior distributions and likelihood functions that minimize the model uncertainties and bias within a Bayesian ecohydrological modeling framework based on a traditional Pareto-based model calibration technique. In our study, a Pareto-based multi-objective optimization and a formal Bayesian framework are implemented in a conceptual ecohydrological model that combines a hydrological model (HYMOD) and a modified Bucket Grassland Model (BGM). Simulations focused on one objective (streamflow/LAI) and multiple objectives (streamflow and LAI) with different emphasis defined via the prior distribution of the model error parameters. Results show more reliable outputs for both predicted streamflow and LAI using Bayesian multi-objective calibration with specified prior distributions for error parameters based on results from the Pareto front in the ecohydrological modeling. The methodology implemented here provides insight into the usefulness of multiobjective Bayesian calibration for ecohydrologic systems and the importance of appropriate prior distributions in such approaches.", "keywords": "", "authors": [ { "name": "Yating Tang", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Lucy Marshall", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Hoori Ajami", "org": "Department of Environmental Sciences, University of California Riverside, Riverside, CA, 92521, USA" } ], "venue": "Journal of Hydrology", "year": 2018 }, "DVLsMTZ4": { "id": "DVLsMTZ4", "title": "Does storm duration modulate the extreme precipitation‐temperature scaling relationship?", "abstract": "", "keywords": [ "absolute humidity", "clausius clapeyron" ], "authors": [ { "name": "conrad wasko", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" }, { "name": "fiona johnson", "org": "university of new south wales" } ], "venue": "Geophysical Research Letters", "year": 2015 }, "1PojS7HG": { "id": "1PojS7HG", "title": "Detecting non-stationary hydrologic model parameters in a paired catchment system using data assimilation", "abstract": "Non-stationarity represents one of the major challenges facing hydrologists. There exists a need to develop modelling systems that are capable of accounting for potential catchment changes, in order to provide useful predictions for the future. Such changes may be due to climatic temporal variations or human induced changes to land cover. Extensive research has been undertaken on the impacts of land-use change on hydrologic behaviour, however, few studies have examined this issue in a predictive modelling context. In this paper, we investigate whether a time varying model parameter estimation framework that uses the principles of Data Assimilation can improve prediction for two pairs of experimental catchments in Western Australia. All catchments were initially forested, but after three years one catchment was fully cleared whilst another had only 50% of its area cleared. Their adjacent catchments remained unchanged as a control. Temporal variations in parameters were detected for both treated catchments, with no comparable variations for the control catchments. Improved streamflow prediction and representation of soil moisture dynamics were also seen for the time varying parameter case, compared to when a time invariant parameter set from the calibration period was used. While we use the above mentioned catchments to illustrate the usefulness of the approach, the methods are generic and equally applicable in other settings. This study serves as an important validation step to demonstrate the potential for time varying model structures to improve both predictions and modelling of changing catchments. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.", "keywords": [ "Data assimilation", "Ensemble Kalman filter", "Non-stationarity", "Land use change", "Time varying parameters" ], "authors": [ { "name": "Sahani Pathiraja", "org": "Univ New S Wales, UNSW Water Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Lucy Marshall", "org": "Univ New S Wales, UNSW Water Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "Univ New S Wales, UNSW Water Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Hamid Moradkhani", "org": "Portland State Univ, Dept Civil & Environm Engn, Portland, OR 97207 USA" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2016 }, "x4GILXz2": { "id": "x4GILXz2", "title": "Reconstructing hydro-climatological data using dynamical downscaling of reanalysis products in data-sparse regions – Application to the Limpopo catchment in southern Africa", "abstract": "Abstract This study is conducted over the data-poor Limpopo basin centered over southern Africa using reanalysis downscaled to useful resolution. Reanalysis products are of limited value in hydrological applications due to the coarse spatial scales they are available at. Dynamical downscaling of these products over a domain of interest offers a means to convert them to finer spatial scales in a dynamically consistent manner. Additionally, this downscaling also offers a way to resolve dominantatmospheric processes, leading to improved accuracy in the atmospheric variables derived. This study thus evaluates high-resolution downscaling of an objectively chosen reanalysis (ERA-I) over the Limpopo basin using Weather Research and Forecasting (WRF) as a regional climate model. The model generally under-estimates temperature and over-estimates precipitation over the basin, although reasonably consistent with observations. The model does well in simulating observed sustained hydrological extremes as assessed using the Standardized Precipitation Index (SPI) although it consistently under-estimates the severity ofmoisture deficit for the wettest part of the year during the dry years. The basinu0027s aridity index (I) is above the severe drought threshold during summer and is more severe in autumn. This practically restricts rain-fed agriculture to around 3 months in a year over the basin. This study presents possible beneficial use of the downscaled simulations foroptimal hydrologic design and water resources planning in data scarce parts of the world.", "keywords": "", "authors": [ { "name": "Ditiro B. Moalafhi", "org": "Department of Environmental Science, University of Botswana, Gaborone, Botswana" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia" }, { "name": "Jason P. Evans", "org": "Climate Change Research Centre, University of New South Wales, Sydney, Australia" } ], "venue": "Journal of Hydrology: Regional Studies", "year": 2017 }, "qm5b61UT": { "id": "qm5b61UT", "title": "Hydrologic Modeling in Dynamic Catchments: A Data Assimilation Approach", "abstract": "The transferability of conceptual hydrologic models in time is often limited by both their structural deficiencies and adopted parameterizations. Adopting a stationary set of model parameters ignores biases introduced by the data used to derive them, as well as any future changes to catchment conditions. Although time invariance of model parameters is one of the hallmarks of a high quality hydrologic model, very few (if any) models can achieve this due to their inherent limitations. It is therefore proposed to consider parameters as potentially time varying quantities, which can evolve according to signals in hydrologic observations. In this paper, we investigate the potential for Data Assimilation (DA) to detect known temporal patterns in model parameters from streamflow observations. It is shown that the success of the DA algorithm is strongly dependent on the method used to generate background (or prior) parameter ensembles (also referred to as the parameter evolution model). A range of traditional parameter evolution techniques are considered and found to be problematic when multiple parameters with complex time variations are estimated simultaneously. Two alternative methods are proposed, the first is a Multilayer approach that uses the EnKF to estimate hyperparameters of the temporal structure, based on apriori knowledge of the form of nonstationarity. The second is a Locally Linear approach that uses local linear estimation and requires no assumptions of the form of parameter nonstationarity. Both are shown to provide superior results in a range of synthetic case studies, when compared to traditional parameter evolution techniques.", "keywords": "", "authors": [ { "name": "Sahani Pathiraja", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Lucy Marshall", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Hamid Moradkhani", "org": "Department of Civil and Environmental EngineeringPortland State UniversityPortland Oregon USA" } ], "venue": "Water Resources Research", "year": 2016 }, "W3FsTlQN": { "id": "W3FsTlQN", "title": "Can the variability in precipitation simulations across GCMs be reduced through sensible bias correction?", "abstract": "This work investigates the performance of four bias correction alternatives for representing persistence characteristics of precipitation across 37 General Circulation Models (GCMs) from the CMIP5 data archive. The first three correction approaches are the Simple Monthly Bias Correction (SMBC), Equidistance Quantile Mapping (EQM), and Nested Bias Correction (NBC), all of which operate in the time domain, with a focus on representing distributional and moment attributes in the observed precipitation record. The fourth approach corrects for the biases in high- and low-frequency variability or persistence of the GCM time series in the frequency domain and is named as Frequency-based Bias Correction (FBC). The Climatic Research Unit (CRU) gridded precipitation data covering the global land surface is used as a reference dataset. The assessment focusses on current and future means, variability, and drought-related characteristics at different temporal and spatial scales. For the current climate, all bias correction approaches perform reasonably well at the global scale by reproducing the observed precipitation statistics. For the future climate, focus is drawn on the agreement of the attributes across the GCMs considered. The inter-model difference/spread of each attribute across the GCMs is used as a measure of this agreement. Our results indicate that out of the four bias correction approaches used, FBC provides the lowest inter-model spreads, specifically for persistence attributes, over most regions/ parts over the global land surface. This has significant implications for most hydrological studies where the effect of low-frequency variability is of considerable importance.", "keywords": [ "General circulation models", "Biases in GCM variables", "Empirical quantile mapping", "Nested bias correction", "Frequency-based bias correction", "Agreement across GCM precipitation" ], "authors": [ { "name": "Ha Nguyen", "org": "Water Research Centre, School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" }, { "name": "Rajeshwar Mehrotra", "org": "Water Research Centre, School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" }, { "name": "Ashish Sharma", "org": "Water Research Centre, School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" } ], "venue": "Climate Dynamics", "year": 2017 }, "3zHwPfeu": { "id": "3zHwPfeu", "title": "Merging Alternate Remotely-Sensed Soil Moisture Retrievals Using a Non-Static Model Combination Approach.", "abstract": "Soil moisture is an important variable in the coupled hydrologic and climate system. In recent years, microwave-based soil moisture products have been shown to be a viable alternative to in situ measurements. A popular way to measure the performance of soil moisture products is to calculate the temporal correlation coefficient (R) against in situ measurements or other appropriate reference datasets. In this study, an existing linear combination method improving R was modified to allow for a non-static or nonstationary model combination as the basis for improving remotely-sensed surface soil moisture. Previous research had noted that two soil moisture products retrieved using the Japan Aerospace Exploration Agency (JAXA) and Land Parameter Retrieval Model (LPRM) algorithms from the same Advanced Microwave Scanning Radiometer 2 (AMSR2) sensor are spatially complementary in terms of R against a suitable reference over a fixed period. Accordingly, a linear combination was proposed to maximize R using a set of spatially-varying, but temporally-fixed weights. Even though this approach showed promising results, there was room for further improvements, in particular using non-static or dynamic weights that take account of the time-varying nature of the combination algorithm being approximated. The dynamic weighting was achieved by using a moving window. A number of different window sizes was investigated. The optimal weighting factors were determined for the data lying within the moving window and then used to dynamically combine the two parent products. We show improved performance for the dynamically-combined product over the static linear combination. Generally, shorter time windows outperform the static approach, and a 60-day time window is suggested to be the optimum. Results were validated against in situ measurements collected from 124 stations over different continents. The mean R of the dynamically-combined products was found to be 0.57 and 0.62 for the cases using the European Centre for Medium-Range Weather Forecasts Reanalysis-Interim (ERA-Interim) and Modern-Era Retrospective Analysis for Research and Applications Land (MERRA-Land) reanalysis products as the reference, respectively, outperforming the statically-combined products (0.55 and 0.54).", "keywords": "", "authors": [ { "name": "Seokhyeon Kim", "org": "" }, { "name": "Robert M. Parinussa", "org": "" }, { "name": "Yi Y. Liu", "org": "" }, { "name": "Fiona M. Johnson", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Remote Sensing", "year": 2016 }, "01NmWAkq": { "id": "01NmWAkq", "title": "Impact of bias-corrected reanalysis-derived lateral boundary conditions on WRF simulations: BIAS-CORRECTED REANALYSES-DERIVED LBCS", "abstract": "", "keywords": "", "authors": [ { "name": "D.B. Moalafhi", "org": "Department of Environmental Science; University of Botswana; Gaborone Botswana" }, { "name": "D.B. Moalafhi", "org": "Department of Environmental Science; University of Botswana; Gaborone Botswana" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Jason P. Evans", "org": "Climate Change Research Centre; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Eytan Rocheta", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" } ], "venue": "Journal of Advances in Modeling Earth Systems", "year": 2017 }, "yCCZMaNb": { "id": "yCCZMaNb", "title": "Estimating the design flood for ungauged catchments in a nonstationary world", "abstract": "", "keywords": [ "point location", "continuous simulation" ], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "sabrina westra", "org": "" }, { "name": "rajiv mehrotra", "org": "" } ], "venue": "", "year": 2010 }, "v8laKICx": { "id": "v8laKICx", "title": "Adaptation Strategies in Coping with Climate Change Impacts for Improved Crop Health and Sustainable Food Production", "abstract": "\n In this chapter, historical climate information on rainfall, evaporation and temperature is compared with projections of these\n variables using outputs from the CSIRO Mk3 GCM for the A1B SRES scenario and stochastic downscaling models for two selected\n locations in Australia. The differences between current climatic parameters and those for 2030 and 2070 provide information\n on the changes in dependability of crop growing seasons. These analyses could also be used in identifying suitable strategies\n for adaptation to the projected climate change, and for evaluating alternate management options relating to excess and insufficient\n water during the growing season. These findings also have implications in resource management for mitigation purposes (e.g.\n the role of crop models in screening environments for growing of carbon sinks). The issue of the response of pests and diseases,\n and their interaction with host crops, to climate change is also considered. Information is required on the seasonal and geographic\n distributions of the occurrence and severity of pests and diseases for future climatic situations. We also report on current\n research aiming to integrate pathogen, crop and weather information for making tactical crop management decisions.\n \n \n Even though the study uses Australian data as a case study to test and validate the methodologies presented, it provides a\n generic framework and research directions which can easily be applied to other parts of the world including South Asia. Implications\n of research findings to South Asia and future research directions are also discussed.\n \n \n ", "keywords": [], "authors": [ { "name": "Abul Kalam Samsul Huda", "org": "School of Natural Sciences, University of Western Sydney, Hawkesbury, Locked Bag 1797, Penrith South DC, NSW 1797, Australia" }, { "name": "Raj Mehrotra", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, 2052 Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, 2052 Australia" } ], "venue": "", "year": 2010 }, "optnJYua": { "id": "optnJYua", "title": "A nonparametric model for stochastic generation of daily rainfall occurrence", "abstract": "This paper presents a nonparametric model for generating single-site daily rainfall occurrence. The model is formulated to reproduce longer-term variability and low-frequency features such as drought and sustained wet periods, while still reproducing characteristics at daily time scales. Parsimony is achieved within a Markovian framework by using “aggregate” predictor variables that describe how wet it has been over a period of time. The use of a moving window to give a seasonally representative sample at any given time of year ensures an accurate representation of the seasonal variations present in the rainfall time series. Actual simulation proceeds by resampling from the historical record of rainfall occurrence, conditional to the current values of the associated predictors. The model is applied using historical daily rainfall occurrence from Sydney, Australia. We find that the use of multiple predictors specified at a daily level and at seasonal, annual, and multiyear aggregation levels leads to sequences that more closely reproduce the longer-term variability present in the historic records, compared to sequences produced by models incorporating only one or two predictors.", "keywords": [ "nonparametric", "rainfall", "stochastic", "low frequency", "stochastic process", "seasonality", "time series", "seasonal variation" ], "authors": [ { "name": "timothy i harrold", "org": "" }, { "name": "ashish sharma", "org": "university of new south wales" }, { "name": "simon j sheather", "org": "university of new south wales" } ], "venue": "Water Resources Research", "year": 2003 }, "7vzZvKIm": { "id": "7vzZvKIm", "title": "Preserving low-frequency variability in generated daily rainfall sequences", "abstract": "A stochastic modeling framework for multisite generation of daily rainfall is developed with an aim of representing both short and higher time scale dependence in the generated rainfall sequences. The framework simulates rainfall at individual locations using separate models for rainfall occurrences and rainfall amounts on the simulated wet days. The spatial correlations in the generated occurrences and amounts are induced using spatially correlated yet serially independent random numbers. The rainfall occurrence model is based on a modification of the transition probabilities of the traditional Markov model through an analytically derived factor that represents the influence of rainfall aggregated over long time periods in an attempt to incorporate low-frequency variability in simulations. The rainfall amounts on the wet days are generated using a nonparametric conditional simulation approach. The utility of the proposed method is illustrated by applying the model on a network of 30 raingauge stations around Sydney, Australia, and comparing a range of statistics describing daily and higher time scale distribution and dependence attributes. The analyses of the results show that the method adequately captures daily as well as aggregated higher time scale rainfall characteristics at individual locations including the spatial distribution of rainfall over the region.", "keywords": [ "low-frequency rainfall characteristics", "stochastic weather generator", "kernel density estimation", "rainfall", "spatial correlation structure", "aggregated time scale rainfall characteristics", "markov chain", "transition probability", "low frequency", "kernel density estimate", "markov model", "spatial correlation", "stochastic model" ], "authors": [ { "name": "R. Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "The University of New South Wales, Sydney, Australia" } ], "venue": "Journal of Hydrology", "year": 2007 }, "RdBxaJ5s": { "id": "RdBxaJ5s", "title": "Increases in temperature do not translate to increased flooding.", "abstract": "", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "Department of Environmental Sciences, University of California, Riverside,Riverside,USA" }, { "name": "Ashish Sharma", "org": "Civil and Environmental Engineering, The University of New South Wales, Sydney, Australia" }, { "name": "Dennis P. Lettenmaier", "org": "Department of Geography, University of California–Los Angeles, Los Angeles, USA" } ], "venue": "Nature Communications", "year": 2019 }, "diFFY38Y": { "id": "diFFY38Y", "title": "Changes to rainfall spatial properties at warmer temperatures observed from weather radar data", "abstract": "", "keywords": "", "authors": [ { "name": "Nadav Peleg", "org": "" }, { "name": "F. Marra", "org": "" }, { "name": "Simone Fatichi", "org": "" }, { "name": "Peter Molnar", "org": "" }, { "name": "E. Morin", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Paolo Burlando", "org": "" } ], "venue": "The EGU General Assembly", "year": 2019 }, "ACO6auSI": { "id": "ACO6auSI", "title": "Closure of \"Comparison of Two Nonparametric Alternatives for Stochastic Generation of Monthly Rainfall\"", "abstract": "", "keywords": [ "hydrology", "stochastic processes", "streamflow" ], "authors": [ { "name": "r srikanthan", "org": "" }, { "name": "a k sharma", "org": "" }, { "name": "t a mcmahon", "org": "" } ], "venue": "Journal of Hydrologic Engineering", "year": 2007 }, "HCThciA8": { "id": "HCThciA8", "title": "Dynamic Model Mixing for Enhancing the Predictability of Hydroclimatic Variables", "abstract": "", "keywords": [ "dynamic combination", "hierarchical tree extended abstract", "sea surface temperature" ], "authors": [ { "name": "Shahadat Chowdhury", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "", "year": 0 }, "i6jk0qnv": { "id": "i6jk0qnv", "title": "Data‐Driven Model Uncertainty Estimation in Hydrologic Data Assimilation", "abstract": "", "keywords": "", "authors": [ { "name": "S. Pathiraja", "org": "Institut für MathematikUniversität PotsdamPotsdam Germany" }, { "name": "H. Moradkhani", "org": "Department of Civil and Environmental EngineeringPortland State UniversityPortland OR USA" }, { "name": "L. Marshall", "org": "Water Research Centre, School of Civil and Environmental EngineeringUniversity of New South WalesSydney NSW Australia" }, { "name": "A. Sharma", "org": "Water Research Centre, School of Civil and Environmental EngineeringUniversity of New South WalesSydney NSW Australia" }, { "name": "G. Geenens", "org": "School of Mathematics and StatisticsUniversity of New South WalesSydney NSW Australia" } ], "venue": "Water Resources Research", "year": 2018 }, "lVf6naPu": { "id": "lVf6naPu", "title": "Efficient hydrological model parameter optimization with Sequential Monte Carlo sampling.", "abstract": "Bayesian inference provides an ideal platform for assessing parameter uncertainty for complex physical models, such as conceptual hydrological models. Sequential Monte Carlo (SMC) samplers are well suited for its implementation as they are effective in sampling from posterior distributions with the non-linear dependency structures and multiple modes often present in hydrological models. A challenge in implementing SMC samplers is in the construction of a suitable sequence of intermediary distributions leading to the posterior distribution, in such a way that the sampler performs both efficiently in that minimal computation is needed, and robustly in that the samplers particle population is effectively maintained. In this article we demonstrate that naive implementation of an SMC sampler in a hydrological model can cause the sampler to collapse. To address this, we propose a new method of dynamically constructing the transition path between the intermediary distributions that effectively increases the amount of computation at the point where it is needed to avoid this collapse. We analyse the performance of our approach through the analysis of real and simulated hydrological data, and discuss related SMC sampler implementation issues. In addition we consider the question of the appropriate number of particles in the sampler as the dimensionality of the model increases.", "keywords": [ "naive implementation", "smc sampler", "smc sampler implementation issue", "conceptual hydrological model", "complex physical model", "intermediary distribution", "samplers particle population", "simulated hydrological data", "posterior distribution", "efficient hydrological model parameter", "sequential monte carlo sampling", "hydrological model", "monte carlo", "bayesian", "data assimilation" ], "authors": [ { "name": "Erwin Jeremiah", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Scott A. Sisson", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Lucy Marshall", "org": "Land Resources and Environmental Science, Montana State University, Bozeman, Montana, United States" } ], "venue": "Environmental Modelling and Software", "year": 2012 }, "KjMtSjja": { "id": "KjMtSjja", "title": "A Bayesian method for multi-pollution source water quality model and seasonal water quality management in river segments.", "abstract": "", "keywords": [ "bayesian" ], "authors": [ { "name": "Ying Zhao", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Bellie Sivakumar", "org": "" }, { "name": "Lucy Marshall", "org": "" }, { "name": "Peng Wang", "org": "" }, { "name": "Jiping Jiang", "org": "" } ], "venue": "Environmental Modelling and Software", "year": 2014 }, "GO5Akqjw": { "id": "GO5Akqjw", "title": "Evaluating the effect of climate change on areal reduction factors using regional climate model projections", "abstract": "", "keywords": [ "gev distribution" ], "authors": [ { "name": "jingwan li", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "fiona johnson", "org": "" }, { "name": "jason p evans", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "BMsVjF2E": { "id": "BMsVjF2E", "title": "An Objective Multiattribute Analysis Approach for Allocation of Scarce Irrigation Water Resources", "abstract": "", "keywords": [ "conjoint analysis", "electre" ], "authors": [ { "name": "Noor ul Hassan Zardari", "org": "" }, { "name": "Ian Cordery", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of The American Water Resources Association", "year": 2010 }, "aDeJtOnF": { "id": "aDeJtOnF", "title": "Streamflow simulation: A nonparametric approach", "abstract": "In this paper kernel estimates of the joint and conditional probability density functions are used to generate synthetic streamflow sequences. Streamflow is assumed to be a Markov process with time dependence characterized by a multivariate probability density function. Kernel methods are used to estimate this multivariate density function. Simulation proceeds by sequentially resampling from the conditional density function derived from the kernel estimate of the underlying multivariate probability density function. This is a nonparametric method for the synthesis of streamflow that is data- driven and avoids prior assumptions as to the form of dependence (e.g., linear or nonlinear) and the form of the probability density functions (e.g., Gaussian). We show, using synthetic examples with known underlying models, that the nonparametric method presented is moreflexible than the conventional models used in stochastic hydrology and is capable of reproducing both linear and nonlinear dependence. The effectiveness of this model is illustrated through its application to simulation of monthly streamflow from the Beaver River in Utah.", "keywords": [ "beaver river in utah.", "conditional probability", "stochastic process", "markov process", "kernel method", "probability density function" ], "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "David G. Tarboton", "org": "" }, { "name": "Upmanu Lall", "org": "" } ], "venue": "Water Resources Research", "year": 1997 }, "QS3lfjAg": { "id": "QS3lfjAg", "title": "An improved standardization procedure to remove systematic low frequency variability biases in GCM simulations", "abstract": "", "keywords": [ "climate change", "downscaling" ], "authors": [ { "name": "rajeshwar mehrotra", "org": "nust school of civil and environmental engineering" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2012 }, "GP5hV5Tc": { "id": "GP5hV5Tc", "title": "Steeper temporal distribution of rain intensity at higher temperatures within Australian storms", "abstract": "", "keywords": [ "hydrology" ], "authors": [ { "name": "conrad wasko", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Nature Geoscience", "year": 2015 }, "fGGHxZlX": { "id": "fGGHxZlX", "title": "A simulation based approach for representation of rainfall uncertainty in conceptual rainfall runoff models", "abstract": "", "keywords": [], "authors": [ { "name": "Shahadat Chowdhury", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Hydrological Research Letters", "year": 2008 }, "9h1IKdB6": { "id": "9h1IKdB6", "title": "A framework to quantify GCM uncertainties for use in impact assessment studies", "abstract": "", "keywords": [ "climate change" ], "authors": [ { "name": "f m woldemeskel", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "b sivakumar", "org": "" }, { "name": "r c mehrotra", "org": "" } ], "venue": "Journal of Hydrology", "year": 2014 }, "N8zq667C": { "id": "N8zq667C", "title": "A Bayesian view of rainfall-runoff modelling: alternatives for parameter estimation, model comparison and hierarchical model development.", "abstract": "", "keywords": [ "uncertainty", "runoff", "markov processes", "estimation", "bayesian theory", "simulation models", "monte carlo method", "catchment hydrology", "stream flow" ], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "david j nott", "org": "" }, { "name": "stewart w franks", "org": "" }, { "name": "murugesu sivapalan", "org": "" }, { "name": "kiyoshi takeuchi", "org": "" }, { "name": "y tachikawa", "org": "" } ], "venue": "", "year": 2005 }, "X5tfy0iq": { "id": "X5tfy0iq", "title": "A global assessment of the timing of extreme rainfall from TRMM and GPM for improving hydrologic design", "abstract": "The tropical rainfall measuring mission (TRMM) has revolutionized the measurement of precipitation worldwide. However, TRMM significantly underestimates rainfall in deep convection systems, being therefore of little help for the analysis of extreme precipitation depths. This work evaluates the ability of both TRMM and the recently launched global precipitation measurement (GPM) mission to help in the identification of the timing of severe rainfall events. We compare the date of occurrence of the most severe daily rainfall recorded each year by a global rain gauge network with the ones estimated by TRMM. The match rate between the two is found to approach 50%, indicating significant consistency between the two data sources. This figure rises to 60% for GPM, indicating the potential for this new mission to improve the accuracy associated with TRMM. Further efforts are needed in improving the GPM conversion algorithms in order to reduce the bias affecting the estimation of intense depths. The results however show that the timing estimated from GPM can provide a solid basis for an extensive characterization of the spatio-temporal distribution of extreme rainfall in poorly gauged regions of the world.", "keywords": "", "authors": [ { "name": "Andrea Libertino", "org": "Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino I-10129, Italy" }, { "name": "Andrea Libertino", "org": "Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino I-10129, Italy" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Venkat Lakshmi", "org": "Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC 29208, USA" }, { "name": "Pierluigi Claps", "org": "Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino I-10129, Italy" } ], "venue": "Environmental Research Letters", "year": 2016 }, "gprpUbF9": { "id": "gprpUbF9", "title": "On the divergence of potential and actual evapotranspiration trends: An assessment across alternate global datasets", "abstract": "Evapotranspiration is a key variable in hydrology, playing an important role in water and energy balance of the land surface. There has been speculation on the direction of trend in potential and actual evapotranspiration (PET and AET) resulting from rising global temperatures, in both observational and derived records representing the historical climate. In this study, PET and AET trends of 8 different global model datasets where analyzed over two time periods: from 2003 to 2012 (short term) and from 1980 to 2012 (multi-decadal), to identify regions where the trends coincide or differ and to study the reasons behind these changes. The short-term analysis showed considerable uncertainty exists on the detection and direction of significant trends on both PET and AET. There was little agreement amongst the datasets about the direction of the global trends. The multi-decadal study showed much more consistent trends throughout the datasets, particularly in relation to positive significant PET trends. During this period, the global PET mean increased 0.091mm/month/year, while the global AET rose at 0.045 mm/month/year. Much of the opposite PET/AET trends can be attributed to changes in the precipitation. Most of the regions which present these trends are water-limited and present strong correlations between AET and precipitation trends. Some energy-limited regions showed an increasing gap between PET and AET, suggesting the influence of additional variables controlling AET.", "keywords": "", "authors": [ { "name": "Alfonso Anabalón", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" } ], "venue": "Earth’s Future", "year": 2017 }, "UgnbpaK7": { "id": "UgnbpaK7", "title": "Ecohydrologic error models for improved Bayesian inference in remotely sensed catchments", "abstract": "", "keywords": "", "authors": [ { "name": "Yating Tang", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales Sydney NSW Australia" }, { "name": "Lucy Marshall", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales Sydney NSW Australia" }, { "name": "Ashish Sharma", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales Sydney NSW Australia" }, { "name": "Hoori Ajami", "org": "Department of Environmental SciencesUniversity of California Riverside Riverside California USA" }, { "name": "David J. Nott", "org": "Department of Statistics and Applied ProbabilityNational University of Singapore Singapore Singapore" } ], "venue": "Water Resources Research", "year": 2019 }, "BbHDNOXy": { "id": "BbHDNOXy", "title": "Modelling precipitation uncertainties in a multi-objective Bayesian ecohydrological setting", "abstract": "Recent studies have demonstrated that hydrological model calibrations are impaired by uncertainties in observations and model structures. For a rainfall-driven model, the error in precipitation observations can lead to biased parameter estimates and predictions. For a conceptual ecohydrological model, an appropriate description of input error is essential because rainfall controls both hydrological processes and vegetation growth in the model. However, to date the impact of precipitation uncertainty on ecohydrologic model parameters and outputs has not been widely explored (Fuentes et al., 2006; Shields and Tague, 2012). The increased dimensionality of these types of models and the uncertainties associated with calibration data can make traditional approaches for characterizing precipitation errors problematic. Our study aims to investigate the impact of precipitation uncertainty for a Bayesian multi-objective calibration approach in an ecohydrological modeling study. A conceptual model that combines a hydrologic model and a modified bucket grassland model is implemented for a forested catchment in Australia. In the study, different input error descriptions are used in both single and multi-objective Bayesian calibration case studies aimed at simulating streamflow and Leaf Area Index (LAI). The emphasis on each objective is represented as different prior distributions defined for error parameters for multi-objective cases. Results show better parameter estimates and predictions for the cases including input error. Comparing the results from the cases in which different input error descriptions are used, a simple bias term works well for both streamflow and LAI estimations. Although a more complex rainfall multiplier approach to represent input error performs best for streamflow predictions, increasing the dimensionality of the input error model is not always justified given the information content of the data. In addition, some of the rainfall multipliers values are not meaningful in the real case, reflecting an overfitting problem.", "keywords": [ "Ecohydrological modeling", "Bayesian inference", "Input error", "Multi-objective calibration", "Uncertainty analysis" ], "authors": [ { "name": "Yating Tang", "org": "Univ New South Wales, Sch Civil & Environm Engn, UNSW Water Res Ctr, Sydney, NSW 2052, Australia" }, { "name": "Lucy Marshall", "org": "Univ New South Wales, Sch Civil & Environm Engn, UNSW Water Res Ctr, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, UNSW Water Res Ctr, Sydney, NSW 2052, Australia" }, { "name": "Hoori Ajami", "org": "Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2018 }, "A4ewLKFa": { "id": "A4ewLKFa", "title": "Preliminary Analysis of Trends in Australian Flood Data", "abstract": "", "keywords": [], "authors": [ { "name": "george kuczera", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sjirk j westra", "org": "" }, { "name": "ataur rahman", "org": "" }, { "name": "elias h ishak", "org": "" } ], "venue": "", "year": 2012 }, "bR4DkxH4": { "id": "bR4DkxH4", "title": "Does storm duration modulate the extreme precipitation-temperature scaling relationship?: EFFECT OF STORM DURATION ON SCALING", "abstract": "", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Fiona Johnson", "org": "" } ], "venue": "Geophysical Research Letters", "year": 2015 }, "5MH12MkO": { "id": "5MH12MkO", "title": "Specifying a hierarchical mixture of experts for hydrologic modeling: Gating function variable selection", "abstract": "", "keywords": [ "bayesian" ], "authors": [ { "name": "erwin jeremiah", "org": "university of new south wales" }, { "name": "lucy marshall", "org": "montana state university" }, { "name": "scott a sisson", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" } ], "venue": "Water Resources Research", "year": 2013 }, "KOb96XLU": { "id": "KOb96XLU", "title": "Future aridity under conditions of global climate change", "abstract": "Abstract Global climate change is anticipated to cause some major changes in hydroclimatic conditions around the world. As aridity is a reliable indicator of potential available water, assessment of its changes under future climatic conditions is important for proper management of water. This study employs the UNESCO aridity/humidity index, which is a derivative of precipitation (P) and potential evapotranspiration (PET), for assessment of aridity. Historical (1901–2005) simulations and future (2006–2100) projections of 22 global climate models (GCMs) from the fifth phase of the Coupled Model Intercomparison Project (CMIP5) are studied. The Nested Bias Correction (NBC) approach is used to correct possible biases of precipitation (simulated directly by the GCMs) and PET (estimated by applying FAO56-Penman-Monteith model on simulated parameters of the GCMs). To detect future aridity changes, the areal extents of the aridity zones in the past and future periods as well as through four sub-periods (2006–2025, 2026–2050, 2051–2075, and 2076–2100) of the future are compared. The results indicate that changes in climate will alter the areal extents of aridity zones in the future. In general, from the first sub-period towards the last one, the area covered by hyper-arid, arid, semi-arid, and sub-humid zones will increase (by 7.46%, 7.01%, 5.80%, and 2.78%, respectively), while the area of the humid regions will decrease (by 4.76%), suggesting that there will be less water over the global land area in the future. To understand the cause of these changes, precipitation and PET are also separately assumed to be stationary throughout the four future sub-periods and the resulting aridity changes are then analyzed. The results reveal that the aridity changes are mostly caused by the positive PET trends, even though the slight precipitation increase lessens the magnitude of the changes.", "keywords": "", "authors": [ { "name": "Mohammad Amin Asadi Zarch", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Mohammad Amin Asadi Zarch", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Hossein Malekinezhad", "org": "Faculty of Natural Resources, Yazd University, Yazd, Iran" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2017 }, "glEPOnce": { "id": "glEPOnce", "title": "Quantification of precipitation and temperature uncertainties simulated by CMIP3 and CMIP5 models: Comparison of CMIP3 and CMIP5 Uncertainty", "abstract": "", "keywords": "", "authors": [ { "name": "Fitsum Woldemeskel", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "R. Mehrotra", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" } ], "venue": "Journal of Geophysical Research", "year": 2016 }, "h9Z5m4gw": { "id": "h9Z5m4gw", "title": "Atmospheric Moisture Measurements Explain Increases in Tropical Rainfall Extremes", "abstract": "", "keywords": "", "authors": [ { "name": "Thomas P. Roderick", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Conrad Wasko", "org": "Department of Infrastructure Engineering University of Melbourne Melbourne Victoria Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" } ], "venue": "Geophysical Research Letters", "year": 2019 }, "LSGy3SfS": { "id": "LSGy3SfS", "title": "An information theoretic alternative to model a natural system using observational information alone", "abstract": "", "keywords": [ "mutual information", "information theory" ], "authors": [ { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" }, { "name": "raj n mehrotra", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2014 }, "eNzoYiMG": { "id": "eNzoYiMG", "title": "Evaluating global reanalysis datasets for provision of boundary conditions in regional climate modelling", "abstract": "Regional climate modelling studies often begin by downscaling a reanalysis dataset in order to simulate the observed climate, allowing the investigation of regional climate processes and quantification of the errors associated with the regional model. To date choice of reanalysis to perform such downscaling has been made based either on convenience or on performance of the reanalyses within the regional domain for relevant variables such as near-surface air temperature and precipitation. However, the only information passed from the reanalysis to the regional model are the atmospheric temperature, moisture and winds at the location of the boundaries of the regional domain. Here we present a methodology to evaluate reanalyses derived lateral boundary conditions for an example domain over southern Africa using satellite data. This study focusses on atmospheric temperature and moisture which are easily available. Five commonly used global reanalyses (NCEP1, NCEP2, ERA-I, 20CRv2, and MERRA) are evaluated against the Atmospheric Infrared Sounder satellite temperature and relative humidity over boundaries of two domains centred on southern Africa for the years 2003–2012 inclusive. The study reveals that MERRA is the most suitable for climate mean with NCEP1 the next most suitable. For climate variability, ERA-I is the best followed by MERRA. Overall, MERRA is preferred for generating lateral boundary conditions for this domain, followed by ERA-I. While a “better” LBC specification is not the sole precursor to an improved downscaling outcome, any reduction in uncertainty associated with the specification of LBCs is a step in the right direction.", "keywords": [ "Reanalyses", "AIRS", "Lateral boundary conditions", "RCM", "Southern Africa" ], "authors": [ { "name": "Ditiro B. Moalafhi", "org": "School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" }, { "name": "Jason P. Evans", "org": "Climate Change Research Centre,The University of New South Wales,Sydney,Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" } ], "venue": "Climate Dynamics", "year": 2016 }, "CcOkShYf": { "id": "CcOkShYf", "title": "Correcting systematic biases across multiple atmospheric variables in the frequency domain", "abstract": "A procedure for correcting systematic biases across multiple variables is presented. This procedure operates in the frequency domain, using the cross-spectrum across variables to correct bias across each frequency band. The proposed approach is termed multivariate frequency bias correction or MFBC. The approach is illustrated using global climate model (GCM) simulations of multiple atmospheric variables, with variables selected based on recommended usage in downscaling applications. Results indicate clear benefits of using MFBC in representing both intra- and inter-variable dependence in corrected simulations. This has important implications in applications which require multiple atmospheric variables, and a need to correctly simulate both inter- and intra-variable dependence attributes. MFBC offers a mean to correct raw GCM atmospheric variables prior to downscaling or correct dynamically or statistically downscaled simulations prior to derived simulations of other variables of interest. Use of MFBC can have significant implications on derived hydrologic simulations, such as in sizing of storage reservoirs, or devising water sharing plans for the future.", "keywords": [ "Bias correction", "Downscaling", "Multivariate bias correction", "Frequency bias correction", "Multivariate frequency bias correction" ], "authors": [ { "name": "Ha Nguyen", "org": "Water Research Centre, School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" }, { "name": "Rajeshwar Mehrotra", "org": "Water Research Centre, School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" }, { "name": "Ashish Sharma", "org": "Water Research Centre, School of Civil and Environmental Engineering,The University of New South Wales,Sydney,Australia" } ], "venue": "Climate Dynamics", "year": 2018 }, "Cgo6haue": { "id": "Cgo6haue", "title": "Specifying a hierarchical mixture of experts for hydrologic modeling: Gating function variable selection: Specifying A Hierarchical Mixture of Experts", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "erwin jeremiah", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "scott a sisson", "org": "" } ], "venue": "Water Resources Research", "year": 2013 }, "mWtC7Ttd": { "id": "mWtC7Ttd", "title": "Partial Information And Partial Weight - Two New Information Theoretic Metrics To Help Specify A Data-Based Natural System Model", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "rajeshwar mehrotra", "org": "" } ], "venue": "", "year": 2014 }, "EMbxZoZI": { "id": "EMbxZoZI", "title": "How well do general circulation models represent low-frequency rainfall variability?: GCM LOW-FREQUENCY RAINFALL VARIABILITY", "abstract": "", "keywords": [], "authors": [ { "name": "fiona johnson", "org": "" }, { "name": "jason p evans", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "eytan rocheta", "org": "" }, { "name": "michael sugiyanto", "org": "" } ], "venue": "Water Resources Research", "year": 2014 }, "EN3Knlwh": { "id": "EN3Knlwh", "title": "Interpreting variability in global SST data using independent component analysis and principal component analysis", "abstract": "", "keywords": [ "varimax", "sea surface temperature", "principal component analysis", "independent component analysis" ], "authors": [ { "name": "Seth Westra", "org": "" }, { "name": "Casey Brown", "org": "" }, { "name": "Upmanu Lall", "org": "" }, { "name": "Inge Koch", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "International Journal of Climatology", "year": 2009 }, "e03azd7B": { "id": "e03azd7B", "title": "Refining predictor spectral representation using wavelet theory for improved natural system modelling", "abstract": "", "keywords": "", "authors": [ { "name": "Ze Jiang", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney, New South Wales; Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney, New South Wales; Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney, New South Wales; Australia" } ], "venue": "Water Resources Research", "year": 2020 }, "snB9VQbT": { "id": "snB9VQbT", "title": "Building a Flood-Warning Framework for Ungauged Locations Using Low Resolution, Open-Access Remotely Sensed Surface Soil Moisture, Precipitation, Soil, and Topographic Information.", "abstract": "Soil moisture (SM) plays an important role in determining the antecedent condition of a watershed, while topographic attributes define how and where SM and rainfall interact to create floods. Based on this principle, we present a method to identify flood risk at a location in a watershed by using remotely sensed SM and open-access information on rainfall, soil properties, and topography. The metho...", "keywords": [ "Data models", "Remote sensing", "Mathematical model", "Optimization", "Soil moisture", "Moisture" ], "authors": [ { "name": "Seokhyeon Kim", "org": "Sydney, NSW, Australia" }, { "name": "Kyungrock Paik", "org": "Seoul, South Korea" }, { "name": "Fiona M. Johnson", "org": "Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "Sydney, NSW, Australia" } ], "venue": "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing", "year": 2018 }, "0jtFGzQ9": { "id": "0jtFGzQ9", "title": "Correcting for low-frequency variability bias in GCM rainfall simulations", "abstract": "", "keywords": [ "low frequency" ], "authors": [ { "name": "frances l johnson", "org": "" }, { "name": "rajiv mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2010 }, "GYLdgKuV": { "id": "GYLdgKuV", "title": "Representing low-frequency variability in continuous rainfall simulations: A hierarchical random Bartlett Lewis continuous rainfall generation model: A HIERARCHICAL RANDOM BARTLETT LEWIS MODEL", "abstract": "", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney NSW Australia" }, { "name": "Alexander Pui", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney NSW Australia" }, { "name": "Alexander Pui", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney NSW Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney NSW Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney NSW Australia" }, { "name": "Erwin Jeremiah", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney NSW Australia" } ], "venue": "Water Resources Research", "year": 2015 }, "OEKH9lHQ": { "id": "OEKH9lHQ", "title": "An improved standardization procedure to remove systematic low frequency variability biases in GCM simulations: TECHNICAL NOTE", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "rajeshwar mehrotra", "org": "" } ], "venue": "Water Resources Research", "year": 2012 }, "EWMLuUkV": { "id": "EWMLuUkV", "title": "Effect of radar beam geometry on radar rainfall estimation", "abstract": "", "keywords": "", "authors": [ { "name": "Siriluk Chumchean", "org": "" }, { "name": "Alan Seed", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "IAHS-AISH publication", "year": 2003 }, "sg4Fyf1H": { "id": "sg4Fyf1H", "title": "Characterizing Drought Using the Reliability-Resilience-Vulnerability Concept", "abstract": "This study borrows the measures developed for the operation of water resources systems as a means of characterizing droughts in a given region. It is argued that the common approach of assessing drought using a univariate measure (severity or reliability) is inadequate as decision makers need assessment of the other facets considered here. It is proposed that the joint distribution of reliability, resilience, and vulnerability (referred to as RRV in a reservoir operation context), assessed using soil moisture data over the study region, be used to characterize droughts. Use is made of copulas to quantify the joint distribution between these variables. As reliability and resilience vary in a nonlinear but almost deterministic way, the joint probability distribution of only resilience and vulnerability is modeled. Recognizing the negative association between the two variables, a Plackett copula is used to formulate the joint distribution. The developed drought index, referred to as the drought management index (DMI), is able to differentiate the drought proneness of a given area when compared to other areas. An assessment of the sensitivity of the DMI to the length of the data segments used in evaluation indicates relative stability is achieved if the data segments are 5 years or longer. The proposed approach is illustrated with reference to the Malaprabha River basin in India, using four adjoining Climate Prediction Center grid cells of soil moisture data that cover an area of approximately .
", "keywords": [ "resilience", "reliability", "water resources", "copula", "vulnerability" ], "authors": [ { "name": "rajib maity", "org": "Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India (corresponding author)." }, { "name": "ashish sharma", "org": "School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia." }, { "name": "d nagesh kumar", "org": "Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India." }, { "name": "kironmala chanda", "org": "Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India." } ], "venue": "Journal of Hydrologic Engineering", "year": 2012 }, "3II528vm": { "id": "3II528vm", "title": "Coping with model structural uncertainty in medium-term hydro-climatic forecasting", "abstract": "", "keywords": [ "streamflow", "rainfall", "probabilistic forecasting" ], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "s chowdhury", "org": "" } ], "venue": "Hydrology Research", "year": 2011 }, "MzB8dTKh": { "id": "MzB8dTKh", "title": "Multisite seasonal forecast of arid river flows using a dynamic model combination approach", "abstract": "This paper dynamically combines three independent forecasts of multiple river flow volumes a season in advance for arid catchments. The case study considers five inflow locations in the upper Namoi Catchment of eastern Australia. The seasonal flows are predicted on the basis of concurrent sea surface temperature anomalies (SSTAs), which are predicted a season forward using a dynamic combination of three SSTA forecasts. The river flows are predicted using three statistical forecasting models: (1) a mixture of generalized lognormal and multinomial logit models, (2) the local regression of independent components of five inflows, and (3) the weighted nearest neighbor method, where each of these models use the forecasted SSTA along with prior lags of the flow as the main driving variables. The study demonstrates that improved SSTA forecast (due to dynamic combination) in turn improves all three flow forecasts, while the dynamic combination of the three flow forecasts results in further, although smaller, improvements.", "keywords": [ "forecast", "namoi", "dynamic combination", "flow", "seasonality", "multinomial logit model", "mathematical models", "time series analysis", "meteorology", "water resources", "temperature", "catchment hydrology", "surfaces", "forecasting", "nearest neighbor method" ], "authors": [ { "name": "Shahadat Chowdhury", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2009 }, "JcBmUnI3": { "id": "JcBmUnI3", "title": "Assessing the extent of non-stationary biases in GCMs", "abstract": "Abstract General circulation models (GCMs) are the main tools for estimating changes in the climate for the future. The imperfect representation of climate models introduces biases in the simulations that need to be corrected prior to their use for impact assessments. Bias correction methods generally assume that the bias calculated over the historical period does not change and can be applied to the future. This study investigates this assumption by considering the extent and nature of bias non-stationarity using 20th century precipitation and temperature simulations from six CMIP5 GCMs across Australia. Four statistics (mean, standard deviation, 10th and 90th quantiles) in monthly and seasonal biases are obtained for three different time window lengths (10, 25 and 33 years) to examine the properties of bias over time. This approach is repeated for two different phases of the Interdecadal Pacific Oscillation (IPO), which is known to have strong influences on the Australian climate. It is found that bias non-stationarity at decadal timescales is indeed an issue over some of Australia for some GCMs. When considering interdecadal variability there are significant difference in the bias between positive and negative phases of the IPO. Regional analyses confirmed these findings with the largest differences seen on the east coast of Australia, where IPO impacts tend to be the strongest. The nature of the bias non-stationarity found in this study suggests that it will be difficult to modify existing bias correction approaches to account for non-stationary biases. A more practical approach for impact assessments that use bias correction maybe to use a selection of GCMs where the assumption of bias non-stationarity holds.", "keywords": "", "authors": [ { "name": "Jannatun Nahar", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" } ], "venue": "Journal of Hydrology", "year": 2017 }, "iXVBEcR3": { "id": "iXVBEcR3", "title": "Comparison of Statistical Downscaling Techniques for Multisite Daily Rainfall Conditioned on Atmospheric Variables for the Sydney Region", "abstract": "", "keywords": "", "authors": [ { "name": "Andrew Frost", "org": "" }, { "name": "R. Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "R Srikanthan", "org": "" } ], "venue": "Australian journal of water resources", "year": 2009 }, "fAgKi07A": { "id": "fAgKi07A", "title": "Preliminary analysis of trends in Australian flood data", "abstract": "", "keywords": [], "authors": [ { "name": "george kuczera", "org": "" }, { "name": "elias h ishak", "org": "" }, { "name": "ataur rahman", "org": "" }, { "name": "sjirk j westra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2015 }, "5Aq2WPrl": { "id": "5Aq2WPrl", "title": "Towards dynamic catchment modelling: a Bayesian hierarchical mixtures of experts framework", "abstract": "", "keywords": [], "authors": [ { "name": "Lucy Marshall", "org": "" }, { "name": "David Nott", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Hydrological Processes", "year": 2007 }, "tVoX2vtn": { "id": "tVoX2vtn", "title": "Merging radar and in situ rainfall measurements: An assessment of different combination algorithms: AN ASSESSMENT OF DIFFERENT COMBINATION ALGORITHMS", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Mahadi Hasan", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Gregoire Mariethoz", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Gregoire Mariethoz", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Alan Seed", "org": "" }, { "name": "Alan Seed", "org": "" } ], "venue": "Water Resources Research", "year": 2016 }, "zNQGe7qH": { "id": "zNQGe7qH", "title": "Stochastic Generation of Rainfall and Streamflow Time Series at Multiple Sites Using Independent Component Analysis", "abstract": "", "keywords": [ "publishing", "commissioning", "academic research" ], "authors": [ { "name": "seth westra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "casey brown", "org": "" }, { "name": "upmanu lall", "org": "" } ], "venue": "", "year": 2006 }, "ueALhjdT": { "id": "ueALhjdT", "title": "Why continuous simulation? The role of antecedent moisture in design flood estimation", "abstract": "", "keywords": [ "antecedent moisture" ], "authors": [ { "name": "s pathiraja", "org": "nust school of civil and environmental engineering" }, { "name": "sjirk j westra", "org": "university of adelaide" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2012 }, "3aQ3zAHQ": { "id": "3aQ3zAHQ", "title": "Continuous rainfall simulation: 2. A regionalized daily rainfall generation approach", "abstract": "", "keywords": [], "authors": [ { "name": "rajeshwar mehrotra", "org": "nust school of civil and environmental engineering" }, { "name": "seth westra", "org": "university of adelaide" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" }, { "name": "r srikanthan", "org": "bureau of meteorology" } ], "venue": "Water Resources Research", "year": 2012 }, "zwI27wFE": { "id": "zwI27wFE", "title": "Quantile regression for investigating scaling of extreme precipitation with temperature", "abstract": "", "keywords": [ "climate change", "quantile regression" ], "authors": [ { "name": "conrad wasko", "org": "nust school of civil and environmental engineering" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2014 }, "4Ea9NHGo": { "id": "4Ea9NHGo", "title": "An Assessment of Future Water Availability across the World Using Nested Bias Corrected GCM Precipitation Outputs", "abstract": "", "keywords": [ "academic research", "commissioning", "publishing" ], "authors": [ { "name": "fiona johnson", "org": "" }, { "name": "a sharma", "org": "" } ], "venue": "", "year": 2009 }, "LLRow1Wh": { "id": "LLRow1Wh", "title": "Comparing and Combining Remotely Sensed Land Surface Temperature Products for Improved Hydrological Applications.", "abstract": "Land surface temperature (LST) is an important variable that provides a valuable connection between the energy and water budget and is strongly linked to land surface hydrology. Space-borne remote sensing provides a consistent means for regularly observing LST using thermal infrared (TIR) and passive microwave observations each with unique strengths and weaknesses. The spatial resolution of TIR based LST observations is around 1 km, a major advantage when compared to passive microwave observations (around 10 km). However, a major advantage of passive microwaves is their cloud penetrating capability making them all-weather sensors whereas TIR observations are routinely masked under the presence of clouds and aerosols. In this study, a relatively simple combination approach that benefits from the cloud penetrating capacity of passive microwave sensors was proposed. In the first step, TIR and passive microwave LST products were compared over Australia for both anomalies and raw timeseries. A very high agreement was shown over the vast majority of the country with R2 typically ranging from 0.50 to 0.75 for the anomalies and from 0.80 to 1.00 for the raw timeseries. Then, the scalability of the passive microwave based LST product was examined and a pixel based merging approach through linear scaling was proposed. The individual and merged LST products were further compared against independent LST from the re-analysis model outputs. This comparison revealed that the TIR based LST product agrees best with the re-analysis data (R2 0.26 for anomalies and R2 0.76 for raw data), followed by the passive microwave LST product (R2 0.16 for anomalies and R2 0.66 for raw data) and the combined LST product (R2 0.18 for anomalies and R2 0.62 for raw data). It should be noted that the drop in performance comes with an increased revisit frequency of approximately 20% compared to the revised frequency of the TIR alone. Additionally, this comparison against re-analysis data was subdivided over Australia’s major climate zones and revealed that the relative agreement between the individual and combined LST products against the re-analysis data is consistent over these climate zones. These results are also consistent for both the anomalies and the raw time series. Finally, two examples were provided that demonstrate the proposed merging approach including an example for the Hunter Valley floods along Australia’s central coast that experienced significant flooding in April 2015.", "keywords": "", "authors": [ { "name": "Robert M. Parinussa", "org": "University of New South Wales" }, { "name": "Venkat Lakshmi", "org": "University of New South Wales" }, { "name": "Fiona M. Johnson", "org": "University of South Carolina" }, { "name": "Ashish Sharma", "org": "University of New South Wales" } ], "venue": "Remote Sensing", "year": 2016 }, "WZnrpkpU": { "id": "WZnrpkpU", "title": "A cascade approach to continuous rainfall data generation at point locations", "abstract": "High-resolution temporal rainfall data sequences serve as inputs for a range of applications in planning, design and management\n of small (especially urban) water resources systems, including continuous flow simulation and evaluation of alternate policies\n for environmental impact assessment. However, such data are often not available, since their measurements are costly and time-consuming.\n One alternative to obtain high-resolution data is to try to derive them from available low-resolution information through\n a disaggregation procedure. This study evaluates a random cascade approach for generation of high-resolution rainfall data\n at a point location. The approach is based on the concept of scaling in rainfall, or, relating the properties associated with\n the rainfall process at one temporal scale to a finer-resolution scale. The procedure involves two steps: (1) identification\n of the presence of scaling behavior in the rainfall process; and (2) generation of synthetic data possessing same/similar\n scaling properties of the observed rainfall data. The scaling identification is made using a statistical moment scaling function,\n and the log–Poisson distribution is assumed to generate the synthetic rainfall data. The effectiveness of the approach is\n tested on the rainfall data observed at the Sydney Observatory Hill, Sydney, Australia. Rainfall data corresponding to four\n different successively doubled resolutions (daily, 12, 6, and 3 h) are studied, and disaggregation of data is attempted only\n between these successively doubled resolutions. The results indicate the presence of multi-scaling behavior in the rainfall\n data. The synthetic data generated using the log–Poisson distribution are found to exhibit scaling behaviors that match very\n well with that for the observed data. However, the results also indicate that fitting the scaling function alone does not\n necessarily mean reproducing the broader attributes that characterize the data. This observation clearly points out the extreme\n caution needed in the application of the existing methods for identification of scaling in rainfall, especially since such\n methods are also prevalent in studies of the emerging satellite observations and thus in the broader spectrum of hydrologic\n modeling.", "keywords": [ "High-resolution rainfall", "Data transformation", "Scale-invariance", "Random cascade", "Moment scaling function", "Log–Poisson distribution", "Sydney" ], "authors": [ { "name": "Bellie Sivakumar", "org": "Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" } ], "venue": "Stochastic Environmental Research and Risk Assessment", "year": 2008 }, "g0wXiVB5": { "id": "g0wXiVB5", "title": "Application of Scaling in Radar Reflectivity for Correcting Range-Dependent Bias in Climatological Radar Rainfall Estimates", "abstract": "", "keywords": [], "authors": [ { "name": "Siriluk Chumchean", "org": "" }, { "name": "Alan Seed", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Atmospheric and Oceanic Technology", "year": 2004 }, "ZN51NdNc": { "id": "ZN51NdNc", "title": "Assessment of water and energy scarcity, security and sustainability into the future for the Three Gorges Reservoir using an ensemble of RCMs", "abstract": "", "keywords": "", "authors": [ { "name": "Hu Hu", "org": "" }, { "name": "Kan Yang", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Raj Mehrotra", "org": "" } ], "venue": "Journal of Hydrology", "year": 2020 }, "KZax1r1U": { "id": "KZax1r1U", "title": "A nonparametric nonhomogeneous hidden Markov model for downscaling of multisite daily rainfall occurrences", "abstract": "A K-nearest-neighbor (KNN)-based nonparametric nonhomogenous hidden Markov model is developed and applied for spatial downscaling of multistation daily rainfall occurrences using four atmospheric circulations variables (mean sea level pressure (MSLP), east-west gradient of MSLP, north-south gradient of geopotential height at 700 hPa, and total precipitable water content) over a network of 30 rain gauge stations near Sydney, Australia. The proposed model generates rainfall occurrence conditional to a continuous weather state and the average rainfall occurrence over the previous day. The current day weather state is defined conditional to the previous day weather state and selected atmospheric variables. For each day a weather state is specified on the basis of the spatial rainfall occurrence distribution over the study region. The spatial rainfall distribution is represented on the basis of the wetness fraction for the region and its location from a fixed origin. The relative influence of each predictor variable on the conditional probability density function is ascertained by including an influence weight in the distance calculation. The influence weights are optimized by maximizing the likelihood score in leave-one-out cross validation. Rainfall occurrences at stations are estimated in a leave-6-years-out cross validation using the optimized influence weights. Results from the proposed model are compared with the weather state–based parametric nonhomogeneous hidden Markov model (NHMM) and a standard KNN model. Results of the study show that introduction of a weather state in KNN simplifies the representation of spatial rainfall distribution structure, while conditioning on the atmospheric variables and previous day weather state helps represent the temporal structure of the rainfall process over the study region. The continuous weather states adopted in the proposed model are more successful in capturing the day-to-day rainfall characteristics in comparison to discrete state NHMM. The grouping of continuous weather states into a few discrete categories is shown to correspond to the dominant synoptic-scale features of rainfall distribution.", "keywords": [ "atmospheric circulation", "multistation rainfall occurrence", "nonparametric nonhomogeneous hidden markov model", "k-nearest-neighbor resampling", "weather state", "leave one out cross validation", "cross validation", "k nearest neighbor", "conditional probability", "global change", "hidden markov model", "time series analysis" ], "authors": [ { "name": "rajiv mehrotra", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" } ], "venue": "Journal of Geophysical Research", "year": 2005 }, "U8ZVkqst": { "id": "U8ZVkqst", "title": "Multi-model drought predictions using temporally aggregated climate indicators", "abstract": "", "keywords": "", "authors": [ { "name": "Mamunur Rashid", "org": "School of Civil & Environmental Engineering University of New South Wales Sydney Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia." }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia." } ], "venue": "", "year": 2019 }, "3p8JjwW7": { "id": "3p8JjwW7", "title": "Continuous rainfall simulation: 1. A regionalized subdaily disaggregation approach", "abstract": "", "keywords": [ "logistic regression", "antecedent moisture" ], "authors": [ { "name": "seth westra", "org": "university of adelaide" }, { "name": "rajeshwar mehrotra", "org": "nust school of civil and environmental engineering" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" }, { "name": "r srikanthan", "org": "bureau of meteorology" } ], "venue": "Water Resources Research", "year": 2012 }, "X61IdCWZ": { "id": "X61IdCWZ", "title": "A single model ensemble versus a dynamic modeling platform: Semi-distributed rainfall runoff modeling in a Hierarchical Mixtures of Experts framework", "abstract": "One way to address the perceived biases in many hydrological model simulations is to incorporate the information from several models at once. In this study we present an alternative where the catchment can be modeled as existing under a number of discrete states, which are chosen in a probabilistic manner based on selected catchment indicators. We present an application of the approach in the context of a semi-distributed catchment simulation model. We compare the predictive performance of several observed and simulated catchment indicators for aggregating the models via three catchments in different continental, geographic and climatic settings. Two main conclusions are drawn: (a) the multiple state representation of catchment behavior is an attractive alternative to single model parameterizations in terms of predictive power, and (b) each of the discrete probabilistic states is predictable using catchment indicators that reflect the lower order runoff producing mechanisms.", "keywords": [ "hydrology", "mixture of experts", "rainfall-runoff model", "simulation model" ], "authors": [ { "name": "Lucy Marshall", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "David Nott", "org": "" } ], "venue": "Geophysical Research Letters", "year": 2007 }, "lCKNm4ke": { "id": "lCKNm4ke", "title": "If Precipitation Extremes Are Increasing, Why Aren't Floods?", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Civil and Environmental Engineering The University of New South Wales Sydney New South Wales Australia" }, { "name": "Conrad Wasko", "org": "Department of Infrastructure Engineering The University of Melbourne Melbourne Victoria Australia" }, { "name": "Dennis P. Lettenmaier", "org": "Department of Geography University of California Los Angeles Los Angeles CA USA" } ], "venue": "Water Resources Research", "year": 2018 }, "5zANTFwy": { "id": "5zANTFwy", "title": "Australia's Rainfall and Pacific Ocean Heat Storage", "abstract": "", "keywords": [ "publishing", "academic research", "commissioning" ], "authors": [ { "name": "j e ruiz", "org": "" }, { "name": "ian cordery", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2005 }, "nqqERIu9": { "id": "nqqERIu9", "title": "Deriving daily water levels from satellite altimetry and land surface temperature for sparsely gauged catchments: A case study for the Mekong River", "abstract": "Abstract Space borne radar altimeters often complement in-situ water levels to provide greater insights to hydrodynamic models in sparsely gauged catchments. However, 10-day or 35-day water levels derived from satellite radar altimetry are generally too infrequent for flood forecasting or hydrodynamic modelling purposes. This paper proposes a new approach to find daily water levels for areas where in-situ river heights are not available. The new approach is based on the relationship between river height and difference between daytime and night time land surface temperatures (LST). This relationship is first demonstrated using in-situ gauge data to explore appropriate statistical models to predict river height using LST differences. The approach is then applied to a number of virtual stations at the intersections between the Mekong River and the ground-tracks of Jason-2 satellite altimetry which gives 10-day water level time series. The LST difference from the thermal infrared (TIR) observations of Moderate Resolution Imaging Spectro-radiometer (MODIS) is shown to have a strong relationship with in-situ water levels and a good relationship with the Jason-2 water levels. The models included a simple linear regression model which was then extended to firstly include seasonal terms and secondly assimilate satellite altimetry data. A regression model tree (M5) was also considered but was found to be inferior to the seasonal linear model. The developed regression models were used to predict daily water levels to infill the 10-day Jason-2 altimeters. RMSE of modelled daily water levels at gauges is between 0.3 m to 0.6 m, while RMSE of modelled daily water levels without using in-situ data is higher varying from 1.4 m to 1.9 m. The temporal correlation between the modelled water levels using satellite altimeters at virtual stations and in-situ water levels at adjacent gauges ranged from 0.72 to 0.86. These results show the potential of the proposed approach to produce high temporal resolution water levels for flood models or other applications using only remotely sensed data.", "keywords": "", "authors": [ { "name": "Hung T. Pham", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Hung T. Pham", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Lucy Marshall", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" } ], "venue": "Remote Sensing of Environment", "year": 2018 }, "BZEvmCXI": { "id": "BZEvmCXI", "title": "Recursively updating the error forecasting scheme of a complementary modelling framework for improved reservoir inflow forecasts", "abstract": "", "keywords": [], "authors": [ { "name": "a s gragne", "org": "" }, { "name": "knut alfredsen", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "raj n mehrotra", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "tDDMX7zI": { "id": "tDDMX7zI", "title": "Integrating Ocean Subsurface Temperatures in Statistical ENSO Forecasts", "abstract": "", "keywords": [], "authors": [ { "name": "Jose Eric Ruiz", "org": "" }, { "name": "Ian Cordery", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Climate", "year": 2005 }, "CTqLN3oA": { "id": "CTqLN3oA", "title": "WRF Model Prediction of a Dense Fog Event Occurred During the Winter Fog Experiment (WIFEX)", "abstract": "In this study, the sensitivity of the Weather Research and Forecasting (WRF) model to simulate the life cycle of a dense fog event that occurred on 23–24 January 2016 is evaluated using different model configurations. For the first time, intensive observational periods (IOPs) were made during the unique winter fog experiment (WIFEX) that took place over Delhi, India, where air quality is serious during the winter months. The multiple sensitivity experiments to evaluate the WRF model performance included parameters such as initial model and boundary conditions, vertical resolution in the lower boundary layer (BL), and the planetary BL (PBL) physical parameterizations. In addition, the model sensitivity was tested using various configurations that included domain size and grid resolution. Results showed that simulations with a high number of vertical levels within the lower PBL height (i.e., 10 levels below 300 m) simulated the accurate timing of fog formation, development, and dissipation. On the other hand, simulations with less vertical levels in the PBL captured only the mature physical characteristics of the fog cycle. A comparison of six local PBL schemes showed little variation in the onset of fog life cycle in comparison to observations of visibility. However, comparisons of observations with thermodynamical values such as 2-m temperature and longwave radiation showed poor relationships. Overall, quasi-normal scale elimination (QNSE) and MYNN 2.5 PBL schemes simulated the complete fog life cycle correctly with high liquid water content (LWC; 0.5/0.35 g m−3), while other schemes only responded during the mature phase.", "keywords": [ "Liquid water content", "PBL scheme", "vertical level", "WIFEX", "WRF model" ], "authors": [ { "name": "Prakash Pithani", "org": "Indian Institute of Tropical Meteorology,Pune,India" }, { "name": "Sachin D. Ghude", "org": "Indian Institute of Tropical Meteorology,Pune,India" }, { "name": "V Naidu Chennu", "org": "Department of Meteorology and Oceanography,Andhra University,Visakhapatnam,India" }, { "name": "Rachana G. Kulkarni", "org": "Indian Institute of Tropical Meteorology,Pune,India" }, { "name": "Gert-Jan Steeneveld", "org": "Meteorology and Air Quality Section,Wageningen University,Wageningen,The Netherlands" }, { "name": "Ashish Sharma", "org": "Environmental Change Initiative (ECI),South Bend,USA" }, { "name": "Thara Prabhakaran", "org": "Indian Institute of Tropical Meteorology,Pune,India" }, { "name": "D. M. Chate", "org": "Indian Institute of Tropical Meteorology,Pune,India" }, { "name": "Ismail Gultepe", "org": "Cloud Physics and Severe Weather Research Section,Environment and Climate Change Canada,Toronto,Canada" }, { "name": "R. K. Jenamani", "org": "India Meteorological Department,New Delhi,India" }, { "name": "Rajeevan Madhavan", "org": "Ministry of Earth Sciences,New Delhi,India" } ], "venue": "Pure and Applied Geophysics", "year": 2018 }, "JHgLei3m": { "id": "JHgLei3m", "title": "A programming tool for nonparametric system prediction using Partial Informational Correlation and Partial Weights.", "abstract": "Identification of system predictors forms the first step towards formulating a predictive model. Approaches for identifying such predictors are often limited by the need to assume a relationship between the predictor and response. To address this limitation, (Sharma and Mehrotra, 2014) presented a nonparametric predictive model using Partial Informational Correlation (PIC) and Partial Weights (PW). This study describes the open source Nonparametric Prediction (NPRED) R-package. NPRED identifies system predictors using the PIC logic, and predicts the response using a k-nearest-neighbor regression formulation based on a PW based weighted Euclidean distance. The capabilities of the package are demonstrated using synthetic examples and a real application of predicting seasonal rainfall in the Warragamba dam near Sydney, Australia. The results show clear improvements in predictability as compared to the use of linear predictive alternatives, as well as nonparametric alternatives that use an un-weighted Euclidean distance. Open source R package NPRED for system identification and prediction.Estimate Partial Informational Correlation (PIC) and Partial Weight (PW).Improves predictability compared to existing alternatives.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Rajeshwar Mehrotra", "org": "" }, { "name": "Jingwan Li", "org": "" }, { "name": "Sanjeev Jha", "org": "" } ], "venue": "Environmental Modelling and Software", "year": 2016 }, "tO5qJzan": { "id": "tO5qJzan", "title": "Development and Application of a Multisite Rainfall Stochastic Downscaling Framework for Climate Change Impact Assessment: A MULTISITE RAINFALL STOCHASTIC DOWNSCALING", "abstract": "", "keywords": [], "authors": [ { "name": "rajiv mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2010 }, "9wM5HCOy": { "id": "9wM5HCOy", "title": "An error estimation method for precipitation and temperature projections for future climates: QUANTIFYING GCMS OUTPUT UNCERTAINTY", "abstract": "", "keywords": [], "authors": [ { "name": "rajiv mehrotra", "org": "" }, { "name": "b sivakumar", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "f m woldemeskel", "org": "" } ], "venue": "Journal of Geophysical Research", "year": 2012 }, "VpnQyIIp": { "id": "VpnQyIIp", "title": "Hydrological model selection: A Bayesian alternative: HYDROLOGICAL MODEL SELECTION", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "Water Resources Research", "year": 2005 }, "s4LhT19L": { "id": "s4LhT19L", "title": "Evaluation of volcanic aerosol impacts on atmospheric water vapor using CMIP3 and CMIP5 simulations: VOLCANIC IMPACTS ON WATER VAPOR", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "jingwan li", "org": "" } ], "venue": "Journal of Geophysical Research", "year": 2013 }, "BlXzXOba": { "id": "BlXzXOba", "title": "Application of an improved linear storage routing model for the estimation of large floods", "abstract": "A runoff routing model, which incorporates a linear routing structure and attempts to provide a physically realistic distribution of storage effects, has recently been developed. The model with its physically realistic storage effects has been shown to provide consistently good reproduction of observed large floods without the need for parameter fitting or calibration. Storage distribution is determined from a volume law that accounts for the distribution of river channel storage in natural catchments. The model is briefly described, but the emphasis is on demonstrating its ability to reproduce large observed floods and design floods in China and Australia. The model results are compared with those from two commonly used non-linear storage routing models using several measures of performance. The probable maximum floods (PMFs) estimated based on all three models are also compared. The linear model using the proposed volume law is recommended for estimation of design floods because it has been shown to represent the observed geomorphological processes more realistically than other models, and because it reproduces observed large floods at least as well as the other models considered in this study.", "keywords": [ "storage routing", "flood estimation", "flood modelling", "linear model" ], "authors": [ { "name": "Shangyou Zhang", "org": "Agriculture Victoria-Rutherglen, RMB 1145, Chiltern Valley Road, Rutherglen, Victoria 3685, Australia" }, { "name": "Ian Cordery", "org": "" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2002 }, "hQEVKPIk": { "id": "hQEVKPIk", "title": "Hydrological model selection: A Bayesian alternative", "abstract": "The evaluation and comparison of hydrological models has long been a challenge to the practicing hydrological community. No single model can be identified as ideal over the range of possible hydrological situations. With the variety of models available, hydrologic modelers are faced with the problem of determining which model is best applied to a catchment for a particular modeling exercise. The model selection problem is well documented in hydrologic studies, but a broadly applicable as well as theoretically and practically sound method for comparing model performance does not exist in the literature. Bayesian statistical inference, with computations carried out via Markov chain Monte Carlo (MCMC) methods, offers an attractive alternative to conventional model selection methods allowing for the combination of any preexisting knowledge about individual models and their respective parameters with the available catchment data to assess both parameter and model uncertainty. The aim of this study is to present a method by which hydrological models may be compared in a Bayesian framework. The study builds on previous work (Marshall et al., 2004) in which a Bayesian approach implemented using MCMC algorithms was presented as a simple and efficient basis for assessing parameter uncertainty in hydrological models. In this study, a model selection framework is developed in which an adaptive Metropolis algorithm is used to calculate the model's posterior odds. The model used to illustrate our approach is a version of the Australian Water Balance Model (Boughton, 1993) reformulated such that it can have a flexible number of soil moisture storages. To assess the model selection method in a controlled setting, artificial runoff data were created corresponding to a known model configuration. These data were used to evaluate the accuracy of the model selection method and its sensitivity to the size of the sample being used. An application of the Bayesian model identification methodology to 11 years of daily streamflow data from the Murrumbidgee River at Mittagang Crossing in southeastern Australia concludes our study.", "keywords": [ "bayes factor", "bayesian", "model selection", "bayesian model", "metropolis algorithm", "bayesian approach", "soil moisture", "comparative modeling", "bayesian statistics", "markov chain monte carlo" ], "authors": [ { "name": "Lucy Marshall", "org": "" }, { "name": "David Nott", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2005 }, "9uSvc4tY": { "id": "9uSvc4tY", "title": "Errors in Hydrological Variables and Their Effect on Model Parameters", "abstract": "EXTENDED ABSTRACT True measurements of hydrological variables across full time and space domain are rarely available. Rather than the true values the best we often have are measured values with associated error variances. Model parameters are then estimated based on these measured values. This paper demonstrates that ignoring the structure of the errors introduce a systematic bias to estimated parameter values.", "keywords": [ "sacramento", "measurement error", "sea surface temperature", "simex", "southern oscillation index." ], "authors": [ { "name": "Shahadat Chowdhury", "org": "School of Civil and Environmental Engineering|University of NSW" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering|University of NSW" } ], "venue": "", "year": 0 }, "NKrLeQ33": { "id": "NKrLeQ33", "title": "Effects of Rain Gauge Temporal Resolution on the Specification of a Z–R Relationship", "abstract": "", "keywords": [ "radar", "resolution", "temporal resolution", "scaling", "rainfall", "estimation", "climatology" ], "authors": [ { "name": "Punpim Puttaraksa Mapiam", "org": "" }, { "name": "Nutchanart Sriwongsitanon", "org": "" }, { "name": "Siriluk Chumchean", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Atmospheric and Oceanic Technology", "year": 2009 }, "QqBC9wlf": { "id": "QqBC9wlf", "title": "The influence of data transformations in simulating Total Suspended Solids using Bayesian inference.", "abstract": "", "keywords": "", "authors": [ { "name": "Xia Wu", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia" }, { "name": "Lucy Marshall", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia" } ], "venue": "Environmental Modelling and Software", "year": 2019 }, "Yg0fM9nP": { "id": "Yg0fM9nP", "title": "Quantifying the sources of uncertainty in upper air climate variables: Uncertainty in Atmospheric Variables", "abstract": "", "keywords": "", "authors": [ { "name": "Sajjad Eghdamirad", "org": "" }, { "name": "Fiona Johnson", "org": "" }, { "name": "Fitsum Woldemeskel", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Geophysical Research", "year": 2016 }, "0TuvZ1sC": { "id": "0TuvZ1sC", "title": "Effect of solar variability on atmospheric moisture storage: SOLAR VARIABILITY AND ATMOSPHERIC MOISTURE", "abstract": "", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Geophysical Research Letters", "year": 2009 }, "HMr3iUZp": { "id": "HMr3iUZp", "title": "Improved water allocation utilizing probabilistic climate forecasts: Short-term water contracts in a risk management framework: WATER CONTRACTS FOR PROBABILISTIC FORECASTS", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "francisco assis souza filho", "org": "" }, { "name": "upmanu lall", "org": "" }, { "name": "a sankarasubramanian", "org": "" } ], "venue": "Water Resources Research", "year": 2009 }, "L8gpGVcT": { "id": "L8gpGVcT", "title": "A Comparison of Australian Open Water Body Evaporation Trends for Current and Future Climates Estimated from Class A Evaporation Pans and General Circulation Models", "abstract": "", "keywords": [], "authors": [ { "name": "Fiona Johnson", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Hydrometeorology", "year": 2010 }, "2S8h9qow": { "id": "2S8h9qow", "title": "Using second-order approximation to incorporate GCM uncertainty in climate change impact assessments", "abstract": "This study presents a method to incorporate uncertainty of climate variables in climate change impact assessments, where the uncertainty being considered refers to the divergence of general circulation model (GCM) projections. The framework assesses how much bias occurs when the uncertainties of climate variables are ignored. The proposed method is based on the second-order expansion of Taylor series, called second-order approximation (SOA). SOA addresses the bias which occurs by assuming the expected value of a function is equal to the function of the expected value of the predictors. This assumption is not valid for nonlinear systems, such as in the case of the relationship of climate variables to streamflow. To investigate the value of SOA in the climate change context, statistical downscaling models for monthly streamflow were set up for six hydrologic reference stations in Australia which cover contrasting hydro-climate regions. It is shown that in all locations SOA makes the largest difference for low flows and changes the overall mean flow by 1–3%. Another advantage of the SOA approach is that the individual contribution of each climate variable to the total difference can be estimated. It is found that geopotential height and specific humidity cause more bias than wind speeds in the downscaling models considered here.", "keywords": [ "Support Vector Machine", "Streamflow", "General Circulation Model", "Geopotential Height", "Support Vector Machine Model" ], "authors": [ { "name": "Sajjad Eghdamirad", "org": "School of Civil and Environmental Engineering,The University of New South Wales,Kensington,Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering,The University of New South Wales,Kensington,Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering,The University of New South Wales,Kensington,Australia" } ], "venue": "Climatic Change", "year": 2017 }, "651IcAXe": { "id": "651IcAXe", "title": "Stochastic downscaling of rainfall for use in hydrologic studies", "abstract": "During the past decade downscaling has become an established field to relate atmospheric circulation to surface variables for forecast and prediction of the regional climate. This article is a part of an ongoing study to develop statistical downscaling methods to enable downscaling of rainfall at hydrologically relevant spatial scales. This paper reviews the development and recent advances in stochastic downscaling techniques. Emphasis is given on application, advantages and limitations of currently used approaches. Results from an application of a non-parametric downscaling technique to select predictors (based on leave- one-out cross validation) for downscaling of point daily rainfall occurrence from area-average rainfall occurrence and temperature from ten locations near Sydney are presented. Results of the study indicate that the area-average temperature range and area-average rainfall occurrence on the current day are good predictors of point rainfall occurrence, for the Sydney region.", "keywords": [ "downscaling", "atmospheric circulation", "leave-one-out cross validation and rainfall prediction" ], "authors": [ { "name": "R. Mehrotra", "org": "School of Civil and Environmental Engineering|University of New South Wales" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering|University of New South Wales" }, { "name": "Ian Corder", "org": "School of Civil and Environmental Engineering|University of New South Wales" } ], "venue": "", "year": 0 }, "PMbJvWzz": { "id": "PMbJvWzz", "title": "Bayesian calibration and uncertainty analysis of hydrological models: A comparison of adaptive Metropolis and sequential Monte Carlo samplers", "abstract": "Hydrological model parameter optimization and uncertainty analysisImproved sampling of parameter posterior distributionSequential Monte Carlo parameter sampling algorithms", "keywords": [ "uncertainty analysis", "bayesian", "hydrological model", "monte carlo", "sequential monte carlo" ], "authors": [ { "name": "Erwin Jeremiah", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Scott Sisson", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Lucy Marshall", "org": "Land Resources and Environmental Science, Montana State University, Bozeman, Montana, USA" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" } ], "venue": "Water Resources Research", "year": 2011 }, "Jksfal95": { "id": "Jksfal95", "title": "Forecasting in changing catchments using data assimilation: new insights on systematic model errors", "abstract": "", "keywords": "", "authors": [ { "name": "Sahani Pathiraja", "org": "University of New South Wales" }, { "name": "Daniela Anghileri", "org": "ETH Zurich" }, { "name": "Paolo Burlando", "org": "ETH Zurich" }, { "name": "Ashish Sharma", "org": "University of New South Wales" }, { "name": "Lucy Marshall", "org": "University of New South Wales" }, { "name": "Hamid Moradkhani", "org": "Portland State University" } ], "venue": "congress on modelling and simulation", "year": 2017 }, "o1b4fpuW": { "id": "o1b4fpuW", "title": "Modeling multivariable hydrological series: Principal component analysis or independent component analysis?: MODELING MULTIVARIABLE HYDROLOGICAL SERIES", "abstract": "", "keywords": [], "authors": [ { "name": "seth westra", "org": "" }, { "name": "casey brown", "org": "" }, { "name": "upmanu lall", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2007 }, "IHUt3W5k": { "id": "IHUt3W5k", "title": "A metric for attributing variability in modelled streamflows", "abstract": "Abstract Significant gaps in our present understanding of hydrological systems lead to enhanced uncertainty in key modelling decisions. This study proposes a method, namely “Quantile Flow Deviation (QFD)”, for the attribution of forecast variability to different sources across different streamflow regimes. By using a quantile based metric, we can assess the change in uncertainty across individual percentiles, thereby allowing uncertainty to be expressed as a function of magnitude and time. As a result, one can address selective sources of uncertainty depending on whether low or high flows (say) are of interest. By way of a case study, we demonstrate the usefulness of the approach for estimating the relative importance of model parameter identification, objective functions and model structures as sources of stream flow forecast uncertainty. We use FUSE (Framework for Understanding Structural Errors) to implement our methods, allowing selection of multiple different model structures. Cross-catchment comparison is done for two different catchments: Leaf River in Mississippi, USA and Bass River of Victoria, Australia. Two different approaches to parameter estimation are presented that demonstrate the statistic- one based on GLUE, the other one based on optimization. The results presented in this study suggest that the determination of the model structure with the design catchment should be given priority but that objective function selection with parameter identifiability can lead to significant variability in results. By examining the QFD across multiple flow quantiles, the ability of certain models and optimization routines to constrain variability for different flow conditions is demonstrated.", "keywords": "", "authors": [ { "name": "Syed Abu Shoaib", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Lucy Marshall", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" } ], "venue": "Journal of Hydrology", "year": 2016 }, "n34Aux1e": { "id": "n34Aux1e", "title": "Combining the Strengths of Physically Based Models with Statistical Modelling Tools Using a Hierarchical Mixture of Experts Framework", "abstract": "", "keywords": [ "statistical modelling", "bayesian inference", "probability distribution", "component model", "model specification", "model error", "bayesian approach" ], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "", "year": 2005 }, "gsfDwFwp": { "id": "gsfDwFwp", "title": "Predicting cyanobacteria occurrence using climatological and environmental controls.", "abstract": "The occurrence of algal bloom results in deterioration of water quality, undesirable sights, tastes and odors, and the possibility of infections to humans and fatalities to livestock, wildlife and pets. Earlier studies have identified a range of factors including water temperature, flow, and nutrient concentrations that could affect cyanobacterial proliferation. Lack of enough data, independence in data across multiple sampling time steps, as well as the presence of more than one causative factors, each with different levels of influence on the response, has resulted in limited progress in the development of generalized prediction frameworks for cyanobacteria. In this study, a prediction model for cyanobacteria occurrences was developed using only three dominant environmental variables; water temperature, velocity and phosphorus concentration. These environmental variables were selected due to not only direct or joint contribution to algal bloom but also the ease of their availability either through direct measurements or as modelled responses in the river location of interest. In order to apply bacterial growth dynamic to the model, weight functions which quantify the importance assigned to the three variables depending on the cell number at the preceding time, were formulated. An extensive dataset spanning from 2013 to 2018 at 16 representative locations across the four major rivers in South Korea was used to develop and validate the model. Through cross-validation, this model was shown to have more than 75% forecasting accuracy despite the use of a relatively simple predictive algorithm. As the developed model makes use of commonly available environmental variables, it can easily be extended to locations across the country where very limited or no prior information about cyanobacteria bloom is available.", "keywords": [ "Cyanobacterial bloom", "River", "Temperature", "Total phosphorus", "Velocity", "Weighted function model" ], "authors": [ { "name": "Seungbeom Kim", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia; K-water, Daejeon, 34350, Republic of Korea. Electronic address: gogo1380@kwater.or.kr." }, { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia. Electronic address: seokhyeon.kim@unsw.edu.au." }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia. Electronic address: raj.mehrotra@unsw.edu.au." }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia. Electronic address: a.sharma@unsw.edu.au." } ], "venue": "Water research", "year": 2020 }, "smHi1BCa": { "id": "smHi1BCa", "title": "Global assessment of flood and storm extremes with increased temperatures.", "abstract": "There is overwhelming consensus that the intensity of heavy precipitation events is increasing in a warming world. It is generally expected such increases will translate to a corresponding increase in flooding. Here, using global data sets for non-urban catchments, we investigate the sensitivity of extreme daily precipitation and streamflow to changes in daily temperature. We find little evidence to suggest that increases in heavy rainfall events at higher temperatures result in similar increases in streamflow, with most regions throughout the world showing decreased streamflow with higher temperatures. To understand why this is the case, we assess the impact of the size of the catchment and the rarity of the event. As the precipitation event becomes more extreme and the catchment size becomes smaller, characteristics such as the initial moisture in the catchment become less relevant, leading to a more consistent response of precipitation and streamflow extremes to temperature increase. Our results indicate that only in the most extreme cases, for smaller catchments, do increases in precipitation at higher temperatures correspond to increases in streamflow.", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, 2052, Australia. conrad.wasko@unsw.edu.au." }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, 2052, Australia." } ], "venue": "Scientific reports", "year": 2017 }, "k72sr3L2": { "id": "k72sr3L2", "title": "Consideration of Trends in Evaluating Inter-basin Water Transfer Alternatives within a Fuzzy Decision Making Framework", "abstract": "Evaluation of water supply schemes is an essential task for meeting the goals of inter-basin water transfer project system\n management. In general, water supply operation involves multi-objective and multifactor optimization and decision. In recent\n years, multicriterion decision making (MCDM) has emerged as an effective methodology due to its ability to combine quantitative\n and qualitative criteria for selection of the best alternative. This paper presents a new optimization method using fuzzy\n pattern recognition to appraise the water supply decision schemes in inter-basin diversion systems. The proposed method is\n capable to incorporate not only the will of the decision-makers but also the future development trend of water resources and\n water supply demand and makes the optimization results more reasonable and applicable. One case study for the Xi-River-to\n -Tanghe Reservoir Water Transfer Project System in China is presented to demonstrate the application of this method.", "keywords": [ "Fuzzy pattern recognition model", "Weigh trend coefficient", "Optimization of water supply scheme", "Water supply of diversion system", "Inter-basin water transfer" ], "authors": [ { "name": "Li Xuesen", "org": "School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024 China" }, { "name": "Wang Bende", "org": "School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024 China" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Wang Guoli", "org": "School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024 China" } ], "venue": "Water Resources Management", "year": 2009 }, "1CfvdyMu": { "id": "1CfvdyMu", "title": "Water resources climate change projections using supervised nonlinear and multivariate soft computing techniques", "abstract": "Summary Accurate projection of global warming on the probabilistic behavior of hydro-climate variables is one of the main challenges in climate change impact assessment studies. Due to the complexity of climate-associated processes, different sources of uncertainty influence the projected behavior of hydro-climate variables in regression-based statistical downscaling procedures. The current study presents a comprehensive methodology to improve the predictive power of the procedure to provide improved projections. It does this by minimizing the uncertainty sources arising from the high-dimensionality of atmospheric predictors, the complex and nonlinear relationships between hydro-climate predictands and atmospheric predictors, as well as the biases that exist in climate model simulations. To address the impact of the high dimensional feature spaces, a supervised nonlinear dimensionality reduction algorithm is presented that is able to capture the nonlinear variability among projectors through extracting a sequence of principal components that have maximal dependency with the target hydro-climate variables. Two soft-computing nonlinear machine-learning methods, Support Vector Regression (SVR) and Relevance Vector Machine (RVM), are engaged to capture the nonlinear relationships between predictand and atmospheric predictors. To correct the spatial and temporal biases over multiple time scales in the GCM predictands, the Multivariate Recursive Nesting Bias Correction (MRNBC) approach is used. The results demonstrate that this combined approach significantly improves the downscaling procedure in terms of precipitation projection.", "keywords": "", "authors": [ { "name": "Ali Sarhadi", "org": "Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L-3G1, Canada" }, { "name": "Donald H. Burn", "org": "Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L-3G1, Canada" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Kensington, New South Wales 2052, Australia" }, { "name": "Raj Mehrotra", "org": "School of Civil and Environmental Engineering, University of New South Wales, Kensington, New South Wales 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Kensington, New South Wales 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2016 }, "zFt5Q5zZ": { "id": "zFt5Q5zZ", "title": "Representing low‐frequency variability in continuous rainfall simulations: A Hierarchical Random Bartlett Lewis continuous rainfall generation model", "abstract": "Low-frequency variability, in the form of the El Nino-Southern Oscillation, plays a key role in shaping local weather systems. However, current continuous stochastic rainfall models do not account for this variability in their simulations. Here a modified Random Pulse Bartlett Lewis stochastic generation model is presented for continuous rainfall simulation exhibiting low-frequency variability. Termed the Hierarchical Random Bartlett Lewis Model (HRBLM), the model features a hierarchical structure to represent a range of rainfall characteristics associated with the El Nino-Southern Oscillation with parameters conditioned to vary as functions of relevant climatic states. Long observational records of near-continuous rainfall at various locations in Australia are used to formulate and evaluate the model. The results indicate clear benefits of using the hierarchical climate-dependent structure proposed. In addition to accurately representing the wet spells characteristics and observed low-frequency variability, the model replicates the interannual variability of the antecedent rainfall preceding the extremes, which is known to be of considerable importance in design flood estimation applications.", "keywords": [ "el nino southern oscillation" ], "authors": [ { "name": "conrad wasko", "org": "university of new south wales" }, { "name": "alexander pui", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" }, { "name": "rajeshwar mehrotra", "org": "university of new south wales" }, { "name": "erwin jeremiah", "org": "university of new south wales" } ], "venue": "Water Resources Research", "year": 2015 }, "5jDsYUUL": { "id": "5jDsYUUL", "title": "A space and time scale-dependent nonlinear geostatistical approach for downscaling daily precipitation and temperature: GEOSTATISTICAL DOWNSCALING OF PRECIPITATION AND TEMPERATURE", "abstract": "", "keywords": "", "authors": [ { "name": "Sanjeev Kumar Jha", "org": "" }, { "name": "Sanjeev Kumar Jha", "org": "" }, { "name": "Gregoire Mariethoz", "org": "" }, { "name": "Gregoire Mariethoz", "org": "" }, { "name": "Jason P. Evans", "org": "" }, { "name": "Matthew F. McCabe", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2015 }, "0fKEj6jr": { "id": "0fKEj6jr", "title": "Multivariate streamflow forecasting using independent component analysis", "abstract": "Seasonal forecasting of streamflow provides many benefits to society, by improving our ability to plan and adapt to changing water supplies. A common approach to developing these forecasts is to use statistical methods that link a set of predictors representing climate state as it relates to historical streamflow, and then using this model to project streamflow one or more seasons in advance based on current or a projected climate state. We present an approach for forecasting multivariate time series using independent component analysis (ICA) to transform the multivariate data to a set of univariate time series that are mutually independent, thereby allowing for the much broader class of univariate models to provide seasonal forecasts for each transformed series. Uncertainty is incorporated by bootstrapping the error component of each univariate model so that the probability distribution of the errors is maintained. Although all analyses are performed on univariate time series, the spatial dependence of the streamflow is captured by applying the inverse ICA transform to the predicted univariate series. We demonstrate the technique on a multivariate streamflow data set in Colombia, South America, by comparing the results to a range of other commonly used forecasting methods. The results show that the ICA-based technique is significantly better at representing spatial dependence, while not resulting in any loss of ability in capturing temporal dependence. As such, the ICA-based technique would be expected to yield considerable advantages when used in a probabilistic setting to manage large reservoir systems with multiple inflows or data collection points.", "keywords": [ "colombia", "independent component analysis", "streamflow", "seasonality", "probability distribution", "multivariate data", "water supply", "time series", "principal component analysis", "data collection", "spatial dependence", "global change" ], "authors": [ { "name": "Seth Westra", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Casey Brown", "org": "" }, { "name": "Upmanu Lall", "org": "Department of Earth and Environmental Engineering|Columbia , University" } ], "venue": "Water Resources Research", "year": 2008 }, "CQSJuHwW": { "id": "CQSJuHwW", "title": "Patterns and comparisons of human-induced changes in river flood impacts in cities", "abstract": "Abstract. In this study, information extracted from the first global urban fluvial flood risk data set (Aqueduct) is investigated and visualized to explore current and projected city-level flood impacts driven by urbanization and climate change. We use a novel adaption of the self-organizing map (SOM) method, an artificial neural network proficient at clustering, pattern extraction, and visualization of large, multi-dimensional data sets. Prevalent patterns of current relationships and anticipated changes over time in the nonlinearly-related environmental and social variables are presented, relating urban river flood impacts to socioeconomic development and changing hydrologic conditions. Comparisons are provided between 98 individual cities. Output visualizations compare baseline and changing trends of city-specific exposures of population and property to river flooding, revealing relationships between the cities based on their relative map placements. Cities experiencing high (or low) baseline flood impacts on population and/or property that are expected to improve (or worsen), as a result of anticipated climate change and development, are identified and compared. This paper condenses and conveys large amounts of information through visual communication to accelerate the understanding of relationships between local urban conditions and global processes.", "keywords": "", "authors": [ { "name": "Stephanie Clark", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Scott A. Sisson", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, Australia" } ], "venue": "Hydrology and Earth System Sciences", "year": 2017 }, "WWjiaB0e": { "id": "WWjiaB0e", "title": "Multi-objective assessment of three remote sensing vegetation products for streamflow prediction in a conceptual ecohydrological model", "abstract": "Abstract This study assesses the implications of using three alternate remote sensing vegetation products in the simulation of streamflow using a conceptual ecohydrologic model. Vegetation is represented as a dynamic component in this model which simulates two response variables, streamflow and one of the following three vegetation attributes: Gross Primary Productivity (GPP), Leaf Area Index (LAI) or Vegetation Optical Depth (VOD). Model simulations are performed across 50 catchments with areas ranging between 50 and 1600 km 2 in the Murray-Darling Basin in Australia. Moderate Resolution Imaging Spectroradiometer (MODIS) LAI and GPP products, passive microwave observations of VOD and streamflow are used for model calibration and/or validation. Single-objective model calibration based on one of the vegetation products (GPP, LAI and VOD) shows that GPP is the best vegetation simulating product. On the contrary, LAI produces the best streamflow during validation when the optimized parameters are applied for streamflow estimation. To obtain the best compromise solution for simultaneous simulation of streamflow and a vegetation product, a multi-objective optimization is applied on GPP and streamflow, VOD and streamflow and LAI and streamflow. Results show that LAI and then VOD are the two best products in simulating streamflow across these catchments. Improved simulation of VOD and LAI in a multi-objective setting is partly related to the higher temporal resolution of these datasets and inclusion of processes for converting GPP to net primary productivity and biomass. It is suggested that further development of these remote sensing products at finer spatial and temporal resolutions may lead to improved streamflow prediction, as well as a better simulation capability of the ecohydrological system being modeled.", "keywords": "", "authors": [ { "name": "Bushra Naseem", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Hoori Ajami", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Hoori Ajami", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Yi Liu", "org": "ARC Centre of Excellence for Climate System Science & Climate Change Research Centre, UNSW, Sydney, Australia" }, { "name": "Ian Cordery", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2016 }, "lOy0rO7z": { "id": "lOy0rO7z", "title": "Efficient Bayesian Inference for Hydrological Modeling Applications: The Sequential Monte Carlo Sampler", "abstract": "", "keywords": [ "data assimilation", "prior distribution", "sequential monte carlo", "non linear dynamics", "evapotranspiration", "parameter space", "initial condition", "bayesian inference", "posterior distribution" ], "authors": [ { "name": "erwin jeremiah", "org": "" }, { "name": "scott a sisson", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "rajiv mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2010 }, "evJTVOFQ": { "id": "evJTVOFQ", "title": "Merging radar and in situ rainfall measurements: An assessment of different combination algorithms", "abstract": "Merging radar and gauge rainfall estimates is an area of active research. Since rain gauges alone are often limited at representing the complete spatial distribution of rainfall, a combination of radar derived rainfall with spatially interpolated gauge estimates using alternate weighting approaches is investigated. This paper examines several merging methods that differ in the consideration of correlation among the estimation errors, their distribution and the application of dynamic and static weighting. The merging process has been applied to the radar data from Terrey Hills radar located in Sydney, Australia and spatially interpolated gauge rainfall on the same area. The performance of the merging methods is assessed by comparing the combined estimate with the gauge observation. It is however clear from our findings that rainfall estimation from any of the combination approaches assessed contains less error than any of the non-combination approaches. The results show that the correlation between these two rainfall estimation errors plays a significant role in the performance of the merging methods. The combination method should be chosen depending on the purpose, accuracy of the estimate and complexity of the method. This article is protected by copyright. All rights reserved.", "keywords": "", "authors": [ { "name": "Mohammad Mahadi Hasan", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Gregoire Mariethoz", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" }, { "name": "Alan Seed", "org": "School of Civil and Environmental EngineeringUniversity of New South WalesSydney New South Wales Australia" } ], "venue": "Water Resources Research", "year": 2016 }, "tlRe83Fq": { "id": "tlRe83Fq", "title": "Catchment scale simulations of soil moisture dynamics using an equivalent cross-section based hydrological modelling approach", "abstract": "Abstract Physically based distributed hydrological models are useful for simulating the spatial distribution of hydrologic fluxes across the catchment under various climate and land cover change scenarios. However, complexities associated with their implementation at large scales make their applications limited. Previously, an equivalent cross-section (ECS) based distributed hydrological modelling approach was developed for first order sub-basins to reduce the computational time/effort. Here, the ECS approach is modified for semi-distributed hydrological modelling at the catchment scale. The modelling approach is implemented for a 314 km 2 McLaughlin catchment located in south-eastern New South Wales (NSW), Australia that consists of 822 first order sub-basins. A 26 year long streamflow record simulated using an ECS based modelling approach are compared against daily observed streamflow and four calibrated lumped conceptual hydrologic models, and found to be consistent. Further, the simulated actual evapotranspiration and soil moisture from the ECS approach are compared against the Australian Water Availability Project (AWAP) model simulations and results found to be consistent. In addition, the temporal dynamics of simulated soil moisture from the ECS approach is consistent with the satellite derived European Space Agency Climate Change Initiative (ESA CCI) surface soil moisture data. In the ECS based semi-distributed modelling, all parameters are derived from the actual topographic and physiographic information of the catchment and none of the parameters is calibrated. Therefore, this approach has the advantage of simulating streamflow in ungauged catchments compared to lumped conceptual models. The impact of spatially distributed climatic forcing and land cover on soil moisture is investigated across four landforms (upslope, midslope, footslope and alluvial-flats) and at various soil depths. Our results show increase of mean soil moisture in shallow layers of upslope toward alluvial-flats. However, mean soil moisture in deeper horizons remained almost constant across all landforms. The variability of daily soil moisture at surface soil layers is higher than the deeper soil layers for all landforms. Our results illustrated that disaggregation of a catchment to a series of ECS at the scale of first order sub-basins, captures dynamics of soil moisture and actual evapotranspiration across the landscape and results are consistent with the climatology, land cover type, topography and soil hydraulic properties. Further, the use of ECS approach in the McLaughlin catchment reduced the number of computational units by 40 times in comparison to 3-d grid based distributed modelling setup.", "keywords": "", "authors": [ { "name": "Urooj Khan", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Urooj Khan", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Hoori Ajami", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Hoori Ajami", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Narendra Kumar Tuteja", "org": "Water Forecasting Services, Bureau of Meteorology, Canberra, Australian Capital Territory, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" } ], "venue": "Journal of Hydrology", "year": 2018 }, "tamjrRM1": { "id": "tamjrRM1", "title": "Using all data to improve seasonal sea surface temperature predictions: A combination‐based model forecast with unequal observation lengths", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Zaved Kaiser Khan", "org": "School of Civil and Environmental Engineering The University of New South Wales Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering The University of New South Wales Sydney New South Wales Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering The University of New South Wales Sydney New South Wales Australia" } ], "venue": "International Journal of Climatology", "year": 2018 }, "XFOT2rKf": { "id": "XFOT2rKf", "title": "A framework for combining multiple soil moisture retrievals based on maximizing temporal correlation: IMPROVING AMSR2 SOIL MOISTURE RETRIEVALS", "abstract": "", "keywords": "", "authors": [ { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Robert M. Parinussa", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Yi Y. Liu", "org": "ARC Centre of Excellence for Climate Systems Science and Climate Change Research Centre; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" } ], "venue": "Geophysical Research Letters", "year": 2015 }, "7woETNdU": { "id": "7woETNdU", "title": "Impact of mid-Pacific Ocean thermocline on the prediction of Australian rainfall", "abstract": "The predictability of Australian rainfall using ocean heat content information is examined. The thermocline, represented by the second unrotated principal component of the 20 °C isotherm depth in the Pacific Ocean, is coupled with the Niño3 index to form the predictive model. The relevance of the subsurface oceanic information is evaluated by comparing results with two alternative approaches, both based on the use of sea surface temperatures. All approaches are applied to predict rainfall available on a 1×1° latitude–longitude grid covering Australia. Results are grouped according to dominant climatic regimes, and evaluated using leave-one-out cross-validation. The skill of each approach is measured using the linear error in probability space (LEPS) score. For a given climatic region, an improvement in skill due to an additional predictor is indicated by a positive shift in the empirical cumulative distribution function (CDF) of the LEPS scores of the constituent grids and by the number of grids that have a statistically significant hindcasting skill. Results show that the addition of thermocline information results in a significant increase in skill of hindcasts for all seasons and in several regions. The thermocline's influence is particularly strong during austral autumn when predictability of rain in the western and northern regions of Australia increased even up to a lag of 18 months. This is an encouraging result considering that prediction in autumn normally experiences a drop in skill due to the spring predictability barrier. By possessing high persistence during the first half of the year, the ocean heat content is able to defy the damping effect of the spring barrier. This study has demonstrated the potential of the thermocline as a direct predictor of Australian rainfall especially at long lead times.", "keywords": [ "ocean heat content", "leps", "crossvalidation", "australian rainfall", "forecasting", "thermocline", "cumulative distribution function", "principal component", "prediction model", "sea surface temperature", "seasonality", "leave one out cross validation", "indexation", "statistical significance" ], "authors": [ { "name": "Jose Eric Ruiz", "org": "" }, { "name": "Ian Cordery", "org": "School of Civil and Environmental Engineering, University of New South Wales, Anzac Parade, Kensington, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Anzac Parade, Kensington, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2006 }, "k2CbtNIs": { "id": "k2CbtNIs", "title": "Reduced spatial extent of extreme storms at higher temperatures: Reduced Spatial Extent of Extreme Storms", "abstract": "", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Seth Westra", "org": "School of Civil, Environmental and Mining Engineering; University of Adelaide; Adelaide South Australia Australia" } ], "venue": "Geophysical Research Letters", "year": 2016 }, "FkCxogli": { "id": "FkCxogli", "title": "Predicting hydrologic response through a hierarchical catchment knowledgebase: A Bayes empirical Bayes approach", "abstract": "", "keywords": [], "authors": [ { "name": "tyler smith", "org": "clarkson university" }, { "name": "lucy marshall", "org": "nust school of civil and environmental engineering" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2014 }, "rPsQ4uvm": { "id": "rPsQ4uvm", "title": "An assessment of drift correction alternatives for CMIP5 decadal predictions", "abstract": "Drift correction is an important step before using the outputs of decadal prediction experiments and has seen considerable research. However, most drift-correction studies consider a relatively small sample of variables and models. Here, we present a systematic application of the existing drift correction strategies for decadal predictions of various sea surface temperature (SST)-based metrics from a suite of five state-of-the-art climate models (CanCM4i1, GFDL-CM2.1, HadCM3i2u0026i3, MIROC5 and MPI-ESM-LR). The best method of drift correction for each metric and model is reported. Preliminary analysis suggests that there is no single method of drift correction that consistently performs best. Initial condition-based drift correction (ICDC) provides the lowest errors in most regions for MIROC5 and the two HadCM3 models, while the trend-based drift correction (TrDC) produces lowest errors for CanCM4i1, GFDL-CM2.1 and MPI-ESM-LR over the largest share of the area. There is no merit in using a k-nearest neighbour (k-nn) approach for these drift-correction methods. Further, in almost all cases, the multi-model ensemble (MME) outperforms the individual models, and thus the study conclusively suggests using forecasts based on multi-model averages. We also show some additional benefit to be gained by drift correcting each model/metric using their best correction method prior to model averaging and suggest that the results presented here would help potential users expend time and resources judiciously while dealing with outputs from these experiments.", "keywords": "", "authors": [ { "name": "Dipayan Choudhury", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" }, { "name": "Alex Sen Gupta", "org": "ARC Centre of Excellence for Climate System Science University of New South Wales Sydney Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" } ], "venue": "Journal of Geophysical Research", "year": 2017 }, "QhrFotZI": { "id": "QhrFotZI", "title": "Assessing the sensitivity of hydro-climatological change detection methods to model uncertainty and bias", "abstract": "Detection of systematic changes in the climate system resulting from anthropogenic forcing is a critical area of research. Detection and attribution of hydro-climatological change has been limited by model uncertainty and bias as well as the poor spatial-temporal coverage of observational data. This study assesses a routinely adopted detection methodology and its sensitivity to model uncertainty and bias within a hydro-climatological context. Using a synthetic case study, we establish the sensitivity of detection approaches to the magnitude and consistency of trend and variance along with the length of data available. It is found that the extent of uncertainty (as measured by the variance) plays a critical role in changing the detection outcome. Another important factor is the consistency of trend between simulations and observations. A case study of soil moisture in select locations within Australia shows that averaging over multiple years (e.g., five years to a decade) improves the detection of the climate change signal as long as consistency in the trends exists. Our results also demonstrate that there are substantial differences in simulated trends across climate models. Therefore, even though ensemble averaging is effective in modulating variance, it has the risk of canceling out the signal over models with markedly different responses.", "keywords": [ "Detection & attribution", "Sensitivity", "Model uncertainty and bias", "Soil moisture" ], "authors": [ { "name": "Ze Jiang", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Fiona Johnson", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2019 }, "64HQ9yXP": { "id": "64HQ9yXP", "title": "Increase in flood risk resulting from climate change in a developed urban watershed – the role of storm temporal patterns", "abstract": "Abstract. The effects of climate change are causing more frequent extreme rainfall events and an increased risk of flooding in developed areas. Quantifying this increased risk is of critical importance for the protection of life and property as well as for infrastructure planning and design. The updated National Oceanic and Atmospheric Administration (NOAA) Atlas 14 intensity–duration–frequency (IDF) relationships and temporal patterns are widely used in hydrologic and hydraulic modeling for design and planning in the United States. Current literature shows that rising temperatures as a result of climate change will result in an intensification of rainfall. These impacts are not explicitly included in the NOAA temporal patterns, which can have consequences on the design and planning of adaptation and flood mitigation measures. In addition there is a lack of detailed hydraulic modeling when assessing climate change impacts on flooding. The study presented in this paper uses a comprehensive hydrologic and hydraulic model of a fully developed urban/suburban catchment to explore two primary questions related to climate change impacts on flood risk. (1) How do climate change effects on storm temporal patterns and rainfall volumes impact flooding in a developed complex watershed? (2) Is the storm temporal pattern as critical as the total volume of rainfall when evaluating urban flood risk? We use the NOAA Atlas 14 temporal patterns, along with the expected increase in temperature for the RCP8.5 scenario for 2081–2100, to project temporal patterns and rainfall volumes to reflect future climatic change. The model results show that different rainfall patterns cause variability in flood depths during a storm event. The changes in the projected temporal patterns alone increase the risk of flood magnitude up to 35 %, with the cumulative impacts of temperature rise on temporal patterns and the storm volume increasing flood risk from 10 to 170 %. The results also show that regional storage facilities are sensitive to rainfall patterns that are loaded in the latter part of the storm duration, while extremely intense short-duration storms will cause flooding at all locations. This study shows that changes in temporal patterns will have a significant impact on urban/suburban flooding and need to be carefully considered and adjusted to account for climate change when used for the design and planning of future storm water systems.", "keywords": "", "authors": [ { "name": "Suresh Hettiarachchi", "org": "School of Civil and Environmental Engineering, University of New South#N#Wales, Sydney, Australia" }, { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering, University of New South#N#Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South#N#Wales, Sydney, Australia" } ], "venue": "Hydrology and Earth System Sciences", "year": 2018 }, "IAjeiREk": { "id": "IAjeiREk", "title": "Evaluation of downscaled daily rainfall hindcasts over Sydney, Australia using statistical and dynamical downscaling approaches", "abstract": "", "keywords": [], "authors": [ { "name": "rajeshwar mehrotra", "org": "" }, { "name": "j p evans", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "b sivakumar", "org": "" } ], "venue": "Hydrology Research", "year": 2014 }, "Y8UIU8nA": { "id": "Y8UIU8nA", "title": "Intensification of Convective Rain Cells at Warmer Temperatures Observed from High-Resolution Weather Radar Data", "abstract": "AbstractThis study contributes to the understanding of the relationship between air temperature and convection by analyzing the characteristics of rainfall at the storm and convective rain cell scales. High spatial–temporal resolution (1 km, 5 min) estimates from a uniquely long weather radar record (24 years) were coupled with near-surface air temperature over Mediterranean and semiarid regions in the eastern Mediterranean. In the examined temperature range (5°–25°C), the peak intensity of individual convective rain cells was found to increase with temperature, but at a lower rate than the 7%°C−1 scaling expected from the Clausius–Clapeyron relation, while the area of the individual convective rain cells slightly decreases or, at most, remains unchanged. At the storm scale, the areal convective rainfall was found to increase with warmer temperatures, whereas the areal nonconvective rainfall and the stormwide area decrease. This suggests an enhanced moisture convergence from the stormwide extent toward th...", "keywords": "", "authors": [ { "name": "Nadav Peleg", "org": " Institute of Environmental Engineering, Hydrology and Water Resources Management, ETH Zurich, Zurich, Switzerland" }, { "name": "Francesco Marra", "org": " Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel" }, { "name": "Simone Fatichi", "org": " Institute of Environmental Engineering, Hydrology and Water Resources Management, ETH Zurich, Zurich, Switzerland" }, { "name": "Peter Molnar", "org": " Institute of Environmental Engineering, Hydrology and Water Resources Management, ETH Zurich, Zurich, Switzerland" }, { "name": "Efrat Morin", "org": " Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel" }, { "name": "Ashish Sharma", "org": " School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Paolo Burlando", "org": " Institute of Environmental Engineering, Hydrology and Water Resources Management, ETH Zurich, Zurich, Switzerland" } ], "venue": "Journal of Hydrometeorology", "year": 2018 }, "mzGDgvbn": { "id": "mzGDgvbn", "title": "A Multivariate Quantile-Matching Bias Correction Approach with Auto- and Cross-Dependence across Multiple Time Scales: Implications for Downscaling", "abstract": "AbstractA novel multivariate quantile-matching nesting bias correction approach is developed to remove systematic biases in general circulation model (GCM) outputs over multiple time scales. This is a significant advancement over typical quantile-matching alternatives available for bias correction, as they implicitly assume that correction of individual variable attributes will lead to correction of dependence biases between multiple variables. Furthermore, existing approaches perform bias correction at a given time scale (e.g., daily), whereas applications often require biases to be addressed at more than one time scale (such as annual in the case of most water resources planning projects). The proposed approach addresses all these issues, and additionally attempts to correct for lag-1 dependence (and cross-dependence) attributes across multiple time scales. The approach is called multivariate recursive quantile nesting bias correction (MRQNBC). The fidelity of the approach is demonstrated by applying it...", "keywords": "", "authors": [ { "name": "Rajeshwar Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Climate", "year": 2016 }, "Hh5SrGvy": { "id": "Hh5SrGvy", "title": "Can integrated green spaces and storage facilities absorb the increased risk of flooding due to climate change in developed urban environments", "abstract": "", "keywords": "", "authors": [ { "name": "Kane Alexander", "org": "School of Civil and Environmental Engineering, University of New south Wales, Sydney, Australia" }, { "name": "Suresh Hettiarachchi", "org": "School of Civil and Environmental Engineering, University of New south Wales, Sydney, Australia" }, { "name": "Yixiao Ou", "org": "School of Civil and Environmental Engineering, University of New south Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New south Wales, Sydney, Australia" } ], "venue": "Journal of Hydrology", "year": 2019 }, "NRjDD1nY": { "id": "NRjDD1nY", "title": "Evaluating spatio-temporal representations in daily rainfall sequences from three stochastic multi-site weather generation approaches", "abstract": "Many hydrological and agricultural studies require simulations of weather variables reflecting observed spatial and temporal dependence at multiple point locations. This paper assesses three multi-site daily rainfall generators for their ability to model different spatio-temporal rainfall attributes over the study area. The approaches considered consist of a multi-site modified Markov model (MMM), a reordering method for reconstructing space–time variability, and a nonparametric k -nearest neighbour (KNN) model. Our results indicate that all the approaches reproduce adequately the observed spatio-temporal pattern of the multi-site daily rainfall. However, different techniques used to signify longer time scale observed temporal and spatial dependences in the simulated sequences, reproduce these characteristics with varying successes. While each approach comes with its own advantages and disadvantages, the MMM has an overall advantage in offering a mechanism for modelling varying orders of serial dependence at each point location, while still maintaining the observed spatial dependence with sufficient accuracy. The reordering method is simple and intuitive and produces good results. However, it is primarily driven by the reshuffling of the simulated values across realisations and therefore may not be suited in applications where data length is limited or in situations where the simulation process is governed by exogenous conditioning variables. For example, in downscaling studies where KNN and MMM can be used with confidence.", "keywords": [ "kernel density estimation", "knn model", "modified markov model", "spatio-temporal rainfall distribution", "sydney", "markov model", "spatial dependence", "kernel density estimate", "space time", "point location" ], "authors": [ { "name": "R. Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "The University of New South Wales, Water Research Centre, Kensington, Sydney, NSW 2052, Australia" } ], "venue": "Advances in Water Resources", "year": 2009 }, "luleVdih": { "id": "luleVdih", "title": "Impacts of the tropical trans-basin variability on Australian rainfall", "abstract": "A large-scale mode of sea level pressure variability between the Pacific and Atlantic basins—referred to as the tropical trans-basin variability (TBV)—has shown multi-year predictability beyond that normally associated with El Niño Southern Oscillation (ENSO). Here we examine the relationship between the TBV and regional rainfall, which, if significant, would imply that the TBV predictability could be used to improve rainfall forecasts. We find TBV to be significantly related to rainfall, a relationship that is strongest over Australia during spring. We find Australia to experience drier conditions during the positive phase of TBV and wetter conditions during the negative phase, a pattern similar to that of ENSO. Furthermore, TBV is associated with rainfall responses that are of similar magnitude to ENSO, but there is some degree of independence between TBV and the Pacific modes defined by sea surface temperature indices. The global teleconnections related to the different TBV phases suggest that though many TBV and ENSO events overlap, pure ENSO events are primarily driven by the Pacific whereas pure TBV events are driven by the Atlantic Ocean. An El Niño coupled with a positive TBV event leads to significant drying over the east coast of Australia while the combined negative phase leads to widespread wetting over most of the country, which can be attributed to an enhancement of the anomalous Walker Circulation and the resulting moisture convergence and wind patterns.", "keywords": [ "Tropical trans-basin variability (TBV)", "Australian rainfall", "Rainfall prediction", "El Niño Southern Oscillation" ], "authors": [ { "name": "Dipayan Choudhury", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,AustraliaARC Centre of Excellence for Climate System Science,University of New South Wales,Sydney,Australia" }, { "name": "Alexander Sen Gupta", "org": "ARC Centre of Excellence for Climate System Science,University of New South Wales,Sydney,AustraliaClimate Change Research Centre,University of New South Wales,Sydney,Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,Australia" }, { "name": "Andréa S. Taschetto", "org": "Climate Change Research Centre,University of New South Wales,Sydney,Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,AustraliaDepartment of Land, Air and Water Resources,University of California,Davis,USA" } ], "venue": "Climate Dynamics", "year": 2017 }, "XFZGguH4": { "id": "XFZGguH4", "title": "A nesting model for bias correction of variability at multiple time scales in general circulation model precipitation simulations", "abstract": "", "keywords": [ "climate change", "gcm" ], "authors": [ { "name": "fiona johnson", "org": "bureau of meteorology" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2012 }, "84VIfpw4": { "id": "84VIfpw4", "title": "Micro-albuminuria, Acute MI, Nephropathy.", "abstract": "", "keywords": [], "authors": [ { "name": "vijay kumar b a", "org": "" }, { "name": "rajshekar patil", "org": "" }, { "name": "satish mubdi", "org": "" }, { "name": "s b patil", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2014 }, "zXfF24au": { "id": "zXfF24au", "title": "A Resampling Approach for Correcting Systematic Spatiotemporal Biases for Multiple Variables in a Changing Climate", "abstract": "", "keywords": "", "authors": [ { "name": "R. Mehrotra", "org": "Water Research Centre, School of Civil and Environmental EngineeringThe University of New South Wales Sydney New South Wales Australia" }, { "name": "A. Sharma", "org": "Water Research Centre, School of Civil and Environmental EngineeringThe University of New South Wales Sydney New South Wales Australia" } ], "venue": "Water Resources Research", "year": 2019 }, "FV30XHZp": { "id": "FV30XHZp", "title": "An application of scaling to correct range dependent bias in radar rainfall estimates", "abstract": "", "keywords": [ "power law", "weather radar", "cumulative distribution function" ], "authors": [ { "name": "siriluk chumchean", "org": "" }, { "name": "alan w seed", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2003 }, "7YKsvG0k": { "id": "7YKsvG0k", "title": "Identification of Predictors for a Daily Rainfall Simulation Model", "abstract": "", "keywords": [ "commissioning", "academic research", "publishing" ], "authors": [ { "name": "timothy i harrold", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "simon j sheather", "org": "" } ], "venue": "", "year": 2000 }, "gbIVL6eq": { "id": "gbIVL6eq", "title": "An operational approach for classifying storms in real-time radar rainfall estimation", "abstract": "This paper presents an operational approach to integrate a storm classification method into a real-time radar rainfall estimation. A minor modification of a texturing classification algorithm proposed by Steiner et al. [Steiner, M., Houze Jr., R.A., Yuter, S.E., 1995. Climatological characterisation of three-dimensional storm structure from operational radar and rain gauge data. J. Appl. Meteorol. 34, 1978–2007] that can classify each pixel in the radar image as stratiform or convective is used to classify the instantaneous reflectivity field into convective and stratiform components. A method to derive the climatological Z–R relations for convective and stratiform rainfall is proposed. Vertical profiles of reflectivity (VPRs) are used to verify the accuracy of the storm classification. An alternative method for verification of a storm classification scheme based on differences between probability distribution functions of rain gauge rainfall of the two rainfall categories is also presented. A 6-month record of radar and rain gauge rainfall for Sydney, Australia for November 2000–April 2001 is used for training and rainfall events during February 2007–March 2007 are used to evaluate the efficiency and applicability of the proposed methods. The results show that the proposed operational approach for classifying storms in real-time radar rainfall estimates reduces RMSE between radar and rain gauge rainfall from 4.63 to 4.30 mm h −1 and from 5.31 to 5.01 mm h −1 for the training and verification periods compared to the case where the rainfall is assumed to have a single Z–R relationship. Keywords Radar rainfall Storm classification Z–R conversion error Climatological Z–R relations for convective and stratiform rainfall Introduction Radar rainfall is derived by converting measured radar reflectivity ( Z ) into rainfall intensity ( R ) using an appropriate Z–R relationship. To increase the accuracy of radar measurements of rainfall, two broad classes of errors need to be taken into account ( Jordan et al., 2000 ). These are (1) reflectivity measurement errors and (2) errors introduced in the process of converting measured reflectivity to a rainfall rate ( Z–R conversion error). Reflectivity measurement errors include temporal and spatial sampling errors ( Fabry et al., 1994; Jordan et al., 2000 ), height sampling errors that result in a range dependent bias ( Koistinen et al., 1981; Fabry et al., 1994; Kitchen et al., 1994; Andrieu and Creutin, 1995; Fabry and Zawadzki, 1995; Vignal and Andrieu, 1999; Vignal and Krajewski, 2001; Ryzhkov et al., 2005; Gabella et al., 2006; Morin and Gabella, 2007 ), ground clutter ( Collier, 1996; Steiner and Smith, 2002 ), anomalous propagation ( Steiner and Smith 2002 ), beam blocking ( Gabella and Perona, 1998 ), beam attenuation ( Hildebrand 1978 ), electrical calibration error and quantisation of reflectivity error ( Cluckie et al., 1991; Joss and Lee, 1995 ). The Z–R conversion error is an equally important source of error which depends on the model used to convert reflectivity to rainfall. The Z–R relationship is represented by a power law model of the form; Z = AR b where A and b are model parameters which depend on the rainfall drop size distributions (DSDs) that have been sampled, assuming that the terminal velocity of the raindrops is a function of their diameter, and that they are falling at terminal velocity through still air. Joss and Waldvogel (1970) were among the first who pointed out uncertainty in radar rainfall estimates due to drop spectra variability. Recently, Lee and Zawadzki (2006) also showed that the uncertainty in rainfall estimates due to day-to-day variation in DSD, and therefore the Z–R relationship, can be large. They suggested that the variation of the DSD for the day can be reduced by a broad classification of convective and stratiform rainfall or by a more refined classification using polarimetric radar data, if available. Differences between DSDs of convective and stratiform rainfall cause Z–R parameters of these two rainfall types to be significantly different ( Battan, 1973; Tokay and Short, 1996; Atlas et al., 1999 ). The studies of Joss and Waldvogel (1970), Rogers (1971), Battan (1973), Klazura (1981), Austin (1987), Rosenfeld et al. (1992), Rosenfeld et al. (1993), Tokay and Short (1996), Sempere Torres et al. (2000), Uijlenhoet et al. (2003) and Lee and Zawadzki (2005) reported that the Z–R conversion error can be substantially reduced if the parameters of the Z–R relationship are estimated using data that represent the type of events for which the developed relationship will be used. Zawadzki (2006) also mentioned that it is broadly believed that distinct Z–R relationships for the two rainfall types will lead to an improvement in radar rainfall. Nevertheless, he shows examples where Z–R relationships of convective and stratiform precipitation were indistinguishable even though there was variability in the DSDs. Using a single Z–R relation applied universally to all rain fields irrespective of inherent differences in rainfall DSDs can result in erroneous estimates of radar rainfall ( Atlas et al. 1999 ). Consequently, it is recommended that separate Z–R relations be developed for different types of rain fields and available information be used to classify the current rain field into the appropriate type. While the distribution of the physical processes that produce rainfall are far more subtle than is assumed in practice, it is usually classified into the two dominant types – convective and stratiform rainfall. Once classified, the reflectivity corresponding to each rainfall type can be grouped and the appropriate Z–R relations developed. The aim of the paper is to present practical strategies for storm classification and estimation of the Z–R relationships for convective and stratiform rainfall based on gauge and radar data, and to evaluate the impact of such a scheme on radar rainfall estimation errors. The storm classification method applied in this study is a minor modification of the clustering based approach proposed by Steiner et al. (1995) . A procedure for estimating the climatological Z–R relations for convective and stratiform rainfall when only instantaneous radar reflectivity and hourly rain gauge rainfall are available is presented. As our interest lies in using the storm classification method for real-time estimation of rainfall, we present an operational approach that integrates storm classification and consequent estimation of hourly radar rainfall in real-time. The paper is organised as follows; Section ‘Effect of storm type on radar estimates’ discusses an effect of storm types on radar rainfall estimates. Section ‘Existing methods for partitioning convective and stratiform rain fields’ reviews existing methods for partitioning convective and stratiform rainfall. Section ‘Real-time radar estimation based on convective and stratiform Z – R relationships’ describes the procedure for integrating the instantaneous classifications into hourly accumulations so that the hourly rain gauge data can be partitioned. Details on the storm classification scheme used in our study and verification by means of an analysis of the mean VPR and the probability distributions of the gauge accumulations of hourly rainfall for the two classes are also presented in Section ‘Real-time radar estimation based on convective and stratiform Z – R relationships’. Section ‘derivation of Z – R relations for convective and stratiform rainfall’ presents the method to derive climatological Z–R relations for convective and stratiform rainfall and compares the results with those obtained from a single Z–R relationship. Finally, the conclusions from this study are drawn in Section ‘Conclusions’. Effect of storm type on radar rainfall estimates The physical differences between stratiform and convective precipitation can be summarized as follows. Stratiform precipitation is defined to exist when the vertical air motion is weaker than the terminal velocity of snow particles (∼1–2 m s −1 ) ( Locatelli and Hobbs, 1974 ). Alternatively, it can occur as long as the ascent of saturated air is weak enough to allow ice particles to fall out ( Houze, 1997 ). Stratiform precipitation usually falls from the anvils of extensive convective cloud systems, and from large scale uplift driven by synoptic forcing or orography. It is characterized by light to moderate precipitation rates, weak horizontal reflectivity gradients, and the existence of a radar bright band near the melting layer ( Battan, 1973; Houze, 1993 ). In general, radar reflectivity in the bright band region is stronger than in rain below or the snow directly above by about 5–10 dBZ ( Stewart et al., 1984; Klaassen, 1988; Fabry et al., 1992; Williams and Ecklund, 1995 ). Convective precipitation processes contrast sharply from stratiform processes ( Houze, 1993 ). The vertical air motion of this type of precipitation is equal or higher than the fall speeds of the precipitation particle, and is usually characterized by locally strong vertical winds. Radar echoes associated with strong convective updrafts, form well-defined vertical cores of maximum reflectivity, which contrast markedly with the horizontal orientation of the radar bright band seen at the melting layer in stratiform precipitation. The intensity of convective precipitation exhibits strong variability in the horizontal, significantly more than that of stratiform precipitation. For more details on the differences between convective and stratiform rainfall, interested readers are referred to Houze (1993, 1997) and Yuter and Houze (1997) . The DSD of convective and stratiform rainfall is significantly different due to differences in the physical processes of the two rainfall types. Yuter and Houze (1997) used airborne DSD data to investigate the difference in DSD of convective and stratiform rain. They found that the small and large drop spectra do not correspond uniquely to convective and stratiform regions because the stratiform precipitation alone may comprise of large or small drops. Within stratiform precipitation, the same rain rate could be produced by a drop spectrum dominated by numerous small drops (low reflectivity) or by a few large drops (high reflectivity). The large drop spectra within stratiform regions are primarily associated with fallstreaks, which are likely to be the microphysical remnants of deep convective and/or convective overturning in the melting layer. Due to the variability of stratiform drop size spectra, they concluded that a convective–stratiform separation algorithm does not make the distinction and proposed to use a single Z–R for both rainfall types. In contrast, Atlas et al. (2000) used the magnitude of vertical air motion measured by aircraft while measuring the DSD to partition the precipitation types and found that large drop size characterized stratiform rain and small drops were associated with convective rain, on average. They also found a statistically significant difference between the Z–R relations of the two rainfall types by conventional regression methods. Ulbrich and Atlas (2002) used almost the same data set as used by Yuter and Houze (1997) and Atlas et al. (2000) and found that the single PMM Z–R curve derived by Yuter and Houze (1997) is based upon the underlying stratiform and convective PMM relations derived in their work. They concluded that the Z–R relationship for the two rainfall types are statistically significantly different. Reflectivity (in unit of mm 6 m −3 ) and rainfall intensity (mm h −1 ) are theoretically related to the 6th and approximately 3.7th moments of the raindrop diameter, respectively ( Marshall and Palmer, 1948 ). Consequently, radar reflectivity is more sensitive to rain drop diameter rather than rainfall rate and it is possible for the same reflectivity to be produced by samples having different drop size distributions and rainfall intensities. Existing methods for partitioning convective and stratiform rain fields Many studies have proposed methods to partition rainfall from precipitation clouds into convective and stratiform components. A simple threshold method called “ the background-exceedance technique ”, BET ( Austin and Houze, 1972; Houze, 1973 ) was developed to identify areas of convective rainfall using rain gauge data. This method was extended to two-dimensional radar reflectivity by Churchill and Houze (1984) . They assigned a fixed radius of influence to each identified convective core. Tao et al. (1993) applied two additional criteria - a cloud water content and the updraft velocity to Churchill and Houze (1984) method. Xu (1995) proposed the method similar to Churchill and Houze (1984) except that vertical motion instead of the rainfall rate is used as the thresholding mechanism. Steiner et al. (1995) considered that the fixed convective radius as proposed by Churchill and Houze (1984) was insufficient, therefore they proposed a rainfall classification method which used the two-dimensional radar reflectivity and allows variations in the size of the convective radius of influence around each core. While many classification methods involve the use of the threshold logic outlined above, some studies have approached the problem from a different viewpoint. Satellite observed cloud top temperature was used to denote the location of convective cells by Adler and Negri (1988) , the infrared brightness temperature of the core being used to identify the associated radius of influence ( Adler and Mack, 1984). Rosenfeld and Amitai (1995a) formulated an objective methodology to classify rain regimes by factors deemed meaningful to variations in the distributions of rain intensity and radar-observed reflectivity. Relationships between rainfall and three classification parameters (effective efficiency, bright band fraction, and the horizontal radial reflectivity gradients) were derived. The rain intensity distributions were assumed to be controlled primarily by the convection depth and by the nature of the rainfall, whether convective or stratiform. Tokay and Short (1996) proposed an empirical convective–stratiform classification method based on microphysical structure of convective and stratiform clouds. Sempere Torres et al. (2000) presented two classification algorithms to classify types of rainfall: (1) Yuter and Houze (1997) using horizontal reflectivity gradients and (2) Sanchez-Diezma et al. (2000) using a bright band in the VPR as a signature of stratiform rainfall. With these algorithms the radar rainfall field were partitioned into three categories: (i) stratiform rain, defined by the presence of the bright band, (ii) convective rain, identified by the presence of strong horizontal gradients related to active convection and (iii) the absence of a marked characteristic in the rainfall field. Atlas et al. (2000) used airborne measurements of DSD and air motion data to partition convective and stratiform precipitation types. The strength of the vertical air motion in excess of 1 m s −1 either up or down was used as a discriminate. Stronger drafts identified as convective clouds, all others were classified as stratiform. However, this method is not suitable for practical application because it depends on aircraft penetrations of the storm system ( Atlas et al., 2000 ). Biggerstaff and Listemaa (2000) proposed the method that extends the Steiner et al. (1995) technique by using the horizontal and vertical gradients of reflectivity and the bright band fractions as defined by Rosenfeld et al. (1995b) that were obtained from the full three-dimensional volume of reflectivity to correct the original algorithm output. They concluded that their modified algorithm improved the performance of echo classification by correcting two main sources of error including misclassification of: (1) heavy stratiform as convective and (2) convective rain on the periphery of convective cores as stratiform rain. Lang et al. (2003) introduced a new convective–stratiform classification method based on the premise that the terminal fall speed of precipitation particles is large relative to the vertical velocity in regions of stratiform precipitation. Recently, Caracciolo et al. (2006) proposed a convective and stratiform discrimination algorithm based on the knowledge of difference parameters of a gamma DSD of each rainfall type. The goal of a classification scheme in the context of radar rainfall estimation is to reduce the variability of rainfall about the climatological DSD and therefore the climatological Z–R relationship by partitioning the rainfall into a small number of classes that have some physical basis. The classification process is fraught with difficulty and Yuter and Houze (1997) suggest that the separation of Z–R relations for convective and stratiform precipitation is not fully justified and techniques to distinguish between convective and stratiform precipitation based solely on the characteristics of DSDs are likely to be inaccurate. On the contrary, the study of Atlas et al. (1999) showed that the characteristics of the DSD are remarkably consistent within each classification. They concluded that partitioning of rainfall into a sequence of types could be achieved by classification based on the behaviour of the representative drop size (median volume diameter of raindrops) and rain rate. Real-time radar rainfall estimation based on convective and stratiform Z–R relationships According to the steps outlined in Fig. 1 , the first step in estimating radar rainfall in real-time is to formulate appropriate climatological Z–R relations for the two rainfall types. Since the gauge data are hourly accumulations, and the motion of the rain field produces an accumulation at a point on the ground that arises from a mixture of rain types, it is necessary to develop a strategy to identify those hours where the rainfall at a gauge was predominately convective or stratiform and to use these sets of observations to derive the two Z–R relationships. This was done as an offline study by partitioning a long sequence of historical radar reflectivity fields into convective and stratiform pixels using a minor modification of the technique proposed by Steiner et al. (1995) and then calculating the total duration of each classification in each hour by estimating the motion of the reflectivity fields using the technique of Bowler et al. (2004) and simulating a 1-min temporal resolution. It is to be noted that the 1-min rainfall was calculated by assuming that the rain field moves at constant velocity during the sampling interval. Thereafter, the storm velocity for each time interval were computed and then used to simulate a 1-min reflectivity rate by advecting the field observed at the start of the interval towards the field observed at the end of the interval. Once the two Z–R relationships have been estimated, the real-time rainfall estimates are derived by classifying the radar reflectivity field into the two classes, using the appropriate Z–R to convert reflectivity into rain rates, and then converting the instantaneous rain rates into rainfall accumulation by using the motion of the reflectivity field to simulate a 1-min rainfall. Data The 1.5-km constant altitude plan position indicator (CAPPI) data of 20 storms recorded by the Kurnell radar at Sydney, Australia during November 2000–April 2001 and the corresponding hourly rain gauge data obtained from a 254 rain gauge network were used to investigate the climatological Z–R relations of convective and stratiform rainfall. The Kurnell radar transmits radiation with a wavelength of 5.3 cm and has a 3 dB beam width of 0.9°. The reflectivity data are in a Cartesian grid with 256 km × 256 km extent and a 1 km 2 10-min resolution. Rain gauge data used in this study were obtained from a dense network of 254 hourly tipping bucket gauge stations located within 100 km of the radar as shown in Fig. 2 . Eighty five of these stations are owned and operated by the Australian Bureau of Meteorology. Most of these stations have a tipping bucket size of 1.0 mm. The other 169 stations are owned and operated by Sydney Water Corporation. All of these stations have a tipping bucket size of 0.5 mm. The tipping bucket type of rain gauge records the time of bucket tips, hence they are subject to significant quantisation error at low rainfall intensity. Therefore, only the rainfall amounts that are greater than 1 mm h −1 were used in this study. The 1-km CAPPI reflectivity data for 14 rainfall events recorded by the same radar during February 2007–March 2007 and the corresponding rain gauge data obtained from the same rain gauge network were used to evaluate the efficiency and applicability of integrating storm classification method into real-time radar rainfall estimates compared to using a single Z–R relation to all rain fields. Note that while there is a difference in the elevation of the CAPPIs used for training and verification, both elevations are below the climatological level of the bright band and therefore this difference will not affect the results of the analysis. Details of the 34 rainfall events used in this study are summarized in Table 1 . The effects of bright band and a different observation altitude at far range are sources of error that cause the range dependent bias in radar reflectivity. In order to avoid the biases caused by these two sources of error, only the reflectivity and rain gauge data that lie within 100 km from the radar were used in this study. The height of the base scan beam centre at 100 km from the radar is 1.8 km above the ground which can be considered to be not overly different from 1.5 km. In addition, the effect of bright band has also been mitigated by the interpolation scheme that is used to construct the CAPPI data. This has been performed by estimating the VPR using observations within 50 km of the radar and then using this together with the radar beam pattern to calculate the VPR as seen by the radar at the longer ranges. The VPR is subtracted from the observations and Kriging is used to interpolate the residuals down to the CAPPI level which is assumed to be below the level of the bright band. Bias due to the variability in the VPR is thereby minimised in this data set. Sydney has a climate that falls between the temperate and subtropical types. The lower freezing level during the study months is above 2.5 km. Therefore, we consider that the reflectivity data used in this study are free from bright band effect. Attenuation for the C-band radar is considered to be a severe problem when high-intensity rainfall (reflectivity ⩾ 50 dBZ) ( Hildebrand, 1978; Austin, 1987 ) is present. The conditional mean rainfall rate (rainfall > 1 mm h −1 ) of the data used in this study is about 5.1 mm h −1 and the conditional mean of measured reflectivity (reflectivity ⩾ 15 dBZ) is only 26 dBZ. We do not consider the effects of attenuation since we do not want to distract from the main theme of the study which is the use of multiple Z–R relations for real-time radar rainfall estimation, and neglecting it will not alter the conclusions of this paper. The reflectivity that are greater than 53 dBZ were limited to 53 dBZ to mitigate contamination from hail ( Fulton et al. 1998 ). To avoid the effect of noise in the hourly Cartesian radar reflectivity, the reflectivity that are less than 15 dBZ were excluded from the analysis. Classification technique The implementation of the storm classification method proposed by Steiner et al. (1995) is reported in this section. Steiner et al. (1995) proposed a convective–stratiform classification method based on instantaneous radar reflectivity maps. This method is a texture algorithm applied to reflectivity data below the melting layer and builds on earlier work by Churchill and Houze (1984) . Any grid point with reflectivity greater than 40 dBZ (intensity) or any pixel that exceeds the average intensity taken over the surrounding background (within a radius of 11 km) by a specified threshold (peakedness) is labelled as a convective centre. For each of the points identified as convective, a surrounding area that depends on the intensity of the core point is also classified as convective, the radius of this surrounding region being a specified parameter termed as the convective radius. The remaining rainy areas are then classified as stratiform. Steiner et al. (1995) suggested that the peakedness criteria may need to be modified to best distinguish convection for a particular geographic location (precipitation regime) and radar (scanning strategies, beam width, sensitivity, etc.), and the convective radius appears to be primarily a function of grid resolution rather than the precipitation regime. Since this method was originally proposed to classify instantaneous CAPPI reflectivity data for the Darwin radar, Australia, the associated parameters were re-calibrated for use in the instantaneous CAPPI reflectivity data of the Kurnell radar in Sydney, Australia. Two significant rainfall events were selected for training and verification of the classification scheme. The rainfall event that occurred during 19–22 April 2001 was used to calibrate the classification parameters. This event was selected because the appearance of stratiform and convective cells in its instantaneous two-dimensional CAPPI radar reflectivity is readily apparent. Another significant event that occurred during 30–31 January 2001 was used for the validation. It should be noted that the training event used here was carefully analysed to provide a reasonable basis for estimating the parameters of the pixel based classification method. The classification parameters were calibrated using visual interpretation of convective and stratiform cells from instantaneous two-dimensional CAPPI radar reflectivity. The classification criteria for identifying instantaneous convective and stratiform reflectivity were: • Any grid point in the instantaneous radar reflectivity field with reflectivity that exceeds the maximum value of stratiform rainfall in dBZ unit (42 dBZ) is classified as a convective centre. This intensity threshold was higher than the 40 dbZ threshold proposed by Steiner et al. (1995) . This is possible due to the higher spatial resolution data were used in this study. • Any radar pixel which is not identified as convective centre in the previous step, but which satisfies the following constraint is also identified as a convective centre. (1) Z bg > Z c and Z - Z bg > Δ Z Where Z = reflectivity value in dBZ of a considered pixel, Z bg = mean background reflectivity (dBZ) around the considered pixel which is determined from all echoes (including zero values) obtained from pixels located within 11 km, Z c = minimum convective centre threshold in dBZ; and (2) Δ Z = 10 - Z bg 2 P (3) P = max ( Z c + 2.5 ) 2 10 , 140 It is to be noted that Eqs. (1)–(3) are a modification to Steiner et al. (1995) to account for the minimum convective centre threshold in the classification scheme. Eq. (3) defaults to the Steiner et al. (1995) algorithm when Z c is equal to 40 dBZ. • The convective radius is a function of the mean background echo. The relationship between the convective radius and the mean background reflectivity has been modified from that proposed by Steiner et al. (1995) to be suitable for the data used in this study as presented in Table 2 . The instantaneous pixel classification was performed by following the above steps. Fig. 3 a and b illustrate an example of instantaneous reflectivity field and the classification result of the training event (20 April 2001 at 14:35:01 UTC). It is shown that using the Steiner et al. (1995) procedure with the modified parameters specified above except the minimum convective centre threshold, one over-estimates the extent of the convective area as low reflectivity values are mis-classified as convective. This result corresponds to the study of Lang et al. (2003) who found that the Steiner et al. (1995) method classifies fewer instances of stratiform rain as compared to other methods. The reason for this might be because of the effect of the peakedness criteria which can classify light showers as convective rain. Consequently, an additional classification criterion that aims to address this problem was introduced as presented in Eqs. (1)–(3) . This criterion specifies that for a pixel identified as a convective centre, the mean background reflectivity of the surrounding area within 11 km must exceed a minimum convective centre threshold (35 dBZ), and the difference between reflectivity at convective centre and the background reflectivity must be exceeded by Δ Z as defined in Eq. (2) . Fig. 3 c shows the classification results using the minimum reflectivity threshold for convective centre criteria. It can be seen that the convective area has been reduced significantly and the classified results correspond well with a subjective classification based on two-dimensional CAPPI reflectivity data. Note that, reflectivity of pixels that lie within a convective radius can be any values between 15–53 dBZ. The consistency of the instantaneous reflectivity classification criteria was investigated by applying the proposed criteria to another significant rainfall event that occurred during 30–31 January 2001. Fig. 4 shows an example of the classification result of 30 January 2001 at 12:25:01 UTC using the proposed classification parameters without and with the minimum convective centre threshold. The convective areas of the later case is significantly reduced. Nevertheless, we agree with Biggerstaff and Listemaa (2000) who state that “ for proper classification of precipitation, it is best to use full volumetric data ”. However, we must emphasize that we are interested in an operational classification scheme that is able to assist in partitioning the rainfall into two types once the 3D volume scan data has been interpolated onto a horizontal map at a fixed elevation. Since this is the current design for the Australian QPE system, we have restricted our classification scheme to a 2D approach. Moreover, there are many situations where the full volume scan data are not available for real-time operation, especially in developing countries. Hence, in this study, the VPR data were used solely as a means of validating the modified Steiner et al. (1995) algorithm. The ‘true’ state of the type of rainfall is ascertained based on the raw 3D reflectivity scans. If the bright band is found to be strongly present in the VPR then the pixel is classified as stratiform, else convective. This was attempted by calculating the mean VPRs averaged over pixels classified as convective or stratiform rainfall for each instantaneous radar image. It is to be noted that to reduce the effect of beam smearing the VPR, the mean VPRs of convective or stratiform rainfall were estimated by averaging reflectivity of radar pixels that lie within 70 km from the radar site. The proposed modified pixel based approach was used to classify reflectivity pixel into convective or stratiform components. Fig. 5 a and b show an example of the mean VPRs calculated by averaging reflectivity pixels identified as stratiform or convective rainfall of the training (20 April 2001 at 14:35:01 UTC) and validating (30 January 2001 at 12:25:01 UTC) events, respectively. The appearance of the radar bright band in the mean VPRs calculated from pixels that were identified as stratiform, and the absence of bright band signature in the mean VPRs calculated from pixels identified as convective for the training and validating events ( Fig. 5 a and b), are other indicators that the convective–stratiform classification scheme was performed properly and the classification parameters are consistent. Verification of classification scheme using the VPR In order to give us more confidence on the consistency of the instantaneous reflectivity classification criteria, a different rainfall period from February 2007–March 2007 was used for verification. A significant rainfall event that occurred during 10th February 2007 was selected as an example to illustrate the suitability of the method. Fig. 6 a and b present the classification results for 10th February 2007 at 18:35:01 UTC using the proposed classification parameters without and with the minimum convective centre threshold, respectively. The convective areas for the later case are significantly reduced and the classification results shown in Fig. 6 c correspond well with subjective classification of convective and stratiform regions based on two-dimensional CAPPI reflectivity data. The presence and absence of radar bright band in the mean VPRs of stratiform and convective pixels of 10 February 2007 at 18:35:01 UTC as illustrated in Fig. 5 a and b confirms the consistency in the proposed instantaneous reflectivity classification criteria. However, for situations where the 3D volume scan data are not available, the pixel classification will suffer from the lack of a quantitative verification step, the classification parameters being specified based on judgement and understanding of the different rainfall types as they are known to occur in the study region only. To address this verification problem, an alternative method to verify the convective–stratiform storm classification scheme using information from ground rainfall data is presented. Details on the validation procedure, and the results obtained, are presented next. Verification of storm classification using hourly rain gauge observations The physical differences between stratiform and convective precipitation lead to differences in rainfall DSDs and hence ground rainfall intensities for these two rainfall types. Consequently, distinctions between probability distribution functions (PDFs) of point ground rainfall for the two rainfall types are to be expected. The study of Atlas et al. (1999) showed that the characteristics of the DSD are remarkably consistent within each classification. Therefore, it is hypothesised here that for the same rainfall characteristics, the PDFs of convective and stratiform gauge rainfall for the training and verification rainfall periods used should be consistent and reflective of the differences in the mechanisms that lead to each. An added verification of the storm classification method proposed here can then be performed by comparing the PDFs of convective and stratiform gauge rainfall (or the ground rainfall over the pixels classified as convective or stratiform). The method to classify point hourly gauge rainfall as convective or stratiform is presented below. Classification of point hourly gauge rainfall as convective or stratiform To classify hourly gauge rainfall as convective or stratiform, a classification strategy based on the radar reflectivity data that accounts for the hourly time step at which the ground rainfall is available needs to be devised. The instantaneous pixel classification criteria presented in the Section ‘Classification technique’ was used to classify instantaneous reflectivity pixels into convective and stratiform rainfall. Thereafter, the fraction of time classified as convective or stratiform for each the instantaneous reflectivity pixel was accumulated to an hourly scale, hereafter referred as the “ one-hour convective or stratiform period ”. Examples of this period are presented in Fig. 7 a and b. Note that, the one-hour convective and stratiform period for each radar pixel shown in Fig. 7 accounted for the movement of rainfall field between the instantaneous rainfall intensity produced by the radar using the method of Fabry et al. (1994) . This method assumes that the rain field moves at constant velocity during the sampling interval. The storm velocity was first computed for each time interval and then used to simulate a 1-min reflectivity rate by advecting the field observed at the start of the interval towards the field observed at the end of the interval. The pixel classification was performed for each simulated 1-min radar image, and then the convective–stratiform period over an hour was ascertained. If the one-hour convective or stratiform period exceeded 60% of the duration (1 h), that radar pixel and the corresponding hourly rain gauge rainfall was considered as either convective or stratiform, else as “mixed”. Since the movement of rainfall fields has been integrated into the proposed hourly storm classification algorithm, this algorithm can then be considered to account for spatial and temporal variation of rainfall types within an hour. After the hourly rain gauge rainfall data are separated into convective and stratiform components, the PDFs of convective and stratiform rain gauge rainfall can then be formulated. Comparison of the probability distributions of convective and stratiform hourly gauge rainfall Gauge rainfall for the training period (November 2000–April 2001) were classified into convective and stratiform components using the method described above. The resulting PDF [estimated using a nonparametric kernel density procedure as detailed in Bowman and Azzalini (1997) ] for each rainfall type is illustrated in Fig. 8 . It is evident that the PDFs for convective and stratiform gauge rainfall are significantly different. The stratiform rainfall exhibits reduced variability with a mode falling at 1.2 mm h −1 while the convective rainfall exhibits much higher variability and has a mode at 2.7 mm h −1 . The greater variability in convective rainfall is expected and possibly a result of the higher variability in convective storms in the horizontal both within and across the storm events. One would expect the above PDFs to be similar to those ascertained for a non-training period if the classification logic is consistent. Fig. 9 presents the distributional characteristics of gauge convective and stratiform rainfall over an independent validation period. The similarity of the PDFs to those ascertained over the training period are an added verification of the classification logic proposed here. Once hourly rain gauge rainfall has been classified as either convective or stratiform then the next step is to formulate appropriate Z–R relations for each storm type. Details of estimation of climatological Z–R relations for convective and stratiform rainfall are presented below. Derivation of Z–R relations for convective and stratiform rainfall This section presents the approach used to derive appropriate climatological Z–R for convective and stratiform rainfall when only instantaneous radar reflectivity and hourly rain gauge data are available. A classification algorithm that is able to classify each hourly rain gauge rainfall as either convective or stratiform components is required to partition hourly rain gauge data into convective or stratiform components. This can be performed using the method explained in earlier sections. The initial instantaneous radar rainfall is obtained by converting instantaneous radar reflectivity into rainfall intensity using a climatological Z–R relation, ( Z = 103 R 1.5 ). This Z–R relation was derived by optimizing parameter A to minimize Mean Square Error (MSE) between radar and rain gauge rainfall with fixed parameter b . The radar reflectivity data of the training rainfall period (November 2000–April 2001) that were between 15 and 53 dBZ and the corresponding hourly rain gauge rainfall data that were greater than 1 mm h −1 were used for deriving the climatological Z–R ralationship. The instantaneous fields of radar rainfall intensity are then accumulated to a hourly scale using the accumulation algorithm detailed in Fabry et al. (1994) which accounts for movement of rainfall fields within each hour. Thereafter, the hourly radar rainfall is converted back to hourly reflectivity using the same climatological Z–R relationship. Each hourly reflectivity pixel is identified as either convective, stratiform or a mixed classification depending on the fraction of time classified as convective or stratiform using the procedure described in Section ‘Classification of point hourly gauge rainfall as convective or stratiform’. Finally, the two sets of hourly convective and stratiform gauge rainfall and hourly radar rainfall are formed and used to formulate climatological Z–R relations for each rainfall type. The reflectivity data for 20 events during November 2000–April 2001 and the corresponding hourly rain gauge data from a 254 rain gauge network were separated into convective and stratiform components using the method described above, and climatological Z–R relations for convective and stratiform rain estimated. Doelling et al. (1998), Steiner and Smith (2000) and Hagen and Yuter (2003) investigated an appropriate value of the b parameter using several years of reflectivity data measured by disdrometer. They found that the value of 1.5 was suitable to represent the b parameter in the Z–R relation. Seed et al. (2002) also shows that the root-mean-square error (RMSE) of radar rainfall estimates is quite insensitive to the value of b over the range ( b = 1.6, 1.5 and 1.4). Therefore, in this study the b parameter of the Z–R relation was fixed equal to 1.5 while the A parameter was ascertained by minimising the MSE between gauge and radar rainfall estimates. The resulting climatological Z–R parameters for convective, stratiform and no-classification cases are presented in Table 3 . It is to be mentioned that the parameter A obtained from this study is quite low due to the absolute calibration of the radar. The result illustrated in Table 3 is evidence that the A parameters of climatological convective, stratiform and no-classification rainfall are significantly different from each other. The A parameter for convective rainfall is higher than for stratiform and the no-classification rain, as would be expected for the case where the actual radar measurement of Z has been used to derive the Z–R relationships for convective and stratiform rainfall ( Amitai 2000 ). The results from this study also correspond well with those of Arai et al. (2005) who estimated the Z–R relations using Rayleigh and Mie scattering assumptions in the rain types and found that the prefactor in the thunderstorm ( A parameter) was larger than that in the stratiform rainfall, while the exponent was ( b parameter) not significantly different ( b = 1.5 and 1.48 for stratiform and thunderstorm rainfall, respectively). This result also agrees with the coefficients of Z–R relations analyzed by Uijlenhoet (2001) . It is to be noted that the A parameter might be sensitive to the objective function used to minimize the discrepancy between radar and rain gauge rainfall. Minimizing different objective functions rather than MSE may result in different A parameter. The proposed instantaneous classification method was used to classify the 20 events that occurred during November 2000–April 2001 into an assortment of convective or stratiform pixels. Thereafter the climatological Z–R relations for convective and stratiform rainfall presented in Table 3 were used to convert the instantaneous convective and stratiform reflectivity into radar rainfall intensity. Finally, the instantaneous radar rainfall was accumulated to an hourly timestep. The results for the training period are presented in Table 4 . It is evident that using climatological convective and stratiform Z–R relations reduces RMSE in radar rainfall estimates from 4.63 to 4.30 mm h −1 when compared to using a single climatological Z – R . It should be emphasized that the main intention of this study is to reduce error in real-time radar rainfall estimates due to variation of Z–R relations of convective and stratiform. Therefore, the results presented here do not attempt to eliminate the mean field bias in the radar rainfall field and represent specifically the improvements likely because of the storm classification procedure. More significant improvements will result if consideration is given to real-time bias correction and the discrepancy in the spatial scales being used to compare radar rainfall results (point gauge data is used instead of a grid) ( Kitchen et al., 1994; Anagnostou et al., 1999; Ciach and Krajewski, 1999; Habib and Krajewski, 2002; Chumchean et al., 2006a ). The Z–R relations for convective and stratiform rainfall derived from the training rainfall period were used to convert instantaneous reflectivity into convective or stratiform components for the second data set. The RMSEs attained by using a single climatological Z–R relation and climatological convective and stratiform Z–R relations are presented in Table 5 . Using the classification based Z–R relations reduces RMSE from 5.31 to 5.01 mm h −1 when compared to the use of a single climatological relationship. Conclusions This study evaluated the impact of partitioning a radar reflectivity field into convective and stratiform rainfall and then using two Z–R relations to convert reflectivity into rainfall. The main conclusions from this study are as follows: 1. The climatological A parameter for the Z–R relations for no-classification, convective and stratiform rainfall cases, were significantly different. The A parameter for convective rainfall was significantly greater than that for stratiform rainfall, as expected for the case where the actual radar measurement of Z has been used to derive the Z–R relationships for convective and stratiform rainfall. 2. The probability distributions for the hourly gauge data partitioned into convective and stratiform rainfall were significantly different to each other, with the former exhibiting higher variability and mean than the latter. 3. In cases where 3D volume scan data is not available, it is possible to verify the convective–stratiform classification scheme based on gauge rainfall measurements. A sensible check that the scheme works would be to ensure that the gauge classified rainfalls exhibit similar distributional characteristics in both the training and validation periods used. 4. Use of separate Z–R relations for each rainfall type improved the accuracy of resulting estimates by a rather modest 5–10%. Finally, it must be reemphasized that the hourly radar rainfall that has been estimated by accounting for the variation of Z–R relations of convective and stratiform rainfall still needs further adjustment by correcting for any bias that might exist in the initial radar rainfall estimates. 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Houze Jr. S.E. Yuter Climatological characterisation of three-dimensional storm structure from operational radar and rain gauge data J. Appl. Meteorol. 34 1995 1978 2007 Stewart et al., 1984 R.E. Stewart J.D. Marwitz J.C. Pace Characteristics through the melting layer of stratiform clouds J. Atmos. Sci. 41 1984 3227 3237 Tao et al., 1993 W.-K. Tao J. Simpson C.-H. Sui B. Ferrier S. Lang J. Scala M.-D. Chou K. Pickering Heating, moisture, and water budgets of tropical and mid latitude squall lines: comparisons and sensitivity to long wave radiation J. Atmos. Sci. 50 1993 673 690 Tokay and Short, 1996 A. Tokay D.A. Short Evidence from tropical raindrop spectra of the origin of rain from stratiform versus convective clouds J. Appl. Meteorol. 35 1996 355 371 Uijlenhoet, 2001 R. Uijlenhoet Raindrop size distributions and radar reflectivity–rain rate relationships for radar hydrology Hydrol. Earth Syst. Sci. 5 4 2001 615 627 Uijlenhoet et al., 2003 R. Uijlenhoet M. Steiner J.A. Smith Variability of raindrop size distribution in a squall line and implication for radar rainfall estimation J. Hydrometeorol. 4 2003 43 61 Ulbrich and Atlas, 2002 C.W. Ulbrich D. Atlas On the separation of tropical convective and stratiform rains J. Appl. Meteorol. 41 2002 188 195 Vignal and Andrieu, 1999 B. Vignal H. Andrieu Identification of vertical profiles of reflectivity from volume scan radar J. Appl. Meteorol. 38 1999 1214 1228 Vignal and Krajewski, 2001 B. Vignal W.F. Krajewski Large-sample evaluation of two methods to correct range-dependent error for WSR-88D rainfall estimates J. Hydrometeorol. 2 2001 490 504 Williams and Ecklund, 1995 C.R. Williams W.L. Ecklund Classification of precipitation clouds in the tropics using 915-MHz wind profiles J. Appl. Meteorol. 12 1995 996 1012 Xu, 1995 K.-W. Xu Partitioning mass, heat, and moisture budgets of explicitly simulated cumulus ensembles into convective and stratiform components J. Atmos. Sci. 30 1995 1 23 Yuter and Houze, 1997 S.E. Yuter RA. Houze Jr. Measurements of raindrop size distributions over the pacific warm pool and implications for Z – R relations J. Appl. Meteorol. 36 1997 847 867 Zawadzki, 2006 Zawadzki, I., 2006. Sense and Nonsense in radar QPE. In: Proceeding of 4th European Conference on Radar in Meteorology and Hydrology, Barcelona, Spain, pp. 126–129.", "keywords": [ "real time" ], "authors": [ { "name": "Siriluk Chumchean", "org": "Department of Civil Engineering, Mahanakorn University of Technology, 51 Cheum-Sampan Rd., Nong Chok, Bangkok 10530, Thailand" }, { "name": "Alan Seed", "org": "Centre for Australian Weather and Climate Research, Bureau of Meteorology, GPO Box 1289K, Melbourne, VIC 3001, Australia" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2008 }, "OT3K9DnN": { "id": "OT3K9DnN", "title": "Reduced spatial extent of extreme storms at higher temperatures", "abstract": "Extreme precipitation intensity is expected to increase in proportion to the water-holding capacity of the atmosphere. However, increases beyond this expectation have been observed, implying that changes in storm dynamics may be occurring alongside changes in moisture availability. Such changes imply shifts in the spatial organization of storms, and we test this by analyzing present-day sensitivities between storm spatial organization and near-surface atmospheric temperature. We show that both the total precipitation depth and the peak precipitation intensity increases with temperature, while the stormu0027s spatial extent decreases. This suggests that storm cells intensify at warmer temperatures, with a greater total amount of moisture in the storm, as well as a redistribution of moisture toward the storm center. The results have significant implications for the severity of flooding, as precipitation may become both more intense and spatially concentrated in a warming climate.", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Seth Westra", "org": "School of Civil, Environmental and Mining Engineering University of Adelaide Adelaide South Australia Australia" } ], "venue": "Geophysical Research Letters", "year": 2016 }, "8QDQTdLe": { "id": "8QDQTdLe", "title": "Predicting hydrologic response through a hierarchical catchment knowledgebase: A Bayes empirical Bayes approach: A BAYES EMPIRICAL BAYES APPROACH", "abstract": "", "keywords": [], "authors": [ { "name": "tyler smith", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2014 }, "hRfv0Xde": { "id": "hRfv0Xde", "title": "Catchment Specification Using Mixture of Models", "abstract": "", "keywords": [ "commissioning", "academic research", "publishing" ], "authors": [ { "name": "rajiv mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2009 }, "hBxDwr59": { "id": "hBxDwr59", "title": "Statistical ENSO forecasting with subsurface ocean temperatures as predictors", "abstract": "", "keywords": "", "authors": [ { "name": "Jose Eric Ruiz", "org": "" }, { "name": "Ian Cordery", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Australian journal of water resources", "year": 2005 }, "CRgHGfCe": { "id": "CRgHGfCe", "title": "Hydrologic Model Selection using Markov chain Monte Carlo methods", "abstract": "", "keywords": [ "probability distribution", "bayesian approach", "bayesian statistics", "sampling technique", "markov chain monte carlo", "autoregressive process", "posterior distribution", "random sampling", "model error" ], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "", "year": 2002 }, "CjjgwEYN": { "id": "CjjgwEYN", "title": "A volume law for specification of linear channel storage for estimation of large floods", "abstract": "", "keywords": [ "catchment hydrology", "estimation", "properties", "channels", "mathematical models", "linear system", "river basin" ], "authors": [ { "name": "Shangyou Zhang", "org": "" }, { "name": "Ian Cordery", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2000 }, "FR2wqbJg": { "id": "FR2wqbJg", "title": "An Investigation of the Nature of Variability in Australian Rainfall Using Wavelets", "abstract": "", "keywords": [ "academic research", "publishing", "commissioning" ], "authors": [ { "name": "seth westra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2005 }, "YRieJpQf": { "id": "YRieJpQf", "title": "Modeling the catchment via mixtures: Issues of model specification and validation", "abstract": "One way to reduce predictive uncertainty due to the model structure is to incorporate information from several different models at once. Model aggregation can lead to a better prediction than a single model structure, as each model provides new information about the processes that are occurring. This paper presents an alternative by further developing an idea introduced by Marshall et al. (2006). A modeling framework that combines a number of individual model structures is presented. The approach, known as the hierarchical mixtures of experts (HME) framework, allows for a more sophisticated method of model aggregation by allowing individual models to be selected based on the preceding catchment conditions and also gives greater flexibility to the specification of the model errors. The modeling framework was previously shown to have potential as a modeling tool for assessing model components and identifying structural deficiencies in existing representations. This paper presents a basis for using the HME rainfall-runoff modeling framework for prediction or simulation. We illustrate the rationale behind the proposed framework using daily rainfall, evapotranspiration, and flow data from two small sized catchments (<150 km2) in the state of New South Wales, Australia. Two different forms of a conceptual rainfall-runoff model are used to represent the multiple component models of the framework. We investigate the usefulness of different catchment predictors to weight the individual models by assessing the resulting performance in a predictive sense. The usefulness of alternative models for the description of the model errors is shown. The study shows that given careful comparison of the possible mechanisms related to a switch in the catchment “state,” the proposed approach can be a useful predictive tool, giving an aggregated model simulation that is better than any individual model.", "keywords": [ "bayesian", "model aggregation", "uncertainty", "bayesian model", "hydrological modelling", "model error", "statistical model", "dynamic system", "model specification", "evapotranspiration", "component model" ], "authors": [ { "name": "Lucy Marshall", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "David Nott", "org": "" } ], "venue": "Water Resources Research", "year": 2006 }, "Qn6qsCUI": { "id": "Qn6qsCUI", "title": "A new framework for monitoring flood inundation using readily available satellite data: AN ASSESSMENT OVER AUSTRALIA", "abstract": "", "keywords": "", "authors": [ { "name": "Robert M. Parinussa", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Venkat Lakshmi", "org": "Department of Earth and Ocean Sciences; University of South Carolina; Columbia South Carolina USA" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" } ], "venue": "Geophysical Research Letters", "year": 2016 }, "mh4AbSoc": { "id": "mh4AbSoc", "title": "Applications of Bayesian Methods in Conceptual Rainfall-runoff Modelling", "abstract": "", "keywords": [ "commissioning", "academic research", "publishing" ], "authors": [ { "name": "lucy marshall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "", "year": 2002 }, "GyKvLFFj": { "id": "GyKvLFFj", "title": "A quasi-global assessment of changes in remotely sensed rainfall extremes with temperature: Remotely Sensed Extreme Rainfall Scaling", "abstract": "", "keywords": "", "authors": [ { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Robert M. Parinussa", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering; University of New South Wales; Sydney New South Wales Australia" } ], "venue": "Geophysical Research Letters", "year": 2016 }, "m2RHlb7l": { "id": "m2RHlb7l", "title": "Accounting for interannual variability: A comparison of options for water resources climate change impact assessments", "abstract": "Scaling approaches do not allow for changes in variability in the futureBias correction methods can be defined to allow changes in a range of statisticsUsing a range of methods can address limitations in the different approaches", "keywords": [ "interannual variability", "bias correction", "water resources", "climate change", "scaling" ], "authors": [ { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia,Now at Climate and Water Division, Bureau of Meteorology, Darlinghurst, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" } ], "venue": "Water Resources Research", "year": 2011 }, "I9uxMPhm": { "id": "I9uxMPhm", "title": "Evaluating regional climate models for simulating sub-daily rainfall extremes", "abstract": "Sub-daily rainfall extremes are of significant societal interest, with implications for flash flooding and the design of urban stormwater systems. It is increasingly recognised that extreme subdaily rainfall will intensify as a result of global temperature increases, with regional climate models (RCMs) representing one of the principal lines of evidence on the likely magnitude and spatiotemporal characteristics of these changes. To evaluate the ability of RCMs to simulate subdaily extremes, it is common to compare the simulated statistical characteristics of the extreme rainfall events with those from observational records. While such analyses are important, they provide insufficient insight into whether the RCM reproduces the correct underlying physical processes; in other words, whether the model “gets the right answers for the right reasons”. This paper develops a range of metrics to assess the performance of RCMs in capturing the physical mechanisms that produce extreme rainfall. These metrics include the diurnal and seasonal cycles, relationship between rainfall intensity and temperature, temporal scaling, and the spatial structure of extreme rainfall events. We evaluate a high resolution RCM—the Weather Research Forecasting model—over the Greater Sydney region, using three alternative parametrization schemes. The model shows consistency with the observations for most of the proposed metrics. Where differences exist, these are dependent on both the rainfall duration and model parameterization strategy. The use of physically meaningful performance metrics not only enhances the confidence in model simulations, but also provides better diagnostic power to assist with future model improvement.", "keywords": [ "Regional climate models", "Climate model evaluation", "Sub-daily extreme rainfall", "Weather Research Forecasting (WRF) model", "Greater Sydney region" ], "authors": [ { "name": "virginia edith corteshernandez", "org": "university of adelaide" }, { "name": "feifei zheng", "org": "zhejiang university" }, { "name": "jason p evans", "org": "university of new south wales" }, { "name": "martin f lambert", "org": "university of adelaide" }, { "name": "ashish sharma", "org": "university of new south wales" }, { "name": "seth westra", "org": "university of adelaide" } ], "venue": "Climate Dynamics", "year": 2015 }, "ZqDFln2l": { "id": "ZqDFln2l", "title": "Tools for investigating the prior distribution in Bayesian hydrology", "abstract": "Summary Bayesian inference is one of the most popular tools for uncertainty analysis in hydrological modeling. While much emphasis has been placed on the selection of appropriate likelihood functions within Bayesian hydrology, few researchers have evaluated the importance of the prior distribution in deriving appropriate posterior distributions. This paper describes tools for the evaluation of parameter sensitivity to the prior distribution to provide guidelines for defining meaningful priors. The tools described here consist of two measurements, the Kullback-Leibler Divergence (KLD) and the prior information elasticity. The Kullback-Leibler Divergence (KLD) is applied to calculate differences between the prior and posterior distributions for different cases. The prior information elasticity is then used to quantify the responsiveness of the KLD values to the change of prior distributions and length of available data. The tools are demonstrated via a Bayesian framework using an MCMC algorithm for a conceptual hydrologic model with both synthetic and real cases. The results of the application of this toolkit suggest the prior distribution can have a significant impact on the posterior distribution and should be more routinely assessed in hydrologic studies.", "keywords": "", "authors": [ { "name": "Yating Tang", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Lucy Marshall", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Tyler Smith", "org": "Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699, USA" } ], "venue": "Journal of Hydrology", "year": 2016 }, "xRqIZ3QT": { "id": "xRqIZ3QT", "title": "Disaggregating Soil Moisture to Finer Spatial Resolutions - A Comparison of Alternatives", "abstract": "", "keywords": "", "authors": [ { "name": "Hoori Ajami", "org": "Department of Environmental Sciences University of California Riverside Riverside CA USA" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" } ], "venue": "Water Resources Research", "year": 2018 }, "Q6bxuCt5": { "id": "Q6bxuCt5", "title": "How Do Terrestrial Determinants Impact the Response of Water Quality to Climate Drivers?—An Elasticity Perspective on the Water–Land–Climate Nexus", "abstract": "Investigating water–land–climate interactions is critical for urban development and watershed management. This study examined this nexus by elasticity and statistical approaches through the lens of three watersheds: The Yukon, Mekong and Murray. Here, this study reports the fundamental characteristics, explanations and ecological and management implications of terrestrial determinant influence on the response of water quality to climate drivers. The stability of the response, measured by climate elasticity of water quality (CEWQ), is highly dependent on terrestrial determinants, with strong impacts from anthropogenic biomes and low impacts from surficial geology. Compared to temperature elasticity, precipitation elasticity of water quality is more unstable due to its possible linkages with many terrestrial determinants. Correlation and linear models were developed for the interaction system, which uncovered many interesting scenarios. The results implied that watersheds with a higher ratio of rangeland biomes have a lower risk of instability as compared to watersheds with a higher proportion of dense settlement, cropland and forested biomes. This study discusses some of the most essential pathways where instability might adversely affect CEWQ parameters and recommends suggestions for policy makers to alleviate the instability impacts to bring sustainability to the water environment.", "keywords": "", "authors": [ { "name": "Afed U. Khan", "org": "" }, { "name": "Jiping Jiang", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Peng Wang", "org": "" }, { "name": "Jehanzeb Khan", "org": "" } ], "venue": "Sustainability", "year": 2017 }, "bJeNp5il": { "id": "bJeNp5il", "title": "Development of a formal likelihood function for improved Bayesian inference of ephemeral catchments", "abstract": "The application of formal Bayesian inferential approaches in hydrologic modeling is often criticized for requiring explicit assumptions to be made about the distribution of the errors via the likelihood function. These assumptions can be adequate in some situations, but often little attention is paid to the selection of an appropriate likelihood function. This paper investigates the application of Bayesian methods in modeling ephemeral catchments. We consider two modeling case studies, including a synthetically generated data set and a real data set of an arid Australian catchment. The case studies investigate some typical forms of the likelihood function which have been applied widely by previous researchers, as well as introducing new implementations aimed at better addressing likelihood function assumptions in dry catchments. The results of the case studies indicate the importance of explicitly accounting for model residuals that are highly positively skewed due to the presence of many zeros (zero inflation) arising from the dry spells experienced by the catchment. Specifically, the form of the likelihood function was found to significantly impact the calibrated parameter posterior distributions, which in turn have the potential to greatly affect the uncertainty estimates. In each application, the likelihood function that explicitly accounted for the nonconstant variance of the errors and the zero inflation of the errors resulted in (1) equivalent or better fits to the observed discharge in both timing and volume, (2) superior estimation of the uncertainty as measured by the reliability and sharpness metrics, and (3) more linear quantile-quantile plots indicating the errors were more closely matched to the assumptions of this form of the likelihood function.", "keywords": [ "error model", "bayesian inference", "markov chain monte carlo", "ephemeral catchment", "likelihood", "rainfall-runoff model", "bayesian method", "posterior distribution", "likelihood function" ], "authors": [ { "name": "Tyler Smith", "org": "Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana, USA,School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Lucy Marshall", "org": "Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana, USA" }, { "name": "Raj Mehrotra", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales, Australia" }, { "name": "Scott Sisson", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales, Australia" } ], "venue": "Water Resources Research", "year": 2010 }, "cAP9XQLZ": { "id": "cAP9XQLZ", "title": "The Role of Floodplain Topography in Deriving Basin Discharge Using Passive Microwave Remote Sensing", "abstract": "", "keywords": "", "authors": [ { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental EngineeringUniversity of New South Wales Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental EngineeringUniversity of New South Wales Sydney New South Wales Australia" } ], "venue": "Water Resources Research", "year": 2019 }, "QB01ti0m": { "id": "QB01ti0m", "title": "A semi-parametric model for stochastic generation of multi-site daily rainfall exhibiting low-frequency variability", "abstract": "A semi-parametric stochastic modeling framework for generation of daily rainfall at multiple locations is presented. The proposed framework represents longer-term variability and low-frequency features such as drought, while still simulating other daily key distributional and dependence attributes present in the observed rainfall record with sufficient spatial coherency. The rainfall occurrences at individual sites are simulated using a two-state, first-order Markov model. The transition probabilities of the Markov model are modified by using “aggregate” predictor variables that are indicative of how wet it has been over a period of time. The rainfall amounts on the simulated wet days are generated using a nonparametric kernel density estimation approach. Multisite spatial correlations in the rainfall occurrences and amounts series are represented by driving the single-site models with spatially correlated random numbers. The model is applied on a network of 30 raingauge stations around Sydney in eastern Australia. The analyses of results show that the model is capable of reproducing daily and higher time-scale key spatial and temporal characteristics of rainfall desired in most hydrologic applications.", "keywords": [ "markov model", "low-frequency rainfall characteristics", "kernel density estimation", "longer-term aggregated variables", "nonparametric", "weather generator", "multisite rainfall", "spatial correlations", "transition probability", "first order", "spatial correlation", "key distribution", "low frequency", "kernel density estimate", "stochastic model" ], "authors": [ { "name": "R. Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "The University of New South Wales, Civil and Environmental Engineering, Kensington, Sydney, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2007 }, "d9oChKFg": { "id": "d9oChKFg", "title": "Development and Application of a Multisite Rainfall Stochastic Downscaling Framework for Climate Change Impact Assessment", "abstract": "The coarse resolution of general circulation models (GCMs) necessitates use of downscaling approaches for transfer of GCM output to finer spatial resolutions for climate change impact assessment studies. This paper presents a stochastic downscaling framework for simulation of multisite daily rainfall occurrences and amounts that strive to maintain persistence attributes that are consistent with the observed record. At site, rainfall occurrences are modeled using a modified Markov model that modifies the transition probabilities of an assumed Markov order 1 rainfall occurrence process using exogenous atmospheric variables and aggregated rainfall attributes designed to provide longer-term persistence. At site rainfall amounts on wet days are modeled using a nonparametric kernel density simulator conditional on previous time step rainfall and selected atmospheric variables. The spatial dependence across the rainfall occurrence and amounts is maintained through spatially correlated random numbers and atmospheric variables that are common across the stations used. The proposed framework is developed using the current climate (years 1960–2002) reanalysis data and rainfall records at a network of 45 rain gauges near Sydney, Australia, while atmospheric variable simulations of the CSIRO Mk3.0 GCM (corresponding to Intergovernmental Panel on Climate Change (IPCC) Special Report on Emission Scenarios (SRES) B1, A1B and A2 emission scenarios) are used for downscaling of rainfall for the current and future (year 2070) climate conditions. Results of the study indicate wetter autumn and summer and drier spring and winter conditions over the region in a warmer climate. The best estimates of annual rainfall project little change in the number of wet days and slight increase (2% in 2070) in the rainfall amount. An increase (about 4%) in daily rainfall intensity (rain per wet day) is estimated in year 2070. Changes in rainfall intensity, wet and dry spells, and rainfall amount in wet spells suggest that the future rainfall regime will have longer dry spells interrupted by heavier rainfall events.", "keywords": [ "stochastic downscaling", "multisite rainfall", "low-frequency variability", "climate change", "rainfall extremes", "spatial correlation", "low frequency", "markov model", "spatial dependence", "spatial resolution", "general circulation model", "kernel density", "transition probability" ], "authors": [ { "name": "R. Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2010 }, "vfX11jss": { "id": "vfX11jss", "title": "Simulating rainfall time-series: how to account for statistical variability at multiple scales?", "abstract": "Daily rainfall is a complex signal exhibiting alternation of dry and wet states, seasonal fluctuations and an irregular behavior at multiple scales that cannot be preserved by stationary stochastic simulation models. In this paper, we try to investigate some of the strategies devoted to preserve these features by comparing two recent algorithms for stochastic rainfall simulation: the first one is the modified Markov model, belonging to the family of Markov-chain based techniques, which introduces non-stationarity in the chain parameters to preserve the long-term behavior of rainfall. The second technique is direct sampling, based on multiple-point statistics, which aims at simulating a complex statistical structure by reproducing the same data patterns found in a training data set. The two techniques are compared by first simulating a synthetic daily rainfall time-series showing a highly irregular alternation of two regimes and then a real rainfall data set. This comparison allows analyzing the efficiency of different elements characterizing the two techniques, such as the application of a variable time dependence, the adaptive kernel smoothing or the use of low-frequency rainfall covariates. The results suggest, under different data availability scenarios, which of these elements are more appropriate to represent the rainfall amount probability distribution at different scales, the annual seasonality, the dry-wet temporal pattern, and the persistence of the rainfall events.", "keywords": [ "Rainfall", "Simulation", "Markov chain", "Multiple point statistics", "Long-term", "Time-series" ], "authors": [ { "name": "Fabio Oriani", "org": "Department of Hydrology,Geological Survey of Denmark and Greenland,Copenhagen K,Denmark" }, { "name": "Raj Mehrotra", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,Australia" }, { "name": "Grégoire Mariethoz", "org": "Institute of Earth Surface Dynamics,Université de Lausanne,Lausanne,Switzerland" }, { "name": "Julien Straubhaar", "org": "Centre for Hydrogeology and Geothermics,Université de Neuchâtel,Neuchâtel,Switzerland" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,Australia" }, { "name": "Philippe Renard", "org": "Centre for Hydrogeology and Geothermics,Université de Neuchâtel,Neuchâtel,Switzerland" } ], "venue": "Stochastic Environmental Research and Risk Assessment", "year": 2018 }, "8XUgl91S": { "id": "8XUgl91S", "title": "Influence of reanalysis datasets on dynamically downscaling the recent past", "abstract": "Multiple reanalysis datasets currently exist that can provide boundary conditions for dynamic downscaling and simulating local hydro-climatic processes at finer spatial and temporal resolutions. Previous work has suggested that there are two reanalyses alternatives that provide the best lateral boundary conditions for downscaling over southern Africa. This study dynamically downscales these reanalyses (ERA-I and MERRA) over southern Africa to a high resolution (10 km) grid using the WRF model. Simulations cover the period 1981–2010. Multiple observation datasets were used for both surface temperature and precipitation to account for observational uncertainty when assessing results. Generally, temperature is simulated quite well, except over the Namibian coastal plain where the simulations show anomalous warm temperature related to the failure to propagate the influence of the cold current inland. Precipitation tends to be overestimated in high altitude areas, and most of southern Mozambique. This could be attributed to challenges in handling complex topography and capturing large-scale circulation patterns. While MERRA driven WRF exhibits slightly less bias in temperature especially for La Nina years, ERA-I driven simulations are on average superior in terms of RMSE. When considering multiple variables and metrics, ERA-I is found to produce the best simulation of the climate over the domain. The influence of the regional model appears to be large enough to overcome the small difference in relative errors present in the lateral boundary conditions derived from these two reanalyses.", "keywords": [ "Reanalyses", "Dynamical downscaling", "Lateral boundary conditions", "RCM", "Southern Africa" ], "authors": [ { "name": "Ditiro B. Moalafhi", "org": "School of Civil and Environmental Engineering,University of New South Wales,Kensington, Sydney,Australia" }, { "name": "Jason P. Evans", "org": "Climate Change Research Centre,University of New South Wales,Sydney,Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering,University of New South Wales,Kensington, Sydney,Australia" } ], "venue": "Climate Dynamics", "year": 2017 }, "WY5c5jpY": { "id": "WY5c5jpY", "title": "A new method for verification of delineated channel networks", "abstract": "", "keywords": [], "authors": [ { "name": "zhe liu", "org": "nust school of civil and environmental engineering" }, { "name": "urooj khan", "org": "nust school of civil and environmental engineering" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2014 }, "CaZRN1US": { "id": "CaZRN1US", "title": "How reliable are GCM simulations for different atmospheric variables?", "abstract": "Considerable variability exists in simulations of the future climate. This variability is caused by differences in the parameterisations across general circulation models (GCMs), the initial conditions used and the different assumptions made as to how emissions will evolve in the future. As a result, there is considerable disagreement between available projections of climate variables, which can be used to quantify the uncertainty each variable exhibits. This leads to the question—which variables (or set of variables) are more reliable for use in climate change impact assessments. This research presents a framework to quantify the relative reliability amongst a range of upper air atmospheric variables. This is made possible by pooling simulations across multiple models, trajectories (scenarios) and initial conditions in a rank-transformed space. A metric named the variable reliability score (VRS) assesses the relative reliabilities across different atmospheric variables on a common scale. The VRS has been applied to calculate the total reliability as well as reliability from each source of uncertainty, namely model, scenarios and initial conditions. This comparison helps to decide if more models, scenarios or ensembles are required for uncertainty analysis of climate change impact assessment.The variables compared include geopotential height and its north-south difference, specific humidity, eastward wind and northward wind, all at the 500 and 850 hPa pressure levels. These variables were chosen based on availability of data and their documented use in previous climate change impact assessment studies worldwide. A regional assessment of VRS over 21 regions around the world shows that though the magnitude of VRS varies spatially, the ranked reliability of the variable rank remains relatively similar. On average, the lowest reliability is associated with geopotential height, whilst wind speeds and the north-south difference of geopotential height have higher reliability.", "keywords": [ "Climate change", "GCM", "Reliability", "VRS", "Regional uncertainty", "Statistically downscaling" ], "authors": [ { "name": "Sajjad Eghdamirad", "org": "Research Center for the Disaster and Science Technology,Korea University,Seoul,South Korea" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering,University of New South Wales,Sydney,Australia" } ], "venue": "Climatic Change", "year": 2017 }, "jSLqfxnM": { "id": "jSLqfxnM", "title": "Reducing Model Structural Uncertainty in Climate Model Projections—A Rank-Based Model Combination Approach", "abstract": "Future changes in monthly precipitation are typically evaluated by estimating the shift in the long-term mean/variability or based on the change in the marginal distribution. General circulation model (GCM) precipitation projections deviate across various models and emission scenarios and hence provide no consensus on the expected future change. The current study proposes a rank/percentile-based multimodel combination approach to account for the fact that alternate model projections do not share a common time indexing. The approach is evaluated using 10 GCM historical runs for the current period and is validated by comparing with two approaches: equal weighting and a non-percentile-based optimal weighting. The percentile-based optimal combination exhibits lower values of RMSE in estimating precipitation terciles. Future (2000-49) multimodel projections show that January and July precipitation exhibit an increase in simulated monthly extremes (25th and 75th percentiles) over many climate regions of the conterminous United States.", "keywords": "", "authors": [ { "name": "R. Das Bhowmik", "org": "North Carolina State Univ, Dept Civil Construct & Environm Engn, Raleigh, NC 27695 USA" }, { "name": "A. Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "A. Sankarasubramanian", "org": "North Carolina State Univ, Dept Civil Construct & Environm Engn, Raleigh, NC 27695 USA" } ], "venue": "JOURNAL OF CLIMATE", "year": 2017 }, "sG8I3Zuj": { "id": "sG8I3Zuj", "title": "Modeling residual hydrologic errors with Bayesian inference", "abstract": "", "keywords": [ "residual error", "bayesian inference" ], "authors": [ { "name": "tyler smith", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "75ClwapU": { "id": "75ClwapU", "title": "Water allocation for multiple uses based on probabilistic reservoir inflow forecasts", "abstract": "", "keywords": "", "authors": [ { "name": "Sankar Arumugam", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Upmanu Lall", "org": "" } ], "venue": "IAHS-AISH publication", "year": 2003 }, "u7VM82nw": { "id": "u7VM82nw", "title": "Modeling multivariable hydrological series: Principal component analysis or independent component analysis?", "abstract": "Summary) The generation of synthetic multivariate rainfall and/or streamflow time series that accurately simulate both the spatial and temporal dependence of the original multivariate series remains a challenging problem in hydrology and frequently requires either the estimation of a large number of model parameters or significant simplifying assumptions on the model structure. As an alternative, we propose a relatively parsimonious two-step approach to generating synthetic multivariate time series at monthly or longer timescales, by first transforming the data to a set of statistically independent univariate time series and then applying a univariate time series model to the transformed data. The transformation is achieved through a technique known as independent component analysis (ICA), which uses an approximation of mutual information to maximize the independence between the transformed series. We compare this with principal component analysis (PCA), which merely removes the covariance (or spatial correlation) of the multivariate time series, without necessarily ensuring complete independence. Both methods are tested using a monthly multivariate data set of reservoir inflows from Colombia. We show that the discrepancy between the synthetically generated data and the original data, measured as the mean integrated squared bias, is reduced by 25% when using ICA compared with PCA for the full joint distribution and by 28% when considering marginal densities in isolation. These results suggest that there may be significant benefits to maximizing statistical independence, rather than merely removing correlation, when developing models for the synthetic generation of multivariate time series.", "keywords": [ "principal component analysis", "independent component analysis", "stochastic hydrology", "mutual information", "time series", "spatial correlation", "statistical independence", "multivariate data", "time series model", "time series analysis" ], "authors": [ { "name": "Seth Westra", "org": "WATER RESOURCES RESEARCH" }, { "name": "Casey Brown", "org": "WATER RESOURCES RESEARCH" }, { "name": "Upmanu Lall", "org": "WATER RESOURCES RESEARCH" }, { "name": "Ashish Sharma", "org": "WATER RESOURCES RESEARCH" } ], "venue": "Water Resources Research", "year": 2007 }, "YEJVMEps": { "id": "YEJVMEps", "title": "A Markov Chain Monte Carlo Algorithm For Assessing Parameter Uncertainty In Conceptual Rainfall Runoff Modelling", "abstract": "", "keywords": [ "posterior distribution", "bayesian statistics", "satisfiability", "ease of use", "markov chain monte carlo" ], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "david j nott", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2002 }, "ExXAbxgd": { "id": "ExXAbxgd", "title": "A Review of Satellite-Derived Soil Moisture and Its Usage for Flood Estimation", "abstract": "Accurate knowledge of the spatiotemporal behavior of soil moisture (SM) can greatly improve hydrological forecasting capability. While ground-based SM measurements exhibit greater accuracy, they tend to be sparse in space and available for limited periods. To overcome this, a viable alternative is space-borne microwave remote sensing because of the near real-time observational capability at the global scale. However, its direct applications have been limited because of the uncertainty associated and the coarse spatial resolution the products are available at. Considering its usefulness and limitations, this paper is intended to provide an extensive review of satellite-derived SM and its applications for assessing flood risk in sparsely gauged or ungauged catchments worldwide. Therefore, we aim to identify and discuss research gaps, and finally propose future research directions for improvement and hydrological applications of these SM products. The paper starts with a brief introduction to satellite-derived SM products and consists of three interdependent focal areas: evaluation, improvement, and application of the satellite SM for flood risk alleviation.", "keywords": [ "Flood", " Soil moisture", " Satellite remote sensing", " Ungauged basins", " Microwave", " Improvements", " Spatial disaggregation" ], "authors": [ { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Runze Zhang", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Hung Pham", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" } ], "venue": "Remote Sensing in Earth Systems Sciences", "year": 2019 }, "eXPz2hiB": { "id": "eXPz2hiB", "title": "A comparative study of Markov chain Monte Carlo methods for conceptual rainfall-runoff modeling", "abstract": "One challenge that faces hydrologists in water resources planning is to predict the catchment's response to a given rainfall. Estimation of parameter uncertainty (and model uncertainty) allows assessment of the risk in likely applications of hydrological models. Bayesian statistical inference provides an ideal means of assessing parameter uncertainty, whereby prior knowledge about the parameter is combined with information from the available data to produce a probability distribution (the posterior distribution) that describes uncertainty about the parameter and serves as a basis for selecting appropriate values for use in modeling applications. Widespread use of Bayesian techniques in hydrology has been hindered by difficulties in summarizing and exploring the posterior distribution. These difficulties have been largely overcome by recent advances in Markov chain Monte Carlo (MCMC) methods that involve Monte Carlo sampling of the posterior distribution. This study compares four MCMC sampling algorithms in the context of rainfall-runoff modeling. The algorithms compared include a conventional Metropolis-Hastings algorithm used previously in hydrological applications which uses a combination of block and single-site updating and an adaptive Metropolis algorithm that has characteristics that are well suited to model parameters with a high degree of correlation and interdependence, as is often evident in hydrological models. In addition to these, two other algorithms are evaluated to clarify the relative importance of updating all model parameters as a block versus updating each parameter one at a time. The MCMC techniques are compared for simplicity, ease of use, statistical efficiency in exploration of the parameter space, and speed of implementation, using 11 years of daily rainfall-runoff data from the Bass river catchment in Australia. The results show that the adaptive Metropolis algorithm is superior in many respects and can offer a relatively simple basis for assessing parameter uncertainty in hydrological modeling studies and that the efficiency of the adaptive algorithm is not solely attributed to the block-updating element of the algorithm.", "keywords": [ "monte carlo markov chain", "rainfall-runoff", "bayesian", "ease of use", "monte carlo sampling", "soil moisture", "markov chain monte carlo", "posterior distribution", "probability distribution", "metropolis hastings algorithm", "metropolis algorithm", "bayesian statistics", "parameter space" ], "authors": [ { "name": "lucy marshall", "org": "university of new south wales" }, { "name": "david j nott", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" } ], "venue": "Water Resources Research", "year": 2004 }, "pnsigEIf": { "id": "pnsigEIf", "title": "Continuous rainfall simulation: 2. A regionalized daily rainfall generation approach: CONTINUOUS RAINFALL: REGIONALIZED DAILY GENERATION", "abstract": "", "keywords": "", "authors": [ { "name": "Rajeshwar Mehrotra", "org": "" }, { "name": "Seth Westra", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Ratnasingham Srikanthan", "org": "" } ], "venue": "Water Resources Research", "year": 2012 }, "Y4NFgVlQ": { "id": "Y4NFgVlQ", "title": "Simulating design rainfall extremes in locations with limited observational records", "abstract": "The prospect of climatic change and its impacts have brought spatial statistics of extreme events into sharper focus. The so-called water bombs or explosive cyclones are predicted to become more frequent in the extra-tropical regions, and, actually, they raise serious concerns in some regions of the Mediterranean area. However, quantitative statistical methods to properly account for the probability of occurrence of these super-extreme events in formerly untouched areas are still lacking. This is due to their rare occurrence and to the limited spatial scale at which these events occur. In order to overcome the lack of data, different studies concerning flood frequency analysis underline the importance of combining local flood data with additional types of information, to improve the quality of the estimation of the exceedance probability for a given discharge. We propose to apply such a kind of approach in extreme rainfall frequency analysis, with the adoption of a Bayesian framework, aimed at combining local gauge information, discontinuous in space and time, with climatic regional information. The identification of this type of hierarchic relationship can complement local information, conditioning the exceedance probability to the large and meso-scale characteristics of the system, allowing the simulation of design rainfall extremes in sites where historical evidence of that hazard is lacking. The Bayesian approach allows us also to keep track of all the uncertainties involved in the prediction process, producing a measure of uncertainty associated to the estimates. The case study refers to a database of daily rainfall measurements extracted from the NOAA GHCN-Daily dataset, recorded during the 20th century by 700 rain gauges distributed in the Mediterranean basin. First, to identify the conditional variables, we analyse the large-scale environment associated with the different intense precipitation systems in the Mediterranean area, exploiting the reanalysis of the European Centre for Medium-Range Weather Forecasts (ERA-20). With the aim to define the hierarchical relationships between the events and their type, we relate the daily precipitation with different parameters both atmospherical and local. Despite the high variability, different climatic configurations that combined with the local morphology and the seasonal condition of the Mediterranean Sea can trigger very intense precipitation events are identified. Once defined the hierarchical relationships, the parameters are calibrated and the methodology is tested on a subset of daily series provided by local authorities, evenly distributed on the whole domain. The results, compared with those obtained with the classic techniques of frequency analysis and spatial interpolation, demonstrate an increased knowledge coming from climate and local factors, ensuring more reliable and accurate spatial assessment of extreme thunderstorm probability", "keywords": "", "authors": [ { "name": "Andrea Libertino", "org": "Polytechnic University of Turin" }, { "name": "Ashish Sharma", "org": "University of New South Wales" }, { "name": "Lucy Marshall", "org": "Montana State University" } ], "venue": "congress on modelling and simulation", "year": 2015 }, "gPyEf715": { "id": "gPyEf715", "title": "A nonparametric model for stochastic generation of daily rainfall occurrence: DAILY RAINFALL OCCURRENCE GENERATION", "abstract": "", "keywords": [], "authors": [ { "name": "timothy i harrold", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "simon j sheather", "org": "" } ], "venue": "Water Resources Research", "year": 2003 }, "5zPTLMAw": { "id": "5zPTLMAw", "title": "Correcting bias in radar Z – R relationships due to uncertainty in point rain gauge networks", "abstract": "", "keywords": [ "spatial variability" ], "authors": [ { "name": "mohammad mahadi hasan", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "fiona johnson", "org": "" }, { "name": "gregoire mariethoz", "org": "" }, { "name": "alan seed", "org": "" } ], "venue": "Journal of Hydrology", "year": 2014 }, "4q1TwRq3": { "id": "4q1TwRq3", "title": "A nesting model for bias correction of variability at multiple time scales in general circulation model precipitation simulations: NESTED BIAS CORRECTION OF GCM", "abstract": "", "keywords": "", "authors": [ { "name": "Fiona Johnson", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2012 }, "1zVdWf39": { "id": "1zVdWf39", "title": "Accounting for interannual variability: A comparison of options for water resources climate change impact assessments: ACCOUNTING FOR INTERANNUAL VARIABILITY", "abstract": "", "keywords": [], "authors": [ { "name": "fiona johnson", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2011 }, "6sXsq1x1": { "id": "6sXsq1x1", "title": "Forecasting streamflows in Australia using the tropical Indo-Pacific thermocline as predictor", "abstract": "Subsurface ocean temperatures in the tropical Indo-Pacific region are used in a regression prediction scheme for the direct prediction of runoff in 48 representative catchments in northern and eastern Australia. The thermocline, represented by the second unrotated principal component of the 20 °C isotherm depth, is coupled with the Niño3 index to form the predictive model. The relevance of the subsurface oceanic information is evaluated by comparing results with two alternatives, both based on the use of sea surface temperatures. Using lags of 6 and 12 months, the three approaches are applied to forecast the runoff for January, April, July and October, each representing the four seasons. The skills of the three prediction schemes are measured and compared using the linear error in probability space (LEPS) score. Consensus hindcasts, which are linear combinations of the three prediction schemes, were also made for all lags and seasons. In terms of skill, the superiority of the thermocline-based model over the other two models is evident in both individual and consensus forecasting experiments. Except for October forecasts at six months lead-time, the thermocline model consistently garnered the largest proportion of stations where it is most skillful. The number of stations with the best forecasts from the thermocline model usually increased when the lead-time was doubled from 6 to 12 months affirming the suitability of the thermocline for long-term projections. In consensus forecasting, the thermocline-based model usually scored the largest weight among the three models. In many instances, this weight was greater than the combined weight of the two SST-based models. Results of the combined forecasting experiment also demonstrated the higher skill of consensus forecasts compared to the skill of forecasts using individual models.", "keywords": [ "el niño southern oscillation", "thermocline", "medium term forecasting", "sea surface temperature", "principal component", "prediction model", "seasonality", "indexation", "el nino southern oscillation" ], "authors": [ { "name": "Jose Eric Ruiz", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ian Cordery", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2007 }, "qV9HZvBQ": { "id": "qV9HZvBQ", "title": "Representing interannual variability in daily rainfall sequences", "abstract": "", "keywords": [ "seasonality", "stochastic process", "simulation model" ], "authors": [ { "name": "timothy i harrold", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "simon j sheather", "org": "" } ], "venue": "", "year": 2002 }, "lX4RMC6N": { "id": "lX4RMC6N", "title": "A comprehensive validation of the SMAP Enhanced Level-3 Soil Moisture product using ground measurements over varied climates and landscapes", "abstract": "Abstract This study presents a comprehensive validation of the Soil Moisture Active Passive (SMAP) mission Enhanced Level-3 radiometer soil moisture (SM) product (Version 2) over 3 years from April 1, 2015 to March 31, 2018 using extensive ground measurements from sparse networks covering a range of physical and climatological regimes. Using a common spatial resolution, soil moisture retrievals from the descending (6:00 AM) and ascending (6:00 PM) overpasses were assessed based on static conditions such as the climate zone, soil property and land cover. Then validation considering performance with respect to dynamic attributes such as soil wetness, vegetation density and land surface temperature was reported. Given the above six parameters are cross-correlated, the quality of the SMAP enhanced products was further evaluated based on pairwise factors. Overall, higher accuracy was noted over zones where the soil organic carbon is low, the vegetation density is relatively sparse, locations in the temperate and arid climate zones, and the mean LST is high. Results also indicate that the descending (AM) and ascending (PM) products exhibit mean temporal correlation over the ground stations equaling 0.667 and 0.651, and mean unbiased root mean square error (ubRMSE) equaling 0.055 and 0.054 m 3 /m 3 respectively which is close to the ubRMSE requirement of the SMAP mission, 0.04 m 3 /m 3 . While the ascending (PM) SM retrievals have been frequently excluded from applications due to its poor performances reported form validation studies, these comparable performances between the two products suggest that the ascending (PM) SM retrievals can be an additional data source. Based on the results here, it can be concluded that there is room for improving the SMAP product especially in areas of the world with very dense vegetation and average to low land surface temperatures.", "keywords": "", "authors": [ { "name": "Runze Zhang", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia" } ], "venue": "Remote Sensing of Environment", "year": 2019 }, "E6jtsY3W": { "id": "E6jtsY3W", "title": "A comparative study of Markov chain Monte Carlo methods for conceptual rainfall-runoff modeling: MCMC METHODS FOR HYDROLOGIC MODELING", "abstract": "", "keywords": [], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "david j nott", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2004 }, "s4oPzsEJ": { "id": "s4oPzsEJ", "title": "A nonparametric weather-state approach for downscaling of multi-site precipitation occurrences", "abstract": "", "keywords": [ "spatial variation", "stochastic process", "hidden markov model", "auto regressive", "point location", "atmospheric circulation" ], "authors": [ { "name": "rajiv mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "", "year": 2004 }, "aGcYHJkV": { "id": "aGcYHJkV", "title": "Bayesian calibration and uncertainty analysis of hydrological models: A comparison of adaptive Metropolis and sequential Monte Carlo samplers: BAYESIAN CALIBRATION AND UNCERTAINTY ANALYSIS", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "rajeshwar mehrotra", "org": "" }, { "name": "l a marshall", "org": "" }, { "name": "scott a sisson", "org": "" }, { "name": "erwin jeremiah", "org": "" } ], "venue": "Water Resources Research", "year": 2011 }, "y08ee9RL": { "id": "y08ee9RL", "title": "Assessment of climate change impacts on reservoir storage reliability, resilience and vulnerability using a Multivariate Frequency Bias Correction approach", "abstract": "", "keywords": "", "authors": [ { "name": "Ha Nguyen", "org": "Water Research Centre, School of Civil and Environmental Engineering The University of New South Wales Sydney NSW Australia" }, { "name": "Rajeshwar Mehrotra", "org": "Water Research Centre, School of Civil and Environmental Engineering The University of New South Wales Sydney NSW Australia" }, { "name": "Ashish Sharma", "org": "Water Research Centre, School of Civil and Environmental Engineering The University of New South Wales Sydney NSW Australia" } ], "venue": "Water Resources Research", "year": 2020 }, "orZ2Gsud": { "id": "orZ2Gsud", "title": "The influence of dependence in characterizing multi-variable uncertainty for climate change impact assessments", "abstract": "", "keywords": "", "authors": [ { "name": "Sajjad Eghdamirad", "org": "School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, South Korea" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Joong Hoon Kim", "org": "School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, South Korea" } ], "venue": "Hydrological Sciences Journal-journal Des Sciences Hydrologiques", "year": 2019 }, "l0AzaMzZ": { "id": "l0AzaMzZ", "title": "Applicability of Hydrologic Response Units in low topographic relief catchments and evaluation using high resolution aerial photograph analysis.", "abstract": "Topography and geomorphology of a catchment are major drivers of runoff generation. In an earlier publication by the authors, a novel approach of delineating Hydrologic Response Units (HRUs) was investigated with reference to high topographic relief catchments. In the present study, this approach is evaluated for low topographic relief catchment and found to be applicable. To verify the proposed HRUs delineation logic, the thresholds derived from the DEM analysis are evaluated here at catchment scale using high resolution aerial photograph analysis and associated site visits. The thresholds derived from the DEM analysis are found in the same range as obtained from the aerial photographs analysis. The adequacy of the HRUs delineation approach is further verified by soil moisture movement modelling across four cross-sections and sensitivity analysis test for one cross-section in the Little River catchment which further supports the application of HRUs delineation approach in low topographic relief catchment. Evaluation of HRUs using high resolution aerial photographs.Extension of HRUs in low topographic relief catchment.Analysis of upslope areas of channel head in the different rock types.Verification of HRUs using soil moisture movement modelling.", "keywords": "", "authors": [ { "name": "Urooj Khan", "org": "" }, { "name": "Narendra Kumar Tuteja", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Stuart Lucas", "org": "" }, { "name": "Brian Murphy", "org": "" }, { "name": "Brian Jenkins", "org": "" } ], "venue": "Environmental Modelling and Software", "year": 2016 }, "b234LcL0": { "id": "b234LcL0", "title": "Can Regional Climate Modeling Capture the Observed Changes in Spatial Organization of Extreme Storms at Higher Temperatures", "abstract": "", "keywords": "", "authors": [ { "name": "Jingwan Li", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "C. Wasko", "org": "" }, { "name": "C. Wasko", "org": "" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Jason P. Evans", "org": "Climate Change Research Centre and ARC Centre of Excellence for Climate Extremes, School of Biological, Environmental and Earth Sciences University of New South Wales Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" } ], "venue": "Geophysical Research Letters", "year": 2018 }, "nbIiVcNB": { "id": "nbIiVcNB", "title": "A framework for combining multiple soil moisture retrievals based on maximizing temporal correlation", "abstract": "", "keywords": [ "soil moisture", "weighting", "linear combination" ], "authors": [ { "name": "seokhyeon kim", "org": "university of new south wales" }, { "name": "r m parinussa", "org": "university of new south wales" }, { "name": "y y liu", "org": "university of new south wales" }, { "name": "fiona johnson", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" } ], "venue": "Geophysical Research Letters", "year": 2015 }, "Ee8x11kd": { "id": "Ee8x11kd", "title": "Correcting of real-time radar rainfall bias using a Kalman filtering approach", "abstract": "This paper presents a method to adjust the mean field bias of radar rainfall estimates in real time. The underlying philosophy for estimation of radar rainfall in real-time used in this study is that the estimated radar rainfall must first be corrected for the reflectivity measurement errors and the Z – R conversion errors based on the physical methods, and thereafter a statistical method is used to remove the average difference (mean field bias) between radar estimates at the rain gauge locations and the corresponding gauge rainfall amounts. Kalman filtering techniques are used as the basis for correcting the mean filed bias in real time. The logarithmic mean field radar rainfall bias is modelled as an Autoregressive order 1 process having a stationary variance. The observation error variance is estimated from a difference between a variance of the observed mean field bias and the stationary variance of the logarithmic bias process. The variance of the observed mean field bias is estimated using a radar rainfall error variance model which depends on (a) the number of rain gauges that measure non-zero rainfall at that hour; (b) the location of these rain gauges; (c) the conditional mean of rain gauge rainfall; and (d) the number of pulses used for reflectivity measurements. A 7-month radar and rain gauge data record from the Kurnell radar in Sydney, Australia are used to test the efficiency of the proposed method. The results shown that the Kalman filtering approach outperforms the use of sample bias correction method when rain gauge density is less than about 1 gauge per 90 km 2 for both climatological and stratiform rainfall, and has a higher accuracy compared to the case where no bias correction is performed, irrespective of the number of rain gauges used in the calibration.", "keywords": [ "mean field bias", "radar calibration", "real-time radar rainfall estimation", "radar rainfall", "measurement error", "real time", "kalman filter", "mean field" ], "authors": [ { "name": "Siriluk Chumchean", "org": "Department of Civil Engineering, Mahanakorn University of Technology, 51 Cheam-Samphan Road, Nong-Chok, Bangkok, Thailand 10530" }, { "name": "Alan Seed", "org": "Bureau of Meteorology Research Centre, The Bureau of Meteorology, GPO Box 1289K, Melbourne, VIC 3001, Australia" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2006 }, "vYdqtdCO": { "id": "vYdqtdCO", "title": "Does improved SSTA prediction ensure better seasonal rainfall forecasts?", "abstract": "", "keywords": [], "authors": [ { "name": "mohammad zaved kaiser khan", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" }, { "name": "rajeshwar mehrotra", "org": "university of new south wales" }, { "name": "andrew schepen", "org": "commonwealth scientific and industrial research organisation" }, { "name": "q j wang", "org": "commonwealth scientific and industrial research organisation" } ], "venue": "Water Resources Research", "year": 2015 }, "fY1CnDF9": { "id": "fY1CnDF9", "title": "An assessment of CMIP5 multi-model decadal hindcasts over Australia from a hydrological viewpoint", "abstract": "", "keywords": [], "authors": [ { "name": "rajeshwar mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "mohammed a bari", "org": "" }, { "name": "narendra tuteja", "org": "" }, { "name": "g e amirthanathan", "org": "" } ], "venue": "Journal of Hydrology", "year": 2014 }, "TzwMWRwC": { "id": "TzwMWRwC", "title": "Spatial Disaggregation of Coarse Soil Moisture Data by Using High-Resolution Remotely Sensed Vegetation Products.", "abstract": "A novel approach is presented to spatially disaggregate coarse soil moisture (SM) by only using remotely sensed vegetation index. The approach is based on the conditional relationship of vegetation with time-aggregated SM, allowing the coarse-scale SM to be disaggregated to the spatial resolution of the vegetation product. The method was applied to satellite-derived SM over January 2010-December 2...", "keywords": [ "Vegetation mapping", "Spatial resolution", "Soil moisture", "Meteorology", "Indexes", "Optical sensors", "Land surface temperature" ], "authors": [ { "name": "Seokhyeon Kim", "org": "School of Civil and Environmental Engineering, UNSW, Sydney, NSW, Australia" }, { "name": "Keerthana Balakrishnan", "org": "Water Systems Planning, GHD, Parramatta, NSW, Australia" }, { "name": "Yi Liu", "org": "School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing, China" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, UNSW, Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, UNSW, Sydney, NSW, Australia" } ], "venue": "IEEE Geoscience and Remote Sensing Letters", "year": 2017 }, "8pMezDBd": { "id": "8pMezDBd", "title": "Multivariate streamflow forecasting using independent component analysis: MULTIVARIATE STREAMFLOW FORECASTING", "abstract": "", "keywords": [], "authors": [ { "name": "upmanu lall", "org": "" }, { "name": "seth westra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "casey brown", "org": "" } ], "venue": "Water Resources Research", "year": 2008 }, "8MAK0204": { "id": "8MAK0204", "title": "A comparison of three stochastic multi-site precipitation occurrence generators", "abstract": "This paper presents a comparison of three multi-site stochastic weather generators for simulation of point rainfall occurrences at a network of 30 raingauge stations around Sydney, Australia. The approaches considered include a parametric hidden Markov model (HMM), a multi-site stochastic precipitation generation model (proposed by [Wilks, D.S., 1998. Multi-site generalization of a daily stochastic precipitation model, J. Hydrol. 210, 178–191.]) and a non-parametric K -nearest neighbour (KNN) model. The HMM generates the precipitation distribution conditional on a discrete weather state representing certain identified spatial rainfall distribution patterns. The spatial dependence is maintained by assumption of a common weather state across all stations while the temporal dependence is simulated by assuming the weather state to be Markovian in nature. The Wilks model preserves serial dependence through the assumption of an order one Markov dependence at each location. The spatial dependence is simulated by prescribing a dependence pattern on the uniform random variates used to generate the rainfall occurrence at each location from the associated conditional probability distribution. The K -nearest neighbour approach simulates spatial dependence by simultaneously generating precipitation occurrence at all locations. Temporal persistence is simulated through Markovian assumptions on the rainfall occurrence process. The three methods are evaluated for their ability to model spatial and temporal dependence in the rainfall occurrence field and also the relative ease with which the assumptions of spatial and temporal dependence can be accommodated. Our results indicate that all the approaches are successful in reproducing spatial dependence in the multi-site rainfall occurrence field. However, the different orders of assumed Markovian dependence in the observed data limit their ability in representing temporal dependence at time scales longer than a few days. While each approach comes with its own advantages and disadvantages, the alternative proposed by Wilks has an overall advantage in offering a mechanism for modelling varying orders of serial dependence at each point location, while still maintaining the observed spatial dependence with sufficient accuracy.", "keywords": [ "rainfall generation", "aggregated time scale characteristics", "multi-site stochastic weather generator", "australia", "spatial and temporal dependence", "rainfall occurrence", "hidden markov model", "point location", "spatial dependence", "conditional probability" ], "authors": [ { "name": "R. Mehrotra", "org": "" }, { "name": "R. Srikanthan", "org": "Bureau of Meteorology, Melbourne, Australia" }, { "name": "Ashish Sharma", "org": "Civil and Environmental Engineering, The University of New South Wales, Kensington, Sydney, NSW 2052, Australia" } ], "venue": "Journal of Hydrology", "year": 2006 }, "sZCEV4cv": { "id": "sZCEV4cv", "title": "Increase in urban flood risk resulting from climate change – The role of storm temporal patterns", "abstract": "Warming temperatures are causing extreme rainfall to intensify resulting in increased risk of flooding in developed areas. Quantifying this increased risk is of critical importance for the protection of life and property as well as for infrastructure planning and design. The study presented in this manuscript uses a comprehensive hydrologic and hydraulic model of a fully developed urban/suburban catchment to explore two primary questions related to climate change impacts on flood risk: (1) How does climate change effects on storm temporal patterns and rainfall volumes impact flooding in a developed complex watershed? (2) Is the storm temporal pattern as critical as the total volume of rainfall when evaluating urban flood risk? The updated NOAA Atlas 14 intensity–duration–frequency (IDF) relationships and temporal patterns, widely used in design and planning modelling in the USA, form the basis of the assessment reported here. Current literature shows that a rise in temperature will result in intensification of rainfall. These impacts are not explicitly included in the NOAA temporal patterns, which can have consequences on the design and planning of adaptation measures. We use the expected increase in temperature for the RCP8.5 scenario for 2081–2100, to project temporal patterns and rainfall volumes to reflect future climatic change. The modelling analysis for a 22 km 2 developed watershed show that temporal patterns cause substantial variability in flood depths during a storm event. The changes in the projected temporal patterns alone increase the risk of flood magnitude between 1 to 35 % with the cumulative impacts of temperature rise on temporal pattern and the storm volume increasing flood risk by between 10 to 170 % across the locations that were referenced for a 50 year return period storm. The variability in catchment response to temporal patterns show that regional storage facilities are sensitive to rainfall patterns that are loaded at the latter part of the storm duration while the short duration extremely intense storms will cause extensive flooding at all locations. This study shows that changes in temporal patterns will have a significant impact on urban/suburban catchment response and need to be carefully considered and adjusted to account for climate change when used for design and planning future stormwater systems.", "keywords": "", "authors": [ { "name": "Suresh Hettiarachchi", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Conrad Wasko", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" } ], "venue": "Hydrology and Earth System Sciences Discussions", "year": 2017 }, "TvPXEb1N": { "id": "TvPXEb1N", "title": "Evaluating the non-stationarity of Australian annual maximum flood", "abstract": "", "keywords": [ "trend analysis", "cross correlation", "bootstrapping", "climate change" ], "authors": [ { "name": "ataur rahman", "org": "" }, { "name": "elias h ishak", "org": "" }, { "name": "seth westra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "george kuczera", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "PraPpQSo": { "id": "PraPpQSo", "title": "Disaggregation procedures for stochastic hydrology based on nonparametric density estimation", "abstract": "Synthetic simulation of streamflow sequences is important for the analysis of water supply reliability. Disaggregation models are an important component of the stochastic streamflow generation methodology. They provide the ability to simulate multiseason and multisite streamflow sequences that preserve statistical properties at multiple timescales or space scales. In recent papers we have suggested the use of nonparametric methods for streamflow simulation. These methods provide the capability to model time series dependence without a priori assumptions as to the probability distribution of streamflow. They remain faithful to the data and can approximate linear or nonlinear dependence. In this paper we extend the use of nonparametric methods to disaggregation models. We show how a kernel density estimate of the joint distribution of disaggregate flow variables can form the basis for conditional simulation based on an input aggregate flow variable. This methodology preserves summability of the disaggregate flows to the input aggregate flow. We show through applications to synthetic data and streamflow from the San Juan River in New Mexico how this conditional simulation procedure preserves a variety of statistical attributes.", "keywords": [ "procedure preserves a variety of statistical attributes.", "probability distribution", "synthetic data", "time series", "kernel density estimate", "water supply", "stochastic process" ], "authors": [ { "name": "David G. Tarboton", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Upmanu Lall", "org": "" } ], "venue": "Water Resources Research", "year": 1998 }, "MEiD4qbP": { "id": "MEiD4qbP", "title": "A method for combining SRTM DEM and ASTER GDEM2 to improve topography estimation in regions without reference data", "abstract": "Abstract Digital Elevation Models (DEMs) such as Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Models (ASTER GDEM), or Shuttle Radar Topography Mission DEM (SRTM) are widely used in remote areas and non-industrial countries because of their availability rather than their accuracy. Although a global DEM can be considerably enhanced using additional reference information such as higher resolution DEMs or ground truth points, improving accuracy in areas without reference data remains a challenge. This paper develops an approach to improve the accuracy of the estimated topography by combining two complementary DEMs (ASTER GDEM 1 arc-second and SRTM DEM 1 arc-second) in regions missing reference data. The combination approach is based on formulating relationships between slopes and weights in sites with reference data. Then the developed relationships are applied to sites with similar geomorphology to determine the combination weight for each DEM without using reference data. The results indicate that combined DEMs offer significant improvements of 47% and 20% in mean bias over a mountainous site, and 16% and 58% at a low-relief site when compared with the SRTM and ASTER GDEM products, respectively. DEM-derived drainages were also found to be more accurate for the combined DEMs than the near-global DEMs in areas where reference data is not available.", "keywords": "", "authors": [ { "name": "Hung T. Pham", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Hung T. Pham", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Lucy Marshall", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia" } ], "venue": "Remote Sensing of Environment", "year": 2018 }, "NltKxuPo": { "id": "NltKxuPo", "title": "An equivalent cross‐sectional basis for semidistributed hydrological modeling", "abstract": "", "keywords": [ "runoff", "richards equation", "soil moisture" ], "authors": [ { "name": "urooj khan", "org": "bureau of meteorology" }, { "name": "narendra tuteja", "org": "bureau of meteorology" }, { "name": "hoori ajami", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "university of new south wales" } ], "venue": "Water Resources Research", "year": 2014 }, "YEuY6z2e": { "id": "YEuY6z2e", "title": "Nonlinear manifold representation in natural systems: The SOMersault.", "abstract": "Abstract Natural systems often contain rhythmically fluctuating individual components which, when combined, can result in nonlinear patterns such as cycles, helixes, and parabolas. The self-organizing map (SOM) is a widely used artificial neural network for exploratory data analysis of high dimensional, multivariate data sets, however it encounters limitations when dealing with such highly nonlinear patterns. The SOMersault method is an expansion of the SOM, effective for gaining an understanding of patterns and clusters in natural data sets containing a low dimensional nonlinear manifold set amongst complex high dimensional data measurements. Data clusters become ordered with respect to the nonlinear degrees of freedom in the data, and patterns extracted are closely related to the data they represent. Results are shown on synthetic and real world data, involving a global set of river basins, with clustering and pattern extraction improvements displayed visually and quantified through a new set of geodesic error measures.", "keywords": "", "authors": [ { "name": "Stephanie Clark", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, Australia" }, { "name": "Scott A. Sisson", "org": "School of Mathematics and Statistics, University of New South Wales, Sydney, Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia" } ], "venue": "Environmental Modelling and Software", "year": 2017 }, "pm1UAMx0": { "id": "pm1UAMx0", "title": "A nonparametric stochastic downscaling framework for daily rainfall at multiple locations", "abstract": "Use of General Circulation Models (GCMs) for climate change impact assessment is often limited by their incapability at representing local features and dynamics at spatial scales finer than the in-built GCM grid scale. This has led to the development of downscaling techniques for transfer of coarse GCM simulated weather output to finer spatial resolutions. This paper presents a nonparametric stochastic spatial downscaling framework for multisite daily rainfall occurrence and amount. At site rainfall occurrences are downscaled using a nonparametric nonhomogeneous hidden Markov model (NNHMM) that represents spatial dependence across the rainfall occurrence field using a dynamic weather state indicative of the centroid and average wetness fraction of the rainfall occurrence field. The rainfall amounts on the wet days are downscaled using a nonparametric kernel density approach that accommodates variations in the rainfall downscaling model at individual locations. Spatial dependence in the rainfall amounts is simulated by driving each of the single-site amounts model with spatially correlated random numbers. The proposed framework is applied for downscaling of rainfall at a network of 30 rain gauge stations around Sydney in Australia, and its performance is evaluated. The analyses of the results show that the logic of providing separate treatments for rainfall occurrence and amounts at individual locations imparts considerable accuracy in the representation of characteristics of interest in hydrologic studies. These characteristics include representation of rainfall spell patterns, spatial distribution of the rainfall occurrence and amount fields, representation of low and high rainfall extremes at individual stations and across the field, as well as common indicators of water balance and variability that are of importance in a catchment scale water balance simulation.", "keywords": [ "downscaling", "spatial correlations", "rainfall", "spatial correlation", "water balance", "spatial scale", "spatial resolution", "kernel density", "general circulation model", "spatial dependence", "global change", "hidden markov model" ], "authors": [ { "name": "R. Mehrotra", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Geophysical Research", "year": 2006 }, "63h7AgPW": { "id": "63h7AgPW", "title": "Global seasonal precipitation forecasts using improved sea surface temperature predictions", "abstract": "Climate models driven by observed or modeled sea surface temperature (SST) or SST anomalies (SSTA) are used as a standard tool in seasonal climate predictions. This study investigates the merit of seasonal rainfall predictions obtained by using multimodel SSTA to drive a climate model over a single model case. The multimodel SSTA predictions are obtained by combining the predictions of five climate models, whereas the stand-alone model predictions come from the Predictive Ocean Atmosphere Model for Australia. The climate model used is the Australian Community Climate and Earth System Simulator (ACCESS). The use of multimodel SSTA over a single model shows marginal improvements in seasonal rainfall predictions across the entire globe. Further improvements in rainfall forecasts are possible either through improved parameterizations in the ACCESS model or by using another climate model. As a final step, the rainfall forecasts from the multimodel and the single model SSTA (two-member hierarchical rainfall forecasts, denoted as HIER) are combined and to gain further improvements over the individual multimodel or single model rainfall predictions for most of the grid cells in all seasons.", "keywords": "", "authors": [ { "name": "Mohammad Zaved Kaiser Khan", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" } ], "venue": "Journal of Geophysical Research", "year": 2017 }, "r0nrwX3N": { "id": "r0nrwX3N", "title": "A Network Approach for Delineating Homogeneous Regions in Regional Flood Frequency Analysis", "abstract": "", "keywords": "", "authors": [ { "name": "Xudong Han", "org": "School of Civil and Environmental Engineering, University of New South Wales,Sydney, NSW,Australia" }, { "name": "Taha B.M.J. Ouarda", "org": "INRS‐ETE, National Institute of Scientific Research Quebec City Canada" }, { "name": "Ataur Rahman", "org": "School of Computing, Engineering and Mathematics Western Sydney University, Building XB, Kingswood, Locked Bag 1797 Penrith NSW Australia" }, { "name": "Khaled Haddad", "org": "School of Engineering Western Sydney University Sydney Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering, University of New South Wales,Sydney, NSW,Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering, University of New South Wales,Sydney, NSW,Australia" } ], "venue": "Water Resources Research", "year": 2020 }, "HV0XA8Um": { "id": "HV0XA8Um", "title": "A comparison of methods to estimate future sub-daily design rainfall", "abstract": "Warmer temperatures are expected to increase extreme short-duration rainfall due to the increased moistureholding capacity of the atmosphere. While attention has been paid to the impacts of climate change on future design rainfalls at daily or longer time scales, the potential changes in short duration design rainfalls have been often overlooked due to the limited availability of sub-daily projections and observations. This study uses a high-resolution regional climate model (RCM) to predict the changes in sub-daily design rainfalls for the Greater Sydney region in Australia. Sixteen methods for predicting changes to sub-daily future extremes are assessed based on different options for bias correction, disaggregation and frequency analysis. A Monte Carlo cross-validation procedure is employed to evaluate the skill of each method in estimating the design rainfall for the current climate. It is found that bias correction significantly improves the accuracy of the design rainfall estimated for the current climate. For 1 h events, bias correcting the hourly annual maximum rainfall simulated by the RCM produces design rainfall closest to observations, whereas for multi-hour events, disaggregating the daily rainfall total is recommended. This suggests that the RCM fails to simulate the observed multi-duration rainfall persistence, which is a common issue for most climate models. Despite the significant differences in the estimated design rainfalls between different methods, all methods lead to an increase in design rainfalls across the majority of the study region.", "keywords": [ "Sub-daily design rainfall", "Bias correction", "Disaggregation", "Regional frequency analysis", "Climate change", "Regional climate model" ], "authors": [ { "name": "Jingwan Li", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Fiona Johnson", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" }, { "name": "Jason P. Evans", "org": "Univ New South Wales, Sch Biol Environm & Earth Sci, Climate Change Res Ctr, Sydney, NSW, Australia" }, { "name": "Ashish Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2017 }, "OYHpYtYI": { "id": "OYHpYtYI", "title": "A nonparametric model for stochastic generation of daily rainfall amounts", "abstract": "This paper presents a model for stochastic generation of rainfall amounts on wet days that is nonparametric, accommodates seasonality, and reproduces important distributional and dependence properties of observed rainfall. The model uses kernel density estimation techniques, which minimize the assumptions that are made about the underlying probability density, and representation of seasonal variations is achieved through the use of a moving window approach. Four different classes of rainfall amount are considered and categorized according to the number of adjacent wet days, and the model is conditioned on the rainfall amount on the previous day. The proposed model can emulate the day-to-day features that exist in the historical rainfall record, including the lag 1 correlation structure of rainfall amounts. We link this model with long sequences of rainfall occurrence generated by the model of Harrold et al. [2003], which is designed to reproduce the longer-term variability of the observed record. The approach is applied to daily rainfall from Sydney, Australia, and the performance of the approach is demonstrated by presentation of model results at daily, seasonal, annual, and interannual timescales.", "keywords": [ "nonparametric", "rainfall", "stochastic", "simulation", "seasonal variation", "stochastic process", "kernel density estimate", "probability density", "seasonality" ], "authors": [ { "name": "timothy i harrold", "org": "" }, { "name": "ashish sharma", "org": "university of new south wales" }, { "name": "simon j sheather", "org": "university of new south wales" } ], "venue": "Water Resources Research", "year": 2003 }, "o3vKiFKG": { "id": "o3vKiFKG", "title": "What are the impacts of bias correction on future drought projections?", "abstract": "", "keywords": [ "general circulation model" ], "authors": [ { "name": "fiona johnson", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Journal of Hydrology", "year": 2015 }, "RAjBB8ip": { "id": "RAjBB8ip", "title": "Improved water allocation utilizing probabilistic climate forecasts: Short-term water contracts in a risk management framework", "abstract": "Received 4 February 2009; revised 29 July 2009; accepted 6 August 2009; published 11 November 2009. (1) Probabilistic, seasonal to interannual streamflow forecasts are becoming increasingly available as the ability to model climate teleconnections is improving. However, water managers and practitioners have been slow to adopt such products, citing concerns with forecast skill. Essentially, a management risk is perceived in ''gambling'' with operations using a probabilistic forecast, while a system failure upon following existing operating policies is ''protected'' by the official rules or guidebook. In the presence of a prescribed system of prior allocation of releases under different storage or water availability conditions, the manager has little incentive to change. Innovation in allocation and operation is hence key to improved risk management using such forecasts. A participatory water allocation process that can effectively use probabilistic forecasts as part of an adaptive management strategy is introduced here. Users can express their demand for water through statements that cover the quantity needed at a particular reliability, the temporal distribution of the ''allocation,'' the associated willingness to pay, and compensation in the event of contract nonperformance. The water manager then assesses feasible allocations using the probabilistic forecast that try to meet these criteria across all users. An iterative process between users and water manager could be used to formalize a set of short-term contracts that represent the resulting prioritized water allocation strategy over the operating period for which the forecast was issued. These contracts can be used to allocate water each year/season beyond long-term contracts that may have precedence. Thus, integrated supply and demand management can be achieved. In this paper, a single period multiuser optimization model that can support such an allocation process is presented. The application of this conceptual model is explored using data for the Jaguaribe Metropolitan Hydro System in Ceara, Brazil. The performance relative to the current allocation process is assessed in the context of whether such a model could support the proposed short-term contract based participatory process. A synthetic forecasting example is also used to explore the relative roles of forecast skill and reservoir storage in this framework.", "keywords": [ "probabilistic forecasts", "drought management", "water contracts", "reservoir rule curves", "risk reduction", "supply and demand", "streams", "seasonality", "stream flow", "flow", "conceptual model", "forecasting", "optimization", "climate", "risk management", "water resources" ], "authors": [ { "name": "A. Sankarasubramanian", "org": "" }, { "name": "Upmanu Lall", "org": "" }, { "name": "Francisco Assis Souza Filho", "org": "" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering|University of New" } ], "venue": "Water Resources Research", "year": 2009 }, "QRasghBX": { "id": "QRasghBX", "title": "A quasi‐global assessment of changes in remotely sensed rainfall extremes with temperature", "abstract": "The dependence between extreme rainfall and temperature is used to understand climatic relationships, constrain model predictions and evaluate future changes to rainfall. Understanding this dependence, however, is limited by the fact that many areas worldwide lack gauged data, particularly at short time scales. The advent of remote sensing allows a new insight into this dependence quasi-globally. Here, we address whether remotely sensed daily rainfall and temperature can be used in ungauged areas to understand extreme rainfall scaling with temperature. Using the multi-sensor Tropical Rainfall Measuring Mission 3B42 (v7) rainfall product and remotely sensed air temperature we examine the spatial homogeneity in remotely sensed rainfall scaling with temperature and demonstrate that it replicates the spatial variation in the scaling observed in ground data. Finally, changes to duration and percentile are examined showing that the scaling response is climatologically sensitive.", "keywords": "", "authors": [ { "name": "C. Wasko", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "R. M. Parinussa", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" }, { "name": "A. Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales Australia" } ], "venue": "Geophysical Research Letters", "year": 2016 }, "3PjiMGvS": { "id": "3PjiMGvS", "title": "Identifying Sustained Drought Anomalies in Hydrological Records: A Wavelet Approach", "abstract": "", "keywords": "", "authors": [ { "name": "Md. Mamunur Rashid", "org": "" }, { "name": "Md. Mamunur Rashid", "org": "" }, { "name": "Fiona Johnson", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Sydney Australia" } ], "venue": "Journal of Geophysical Research", "year": 2018 }, "dvVY5b1l": { "id": "dvVY5b1l", "title": "Merging radar and gauge information within a dynamical model combination framework for precipitation estimation in cold climates", "abstract": "", "keywords": "", "authors": [ { "name": "Kuganesan Sivasubramaniam", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Knut Alfredsen", "org": "" } ], "venue": "Environmental Modelling and Software", "year": 2019 }, "Svhh67LI": { "id": "Svhh67LI", "title": "Should flood regimes change in a warming climate? The role of antecedent moisture conditions: TRENDS IN PREEXTREME RAINFALL", "abstract": "", "keywords": "", "authors": [ { "name": "Fitsum Woldemeskel", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Geophysical Research Letters", "year": 2016 }, "LT4l2wmJ": { "id": "LT4l2wmJ", "title": "Sampling biases in CMIP5 decadal forecasts", "abstract": "", "keywords": "", "authors": [ { "name": "Dipayan Choudhury", "org": "School of Civil and Environmental Engineering University of New South Wales Kensington New South Wales Australia" }, { "name": "Ashish Sharma", "org": "School of Civil and Environmental Engineering University of New South Wales Kensington New South Wales Australia" }, { "name": "Alex Sen Gupta", "org": "ARC Centre of Excellence for Climate System Science University of New South Wales Kensington New South Wales Australia" }, { "name": "Rajeshwar Mehrotra", "org": "School of Civil and Environmental Engineering University of New South Wales Kensington New South Wales Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering University of New South Wales Kensington New South Wales Australia" }, { "name": "Bellie Sivakumar", "org": "School of Civil and Environmental Engineering University of New South Wales Kensington New South Wales Australia" } ], "venue": "Journal of Geophysical Research", "year": 2016 }, "0gyaO7XJ": { "id": "0gyaO7XJ", "title": "On Correct Likelihoods and Model Combinations: A Bayesian Multi-Model Conceptual Framework for Structural Uncertainty Assessment", "abstract": "", "keywords": [ "parameter estimation", "uncertainty analysis", "likelihood function", "statistical inference", "model checking", "bayesian statistics", "bayesian approach", "conceptual model", "evapotranspiration", "conceptual framework" ], "authors": [ { "name": "rajiv mehrotra", "org": "" }, { "name": "timothy d smith", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "l a marshall", "org": "" } ], "venue": "", "year": 2010 }, "7wMwUSkZ": { "id": "7wMwUSkZ", "title": "Spatiotemporal variation of long‐term drought propensity through reliability‐resilience‐vulnerability based Drought Management Index", "abstract": "", "keywords": [ "resilience", "copula", "reliability", "vulnerability" ], "authors": [ { "name": "kironmala chanda", "org": "indian institute of technology kharagpur" }, { "name": "rajib maity", "org": "indian institute of technology kharagpur" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" }, { "name": "rajeshwar mehrotra", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2014 }, "2j130yO2": { "id": "2j130yO2", "title": "Integrating multiple scales of hydraulic conductivity measurements in training image‐based stochastic models", "abstract": "", "keywords": [ "renormalization", "hydrogeology" ], "authors": [ { "name": "k mahmud", "org": "nust school of civil and environmental engineering" }, { "name": "gregoire mariethoz", "org": "nust school of civil and environmental engineering" }, { "name": "a j baker", "org": "university of new south wales" }, { "name": "ashish sharma", "org": "nust school of civil and environmental engineering" } ], "venue": "Water Resources Research", "year": 2015 }, "DhZwOtmK": { "id": "DhZwOtmK", "title": "Improving radar rainfall estimation by merging point rainfall measurements within a model combination framework", "abstract": "While the value of correcting raw radar rainfall estimates using simultaneous ground rainfall observations is well known, approaches that use the complete record of both gauge and radar measurements to provide improved rainfall estimates are much less common. We present here two new approaches for estimating radar rainfall that are designed to address known limitations in radar rainfall products by using a relatively long history of radar reflectivity and ground rainfall observations. The first of these two approaches is a radar rainfall estimation algorithm that is nonparametric by construction. Compared to the traditional gauge adjusted parametric relationship between reflectivity (Z) and ground rainfall (R), the suggested new approach is based on a nonparametric radar rainfall estimation method (NPR) derived using the conditional probability distribution of reflectivity and gauge rainfall. The NPR method is applied to the densely gauged Sydney Terrey Hills radar network, where it reduces the RMSE in rainfall estimates by 10%, with improvements observed at 90% of the gauges. The second of the two approaches is a method to merge radar and spatially interpolated gauge measurements. The two sources of information are combined using a dynamic combinatorial algorithm with weights that vary in both space and time. The weight for any specific period is calculated based on the error covariance matrix that is formulated from the radar and spatially interpolated rainfall errors of similar reflectivity periods in a cross-validation setting. The combination method reduces the RMSE by about 20% compared to the traditional Z-R relationship method, and improves estimates compared to spatially interpolated point measurements in sparsely gauged areas. (C) 2016 Elsevier Ltd. All rights reserved.", "keywords": [ "Radar reflectivity", "Nonparametric radar rainfall", "Spatial interpolation", "Merging radar and gauge rainfall", "Weighted combination", "Spatial and temporal" ], "authors": [ { "name": "Mohammad Mahadi Hasan", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "Ashish Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "Gregoire Mariethoz", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "Fiona Johnson", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "Alan Seed", "org": "Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2016 }, "aG7KHL5P": { "id": "aG7KHL5P", "title": "Representing nonstationarity in the rainfall-runoff relationship using a Hierarchical Mixture of Experts model", "abstract": "", "keywords": [ "stochastic process" ], "authors": [ { "name": "l a marshall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "david j nott", "org": "" } ], "venue": "", "year": 2004 }, "9MkfY8Xo": { "id": "9MkfY8Xo", "title": "Improved spatial prediction: A combinatorial approach: Improved Spatial Prediction", "abstract": "", "keywords": [], "authors": [ { "name": "peter funder rasmussen", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "conrad wasko", "org": "" } ], "venue": "Water Resources Research", "year": 2013 }, "s09YURXZ": { "id": "s09YURXZ", "title": "Estimation of the climate change impact on a catchment water balance using an ensemble of GCMs", "abstract": "This work evaluates the impact of climate change on the water balance of a catchment in India. Rainfall and hydro-meteorological variables for current (20C3M scenario, 1981-2000) and two future time periods: mid of the 21st century (2046-2065) and end of the century (2081-2100) are simulated using Modified Markov Model-Kernel Density Estimation (MMM-KDE) and k-nearest neighbor downscaling models. Climate projections from an ensemble of 5 GCMs (MPI-ECHAM5, BCCR-BCM2.0, CSIRO-mk3.5, IPSL-CM4, and MRI-CGCM2) are used in this study. Hydrologic simulations for the current as well as future climate scenarios are carried out using Soil and Water Assessment Tool (SWAT) integrated with ArcGIS (ArcSWAT v.2009). The results show marginal reduction in runoff ratio, annual streamflow and groundwater recharge towards the end of the century. Increased temperature and evapotranspiration project an increase in the irrigation demand towards the end of the century. Rainfall projections for the future shows marginal increase in the annual average rainfall. Short and moderate wet spells are projected to decrease, whereas short and moderate dry spells are projected to increase in the future. Projected reduction in streamflow and groundwater recharge along with the increase in irrigation demand is likely to aggravate the water stress in the region under the future scenario. (C) 2017 Elsevier B.V. All rights reserved.", "keywords": "", "authors": [ { "name": "T.V. Reshmidevi", "org": "" }, { "name": "D. Nagesh Kumar", "org": "Department of Civil Engineering, Indian Institute of Science, Bangalore 560012, India" }, { "name": "R. Mehrotra", "org": "Water Research Centre, School of Civil and Environmental Engineering, UNSW, 2052 Sydney, Australia" }, { "name": "Ashish Sharma", "org": "Water Research Centre, School of Civil and Environmental Engineering, UNSW, 2052 Sydney, Australia" } ], "venue": "Journal of Hydrology", "year": 2018 }, "bU8PdfED": { "id": "bU8PdfED", "title": "From Interannual Streamflow Forecasts to New Water Management Strategies for Ceara, N. E. Brazil", "abstract": "", "keywords": [ "water supply", "ensemble forecasting", "river basin", "water use" ], "authors": [ { "name": "upmanu lall", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sujatha k arumugam", "org": "" }, { "name": "a f de souza filho", "org": "" } ], "venue": "", "year": 2002 }, "xovyupfI": { "id": "xovyupfI", "title": "Global Sea Surface Temperature Forecasts Using an Improved Multimodel Approach", "abstract": "", "keywords": [], "authors": [ { "name": "mohammad zaved kaiser khan", "org": "" }, { "name": "rajeshwar mehrotra", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "a sankarasubramanian", "org": "" } ], "venue": "Journal of Climate", "year": 2014 }, "hcUnT5rG": { "id": "hcUnT5rG", "title": "Insights on the impact of systematic model errors on data assimilation performance in changing catchments", "abstract": "The global prevalence of rapid and extensive land use change necessitates hydrologic modelling methodologies capable of handling non-stationarity. This is particularly true in the context of Hydrologic Forecasting using Data Assimilation. Data Assimilation has been shown to dramatically improve forecast skill in hydrologic and meteorological applications, although such improvements are conditional on using bias-free observations and model simulations. A hydrologic model calibrated to a particular set of land cover conditions has the potential to produce biased simulations when the catchment is disturbed. This paper sheds new light on the impacts of bias or systematic errors in hydrologic data assimilation, in the context of forecasting in catchments with changing land surface conditions and a model calibrated to pre-change conditions. We posit that in such cases, the impact of systematic model errors on assimilation or forecast quality is dependent on the inherent prediction uncertainty that persists even in pre-change conditions. Through experiments on a range of catchments, we develop a conceptual relationship between total prediction uncertainty and the impacts of land cover changes on the hydrologic regime to demonstrate how forecast quality is affected when using state estimation Data Assimilation with no modifications to account for land cover changes. This work shows that systematic model errors as a result of changing or changed catchment conditions do not always necessitate adjustments to the modelling or assimilation methodology, for instance through re-calibration of the hydrologic model, time varying model parameters or revised offline/online bias estimation.", "keywords": "", "authors": [ { "name": "Sahani Pathiraja", "org": "Univ Potsdam, Inst Math, Potsdam, Germany" }, { "name": "Daniela Anghileri", "org": "ETH, Inst Environm Engn, Zurich, Switzerland" }, { "name": "Paolo Burlando", "org": "ETH, Inst Environm Engn, Zurich, Switzerland" }, { "name": "Ashish Sharma", "org": "Univ New South Wales, Sch Civil & Environm Engn, Water Res Ctr, Sydney, NSW, Australia" }, { "name": "Lucy Marshall", "org": "Univ New South Wales, Sch Civil & Environm Engn, Water Res Ctr, Sydney, NSW, Australia" }, { "name": "Hamid Moradkhani", "org": "Portland State Univ, Dept Civil & Environm Engn, Portland, OR 97207 USA" } ], "venue": "ADVANCES IN WATER RESOURCES", "year": 2017 }, "NYF9xF5G": { "id": "NYF9xF5G", "title": "Probabilistic Estimation of Multivariate Streamflow Using Independent Component Analysis and Climate Information", "abstract": "", "keywords": [], "authors": [ { "name": "Seth Westra", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Journal of Hydrometeorology", "year": 2009 }, "dbwgm571": { "id": "dbwgm571", "title": "An Integrated Approach to Error Correction for Real-Time Radar-Rainfall Estimation", "abstract": "", "keywords": [ "error correction", "real time" ], "authors": [ { "name": "Siriluk Chumchean", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Alan Seed", "org": "" } ], "venue": "Journal of Atmospheric and Oceanic Technology", "year": 2006 }, "oAOWBsaB": { "id": "oAOWBsaB", "title": "Multisite seasonal forecast of arid river flows using a dynamic model combination approach: MULTISITE FLOW FORECAST", "abstract": "", "keywords": [], "authors": [ { "name": "shahadat chowdhury", "org": "" }, { "name": "ashish sharma", "org": "" } ], "venue": "Water Resources Research", "year": 2009 }, "XwqSVkgr": { "id": "XwqSVkgr", "title": "An exploratory study of seasonal rainfall variability in Australia using Independent Component Analysis", "abstract": "Component extraction techniques have been used frequently by climate and water resources researchers to analyse high dimensional datasets such as global sea surface temperature (SST) and rainfall time series. The motivation for using these techniques is usually twofold; firstly to reduce the dimension of the dataset, by representing the data using a small number of components that are able to describe a significant proportion of the total variance, and secondly to enhance our understanding of the dynamics of the underlying system, by interpreting these components as representing physically significant 'modes' of climate variability. In this study we explore the potential of a relatively new technique known as independent component analysis (ICA), which has been developed as a means to separate mixtures of signals when little is known about either the original signals, or the manner in which they have been mixed. This is a problem that occurs frequently in the climate field, where one wishes to understand the factors that contribute to the dynamical nature of a given set of observations. The premise of ICA is based on central limit theorem, which asserts that if a set of independent random variables is mixed using a linear transformation, the result will be a set of variables that tend towards a Gaussian distribution. Reversing this logic, if one rotates a mixed dataset in a manner that maximises the divergence from a Gaussian distribution, then under certain conditions it is possible to retrieve the original independent variables. Therefore, ICA focuses on higher-order statistics that measure the divergence from a Gaussian distribution. The ICA method is contrasted to the more widely used principal component analysis (PCA), which removes the correlation between the components while at the same time maximising the variance of successive principal components. This latter property in particular has proved to be useful to reduce the dimension of the datasets while retaining much of the information, and in the present study PCA is also used as a pre-processing step for ICA. The primary distinction between ICA and PCA is that while PCA uses only second order statistics to obtain uncorrelated components, ICA maximises the independence between components through the use of higher order statistics. Thus, while PCA may be well suited to variance maximisation and dimension reduction, ICA is fundamentally more suited to ensuring the statistical independence of the components and in certain cases is also capable of determining the underlying causes of this variability. To demonstrate the potential of the ICA technique in highlighting physically 'interesting' modes of variability, we apply PCA and ICA to a set of seasonal rainfall time series from over 200 rainfall gauges located around the Australian continent. It is assumed, based on the results of a number of earlier studies, that the El Nino Southern Oscillation (ENSO) phenomenon is an important factor in influencing Australian rainfall. Furthermore, it has been shown that an inter-decadal phenomenon, particularly the Inter-decadal Pacific Oscillation (IPO), may influence the degree of correlation between ENSO and Australian rainfall, with an enhanced link when the IPO is negative, and a reduced link when the IPO is positive. The results of this study consistently show that, for each season of the year, one independent component is significantly correlated with an index of the ENSO phenomenon known as the Southern Oscillation Index (SOI), with the highest correlation occurring during spring. Furthermore, during the IPO negative phase from 1946-1977, the correlation between one of the independent components and the SOI is further enhanced. This is contrasted with the PCA solution, in which the correlation coefficients for the majority of cases are not statistically significant. These results therefore indicate that ICA may have a significant potential to be applied to a number of alternative climate datasets to develop an improved understanding of the climate dynamics that govern those datasets.", "keywords": [ "Hydrology", "Australian rainfall", "ICA", "PCA", "ENSO" ], "authors": [ { "name": "sabrina westra", "org": "Univ New S Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" }, { "name": "ashish sharma", "org": "Univ New S Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia" } ], "venue": "MODSIM 2005: INTERNATIONAL CONGRESS ON MODELLING AND SIMULATION: ADVANCES AND APPLICATIONS FOR MANAGEMENT AND DECISION MAKING: ADVANCES AND APPLICATIONS FOR MANAGEMENT AND DECISION MAKING", "year": 2005 }, "MHGpHZn9": { "id": "MHGpHZn9", "title": "Modeling the catchment via mixtures: Issues of model specification and validation: MODELING THE CATCHMENT VIA MIXTURES", "abstract": "", "keywords": [], "authors": [ { "name": "david j nott", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "l a marshall", "org": "" } ], "venue": "Water Resources Research", "year": 2006 }, "QhbRzpVq": { "id": "QhbRzpVq", "title": "Time varying parameter models for catchments with land use change: the importance of model structure", "abstract": "Rapid population and economic growth in Southeast Asia has been accompanied by extensive land use change with consequent impacts on catchment hydrology. Modeling methodologies capable of handling changing land use conditions are therefore becoming ever more important and are receiving increasing attention from hydrologists. A recently developed data-assimilation-based framework that allows model parameters to vary through time in response to signals of change in observations is considered for a medium-sized catchment (2880 km 2 ) in northern Vietnam experiencing substantial but gradual land cover change. We investigate the efficacy of the method as well as the importance of the chosen model structure in ensuring the success of a time-varying parameter method. The method was used with two lumped daily conceptual models (HBV and HyMOD) that gave good-quality streamflow predictions during pre-change conditions. Although both time-varying parameter models gave improved streamflow predictions under changed conditions compared to the time-invariant parameter model, persistent biases for low flows were apparent in the HyMOD case. It was found that HyMOD was not suited to representing the modified baseflow conditions, resulting in extreme and unrealistic time-varying parameter estimates. This work shows that the chosen model can be critical for ensuring the time-varying parameter framework successfully models streamflow under changing land cover conditions. It can also be used to determine whether land cover changes (and not just meteorological factors) contribute to the observed hydrologic changes in retrospective studies where the lack of a paired control catchment precludes such an assessment.", "keywords": "", "authors": [ { "name": "Sahani Pathiraja", "org": "Institut für Mathematik,#N#Universität Potsdam,#N#Potsdam,#N#Germany" }, { "name": "Daniela Anghileri", "org": "Institute of Environmental Engineering,#N#ETH Zurich,#N#Zurich,#N#Switzerland" }, { "name": "Paolo Burlando", "org": "Institute of Environmental Engineering,#N#ETH Zurich,#N#Zurich,#N#Switzerland" }, { "name": "Ashish Sharma", "org": "Water Research Centre,#N#School of Civil and Environmental Engineering,#N#University of New South Wales, #N#Sydney, NSW,#N#Australia" }, { "name": "Lucy Marshall", "org": "Water Research Centre,#N#School of Civil and Environmental Engineering,#N#University of New South Wales, #N#Sydney, NSW,#N#Australia" }, { "name": "Hamid Moradkhani", "org": "Department of Civil, Construction and Environmental Engineering,#N#University of Alabama, #N#Tuscaloosa, Alabama,#N#USA" } ], "venue": "Hydrology and Earth System Sciences Discussions", "year": 2017 }, "lTrVuC5X": { "id": "lTrVuC5X", "title": "Global seasonal precipitation forecasts using improved sea surface temperature predictions: SEASONAL PRECIPITATION FORECASTS", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Zaved Kaiser Khan", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Rajeshwar Mehrotra", "org": "" } ], "venue": "Journal of Geophysical Research", "year": 2017 }, "V9yJKVKv": { "id": "V9yJKVKv", "title": "Collision-free spatial hash functions for structural analysis of billion-vertex chemical bond networks", "abstract": "State-of-the-art molecular dynamics (MD) simulations generate massive datasets involving billion-vertex chemical bond networks, which makes data mining based on graph algorithms such as K-ring analysis a challenge. This paper proposes an algorithm to improve the efficiency of ring analysis of large graphs, exploiting properties of K-rings and spatial correlations of vertices in the graph. The algorithm uses dual-tree expansion (DTE) and spatial hash-function tagging (SHAFT) to optimize computation and memory access. Numerical tests show nearly perfect linear scaling of the algorithm. Also a parallel implementation of the DTE + SHAFT algorithm achieves high scalability. The algorithm has been successfully employed to analyze large MD simulations involving up to 500 million atoms. PACS 07.05.Kf 07.05.Tp 61.43.Bn 61.72.Ff 82.20.Wt 89.20.Ff Keywords Ring analysis Topological network Molecular dynamics simulation Spatial hash function", "keywords": [ "ring analysis", "molecular dynamics simulation", "topological network", "spatial hash function", "data mining", "hash function", "molecular dynamic", "structure analysis", "spatial correlation" ], "authors": [ { "name": "Cheng Zhang", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Bhupesh Bansal", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Paulo S. Branicio", "org": "Departmento de Física, Universidade Federal de São Carlos, São Carlos, SP 13565, Brazil" }, { "name": "Rajiv K. Kalia", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Aiichiro Nakano", "org": "" }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Ohio State University, Columbus, OH 43210, USA" }, { "name": "Priya Vashishta", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" } ], "venue": "Computer Physics Communications", "year": 2006 }, "gvfLacuF": { "id": "gvfLacuF", "title": "De Novo Ultrascale Atomistic Simulations On High-End Parallel Supercomputers", "abstract": "We present a de novo hierarchical simulation framework for first-principles based predictive simulations of materials and their validation on high-end parallel supercomputers and geographically distributed clusters. In this framework, high-end chemically reactive and non-reactive molecular dynamics (MD) simulations explore a wide solution space to discover microscopic mechanisms that govern macroscopic material properties, into which highly accurate quantum mechanical (QM) simulations are embedded to validate the discovered mechanisms and quantify the uncertainty of the solution. The framework includes an embedded divide-and-conquer (EDC) algorithmic framework for the design of linear-scaling simulation algorithms with minimal bandwidth complexity and tight error control. The EDC framework also enables adaptive hierarchical simulation with automated model transitioning assisted by graph-based event tracking. A tunable hierarchical cellular decomposition parallelization framework then maps the O(N) EDC algorithms onto petaflops computers, while achieving performance tunability through a hierarchy of parameterized cell data/ computation structures, as well as its implementation using hybrid grid remote procedure call + message passing + threads programming. High-end computing platforms such as IBM BlueGene/L, SGI Altix 3000 and the NSF TeraGrid provide an excellent test grounds for the framework. On these platforms, we have achieved unprecedented scales of quantum-mechanically accurate and well validated, chemically reactive atomistic simulations—1.06 billion-atom fast reactive force-field MD and 11.8 million-atom (1.04 trillion grid points) quantum-mechanical MD in the framework of the EDC density functional theory on adaptive multigrids— in addition to 134 billion-atom non-reactive space—time multiresolution MD, with the parallel efficiency as high as 0.998 on 65,536 dual-processor BlueGene/L nodes. We have also achieved an automated execution of hierarchical QM/MD simulation on a grid consisting of 6 supercomputer centers in the US and Japan (in total of 150,000 processor hours), in which the number of processors change dynamically on demand and resources are allocated and migrated dynamically in response to faults. Furthermore, performance portability has been demonstrated on a wide range of platforms such as BlueGene/L, Altix 3000, and AMD Opteron-based Linux clusters.", "keywords": [ "grid computing", "quantum-mechanical md", "edc density", "reactive force field", "density func- tional theory", "quantum mechanics", "adaptive hierarchical simulation", "parallel computing", "parallelization framework", "edc algorithm", "time multiresolution md", "hierarchical simulation", "edc framework", "molecular dynamics", "md simulation", "high-end parallel supercomputers", "hierarchical simulation framework", "algorithmic framework", "de novo ultrascale atomistic", "material properties", "molecular dynamic", "parallel computer", "density function theory", "message passing", "first principle", "error control", "linux cluster", "divide and conquer", "space time", "remote procedure call", "force field", "density functional theory" ], "authors": [ { "name": "Aiichiro Nakano", "org": "COLLABORATORY FOR ADVANCED COMPUTING AND SIMULATIONS,UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA 90089-0242, USA" }, { "name": "Rajiv K. Kalia", "org": "COLLABORATORY FOR ADVANCED COMPUTING AND SIMULATIONS,UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA 90089-0242, USA" }, { "name": "Ken-Ichi Nomura", "org": "COLLABORATORY FOR ADVANCED COMPUTING AND SIMULATIONS,UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA 90089-0242, USA" }, { "name": "Ashish Sharma", "org": "COLLABORATORY FOR ADVANCED COMPUTING AND SIMULATIONS,UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA 90089-0242, USA, DEPARTMENT OF BIOMEDICAL INFORMATICS, OHIO STATE UNIVERSITY,COLUMBUS, OH 43 ..." }, { "name": "Priya Vashishta", "org": "COLLABORATORY FOR ADVANCED COMPUTING AND SIMULATIONS,UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA 90089-0242, USA" }, { "name": "Fuyuki Shimojo", "org": "COLLABORATORY FOR ADVANCED COMPUTING AND SIMULATIONS,UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA 90089-0242, USA, DEPARTMENT OF PHYSICS, KUMAMOTO UNIVERSITY, KUMAMOTO860-8555, JAPAN" }, { "name": "Adri C. T. Van Duin", "org": "MATERIALS AND PROCESS SIMULATION CENTER, CALIFORNIAINSTITUTE OF TECHNOLOGY, PASADENA, CA 91125, USA" }, { "name": "William A. Goddard", "org": "MATERIALS AND PROCESS SIMULATION CENTER, CALIFORNIAINSTITUTE OF TECHNOLOGY, PASADENA, CA 91125, USA" }, { "name": "Rupak Biswas", "org": "NASA ADVANCED SUPERCOMPUTING (NAS) DIVISION, NASA AMESRESEARCH CENTER, MOFFETT FIELD, CA 94035, USA" }, { "name": "Deepak Srivastava", "org": "NASA ADVANCED SUPERCOMPUTING (NAS) DIVISION, NASA AMESRESEARCH CENTER, MOFFETT FIELD, CA 94035, USA" }, { "name": "Lin H. Yang", "org": "PHYSICS/H DIVISION, LAWRENCE LIVERMORE NATIONAL LABORATORY,LIVERMORE, CA 94551, USA" } ], "venue": "IJHPCA", "year": 2008 }, "XLdyMu91": { "id": "XLdyMu91", "title": "VirtualPACS--a federating gateway to access remote image data resources over the grid.", "abstract": "Collaborations in biomedical research and clinical studies require that data, software, and computational resources be shared between geographically distant institutions. In radiology, there is a related issue of sharing remote DICOM data over the Internet. This paper focuses on the problem of federating multiple image data resources such that clients can interact with them as if they are stored in a centralized PACS. We present a toolkit, called VirtualPACS, to support this functionality. Using the toolkit, users can perform standard DICOM operations (query, retrieve, and submit) across distributed image databases. The key features of the toolkit are: (1) VirtualPACS makes it easy to use existing DICOM client applications for data access; (2) it can easily be incorporated into an imaging workflow as a DICOM source; (3) using VirtualPACS, heterogeneous collections of DICOM sources are exposed to clients through a uniform interface and common data model; and (4) DICOM image databases without DICOM messaging can be accessed.", "keywords": [ "digital imaging and communica- tions in medicine dicom", "teleradiology", "grid computing", "imaging informatics", "computer networks", "pacs", "pacs integration", "data model", "database management systems", "computer network", "data access" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics 3190 Graves Hall, 333 W 10th Ave. Columbus OH 43210 USA" }, { "name": "Tony Pan", "org": "Department of Biomedical Informatics 3190 Graves Hall, 333 W 10th Ave. Columbus OH 43210 USA" }, { "name": "B Barla Cambazoglu", "org": "Department of Biomedical Informatics 3190 Graves Hall, 333 W 10th Ave. Columbus OH 43210 USA" }, { "name": "Metin Gurcan", "org": "Department of Biomedical Informatics 3190 Graves Hall, 333 W 10th Ave. Columbus OH 43210 USA" }, { "name": "Tahsin Kurc", "org": "Department of Biomedical Informatics 3190 Graves Hall, 333 W 10th Ave. Columbus OH 43210 USA" }, { "name": "Joel Saltz", "org": "Department of Biomedical Informatics 3190 Graves Hall, 333 W 10th Ave. Columbus OH 43210 USA" } ], "venue": "J. Digital Imaging", "year": 2009 }, "za2VBncK": { "id": "za2VBncK", "title": "Integrated morphologic analysis for the identification and characterization of disease subtypes.", "abstract": "Morphologic variations of disease are often linked to underlying molecular events and patient outcome, suggesting that quantitative morphometric analysis may provide further insight into disease mechanisms. In this paper a methodology for the subclassification of disease is developed using image analysis techniques. Morphologic signatures that represent patient-specific tumor morphology are derived from the analysis of hundreds of millions of cells in digitized whole slide images. Clustering these signatures aggregates tumors into groups with cohesive morphologic characteristics. This methodology is demonstrated with an analysis of glioblastoma, using data from The Cancer Genome Atlas to identify a prognostically significant morphology-driven subclassification, in which clusters are correlated with transcriptional, genetic, and epigenetic events.Methodology was applied to 162 glioblastomas from The Cancer Genome Atlas to identify morphology-driven clusters and their clinical and molecular correlates. Signatures of patient-specific tumor morphology were generated from analysis of 200 million cells in 462 whole slide images. Morphology-driven clusters were interrogated for associations with patient outcome, response to therapy, molecular classifications, and genetic alterations. An additional layer of deep, genome-wide analysis identified characteristic transcriptional, epigenetic, and copy number variation events.Analysis of glioblastoma identified three prognostically significant patient clusters (median survival 15.3, 10.7, and 13.0 months, log rank p=1.4e-3). Clustering results were validated in a separate dataset. Clusters were characterized by molecular events in nuclear compartment signaling including developmental and cell cycle checkpoint pathways. This analysis demonstrates the potential of high-throughput morphometrics for the subclassification of disease, establishing an approach that complements genomics.", "keywords": [], "authors": [ { "name": "Lee A. D. Cooper", "org": "Center for Comprehensive Informatics, Emory University, Atlanta, Georgia 30322, USA. lee.cooper@emory.edu" }, { "name": "Jun Kong", "org": "emory university" }, { "name": "David A. Gutman", "org": "emory university" }, { "name": "Fusheng Wang", "org": "emory university" }, { "name": "Jingjing Gao", "org": "emory university" }, { "name": "Christina Appin", "org": "emory university school of medicine" }, { "name": "Sharath R. Cholleti", "org": "emory university" }, { "name": "Tony Pan", "org": "emory university" }, { "name": "Ashish Sharma", "org": "emory university" }, { "name": "Lisa Scarpace", "org": "ford motor company" }, { "name": "Tom Mikkelsen", "org": "ford motor company" }, { "name": "Tahsin M. Kurç", "org": "emory university" }, { "name": "Carlos S. Moreno", "org": "emory university" }, { "name": "Daniel J. Brat", "org": "emory university" }, { "name": "Joel H. Saltz", "org": "emory university" } ], "venue": "JAMIA", "year": 2012 }, "qOzK09pp": { "id": "qOzK09pp", "title": "Scalable and portable visualization of large atomistic datasets", "abstract": "Program summary Title of program: Atomsviewer Catalogue identifier: ADUM Program summary URL: http://cpc.cs.qub.ac.uk/summaries/ADUM Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland Computer for which the program is designed and others on which it has been tested: 2.4 GHz Pentium 4/Xeon processor, professional graphics card; Apple G4 (867 MHz)/G5, professional graphics card Operating systems under which the program has been tested: Windows 2000/XP, Mac OS 10.2/10.3, SGI IRIX 6.5 Programming languages used: C++, C and OpenGL Memory required to execute with typical data: 1 gigabyte of RAM High speed storage required: 60 gigabytes No. of lines in the distributed program including test data, etc.: 550 241 No. of bytes in the distributed program including test data, etc.: 6 258 245 Number of bits in a word: Arbitrary Number of processors used: 1 Has the code been vectorized or parallelized: No Distribution format: tar gzip file Nature of physical problem: Scientific visualization of atomic systems Method of solution: Rendering of atoms using computer graphic techniques, culling algorithms for data minimization, and levels-of-detail for minimal rendering Restrictions on the complexity of the problem: None Typical running time: The program is interactive in its execution Unusual features of the program: None References: The conceptual foundation and subsequent implementation of the algorithms are found in [A. Sharma, A. Nakano, R.K. Kalia, P. Vashishta, S. Kodiyalam, P. Miller, W. Zhao, X.L. Liu, T.J. Campbell, A. Haas, Presence—Teleoperators and Virtual Environments 12 (1) (2003)].", "keywords": [ "probabilistic occlusion culling", "hierarchical view frustum culling", "molecular dynamics", "visualization", "02.70.ns", "multiresolution algorithm", "07.05.rm", "field of view", "level of detail", "interactive visualization", "data structure", "occlusion culling", "molecular dynamic" ], "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Rajiv K. Kalia", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Material Science & Engineering, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Aiichiro Nakano", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Material Science & Engineering, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Priya Vashishta", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Material Science & Engineering, University of Southern California, Los Angeles, CA 90089-0242, USA" } ], "venue": "Computer Physics Communications", "year": 2004 }, "at2pKJEk": { "id": "at2pKJEk", "title": "Sharing data and analytical resources securely in a biomedical research Grid environment.", "abstract": "To develop a security infrastructure to support controlled and secure access to data and analytical resources in a biomedical research Grid environment, while facilitating resource sharing among collaborators.A Grid security infrastructure, called Grid Authentication and Authorization with Reliably Distributed Services (GAARDS), is developed as a key architecture component of the NCI-funded cancer Biomedical Informatics Grid (caBIG). The GAARDS is designed to support in a distributed environment 1) efficient provisioning and federation of user identities and credentials; 2) group-based access control support with which resource providers can enforce policies based on community accepted groups and local groups; and 3) management of a trust fabric so that policies can be enforced based on required levels of assurance.GAARDS is implemented as a suite of Grid services and administrative tools. It provides three core services: Dorian for management and federation of user identities, Grid Trust Service for maintaining and provisioning a federated trust fabric within the Grid environment, and Grid Grouper for enforcing authorization policies based on both local and Grid-level groups.The GAARDS infrastructure is available as a stand-alone system and as a component of the caGrid infrastructure. More information about GAARDS can be accessed at http://www.cagrid.org.GAARDS provides a comprehensive system to address the security challenges associated with environments in which resources may be located at different sites, requests to access the resources may cross institutional boundaries, and user credentials are created, managed, revoked dynamically in a de-centralized manner.", "keywords": [], "authors": [ { "name": "Stephen Langella", "org": "Department of Biomedical Informatics, The Ohio State University, 3184 Graves Hall, 333 West 10th Ave., Columbus, OH 43210, USA." }, { "name": "Shannon Hastings", "org": "" }, { "name": "Scott Oster", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Justin Permar", "org": "" }, { "name": "David Ervin", "org": "" }, { "name": "B Barla Cambazoglu", "org": "" }, { "name": "Tahsin Kurc", "org": "" }, { "name": "Joel Saltz", "org": "" } ], "venue": "Journal of the American Medical Informatics Association : JAMIA", "year": 2008 }, "GDl1JNNr": { "id": "GDl1JNNr", "title": "Texture based image recognition in microscopy images of diffuse gliomas with multi-class gentle boosting mechanism", "abstract": "The diagnosis of diffuse gliomas requires the careful inspection of large amounts of visual data. Identifying tissue regions that inform diagnosis is a cumbersome task for human reviewers and is a process prone to inter-reader variability. In this paper we present an automatic method for identifying critical diagnostic regions within whole-slide microscopy images of gliomas. We frame the problem of critical region identification as a texture-based content retrieval task in the sense that each image is represented by a set of texture features. Both linear and nonlinear dimensionality reduction techniques are utilized to explore the intrinsic dimensionality of the feature space where images are classified by classification and regression trees with performances improved by a newly extended multi-class gentle boosting (MCGB) mechanism. The proposed method is demonstrated on 1200 sample regions using a five-fold cross validation, achieving a 96.25% classification accuracy.", "keywords": [ "classification tree", "whole-slide microscopy images", "five-fold cross validation", "glioma", "extended multiclass gentle boosting mechanism", "diseases", "critical diagnostic regions", "biodiffusion", "gentle boosting", "regression analysis", "multiclass gentle boosting mechanism", "texture-based content retrieval task", "dimensionality reduction", "glioma diffusion", "image recognition", "texture analysis", "texture features", "regression tree", "nonlinear dimensionality reduction technique", "linear dimensionality reduction technique", "biomedical imaging", "microscopy image processing", "microscopy images", "feature space", "texture based image recognition", "medical image processing", "accuracy", "pathology", "testing", "nonlinear dimensionality reduction", "pixel", "boosting", "microscopy", "cross validation", "inspection", "image processing" ], "authors": [ { "name": "Jun Kong", "org": "" }, { "name": "Lee Cooper", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Tahsin M. Kurç", "org": "" }, { "name": "Daniel J. Brat", "org": "" }, { "name": "Joel H. Saltz", "org": "" } ], "venue": "ICASSP", "year": 2010 }, "uq79hH8f": { "id": "uq79hH8f", "title": "A roadmap for caGrid, an enterprise Grid architecture for biomedical research.", "abstract": "caGrid is a middleware system which combines the Grid computing, the service oriented architecture, and the model driven architecture paradigms to support development of interoperable data and analytical resources and federation of such resources in a Grid environment. The functionality provided by caGrid is an essential and integral component of the cancer Biomedical Informatics Grid (caBIG) program. This program is established by the National Cancer Institute as a nationwide effort to develop enabling informatics technologies for collaborative, multi-institutional biomedical research with the overarching goal of accelerating translational cancer research. Although the main application domain for caGrid is cancer research, the infrastructure provides a generic framework that can be employed in other biomedical research and healthcare domains. The development of caGrid is an ongoing effort, adding new functionality and improvements based on feedback and use cases from the community. This paper provides an overview of potential future architecture and tooling directions and areas of improvement for caGrid and caGrid-like systems. This summary is based on discussions at a roadmap workshop held in February with participants from biomedical research, Grid computing, and high performance computing communities.", "keywords": [ "computer security", "biomedical research" ], "authors": [ { "name": "Joel Saltz", "org": "" }, { "name": "Shannon Hastings", "org": "" }, { "name": "Stephen Langella", "org": "" }, { "name": "Scott Oster", "org": "" }, { "name": "Tahsin Kurc", "org": "" }, { "name": "Philip Payne", "org": "" }, { "name": "Renato Ferreira", "org": "" }, { "name": "Beth Plale", "org": "" }, { "name": "Carole Goble", "org": "" }, { "name": "David Ervin", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Justin Permar", "org": "" }, { "name": "Peter Brezany", "org": "" }, { "name": "Frank Siebenlist", "org": "" }, { "name": "Ravi Madduri", "org": "" }, { "name": "Ian Foster", "org": "" }, { "name": "Krishnakant Shanbhag", "org": "" }, { "name": "Charlie Mead", "org": "" }, { "name": "Neil Chue Hong", "org": "" } ], "venue": "HealthGrid", "year": 2008 }, "Rjf13wPu": { "id": "Rjf13wPu", "title": "is critical in a mammalian tissue stem cell population Rb", "abstract": "", "keywords": [ "stem cell" ], "authors": [ { "name": "Joel Saltz", "org": "" }, { "name": "Hideyuki Yamamoto", "org": "" }, { "name": "James C. Cross", "org": "" }, { "name": "Michael L. Robinson", "org": "" }, { "name": "Gustavo Leone", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Kun Huang", "org": "" }, { "name": "Randall Ridgway", "org": "" }, { "name": "Kishore Mosaliganti", "org": "" }, { "name": "Richard Sharp", "org": "" }, { "name": "Raghu Pamela", "org": "" }, { "name": "L. Wenzel", "org": "" }, { "name": "Lizhao Wu", "org": "" }, { "name": "Jean-Leon Chong", "org": "" }, { "name": "Wen-Yi Chen", "org": "" }, { "name": "Geoffrey Dureska", "org": "" } ], "venue": "", "year": 2008 }, "DfU9JrfE": { "id": "DfU9JrfE", "title": "Computer Physics Communications 163 (2004) 53–64 www.elsevier.com/locate/cpc Scalable and portable visualization of large atomistic datasets ✩", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "rajiv k kalia", "org": "" }, { "name": "aiichiro nakano", "org": "" }, { "name": "priya vashishta", "org": "" } ], "venue": "", "year": 2004 }, "6gjNeASF": { "id": "6gjNeASF", "title": "Dynamics of wing cracks and nanoscale damage in glass.", "abstract": "We investigate initiation, growth, and healing of wing cracks in confined silica glass by molecular dynamics simulations. Under dynamic compression, frictional sliding of precrack surfaces nucleates nanovoids which evolve into nanocrack columns at the precrack tip. Nanocrack columns merge to form a wing crack, which grows via coalescence with nanovoids in the direction of maximum compression. Lateral confinement arrests the growth and partially heals the wing crack. Growth and arrest of the wing crack occur repeatedly, as observed in dynamic compression experiments on brittle solids under lateral confinement.", "keywords": [], "authors": [ { "name": "Zhen Lu", "org": "" }, { "name": "Ken-ichi Nomura", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Weiqiang Wang", "org": "" }, { "name": "Cheng Zhang", "org": "" }, { "name": "Aiichiro Nakano", "org": "" }, { "name": "Rajiv Kalia", "org": "" }, { "name": "Priya Vashishta", "org": "" }, { "name": "Elisabeth Bouchaud", "org": "" }, { "name": "Cindy Rountree", "org": "" } ], "venue": "Physical review letters", "year": 2005 }, "xkmqXusf": { "id": "xkmqXusf", "title": "A new steerable pressure force for parametric deformable models", "abstract": "", "keywords": [ "image analysis", "active contour model", "convergence rate", "magnetic resonance imaging", "force field" ], "authors": [ { "name": "jun kong", "org": "emory university" }, { "name": "lee cooper", "org": "emory university" }, { "name": "ashish sharma", "org": "emory university" }, { "name": "tahsin kurc", "org": "emory university" }, { "name": "daniel j brat", "org": "emory university" }, { "name": "joel saltz", "org": "emory university" } ], "venue": "Medical Imaging: Image Processing", "year": 2011 }, "zZB3AocA": { "id": "zZB3AocA", "title": "Million-to-Billion Atom Simulation of Chemical Reactions: Embedded Divide-and-Conquer and Hierarchical Cellular Decomposition Frameworks for Scalable Scientific Computing", "abstract": "Simulating chemical reactions involving billions of atoms has been a dream of scientists, with broad societal impacts. This paper realizes the dream through novel simulation methods, algorithms, and parallel computing and visualization techniques. We have designed O(N) embedded divide-and-conquer (EDC) algorithms for 1) first principles-based parallel reactive force-field (P-ReaxFF) molecular dynamics (MD), and 2) density functional theory (DFT) on adaptive multigrids for quantum mechanical MD, based on a space-time multiresolution MD (MRMD) algorithm. To map these O(N) algorithms onto parallel computers, we have developed a hierarchical cellular decomposition (HCD) framework, including 1) wavelet-based computational-space decomposition for adaptive load balancing, and 2) octree-based probabilistic visibility culling for interactive visualization of billion-atom datasets. Preliminary tests on 1,920 Itanium2 processors of the NASA Columbia supercomputer have achieved unprecedented scales of reactive atomistic simulations: 0.56 billion-atom P-ReaxFF and 1.4 million-atom (0.12 trillion grid points) EDC-DFT simulations, in addition to 18.9 billion-atom MRMD simulation.", "keywords": [ "embedded divide-and-conquer", "load balancing", "hierarchical cellular decomposition", "density functional theory", "reactive force field", "quantum mechanics", "linear-scaling algorithm", "parallel computing", "massive data visualization", "molecular dynamics" ], "authors": [ { "name": "Aiichiro Nakano", "org": "" }, { "name": "Rajiv K. Kali", "org": "" }, { "name": "Ken-ichi Nomura", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Priya Vashishta", "org": "" }, { "name": "Fuyuki Shimojo", "org": "" }, { "name": "Adri C. T. van Duin", "org": "" }, { "name": "William A. Goddard", "org": "" }, { "name": "Rupak Biswas", "org": "" }, { "name": "Deepak Srivastava", "org": "" } ], "venue": "", "year": 0 }, "oIFZryXQ": { "id": "oIFZryXQ", "title": "Service-Based Access to and Processing of Large Scientific Datasets.", "abstract": "", "keywords": [], "authors": [ { "name": "Ümit V. Çatalyürek", "org": "" }, { "name": "Sivaramakrishnan Narayanan", "org": "" }, { "name": "Olcay Sertel", "org": "" }, { "name": "Jun Kong", "org": "" }, { "name": "Berkant Barla Cambazoglu", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Shannon Hastings", "org": "" }, { "name": "Stephen Langella", "org": "" }, { "name": "Scott Oster", "org": "" }, { "name": "Tahsin M. Kurç", "org": "" }, { "name": "Metin Nafi Gürcan", "org": "" }, { "name": "Joel H. Saltz", "org": "" } ], "venue": "High Performance Computing Workshop", "year": 2006 }, "xcV96H2K": { "id": "xcV96H2K", "title": "for Material Simulations Biological Computing and", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "aiichiro nakano", "org": "" }, { "name": "rajiv k kalia", "org": "" }, { "name": "priya vashishta", "org": "" }, { "name": "sanjay kodiyalam", "org": "" }, { "name": "p a miller", "org": "" }, { "name": "wei zhao", "org": "" }, { "name": "xinlian liu", "org": "" }, { "name": "timothy j campbell", "org": "" }, { "name": "andy haas", "org": "" }, { "name": "naval oceanographic", "org": "" } ], "venue": "", "year": 2008 }, "s5WuXqPM": { "id": "s5WuXqPM", "title": "High performance computing techniques for scaling image analysis workflows", "abstract": "Biomedical images are intrinsically complex with each domain and modality often requiring specialized knowledge to accurately render diagnosis and plan treatment. A general software framework that provides access to high-performance resources can make possible high-throughput investigations of micro-scale features as well as algorithm design, development and evaluation. In this paper we describe the requirements and challenges of supporting microscopy analyses of large datasets of high-resolution biomedical images. We present high-performance computing approaches for storage and retrieval of image data, image processing, and management of analysis results for additional explorations. Lastly, we describe issues surrounding the use of high performance computing for scaling image analysis workflows.", "keywords": [ "high performance computing", "image analysis workflows", "analysis result", "image data", "high-resolution biomedical image", "high-performance computing approach", "image processing", "biomedical image", "high-performance resource", "high performance computing technique", "microscopy analysis" ], "authors": [ { "name": "Patrick M. Widener", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Tahsin Kurc", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Wenjin Chen", "org": "Center for Biomedical Imaging & Informatics, UMDNJ-Robert Wood Johnson Medical School" }, { "name": "Fusheng Wang", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Lin Yang", "org": "Center for Biomedical Imaging & Informatics, UMDNJ-Robert Wood Johnson Medical School" }, { "name": "Jun Hu", "org": "Center for Biomedical Imaging & Informatics, UMDNJ-Robert Wood Johnson Medical School" }, { "name": "Vijay Kumar", "org": "Department of Computer Science and Engineering, Ohio State University" }, { "name": "Vicky Chu", "org": "Center for Biomedical Imaging & Informatics, UMDNJ-Robert Wood Johnson Medical School" }, { "name": "Lee Cooper", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Jun Kong", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Ashish Sharma", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Tony Pan", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "Joel H. Saltz", "org": "Center for Comprehensive Informatics, Emory University" }, { "name": "David J. Foran", "org": "Center for Biomedical Imaging & Informatics, UMDNJ-Robert Wood Johnson Medical School" } ], "venue": "PARA (2)", "year": 2010 }, "Sddv1sWJ": { "id": "Sddv1sWJ", "title": "Integrative, Multi-modal Analysis of Glioblastoma Using TCGA Molecular Data, Pathology Images and Clinical Outcomes", "abstract": "", "keywords": [], "authors": [ { "name": "jun kong", "org": "" }, { "name": "lee cooper", "org": "" }, { "name": "fusheng wang", "org": "" }, { "name": "david a gutman", "org": "" }, { "name": "jingjing gao", "org": "" }, { "name": "candace chisolm", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "tony pan", "org": "" }, { "name": "erwin van meir", "org": "" }, { "name": "tahsin kurc", "org": "" }, { "name": "carlos moreno", "org": "" }, { "name": "joel saltz", "org": "" }, { "name": "daniel j brat", "org": "" } ], "venue": "IEEE Transactions on Information Technology in Biomedicine", "year": 2011 }, "NTVeYs9P": { "id": "NTVeYs9P", "title": "AI in Medical Imaging Informatics: Current Challenges and Future Directions", "abstract": "This paper reviews state-of-the-art research solutions across the spectrum of medical imaging informatics, discusses clinical translation, and provides future directions for advancing clinical practice. More specifically, it summarizes advances in medical imaging acquisition technologies for different modalities, highlighting the necessity for efficient medical data management strategies in the context of AI in big healthcare data analytics. It then provides a synopsis of contemporary and emerging algorithmic methods for disease classification and organ/ tissue segmentation, focusing on AI and deep learning architectures that have already become the de facto approach. The clinical benefits of in-silico modelling advances linked with evolving 3D reconstruction and visualization applications are further documented. Concluding, integrative analytics approaches driven by associate research branches highlighted in this study promise to revolutionize imaging informatics as known today across the healthcare continuum for both radiology and digital pathology applications. The latter, is projected to enable informed, more accurate diagnosis, timely prognosis, and effective treatment planning, underpinning precision medicine.", "keywords": [ "Biomedical imaging", "X-ray imaging", "Magnetic resonance imaging", "Computed tomography", "Informatics", "Three-dimensional displays" ], "authors": [ { "name": "Andreas S. Panayides", "org": "Department of Computer Science, University of Cyprus, Nicosia, Cyprus" }, { "name": "Amir Amini", "org": "Electrical and Computer Engineering Department, University of Louisville, Louisville, KY, USA" }, { "name": "Nenad D. Filipovic", "org": "University of Kragujevac, Kragujevac, Serbia" }, { "name": "Ashish Sharma", "org": "Emory University Atlanta, GA, USA" }, { "name": "Sotirios A. Tsaftaris", "org": "School of Engineering, The University of Edinburgh, U.K." }, { "name": "Alistair Young", "org": "Department of Anatomy and Medical Imaging, University of Auckland, Auckland, New Zealand" }, { "name": "David Foran", "org": "Department of Pathology and Laboratory Medicine, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA" }, { "name": "Nhan Do", "org": "U.S. Department of Veterans Affairs Boston Healthcare System, Boston, MA, USA" }, { "name": "Spyretta Golemati", "org": "Medical School, National and Kapodistrian University of Athens, Athens, Greece" }, { "name": "Tahsin Kurc", "org": "Stony Brook University, Stony Brook, NY, USA" }, { "name": "Kun Huang", "org": "School of Medicine, Regenstrief Institute, Indiana University, IN, USA" }, { "name": "Konstantina S. Nikita", "org": "Biomedical Simulations and Imaging Lab, School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece" }, { "name": "Ben P. Veasey", "org": "Electrical and Computer Engineering Department, University of Louisville, Louisville, KY, USA" }, { "name": "Michalis Zervakis", "org": "Technical University of Crete, Chania, Crete, Greece" }, { "name": "Joel H. Saltz", "org": "Stony Brook University, Stony Brook, NY, USA" }, { "name": "Constantinos S. Pattichis", "org": "Department of Computer Science of the University of Cyprus, Nicosia, Cyprus" } ], "venue": "IEEE Journal of Biomedical and Health Informatics", "year": 2020 }, "doXpPNie": { "id": "doXpPNie", "title": "FastAutomatic Registration Algorithm forLargeMicroscopy Images", "abstract": "", "keywords": [], "authors": [ { "name": "lee cooper", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "tony pan", "org": "" } ], "venue": "", "year": 2006 }, "ZoRoGNlD": { "id": "ZoRoGNlD", "title": "Model Formulation: Sharing Data and Analytical Resources Securely in a Biomedical Research Grid Environment", "abstract": "", "keywords": [ "resource sharing", "biomedical informatics", "distributed environment", "access control" ], "authors": [ { "name": "Stephen Langella", "org": "" }, { "name": "Shannon Hastings", "org": "" }, { "name": "Scott Oster", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Justin Permar", "org": "" }, { "name": "David Ervin", "org": "" }, { "name": "Berkant Barla Cambazoglu", "org": "" }, { "name": "Tahsin M. Kurç", "org": "" }, { "name": "Joel H. Saltz", "org": "" } ], "venue": "JAMIA", "year": 2008 }, "b3T5OfHA": { "id": "b3T5OfHA", "title": "GridCAD: Grid-based Computer-aided Detection System1", "abstract": "", "keywords": [], "authors": [ { "name": "tony c pan", "org": "" }, { "name": "metin n gurcan", "org": "" }, { "name": "stephen langella", "org": "" }, { "name": "scott oster", "org": "" }, { "name": "shannon hastings", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "benjamin rutt", "org": "" }, { "name": "david ervin", "org": "" }, { "name": "tahsin kurc", "org": "" }, { "name": "khan m siddiqui", "org": "" }, { "name": "joel saltz", "org": "" }, { "name": "eliot siegel", "org": "" } ], "venue": "Radiographics", "year": 2007 }, "j7i2MmRk": { "id": "j7i2MmRk", "title": "Digital Pathology: Data-Intensive Frontier in Medical Imaging.", "abstract": "", "keywords": [ "information technology", "data management", "data storage", "medical imaging", "image analysis", "bioinformatics", "biomedical imaging", "image segmentation", "microscopy", "biomedical informatics", "pathology" ], "authors": [ { "name": "Lee A. D. Cooper", "org": "" }, { "name": "Alexis B. Carter", "org": "" }, { "name": "Alton B. Farris", "org": "" }, { "name": "Fusheng Wang", "org": "" }, { "name": "Jun Kong", "org": "" }, { "name": "David A. Gutman", "org": "" }, { "name": "Patrick M. Widener", "org": "" }, { "name": "Tony C. Pan", "org": "" }, { "name": "Sharath R. Cholleti", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Tahsin M. Kurç", "org": "" }, { "name": "Daniel J. Brat", "org": "" }, { "name": "Joel H. Saltz", "org": "" } ], "venue": "Proceedings of the IEEE", "year": 2012 }, "FZOI2yeR": { "id": "FZOI2yeR", "title": "Million-to-billion atom simulation of chemical reactions: embedded divide-and-conquer and hierarchical cellular decomposition frameworks for scalable scientific computing. Submitted to", "abstract": "", "keywords": [], "authors": [ { "name": "aiichiro nakano", "org": "" }, { "name": "a rajiv k kalia", "org": "" }, { "name": "a kenichi nomura", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "a priya vashishta", "org": "" }, { "name": "fuyuki shimojo a b", "org": "" }, { "name": "adri c t van duin", "org": "" }, { "name": "william a goddard", "org": "" }, { "name": "rupak biswas", "org": "" }, { "name": "d c srivastava", "org": "" } ], "venue": "", "year": 2005 }, "pbAsg3MR": { "id": "pbAsg3MR", "title": "GridIMAGE: A Novel Use of Grid Computing to Support Interactive Human and Computer-Assisted Detection Decision Support", "abstract": "This paper describes a Grid-aware image reviewing system (GridIMAGE) that allows practitioners to (a) select images from multiple\n geographically distributed digital imaging and communication in medicine (DICOM) servers, (b) send those images to a specified\n group of human readers and computer-assisted detection (CAD) algorithms, and (c) obtain and compare interpretations from human\n readers and CAD algorithms. The currently implemented system was developed using the National Cancer Institute caGrid infrastructure\n and is designed to support the identification of lung nodules on thoracic computed tomography. However, the infrastructure\n is general and can support any type of distributed review. caGrid data and analytical services are used to link DICOM image\n databases and CAD systems and to interact with human readers. Moreover, the service-oriented and distributed structure of\n the GridIMAGE framework enables a flexible system, which can be deployed in an institution (linking multiple DICOM servers\n and CAD algorithms) and in a Grid environment (linking the resources of collaborating research groups). GridIMAGE provides\n a framework that allows practitioners to obtain interpretations from one or more human readers or CAD algorithms. It also\n provides a mechanism to allow cooperative imaging groups to systematically perform image interpretation tasks associated with\n research protocols.", "keywords": [ "Grid computing", "grid architectures", "caBIG™", "caGrid", "computer-assisted detection", "digital imaging and communications in medicine" ], "authors": [ { "name": "Metin N. Gurcan", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Tony Pan", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Ashish Sharma", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Tahsin M. Kurç", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Scott Oster", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Stephen Langella", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Shannon Hastings", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" }, { "name": "Khan M. Siddiqui", "org": "University of Maryland School of Medicine Baltimore MD 21201 USA" }, { "name": "Eliot L. Siegel", "org": "University of Maryland School of Medicine Baltimore MD 21201 USA" }, { "name": "Joel H. Saltz", "org": "The Ohio State University Department of Biomedical Informatics 3190 Graves Hall, 333 W. 10th Ave Columbus OH 43210 USA" } ], "venue": "J. Digital Imaging", "year": 2007 }, "ECX0S6cX": { "id": "ECX0S6cX", "title": "Registration vs. Reconstruction: Incorporating Structural Constraint in Building 3-D Models from 2-D Microscopy Images", "abstract": "Registration is the key step for 3-D reconstruction of mi- croanatomical structures from large number of microscopy images of biomedical samples. However, in most current approaches, 3-D structural information is not incorporated in the registration process. We present a novel approach by integrating structural constraints into the reconstruction pipeline. In stead of registering each image to its neighbors, we transform each image based on the information derived from its neighbors with incorporated structural constraint on ducts. The entire process is automatic and tested on a mouse mammary gland dataset with 160 images in the size of about 7500-by-600 pixels. I. I NTRODUCTION Automatic image registration is the technique to optimally align two images (2-D or 3-D) based on some cost function or evaluation criteria such as maximum mutual information (MMI) and minimum summed square difference (1), (5). These techniques have also been applied in the case of reconstructing 3-D structures from stacks of 2-D images. For instance, given a series (e.g., 200) of microsocpy images of consecutive sections of mouse mammary gland, we want to reconstruct its 3-D model and specifically study the microanatomy of the ductal structures in the mammary gland. Due to the prevalence of soft tissues in the sample, the sections all have various distortion (e.g., shear and tear) and thus a nonrigid regis- tration method is usually used in the traditional regiter-and- reconstruction approach. A commonly asked question is how to evaluate/validate the results as there is no so-called ground truth available. This question actually implies a fundamental drawback of the traditional approach: the lack of structural constraint in the (optimization) process. As the registration is conducted over pairs of consecutive images, it only takes the consistency between two images into account but not the preservation of the original 3-D anatomical structure with the later being usually considered as a evaluation criteria instead of registration constraint. One consequence of such approach is illustrated in Figure 1 in which two ductal structures are \"reconstructed\" as two columns after this pairwise registration process even though \"perfect\" registration can be achieved between each pair of slides. In other words, such approach is more of a registration-for-registration approach than a registration-for-reconstruction one. In this paper, we present a different approach by putting the structural constraints into the processing pipeline. This implies that we need to integrate domain specific (biological) knowledge into our algorithm. In this paper, we begin with one of the most commonly accepted structural constraint: smoothness of ductal structures. Fig. 1. Left: original ductal structures sliced at different positions. Middle: the images for the ducts. Right: after the registration, the reconstructed ducts are column-like structures.", "keywords": [], "authors": [ { "name": "Lee Cooper", "org": "" }, { "name": "Kun Huang", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Kishore Mosaliganti", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Antony Trimboli", "org": "" }, { "name": "Michael Ostrowski", "org": "" } ], "venue": "", "year": 0 }, "B3Qq0NWT": { "id": "B3Qq0NWT", "title": "An imaging workflow for characterizing phenotypical change in large histological mouse model datasets.", "abstract": "This paper presents a workflow designed to quantitatively characterize the 3D structural attributes of macroscopic tissue specimens acquired at a micron level resolution using light microscopy. The specific application is a study of the morphological change in a mouse placenta induced by knocking out the retinoblastoma gene.This workflow includes four major components: (i) serial section image acquisition, (ii) image preprocessing, (iii) image analysis involving 2D pair-wise registration, 2D segmentation and 3D reconstruction, and (iv) visualization and quantification of phenotyping parameters. Several new algorithms have been developed within each workflow component. The results confirm the hypotheses that (i) the volume of labyrinth tissue decreases in mutant mice with the retinoblastoma (Rb) gene knockout and (ii) there is more interdigitation at the surface between the labyrinth and spongiotrophoblast tissues in mutant placenta. Additional confidence stem from agreement in the 3D visualization and the quantitative results generated.The source code is available upon request.", "keywords": [ "mutation", "phenotypical change", "light microscopy histology staining genetic phenotyping mutation morphometrics image analysis image registration segmentation visualization imaging workflow", "mouse placenta", "image preprocessing", "imaging workflow", "mutant placenta", "macroscopic tissue specimen", "segmentation", "mutant mouse", "morphometrics", "histology staining", "visualization", "image analysis", "genetic phenotyping", "large histological mouse model", "workflow component", "gene knockout", "labyrinth tissue decrease", "light microscopy", "image registration", "serial section image acquisition", "genetics", "3d visualization" ], "authors": [ { "name": "Kishore Mosaliganti", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA and Department of Computer Science and Engineering, 395 Dreese Labo ..." }, { "name": "Tony Pan", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA" }, { "name": "Randall Ridgway", "org": "Department of Computer Science and Engineering, 395 Dreese Laboratories, 2015 Neil Avenue, Columbus, OH 43210, USA" }, { "name": "Richard Sharp", "org": "Department of Computer Science and Engineering, 395 Dreese Laboratories, 2015 Neil Avenue, Columbus, OH 43210, USA" }, { "name": "Lee Cooper", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA" }, { "name": "Alex Gulacy", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA" }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA" }, { "name": "Okan Irfanoglu", "org": "Department of Computer Science and Engineering, 395 Dreese Laboratories, 2015 Neil Avenue, Columbus, OH 43210, USA" }, { "name": "Raghu Machiraju", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA and Department of Computer Science and Engineering, 395 Dreese Labo ..." }, { "name": "Tahsin Kurc", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA" }, { "name": "Alain de Bruin", "org": "Department of Molecular Virology, Immunology, and Medical Genetics, Biomedical Research Tower, 460 West 12th Avenue, Columbus, OH 43210, USA" }, { "name": "Pamela Wenzel", "org": "Department of Molecular Virology, Immunology, and Medical Genetics, Biomedical Research Tower, 460 West 12th Avenue, Columbus, OH 43210, USA" }, { "name": "Gustavo Leone", "org": "Department of Molecular Virology, Immunology, and Medical Genetics, Biomedical Research Tower, 460 West 12th Avenue, Columbus, OH 43210, USA" }, { "name": "Joel Saltz", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA and Department of Computer Science and Engineering, 395 Dreese Labo ..." }, { "name": "Kun Huang", "org": "Department of Biomedical Informatics, The Ohio State University, 3190 Graves Hall, 333 West 10th Avenue, Columbus, OH 43210, USA and Department of Computer Science and Engineering, 395 Dreese Labo ..." } ], "venue": "Journal of Biomedical Informatics", "year": 2008 }, "eoIqCZsO": { "id": "eoIqCZsO", "title": "Development of a Queriable Database for Oncology Outcome Analysis", "abstract": "\n Clinical trials and oncology data management have undergone considerable change in the past decade. Imaging has become a key\n tool for clinical trials management and a biomarker for clinical trial validation as imaging technologies improve and become\n more precise. Images have become extremely helpful in determining staging/eligibility, treatment response, and outcome determination\n including disease recurrence and progression. In modern protocols, images are often reviewed in real time to validate these\n points in order to improve compliance to study requirements and create uniform patient populations for clinical trials analysis.\n Data acquisition and management systems are currently in use to acquire and display images in electronic digital formats for\n view by both on site and off site radiology reviewers. As clinical trials become more global in focus, the ability for databases\n to accommodate diverse imaging acquisition strategies will become increasingly important for information review.\n \n ", "keywords": [], "authors": [ { "name": "Thomas J. FitzGerald", "org": "University of Massachusetts Memorial Medical Center Department of Radiation Oncology Quality Assurance Review Center (QARC) 55 Lake Avenue North Worcester MA 01655 USA" }, { "name": "Keith White", "org": "Primary Childrens Medical Center Salt Lake City Utah USA" }, { "name": "Joel Saltz", "org": "Ohio State University (caBIG) USA" }, { "name": "Ashish Sharma", "org": "Ohio State University (caBIG) USA" }, { "name": "Eliot Siegel", "org": "University of Maryland (caBIG) USA" }, { "name": "Marcia Urie", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Ken Ulin", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "James Purdy", "org": "University of California at Davis Advanced Technology Consortium (ATC) USA" }, { "name": "Walter Bosch", "org": "Washington University (ATC) USA" }, { "name": "John Matthews", "org": "Washington University (ATC) USA" }, { "name": "Joseph Deasy", "org": "Washington University (ATC) USA" }, { "name": "Geoffrey Ibbott", "org": "Radiological Physics Center (RPC) USA" }, { "name": "Fran Laurie", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Richard Hanusik", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Jeff Yorty", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Maryann Bishop-Jodoin", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Sandy Kessel", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "M. Giulia Cicchetti", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Kathleen McCarten", "org": "Hasbro Children’s Hospital (QARC) USA" }, { "name": "Nancy Rosen", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Richard Pieters", "org": "University of Massachusetts Quality Assurance Review Center (QARC) USA" }, { "name": "Stephan Voss", "org": "Boston Children’s Hospital Childrens Oncology Group (COG) USA" }, { "name": "Gregory Reaman", "org": "George Washington University Medical Center (COG) USA" }, { "name": "Mitchell Schnall", "org": "University of Pennsylvania American College of Radiology Imaging Network (ACRIN) USA" }, { "name": "Richard Schilsky", "org": "University of Chicago Cancer and Leukemia Group B (CALGB) USA" }, { "name": "Michael Knopp", "org": "Ohio Statue University (CALGB) USA" }, { "name": "Lawrence Schwartz", "org": "Memorial Sloan Kettering Cancer Center (CALGB) USA" }, { "name": "Laurence Baker", "org": "University of Michigan Southwest Oncology Group (SWOG) USA" }, { "name": "Robert Comis", "org": "Drexel University Eastern Oncology Cooperative Group (ECOG) USA" }, { "name": "Larry Kun", "org": "Pediatric Brain Tumor Consortium (PBTC) St Jude Children’s Research Hospital USA" }, { "name": "James Boyett", "org": "Pediatric Brain Tumor Consortium (PBTC) St Jude Children’s Research Hospital USA" }, { "name": "Uma Ramamurthy", "org": "Pediatric Brain Tumor Consortium (PBTC) St Jude Children’s Research Hospital USA" }, { "name": "Matthew Parliament", "org": "National Cancer Institute Canada (NCIC) Cross Chase Cancer Center Canada" }, { "name": "Heidi Nelson", "org": "American College of Surgeons Oncology Group (ACOSOG) Mayo Clinic USA" }, { "name": "David Ota", "org": "Duke University (ACOSOG) USA" } ], "venue": "", "year": 2008 }, "2sIcRDFU": { "id": "2sIcRDFU", "title": "Middleware Architecture Approaches for Collaborative Cancer Research", "abstract": "\n As our ability to capture and generate large biomedical datasets improves, researchers increasingly need to synthesize information\n using a variety of data types, data systems, and analysis tools. The need for informatics support to facilitate coordinated\n and federated access to disparate data and analysis resources is more pronounced in collaborative basic, clinical, and translational\n research studies spanning multiple institutions. This chapter presents a high-level overview of several middleware architecture\n frameworks and technologies and discusses how these approaches can be employed to address the informatics requirements of\n large-scale and collaborative cancer research.\n \n ", "keywords": [], "authors": [ { "name": "Tahsin Kurc", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Scott Oster", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Shannon Hastings", "org": "" }, { "name": "Stephen Langella", "org": "" }, { "name": "David Ervin", "org": "" }, { "name": "Justin Permar", "org": "" }, { "name": "Daniel Brat", "org": "" }, { "name": "T. J. Fitzgerald", "org": "" }, { "name": "James Purdy", "org": "" }, { "name": "Walter Bosch", "org": "" }, { "name": "Joel Saltz", "org": "Emory University Center for Comprehensive Informatics 36 Eagle Row Atlanta GA 30322 USA" } ], "venue": "", "year": 2010 }, "2Qzhd1M9": { "id": "2Qzhd1M9", "title": "Large Multidimensional Data Visualization for Materials Science", "abstract": "How does a crack propagate in a composite material? How does a high-speed projectile interact with its target? And how can we use this knowledge to make materials with high fracture toughness and impact damage resistance? Materials science poses such questions, which can be answered by simulating materials on supercomputers and analyzing their properties. Scientific visualization has emerged as an excellent tool in this analysis, and applications have been developed that allow the exploration of very large, multidimensional data sets from materials simulations in an immersive and interactive environment.", "keywords": [ "Multidimensional systems", "Data visualization", "Materials science and technology", "Rendering (computer graphics)", "Composite materials", "Computational modeling", "Projectiles", "Analytical models", "Material properties", "Stress" ], "authors": [ { "name": "Ashish Sharma", "org": "Dept. of Comput. Sci., Univ. of Southern California, Los Angeles, CA, USA" }, { "name": "Rajiv K. Kalia", "org": "" }, { "name": "Aiichiro Nakano", "org": "" }, { "name": "Priya Vashishta", "org": "" } ], "venue": "Computing in Science and Engineering", "year": 2003 }, "0zGNO4iF": { "id": "0zGNO4iF", "title": "A divide-and-conquer/cellular-decomposition framework for million-to-billion atom simulations of chemical reactions", "abstract": "To enable large-scale atomistic simulations of material processes involving chemical reactions, we have designed linear-scaling molecular dynamics (MD) algorithms based on an embedded divide-and-conquer (EDC) framework: first principles-based fast reactive force-field (F-ReaxFF) MD; and quantum-mechanical MD in the framework of the density functional theory (DFT) on adaptive multigrids. To map these O( N ) algorithms onto parallel computers with deep memory hierarchies, we have developed a tunable hierarchical cellular-decomposition (THCD) framework, which achieves performance tunability through a hierarchy of parameterized cell data/computation structures and adaptive load balancing through wavelet-based computational-space decomposition. Benchmark tests on 1920 Itanium2 processors of the NASA Columbia supercomputer have achieved unprecedented scales of quantum-mechanically accurate and well validated, chemically reactive atomistic simulations—0.56 billion-atom F-ReaxFF MD and 1.4 million-atom (0.12 trillion grid points) EDC–DFT MD—in addition to 18.9 billion-atom non reactive space–time multiresolution MD. The EDC and THCD frameworks expose maximal data localities, and consequently the isogranular parallel efficiency on 1920 processors is as high as 0.953. Chemically reactive MD simulations have been applied to shock-initiated detonation of energetic materials and stress-induced bond breaking in ceramics in corrosive environments.", "keywords": [ "parallel computing", "reactive force field", "02.70.−c", "quantum mechanics", "density functional theory", "molecular dynamics", "02.70.ns", "71.15.−m", "atoms", "molecular dynamic", "simulation", "force field", "first principle", "divide and conquer", "quantum electronics", "chemical reaction", "parallel processing", "chemical reactions", "algorithms", "density function theory", "parallel computer", "space time" ], "authors": [ { "name": "Aiichiro Nakano", "org": "" }, { "name": "Rajiv K. Kalia", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Ken-ichi Nomura", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Ashish Sharma", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Priya Vashishta", "org": "Collaboratory for Advanced Computing and Simulations, Department of Computer Science, Department of Physics & Astronomy, Department of Chemical Engineering & Materials Science, University of Southern California, Los Angeles, CA 90089-0242, USA" }, { "name": "Fuyuki Shimojo", "org": "Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan" }, { "name": "Adri C.T. van Duin", "org": "Materials and Process Simulation Center, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA" }, { "name": "William A. Goddard", "org": "Materials and Process Simulation Center, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA" }, { "name": "Rupak Biswas", "org": "NASA Advanced Supercomputing (NAS) Division, NASA Ames Research Center, Moffett Field, CA 94035, USA" }, { "name": "Deepak Srivastava", "org": "NASA Advanced Supercomputing (NAS) Division, NASA Ames Research Center, Moffett Field, CA 94035, USA" } ], "venue": "Computational Materials Science", "year": 2007 }, "CTWonZ8X": { "id": "CTWonZ8X", "title": "Scientific visualization and data mining for massive scientific datasets", "abstract": "Beowulf clusters and Grid computing have commoditized computing and one of the largest users of this commodity simulate large physical and biological systems involving billions of entities. Success of such ultrascale simulations depends essentially on the visualization and analysis of massive multivariate data sets. However with increasing system size, researchers are being overwhelmed with data and information. Scientific visualization and data mining are two powerful tools that can help a researcher explore and understand their data. However, exploratory and hence interactive visualization and mining of billion entity datasets pose enormous computational challenges. To address this issue, we are have developed scalable and parallel scientific visualization and data mining algorithms, to aid computational scientists performing billion-particle simulations of materials. We introduce novel algorithms that use hierarchical data abstraction for data culling, probabilities for occlusion culling, multiple levels-of-detail, and parallel and distributed variations of our techniques. These algorithms have been successfully implemented in a scientific visualization application that has been disseminated into the community and to visualize some of the largest systems in the world. We also present graph based clustering and feature detection algorithms to identify and track topological and structural anomalies of chemical bond networks in materials.", "keywords": [ "data mining", "Grid computing", "massive multivariate data set", "commoditized computing", "parallel scientific visualization", "scientific visualization application", "hierarchical data abstraction", "massive scientific datasets", "scientific visualization", "interactive visualization", "data mining algorithm" ], "authors": [ { "name": "Aiichiro Nakano", "org": "University of Southern California" }, { "name": "Ashish Sharma", "org": "University of Southern California" } ], "venue": "Scientific visualization and data mining for massive scientific datasets", "year": 2005 }, "xwkzuHCt": { "id": "xwkzuHCt", "title": "High-performance systems for in silico microscopy imaging studies", "abstract": "High-resolution medical images from advanced instruments provide rich information about morphological and functional characteristics of biological systems. However, most of the information available in biomedical images remains underutilized in research projects. In this paper, we discuss the requirements and design of system support for composing, executing, and exploring in silico experiments involving microscopy images. This framework aims to provide building blocks for large scale, high-performance analytical image exploration systems, through rich metadata models, comprehensive query and data access capabilities, and efficient database and HPC support.", "keywords": [ "comprehensive query", "silico microscopy imaging study", "system support", "rich metadata model", "rich information", "high-performance system", "biomedical image", "data access capability", "biological system", "advanced instrument", "hpc support", "high-resolution medical image", "high resolution", "biomedical imaging", "data access", "biological systems" ], "authors": [ { "name": "Fusheng Wang", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Tahsin Kurc", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Patrick Widener", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Tony Pan", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Jun Kong", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Lee Cooper", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "David Gutman", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Ashish Sharma", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Sharath Cholleti", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" }, { "name": "Vijay Kumar", "org": "Dept. of Computer Science and Engineering, Ohio State University, Columbus, Ohio" }, { "name": "Joel Saltz", "org": "Center for Comprehensive Informatics and Department of Biomedical Engineering, Emory University, Atlanta, Georgia" } ], "venue": "DILS", "year": 2010 }, "wl6J76S9": { "id": "wl6J76S9", "title": "Translational Research Design Templates, Grid Computing, and HPC.", "abstract": "Design templates that involve discovery, analysis, and integration of information resources commonly occur in many scientific research projects. In this paper we present examples of design templates from the biomedical translational research domain and discuss the requirements imposed on Grid middleware infrastructures by them. Using caGrid, which is a Grid middleware system based on the model driven architecture (MDA) and the service oriented architecture (SOA) paradigms, as a starting point, we discuss architecture directions for MDA and SOA based systems like caGrid to support common design templates.", "keywords": [ "grid computing", "translational research", "scientific research", "computer architecture", "bioinformatics", "computational modeling", "biomedical research", "software design", "data analysis", "information analysis", "service oriented architecture", "middleware" ], "authors": [ { "name": "Joel Saltz", "org": "" }, { "name": "Scott Oster", "org": "" }, { "name": "Shannon Hastings", "org": "" }, { "name": "Stephen Langella", "org": "" }, { "name": "Renato Ferreira", "org": "" }, { "name": "Justin Permar", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "David Ervin", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Umit Catalyurek", "org": "" }, { "name": "Tahsin Kurc", "org": "" } ], "venue": "IPDPS", "year": 2008 }, "BTIob2yN": { "id": "BTIob2yN", "title": "Systems Demonstration - Towards a Services Oriented Platform for Combined Radiology-Pathology Image Analysis and Interpretation.", "abstract": "", "keywords": "", "authors": [ { "name": "Tahsin M. Kurç", "org": "" }, { "name": "Joel H. Saltz", "org": "" }, { "name": "Fred W. Prior", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "AMIA", "year": 2018 }, "bRqoQWRd": { "id": "bRqoQWRd", "title": "Cytomegalovirus Infection in Postrenal Transplant Recipients: 18 Years' Experience From a Tertiary Referral Center.", "abstract": "CMV infection is quite prevalent in RTR, and early detection and immediate treatment or prophylaxis is of utmost importance. qRT-PCR is the gold standard and preferred over other methods; however pp65Ag assay still holds its importance in low-economic countries and populations where CMV infection is more prevalent and financial constraints are a major limitation.", "keywords": "", "authors": [ { "name": "Ranjana W Minz", "org": "Department of Immunopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Mahendra Kumar", "org": "Department of Immunopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: drbindmahendra@gmail.com." }, { "name": "Deepesh B Kanwar", "org": "Department of Renal Transplant and Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant and Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Prabhsimran Singh", "org": "Department of Immunopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Jagdeep Singh", "org": "Department of Immunopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant and Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Shashi Anand", "org": "Department of Immunopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vinay Sakhuja", "org": "Department of Nephrology and Transplant Medicine, Max Super Specialty Hospital, Mohali, India." }, { "name": "Mukut Minz", "org": "Department of Urology, Andrology, and Transplant Surgery, Fortis Hospital, Mohali, India." } ], "venue": "Transplantation proceedings", "year": 2020 }, "LHmTfKUh": { "id": "LHmTfKUh", "title": "005 STEROID FREE MAINTENANCE IMMUNOSUPPRESSION IN RENAL TRANSPLANTATION – A FOLLOW-UP OF 33 PATIENTS", "abstract": "", "keywords": [], "authors": [ { "name": "sunil kumar", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "sanand bag", "org": "" } ], "venue": "", "year": 2011 }, "SLKvV9n9": { "id": "SLKvV9n9", "title": "Management of Graft Duodenal Leak in Simultaneous Pancreas Kidney Transplant-a Case Report from India and Review of Literature.", "abstract": "Pancreatic transplantation is currently the only effective cure for Type 1 diabetes mellitus. It allows long-term glycemic control without exogenous insulin and amelioration of secondary diabetic complications. In India, pancreas transplant has not yet established with only a single successful transplant reported so far in the literature. We report a 24-year-old Type 1 diabetic patient with renal failure who underwent a simultaneous pancreas kidney transplant. On postoperative day 15, he had leak from the graft duodenal stump for which a tube duodenostomy and proximal diversion enterostomy was done. He had a high output pancreatic fistula following the procedure which was managed conservatively. The tube duodenostomy was removed at three and half months and enterostomy closure with restoration of bowel continuity was done at 6 months. After a follow up of 7 months, patient is doing well with a serum creatinine of 0.8 mg/dl and normal blood sugars, not requiring any exogenous insulin or oral hypoglycemic drugs. Managing patients with graft duodenal complications after pancreas transplant is challenging. Tube duodenostomy is a safe option in management of duodenal leak, although can lead to a persistent pancreatic fistula. A proximal diversion enterostomy allows early oral feeding and avoids the cost as well as the long term complications associated with parenteral nutrition.", "keywords": [ "Complications after transplantation", "Duodenal leak", "Simultaneous pancreas kidney transplant", "Type 1 diabetes mellitus" ], "authors": [ { "name": "Sunil Kumar", "org": "Department of Renal Transplant Surgery, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant Surgery, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Manish Rathi", "org": "Department of Nephrology, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Sanjay Bhadada", "org": "Department of Endocrinology, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Vikas Gupta", "org": "Department of General Surgery, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Anil Bhansali", "org": "Department of Endocrinology, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Anupam Lal", "org": "Department of Radiodiagnosis, Post graduate institute of medical education and research, Chandigarh, 160012 India." }, { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Post graduate institute of medical education and research, Chandigarh, 160012 India." } ], "venue": "The Indian journal of surgery", "year": 2016 }, "aRqEo8Uc": { "id": "aRqEo8Uc", "title": "041 TRANSPLANT RENAL ARTERY PSEUDOANEURYSMS TREATED BY EX- VIVO REPAIR AND REIMPLANTATION", "abstract": "", "keywords": [], "authors": [ { "name": "mukut minz", "org": "" }, { "name": "sanand bag", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sunil kumar", "org": "" } ], "venue": "", "year": 2011 }, "BJ7Mktt6": { "id": "BJ7Mktt6", "title": "THU0175 Comparison of Two Commonly Used Intra- Articular Steroid Preparations in Acutely Swollen Knee Joint in Patients with Chronic Arthritis – A Randomized Controlled Trial", "abstract": "Background Rheumatoid arthritis (RA) and Spondyloarthropathies (SpA) are the commonest chronic inflammatory arthritides and intra-articular corticosteroid therapy is commonly used to control flares in one or few joints. However, it is surprising that despite more fifty years of experience with intra-articular corticosteroids use and evidence to attest their usefulness, evidence in the form of controlled trials to evaluate individual agents and their comparison remains sparse. Objectives To compare the efficacy of intra-articular injection of methylprednisolone acetate with triamcinolone acetonide in treatment of acutely swollen knee joint in patients with chronic arthritis (RA and SpA) over a follow up period of 24 weeks using time to relapse and patient reported outcomes between the two groups. Methods Patients with RA/SpA and swollen knee joint were recruited in this double-blind, randomized controlled trial. They were randomized in 1:1 ratio to receive either intra-articular methylprednisolone acetate (80 mg) or triamcinolone acetonide (80 mg) and followed up over a period of 24 weeks with follow-up visits at 4,12 and 24 weeks. Patients continued to take their DMARDs and other medications, with the dose of oral corticosteroids kept ≤7.5 mg/day prednisolone or equivalent. At each visit, relapse in the target joint was assessed using clinical measures, which included joint tenderness and swelling. Numerical rating scales for joint swelling and pain in the target joint, disease activity (using DAS28 (3)/BASDAI) and functional status assessment using the Health assessment questionnaire (HAQ) were secondary outcomes. Trial #CTRI 006187. Results This study included 100 patients of RA and SpA (RA:SpA=89:11,M:F=24:76) with mean age being 41.9 (± 25.2) years and mean disease duration 5.38 years. Among these, 50 patients each received intra-articular methylprednisolone 80 mg or triamcinolone acetonide 80 mg. After 24 weeks follow-up, there was no significant difference in the relapse rate or time to relapse between the two groups, each group having 9 relapses (relapse rate in the two groups was 18.4% vs.18.8%) with an average time to relapse of 6.44 (±8.24) weeks and 7.44 (±9.74) weeks in methylprednisolone and triamcinolone groups (p=0.991). Reduction in NRS-pain was 5.50 and 5.38 and in NRS-swelling was 5.52 and 5.45 respectively in methylprednisolone and triamcinolone groups at 24 weeks. The reduction in DAS28 at 24 weeks was 1.78 in both the groups. There was no significant difference in functional status between the two groups, the average reduction in HAQ scores being 0.85 and 0.86 in methylprednisolone and triamcinolone groups respectively Conclusions Our study suggests that there is no significant difference between intra-articular methylprednislone and triamcinolone in terms of efficacy. References Pyne D,Ioannou Y,Mootoo R,et al.Intra-articular steroids in knee osteoarthritis:a comparative study of triamcinolone hexacetonide and methylprednisolone acetate,Clin Rheumatol.2004;23:116–205 Centeno LM,Moore ME,Preferred intra-articular corticosteroids and associated practice:a survry of members of the American College of Rheumatology,Arthritis Care Res.1994;7:151–155 Disclosure of Interest None declared", "keywords": "", "authors": [ { "name": "A. Kumar", "org": "Postgrad Inst Med Educ & Res, Rheumatol Div, Internal Med, Chandigarh, India" }, { "name": "V. Dhir", "org": "Postgrad Inst Med Educ & Res, Rheumatol Div, Internal Med, Chandigarh, India" }, { "name": "S. Singh", "org": "Postgrad Inst Med Educ & Res, Rheumatol Div, Internal Med, Chandigarh, India" }, { "name": "A. Sharma", "org": "Postgrad Inst Med Educ & Res, Rheumatol Div, Internal Med, Chandigarh, India" }, { "name": "S.S. Khanna", "org": "Postgrad Inst Med Educ & Res, Rheumatol Div, Internal Med, Chandigarh, India" } ], "venue": "ANNALS OF THE RHEUMATIC DISEASES", "year": 2016 }, "CxGmiUox": { "id": "CxGmiUox", "title": "Successful treatment of transplant renal artery stenosis with bare-metal stent in a patient with simultaneous pancreas and kidney transplantation", "abstract": "", "keywords": "", "authors": [ { "name": "DeepeshB Kenwar", "org": "" }, { "name": "SP Shivakumar", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Rajesh Vijayvergiya", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2020 }, "EwLOdiSO": { "id": "EwLOdiSO", "title": "A case–control study to identify risk factors for Pneumocystis jiroveci Pneumonia (PCP) in renal allograft transplant recipients", "abstract": "", "keywords": [], "authors": [ { "name": "navdeep singh", "org": "" }, { "name": "sunil kumar", "org": "" }, { "name": "deepesh b kenwar", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "mukut minz", "org": "" } ], "venue": "", "year": 2015 }, "x72xs7q5": { "id": "x72xs7q5", "title": "Tumoral masses in failed kidneys.", "abstract": "", "keywords": "", "authors": [ { "name": "Ritambhra Nada", "org": "Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: ritamduseja@yahoo.com." }, { "name": "Raja Ramachandran", "org": "Department of Nephrology Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: drraja_1980@yahoo.co.in." }, { "name": "Ashwani Kumar", "org": "Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "K L Gupta", "org": "Department of Nephrology Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Kidney international", "year": 2018 }, "TerFqpa7": { "id": "TerFqpa7", "title": "Utility of quantitative real time PCR in detection and monitoring of viral infections in post renal transplant recipients", "abstract": "Abstract Background Viral infections cause significant morbidity and mortality in post-transplant period. A highly sensitive and specific detection tool if used may help in early diagnosis and better management in these patients. The study aimed to assess the utility of quantitative real-time polymerase chain reaction (qRT-PCR) as a diagnostic and monitoring tool for viral infections in post renal transplant patients. Methods A quantitative real-time polymerase chain reaction (qRT-PCR) was performed to detect EBV and CMV infection in 50 patients on 1st, 2nd, 3rd, and after 6 months of renal transplantation. Results CMV infection was found in 34%, EBV in 28% of recipients, and 17% showed dual infection. Viruses were detectable after the first month of transplantation followed by symptomatic infections within first three months of follow-up, with diarrhea being the commonest symptom. These patients were also at high risk for developing other infections. Anti-thymocyte globulin (ATG) induction was a definitive risk factor for CMV/EBV infection in post operative period. Conclusion Renal transplant patients frequently develop one or more viral infections at a time. Regular monitoring with qRT-PCR and prompt antiviral therapy with reduction in immunosuppression may be an ideal approach for management of these patients.", "keywords": "", "authors": [ { "name": "P. Shivanesan", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Ranjana W. Minz", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Yashwant Kumar", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Deepesh B. Kanwar", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Sarabpreet Singh", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Harbir Singh Kohli", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Shashi Anand", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" }, { "name": "Ritambhra Nada", "org": "Department of Histopathology, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh 160012, India" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "etnflFjw": { "id": "etnflFjw", "title": "Complex interventions of abdominal aorta and its branches in children with Takayasu arteritis: Clinical experience from a tertiary care center in north-west India.", "abstract": "We hereby report six children with TA who were successfully managed with complex percutaneous interventions of the abdominal aorta and its major branches. Balloon dilatation and stent placement constitutes the mainstay of management of TA with stenosis of the large vessels.", "keywords": [ "Takayasu arteritis", "abdominal aorta", "drug-eluting stent", "hypertension", "mesenteric artery stent", "renal artery in-stent restenosis", "renal artery stent", "renal auto-transplantation", "stent fracture" ], "authors": [ { "name": "Rajesh Vijayvergiya", "org": "Department of Cardiology, Advanced Cardiac Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ankur K Jindal", "org": "Allergy Immunology Unit, Department of Paediatrics, Advanced Paediatrics Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Rakesh K Pilania", "org": "Allergy Immunology Unit, Department of Paediatrics, Advanced Paediatrics Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepti Suri", "org": "Allergy Immunology Unit, Department of Paediatrics, Advanced Paediatrics Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Anju Gupta", "org": "Allergy Immunology Unit, Department of Paediatrics, Advanced Paediatrics Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Saroj K Sinha", "org": "Department of Gastroenterology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Manphool Singhal", "org": "Department of Radiodiagnosis and Imaging, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ajay Bahl", "org": "Department of Cardiology, Advanced Cardiac Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Surjit Singh", "org": "Allergy Immunology Unit, Department of Paediatrics, Advanced Paediatrics Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "International journal of rheumatic diseases", "year": 2018 }, "r0fk4QnN": { "id": "r0fk4QnN", "title": "Exploring molecular basis of severity of pediatric SLE vs adult SLE", "abstract": "", "keywords": [], "authors": [ { "name": "p k das", "org": "" }, { "name": "ranjana w minz", "org": "" }, { "name": "b saikia", "org": "" }, { "name": "ashwani k sharma", "org": "" }, { "name": "sonia s anand", "org": "" }, { "name": "s p singh", "org": "" } ], "venue": "Indian Journal of Rheumatology", "year": 2014 }, "RpHp0DCJ": { "id": "RpHp0DCJ", "title": "Esophageal tuberculosis with coexisting opportunistic infections in a renal allograft transplant recipient.", "abstract": "We report a renal allograft transplant recipient with esophageal tuberculosis (TB) coinfected with herpes simplex virus (HSV) and Candida. The patient presented with oropharyngeal candidiasis and was started on fluconazole. Upper gastrointestinal endoscopy showed whitish patches with mucosal ulcers in the esophagus. Histopathological examination confirmed TB and HSV infection. The patient recovered after antiviral, antifungal, and anti-tubercular therapy with reduction in immunosuppression. In a TB-endemic zone, TB can coexist with opportunistic infections in an immunocompromised host.", "keywords": [ "Candida albicans", "esophageal tuberculosis", "herpes simplex virus", "infectious esophagitis", "renal transplantation" ], "authors": [ { "name": "Sunil Kumar", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India." }, { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India." }, { "name": "Saroj K Sinha", "org": "Department of Gastroenterology, PGIMER, Chandigarh, India." }, { "name": "Kim Vaiphei", "org": "Department of Histopathology, PGIMER, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India." }, { "name": "Deepesh B Kenwar", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India." } ], "venue": "Transplant infectious disease : an official journal of the Transplantation Society", "year": 2017 }, "9kahHDA6": { "id": "9kahHDA6", "title": "Optical coherence tomography in varying aetiologies of renal artery stenosis: a case series", "abstract": "The advantages of OCT imaging include demonstration of the arterial wall, pathological features of the disease, and to guide percutaneous interventions. The major limitation of OCT is its lower imaging depth, which may render imaging of large vessels difficult.", "keywords": [ "Case series", "Fibromuscular dysplasia", "Optical coherence tomography", "Post-transplant", "Renal artery stenosis", "Takayasu arteritis" ], "authors": [ { "name": "Rajesh Vijayvergiya", "org": "Department of Cardiology, Advanced Cardiac Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Kewal Kanabar", "org": "Department of Cardiology, Advanced Cardiac Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Darshan Krishnappa", "org": "Department of Cardiology, Advanced Cardiac Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ganesh Kasinadhuni", "org": "Department of Cardiology, Advanced Cardiac Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Takashi Akasaka", "org": "Department of Cardiovascular Medicine, Wakayama Medical University, Wakayama, Japan" } ], "venue": "European Heart Journal - Case Reports", "year": 2019 }, "yyqKcF18": { "id": "yyqKcF18", "title": "Real-life Bioequivalence of Tacrolimus in Patients With Living-Related Donor De Novo Renal Transplantation: An Observational Study.", "abstract": "Tacrolimus is a narrow therapeutic index drug. As a result, regulatory agencies worldwide recommend stringent bioequivalence evaluation criteria for approval of generics. Despite this, the professional transplantation societies have raised concerns over the safety and efficacy of generic substitutions. We conducted this pragmatic real-life bioequivalence study to assess the effect of generic substitutions of tacrolimus. This was an observational study including recipients of renal transplantation who were considered for generic medication substitution. Transplanted organs were from living-related donors and were performed at least 1 month before the study. Time of administration of the drug, time of dosing with respect to meals, and time of blood sample collection were controlled; however, the lot number of the generic drugs was not controlled. The participants were allowed to use their usual supplies irrespective of the lot number. Concentration (C) was quantified by liquid chromatography with tandem mass spectrometry after the generic substitution from ABC brand to XYZ brand. The average C ± SD with generic ABC was 11.09 ± 4.26 ng/mL and generic ABC was 9.7 ± 4.12 ng/mL. Though there was no statistically significant difference observed between the concentrations, when the individual patient data was examined, 2 patients were found to have a very high concentration of tacrolimus and at least 7 patients fell below the therapeutic range. These derangements called for retitration with the new generic tacrolimus (40%). The results of our study suggest that generic-to-generic substitutions should be carried out very carefully in a closely observed setting in patients with renal transplants. The strength of our study is that it matched the real clinical practice setting as much as possible unlike a bioequivalence study. Therefore, we recommend repeating C at least 3 times over a period of 7 to 10 days with a generic substitution to prevent untoward consequences.", "keywords": "", "authors": [ { "name": "Priyanka Naithani", "org": "Department of Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sumit Dey", "org": "Department of Urology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Savita Verma Attri", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Amol Patil", "org": "Department of Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ajay Patial", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sheetal Singh", "org": "Department of Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ritika Panwar", "org": "Department of Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "S P Sivakumar", "org": "Department of Renal Transplant, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Smita Pattanaik", "org": "Department of Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: pattanaik.smita@pgimer.edu.in." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant, Post Graduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Transplantation proceedings", "year": 2020 }, "oIe7OYXA": { "id": "oIe7OYXA", "title": "046 IMPACT OF RENAL TRANSPLANTATION ON CARDIAC FUNCTION IN PATIENTS WITH CHRONIC RENAL FAILURE", "abstract": "", "keywords": [], "authors": [ { "name": "narendra pandit", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "r kumar", "org": "" }, { "name": "k l gupta", "org": "" } ], "venue": "", "year": 2011 }, "3B3gs9OA": { "id": "3B3gs9OA", "title": "051 RENAL AUTOTRANSPLANTATION IN AN EIGHT YEAR OLD CHILD WITH CONGENITAL LEFT MAIN RENAL ARTERY STENOSIS STATUS POST STENTING WITH STENT FRACTURE – CASE REPORT", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "sunil kumar", "org": "" }, { "name": "sanand bag", "org": "" }, { "name": "sarbpreet singh", "org": "" } ], "venue": "", "year": 2011 }, "jsPWvhre": { "id": "jsPWvhre", "title": "040 HYBRID REPAIR OF LARGE ABDOMINAL AORTIC ANEURYSM IN A RENAL TRANSPLANT RECEPIENT: PREFERRED TREATMENT APPROACH", "abstract": "", "keywords": [], "authors": [ { "name": "mukut minz", "org": "" }, { "name": "sanand bag", "org": "" }, { "name": "yash paul sharma", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "varinder singh bedi", "org": "" } ], "venue": "", "year": 2011 }, "jmUBIxqK": { "id": "jmUBIxqK", "title": "Challenges in containing the burden of hepatitis B infection in dialysis and transplant patients in India: Efficacy of HBV vaccination after transplantation", "abstract": "", "keywords": [], "authors": [ { "name": "guliver potsangbam", "org": "" }, { "name": "ashok yadav", "org": "" }, { "name": "nirupama chandel", "org": "" }, { "name": "manish rathi", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "h s kohli", "org": "" }, { "name": "k l gupta", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "v sakhuja", "org": "" }, { "name": "vivekanand jha", "org": "" } ], "venue": "Nephrology", "year": 2011 }, "eB9qHX5p": { "id": "eB9qHX5p", "title": "Experience With 15 Years of Laparoscopic Donor Nephrectomy: Review of 2500 Cases.", "abstract": "LDN is a technically demanding surgery where surgeon experience appears to affect operative metrics such as operative time. The occurrence of intraoperative complications appears to be acceptably low, although serious complications are a possibility.", "keywords": "", "authors": [ { "name": "Sahil Rally", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Shivakumar S Patil", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Gaurav Shankar Pandey", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Kunal Kapoor", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Abhinav Seth", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: deepesh.doc@gmail.com." } ], "venue": "Transplantation proceedings", "year": 2020 }, "qa7bI5dv": { "id": "qa7bI5dv", "title": "Donation after cardiac death – PGI experience", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "deepesh b kenwar", "org": "" }, { "name": "sunil kumar", "org": "" }, { "name": "mukut minz", "org": "" } ], "venue": "", "year": 2015 }, "BXTP4C5h": { "id": "BXTP4C5h", "title": "Prevalence of high-risk human papilloma virus types and cervical smear abnormalities in female sex workers in Chandigarh, India.", "abstract": "The high prevalence of hrHPV among FSWs and HCs suggests the need for the implementation of effective National Screening Programme for early detection of hrHPV types to decrease the burden of cervical cancer, especially in high-risk population.", "keywords": "", "authors": [ { "name": "M P Singh", "org": "Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "M Kaur", "org": "School of Public, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "N Gupta", "org": "Department of Cytology and Gynecological Pathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "A Kumar", "org": "Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "K Goyal", "org": "Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "A Sharma", "org": "Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "M Majumdar", "org": "Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "M Gupta", "org": "School of Public, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "R K Ratho", "org": "Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Indian journal of medical microbiology", "year": 0 }, "kiCBkPE4": { "id": "kiCBkPE4", "title": "Utility of plasma exchange in early recurrent C3 glomerulopathy", "abstract": "", "keywords": "", "authors": [ { "name": "Ritambhra Nada", "org": "" }, { "name": "Raja Ramachandran", "org": "" }, { "name": "Ashwani Kumar", "org": "" }, { "name": "Joyita Bharati", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "KrishanLal Gupta", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2019 }, "mJckeP6W": { "id": "mJckeP6W", "title": "Pattern of renal involvement and its correlation with outcomes in patients with small and medium vessel vasculitis – experience from a tertiary care center in India", "abstract": "", "keywords": [], "authors": [ { "name": "a sharma", "org": "" }, { "name": "tarun mittal", "org": "" }, { "name": "manish rathi", "org": "" }, { "name": "ritambhra nada", "org": "" }, { "name": "rehim n rajan", "org": "" }, { "name": "ranjana w minz", "org": "" }, { "name": "kusum joshi", "org": "" }, { "name": "swaran p singh", "org": "" }, { "name": "v sakhuja", "org": "" } ], "venue": "", "year": 2013 }, "mQsn2HQR": { "id": "mQsn2HQR", "title": "044 SINGLE INCISION LAPAROSCOPIC DONOR NEPHRECTOMY – AN INITIAL EXPERIENCE", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "sunil kumar", "org": "" }, { "name": "mukut minz", "org": "" } ], "venue": "", "year": 2011 }, "y8BuTjdG": { "id": "y8BuTjdG", "title": "045 EVALUATION OF COAGULATION STATUS IN PRE AND POST-RENAL TRANSPLANT PATIENTS BY THROMBOELASTOGRAPHY", "abstract": "", "keywords": [], "authors": [ { "name": "jasmina ahluwalia", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "m adil asfan", "org": "" } ], "venue": "", "year": 2011 }, "JRo8Rina": { "id": "JRo8Rina", "title": "Serum Neopterin levels: A single institutional analysis of 211 kidney transplant recipients from North India", "abstract": "", "keywords": "", "authors": [ { "name": "Ravi Dhital", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Ranjana W. Minz", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Mukut Minz", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Ritambhara Nada", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Ashish Sharma", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Sarbpreet Singh", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Deepesh Kenwer", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" }, { "name": "Shashi Anand", "org": "Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "snhRdLKm": { "id": "snhRdLKm", "title": "Evaluation of subclinical gut inflammation using fecal calprotectin levels and colonic mucosal biopsy in psoriasis and psoriatic arthritis patients", "abstract": "", "keywords": "", "authors": [ { "name": "A. Sharma", "org": "Post Graduate Institute of Medical Education and Research ChandigarhIndia" }, { "name": "M. B. Adarsh", "org": "United Kingdom of Great Britain and Northern Ireland" }, { "name": "S. Dogra", "org": "Dermatology India" }, { "name": "K. Vaiphei", "org": "Histopathology India" }, { "name": "C. Vaishnavi", "org": "Gastroenterology India" }, { "name": "S. Sinha", "org": "Gastroenterology India" } ], "venue": "British Journal of Dermatology", "year": 2019 }, "myXukhCk": { "id": "myXukhCk", "title": "Ultrasound-guided angioplasty for treatment of peripheral stenosis of arteriovenous fistula - a single-center experience.", "abstract": "Ultrasound-guided angioplasty is an effective method with good long-term outcomes in selected dialysis patients with peripheral stenosis of AVF.", "keywords": "", "authors": [ { "name": "Sunil Kumar", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Nikhil Mahajan", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Shivakumar S Patil", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Navdeep Singh", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Soham Dasgupta", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Seetharam Tejavath", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Deepesh B Kenwar", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." }, { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Post-Graduate Institute of Medical Education and Research, Chandigarh - India." } ], "venue": "The journal of vascular access", "year": 2017 }, "vOItUgEM": { "id": "vOItUgEM", "title": "Use of autogenous internal iliac artery for bridging the external iliac artery after excision of Aspergillus mycotic aneurysm in renal transplant recipients.", "abstract": "Repair of vascular defects in the presence of infection remains a challenging task in immunocompromised patients. We report two patients with postrenal transplant Aspergillus mycotic aneurysms of the allograft renal artery involving the external iliac artery which were excised along with the allograft. The defect in the external iliac artery was repaired successfully with interposition of autogenous internal iliac artery graft. Use of an internal iliac artery graft in such settings has been rarely reported in English literature. Autogenous internal iliac artery grafts provide a useful method to bridge the vascular defects created by radical debridement in the presence of fungal infections.", "keywords": [], "authors": [ { "name": "Mukut Minz", "org": "" }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Sunil Kumar", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Mandya R Shivaprakash", "org": "Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Sanand Bag", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India" } ], "venue": "Journal of vascular surgery", "year": 2011 }, "z1qwAK7c": { "id": "z1qwAK7c", "title": "Risk for Delayed Graft Function in Deceased Donor Renal Transplant Patients: A Single-Center Experience From North India.", "abstract": "DGF in deceased donor transplantation may be attributed to donation after circulatory death, prolonged donor hospital stay, high donor leukocyte count, and high terminal creatinine.", "keywords": "", "authors": [ { "name": "Abhinav Seth", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Shivakumar S Patil", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Gaurav Shankar Pandey", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vidyasagar Kallepalli", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sahil Rally", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vivek Thakur", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Milind Mandwar", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: drsarbpreet@yahoo.com." } ], "venue": "Transplantation proceedings", "year": 2020 }, "BuMHTYOG": { "id": "BuMHTYOG", "title": "Laparoscopic donor nephrectomy in a patient with Huntington's chorea", "abstract": "", "keywords": [], "authors": [ { "name": "indu sen", "org": "post graduate institute of medical education and research" }, { "name": "a k sharma", "org": "post graduate institute of medical education and research" }, { "name": "mukesh kumar", "org": "post graduate institute of medical education and research" }, { "name": "kps doddy", "org": "post graduate institute of medical education and research" } ], "venue": "", "year": 2009 }, "9e9jAhro": { "id": "9e9jAhro", "title": "FRI0218 Validation of the consensus methodology algorithm for the classification of systemic necrotizing vasculitis", "abstract": "", "keywords": [], "authors": [ { "name": "a k sharma", "org": "" }, { "name": "tarun mittal", "org": "" }, { "name": "manish rathi", "org": "" }, { "name": "ranjana w minz", "org": "" }, { "name": "s p singh", "org": "" } ], "venue": "Annals of the Rheumatic Diseases", "year": 2012 }, "16fOpFaX": { "id": "16fOpFaX", "title": "Single center experience in laparoscopic donor nephrectomy", "abstract": "", "keywords": [], "authors": [ { "name": "deepesh b kenwar", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "sunil kumar", "org": "" }, { "name": "nikhil mahajan", "org": "" }, { "name": "shivakumar patil", "org": "" }, { "name": "navdeep singh", "org": "" } ], "venue": "", "year": 2015 }, "zUIcarpE": { "id": "zUIcarpE", "title": "Immunopathology of active and remitting granulomatosis with poyangiitis (Wegener’s)", "abstract": "", "keywords": [], "authors": [ { "name": "lekha rani", "org": "" }, { "name": "ranjana w minz", "org": "" }, { "name": "a sharma", "org": "" }, { "name": "sonia s anand", "org": "" }, { "name": "d gupta", "org": "" }, { "name": "naresh k panda", "org": "" }, { "name": "v sakhuja", "org": "" } ], "venue": "", "year": 2013 }, "oOmLpldX": { "id": "oOmLpldX", "title": "Endovascular treatment of an external iliac artery dissection causing early renal graft dysfunction.", "abstract": "Vascular complications such as renal artery or renal vein thrombosis and laceration and iliac artery dissection are rarely encountered after renal transplantation. Timely management of these vascular complications is important to prevent ischemic injury of a transplanted kidney. We hereby report a case of a 60-year-old male who had acute renal dysfunction due to iatrogenic left external iliac artery dissection after renal transplantation. An endovascular stenting of the dissected iliac artery resulted in a brisk flow across both iliac and transplanted renal arteries. The management issues related to this rare vascular complication is discussed in the article.", "keywords": [ "Endovascular stent", "Renal transplant", "iliac artery dissection" ], "authors": [ { "name": "Rajesh Vijayvergiya", "org": "Postgrad Inst Med Educ & Res, Dept Cardiol, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Postgrad Inst Med Educ & Res, Dept Renal Transplant Surg, Chandigarh, India" }, { "name": "Sarbpreet Singh", "org": "Postgrad Inst Med Educ & Res, Dept Renal Transplant Surg, Chandigarh, India" }, { "name": "Kewal Kanabar", "org": "Postgrad Inst Med Educ & Res, Dept Cardiol, Chandigarh, India" } ], "venue": "ANNALS OF VASCULAR SURGERY", "year": 2019 }, "vAPbGMRc": { "id": "vAPbGMRc", "title": "074 ENDOVASCULAR REPAR OF LARGE ABDOMINAL AORTIC ANEURYSM IN A RENAL TRANSPLANT RECEPIENT: PREFERRED TREATMENT APPROACH", "abstract": "", "keywords": [], "authors": [ { "name": "sanand bag", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "varinder singh bedi", "org": "" }, { "name": "sarbpreet singh", "org": "" } ], "venue": "", "year": 2011 }, "mpf1LFkk": { "id": "mpf1LFkk", "title": "Furosemide-induced tubular dysfunction responding to prostaglandin synthesis inhibitor therapy in a child with nephrotic syndrome.", "abstract": "Furosemide is one of the most common drug used to treat anasarca in childhood nephrotic syndrome. It has minimal side effects on short-term usage, but prolonged use can result in polyuria, hypokalemia and metabolic alkalosis. This pseudo-bartter complication can be treated by discontinuation of the drug with adequate potassium replacement. We report a child who was given furosemide for 20 days elsewhere to treat the edema due to nephrotic syndrome and then presented to us with bartter-like syndrome. Furosemide was discontinued and potassium replacement was initiated. However, the child continued to have polyuria leading to repeated episodes of hypotensive shock. In view of severe symptoms, she was given a short course of oral indomethacin for 6 days, to which she responded. This case highlights the fact that indomethacin can provide symptomatic improvement in furosemide induced pseudo-bartter.", "keywords": [ "Furosemide", "Pseudo bartter syndrome", "Potassium", "Metabolic alkalosis", "Indomethacin" ], "authors": [ { "name": "T Harish Varma", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India." }, { "name": "Ashish Sharma", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India." }, { "name": "S Santhiya", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India." }, { "name": "Lesa Dawman", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India." }, { "name": "Karalanglin Tiewsoh", "org": "Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India. ktiewsoh@rediffmail.com." } ], "venue": "CEN case reports", "year": 2018 }, "nFEjV9Op": { "id": "nFEjV9Op", "title": "Analysis of Organ Utilization From Deceased Organ Donation in India.", "abstract": "There is a significant regional variability in organ utilization in India. Evaluating and addressing the cause of high variability can further increase the transplant activity.", "keywords": "", "authors": [ { "name": "Gaurav Shankar Pandey", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Shivakumar S Patil", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Abhinav Seth", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vidyasagar Kallepalli", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sahil Rally", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vivek Thakur", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Milind Mandwar", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Smita Pattanaik", "org": "Department of Clinical Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Rajinder Kaur", "org": "Department of Hepatology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: drsarbpreet@yahoo.com." } ], "venue": "Transplantation proceedings", "year": 2020 }, "za70bp9P": { "id": "za70bp9P", "title": "FRI0103 Erythrocyte Methotrexate Polyglutamate Levels Do Not Determine Efficacy and Tolerability of Methotrexate in Rheumatoid Arthritis", "abstract": "Background Methotrexate (MTX), a mono-glutamate, by addition of 2–6 more glutamate moieties, is converted to methotrexate polyglutamates (MTX PGs) intracellularly. These are the active compounds mediating folate pathway inhibition and increase in adenosine. Erythrocyte polyglutamate levels (RBC MTX PGs) are surrogate markers for levels inside lymphocytes and hepatocytes.Variability in RBC MTX PGs formed intracellularly (despite similar MTX dose) may be one of the factors determining variability in efficacy of MTX. Previously, contrasting results have been found on their association with efficacy and few prospective studies exist. Objectives To assay levels of erythrocyte methotrexate polyglutamate (1–5) levels in patients with rheumatoid arthritis and assess their relationship to efficacy and adverse effects. Methods Prospective study that included patients of RA (fulfilling 1987 ACR), aged 18–65 years with active disease (DAS28–3vu003e3.2) and not on methotrexate. Oral MTX was started at 15 mg/week and increased to 25 mg/week at 8 weeks. Disease activity measured using DAS28 (3 variables), and at 24 weeks patients classified into responders (EULAR good or moderate response) or non-responders. MTX-PG levels (PGs 1–5) assayed in deproteinised packed RBCs by HPLC using reverse phase (C18 column) and post-column derivitization using UV photo-oxidation followed by fluorescent detection (ex 274; em 470 nm). Results Included 117 patients, with mean (±SD) age of 42.7±11.9 years, disease duration 2.0±1.7 years, 71.8% RF+ and 85.7% CCP+. At 24 weeks, there were 57 responders and 33 non-responders with no significant difference in mean (±SD) MTX dose (21.7±3.9, 22.7± 4.1mg/week, p=ns), age, disease duration, but with lower BMI (21.7±3.9, 24±4.5 kg/m 2 , p=0.02) and higher baseline DAS28(3) (6.5±0.7, 6.1±0.9, p=0.02). There was an early and sustained gap between the curves of DAS28(3) between responders and non-responders (Figure, left upper quadrant). Methotrexate PG levels increased till 24 weeks (mainly PG3 and PG4), with reasonable correlation between dose and MTX PG levels (r=0.38, p Conclusions Our study suggests that MTX-PG levels is not a determinant for response to MTX or their adverse effects. This is different from a previous prospective study, we think the differnce lies in MTX dose and clear classification as reponder and non-responders in our study. Disclosure of Interest None declared", "keywords": "", "authors": [ { "name": "Varun Dhir", "org": "Post Grad Inst Med Educ & Res, Internal Med Rheumatol Unit, Chandigarh, India" }, { "name": "Amit Sandhu", "org": "Post Grad Inst Med Educ & Res, Internal Med Rheumatol Unit, Chandigarh, India" }, { "name": "Archana Bhatnagar", "org": "Panjab Univ, Biochem, Chandigarh, India" }, { "name": "Veena Dhawan", "org": "Post Grad Inst Med Educ & Res, Chandigarh, India" }, { "name": "J. Kaur", "org": "GMCH 32, Chandigarh, India" }, { "name": "Ankita Sood", "org": "Post Grad Inst Med Educ & Res, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Post Grad Inst Med Educ & Res, Chandigarh, India" }, { "name": "Shefali Sharma", "org": "Post Grad Inst Med Educ & Res, Chandigarh, India" } ], "venue": "ANNALS OF THE RHEUMATIC DISEASES", "year": 2016 }, "1Lggtr2w": { "id": "1Lggtr2w", "title": "Salvage of renal allograft in mycotic pseudoaneurysm of the transplant renal artery", "abstract": "Abstract Mycotic pseudoaneurysm of transplant renal artery is a rare complication and warrants allograft nephrectomy. We report a 54-year-old renal allograft recipient who presented with 9.2 cm × 5.9 cm × 5.7 cm sized pseudoaneurysm of transplant renal artery. Blood culture grew Pseudomonas aeruginosa . The allograft was explanted, aneurysm was excised, and the allograft was reimplanted to right internal iliac artery with interposition of autogenous arterial graft. Microbiological examination of the aneurysm wall did not reveal active infection. The patient did well and at four years maintains normal renal function. Salvage of renal allograft is possible in selected patients with mycotic pseudoaneurysm of transplant renal artery.", "keywords": "", "authors": [ { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh 160012, India" }, { "name": "Sunil Kumar", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh 160012, India" }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh 160012, India" }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh 160012, India" }, { "name": "Deepesh B. Kenwar", "org": "Department of Renal Transplant Surgery, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh 160012, India" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "TYoardjl": { "id": "TYoardjl", "title": "Reasons for Low Utilization of Pancreas for Transplantation From Deceased Donors: Analysis of Data From a Single Center in India.", "abstract": "Pancreas retrieval rates remain low because of donor-related factors. Expansion of age limits and better donor management could improve pancreas transplant activity.", "keywords": "", "authors": [ { "name": "Milind Mandwar", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Abhinav Seth", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vidyasagar Kallepalli", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Gaurav Shankar Pandey", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sahil Rally", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vivek Thakur", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Shivakumar S Patil", "org": "Department of Renal Transplant Surgery, Nehru Building, Post Graduate Institute of Medical Education and Research, Chandigarh, India. Electronic address: drshivpgi@gmail.com." } ], "venue": "Transplantation proceedings", "year": 2020 }, "DMk7IFrI": { "id": "DMk7IFrI", "title": "Successful re‐transplantation in patient with recurrent parvovirus B19 pure red cell aplasia", "abstract": "", "keywords": "", "authors": [ { "name": "Neeraj Inamdar", "org": "Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ritambhara Nada", "org": "Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ranjana Minz", "org": "Department of Immunopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Transplant Surgery Post Graduate Institute of Medical Education and Research Chandigarh India" }, { "name": "Sarabpreet Singh", "org": "Department of Transplant Surgery Post Graduate Institute of Medical Education and Research Chandigarh India" }, { "name": "Ashish Sharma", "org": "Department of Transplant Surgery Post Graduate Institute of Medical Education and Research Chandigarh India" }, { "name": "Vivek Kumar", "org": "Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Manish Rathi", "org": "Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Harbir S Kohli", "org": "Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Raja Ramachandran", "org": "Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India" } ], "venue": "Transplant Infectious Disease", "year": 2019 }, "qtLZeubp": { "id": "qtLZeubp", "title": "012 RECURRENT URINARY TRACT INFECTIONS IN RENAL ALLOGRAFT TRANSPLANT RECIPIENTS – A RETROSPECTIVE ANALYSIS IN 870 PATIENTS", "abstract": "", "keywords": [], "authors": [ { "name": "sunil kumar", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "sanand bag", "org": "" } ], "venue": "", "year": 2011 }, "qmotUEYi": { "id": "qmotUEYi", "title": "An insight into the predisposing risk factors of pneumonia in renal transplant patients", "abstract": "", "keywords": [], "authors": [ { "name": "nikhil mahajan", "org": "" }, { "name": "mukut minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "deepesh b kenwar", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "sunil kumar", "org": "" }, { "name": "anil mani", "org": "" } ], "venue": "", "year": 2015 }, "Dh8dAq5f": { "id": "Dh8dAq5f", "title": "043 RENAL ALLOTRANSPLANTATION FOR IDIOPATHIC RETROPERITONEAL FIBROSIS", "abstract": "", "keywords": [], "authors": [ { "name": "sanand bag", "org": "" }, { "name": "sanand", "org": "" }, { "name": "minz", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "sarbpreet singh", "org": "" }, { "name": "sunil kumar", "org": "" } ], "venue": "", "year": 2011 }, "e4j2gQOG": { "id": "e4j2gQOG", "title": "A FHIR-Enabled Streaming Sepsis Prediction System for ICUs.", "abstract": "Sepsis is a common disease with very costly, potentially deadly implications. Early prediction of Sepsis and initiation of antibiotic is widely considered as an important determinant of patient survival. Cross-institutional validation and implementation of algorithms for early prediction of Sepsis at a minimum require common data formats, streaming analytic platforms for timely risk assessment, and interoperable and standardized interfaces. In this work we present an open-source cloud-based analytic pipeline, which receives de-identified patient data from an interoperable server and produces real-time Sepsis risk scores for Intensive Care Unit (ICU) patients.", "keywords": "", "authors": [ { "name": "Joel R. Henry", "org": "" }, { "name": "Dennis Lynch", "org": "" }, { "name": "Jeff Mals", "org": "" }, { "name": "Supreeth P. Shashikumar", "org": "" }, { "name": "Andre L. Holder", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Shamim Nemati", "org": "" } ], "venue": "EMBC", "year": 2018 }, "v0rlSqUY": { "id": "v0rlSqUY", "title": "On-demand big data integration: A hybrid ETL approach for reproducible scientific research", "abstract": "Scientific research requires access, analysis, and sharing of data that is distributed across various heterogeneous data sources at the scale of the Internet. An eager extract, transform, and load (ETL) process constructs an integrated data repository as its first step, integrating and loading data in its entirety from the data sources. The bootstrapping of this process is not efficient for scientific research that requires access to data from very large and typically numerous distributed data sources. A lazy ETL process loads only the metadata, but still eagerly. Lazy ETL is faster in bootstrapping. However, queries on the integrated data repository of eager ETL perform faster, due to the availability of the entire data beforehand. In this paper, we propose a novel ETL approach for scientific data integration, as a hybrid of eager and lazy ETL approaches, and applied both to data as well as metadata. This way, hybrid ETL supports incremental integration and loading of metadata and data from the data sources. We incorporate a human-in-the-loop approach, to enhance the hybrid ETL, with selective data integration driven by the user queries and sharing of integrated data between users. We implement our hybrid ETL approach in a prototype platform, Obidos, and evaluate it in the context of data sharing for medical research. Obidos outperforms both the eager ETL and lazy ETL approaches, for scientific research data integration and sharing, through its selective loading of data and metadata, while storing the integrated data in a scalable integrated data repository.", "keywords": "", "authors": [ { "name": "Pradeeban Kathiravelu", "org": "Université catholique de Louvain , " }, { "name": "Ashish Sharma", "org": "Emory University, School of Medicine" }, { "name": "Helena Galhardas", "org": "Universidade de Lisboa" }, { "name": "Peter Van Roy", "org": "Université Catholique de Louvain" }, { "name": "Luís Veiga", "org": "Universidade de Lisboa" } ], "venue": "Distributed and Parallel Databases", "year": 2019 }, "lO0jKCpu": { "id": "lO0jKCpu", "title": "The Emergence of Pathomics", "abstract": "Our goal is to provide an overview of machine learning methods and artificial intelligence in digital pathology image analysis. We also highlight novel visualization tools to interpret quantitative image-based pathomics data that is extracted from whole slide images to describe diverse phenotypic characteristics of cancer in a spectrum of tissues. Image analysis of tissues is based on the identification and classification of tissue, architectural elements, cells, nuclei, and other histologic features. We report emerging digital pathology image analysis applications to study several types and subtypes of cancer to complement traditional histopathologic evaluation. WSIs typically contain hundreds of thousands to millions of objects within a heterogeneous histologic landscape. Therefore, Pathomics represents an incredibly powerful emerging approach to classify cellular interactions and signaling by identifying relevant spatial relationships. The quantification of the intrinsic variability of different phenotypes and behavior in cancer is useful in analyzing and predicting clinical outcomes and treatment response.", "keywords": [ "Pathomics", " Deep learning image analysis", " Whole slide imaging", " Histopathology analytics" ], "authors": [ { "name": "Rajarsi Gupta", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, USA" }, { "name": "Tahsin Kurc", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, USA" }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Emory University, Atlanta, USA" }, { "name": "Jonas S. Almeida", "org": "National Cancer Institute Division of Cancer Epidemiology & Genetics, Bethesda, USA" }, { "name": "Joel Saltz", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, USA" } ], "venue": "Current Pathobiology Reports", "year": 2019 }, "MDTiKSOj": { "id": "MDTiKSOj", "title": "Early Prediction of Sepsis from Clinical Data: The PhysioNet/Computing in Cardiology Challenge 2019", "abstract": "", "keywords": "", "authors": [ { "name": "Matthew Reyna", "org": "" }, { "name": "Supreeth Prajwal Shashikumar", "org": "Georgia Institute of Technology" }, { "name": "Benjamin Moody", "org": "Massachusetts Institute of Technology" }, { "name": "Ping Gu", "org": "Emory University" }, { "name": "Ashish Sharma", "org": "Emory University" }, { "name": "shamim nemati", "org": "University of California, San Diego" }, { "name": "Gari Clifford", "org": "Emory University" } ], "venue": "computing in cardiology conference", "year": 2019 }, "ZNvWA0np": { "id": "ZNvWA0np", "title": "Data Services with Bindaas: RESTful Interfaces for Diverse Data Sources", "abstract": "The diversity of data management systems affords developers the luxury of building heterogeneous architectures to address the unique needs of big data. It allows one to mix-nmatch systems that can store, query, update, and process data based on specific use cases. However, this heterogeneity brings with it the burden of developing custom interfaces for each data management system. Existing big data frameworks fall short in mitigating these challenges imposed. In this paper, we present Bindaas, a secure and extensible big data middleware that offers uniform access to diverse data sources. By providing a RESTful web service interface to the data sources, Bindaas exposes query, update, store, and delete functionality of the data sources as data service APIs, while providing turn-key support for standard operations involving access control and audit-trails. The research community has deployed Bindaas in various production environments in healthcare. Our evaluations highlight the efficiency of Bindaas in serving concurrent requests to data source instances with minimal overheads.", "keywords": [ "Index Terms-Big data", "Service-Oriented Architecture (SOA)", "Web Services", "REST", "Data services" ], "authors": [ { "name": "Pradeeban Kathiravelu", "org": "Emory University Atlanta, Ga. ,USA" }, { "name": "Yusuf Nadir Saghar", "org": "Vanderbilt University; Nashville TN USA" }, { "name": "Tushar Aggarwal", "org": "BITS Pilani, Hyderabad Campus, India#TAB#" }, { "name": "Ashish Sharma", "org": "Emory University Atlanta, Ga. ,USA" } ], "venue": "", "year": 2019 }, "akdxXxmC": { "id": "akdxXxmC", "title": "On-Demand Service-Based Big Data Integration: Optimized for Research Collaboration.", "abstract": "Biomedical research requires distributed access, analysis, and sharing of data from various disperse sources in the Internet scale. Due to the volume and variety of big data, materialized data integration is often infeasible or too expensive including the costs of bandwidth, storage, maintenance, and management. Obidos (On-demand Big Data Integration, Distribution, and Orchestration System) provides a novel on-demand integration approach for heterogeneous distributed data. Instead of integrating data from the data sources to build a complete data warehouse as the initial step, Obidos employs a hybrid approach of virtual and materialized data integrations. By allocating unique identifiers as pointers to virtually integrated data sets, Obidos supports efficient data sharing among data consumers. We design Obidos as a generic service-based data integration system, and implement and evaluate a prototype for multimodal medical data.", "keywords": "", "authors": [ { "name": "Pradeeban Kathiravelu", "org": "Universidade de Lisboa" }, { "name": "Yiru Chen", "org": "Peking University" }, { "name": "Ashish Sharma", "org": "Emory University" }, { "name": "Helena Galhardas", "org": "" }, { "name": "Peter Van Roy", "org": "Université catholique de Louvain" }, { "name": "Luís Veiga", "org": "Universidade de Lisboa" } ], "venue": "DMAH@VLDB", "year": 2017 }, "aEFYCIy7": { "id": "aEFYCIy7", "title": "A Containerized Software System for Generation, Management, and Exploration of Features from Whole Slide Tissue Images.", "abstract": "Well-curated sets of pathology image features will be critical to clinical studies that aim to evaluate and predict treatment responses. Researchers require information synthesized across multiple biological scales, from the patient to the molecular scale, to more effectively study cancer. This article describes a suite of services and web applications that allow users to select regions of interest in whole slide tissue images, run a segmentation pipeline on the selected regions to extract nuclei and compute shape, size, intensity, and texture features, store and index images and analysis results, and visualize and explore images and computed features. All the services are deployed as containers and the user-facing interfaces as web-based applications. The set of containers and web applications presented in this article is used in cancer research studies of morphologic characteristics of tumor tissues. The software is free and open source. Cancer Res; 77(21); e79-82. ©2017 AACR.", "keywords": "", "authors": [ { "name": "Joel Saltz", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York. joel.saltz@stonybrookmedicine.edu." }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Emory University, Atlanta, Georgia." }, { "name": "Ganesh Iyer", "org": "Department of Biomedical Informatics, Emory University, Atlanta, Georgia." }, { "name": "Erich Bremer", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Feiqiao Wang", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Alina Jasniewski", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Tammy DiPrima", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Jonas S Almeida", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Yi Gao", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Tianhao Zhao", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." }, { "name": "Mary Saltz", "org": "Department of Radiology, Stony Brook University, Stony Brook, New York." }, { "name": "Tahsin Kurc", "org": "Department of Biomedical Informatics, Stony Brook University, Stony Brook, New York." } ], "venue": "Cancer research", "year": 2017 }, "3WOSUXHC": { "id": "3WOSUXHC", "title": "Data harmonization hurdles, lessons learned, and recommendations: An imaging study.", "abstract": "", "keywords": "", "authors": [ { "name": "Amrita Basu", "org": "White House Presidential Innovation Fellow, Washington DC, DC, US;" }, { "name": "Denise Warzel", "org": "National Cancer Institute, Rockville, MD;" }, { "name": "Justin S. Kirby", "org": "Leidos Biomedical Research, Inc., Reston, VA;" }, { "name": "Aras Eftekhari", "org": "National Cancer Institute, Rockville, MD;" }, { "name": "Janice Knable", "org": "National Cancer Institute, Rockville, MD;" }, { "name": "John Freymann", "org": "Leidos Biomedical Research, Inc., Reston, VA;" }, { "name": "Ashish Sharma", "org": "Emory University, Atlanta, GA;" }, { "name": "Tony Kerlavage", "org": "National Cancer Institute, Rockville, MD;" } ], "venue": "Journal of Clinical Oncology", "year": 2018 }, "xUYulHET": { "id": "xUYulHET", "title": "Spatial Organization and Molecular Correlation of Tumor-Infiltrating Lymphocytes Using Deep Learning on Pathology Images.", "abstract": "Beyond sample curation and basic pathologic characterization, the digitized H&E-stained images of TCGA samples remain underutilized. To highlight this resource, we present mappings of tumor-infiltrating lymphocytes (TILs) based on H&E images from 13 TCGA tumor types. These TIL maps are derived through computational staining using a convolutional neural network trained to classify patches of images. Affinity propagation revealed local spatial structure in TIL patterns and correlation with overall survival. TIL map structural patterns were grouped using standard histopathological parameters. These patterns are enriched in particular T cell subpopulations derived from molecular measures. TIL densities and spatial structure were differentially enriched among tumor types, immune subtypes, and tumor molecular subtypes, implying that spatial infiltrate state could reflect particular tumor cell aberration states. Obtaining spatial lymphocytic patterns linked to the rich genomic characterization of TCGA samples demonstrates one use for the TCGA image archives with insights into the tumor-immune microenvironment.", "keywords": [ "artificial intelligence", "bioinformatics", "computer vision", "deep learning", "digital pathology", "immuno-oncology", "lymphocytes", "machine learning", "tumor microenvironment", "tumor-infiltrating lymphocytes" ], "authors": [ { "name": "Joel Saltz", "org": "Department of Biomedical Informatics, Stony Brook Medicine, Stony Brook, NY 11794, USA. Electronic address: joel.saltz@stonybrookmedicine.edu." }, { "name": "Rajarsi Gupta", "org": "Department of Biomedical Informatics, Stony Brook Medicine, Stony Brook, NY 11794, USA; Department of Pathology, Stony Brook Medicine, Stony Brook, NY 11794, USA." }, { "name": "Le Hou", "org": "Department of Computer Science, Stony Brook University, Stony Brook, NY 11794, USA." }, { "name": "Tahsin Kurc", "org": "Department of Biomedical Informatics, Stony Brook Medicine, Stony Brook, NY 11794, USA." }, { "name": "Pankaj Singh", "org": "Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA." }, { "name": "Vu Nguyen", "org": "Department of Computer Science, Stony Brook University, Stony Brook, NY 11794, USA." }, { "name": "Dimitris Samaras", "org": "Department of Computer Science, Stony Brook University, Stony Brook, NY 11794, USA." }, { "name": "Kenneth R Shroyer", "org": "Department of Pathology, Stony Brook Medicine, Stony Brook, NY 11794, USA." }, { "name": "Tianhao Zhao", "org": "Department of Pathology, Stony Brook Medicine, Stony Brook, NY 11794, USA." }, { "name": "Rebecca Batiste", "org": "Department of Pathology, Stony Brook Medicine, Stony Brook, NY 11794, USA." }, { "name": "John Van Arnam", "org": "Department of Pathology and Laboratory Medicine, Perelman School at the University of Pennsylvania, Philadelphia, PA 19104, USA." }, { "name": "", "org": "" }, { "name": "Ilya Shmulevich", "org": "Institute for Systems Biology, Seattle, WA 98109, USA." }, { "name": "Arvind U K Rao", "org": "Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA." }, { "name": "Alexander J Lazar", "org": "Departments of Pathology, Genomic Medicine, and Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA." }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Emory University, Atlanta, GA 30322, USA." }, { "name": "Vésteinn Thorsson", "org": "Institute for Systems Biology, Seattle, WA 98109, USA. Electronic address: vesteinn.thorsson@systemsbiology.org." } ], "venue": "Cell reports", "year": 2018 }, "sDQUwaV2": { "id": "sDQUwaV2", "title": "Analytical Image Informatics", "abstract": "The systematic analysis of imaged pathology specimens often results in a vast amount of morphological information at both the cellular and sub-cellular scales. The information generated by this process has tremendous potential for providing insight regarding the underlying mechanisms of disease onset and progression. While microscopy scanners and computerized analysis are capable of capturing and analyzing data rapidly, microscopy image data remains underutilized in research and clinical settings. One major obstacle which tends to reduce wider adoption of these new technologies throughout the clinical and scientific communities is the challenge of managing, querying, and integrating the vast amounts of data resulting from the analysis of large digital pathology datasets. This paper presents a data model, which addresses these challenges, and demonstrates its implementation in a relational database system. Context:This paper describes a data model, referred to as Pathology Analytic Imaging Standards (PAIS), and a database implementation, which are designed to support the data management and query requirements of detailed characterization of micro-anatomic morphology through many interrelated analysis pipelines on whole slide images and tissue microarrays.", "keywords": "", "authors": [ { "name": "Fusheng Wang", "org": "" }, { "name": "Jun Kong", "org": "" }, { "name": "Lee Cooper", "org": "" }, { "name": "Tony Pan", "org": "" }, { "name": "Tahsin Kurc", "org": "" }, { "name": "Wenjin Chen", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Cristobal Niedermayr", "org": "" }, { "name": "Tae W Oh", "org": "" }, { "name": "Daniel Brat", "org": "" }, { "name": "Alton B Farris", "org": "" }, { "name": "David Foran", "org": "" }, { "name": "Joel Saltz", "org": "" } ], "venue": "", "year": 2011 }, "DtrDhJJ3": { "id": "DtrDhJJ3", "title": "Early Prediction of Sepsis From Clinical Data: The PhysioNet/Computing in Cardiology Challenge 2019.", "abstract": "Diverse computational approaches predict the onset of sepsis several hours before clinical recognition, but generalizability to different hospital systems remains a challenge.", "keywords": "", "authors": [ { "name": "Matthew A Reyna", "org": "Department of Biomedical Informatics, Emory University, Atlanta, GA." }, { "name": "Christopher S Josef", "org": "Department of Biomedical Informatics, Emory University, Atlanta, GA." }, { "name": "Russell Jeter", "org": "Department of Biomedical Informatics, Emory University, Atlanta, GA." }, { "name": "Supreeth P Shashikumar", "org": "Department of Biomedical Informatics, University of California San Diego, San Diego, CA." }, { "name": "M Brandon Westover", "org": "Department of Neurology, Massachusetts General Hospital, Boston, MA." }, { "name": "Shamim Nemati", "org": "Department of Biomedical Informatics, University of California San Diego, San Diego, CA." }, { "name": "Gari D Clifford", "org": "Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA." }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Emory University, Atlanta, GA." } ], "venue": "Critical care medicine", "year": 2019 }, "mSMjDRCE": { "id": "mSMjDRCE", "title": "The public cancer radiology imaging collections of The Cancer Imaging Archive", "abstract": "", "keywords": "", "authors": [ { "name": "Fred W. Prior", "org": "" }, { "name": "Kirk E. Smith", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Justin S. Kirby", "org": "" }, { "name": "Lawrence R. Tarbox", "org": "" }, { "name": "Kenneth W. Clark", "org": "" }, { "name": "William Bennett", "org": "" }, { "name": "Tracy S. Nolan", "org": "" }, { "name": "John Freymann", "org": "" } ], "venue": "Scientific Data", "year": 2017 }, "XbMDzcuI": { "id": "XbMDzcuI", "title": "Early Prediction of Sepsis From Clinical Data: The PhysioNet/Computing in Cardiology Challenge 2019", "abstract": "", "keywords": "", "authors": [ { "name": "Matthew A. Reyna", "org": "" }, { "name": "Christopher S. Josef", "org": "" }, { "name": "Russell Jeter", "org": "" }, { "name": "Supreeth P. Shashikumar", "org": "" }, { "name": "M. Brandon Westover", "org": "" }, { "name": "Shamim Nemati", "org": "" }, { "name": "Gari D. Clifford", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Critical Care Medicine", "year": 2020 }, "5lTKJIEQ": { "id": "5lTKJIEQ", "title": "A Cloud-based Framework for Implementing Portable Machine Learning Pipelines for Neural Data Analysis.", "abstract": "Cloud-based computing has created new avenues for innovative research. In recent years, numerous cloud-based, data analysis projects within the biomedical domain have been implemented. As this field is likely to grow, there is a need for a unified platform for the developing and testing of advanced analytic and modeling tools that enables those tools to be easily reused for biomedical data analysis by a broad set of users with diverse technical skills. A cloud-based platform of this nature could greatly assist future research endeavors. In this paper, we take the first step towards building such a platform. We define an approach by which containerized analytic pipelines can be distributed for use on cloud-based or on-premise computing platforms. We demonstrate our approach by implementing a portable biomarker identification pipeline using a logistic regression model with elastic net regularization (LR-ENR) and running it on Google Cloud. We used this pipeline for the diagnosis of Parkinson's disease based on a combination of clinical, demographic, and MRI-based features and for the identification of the most predictive biomarkers.", "keywords": "", "authors": [ { "name": "Charles A. Ellis", "org": "Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, 30332, Georgia" }, { "name": "Ping Gu", "org": "Department of Biomedical Informatics, Emory University, Atlanta, 30332, Georgia" }, { "name": "Mohammad S. Eslampanah Sendi", "org": "Department of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, 30313, Georgia" }, { "name": "Daniel Huddleston", "org": "Department of Neurology, Emory University School of Medicine, Atlanta, GA, 30322, United States" }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Emory University, Atlanta, 30332, Georgia" }, { "name": "Babak Mahmoudi", "org": "Department of Biomedical Informatics, Emory University, Atlanta, 30332, Georgia" } ], "venue": "EMBC", "year": 2019 }, "F9t44EMR": { "id": "F9t44EMR", "title": "A Dynamic Data Warehousing Platform for Creating and Accessing Biomedical Data Lakes.", "abstract": "Medical research use cases are population centric, unlike the clinical use cases which are patient or individual centric. Hence the research use cases require accessing medical archives and data source repositories of heterogeneous nature. Traditionally, in order to query data from these data sources, users manually access and download parts or whole of the data sources. The existing solutions tend to focus on a specific data format or storage, which prevents using them for a more generic research scenario with heterogeneous data sources where the user may not have the knowledge of the schema of the data a priori. In this paper, we propose and discuss the design, implementation, and evaluation of Data Café, a scalable distributed architecture that aims to address the shortcomings in the existing approaches. Data Café lets the resource providers create biomedical data lakes from various data sources, and lets the research data users consume the data lakes efficiently and quickly without having a priori knowledge of the data schema.", "keywords": "", "authors": [ { "name": "Pradeeban Kathiravelu", "org": "Department of Biomedical Informatics, Emory University, Atlanta, USA and INESC-ID Lisboa/Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal" }, { "name": "Ashish Sharma", "org": "Department of Biomedical Informatics, Emory University, Atlanta, USA" } ], "venue": "DMAH@VLDB", "year": 2016 }, "FclO8wI9": { "id": "FclO8wI9", "title": "PRISM: A Platform for Imaging in Precision Medicine.", "abstract": "PRISM is helping modernize, scale, and sustain the technology stack that powers TCIA. Repositories can take advantage of individual PRISM services such as de-identification and quality control. PRISM is helping scale image informatics for cancer research at a time when the size, complexity, and demands to integrate image data with other precision medicine data-intensive commons are mounting.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Emory University School of Medicine, Atlanta, GA." }, { "name": "Lawrence Tarbox", "org": "University of Arkansas for Medical Sciences, Little Rock, AR." }, { "name": "Tahsin Kurc", "org": "Stony Brook University, Stony Brook, NY." }, { "name": "Jonathan Bona", "org": "University of Arkansas for Medical Sciences, Little Rock, AR." }, { "name": "Kirk Smith", "org": "University of Arkansas for Medical Sciences, Little Rock, AR." }, { "name": "Pradeeban Kathiravelu", "org": "Emory University School of Medicine, Atlanta, GA." }, { "name": "Erich Bremer", "org": "Stony Brook University, Stony Brook, NY." }, { "name": "Joel H Saltz", "org": "Stony Brook University, Stony Brook, NY." }, { "name": "Fred Prior", "org": "University of Arkansas for Medical Sciences, Little Rock, AR." } ], "venue": "JCO clinical cancer informatics", "year": 2020 }, "2XP1FDHQ": { "id": "2XP1FDHQ", "title": "Apprehension in patient's mind: leading to myiasis.", "abstract": "A 65-year-old man had a history of acute urinary retention for which suprapubic catheterisation (SPC) was performed, following failed attempts at per urethral catheterisation by a local practitioner 3 months previously. He also had a history of hesitancy and intermittency for the past 1 year. He now presented with maggots discharging from the SPC site (figures 1 and 2). On taking a detailed history, he mentioned lack of local hygiene due to fear of dislodgement of SPC. There was no history of diabetes mellitus, surgical intervention or immune-compromised status.Figure 1 Clinical photograph of the patient showing the suprapubic catheterisation site wound with maggots inside it.Figure 2 Clinical photograph showing closer view of the suprapubic catheterisation site wound …", "keywords": [ "infections", "skin", "wound care" ], "authors": [ { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ruchir Aeron", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "CXplYZoT": { "id": "CXplYZoT", "title": "The diagnostic utility of serum ascites albumin gradient against ascitic fluid total protein for detection of liver disease in patients of ascites- A comparative study", "abstract": "Introduction: Various studies have demonstrated superiority of SAAG (serum ascites albumin gradient) in classifying ascites compared to transudate-exudate concept but with conflicting observations. Ascitic fluid total protein (AFTP) level in ascitic fluid is a much cheaper alternative to the serum ascites albumin gradient ratio. Hence in the study, we have compared the diagnostic accuracy of the old cheaper traditional method against the new method. Methods: Total 102 patients of Ascites were included in the study from J.A. group of hospital, G.R.Medical College (M.P.) in year 2013-15. All medical causes of ascites were included in our study and Non medical causes were excluded. The collected data was analyzed by using Pearson Chi-square statistical analysis to determine correlation between variables. Result: For prediction of liver disease it was found that SAAG was significantly (p value 0.0341) more predictive of Liver disease compared to AFTP. SAAG (p valueu003c0.0009) and AFTP (p value 0.49) were both significant for differentiating cause of ascites when comparison was done between liver and non-liver disease. Conclusion: AFTP is a good surrogate marker for detection of liver disease in ascites. AFTP is an excellent diagnostic test for detection of certain extra hepatic diseases leading to ascites like tubercular peritonitis sub-acute bacterial peritonitis and anaemia-hypo-proteinemia.e", "keywords": "", "authors": [ { "name": "Archana Kansal", "org": "" }, { "name": "Sandeep Aharwar", "org": "G. R .Medical College, Gwalior, M.P" }, { "name": "Sushma Trikha", "org": "G. R .Medical College, Gwalior, M.P" }, { "name": "Ashish Sharma", "org": "G. R .Medical College, Gwalior, M.P" }, { "name": "Shweta Sahai", "org": "G. R .Medical College, Gwalior, M.P" } ], "venue": "The Journal of medical research", "year": 2015 }, "Nv3A3fNa": { "id": "Nv3A3fNa", "title": "Pelvic hydatid: the great masquerader.", "abstract": "A 52-year-old man presented with urinary frequency and occasional lower abdominal pain for 4 months. His uroflow study and postvoid residual urine were normal and his digital rectal examination had grade 2 prostatic enlargement. His urinary symptoms were attributed to benign prostatic hyperplasia, and he was prescribed tamsulosin (0.4 mg) and solifenacin (5 mg) for his symptoms. One week later he only had partial relief of symptoms, thus an ultrasound was done that showed a cystic lesion abutting the urinary bladder in the region of right iliac fossa (figure 1). A contrast-enhanced CT (CECT) scan was then done, which showed a cystic lesion (3.8×4 cm) with enhancing internal septa and peripheral wall enhancement abutting the urinary bladder (figure 2). There was no other cyst in the abdomen so …", "keywords": [ "infectious diseases", "radiology", "urology" ], "authors": [ { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Vishwajeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "Nxii4c9F": { "id": "Nxii4c9F", "title": "Laparoscopic transperitoneal heminephrectomy for treatment of the nonfunctioning moiety of duplex kidney in adults: A case series.", "abstract": "Laparoscopic heminephrectomy is playing a cornerstone role in the treatment of the non-functioning moiety of duplex kidneys. The procedure is safe, efficient and offers the typical preoperative and postoperative benefits of laparoscopic surgery. The rate of complications in adults is acceptable and is similar to that reported in pediatric patients.", "keywords": [ "Adult", "Congenital abnormalities", "Kidney", "Laparoscopy" ], "authors": [ { "name": "Manmeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Apul Goel", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Manoj Kumar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satynarayan Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "Investigative and clinical urology", "year": 2019 }, "errKjumr": { "id": "errKjumr", "title": "Comparison of outcomes in malignant vs. non-malignant ischemic priapism: 12-year experience from a tertiary center.", "abstract": "Men with malignant priapism (CML) had significantly lower success rates with interventions, prolonged hospital stay, and higher complications than men with non-malignant priapism.", "keywords": "", "authors": [ { "name": "Manoj Kumar", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Manmeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Satya Narayan Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, India." } ], "venue": "Turkish journal of urology", "year": 2019 }, "qxPekozR": { "id": "qxPekozR", "title": "Acute mechanical duodenal obstruction due to giant hydronephrosis: an unusual cause of acute abdomen.", "abstract": "Giant hydronephrosis (GH) is a rare clinical entity with about 600 cases and defined as the adult renal pelvis containing greater than 1 L of fluid, or at least 1.6% of the body weight or kidney occupying the hemiabdomen. The pelvic-ureteric junction (PUJ) obstruction is the most frequent cause of GH. We thus report a case of massive abdominal distension due to GH secondary to PUJ obstruction who presented with acute duodenal obstruction due to extrinsic compression and was managed with percutaneous nephrostomy followed by open nephrectomy.", "keywords": [ "stomach and duodenum", "urological surgery", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "73NG7Bad": { "id": "73NG7Bad", "title": "Squamous cell carcinoma of skin due to prolonged indwelling percutaneous nephrostomy catheter.", "abstract": "Percutaneous nephrostomy (PCN) catheter placement is a commonly performed procedure in the urological practice for various indications like percutaneous nephrolithotomy, pyonephrosis, infected hydronephrosis and after failed attempt of ureteric stenting. The nephrostomy catheter is usually associated with low complication and morbidity rate, but prolonged indwelling nephrostomy tube may be hazardous in some cases. We hereby report a case of squamous cell carcinoma of skin around the PCN, which was attributed to chronic inflammation and persistent irritation from a long-term neglected indwelling nephrostomy catheter for last 3 years. The patient was managed with wide local excision of skin carcinoma and ureterocalicostomy for pelviureteric junction stricture. The authors report the first documented case with aforementioned presentation.", "keywords": [ "catheterisation / catheter care", "skin cancer", "surgical oncology", "unwanted effects / adverse reactions" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Vishwajeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2019 }, "IhWl56eV": { "id": "IhWl56eV", "title": "Are there any predictive risk factors for failure of ureteric stent in patients with obstructive urolithiasis with sepsis?", "abstract": "In patients with sepsis from obstructive urolithiasis due to larger and multiple calculi a PCN placement might be better suited although this data requires further prospective randomized studies to be extrapolated.", "keywords": [ "Percutaneous nephrostomy", "Sepsis", "Stent", "Ureter", "Urolithiasis" ], "authors": [ { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Deepanshu Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Manmeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "Investigative and clinical urology", "year": 2018 }, "sTmkbZHD": { "id": "sTmkbZHD", "title": "Posterior urethral valve presenting with impacted prostatic urethral calculus: a diagnostic challenge.", "abstract": "", "keywords": [ "radiology", "urological surgery", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Vishwajeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "5q6eSrYt": { "id": "5q6eSrYt", "title": "Incidentally detected adrenocortical carcinoma in familial adenomatous polyposis: an unusual presentation of a hereditary cancer syndrome.", "abstract": "A 30-year-old woman presented to us with complaints of intermittent bleeding per rectum, vague abdominal pain and altered bowel habits for last 3 months. There was no history of headache, palpitations, diarrhoea, weight loss, skin lesions, haematuria and hypertension. Her grandmother had history of colostomy for acute intestinal obstruction and died of unexplained cause at age of 55 years. Her laboratory investigations were normal. On digital rectal examination, multiple polypoidal firm masses were felt approximately 1–5 cm from anal verge. On colonoscopy, number of polyps were seen in the colon around 40–50 in number, ranging from few millimetres to largest measuring around 3 cm. These polyps spread over ascending to sigmoid colon and rectum in increasing number. The biopsy from these polyps was suggestive of tubular adenomas. A definitive diagnosis of familial adenomatous polyposis (FAP) was made. FAP is associated with a myriad of presentations, and hence, a thorough work up was done to elicit associated lesions. An upper gastrointestinal endoscopy was …", "keywords": [ "cancer - see oncology", "gastrointestinal system", "urology" ], "authors": [ { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Deepanshu Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "ojNuh9o7": { "id": "ojNuh9o7", "title": "Desire for lasting long in bed led to contact allergic dermatitis and subsequent superficial penile gangrene: a dreadful complication of benzocaine-containing extended-pleasure condom.", "abstract": "A 30-year-old non-atopic, non-diabetic man presented with complaints of swelling, pain and patchy blackening of penile skin for the last 3 days. He stated that for improving the duration of sexual intercourse and for better sexual performance, he recently used a new brand of condom, which contained 5% benzocaine. He, however, denied about the use of any lubricants or topical substance at the time of sexual act. There was no history of fever, inguinal or scrotal swelling, genital trauma, insect bite, known drug allergy, substance abuse or similar complaints in the past. In the past, he was using non-medicated natural rubber latex condom for contraception without any adverse effects. Local examination revealed vesicle eruption, sloughing and patchy blackening of penile skin extending from prepuce to base of penis with a clear demarcation line with non-palpable inguinal lymph nodes suggestive of allergic contact dermatitis as shown in figure 1. The underlying tunica albuginea, corpora cavernosa and corpora spongiosa were not involved. His routine blood/urine examination and screening work-up for sexually transmitted diseases was unremarkable. Swab culture from …", "keywords": [ "public health", "sexual health", "unwanted effects / adverse reactions", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "ETjwSdbY": { "id": "ETjwSdbY", "title": "Strangulated urethral prolapse in a postmenopausal woman presenting as acute urinary retention.", "abstract": "", "keywords": [ "urinary tract infections", "urological surgery" ], "authors": [ { "name": "Ashish Sharma", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Gaurav Garg", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Bhupendra Pal Singh", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "yxkqmnwL": { "id": "yxkqmnwL", "title": "Unplanned 30-day readmission rates in patients undergoing endo-urological surgeries for upper urinary tract calculi.", "abstract": "The readmission rates in endo-urological procedures for urolithiasis are less compared to other procedures. ASA class ≥3 is the most important independent predictor of unplanned 30-day readmissions.", "keywords": [ "Patient readmission", "Percutaneous nephrolithotomy", "Ureteroscopy", "Urinary calculi" ], "authors": [ { "name": "Manoj Kumar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Deepanshu Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "Investigative and clinical urology", "year": 2018 }, "cay6n42k": { "id": "cay6n42k", "title": "Special emphasis on bone health management in prostate cancer patients: a prospective longitudinal study.", "abstract": "Bone-directed therapy (Zoledronic acid) leads to both subjective and objective improvement in bone health of prostate cancer patients on ADT.", "keywords": [ "Longitudinal Studies", "Population Health Management", "Prostatic Neoplasms" ], "authors": [ { "name": "Ashish Sharma", "org": "King George's Medical University, Lucknow, India." }, { "name": "Rahul Janak Sinha", "org": "King George's Medical University, Lucknow, India." }, { "name": "Gaurav Garg", "org": "King George's Medical University, Lucknow, India." }, { "name": "Samarth Agarwal", "org": "King George's Medical University, Lucknow, India." }, { "name": "Asif Akhtar Statistician", "org": "King George's Medical University, Lucknow, India." }, { "name": "Vishwajeet Singh", "org": "King George's Medical University, Lucknow, India." } ], "venue": "International braz j urol : official journal of the Brazilian Society of Urology", "year": 2020 }, "CvxLBM8I": { "id": "CvxLBM8I", "title": "Giant urinary bladder (11 000 mL in volume) with bilateral lower limb oedema: an unusual cause of inferior vena cava obstruction.", "abstract": "An 80-year-old man with diabetes with history of spinal cord injury 15 years back now presented to us with complaints of painless progressive abdominal distension for 10 years and lower limb swelling for the last 4 months. He also had history of recurrent urinary infections, constipation, lower limb weakness, urinary incontinence, abdominal straining during micturition and voiding lower urinary tract symptoms. There was no history of fever, vomiting, breathlessness, weight loss and melena. On general physical examination, pitting oedema of both lower limbs was noticed. Abdominal examination revealed diffuse, symmetrical, non-tender, massive abdominal distension with shifting dullness and dilated superficial abdominal veins. On digital rectal examination, reduced anal tone was noted. Prostatic examination was unremarkable. Blood serum chemistries revealed uncontrolled diabetes (random blood sugar: 226 g/dL; haemoglobin A1c: 7.8%), mildly deranged renal function tests (blood urea nitrogen: 51 mg/dL; serum creatinine: 1.4 mg/dL) and a normal serum Prostate Specific Antigen (3.8 ng/mL). Other laboratory investigations including urine analysis and culture were unremarkable.Ultrasound of the abdomen suggested a large fluid-filled …", "keywords": [ "neurological injury", "urinary and genital tract disorders", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "sa2kX5mz": { "id": "sa2kX5mz", "title": "Rectal duplication cyst causing acute urinary retention with bladder outlet obstruction: an unusual presentation.", "abstract": "Anterior rectal duplication cyst is rare entity with <50 reported cases to date. It has myriad presentations like bleeding per rectum, constipation, rectal prolapsed and intestinal obstruction due to extrinsic compression of rectum. However, the association of enlarged duplication cyst compressing the bladder neck or ureter, and leading to bladder outlet obstruction or hydroureteronephrosis is extremely rare with only a handful of reported cases. We report a rare case of large anterior rectal duplication cyst in a young girl leading to acute urinary retention with bladder outlet obstruction which was eventually managed by laparoscopic-assisted transabdominal surgical excision of the cyst. The authors believe that such an association has not been previously reported in this age group.", "keywords": [ "gastrointestinal surgery", "urological surgery", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Manoj Kumar", "org": "Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Urology, CSM Medical University (Upgraded KGMC), Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2019 }, "4DLiH6M2": { "id": "4DLiH6M2", "title": "Outcomes of patients with Fournier's Gangrene: 12-year experience from a tertiary care referral center.", "abstract": "An advanced age, diabetes mellitus, renal impairment, leukocytosis, altered sensorium, shock at presentation, deranged international normalized ratios, and high FGSI and ACCI scores can be used as predictors for poor response. FG risk scores adequately characterize the severity and prognosis of FG, but clinician's judgement is vital. The management comprises of a multidisciplinary approach, including parenteral antibiotics, urgent surgical debridement, and comorbidities optimization.", "keywords": "", "authors": [ { "name": "Gaurav Garg", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Vishwajeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, India." } ], "venue": "Turkish journal of urology", "year": 2019 }, "orIDQKKg": { "id": "orIDQKKg", "title": "Medullary sponge kidney and Caroli's disease in a patient with stricture urethra: look for the hidden in presence of the apparent.", "abstract": "Caroli's disease is a rare congenital disorder with incidence rate of approximately 1 in 1 000 000 population. Renal anomalies which may be associated with Caroli's disease include medullary sponge kidney (MSK), cortical cysts, adult recessive polycystic kidney disease and rarely autosomal dominant polycystic kidney disease. Exact incidence of MSK in patients of Caroli's disease is not known. There are only a handful of reported cases of this association in literature. We hereby report a case of Caroli's disease with MSK with nephrocalcinosis. He presented to primary health centre with symptoms of urethral stricture due to lichen sclerosus et atrophicus and was managed with repeated co-axial dilatation but was never evaluated for underlying chronic renal insufficiency due to MSK. The thorough clinical examination and proper evaluation is important in patient of urethral stricture with underlying chronic renal insufficiency to avoid delayed diagnosis, management and related complications.", "keywords": [ "chronic renal failure", "congenital disorders", "pancreas and biliary tract", "radiology", "urology" ], "authors": [ { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Vishwajeet Singh", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "ye1zNQLZ": { "id": "ye1zNQLZ", "title": "Isolated Fournier's gangrene of the penis with penile autoamputation.", "abstract": "A 65-year-old non-diabetic man presented to us with blackish discolouration of his penile shaft for 10 days (figures 1 and 2). He had undergone total thyroidectomy for follicular carcinoma of the thyroid gland 2 weeks previously. Intraoperatively, failed attempts were made to catheterise the patient. These attempts were traumatic, and a suprapubic catheter was hence placed. Following this, he developed inflammation and oedema on his penile shaft which then gradually started turning black for which he came to us. A diagnosis of isolated Fournier’s gangrene of penis was made. Debridement was done, and the patient was advised regular dressings. During the initial debridement, the tunica albuginea and corpus cavernosa were not excised although the patient had slight gangrenous changes over the cavernosa. Later, gradually, a line of demarcation developed, and there was autoamputation of the involved shaft, 2 weeks after the initial …", "keywords": [ "catheterisation / catheter care", "urological surgery" ], "authors": [ { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Deepanshu Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "KU6I16lX": { "id": "KU6I16lX", "title": "Role of gemcitabine and cisplatin as neoadjuvant chemotherapy in muscle invasive bladder cancer: Experience over the last decade", "abstract": "Abstract Objective Neoadjuvant chemotherapy followed by radical cystectomy is considered the standard of care for patients with muscle invasive bladder cancer. In the last decade, interest in neoadjuvant chemotherapy has slowly shifted from methotrexate, vinblastine, doxorubicin and cisplatin regime to gemcitabine and cisplatin regime. There are many publications on gemcitabine and cisplatin regime in literature which cover different aspects of treatment. This review aims to summarise the findings published so far on gemcitabine and cisplatin regime and present it in a concise manner. Methods A systematic literature review was conducted searching the PubMed ® database in December 2016 using the medical subject heading (MeSH) with the terms gemcitabine, cisplatin, chemotherapy, muscle invasive bladder cancer, and neoadjuvant. All relevant studies were included and results were analysed. Results A total of 13 studies were included which published between 2007 and 2015. These 13 studies comprised of 754 subjects suffering from muscle invasive bladder cancer. The proportion of male patients ranged from 60% to 86.4% and the median age ranged from 54.2 to 77.3 years in various studies. Complete pathological response (pT0) was seen in 30.0% of patients and pathological downstaging ( Conclusion As per latest guidelines, neoadjuvant chemotherapy is recommended for patients with muscle invasive bladder cancer. There is substantial pathological downstaging with low toxicity in patients of muscle invasive bladder cancer who receive neoadjuvant gemcitabine and cisplatin regime.", "keywords": "", "authors": [ { "name": "Sunny Goel", "org": "Department of Urology, King George Medical University, Lucknow, India" }, { "name": "Rahul Janak Sinha", "org": "Department of Urology, King George Medical University, Lucknow, India" }, { "name": "Ved Bhaskar", "org": "Department of Urology, King George Medical University, Lucknow, India" }, { "name": "Ruchir Aeron", "org": "Department of Urology, King George Medical University, Lucknow, India" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Vishwajeet Singh", "org": "Department of Urology, King George Medical University, Lucknow, India" } ], "venue": "Asian Journal of Urology", "year": 2018 }, "05UBUViV": { "id": "05UBUViV", "title": "Post-traumatic bilateral vesicocutaneous fistula of thighs treated with buccal mucosa graft urethroplasty and cyanoacrylate glue instillation: a novel treatment for management of a complicated fistula.", "abstract": "Post-traumatic vesicocutaneous fistula (VCF) is a rare variant of urinary fistulas. These fistulas may externally communicate to abdomen, perineum, buttocks, scrotum or very rarely thigh. These fistulas usually develop at a variable time duration after trauma and are usually preceded with thigh swelling or abscess formation followed by spontaneous rupture. We, hereby, report a case of VCF of bilateral thighs with associated penobulbar urethral stricture after road traffic accident which was managed with dual modality of buccal mucosa graft urethroplasty surgery and cyanoacrylate glue injection in the fistulous tracts. To the best of our knowledge, this is first report of bilateral VCFs communicating externally to thighs. In literature, very few cases of VCFs of thigh are reported and are rarely managed with adhesive glue application.", "keywords": [ "catheterisation / catheter care", "urinary tract infections", "urological surgery", "urology" ], "authors": [ { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Akansha Gupta", "org": "Obstetrics and Gynaecology, Jolly Grant Medical College, New Delhi, India." }, { "name": "Satya Narayan Sankwar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "1SakbclC": { "id": "1SakbclC", "title": "Purple urinary bag syndrome: what every primary healthcare provider should know.", "abstract": "A 70-year-old man with bladder outlet obstruction due to benign prostatic hyperplasia who was on urethral (Foley) catheter presented to us with complaint of purple discoloration of his urine collection bag (figure 1). He had history of multiple failed trials of voiding without catheter. Along with this he had constipation for which he was already taking laxatives. He was on Foley catheter for 6 months (which was changed every 3 weeks) and now was planned for transurethral resection of prostate (TURP). He was alarmed by this discolouration. His urine was clear but the urine collection bag had a purple discolouration. On microscopic examination, his urine had plenty of leucocytes and his urinary pH was 8. His urine culture was positive for Escherichia coli …", "keywords": [ "catheterisation / catheter care", "urinary tract infections" ], "authors": [ { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Tushar Pandey", "org": "Department of Pathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "hOQzV4ze": { "id": "hOQzV4ze", "title": "Air in the urine: a mystified patient and a concerned surgeon.", "abstract": "Appendicovesical fistula is a rare type of enterovesical and a very rare complication of acute appendicitis. Herein, we report a case of a 22-year-old man who presented with cloudy urine and pneumaturia with a prior history of acute appendicitis. Imaging techniques including ultrasonography, CT and cystoscopy were performed to diagnose the abnormality. Diagnosis of this fistula is challenging and relies on detailed history and radiological imaging.", "keywords": [ "general surgery", "urological surgery", "urology" ], "authors": [ { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Department of Urology, CSM Medical University (Upgraded KGMC), Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2019 }, "CO9M6Xsj": { "id": "CO9M6Xsj", "title": "Primary prostatic extra-gastrointestinal stromal tumor causing giant prostatomegaly", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Gaurav Garg", "org": "" }, { "name": "SatyaNarayan Sankhwar", "org": "" } ], "venue": "Indian Journal of Urology", "year": 2019 }, "oPbutxm1": { "id": "oPbutxm1", "title": "Deep infiltrating endometriosis of the uterus involving the urinary bladder.", "abstract": "A 35-year-old female patient, married with two children, presented to us with complaints of haematuria for the last 1 week which was sudden in onset, painless and intermittent. She had lower abdominal pain 6 months ago when she was evaluated and diagnosed as a case of uterine endometriosis for", "keywords": [ "hematuria", "urological surgery", "urology" ], "authors": [ { "name": "Samarth Agarwal", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Manoj Kumar", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Satyanarayan Sankhwar", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "CXfD6QYz": { "id": "CXfD6QYz", "title": "Sofosbuvir and Ribavirin Combination is Safe and Effective in Renal Transplant Recipients with HCV Infection", "abstract": "", "keywords": "", "authors": [ { "name": "Sunil Taneja", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ajay Duseja", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Arka De", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Vivek Kumar", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Radha K. Dhiman", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Krishan L. Gupta", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Mukut Minz", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Yogesh Chawla", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" } ], "venue": "Journal of clinical and experimental hepatology", "year": 2016 }, "xqcAH5ME": { "id": "xqcAH5ME", "title": "Pretransplant HbA1c and Glucose Metabolism Parameters in Predicting Posttransplant Diabetes Mellitus and Their Course in the First 6 Months After Living-Donor Renal Transplant.", "abstract": "Posttransplant diabetes mellitus is a common and serious metabolic complication after renal transplant. Patients with uremia are known to have abnormal glucose metabolism characterized by insulin resistance and defects in insulin secretion, which are ameliorated to some extent with renal replacement therapy and more so with renal transplant. However, the diabetogenicity of calcineurin inhibitors compounds this state of dysglycemia and promotes the development of diabetes in some patients. It is not clear whether pretransplant dysglycemia is a risk factor for posttransplant diabetes mellitus and, if so, which between insulin resistance and pancreatic β-cell dysfunction is a major determinant in predicting posttransplant diabetes mellitus. Here, we examined the roles of the pretransplant oral glucose tolerance test, glycated hemoglobin (HbA1c) levels, and homeostatic model assessment-derived insulin resistance and beta-cell function in the prediction of posttransplant diabetes mellitus and the course of these indexes posttransplant. Our aim was to examine the correlations between these factors and their changes posttransplant with the development of posttransplant diabetes mellitus.Pretransplant fasting blood was drawn from patients for plasma glucose, insulin, C-peptide, and HbA1c levels, which was followed by a 2-hour oral glucose tolerance test. After transplant, patients were followed for 6 months to detect posttransplant diabetes mellitus. Serum insulin, C-peptide, and glycated hemoglobin levels were reexamined in patients with posttransplant diabetes mellitus at 1 and 6 months.Twenty-one patients (29%) developed posttransplant diabetes mellitus. Pretransplant HbA1c was associated with development of posttransplant diabetes mellitus (odds ratio 27.04) on logistic regression. Homeostatic model assessment-derived insulin resistance improved significantly at 6 months posttransplant, whereas beta-cell function remained lower than pretransplant levels in patients with posttransplant diabetes mellitus.Pretransplant HbA1c may be used as a predictive marker for posttransplant diabetes mellitus. Insulin resistance but not beta-cell function improves in patients with posttransplant diabetes mellitus at 6 months posttransplant.", "keywords": "", "authors": [ { "name": "Namrata Rao", "org": "From the Department of Nephrology, Postgraduate Institute of Medical Education & Research, Chandigarh, India 160012." }, { "name": "Manish Rathi", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Raja Ramachandran", "org": "" }, { "name": "Vivek Kumar", "org": "" }, { "name": "Harbir Singh Kohli", "org": "" }, { "name": "Krishan Lal Gupta", "org": "" }, { "name": "Vinay Sakhuja", "org": "" } ], "venue": "Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation", "year": 2017 }, "UcXhXvDU": { "id": "UcXhXvDU", "title": "Poor allograft outcome in Indian patients with post-transplant C3 glomerulopathy", "abstract": "", "keywords": "", "authors": [ { "name": "Ashwani Kumar", "org": "Department of Histopathology, PGIMER Chandigarh, India" }, { "name": "Raja Ramachandran", "org": "Department of Nephrology, PGIMER, Chandigarh, India" }, { "name": "Amit Rawat", "org": "Department of Pediatrics, PGIMER Chandigarh India" }, { "name": "Reena Das", "org": "Department of Hematology PGIMER Chandigarh India" }, { "name": "Charan S Rayat", "org": "Department of Histopathology, PGIMER Chandigarh, India" }, { "name": "Deepesh B Kenwar", "org": "Department of Transplant Surgery, PGIMER, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Department of Transplant Surgery, PGIMER, Chandigarh, India" }, { "name": "Krishan L Gupta", "org": "Department of Nephrology, PGIMER, Chandigarh, India" }, { "name": "Ritambhra Nada", "org": "Department of Histopathology, PGIMER Chandigarh, India" } ], "venue": "", "year": 2019 }, "rgRC8zZb": { "id": "rgRC8zZb", "title": "206.5: Impact of dengue screening prior to renal transplant - A single center experience.", "abstract": "", "keywords": "", "authors": [ { "name": "Vidyasagar Kallepalli", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Deepesh B Kenwar", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Kohli H S", "org": "" }, { "name": "Mini P Singh", "org": "" }, { "name": "Vikas Suri", "org": "" }, { "name": "Shiva Kumar S P", "org": "" } ], "venue": "Transplantation", "year": 2019 }, "vtjLZXCP": { "id": "vtjLZXCP", "title": "\"Chylous Ascites: Complication of laparoscopic donor nephrectomy. Case Report and review of literature.\"", "abstract": "Chylous ascites is a rare complication after donor nephrectomy in experienced centers. While conservative management remains the first line of treatment, early surgical treatment shall be undertaken in cases of massive ascites.", "keywords": "", "authors": [ { "name": "Abhinav Seth", "org": "1 Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "" }, { "name": "Deepesh Benjamin Kenwar", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Abhinav Seth", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Deepesh Benjamin Kenwar", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Sarbpreet Singh", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Transplantation", "year": 2018 }, "DhLO8yoM": { "id": "DhLO8yoM", "title": "Dengue in the Renal Transplant Population - A Single Center Experience", "abstract": "", "keywords": "", "authors": [ { "name": "Deepesh B. Kenwar", "org": "" }, { "name": "Vidyasagar Kallepalli", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Navdeep Singh", "org": "" }, { "name": "Kunal Kapoor", "org": "" }, { "name": "Sandeep Chamb", "org": "" } ], "venue": "Transplantation", "year": 2018 }, "gtOB9EnJ": { "id": "gtOB9EnJ", "title": "RETROPERITONEAL SINGLE PORT VERSUS TRANSPERITONEAL MULTIPORT DONOR NEPHRECTOMY: A PROSPECTIVE RANDOMISED CONTROL TRIAL.", "abstract": "- Retroperitoneal group experienced lesser pain (VAS score 0.3±0.3 vs 1.1±0.0,p 0.000),lesser analgesic requirement (186±51.07 vs 254±62.7 mg, p0.000), faster convalescence (7.0±3.0 vs 10.7±3.3 days, p 0.00) related to smaller cumulative incision(7.8±0.8vs12.4±2.0 cm,p0.00), and had reduced operative time (142±26.2 vs170.8±34.75 min, p 0.001) and blood loss. Other recorded parameters were similar in both the groups. Conclusion- Single port retroperitoneal approach significantly reduced postoperative pain and hastened recovery when compared to a transperitoneal approach. Converting to a retroperitoneal approach presents an opportunity for surgeons to further reduce morbidity associated with the donor nephrectomy.", "keywords": "", "authors": [ { "name": "Neelam Chauhan", "org": "Post Graduate Institute of Medical Education and Research, 29751, Chandigarh, Chandigarh, India ; neel.dr.lh@gmail.com." }, { "name": "Deepesh Benjamin Kenwar", "org": "Post Graduate Institute of Medical Education and Research, 29751, Chandigarh, Chandigarh, India ; nav8203@gmail.com." }, { "name": "Navdeep Singh", "org": "Post Graduate Institute of Medical Education and Research, 29751, Renal transplant surgery , C block,1st floor above AKU , Chandigarh, chandigarh, India , 160012 ; nav8203@yahoo.co.in." }, { "name": "Sarbpreet Singh", "org": "Postgraduate Institute of Medical Education and Research, Transplant Surgery , Sector 12 , Chandigarh , Chandigarh, India , 160012 ; ashish_chd@hotmail.com." }, { "name": "Ashish Sharma", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, chandigarh, India ; drsarbpreet@yahoo.com." }, { "name": "Kunal Kapoor", "org": "Postgraduate institute of medical education and research , chandigarh, India ; dockunalkapoor@gmail.com." }, { "name": "Sandeep Kumar", "org": "postgraduate institute of medical education and research, chandigarh, India ; sandeepkchamba@gmail.com." } ], "venue": "Journal of endourology", "year": 2018 }, "JVA0A2lP": { "id": "JVA0A2lP", "title": "Cincinnati protocol is not suitable for Indian patients with antibody mediated renal allograft rejection", "abstract": "", "keywords": "", "authors": [ { "name": "KrishanLal Gupta", "org": "" }, { "name": "Jasmine Sethi", "org": "" }, { "name": "Vivek Kumar", "org": "" }, { "name": "Manish Rathi", "org": "" }, { "name": "Hs Kohli", "org": "" }, { "name": "Ritambhra Nada", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Saudi Journal of Kidney Diseases and Transplantation", "year": 2019 }, "dO5h8nK9": { "id": "dO5h8nK9", "title": "Study of oxidative stress biomarkers to predict ischemia reperfusion injury and its effects in renal allograft transplant recipients", "abstract": "", "keywords": "", "authors": [ { "name": "Sunil Kumar", "org": "" }, { "name": "Ravi Dhital", "org": "" }, { "name": "Ujjawal Sharma", "org": "" }, { "name": "Navdeep Singh", "org": "" }, { "name": "Soham Dasgupta", "org": "" }, { "name": "Seetharam Tejavath", "org": "" }, { "name": "Kunal Kapoor", "org": "" }, { "name": "Jivtesh Singh", "org": "" }, { "name": "Vinay", "org": "" }, { "name": "Praveen", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Deepesh B. Kenwar", "org": "" }, { "name": "Ritambhra Nada", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Rajender Prasad", "org": "" }, { "name": "Mukut Minz", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "2bEp6Glc": { "id": "2bEp6Glc", "title": "Allo-specific immune response profiles indicative of acute rejection in kidney allografts using an in vitro lymphocyte culture-based model.", "abstract": "Ability to predict the manner in which a recipient's immune system would respond to a transplanted graft by analyzing cytokine profiles of the \"allograft antigen sensitized\" recipient lymphocytes in vitro might provide a means to identify patients at risk to adverse clinical endpoints.Cytokine/chemokine gene expression profiles of peripheral blood mononuclear cells co-cultured with allograft antigen-pulsed macrophages were studied in 49 renal transplant recipients-12 with acute cellular rejection (ACR) with or without antibody-mediated rejection (AMR), 7 with AMR (without ACR), and 30 with stable allografts (SA). An 86-gene inflammatory cytokines and receptors PCR array was used to measure fold changes in gene expression between pulsed and un-pulsed cultures.On linear discriminant analysis and multivariate analysis of variance, a gene set comprising C3, CCL3, IL1B, TOLLIP, IL10, CXCL5, ABCF1, CCR3, IL10RB, CXCL1, and IL1R1 differentiated the ACR-AMR from the SA group. Similarly, a gene set comprising IL10, C3, IL37, IL1B, CCL3, CARD18, and TOLLIP differentiated the AMR from the SA group. No significant difference was found between the ACR-AMR vs AMR groups.Distinct post in vitro stimulation cytokine profiles at the time of transplantation thus correlated with the occurrence of post-transplantation rejection episodes which indicated feasibility of this in vitro model to assess the recipient's anti-graft response at an early stage.", "keywords": [ "Acute rejection", "In vitro culture model", "Kidney transplant", "Molecular diagnosis", "PCR array" ], "authors": [ { "name": "Sobhana Mahakur", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India." }, { "name": "Biman Saikia", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India. bimansaikia@gmail.com." }, { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ranjana W Minz", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India." }, { "name": "Ritambhra Nada", "org": "Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Shashi Anand", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vivekanand Jha", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Neha Joshi", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India." }, { "name": "Lekha Goel", "org": "Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India." }, { "name": "Amit Arora", "org": "Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Kusum Joshi", "org": "Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Clinical and experimental nephrology", "year": 2017 }, "B1yTUI78": { "id": "B1yTUI78", "title": "Clinical profile, risk factor, diagnosis, treatment and outcome of post renal transplant tuberculosis from a single centre", "abstract": "", "keywords": "", "authors": [ { "name": "Sahil Bagai", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Harsha Kumar", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Vivek Kumar", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Manish Rathi", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Harbir Singh Kohli", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Kl Gupta", "org": "Postgraduate Institute of Medical Education and Research, Chandigarh, India" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "xpHLuPYj": { "id": "xpHLuPYj", "title": "Successful treatment of chronic hepatitis C infection with directly acting antivirals in renal transplant recipients.", "abstract": "DAAs including Sofosbuvir, Daclatasvir and Ledipasvir with or without ribavirin are safe and effective for the treatment of chronic hepatitis C in renal transplant recipients.", "keywords": [ "directly acting antivirals", "end stage renal disease", "hepatitis C", "renal transplantation", "sustained virological response" ], "authors": [ { "name": "Sunil Taneja", "org": "Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ajay Duseja", "org": "Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Arka De", "org": "Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Vivek Kumar", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Raja Ramachandran", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Radha K Dhiman", "org": "Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Krishan L Gupta", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Yogesh Chawla", "org": "Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Nephrology (Carlton, Vic.)", "year": 2018 }, "itEHRfp3": { "id": "itEHRfp3", "title": "Opportunistic infections occurring in renal transplant recipients in tropical countries", "abstract": "", "keywords": "", "authors": [ { "name": "KrishanLal Gupta", "org": "" }, { "name": "Sahil Bagai", "org": "" }, { "name": "Kiran Joshi", "org": "" }, { "name": "Manish Rathi", "org": "" }, { "name": "HarbirSingh Kohli", "org": "" }, { "name": "Vivekanand Jha", "org": "" }, { "name": "Vinay Sakhuja", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Mukut Minz", "org": "" }, { "name": "Arunaloke Chakrabarti", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2019 }, "JjWVY5y2": { "id": "JjWVY5y2", "title": "Retroperitoneal single port donor nephrectomy through lumbotomy incision – A novel approach", "abstract": "", "keywords": "", "authors": [ { "name": "Navdeep Singh", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Deepesh Kenwer", "org": "" }, { "name": "Sunil Kumar", "org": "" }, { "name": "Mukut Minz", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "9rxFaG6L": { "id": "9rxFaG6L", "title": "Curcumin Mediated Attenuation of Carbofuran Induced Oxidative Stress in Rat Brain.", "abstract": "The indiscriminate use of carbofuran to improve crop productivity causes adverse effects in nontargets including mammalian systems. The objective of this study was to evaluate carbofuran induced oxidative stress in rat brain stem and its attenuation by curcumin, a herbal product. Out of 6 groups of rats, 2 groups received two different doses of carbofuran, that is, 15 and 30% of LD50, respectively, for 30 days. Out of these, 2 groups receiving same doses of carbofuran were pretreated with curcumin (100 mg/kg body weight). The levels of antioxidants, TBARS, GSH, SOD, catalase, and GST were determined in rat brain stem. The 2 remaining groups served as placebo and curcumin treated, respectively. The data suggested that carbofuran at different doses caused significant alterations in the levels of TBARS and GSH in dose dependent manner. The TBARS and GSH contents were elevated. The activities of SOD, catalase, and GST were significantly inhibited at both doses of carbofuran. The ratio of P/A was also found to be sharply increased. The pretreatment of curcumin exhibited significant protection from carbofuran induced toxicity. The results suggested that carbofuran at sublethal doses was able to induce oxidative stress in rat brain which could be attenuated by curcumin.", "keywords": "", "authors": [ { "name": "Sunil Kumar Jaiswal", "org": "Univ Allahabad, Dept Biochem, Allahabad 211002, Uttar Pradesh, India" }, { "name": "Ashish Sharma", "org": "Univ Allahabad, Dept Biochem, Allahabad 211002, Uttar Pradesh, India" }, { "name": "Vivek Kumar Gupta", "org": "Univ Allahabad, Dept Biochem, Allahabad 211002, Uttar Pradesh, India" }, { "name": "Rakesh Kumar Singh", "org": "KLPG Coll, Dept Chem, Allahabad 211008, Uttar Pradesh, India" }, { "name": "Bechan Sharma", "org": "Univ Allahabad, Dept Biochem, Allahabad 211002, Uttar Pradesh, India" } ], "venue": "BIOCHEMISTRY RESEARCH INTERNATIONAL", "year": 2016 }, "DqMqV2qU": { "id": "DqMqV2qU", "title": "Correlation of Pretransplant Glucose Metabolism and Nonalcoholic Fatty Liver Disease with the Development of Post Transplantation Diabetes Mellitus", "abstract": "", "keywords": "", "authors": [ { "name": "Sahil Bagai", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Ajay Duseja", "org": "" }, { "name": "Naresh Sachdeva", "org": "" }, { "name": "Krishan L. Gupta", "org": "" }, { "name": "Manish Rathi", "org": "" } ], "venue": "Transplantation", "year": 2018 }, "Bwo1D7Jt": { "id": "Bwo1D7Jt", "title": "En-bloc kidney transplant from an 11-month-old pediatric donor to an adult recipient: Case report and review of literature", "abstract": "", "keywords": "", "authors": [ { "name": "Sarbpreet Singh", "org": "" }, { "name": "GauravShankar Pandey", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "DeepeshBenjamin Kenwar", "org": "" }, { "name": "Abhinav Seth", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2019 }, "pg0Fvy8B": { "id": "pg0Fvy8B", "title": "A Single Center Experience with Post Transplant Tuberculosis in a Developing Country", "abstract": "", "keywords": "", "authors": [ { "name": "Deepesh B. Kenwar", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Navdeep Singh", "org": "" }, { "name": "Kunal Kapoor", "org": "" } ], "venue": "Transplantation", "year": 2018 }, "yxTwBMzF": { "id": "yxTwBMzF", "title": "Predictors of allograft survival and patient survival in living donor renal transplant recipients", "abstract": "Background: Living donor renal transplantation is the dominant type of renal transplantation in developing countries such as India. We looked at factors affecting allograft and patient survival in such circumstances as these could be different owing to unique socioeconomic, demographic, and patient characteristics. Methods: We retrospectively analyzed data of living donor renal transplantation done at Postgraduate Institute of Medical Education and Research, Chandigarh, over 5 years (2002–2007) to ascertain the factors that affect allograft and patient survival. The relationship of pretransplant characteristics of patient and donor, comorbid conditions, posttransplant immunosuppressive drug regimens, and infectious and noninfectious complications to allograft survival and patient survival were assessed. Results: A total of 554 living donor renal transplantation surgeries were performed during this period. Rates of death-censored renal allograft survival at 1, 3, and 5 years after transplant were 94%, 90%, and 79%, respectively. Independent predictors of death-censored graft loss were BK virus nephropathy, episodes of rejection, and use of immunosuppressive drug protocols other than triple drug regimen of tacrolimus, mycophenolate mofetil, and prednisolone. The patient survival at 1, 3, and 5 years after transplant in our study was 92%, 87%, and 83%, respectively. Presence of cytomegalovirus disease, recipient age ≥50 years, unrelated transplant (spousal donor or donor beyond first-degree relative), and presence of any opportunistic infection were found to be significant independent predictors of patient survival. Conclusions: Although retrospective, our data have shown comparable rates for allograft and patient survival for living donor renal transplantation in India.", "keywords": "", "authors": [ { "name": "Pinaki Mukhopadhyay", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Kshama Gupta", "org": "" }, { "name": "Vivek Kumar", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Manish Rathi", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Mukut Minz", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Harbir Singh Kohli", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Vivekanand Jha", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India" }, { "name": "Vinay Sakhuja", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India" } ], "venue": "Indian Journal of Transplantation", "year": 2017 }, "bUe2YHnO": { "id": "bUe2YHnO", "title": "OR19 Quantification of peripheral B-cell subsets in acute allograft rejection in recipients with renal transplantation", "abstract": "Aim To monitor B cell subsets in peripheral circulation to find a distinctive phenotypic signature of rejection in our cohort. Methods The study population consisted of 211 consecutive first renal allograft recipients who were followed up for 12 months post-transplant. One ml of EDTA peripheral venous blood was collected pre- transplant, 1 month, 3 months, 6 months, 12 months post-transplant and at the time of graft rejection. A multicolour flowcytometry was performed to monitor the percentage of peripheral Plasma cells (CD20-CD38+CD138+), Total B-cells (CD20+), Naive B-cells (CD20+CD27-CD38-), Activated B-cells (CD20+CD38+CD138-) and Memory B-cells (CD20+CD138-CD27+). Results Of 211 cases of first kidney allograft recipients, 35 (16.58%) recipients had 38 episodes of acute allograft rejection. Percentage of activated B cells and Memory B-cells were found to be significantly higher in uremic patients ( n = 78) than those of healthy persons ( n = 40) (20.81 ± 0.7616 % vs. 14.37 ± 0.5972%, p p = 0.0025 respectively). On the contrary, the percentage of naive B- cells was found to be significantly lower in the patients than normal controls (61.04 ± 1.691% vs 73.62 ± 1.320%, p n = 38) were associated with increase in peripheral percentage of total B-cells (19.02 ± 1.457 vs. 10.80 ± 0.6338, P P P P P = 0.0311 respectively). Conclusion The percentage of activated B-cells and Memory B-cells were persistently high in uremic patients suggesting that these patients are always in a stage of immune activation. Acute rejection episodes were associated with increased percentage of activated B-cells but decrease in the percentage of plasma- and memory-B cells in the peripheral blood. Therefore, post- transplantation, periodic measurements of B-cell subsets may serve as an important marker in the prediction of acute allograft rejection.", "keywords": "", "authors": [ { "name": "Ravi Dhital", "org": "Post Graduate Institution of Medical Education and Research, Transplant Surgery, Chandigarh, India" }, { "name": "Mukut Minz", "org": "Post Graduate Institution of Medical Education and Research, Transplant Surgery, Chandigarh, India" }, { "name": "Ranjana W. Minz", "org": "Post Graduate Institution of Medical Education and Research, Immunopathology, Chandigarh, India" }, { "name": "Ashish Sharma", "org": "Post Graduate Institution of Medical Education and Research, Transplant Surgery, Chandigarh, India" }, { "name": "Ritambhara Nada", "org": "Post Graduate Institution of Medical Education and Research, Histopathology, Chandigarh, India" }, { "name": "Sarbpreet Singh", "org": "Post Graduate Institution of Medical Education and Research, Transplant Surgery, Chandigarh, India" }, { "name": "Deepesh B. Kenwar", "org": "Post Graduate Institution of Medical Education and Research, Transplant Surgery, Chandigarh, India" } ], "venue": "Human Immunology", "year": 2016 }, "owCLNaQ1": { "id": "owCLNaQ1", "title": "Deceased donor renal transplantation: A single tertiary care center experience", "abstract": "", "keywords": "", "authors": [ { "name": "Kunal Kapoor", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Deepesh B. Kenwar", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Navdeep Singh", "org": "" } ], "venue": "Transplantation", "year": 2018 }, "eL892Xxf": { "id": "eL892Xxf", "title": "Successful renal transplantation in a family with a novel mutation in COL4A3 gene and Autosomal Recessive Alport syndrome.", "abstract": "Alport syndrome (AS) is an inherited disorder of basement membranes caused by mutations affecting specific proteins of the type IV collagen family, presenting with nephropathy and extrarenal manifestations such as sensorineural deafness and ocular anomalies. Ten to fifteen percent of the patients with AS have autosomal recessive (ARAS) due to mutation in either COL4A3 or COL4A4 gene. We report a novel mutation in the COL4A3 gene in an Indian family with ARAS. The above-mentioned genetic anomaly was a missense variation in exon 26 of the COL4A3 gene (chr2:228137797G>A; c.1891G>A) that resulted in the amino acid substitution of Arginine for Glycine at codon 631 (p.Gly631Arg) that was present in the heterozygous state in the asymptomatic parents and homozygous state in the male offspring who presented with early-onset end-stage renal disease, lenticonus and hearing loss. The patient (male offspring) underwent successful renal transplantation with his mother as a donor. This article is protected by copyright. All rights reserved.", "keywords": [ "Alport syndrome", "autosomal recessive", "end-stage renal disease", "missense mutation", "renal-transplantation" ], "authors": [ { "name": "Niveditha Girimaji", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "S M Sakthivel Murugan", "org": "MedGenome Labs Ltd., Bangalore, India." }, { "name": "Ritambhra Nada", "org": "Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Ashish Sharma", "org": "Department of Renal Transplant Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Manish Rathi", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Harbir Singh Kohli", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "K L Gupta", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." }, { "name": "Raja Ramachandran", "org": "Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India." } ], "venue": "Nephrology (Carlton, Vic.)", "year": 2020 }, "Vdpg7xnT": { "id": "Vdpg7xnT", "title": "In vitro lymphocyte culture-based allo-specific cytokine response profiles predictive of acute rejection in kidney allografts", "abstract": "", "keywords": "", "authors": [ { "name": "Biman Saikia", "org": "" }, { "name": "Sobhana Mahakur", "org": "" }, { "name": "Mukut Minz", "org": "" }, { "name": "RanjanaWalker Minz", "org": "" }, { "name": "Ritambhra Nada", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Mehak Bhasin", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2020 }, "uWJoM8wU": { "id": "uWJoM8wU", "title": "Flow cytometric quantitation of T-cell subsets in peripheral blood of renal allograft recipients", "abstract": "", "keywords": "", "authors": [ { "name": "Ravi Dhital", "org": "" }, { "name": "Mukut Minz", "org": "" }, { "name": "Ranjana W. Minz", "org": "" }, { "name": "Ritambhara Nada", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Deepesh Kenwer", "org": "" }, { "name": "Sandhya Toki", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "i7yzEigP": { "id": "i7yzEigP", "title": "Experience with Cadaveric Arterial Conduits as Hemodialysis Access", "abstract": "", "keywords": "", "authors": [ { "name": "Deepesh B. Kenwar", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Sarbpreet Singh", "org": "" }, { "name": "Navdeep Singh", "org": "" }, { "name": "Kunal Kapoor", "org": "" } ], "venue": "Transplantation", "year": 2018 }, "QDeXQ0G3": { "id": "QDeXQ0G3", "title": "Brain abscess in a kidney transplant recipient due to an unusual fungal infection: A case report and review", "abstract": "", "keywords": "", "authors": [ { "name": "KrishanLal Gupta", "org": "" }, { "name": "Sahil Bagai", "org": "" }, { "name": "Rajesh Chhabra", "org": "" }, { "name": "Arunaloke Chakrabarti", "org": "" }, { "name": "Raja Ramachandran", "org": "" }, { "name": "Vivek Kumar", "org": "" }, { "name": "Manish Rathi", "org": "" }, { "name": "HarbirSingh Kohli", "org": "" }, { "name": "Ashish Sharma", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2019 }, "RolYLa2g": { "id": "RolYLa2g", "title": "Correlation of Pretransplant Glucose Metabolism With the development of New Onset Diabetes After Renal Transplantation", "abstract": "", "keywords": "", "authors": [ { "name": "Sahil Bagai", "org": "" }, { "name": "Namrata Rao", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Naresh Sachdeva", "org": "" }, { "name": "Manish Rathi", "org": "" } ], "venue": "Transplantation", "year": 2017 }, "PxsYpcRy": { "id": "PxsYpcRy", "title": "A single centre experience of deceased donor transplantation", "abstract": "", "keywords": "", "authors": [ { "name": "Kunal Kapoor", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Deepesh B. Kenwar", "org": "" }, { "name": "Sarabpreet", "org": "" }, { "name": "Sunil Kumar", "org": "" } ], "venue": "Indian Journal of Transplantation", "year": 2016 }, "TrVKvVgK": { "id": "TrVKvVgK", "title": "Varicella gangrenosum in adult: a fatal chickenpox complication.", "abstract": "Varicella gangrenosum is a gangrenous ulceration of varicella lesions involving the skin and soft tissues of the body. The term was coined more than 100 years ago. This occurs due to superimposed bacterial infection. The presentation of primary varicella in adults is more severe with catastrophic systemic complications as compared with children. These complications include necrotising fasciitis, disseminated intravascular coagulation, wet/dry gangrene and death, as was seen in our case. Survival is dependent on early diagnosis and treatment. Adequate antibiotic treatment and particularly early radical surgical debridement should be the cornerstone of management. Less than 10 such cases are reported in the literature.", "keywords": [ "general surgery", "plastic and reconstructive surgery", "urological surgery", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Samarth Agarwal", "org": "Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." }, { "name": "Anamika Sharma", "org": "Intensive Care, All India Institute of Medical Sciences, New Delhi, Delhi, India." }, { "name": "Manoj Kumar", "org": "Urology, King George's Medical University, Lucknow, Uttar-Pradesh, India." } ], "venue": "BMJ case reports", "year": 2019 }, "46cylWLW": { "id": "46cylWLW", "title": "Spectrum of management options for paediatric pelvic fracture urethral injury and outcome analysis: 12 year tertiary centre experience", "abstract": "Most pediatric posterior urethral strictures post-PFUI (≤2 cm) can be managed by delayed TPAR with reasonable success rates. Few selected patients may require procedures such as TPU based on local stricture characteristics.", "keywords": [ "PFUI", "Paediatric", "Pelvic fracture-associated urethral injury", "Urethra", "Urethroplasty" ], "authors": [ { "name": "Gaurav Garg", "org": "" }, { "name": "Manoj Kumar", "org": "" }, { "name": "Manmeet Singh", "org": "" }, { "name": "Siddharth Pandey", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "S.N. Sankhwar", "org": "" } ], "venue": "Journal of Pediatric Urology", "year": 2019 }, "koTaa92L": { "id": "koTaa92L", "title": "Non-traumatic ruptured splenic abscess presenting with pneumoperitoneum in an immunocompetent patient: a diagnostic dilemma.", "abstract": "Splenic abscess is a rare life-threatening clinical entity. There are only a handful of reported cases of spontaneous splenic abscess rupture with pneumoperitoneum. Rupture of splenic abscess associated with gas-producing pathogens may lead to pneumoperitoneum. We hereby report the case of a ruptured splenic abscess with pneumoperitoneum in a young immunocompetent woman masquerading as hollow viscus perforation peritonitis. Ruptured splenic abscess should be kept in mind for treating surgeons as a differential diagnosis of pneumoperitoneum or peritonitis, particularly for immunocompromised patients.", "keywords": [ "gas/free gas", "gastroenterology", "gastrointestinal surgery", "general surgery" ], "authors": [ { "name": "Nitin Agarwal", "org": "Department of Surgery and Renal Transplant, Postgraduate Institute of Medical Education and Research (PGIMER) Dr. Ram Manohar Lohia Hospital, Delhi, India." }, { "name": "Ashish Sharma", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Gaurav Garg", "org": "Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2019 }, "sgBIAg53": { "id": "sgBIAg53", "title": "Transvaginal Repair of Vesico Vaginal Fistula: A 10-Year Experience with Analysis of Factors Affecting Outcomes.", "abstract": "The transvaginal approach is less invasive and achieves comparable success rates as compared to other methods of vesico-vaginal fistula repair. This surgery with Foley catheter has a high success rate with reduced morbidity. We postulate that vaginal approach should be preferred over abdominal approach for repair of all vaginally accessible vesico vaginal fistulae, both of obstetrical and gynaecological origin.", "keywords": [ "Outcomes", "Transvaginal repair", "Vesicovaginal fistula" ], "authors": [ { "name": "Manoj Kumar", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Samarth Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, India, rebellite@gmail.com." }, { "name": "Apul Goel", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Ajay Agarwal", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, India." }, { "name": "Satya Narain Sankhwar", "org": "Department of Urology, King George's Medical University, Lucknow, India." } ], "venue": "Urologia internationalis", "year": 2019 }, "fIIwJg9b": { "id": "fIIwJg9b", "title": "Missed ureteral injury in a young man with stab injury.", "abstract": "", "keywords": [ "radiology", "urology" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Siddharth Pandey", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Ajay Aggarwal", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." }, { "name": "Manoj Kumar", "org": "Department of Urology, King George's Medical University, Lucknow, Uttar Pradesh, India." } ], "venue": "BMJ case reports", "year": 2018 }, "60qvgUgn": { "id": "60qvgUgn", "title": "Chyluria in pregnancy: Etiology, diagnosis, and management perspective", "abstract": "", "keywords": "", "authors": [ { "name": "Gaurav Garg", "org": "" }, { "name": "Bimalesh Purkait", "org": "" }, { "name": "Manmeet Singh", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Siddharth Pandey", "org": "" }, { "name": "SatyaNarayan Sankhwar", "org": "" } ], "venue": "Saudi Journal of Kidney Diseases and Transplantation", "year": 2019 }, "B83E8SXC": { "id": "B83E8SXC", "title": "Analysis of Risk Factors and Clinicopathological Characteristics of Young Colorectal Cancers in an Underprivileged Population", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Nabeel U. Moon", "org": "" }, { "name": "Johanna Chan", "org": "" }, { "name": "Hoda M. Malaty", "org": "" }, { "name": "Milena Gould Suarez", "org": "" } ], "venue": "Gastroenterology", "year": 2017 }, "WfbzyKpX": { "id": "WfbzyKpX", "title": "Prevalence of metabolic syndrome in older (50 years and older) vs younger (less than 50 years) patients with colorectal cancer diagnosed in a safety net hospital system.", "abstract": "512 Background: Colorectal cancer (CRC) incidence has declined overall with screening, though incidence in patients younger than 50 years has increased. Younger patients present with more aggressive and advanced stage CRC. Potential mechanisms are sporadic, genetics, and environmental (alcohol, smoking, metabolic syndrome). Metabolic syndrome (MetS) is an established risk factor for CRC. We examined the prevalence of MetS in younger patients ( 102 cm in men, u003e 88 cm in women), serum triglyc...", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Johanna Chan", "org": "" }, { "name": "Tony Trang", "org": "" }, { "name": "Milena Gould Suarez", "org": "" } ], "venue": "Journal of Clinical Oncology", "year": 2016 }, "o82RnNqS": { "id": "o82RnNqS", "title": "Obesity May Place Young Minorities at Higher Risk for Presentation with Late Stage Colorectal Cancer", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Jordan Sparkman", "org": "" }, { "name": "Johanna Chan", "org": "" }, { "name": "Hoda M. Malaty", "org": "" }, { "name": "Milena Gould Suarez", "org": "" } ], "venue": "Gastroenterology", "year": 2017 }, "XnepBjPZ": { "id": "XnepBjPZ", "title": "Outcomes of Universal Testing for Lynch Syndrome for Colon Cancer in a County Health System: 148", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Baylor Coll Med, Houston, TX 77030 USA" }, { "name": "Derek Lin", "org": "Baylor Coll Med, Houston, TX 77030 USA" }, { "name": "Nabeel Moon", "org": "Baylor Coll Med, Houston, TX 77030 USA" }, { "name": "Milena Gould Suarez", "org": "Ben Taub Gen Hosp, Baylor Coll Med, Houston, TX 77030 USA" } ], "venue": "AMERICAN JOURNAL OF GASTROENTEROLOGY", "year": 2017 }, "h8FmncIL": { "id": "h8FmncIL", "title": "Aggressive and Advanced Non-Cardia Gastric Cancer in Young Hispanic Immigrants to the United States", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Rollin George", "org": "" }, { "name": "David Y. Graham", "org": "" }, { "name": "Hoda M. Malaty", "org": "" }, { "name": "Maya Balakrishnan", "org": "" } ], "venue": "Gastroenterology", "year": 2017 }, "wRUuXkEC": { "id": "wRUuXkEC", "title": "Rate of implementation of universal testing for Lynch Syndrome in a county hospital system.", "abstract": "533 Background: Lynch Syndrome (LS) is the most common cause of inherited colorectal cancer (CRC). Universal testing is recommended as a cost effective strategy for screening for LS in all patients with CRC diagnosed u003c 70 years of age. This has shown to be beneficial in clinical decision making and cancer surveillance of both the patient and at risk relatives. According to a study in 2012, 71% of NCI institutions were performing universal testing versus 15%-36% of programs in the community. The aim of our study was to determine the outcomes of Universal Testing for LS in CRC in a County Hospital System. Methods: IRB-approved retrospective chart review of all patients diagnosed with colorectal cancer from cancer registry at Harris County Hospital District from March 2010 to Dec 2013. Patients between 18-70 yr were included. We collected data on patient characteristics, universal testing [immunohistochemistry (IHC) at our institution], and LS diagnosis (confirmed with germline testing for mismatch repair ge...", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Johanna Chan", "org": "" }, { "name": "Tony Trang", "org": "" }, { "name": "Milena Gould Suarez", "org": "" } ], "venue": "Journal of Clinical Oncology", "year": 2016 }, "blwwUozm": { "id": "blwwUozm", "title": "EUS as an Adjunct to ERCP for the Diagnosis of Malignant Pancreaticobiliary Duct Stricture", "abstract": "", "keywords": [], "authors": [ { "name": "Pankaj Singh", "org": "" }, { "name": "Stacie Vela", "org": "" }, { "name": "Deepak Agrawal", "org": "" }, { "name": "Gregory Olds", "org": "" }, { "name": "Vikram Boolchand", "org": "" }, { "name": "Gerard Isenberg", "org": "" }, { "name": "Richard C.K. Wong", "org": "" }, { "name": "Michael V. Sivak", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Ahmed Khan", "org": "" }, { "name": "Stavan P. Parmar", "org": "" }, { "name": "Amitabh Chak", "org": "" } ], "venue": "Gastrointestinal Endoscopy", "year": 2004 }, "Dqi2Oc9C": { "id": "Dqi2Oc9C", "title": "Long Term Outcome in Patients with Endosonographic Findings Suggestive of Mild Chronic Pancreatitis", "abstract": "", "keywords": [], "authors": [ { "name": "Pankaj Singh", "org": "" }, { "name": "Stacie Vela", "org": "" }, { "name": "Deepak Agrawal", "org": "" }, { "name": "Gregory Olds", "org": "" }, { "name": "Vikram Boolchand", "org": "" }, { "name": "Ananya Das", "org": "" }, { "name": "Gerard Isenberg", "org": "" }, { "name": "Richard C.K. Wong", "org": "" }, { "name": "Michael V. Sivak", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Ahmed Khan", "org": "" }, { "name": "Amitabh Chak", "org": "" } ], "venue": "Gastrointestinal Endoscopy", "year": 2004 }, "6nHzzr1G": { "id": "6nHzzr1G", "title": "Endoscopic ultrasound as a first test for diagnosis and staging of lung cancer: a prospective study.", "abstract": "Rationale: Multiple tests are required for the management of lung cancer. Objectives: Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) was evaluated as a single test for the diagnosis and staging (thoracic and extrathoracic) of lung cancer. Methods: Consecutive subjects with computed tomography (CT) findings of a lung mass were enrolled for EUS and results were compared with those from CT and positron emission tomography scans. Results: Of 113 subjects with lung cancer, EUS was performed as a first test (after CT scan) for diagnosis in 93 (82%) of them. EUS-FNA established tissue diagnosis in 70% of cases. EUS-FNA, CT, and positron emission tomography detected metastases to the mediastinal lymph nodes with accuracies of 93, 81, and 83%, respectively. EUS-FNA was significantly better than CT at detecting distant metastases (accuracies of 97 and 89%, respectively; p = 0.02). Metastases to lymph nodes at the celiac axis (CLNs) were observed in 11% of cases. The diagnostic yields of EUS-FNA and CT for detection of metastases to the CLNs were 100 and 50%, respectively (p < 0.05). EUS was able to detect small metastases (less than 1 cm) often missed by CT. Metastasis to the CLNs was a predictor of poor survival of subjects with non-small cell lung cancer, irrespective of the size of the CLNs. Of 44 cases with resectable tumor on CT scan, EUS-FNA avoided thoracotomy in 14% of cases. Conclusions: EUS-FNA as a first test (after CT) has high diagnostic yield and accuracy for detecting lung cancer metastases to the mediastinum and distant sites. Metastasis to the CLNs is associated with poor prognosis. EUS-FNA is able to detect occult metastasis to the CLNs and thus avoids thoracotomy.", "keywords": [ "lung cancer", "non-small cell lung cancer", "celiac lymph nodes", "endoscopic ultrasound-guided fine needle aspiration", "survival" ], "authors": [ { "name": "Pankaj Singh", "org": "" }, { "name": "Brian Camazine", "org": "" }, { "name": "Yashodeep Jadhav", "org": "Department of Radiology|Central Texas Veterans Health Care System" }, { "name": "Rahul Gupta", "org": "Department of Radiology|Central Texas Veterans Health Care System" }, { "name": "Phalguni Mukhopadhyay", "org": "Division of Oncology|Central Texas Veterans Health Care System" }, { "name": "Ahmed Khan", "org": "" }, { "name": "Rama Reddy", "org": "" }, { "name": "Qi Zheng", "org": "" }, { "name": "David D. Smith", "org": "Department of Biostatistics|City of Hope National Medical Center" }, { "name": "Renu Khode", "org": "Division of Gastroenterology|Central Texas Veterans Health Care System" }, { "name": "Bankim Bhatt", "org": "" }, { "name": "Sanjay Bhat", "org": "Department of Radiology|Central Texas Veterans Health Care System" }, { "name": "Yasir Yaqub", "org": "Division of Gastroenterology|Central Texas Veterans Health Care System" }, { "name": "Rajnikant S. Shah", "org": "" }, { "name": "Ashish Sharma", "org": "Division of Gastroenterology|VA Boston , Healthcare System" }, { "name": "Pawan Sikka", "org": "" }, { "name": "Richard A. Erickson", "org": "" }, { "name": "Temple Texas", "org": "" } ], "venue": "AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE", "year": 2007 }, "ABhoQXyQ": { "id": "ABhoQXyQ", "title": "Do Stents Reduce the Diagnostic Yield of EUS-FNA in Malignant Strictures?", "abstract": "", "keywords": [], "authors": [ { "name": "Gregory Olds", "org": "" }, { "name": "Pankaj Singh", "org": "" }, { "name": "Stacie Vela", "org": "" }, { "name": "Deepak Agrawal", "org": "" }, { "name": "Boolchand Vikram", "org": "" }, { "name": "Ananya Das", "org": "" }, { "name": "Gerard Isenberg", "org": "" }, { "name": "Richard C.K. Wong", "org": "" }, { "name": "Michael V. Sivak", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Ahmed Khan", "org": "" }, { "name": "Amitabh Chak", "org": "" } ], "venue": "Gastrointestinal Endoscopy", "year": 2004 }, "inr2JwiL": { "id": "inr2JwiL", "title": "Acute pancreatitis after EUS-guided FNA of solid pancreatic masses: a pooled analysis from EUS centers in the United States", "abstract": "The aim of this study was to determine the frequency and the severity of pancreatitis after EUS-guided FNA of solid pancreatic masses. A survey of centers that offer training in EUS in the United States was conducted.A list of centers in which training in EUS is offered was obtained from the Web site of the American Society for Gastrointestinal Endoscopy. Designated program directors were contacted via e-mail. The information requested included the number of EUS-guided FNA procedures performed for solid pancreatic masses, the number of cases of post-procedure pancreatitis, and the method for tracking complications. For each episode of pancreatitis, technical details were obtained about the procedure, including the location of the mass, the type of fine needle used, the number of needle passes, and the nature of the lesion.Nineteen of the 27 programs contacted returned the questionnaire (70%). In total, 4909 EUS-guided FNAs of solid pancreatic masses were performed in these 19 centers over a mean of 4 years (range 11 months to 9 years). Pancreatitis occurred after 14 (0.29%): 95% CI[0.16, 0.48] procedures. At two centers in which data on complications were prospectively collected, the frequency of acute pancreatitis was 0.64%, suggesting that the frequency of pancreatitis in the retrospective cohort (0.26%) was under-reported (p=0.22). The odds that cases of pancreatitis would be reported were 2.45 greater for the prospective compared with the retrospective cohort (95% CI[0.55, 10.98]). The median duration of hospitalization for treatment of pancreatitis was 3 days (range 1-21 days). The pancreatitis was classified as mild in 10 cases, moderate in 3, and severe in one; one death (proximate cause, pulmonary embolism) occurred after the development of pancreatitis in a patient with multiple comorbid conditions.EUS-guided FNA of solid pancreatic masses is infrequently associated with acute pancreatitis. The procedure appears to be safe when performed by experienced endosonographers. The frequency of post EUS-guided FNA pancreatitis may be underestimated by retrospective analysis.", "keywords": [], "authors": [ { "name": "Mohamad A. Eloubeidi", "org": "Endoscopic Ultrasound Program, University of Alabama, 1530 3rd Avenue South, ZRB 636, Birmingham, AL 35294-0007, USA." }, { "name": "Frank G. Gress", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Thomas J. Savides", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Maurits J. Wiersema", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Michael L. Kochman", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Nuzhat A. Ahmad", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Gregory G. Ginsberg", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Richard A. Erickson", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "John DeWitt", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Jacques Van Dam", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Nicholas J. Nickl", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Michael J. Levy", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Jonathan E. Clain", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Amitabh Chak", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Michael V. Sivak", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Richard Wong", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Gerard Isenberg", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "James M. Scheiman", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Brenna Bounds", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Michael B. Kimmey", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Michael D. Saunders", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Kenneth J. Chang", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Ashish Sharma", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Phoniex Nguyen", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "John G. Lee", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Steven A. Edmundowicz", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Dayna Early", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Riad Azar", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Babak Etemad", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Yang K. Chen", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Irving Waxman", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Vanessa Shami", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "Mark F. Catalano", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" }, { "name": "C. Mel Wilcox", "org": "Current affiliations: University of Alabama, Birmingham, Alabama, SUNY at Stony Brook, New York, University of California, San Diego, California, Mayo Clinic, Rochester, Minnesota, University Of Pennsylvania, Philadelphia, Pennsylvania, Scott and White Clinic, Temple, Texas, Indiana University Medical Center, Indianapolis, Indiana, Stanford University Medical Center, Stanford, California, University of Kentucky, Louisville, Kentucky, University Hospital of Cleveland, Ohio, University of Michigan, Ann Arbor, Michigan, Massachusetts General Hospital, Boston, Massachusetts, University of Washington School of Medicine, Seattle, Washington, University of California, Irvine, Orange, California, Washington University, Barnes-Jewish Hospital, St. Louis, Missouri, University of Pittsburgh, Pennsylvania, University of Colorado, Denver, Colorado, University of Chicago, Illinois, GI Consultants, Milwaukee, WisconsinUSA" } ], "venue": "Gastrointestinal Endoscopy", "year": 2004 }, "jS3lDEHi": { "id": "jS3lDEHi", "title": "Comparison of Accuracy of the Positron Emission Tomography, Computed Tomography, and Endoscopic Ultrasonography for Detection of the Metastases at Celiac Axis Lymph Nodes in Lung Carcinoma: A Prospective Study", "abstract": "", "keywords": [ "computed tomography" ], "authors": [ { "name": "Pankaj Singh", "org": "" }, { "name": "Rahul Gupta", "org": "" }, { "name": "Yashodeep Jadhav", "org": "" }, { "name": "Rama M. Reddy", "org": "" }, { "name": "Phalguni Mukhopadhyay", "org": "" }, { "name": "Rajnikanth S. Shah", "org": "" }, { "name": "Chetan Jinadatha", "org": "" }, { "name": "John C. Lasiter", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Richard A. Erickson", "org": "" } ], "venue": "Gastrointestinal Endoscopy", "year": 2005 }, "CRURgF67": { "id": "CRURgF67", "title": "Axially asymmetric rotating tank experiments for thermally forced stationary waves in geophysical fluids", "abstract": "", "keywords": "", "authors": [ { "name": "Huei Ping Huang", "org": "" }, { "name": "Julian Hunt", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Louis Tse", "org": "" }, { "name": "H. J. S. Fernando", "org": "" }, { "name": "Andrey Gunawan", "org": "" }, { "name": "Patrick E. Phelan", "org": "" }, { "name": "Arthur Madrid", "org": "" }, { "name": "Michael Thompson", "org": "" } ], "venue": "Bulletin of the American Physical Society", "year": 2011 }, "4446FO3y": { "id": "4446FO3y", "title": "Numerical Modeling of Flow in the Condensate Polisher Vessel of a Nuclear Reactor, with Applications to PVNGS", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Jeffrey Brown", "org": "" }, { "name": "H. J. S. Fernando", "org": "" } ], "venue": "Nuclear Technology", "year": 2011 }, "w56YjQ9Y": { "id": "w56YjQ9Y", "title": "Urban meteorological modeling using WRF: A sensitivity study", "abstract": "This study explores the sensitivity of high-resolution mesoscale simulations of urban heat island (UHI) in the Chicago metropolitan area (CMA) and its environs to urban physical parameterizations, with emphasis on the role of lake breeze. A series of climate downscaling experiments were conducted using the urban-Weather Research and Forecasting (uWRF) model at 1-km horizontal resolution for a relatively warm period with a strong lake breeze. The study employed best available morphological data sets, selection of appropriate urban parameters, and estimates of anthropogenic heating sources for the CMA. Several urban parameterization schemes were then evaluated using these parameter values. The study also examined (1) the impacts of land data assimilation for initialization of the mesoscale model, (2) the role of urbanization on UHI and lake breeze, and (3) the effects of sub-grid scale land-cover variability on urban meteorological predictions. Comparisons of temperature and wind simulations with station observations and Moderate Resolution Imaging Spectroradiometer satellite data in the CMA showed that uWRF, with appropriate selection of urban parameter values, was able to reproduce the measured near-surface temperature and wind speeds reasonably well. In particular, the model was able to capture the observed spatial variation of 2-m near-surface temperatures at night, when the UHI effect was pronounced. Results showed that inclusion of sub-grid scale variability of land-use and initializing models with more accurate land surface data can yield improved simulations of near-surface temperatures and wind speeds, particularly in the context of simulating the extent and spatial heterogeneity of UHI effects.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "H. J. S. Fernando", "org": "Department of Civil & Environmental Engineering and Earth Sciences (CEEES) University of Notre Dame IN USA" }, { "name": "Alan F. Hamlet", "org": "" }, { "name": "Jessica J. Hellmann", "org": "Department of Biological Sciences University of Notre Dame IN USA" }, { "name": "Jessica J. Hellmann", "org": "Department of Biological Sciences University of Notre Dame IN USA" }, { "name": "Michael Barlage", "org": "Research Applications Laboratory National Center for Atmospheric Research Boulder CO USA" }, { "name": "Fei Chen", "org": "Research Applications Laboratory National Center for Atmospheric Research Boulder CO USA" } ], "venue": "International Journal of Climatology", "year": 2017 }, "4HkeQzNO": { "id": "4HkeQzNO", "title": "Green and cool roofs to mitigate urban heat island effects in the Chicago metropolitan area: evaluation with a regional climate model", "abstract": "The effects of urban heat islands (UHIs) have a substantial bearing on the sustainability of cities and environs. This paper examines the efficacy of green and cool roofs as potential UHI mitigation strategies to make cities more resilient against UHI. We have employed the urbanized version of the Weather Research and Forecasting (uWRF) model at high (1 km) resolution with physically-based rooftop parameterization schemes (conventional, green and cool), a first-time application to the Chicago metropolitan area. We simulated a hot summer period (16–18 August 2013) and assessed (i) UHI reductions for different urban landuse with green/cool roofs, (ii) the interaction of lake breeze and UHI, and (iii) diurnal boundary layer dynamics. The performance of uWRF was evaluated using sensible heat flux and air temperature measurements from an urban mini-field campaign. The simulated roof surface energy balance captured the energy distribution with respective rooftop algorithms. Results showed that daytime roof temperature reduced and varied linearly with increasing green roof fractions, from less than 1 °C for the case of 25% green roof to ~3 °C during peak daytime for 100% green roof. Diurnal transitions from land to lake breeze and vice versa had a substantial impact on the daytime cycle of roof surface UHI, which had a 3–4 hour lag in comparison to 2 m UHI. Green and cool roofs reduced horizontal and vertical wind speeds and affected lower atmosphere dynamics, including reduced vertical mixing, lower boundary layer depth, and weaker convective rolls. The lowered wind speeds and vertical mixing during daytime led to stagnation of air near the surface, potentially causing air quality issues. The selection of green and cool roofs for UHI mitigation should therefore carefully consider the competing feedbacks. The new results for regional land-lake circulations and boundary layer dynamics from this study may be extended to other urbanized areas, particularly to coastal areas.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "P Conry", "org": "Department of Civil & Environmental Engineering and Earth Sciences (CEEES), University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA" }, { "name": "H. J. S. Fernando", "org": "Department of Civil & Environmental Engineering and Earth Sciences (CEEES), University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA" }, { "name": "Alan F. Hamlet", "org": "" }, { "name": "Jessica J. Hellmann", "org": "Department of Biological Sciences, University of Notre Dame, 100 Galvin Life Science Center, Notre Dame, IN 46556, USA" }, { "name": "Fei Chen", "org": "Research Application Laboratory, National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301 USA" } ], "venue": "Environmental Research Letters", "year": 2016 }, "vQXnC0g4": { "id": "vQXnC0g4", "title": "Simulating the thermal behavior in Lake Ontario using EFDC", "abstract": "Abstract The thermal behavior of Lake Ontario (spring warming, thermal bar formation, and summer stratification) is simulated using the three-dimensional thermo-hydrodynamic model, Environmental Fluid Dynamics Code (EFDC). The model is forced with hourly meteorological data from weather stations around the lake and flow data from Niagara and St. Lawrence Rivers. The simulation is performed from April to July 2011 on a curvilinear grid, with cells approximately 2 × 2 km 2 and bathymetry interpolated onto the grid. We implement model improvements by (a) updating the evaporation algorithm to ensure accurate simulation of evaporation rates and latent heat fluxes and (b) specifying appropriate solar radiation attenuation coefficients to ensure sufficient absorption of incoming solar radiation by the water column. The study also calibrated horizontal and vertical mixing coefficients. Results show that the model accurately simulated the overall surface temperature profiles with RMSEs between 1 and 2 °C and the vertical temperature profiles during the lake mixed phase with RMSEs", "keywords": "", "authors": [ { "name": "Rumana Reaz Arifin", "org": "University of Notre Dame, Department of Civil & Environmental Engineering and Earth Sciences (CEEES), 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA" }, { "name": "Scott C. James", "org": "" }, { "name": "Dilkushi A. de Alwis Pitts", "org": "Center for Research Computing (CRC), University of Notre Dame, P.O. Box 539, Notre Dame, IN 46556, USA" }, { "name": "Alan F. Hamlet", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "H. J. S. Fernando", "org": "University of Notre Dame, Department of Civil & Environmental Engineering and Earth Sciences (CEEES), 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA" } ], "venue": "Journal of Great Lakes Research", "year": 2016 }, "IMCz0PhG": { "id": "IMCz0PhG", "title": "Lessons from Inter-Comparison of Decadal Climate Simulations and Observations for the Midwest U.S. and Great Lakes Region", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Alan F. Hamlet", "org": "" }, { "name": "Harindra J.S. Fernando", "org": "" } ], "venue": "Atmosphere", "year": 2019 }, "pDy73BYV": { "id": "pDy73BYV", "title": "Species are the Building Blocks of Ecosystem Services and Environmental Sustainability", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "" }, { "name": "frank bouchard", "org": "" }, { "name": "sean ryan", "org": "" }, { "name": "derrick j parker", "org": "" }, { "name": "jessica j hellmann", "org": "" } ], "venue": "", "year": 2013 }, "26T6AmUA": { "id": "26T6AmUA", "title": "Multi-Scale Simulations of Climate-Change Influence on Chicago Heat Island", "abstract": "Over the past half century, burgeoning urban areas such as Chicago have experienced elevated anthropogenic-induced alteration of local climates within urbanized regions. As a result, urban heat island (UHI) effect in these areas has intensified. Global climate change can further modulate UHI's negative effects on human welfare and energy conservation. Various numerical models exist to understand, monitor, and predict UHI and its ramifications, but none can resolve all the relevant physical phenomena that span a wide range of scales. To this end, we have applied a comprehensive multi-scale approach to study UHI of Chicago. The coupling of global, mesoscale, and micro-scale models has allowed for dynamical downscaling from global to regional to city and finally to neighborhood scales. The output of the Community Climate System Model (CCSM5), a general circulation model (GCM), provides future climate scenario, and its coupling with Weather Research and Forecasting (WRF) model enables studies on mesoscale behavior at urban scales. The output from the WRF model at 0.333 km resolution is used to drive a micro-scale model, ENVI-met. Through this coupling the bane of obtaining reliable initial and boundary conditions for the micro-scale model from limited available observational records has been aptly remedied. It was found that the performance of ENVI-met improves when WRF output, rather than observational data, is supplied for initial conditions. The success of the downscaling procedure allowed reasonable application of micro-scale model to future climate scenario provided by CCSM5 and WRF models. The fine (2 m) resolution of ENVI-met enables the study of two key effects of UHI at micro-scale: decreased pedestrian comfort and increased building-scale energy consumption. ENVI-met model's explicit treatment of key processes that underpin urban microclimate makes it captivating for pedestrian comfort analysis. Building energy, however, is not modeled by ENVI-met so we have developed a simplified building energy model to estimate future cooling needs.", "keywords": [ "simulation", "climate change" ], "authors": [ { "name": "patrick conry", "org": "Univ Notre Dame, Environm Fluid Dynam Labs, Notre Dame, IN 46556 USA" }, { "name": "h j s fernando", "org": "Univ Notre Dame, Environm Fluid Dynam Labs, Notre Dame, IN 46556 USA" }, { "name": "laura s leo", "org": "Univ Notre Dame, Environm Fluid Dynam Labs, Notre Dame, IN 46556 USA" }, { "name": "ashish sharma", "org": "Univ Notre Dame, Environm Change Initiat, Notre Dame, IN 46556 USA" }, { "name": "mark j potosnak", "org": "Depaul Univ, Environm Sci Program, Chicago, IL 60604 USA" }, { "name": "jessica j hellmann", "org": "Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA" } ], "venue": "ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING - 2014, VOL 1D: SYMPOSIA", "year": 2014 }, "Ji1M8VZ1": { "id": "Ji1M8VZ1", "title": "Chicago’s Heat Island and Climate Change: Bridging the Scales via Dynamical Downscaling", "abstract": "", "keywords": [ "climate change", "heat islands" ], "authors": [ { "name": "patrick conry", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "mark j potosnak", "org": "" }, { "name": "laura s leo", "org": "" }, { "name": "edward bensman", "org": "" }, { "name": "jessica j hellmann", "org": "" }, { "name": "harindra j s fernando", "org": "" } ], "venue": "Journal of Applied Meteorology and Climatology", "year": 2015 }, "WqrE2GQ1": { "id": "WqrE2GQ1", "title": "Modeling and measuring neighborhood scale flow, turbulence, and temperature within Chicago heat island", "abstract": "", "keywords": [], "authors": [ { "name": "patrick conry", "org": "" }, { "name": "ashish sharma", "org": "" }, { "name": "laura leo", "org": "" }, { "name": "h j s fernando", "org": "" }, { "name": "mark j potosnak", "org": "" }, { "name": "jessica j hellmann", "org": "" } ], "venue": "", "year": 2013 }, "B7h77XNy": { "id": "B7h77XNy", "title": "Role of green roofs in reducing heat stress in vulnerable urban communities—a multidisciplinary approach", "abstract": "", "keywords": "", "authors": [ { "name": "A Sharma", "org": "Environmental Change Initiative (ECI), University of Notre Dame, Flanner Hall, Notre Dame, IN 46556, United States of America" }, { "name": "S Woodruff", "org": "Environmental Change Initiative (ECI), University of Notre Dame, Flanner Hall, Notre Dame, IN 46556, United States of America" }, { "name": "M Budhathoki", "org": "Environmental Change Initiative (ECI), University of Notre Dame, Flanner Hall, Notre Dame, IN 46556, United States of America" }, { "name": "A F Hamlet", "org": "Department of Civil & Environmental Engineering and Earth Sciences (CEEES), University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, United States of America" }, { "name": "F Chen", "org": "Research Application Laboratory (RAL), National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, United States of America" }, { "name": "H J S Fernando", "org": "Department of Civil & Environmental Engineering and Earth Sciences (CEEES), University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, United States of America" } ], "venue": "Environmental Research Letters", "year": 2018 }, "854xfvzl": { "id": "854xfvzl", "title": "Plasmas generated in bubbles immersed in liquids: direct current streamers versus microwave plasma", "abstract": "Two approaches to generate non-equilibrium atmospheric-pressure plasma in bubbles immersed in liquids are compared using high-fidelity 2D fluid simulations. In the first approach, corona/streamer like plasma is generated using high-voltage negative and positive pulses applied between two electrodes (pin-to-plane geometry) immersed in liquid. In the second, the plasma is generated using a remote microwave source (frequency 2.45 GHz). We find that the microwave approach requires less energy, while generating a denser, more chemically reactive and more uniform plasma within the bubble volume, as compared to the plasma generated using high-voltage pulsing.", "keywords": "", "authors": [ { "name": "Dmitry Levko", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Journal of Physics D", "year": 2016 }, "akuhRnKp": { "id": "akuhRnKp", "title": "Kinetics and dynamics of nanosecond streamer discharge in atmospheric-pressure gas bubble suspended in distilled water under saturated vapor pressure conditions", "abstract": "We perform computational studies of nanosecond streamer discharges generated in helium bubbles immersed in distilled water under atmospheric pressure conditions. The model takes into account the presence of water vapor in the gas bubble for an accurate description of the discharge kinetics. We find that the dynamic characteristics of the streamer discharge are different at low and high positive trigger voltages with the axial streamer evolution dominant for low voltages and a surface hugging mode favored for high voltages. We also find a substantial difference in initiation, transition and evolution stages of discharge for positive and negative trigger voltages with the volumetric distribution of species in the streamer channel much more uniform for negative trigger voltages on account of the presence of multiple streamers. We observe that the presence of water vapor does not affect the breakdown voltage even for oversaturated conditions but significantly influences the composition of dominant species in the trail of the streamer as well as the flux of the dominant species on the bubble surface.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX 78712, USA" }, { "name": "Dmitry Levko", "org": "Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX 78712, USA" }, { "name": "Laxminarayan L. Raja", "org": "Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX 78712, USA" }, { "name": "Min Suk Cha", "org": "King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center (CCRC) and Physical Science and Engineering Division (PSE), Thuwal 23955, Saudi Arabia" } ], "venue": "Journal of Physics D", "year": 2016 }, "csBIFCsf": { "id": "csBIFCsf", "title": "A Multiphase Computational Model for Non-Equilibrium Plasma Discharge in Gas Bubbles Immersed in Liquid", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Dmitry Levko", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Bulletin of the American Physical Society", "year": 2017 }, "TzBsolaA": { "id": "TzBsolaA", "title": "Microwave plasmas generated in bubbles immersed in liquids for hydrocarbons reforming", "abstract": "We present a computational modeling study of microwave plasma generated in cluster of atmospheric-pressure argon bubbles immersed in a liquid. We demonstrate that the use of microwaves allows the generation of a dense chemically active non-equilibrium plasma along the gas–liquid interface. Also, microwaves allow generation of overdense plasma in all the bubbles considered in the cluster which is possible because the collisional skin depth of the wave exceeds the bubble dimension. These features of microwave plasma generation in bubbles immersed in liquids are highly desirable for the large-scale liquid hydrocarbon reforming technologies.", "keywords": "", "authors": [ { "name": "Dmitry Levko", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Journal of Physics D", "year": 2016 }, "smfaCzLz": { "id": "smfaCzLz", "title": "Computational investigations of streamers in a single bubble suspended in distilled water under atmospheric pressure conditions", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Dmitry Levko", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Bulletin of the American Physical Society", "year": 2016 }, "JTWHcYLv": { "id": "JTWHcYLv", "title": "Kinetic modeling of streamer penetration into de-ionized water", "abstract": "Interest in plasma-liquid interaction phenomena has grown in recent years due to applications in plasma medicine, water purification, and plasma-hydrocarbon reforming. The plasma in contact with liquid is generated, for example, using the plasma jets or streamer discharges. The interaction between the streamer and water can cause both physical and chemical modifications of the liquid. In this paper, the interaction between an anode-directed streamer and the de-ionized water is studied using one-dimensional particle-in-cell Monte Carlo collisions model. In this model, plasma species in both gas and liquid phase are considered as the macro-particles. We find that the penetration of the streamer head into the liquid causes ionization of water molecules by electron impact, a process which is usually ignored in the fluid models. The main charge carriers in the liquid phase are negative water ions which agree with earlier experimental and computational modeling studies. Additionally, we observe an ion-rich shea...", "keywords": "", "authors": [ { "name": "Dmitry Levko", "org": "Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, USA" }, { "name": "Ashish Sharma", "org": "Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, USA" }, { "name": "Laxminarayan L. Raja", "org": "Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, USA" } ], "venue": "Physics of Plasmas", "year": 2018 }, "e2A9ZjBG": { "id": "e2A9ZjBG", "title": "Numerical Investigations of Positive Surface Streamer Discharges For High-Pressure Large Gap Arc Breakdown", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Bulletin of the American Physical Society", "year": 2014 }, "B6llfcad": { "id": "B6llfcad", "title": "Chemical Kinetics Reduction of High Pressure Non-Equilibrium Plasma Discharges in Complex Gases Using Principal Component Analysis", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Bulletin of the American Physical Society", "year": 2015 }, "aLGTnW4o": { "id": "aLGTnW4o", "title": "Non-thermal plasma ethanol reforming in bubbles immersed in liquids", "abstract": "Ethanol reforming in non-thermal plasma generated in atmospheric-pressure argon bubbles immersed in liquid ethanol/water solution is studied using a self-consistent multi-species fluid model. The influence of the dielectric constant of the liquid on the plasma dynamics and its effect on the generation of active species is analyzed. Several modes of discharge are obtained for large liquid dielectric constant. In these modes, we obtain either an axial streamer or a combination of two simultaneous streamers propagating along the bubble axis and near the liquid wall. The influence of these modes on the production of active species is also studied. The main reactions responsible for the generation of molecular hydrogen and light hydrocarbon species are analyzed. A possible mechanism of hydrogen generation in liquid phase is discussed.", "keywords": "", "authors": [ { "name": "Dmitry Levko", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Laxminarayan L. Raja", "org": "" } ], "venue": "Journal of Physics D", "year": 2017 }, "59nYpT7W": { "id": "59nYpT7W", "title": "Effect of R–(+)–methanandamide on intraocular pressure and aqueous humor dynamics in rabbits and on prostaglandin E2 production in cultured human ciliary muscle cells.", "abstract": "", "keywords": [], "authors": [ { "name": "guangda zhan", "org": "university of nebraska medical center" }, { "name": "ashish sharma", "org": "university of nebraska medical center" }, { "name": "rajkumar v patil", "org": "university of nebraska medical center" }, { "name": "shan fan", "org": "university of nebraska medical center" }, { "name": "catherine a opere", "org": "creighton university" }, { "name": "m a shara", "org": "creighton university" }, { "name": "carl b camras", "org": "university of nebraska medical center" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2004 }, "kMtOP91C": { "id": "kMtOP91C", "title": "Effects of Triamcinolone Acetonide on Human Trabecular Meshwork Cells in vitro", "abstract": "", "keywords": [], "authors": [ { "name": "b d kuppermann", "org": "university of california" }, { "name": "a jayaprakash patil", "org": "university of california" }, { "name": "ashish sharma", "org": "university of california" }, { "name": "m f estrago franco", "org": "university of california" }, { "name": "s mansoor", "org": "university of california" }, { "name": "vincent raymond", "org": "laval university" }, { "name": "m c kenney", "org": "university of california" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2008 }, "kcl5o4S5": { "id": "kcl5o4S5", "title": "Effect of Fluocinolone Acetonide on Retinal Pigment Epithelial (ARPE-19) and Neurosensory Retinal (R28) Cells in vitro", "abstract": "", "keywords": [], "authors": [ { "name": "ashish sharma", "org": "university of california irvine" }, { "name": "l e a marques", "org": "university of california irvine" }, { "name": "a l gramajo", "org": "university of california irvine" }, { "name": "a neekhra", "org": "university of california irvine" }, { "name": "m c kenney", "org": "university of california irvine" }, { "name": "g m seigel", "org": "university of california irvine" }, { "name": "b d kuppermann", "org": "university of california irvine" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2007 }, "zCStBLry": { "id": "zCStBLry", "title": "Effects of Benzo(e)pyrene on Reactive Oxygen/Nitrogen Species and Inflammatory Cytokines Induction in Human RPE Cells and Attenuation by Mitochondrial-involved Mechanism.", "abstract": "The cytotoxic effects of B(e)p include elevated ROS/RNS levels along with pro-inflammatory IL-6 and GM-CSF proteins. Blocking the Qi site of cytochrome c reductase (complex III) with Antimycin A led to partial reduction in B(e)p induced ROS production. Our findings suggest that inhibitors for multiple pathways would be necessary to protect the retinal cells from B(e)p induced toxicity.", "keywords": [ "Benzo(e)pyrene", "Cytokines", "Retinal Pigment Epithelium" ], "authors": [ { "name": "M Fernanda Estrago-Franco", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA; Clinica Dres Estrago, Corrientes, Argentina." }, { "name": "M Tarek Moustafa", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA; Ophthalmology Department, Minia University, Egypt." }, { "name": "Mohammad Riazi-Esfahani", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA; Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran." }, { "name": "Ashish U Sapkal", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA." }, { "name": "Rhina Piche-Lopez", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA." }, { "name": "A Jayaprakash Patil", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA; Royal Lancaster Infirmary, University Hospitals of Morecambe Bay NHS Trust, Lancaster, UK." }, { "name": "Ashish Sharma", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA; Lotus Eye Care Hospital, Coimbatore, Tamil Nadu, India." }, { "name": "Payam Falatoonzadeh", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA." }, { "name": "Marilyn Chwa", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA." }, { "name": "Georgia Luczy-Bachman", "org": "Department of Pediatrics, University of California, Irvine, CA, USA." }, { "name": "Baruch D Kuppermann", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA." }, { "name": "M Cristina Kenney", "org": "Department of Ophthalmology, Gavin Herbert Eye Institute, University of California, Irvine, CA, USA." } ], "venue": "Journal of ophthalmic & vision research", "year": 0 }, "7EftgnTU": { "id": "7EftgnTU", "title": "Effects of Benzo(e)Pyrene, a toxic component of cigarette smoke, on human retinal pigment epithelial cells in vitro.", "abstract": "To better understand the cellular and molecular basis for the epidemiologic association between cigarette smoke and age-related macular degeneration (AMD), the authors examined the effects of Benzo(e)Pyrene (B(e)P), a toxic element in cigarette smoke, on human retinal pigment epithelial cells (ARPE-19).ARPE-19 cells were cultured in Dulbecco modified Eagle medium containing 10% fetal bovine serum. Cells were treated for 24 hours with 1000 microM, 400 microM, 200 microM, and 100 microM B(e)P. Cell viability was determined by a trypan blue dye-exclusion assay. Activities of caspase-3/7, caspase-8, caspase-9, and caspase-12 were measured by a fluorescence image scanner, and DNA laddering was evaluated by electrophoresis on 3% agarose gel.The mean percentage of cell viabilities of ARPE-19 cells was decreased in a dose-dependent manner after exposure to B(e)P at the higher concentrations of 1000 microM (20.0 +/- 0.4; P < 0.001), 400 microM (35.6 +/- 6.4; P < 0.001), and 200 microM (58.7 +/- 2.3; P < 0.001) but not at 100 microM (95.9 +/- 0.7; P > 0.05) compared with the equivalent dimethyl sulfoxide (DMSO)-treated control cultures. There were significant increases in caspase-3/7, -8, -9, and -12 activities compared with the DMSO-treated controls (P < 0.001). DNA laddering revealed bands at 200-bp intervals.These results show that B(e)P is a toxicant to human retinal pigment epithelial cells in vitro. It causes cell death and induces apoptosis by the involvement of multiple caspase pathways.", "keywords": [ "caspases", "caspase 8", "apoptosis", "fluorescence", "caspase 3" ], "authors": [ { "name": "ashwini k sharma", "org": "university of california irvine" }, { "name": "a neekhra", "org": "visual sciences" }, { "name": "a l gramajo", "org": "university of california irvine" }, { "name": "j patil", "org": "university of california irvine" }, { "name": "m franco", "org": "university of california irvine" }, { "name": "marilyn chwa", "org": "university of california irvine" }, { "name": "b d kuppermann", "org": "university of california irvine" }, { "name": "m c kenney", "org": "university of california irvine" } ], "venue": "Investigative ophthalmology & visual science", "year": 2008 }, "t4GBlYLk": { "id": "t4GBlYLk", "title": "Effects of light on retinal pigment epithelial cells, neurosensory retinal cells and Müller cells treated with Brilliant Blue G", "abstract": "", "keywords": [ "surgery" ], "authors": [ { "name": "saffar mansoor", "org": "university of california" }, { "name": "ashish sharma", "org": "university of california" }, { "name": "javier caceresdelcarpio", "org": "university of california" }, { "name": "l c zacharias", "org": "university of california" }, { "name": "a jayaprakash patil", "org": "university hospitals of morecambe bay nhs foundation trust" }, { "name": "navin gupta", "org": "university of california" }, { "name": "g astrid limb", "org": "university hospitals of morecambe bay nhs foundation trust" }, { "name": "m cristina kenney", "org": "university of california" }, { "name": "b d kuppermann", "org": "university of california" } ], "venue": "Clinical and Experimental Ophthalmology", "year": 2015 }, "ia8ZJsWf": { "id": "ia8ZJsWf", "title": "Effects of Benzo(e)Pyrene on Rat Retinal Neurosensory Cells and Human Microvascular Endothelial Cells in vitro", "abstract": "", "keywords": [], "authors": [ { "name": "a jayaprakash patil", "org": "university of california irvine" }, { "name": "a l gramajo", "org": "university of california irvine" }, { "name": "a sharma", "org": "university of california irvine" }, { "name": "m f estrago franco", "org": "university of california irvine" }, { "name": "marilyn chwa", "org": "university of california irvine" }, { "name": "g m seigel", "org": "university at buffalo" }, { "name": "b d kuppermann", "org": "university of california irvine" }, { "name": "m c kenney", "org": "university of california irvine" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2008 }, "E80Yzh60": { "id": "E80Yzh60", "title": "Differential Toxicity of Ultraviolet Light on Human Retinal Pigment Epithelial, Rat Retinal Neurosensory and Human Lens Epithelial Cells in vitro", "abstract": "", "keywords": [], "authors": [ { "name": "saffar mansoor", "org": "university of california irvine" }, { "name": "ashish sharma", "org": "university of california irvine" }, { "name": "a jayaprakash patil", "org": "university of california irvine" }, { "name": "m f estrago", "org": "university of california irvine" }, { "name": "g m seigel", "org": "university at buffalo" }, { "name": "usha p andley", "org": "washington university school of medicine" }, { "name": "m c kenney", "org": "university of california irvine" }, { "name": "b d kuppermann", "org": "university of california irvine" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2008 }, "RgtYvUOP": { "id": "RgtYvUOP", "title": "Effect of Hydroquinone, a Toxicant in Cigarette Smoke, on Human Retinal Pigment Epithelial Cells, Rat Retinal Neurosensory Cells and Human Microvascular Endothelial Cells in vitro", "abstract": "", "keywords": [], "authors": [ { "name": "t h huynh", "org": "university of california irvine" }, { "name": "a sharma", "org": "university of california irvine" }, { "name": "a l gramajo", "org": "university of california irvine" }, { "name": "a jayaprakash patil", "org": "university of california irvine" }, { "name": "m f estrago franco", "org": "university of california irvine" }, { "name": "marilyn chwa", "org": "university of california irvine" }, { "name": "g m seigel", "org": "university at buffalo" }, { "name": "b d kuppermann", "org": "university of california irvine" }, { "name": "m c kenney", "org": "university of california irvine" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2008 }, "UXLlZaBh": { "id": "UXLlZaBh", "title": "Mechanisms of Nicotine Effect on Retinal and Vascular Cells in Culture", "abstract": "", "keywords": [], "authors": [ { "name": "a l gramajo", "org": "Ophthalmology, Centro de Ojos Romagosa- Fundacion VER, Cordoba, Argentina" }, { "name": "a jayaprakash patil", "org": "university of california irvine" }, { "name": "ashish sharma", "org": "university of california irvine" }, { "name": "a neekhra", "org": "university of wisconsin madison" }, { "name": "g m seigel", "org": "university at buffalo" }, { "name": "b d kuppermann", "org": "university of california irvine" }, { "name": "m c kenney", "org": "university of california irvine" } ], "venue": "Investigative Ophthalmology & Visual Science", "year": 2008 }, "0iWyr1Ft": { "id": "0iWyr1Ft", "title": "Central nervous system vasculitis presenting as an ischaemic stroke in a young woman with systemic sclerosis.", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Department of Medicine, Post Graduate Institute of Medical Education and Research and Dr. Ram Manohar Lohia Hospital, Guru Gobind Singh Indraprastha University, New Delhi, India." }, { "name": "Mohammad Ali", "org": "Department of Medicine, Post Graduate Institute of Medical Education and Research and Dr. Ram Manohar Lohia Hospital, Guru Gobind Singh Indraprastha University, New Delhi, India." }, { "name": "Vivek Arya", "org": "Department of Medicine, Post Graduate Institute of Medical Education and Research and Dr. Ram Manohar Lohia Hospital, Guru Gobind Singh Indraprastha University, New Delhi, India." }, { "name": "Piyush Jain", "org": "Department of Medicine, Post Graduate Institute of Medical Education and Research and Dr. Ram Manohar Lohia Hospital, Guru Gobind Singh Indraprastha University, New Delhi, India." } ], "venue": "Rheumatology (Oxford, England)", "year": 2017 }, "GnNSOn0F": { "id": "GnNSOn0F", "title": "Myxoedema coma following commencement of anti-TNF therapy and tuberculosis prophylaxis in a patient with RA and latent tuberculosis infection.", "abstract": "", "keywords": [ "etanercept", "latent tuberculosis", "myxedema", "rheumatoid arthritis", "rifampicin" ], "authors": [ { "name": "Ashok Kumar", "org": "Department of Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, India." }, { "name": "Anunay Agarwal", "org": "Department of Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, India anunayagarwal@gmail.com." }, { "name": "Ashish Sharma", "org": "Department of Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, India." }, { "name": "Divya Agarwal", "org": "Department of Rheumatology, Kailash Hospital and Research Centre Limited, Noida, India." }, { "name": "Nitin Jain", "org": "Department of Critical Care, Fortis Memorial Research Institute, Gurugram, India." }, { "name": "Praveen Gupta", "org": "Department of Neurology, Fortis Memorial Research Institute, Gurugram, India." } ], "venue": "Postgraduate medical journal", "year": 2019 }, "Jw7LbDmZ": { "id": "Jw7LbDmZ", "title": "Images of the month: Lower-back pain in a young man with HLA B27 - not always spondyloarthritis!", "abstract": "Presence of human leucocyte antigen (HLA) B27 in a patient with lower-back pain should not be considered synonymous with axial spondyloarthritis. Other causes of back pain should be ruled-out by careful evaluation. Lumbosacral transitional vertebra is a common congenital malformation of spine which frequently leads to mechanical back pain. We present a young man with lower-back pain who had HLA B27. He was labelled with axial spondyloarthritis elsewhere and was given etanercept without benefit. Further evaluation revealed that he had lumbosacral transitional vertebra and spina bifida occulta. No evidence of sacroiliitis was found. Etanercept was stopped and he was started on physiotherapy protocol for transitional vertebra, with which he improved remarkably. This case highlights the need for greater awareness among clinicians about lumbosacral transitional vertebra, a finding which is frequently missed. Presence of HLA B27 can be coincidental, as in our case.", "keywords": [ "Back pain", "HLA B27", "spina bifida occulta", "spondyloarthritis", "transitional vertebra" ], "authors": [ { "name": "Ashok Kumar", "org": "Fortis Hospital, Noida, India ash.blueney@gmail.com." }, { "name": "Ashish Sharma", "org": "Fortis Flt Lt Rajan Dhall Hospital, New Delhi, India." }, { "name": "Anunay Agarwal", "org": "Aakash Hospital, New Delhi, India." } ], "venue": "Clinical medicine (London, England)", "year": 2020 }, "yyviy2vv": { "id": "yyviy2vv", "title": "'Oil-drop' pigmentation in psoriatic arthritis.", "abstract": "", "keywords": [ "knee", "psoriasis", "rheumatology" ], "authors": [ { "name": "Ashish Sharma", "org": "Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, India ash.blueney@gmail.com." }, { "name": "Anunay Agarwal", "org": "Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, India." }, { "name": "Ashok Kumar", "org": "Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, India." } ], "venue": "Postgraduate medical journal", "year": 2019 }, "XDlMaQHu": { "id": "XDlMaQHu", "title": "Prophylactic platelet transfusion in dengue: Blanket of false comfort?", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Department of Medicine, Postgraduate Institute of Medical Education and Research, Dr RML Hospital New Delhi, C-322, Yojana Vihar, New Delhi, India." }, { "name": "Mohammad Ali", "org": "Department of Medicine, Postgraduate Institute of Medical Education and Research, Dr RML Hospital New Delhi, C-322, Yojana Vihar, New Delhi, India." } ], "venue": "The National medical journal of India", "year": 0 }, "VgtINiqY": { "id": "VgtINiqY", "title": "Risk of lower gastrointestinal bleeding with low-dose aspirin: To give or not to give?", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Ali", "org": "Department of Medicine Dr Ram Manohar Lohia Hospital and Post Graduate Institute of Medical Education and Research, New Delhi, India." }, { "name": "Ashish Sharma", "org": "Department of Medicine Dr Ram Manohar Lohia Hospital and Post Graduate Institute of Medical Education and Research, New Delhi, India." } ], "venue": "The National medical journal of India", "year": 2018 }, "3AIsU4Y6": { "id": "3AIsU4Y6", "title": "Pulmonary artery catheter knotting: are conservative measures always successful? A case report -", "abstract": "Pulmonary artery catheter (PAC) or Swan-Ganz catheter is a flow directed balloon tipped catheter routinely used in patients undergoing Coronary Artery Bypass Grafting (CABG). The reported rate of complications with PAC is 3-17% including arrhythmias, pneumothorax, pulmonary embolism, bacteraemia and death1. Knot formation is an uncommon complication of PAC and is usually managed conservatively2. Here we report about a patient with knotted PAC who required operative intervention after failure of conventional measures as the knot engulfed the tricuspid valve chordae and was fixed.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Department of Cardiothoracic and Vascular Surgery, P.G.I.M.E.R and Dr. RML Hospital, New Delhi, India" }, { "name": "Sushil Kumar Singhal", "org": "Department of Cardiothoracic and Vascular Surgery, P.G.I.M.E.R and Dr. RML Hospital, New Delhi, India" }, { "name": "Vijay Grover", "org": "Department of Cardiothoracic and Vascular Surgery, P.G.I.M.E.R and Dr. RML Hospital, New Delhi, India" }, { "name": "Vijay K. Gupta", "org": "Department of Cardiothoracic and Vascular Surgery, P.G.I.M.E.R and Dr. RML Hospital, New Delhi, India" } ], "venue": "International Surgery Journal", "year": 2016 }, "kIOsu8v1": { "id": "kIOsu8v1", "title": "Utility of circulating cell-free Mycobacterium tuberculosis DNA for the improved diagnosis of abdominal tuberculosis.", "abstract": "Abdominal tuberculosis (ATB) continues to pose a major diagnostic challenge for clinicians due to its nonspecific clinical presentation, variable anatomical location and lack of sensitive diagnostic tools. In spite of the development of several assays till date; no single test has proved to be adequate for ATB diagnosis. In this study, we for the first time report the detection of circulating cell-free Mycobacterium tuberculosis (M. tuberculosis) DNA (cfMTB-DNA) in ascitic fluid (AF) samples and its utility in ATB diagnosis. Sixty-five AF samples were included in the study and processed for liquid culture, cytological, biochemical and molecular assays. A composite reference standard (CRS) was formulated to categorize the patients into 'Definite ATB' (M. tuberculosis culture positive, n = 2), 'Probable ATB' (n = 16), 'Possible ATB' (n = 13) and 'Non-TB' category (n = 34). Two molecular assays were performed, namely, the novel cfMTB-DNA qPCR assay targeting M. tuberculosis devR gene and Xpert MTB/RIF assay (Xpert), and their diagnostic accuracy was assessed using CRS as reference standard. Clinical features such as fever, loss of weight, abdominal distension and positive Mantoux were found to be strongly associated with ATB disease (p<0.05). cfMTB-DNA qPCR had a sensitivity of 66.7% (95% CI:40.9,86.7) with 97.1% specificity (95% CI:84.7,99.9) in 'Definite ATB' and 'Probable ATB' group collectively. The sensitivity increased to 70.9% (95% CI:51.9,85.8) in the combined 'Definite', 'Probable' and 'Possible' ATB group with similar specificity. The cfMTB-DNA qPCR assay performed significantly better than the Xpert assay which demonstrated a poor sensitivity of ≤16.7% with 100% (95% CI:89.7,100) specificity (p<0.001). We conclude that cfMTB-DNA qPCR assay is an accurate molecular test that can provide direct evidence of M. tuberculosis etiology and has promise to pave the way for improving ATB diagnosis.", "keywords": "", "authors": [ { "name": "Pratibha Sharma", "org": "Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, India." }, { "name": "Divya Anthwal", "org": "Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, India." }, { "name": "Pooja Kumari", "org": "Department of Biotechnology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India." }, { "name": "Rakesh Kumar Gupta", "org": "Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, India." }, { "name": "Surabhi Lavania", "org": "Department of Biotechnology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India." }, { "name": "Neera Sharma", "org": "Department of Biochemistry, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Lokesh Kumar Sharma", "org": "Department of Biochemistry, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Deepak Rath", "org": "Department of Medicine, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Pavan Kumar Soraganvi", "org": "Department of Medicine, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Ashish Sharma", "org": "Department of Medicine, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "A K Gadpayle", "org": "Department of Medicine, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "R S Taneja", "org": "Department of Medicine, Dr. Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Jaya Sivaswami Tyagi", "org": "Department of Biotechnology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India." }, { "name": "Sagarika Haldar", "org": "Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, India." } ], "venue": "PloS one", "year": 2020 }, "tYH2v2DU": { "id": "tYH2v2DU", "title": "Lymphoid interstitial pneumonia in a patient with rheumatoid arthritis", "abstract": "", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "Department of Rheumatology, Fortis Flt Lt Rajan Dhall Hospital" }, { "name": "Mohammad Ali", "org": "Department of Medicine, Post Graduate Institute of Medical Education and Research and Dr. Ram Manohar Lohia Hospital, New Delhi, India" }, { "name": "Vivek Arya", "org": "Department of General Medicine, North Devon District Hospital, Barnstaple, UK" } ], "venue": "Rheumatology", "year": 2018 }, "HVzZIjqY": { "id": "HVzZIjqY", "title": "Lupus with \"thumb-prints,\" \"targets,\" and \"combs\".", "abstract": "", "keywords": "", "authors": [ { "name": "Ashok Kumar", "org": "Department of Rheumatology, Fortis Flt. Lt. Rajan Dhall Hospital, New Delhi, India." }, { "name": "Ashish Sharma", "org": "Department of Rheumatology, Fortis Flt. Lt. Rajan Dhall Hospital, New Delhi, India." }, { "name": "Anunay Agarwal", "org": "Department of Rheumatology, Fortis Flt. Lt. Rajan Dhall Hospital, New Delhi, India." } ], "venue": "European journal of rheumatology", "year": 2019 }, "WS9O4Inr": { "id": "WS9O4Inr", "title": "Livedoid vasculopathy presenting with leg ulcers", "abstract": "", "keywords": "", "authors": [ { "name": "Ashok Kumar", "org": "Department of Rheumatology, Fortis Flt Lt Rajan Dhall Hospital, New Delhi, India" }, { "name": "Ashish Sharma", "org": "Department of Rheumatology, Fortis Flt Lt Rajan Dhall Hospital, New Delhi, India" }, { "name": "Anunay Agarwal", "org": "Department of Rheumatology, Fortis Flt Lt Rajan Dhall Hospital, New Delhi, India" } ], "venue": "Rheumatology", "year": 2019 }, "VPS6nZ7W": { "id": "VPS6nZ7W", "title": "Paraneoplastic palmar fasciitis.", "abstract": "", "keywords": "", "authors": [ { "name": "Vivek Arya", "org": "Department of Medicine, PGIMER, Dr R.M.L. Hospital, New Delhi, India." }, { "name": "Mohammad Ali", "org": "Department of Medicine, PGIMER, Dr R.M.L. Hospital, New Delhi, India." }, { "name": "Ashish Sharma", "org": "Department of Medicine, PGIMER, Dr R.M.L. Hospital, New Delhi, India." } ], "venue": "The National medical journal of India", "year": "" }, "GHM6twv2": { "id": "GHM6twv2", "title": "Aspirin prophylaxis: No magical single dose.", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Ali", "org": "Department of Medicine, Dr Ram Manohar Lohia Hospital, New Delhi, C-322, Yojana Vihar, New Delhi 110092, India." }, { "name": "Ashish Sharma", "org": "Fortis Flt. Lt. Rajan Dhall Hospital, New Delhi, India." } ], "venue": "The National medical journal of India", "year": 2019 }, "7DbAHQ7u": { "id": "7DbAHQ7u", "title": "Antiphospholipid syndrome presenting with Hampton's hump.", "abstract": "", "keywords": [ "anticoagulation", "chest imaging", "computed tomography", "rheumatology", "thromboembolism" ], "authors": [ { "name": "Vivek Arya", "org": "General Medicine, North Devon District Hospital, Barnstaple, UK." }, { "name": "Mohammad Ali", "org": "Medicine, Dr Ram Manohar Lohia Hospital and Post Graduate Institute of Medical Education and Research, New Delhi, Delhi, India." }, { "name": "Ashish Sharma", "org": "Rheumatology, Fortis FLT LT Rajan Dhall Hospital, New Delhi, Delhi, India ash.blueney@gmail.com." } ], "venue": "Postgraduate medical journal", "year": 2019 }, "IQu7u5uD": { "id": "IQu7u5uD", "title": "Clinical image: bullous lupus erythematosus.", "abstract": "", "keywords": "", "authors": [ { "name": "Mohammad Ali", "org": "Department of Medicine, Postgraduate Institute of Medical Education and Research, Dr Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Ashish Sharma", "org": "Department of Medicine, Postgraduate Institute of Medical Education and Research, Dr Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Arvind Ahuja", "org": "Department of Pathology, Postgraduate Institute of Medical Education and Research, Dr Ram Manohar Lohia Hospital, New Delhi, India." }, { "name": "Vivek Arya", "org": "Department of Medicine, Postgraduate Institute of Medical Education and Research, Dr Ram Manohar Lohia Hospital, New Delhi, India." } ], "venue": "Rheumatology (Oxford, England)", "year": 2018 }, "bS50aPVl": { "id": "bS50aPVl", "title": "Do Circadian Rhythms Draw the Patterns of Sustained Mental Vigor and Ailment?", "abstract": "Preclinical Research Circadian rhythms are fundamental processes in all cells that coordinate a variety of cellular functions related to a specific time of the day. Disruption of circadian rhythms markedly impacts homeostasis. In this Commentary, we present data that disruption of circadian rhythm may lead to the pathogenesis of neurodegenerative states. In this context, we further argue that there is an urgent need of developing new generations of compounds, chronobiotics, to modulate the molecular substrates of circadian timing system. Chronobiotics conceptually offer an effective way for restoration and protection from the consequences of the circadian disruption. We also briefly discuss whether dysfunctional circadian rhythms are a major driver of aging. Drug Dev Res 00 : 000-000, 2016. © 2016 Wiley Periodicals, Inc.", "keywords": [ "Alzheimer's disease", "aging", "chronobiology", "neurodegeneration", "redox states", "suprachiasmatic nucleus" ], "authors": [ { "name": "Ashish Sharma", "org": "School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh, India. ashrma.pcl@gmail.com." }, { "name": "Rohit Goyal", "org": "School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh, India." } ], "venue": "Drug development research", "year": 2016 }, "MNVgGSFj": { "id": "MNVgGSFj", "title": "Experimental Brain Ischemic Preconditioning: A Concept to Putative Targets.", "abstract": "Abstract Neurodegeneration is the progressive loss of central neurons which may instigate many disabling psychological and neurological disorders like Alzheimeru0027s disease, schizophrenia, parkinsonu0027s disease, prionu0027s disease, and Huntingtonu0027s disease. It has become imperative to address the need to discover novel molecular targets and therapeutic strategies to combat neurodegeneration. It is more essential to do so, because most of the accessible treatment focuses on correcting the symptoms of such diseases rather than its underlying pathophysiology. In the present article, we sought to discuss plausible connections between brain ischemic preconditioning and protective measures against chemical neurotoxicity. Brain ischemic preconditioning is reported to be effective against stroke like conditions and is studied chiefly to identify culpable molecular targets. Similarly chemical stressors are reported to be effective in preconditioning neuronal cells against chemical neurotoxicity. Keeping the concept of cross-tolerance in mind this article encompasses the putative targets of both chemical preconditioning and ischemic preconditioning in search for a suitable connection based on the published literature. The distinctive groups of targets are individually discussed and principal targets such as oncogene Akt, glycogen synthase kinase 3-beta and heat shock proteins are emphasised. Identification of these targets may help to develop sophisticated newer therapeutic strategies to cure neurodegenerative disorders.", "keywords": "", "authors": [ { "name": "Ashish Sharma", "org": "" }, { "name": "Rohit Goyal", "org": "" } ], "venue": "Cns & Neurological Disorders-drug Targets", "year": 2016 }, "u614uY6N": { "id": "u614uY6N", "title": "COVID-19: Underpinning Research for Detection, Therapeutics, and Vaccines Development.", "abstract": "The published results of SARS-CoV-2 structures and interactomics have been used to identify potential therapeutic candidates. We illustrate recent publications on SARS-CoV-2, concerning its molecular, epidemiological, and clinical characteristics, and focus oninnovative diagnostics technologies in the production pipeline. This objective of this review is to enhance the comprehension of the unique characteristics of SARS-CoV-2and strengthen future control measures.", "keywords": [ "Epidemiology", "SARS-CoV-2", " COVID-19", " Therapeutics", " Pandemics", "Therapeutics repurposing", "Viruses" ], "authors": [ { "name": "Alaa A A Aljabali", "org": "Yarmouk University, Faculty of Pharmacy,Department of Pharmaceutics and Pharmaceutical Technology, Irbid 566. Jordan." }, { "name": "Hamid A Bakshi", "org": "School of Pharmacy and Pharmaceutical Science, Ulster University, Coleraine, County Londonderry, Northern Ireland. United Kingdom." }, { "name": "Saurabh Satija", "org": "School of Pharmaceutical Sciences, Lovely Professional University, Phagwara-144411, Punjab. India." }, { "name": "Meenu Metha", "org": "School of Pharmaceutical Sciences, Lovely Professional University, Phagwara-144411, Punjab. India." }, { "name": "Parteek Prasher", "org": "Department of Chemistry, University of Petroleum & Energy Studies, Dehradun 248007. India." }, { "name": "Raed M Ennab", "org": "Department of clinical sciences, Faculty of Medicine, Yarmouk University, Irbid 566. Jordan." }, { "name": "Dinesh Kumar Chellapan", "org": "Department of Life Sciences, School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur 57000. Malaysia." }, { "name": "Gaurav Gupta", "org": "School of Pharmacy, Suresh Gyan Vihar University, Jagatpura, Jaipur 302017. India." }, { "name": "Poonam Negi", "org": "School of Pharmaceutical Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, India 173229. India." }, { "name": "Rohit Goyal", "org": "Neuropharmacology Laboratory, School of Pharmaceutical Sciences, Shoolini University, Solan 173 212, Himachal Pradesh. India." }, { "name": "Ashish Sharma", "org": "Neuropharmacology Laboratory, School of Pharmaceutical Sciences, Shoolini University, Solan 173 212, Himachal Pradesh. India." }, { "name": "Vijay Mishra", "org": "School of Pharmaceutical Sciences, Lovely Professional University, Phagwara-144411, Punjab. India." }, { "name": "Harish Dureja", "org": "Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, 124001. India." }, { "name": "Kamal Dua", "org": "Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Ultimo NSW 2007. Australia." }, { "name": "Murtaza M Tambuwala", "org": "School of Pharmacy and Pharmaceutical Science, Ulster University, Coleraine, County Londonderry, Northern Ireland. United Kingdom." } ], "venue": "Pharmaceutical nanotechnology", "year": 2020 }, "DRV7eFWL": { "id": "DRV7eFWL", "title": "Alteration in memory cognition due to activation of caveolin-1 and oxidative damage in a model of dementia of Alzheimer's type.", "abstract": "The findings from the present investigation may conclude that the caveolin-1 from caveolae at the cell membrane induces memory deficits and oxidative stress phenotype that resemble the neurological phenotype of Alzheimer's disease. Further studies are warranted to gauge the effect of caveolin dyshomeostasis on the amyloidogenic cascade.", "keywords": [ "Alzheimer's", "amyloid", "caveolin", "memory", "streptozotocin" ], "authors": [ { "name": "Ankita Gupta", "org": "Department of Neuropharmacology, School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Neuropharmacology, School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh, India." }, { "name": "Anil Kumar", "org": "Department of Pharmacology, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India." }, { "name": "Rohit Goyal", "org": "Department of Neuropharmacology, School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh, India." } ], "venue": "Indian journal of pharmacology", "year": "" }, "yYCTUOop": { "id": "yYCTUOop", "title": "Alteration in memory cognition due to activation of caveolin-1 and oxidative damage in a model of dementia of Alzheimer's type", "abstract": "", "keywords": "", "authors": [ { "name": "Rohit Goyal", "org": "" }, { "name": "Ankita Gupta", "org": "" }, { "name": "Ashish Sharma", "org": "" }, { "name": "Anil Kumar", "org": "" } ], "venue": "Indian Journal of Pharmacology", "year": 2019 }, "LVloxVwj": { "id": "LVloxVwj", "title": "Circadian rhythm disruption and Alzheimer's disease: The dynamics of a vicious cycle.", "abstract": "All mammalian cells exhibit circadian rhythm in cellular metabolism and energetics. Autonomous cellular clocks are modulated by various pathways that are essential for robust time keeping. In addition to the canonical transcriptional translational feedback loop, several new pathways of circadian timekeeping - non-transcriptional oscillations, post-translational modifications, epigenetics and cellular signaling in the circadian clock - have been identified. The physiology of circadian rhythm is expansive, and its link to the neurodegeneration is multifactorial. Circadian rhythm disruption is prevelant in contamporary society where light-noise, shift-work, and transmeridian travel are commonplace, and is also reported from the early stages of Alzheimer's disease (AD). Circadian alignment by bright light therapy in conjunction with chronobiotics is beneficial for treating sundowning syndrome and other cognitive symptoms in advanced AD patients. We performed a comprehensive analysis of the clinical and translational reports to review the physiology of the circadian clock, delineate its dysfunction in AD, and unravel the dynamics of the vicious cycle between two pathologies. The review delineates the role of putative targets like clock proteins PER, CLOCK, BMAL1, ROR, and clock-controlled proteins like AVP, SIRT1, FOXO, and PK2 towards future approaches for management of AD. Furthermore, the role of circadian rhythm disruption in aging is delineated.", "keywords": [ "aging", "circadian rhythm coupling", "post-translational\nmodifications", "redox", "sleep-wake cycle", "suprachiasmatic nuclei" ], "authors": [ { "name": "Ashish Sharma", "org": "1Neuropharmacology Laboratory, School of Pharmaceutical Sciences, Shoolini University, Solan 173 212, Himachal Pradesh. India." }, { "name": "Gautam Sethi", "org": "Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Medical Drive, 117 600. Singapore." }, { "name": "Murtaza M Tambuwala", "org": "School of Pharmacy and Pharmaceutical Sciences, Ulster University, Coleraine, County, Londonderry, BT52 1SA, Northern Ireland. United Kingdom." }, { "name": "Alaa A A Aljabali", "org": "Faculty of Pharmacy, Department of Pharmaceutical Sciences, Yarmouk University, Irbid 21163. Jordan." }, { "name": "Dinesh Kumar Chellappan", "org": "Department of Life Sciences, School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur, 57000. Malaysia." }, { "name": "Kamal Dua", "org": "Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Ultimo, NSW, 2007. Australia." }, { "name": "Rohit Goyal", "org": "Neuropharmacology Laboratory, School of Pharmaceutical Sciences, Shoolini University, Solan 173 212, Himachal Pradesh. India." } ], "venue": "Current neuropharmacology", "year": 2020 }, "mujNvPLT": { "id": "mujNvPLT", "title": "Is skip metastases associated with tumor thickness and tumor size in tongue carcinoma patients?", "abstract": "The article reveals the positive relationship between tumor thickness, tumor size, and skip metastasis. The analysis shows tumor thickness as a higher predictor for skip metastasis with odds ratio of 5.5 compared to the tumor size having odd ratio 2.", "keywords": [ "Skip metastasis", "Tongue carcinoma", "Tumor size", "Tumor thickness" ], "authors": [ { "name": "Sanjay Rastogi", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Center, Moradabad, UP, 243001, India. docos79@gmail.com." }, { "name": "Ashish Sharma", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Center, Moradabad, UP, 243001, India." }, { "name": "Hessa Al Wayli", "org": "Department of Oral and Maxillofacial Surgery, CKS Theja Dental College, Tirupati, India." }, { "name": "Rupshikha Choudhury", "org": "Department of Oral and Maxillofacial Surgery, Institute of Dental Sciences, Bareilly, Uttar Pradesh, India." }, { "name": "Siddhi Tripathi", "org": "Department of Prosthodontics, Kothiwal Dental College and Research Centre, Moradabad, UP, India." }, { "name": "Saurav Kumar", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Center, Moradabad, UP, 243001, India." } ], "venue": "Clinical oral investigations", "year": 2018 }, "6ZaNZlvo": { "id": "6ZaNZlvo", "title": "Combination of Articaine and Ketamine V/S Articaine Alone After Surgical Extraction of Impacted Third Molars.", "abstract": "In this present study, the effect of articaine with ketamine in comparison with articaine alone intraoperatively and postoperatively was observed, and it revealed that the combination of articaine with ketamine produced good local anesthesia and provide good postoperative analgesia with less swelling and significantly less trismus.", "keywords": [ "Mesioangular impaction", "articaine", "ketamine" ], "authors": [ { "name": "Tushar Dubey", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Manpreet Singh", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Ashish Sharma", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Shyamalendu Laskar", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Arpit Vashistha", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." } ], "venue": "Annals of maxillofacial surgery", "year": 2020 }, "1NmnG7a4": { "id": "1NmnG7a4", "title": "Is treatment with platelet-rich fibrin better than zinc oxide eugenol in cases of established dry socket for controlling pain, reducing inflammation, and improving wound healing?", "abstract": "PRF is a better alternative than ZOE for the effective management of alveolar osteitis.", "keywords": [ "Dry socket", "Pain", "Platelet-rich fibrin", "Wound healing" ], "authors": [ { "name": "Sam Paul", "org": "Department of Orthodontics and Dentofacial Orthopaedics, Educare Institute of Dental Sciences, Malappuram, India." }, { "name": "Rupshikha Choudhury", "org": "Department of Oral and Maxillofacial Surgery, Regional Dental College, Guwahati, India." }, { "name": "Nandini Kumari", "org": "Faculty of Dental Sciences, Trauma Centre, Banaras Hindu University, Varanasi, India." }, { "name": "Sanjay Rastogi", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre (KDCRC), Moradabad, India." }, { "name": "Ashish Sharma", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre (KDCRC), Moradabad, India." }, { "name": "Vikas Singh", "org": "Department of Public Health Dentistry, Teerthanker Mahaveer Dental College and Research Centre (TMDCRC), Moradabad, India." }, { "name": "Shyamalendu Laskar", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre (KDCRC), Moradabad, India." }, { "name": "Tushar Dubey", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre (KDCRC), Moradabad, India." } ], "venue": "Journal of the Korean Association of Oral and Maxillofacial Surgeons", "year": 2019 }, "outsavtz": { "id": "outsavtz", "title": "Use of Transgingival Lag Screw Osteosynthesis in the Management of Alveolar Process Fracture.", "abstract": "The purpose of this study is to check the efficacy of transgingival lag screw osteosynthesis in alveolar process fractures of maxilla and mandible. A single-arm nonrandomized observational study was performed for the treatment of alveolar process fractures of maxilla and mandible. In this study, 20 mixed age group patients with alveolar process fracture were included. All the patients were treated by a 2.0-mm transgingival screw fixation under local or general anesthesia. All the patients were evaluated for fracture stability, anatomical reduction, bone loss and bone resorption of alveolar process, tooth loss, and wound infection at 3 months of follow-up. A simple descriptive statistical analysis was done to evaluate the parameters and it was shown that the treatment of alveolar process fracture with two or three lag screws provides adequate fracture stability and anatomical reduction with no signs of bone loss and tooth loss, and wound infections were noted post lag screw fixation. The study concludes that transgingival lag screw fixation is a suitable alternative for alveolar process fractures in all the age groups and two to three lag screws are generally sufficient to fix fractured alveolar process either under local anesthesia or general anesthesia.", "keywords": [ "alveolar process fracture", "lag screw", "osteosynthesis", "trauma" ], "authors": [ { "name": "Ashish Sharma", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Sanjay Rastogi", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Manish Shukla", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Rupshikha Choudhury", "org": "Department of Oral and Maxillofacial Surgery, Regional Dental College, Guwahati, Assam, India." }, { "name": "Siddhi Tripathi", "org": "Department of Prosthodontics, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." }, { "name": "Jawed Iqbal", "org": "Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India." } ], "venue": "Craniomaxillofacial trauma & reconstruction", "year": 2019 }, "bD0bAjqO": { "id": "bD0bAjqO", "title": "Is Superselective Neck Dissection Safer Than Supraomohyoid Neck Dissection for Oral Carcinoma Patients With N0 Neck in Terms of Shoulder Morbidity and Recurrence Rate?", "abstract": "To estimate the clinical and functional results of patients who underwent distinctive types of neck dissection, with particular emphasis on shoulder function, rate of recurrence, and quality of life in patients with N0 neck.A randomized clinical trial was conducted from August 2014 to March 2017 in which 20 adult patients with T1 to T3 lesions of the oral cavity and N0 neck were included. Patients were randomly allocated to group I (n = 10; selective neck dissection) or group II (n = 10; superselective neck dissection). All patients were evaluated objectively for degree of arm abduction and subjectively for quality of life using a questionnaire completed pre- and postoperatively at 6 months. Also, locoregional recurrence was investigated for 2.5 years. Data were scrutinized by applying mean and standard deviation, unpaired t test, Mann-Whitney U test, and Kaplan-Meier test.Mean values of the Arm Abduction Test and quality-of-life scores were statistically significant (P < .05) for group II compared with group I at all intervals. Data analyzed for locoregional recurrence showed a statistically significant difference between groups (P < .05), with group II having the better outcome.The results showed less shoulder morbidity and improved quality of life for superselective neck dissection (group II) compared with selective neck dissection (group I). Furthermore, group II was better for locoregional recurrence, which determines the oncologic safety of the procedure.", "keywords": "", "authors": [ { "name": "Sanjay Rastogi", "org": "Professor and Head, Department of Oral and Maxillofacial Surgery, KDCRC, Moradabad, UP, India." }, { "name": "Ashish Sharma", "org": "Reader, Department of Oral and Maxillofacial Surgery, Kothiwal Dental College and Research Centre, Moradabad, UP, India." }, { "name": "Rupshikha Choudhury", "org": "Lecturer, Department of Oral and Maxillofacial Surgery, Regional Dental College Guwahati, Assam, India." }, { "name": "Siddhi Tripathi", "org": "Reader, Department of Prosthodontics, Kothiwal Dental College and Research Centre, Moradabad, UP, India." }, { "name": "Hessa Al Wayli", "org": "Consultant, Oral Medicine and Radiology, Riyadh Dental Administration, Riyadh, Saudi Arabia." }, { "name": "Anand Amrithraj", "org": "Professor and Head, Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Mangalore, Karnataka, India." }, { "name": "Mahendra P Reddy", "org": "University of Colorado, School of Dental Medicine, Denver, CO." } ], "venue": "Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons", "year": 2017 }, "Z8gpGoMW": { "id": "Z8gpGoMW", "title": "Effect of Preparation Taper, Height and Marginal Design Under Varying Occlusal Loading Conditions on Cement Lute Stress: A Three Dimensional Finite Element Analysis", "abstract": "To assess the effect of preparation taper, height and margin design under different loading conditions on cement lute stress. A 3-D FE model of an upper second premolar and molar was developed from CT scan of human skull using software programmes (MIMICS, Hypermesh and ANSYS). 10° and 30° taper, 3 and 5 mm preparation height and shoulder and chamfer finish lines were used. Type 1 Glass ionomer cement with 24 μm lute width was taken and the model was loaded under 100 N horizontal point load, vertical point load distributed axial load. The maximum shear stress and Von Mises stress within the cement lute were recorded. The maximum shear stresses ranged from 1.70 to 3.93 MPa (horizontal point loading), 0.66 to 3.04 MPa (vertical point loading), 0.38 to 0.87 MPa (distributed loading). The maximum Von Mises stresses ranged from 3.39 to 10.62 MPa (horizontal point loading), 1.93 to 8.58 MPa (vertical point loading) and 1.49 to 3.57 MPa (distributed loading). The combination of 10° taper and 5 mm height had the lowest stress field while the combination of 30° taper and 5 mm height had the highest stress field. Distributed axial loading shows least stress, better stress homogenization and gives a favorable prognosis for the fixed prostheses. Smaller preparation taper of 10° is biomechanically more acceptable than a 30° taper. It is desirable to decrease taper as height increases. The chamfer margin design is associated with greater local cement stresses toward the margins that could place the cement at greater risk for microfracture and failure. ", "keywords": [ "Cement lute", "Finish line", "Finite element analysis", "Height", "Occlusal loading", "Taper" ], "authors": [ { "name": "siddhi tripathi", "org": "Department of Prosthodontics Including Crown and Bridge and Implantology,Kothiwal Dental College & Research Centre,Moradabad,India" }, { "name": "g s amarnath", "org": "Department of Prosthodontics Including Crown and Bridge and Implantology,M R Ambedkar Dental College & Hospital,Bangalore,India" }, { "name": "b c muddugangadhar", "org": "Department of Prosthodontics Including Crown and Bridge and Implantology,M R Ambedkar Dental College & Hospital,Bangalore,India" }, { "name": "ashish sharma", "org": "Department of Oral & Maxillofacial Surgery,Kothiwal Dental College & Research Centre,Moradabad,India" }, { "name": "suchismita choudhary", "org": "Department of Prosthodontics Including Crown and Bridge and Implantology,College of Dental Science and Research Centre,Ahmedabad,India" } ], "venue": "Journal of Indian Prosthodontic Society", "year": 2014 }, "WqkPVaMZ": { "id": "WqkPVaMZ", "title": "Learning 3D Human Body Embedding.", "abstract": " Although human body shapes vary for different identities with different poses, they can be embedded into a low-dimensional space due to their similarity in structure. Inspired by the recent work on latent representation learning with a deformation-based mesh representation, we propose an autoencoder like network architecture to learn disentangled shape and pose embedding specifically for 3D human body. We also integrate a coarse-to-fine reconstruction pipeline into the disentangling process to improve the reconstruction accuracy. Moreover, we construct a large dataset of human body models with consistent topology for the learning of neural network. Our learned embedding can achieve not only superior reconstruction accuracy but also provide great flexibilities in 3D human body creations via interpolation, bilateral interpolation and latent space sampling, which is confirmed by extensive experiments. The constructed dataset and trained model will be made publicly available. ", "keywords": "", "authors": [ { "name": "Boyi Jiang", "org": "" }, { "name": "Juyong Zhang", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "arXiv: Computer Vision and Pattern Recognition", "year": 2019 }, "2m3TJAEd": { "id": "2m3TJAEd", "title": "Real-time 3D markerless multiple hand detection and tracking for human computer interaction applications", "abstract": "In this paper we present a purely vision based implementation of markerless hand detection and tracking system which effectively detects and tracks the hand positions irrespective of hand orientation. A shape based detection algorithm using a new line approximation technique followed by an adaptive minimum distance classifier based tracking technique is implemented. The technique is very generic and can be practically used in all types of immersive and semi-immersive environments like simulations, three-dimensional (3D) games, visually assisted medical surgery and other human-computer interactive applications. The proposed technique overcomes certain limitations of glove based, handheld object based and marker based techniques for a truly immersive experience. The technique also overcomes the main limitation of previous vision based hand tracking systems by providing much larger degrees of freedom essential for effective virtual reality systems. The novelty of the technique proposed is that it separates the detection and tracking parts and therefore allows tracking of multiple hands in a 3D space for real-time interaction.", "keywords": [ "human computer interaction application", "markerless multiple hand detection", "hand position", "proposed technique", "previous vision", "markerless hand detection", "immersive experience", "detection algorithm", "adaptive minimum distance classifier", "multiple hand", "hand orientation", "new line approximation technique", "human computer interaction", "binocular vision", "tracking system", "three dimensional", "real time", "virtual reality", "degree of freedom" ], "authors": [ { "name": "Soumita Ghosh", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Wenyu Chen", "org": "Nanyang Technological University" }, { "name": "Jane Zhang", "org": "California Polytechnic State University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" } ], "venue": "VRCAI", "year": 2010 }, "b0atVNNK": { "id": "b0atVNNK", "title": "Generalized hierarchical NURBS for interactive shape modification", "abstract": "In a three dimensional (3D) environment, having the capability of local shape refinement and modification is highly desired for interactive free-form shape design. The introduction of hierarchical B-spline has provided a nice mechanism to control the influence of refinement to the locality for tensor-product B-spline surfaces. This paper extends the idea of hierarchical B-splines to non-uniform rational B-spline (NURBS) surface and a generalized hierarchical NURBS (H-NURBS) is proposed. Based on the modification of control points or weights of the H-NURBS surface, we can paste a NURBS surface onto an existing H-NURBS surface. Two approaches with different mechanisms are proposed: the base plus detail mechanism and the replacement mechanism. Different kinds of interactive devices like mouse, stylus and glove can be used to manipulate the H-NURBS.", "keywords": [ "interactive shape modification", "nice mechanism", "generalized hierarchical nurbs", "nurbs surface", "tensor-product b-spline surface", "hierarchical b-spline", "detail mechanism", "different mechanism", "existing h-nurbs surface", "h-nurbs surface", "hierarchical b-splines", "tensor product", "refinement", "three dimensional", "nurbs" ], "authors": [ { "name": "Wenyu Chen", "org": "Nanyang Technological University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" } ], "venue": "VRCAI", "year": 2008 }, "ouWo6nPW": { "id": "ouWo6nPW", "title": "Unsupervised Dense Light Field Reconstruction with Occlusion Awareness", "abstract": "", "keywords": "", "authors": [ { "name": "Lixia Ni", "org": "Zhejiang University China" }, { "name": "Haiyong Jiang", "org": "#N# Nanyang Technological University, Singapore" }, { "name": "Jianfei Cai", "org": "#N# Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "#N# Nanyang Technological University, Singapore" }, { "name": "Haifeng Li", "org": "Zhejiang University China" }, { "name": "Xu Liu", "org": "Zhejiang University China" } ], "venue": "", "year": 2019 }, "TSO8cmtW": { "id": "TSO8cmtW", "title": "Skeleton-Aware 3D Human Shape Reconstruction From Point Clouds", "abstract": "", "keywords": "", "authors": [ { "name": "Haiyong Jiang", "org": "Nanyang Technological University" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" } ], "venue": "", "year": 2019 }, "aUkQejDY": { "id": "aUkQejDY", "title": "Monge mapping using hierarchical NURBS", "abstract": "Texture mapping is an efficient and effective tool in computer graphics and animation. While computationally very cost-effective, texture mapping may produce non-realistic appearances of shapes in 3D environment, especially when viewing closely. To improve the realism of 3D modeling, bump mapping technique is developed to add details with the 3D models on top of texture mapping. Bump mapping, however, offers only simple and visual enhancement. Displacement mapping technique can further improve the localized detail of geometry. In this paper, Monge mapping technique is developed for detail and local shape modification of NURBS represented geometry in a 3D environment. Based on multiresolution and refinement schemes, Hierarchical NURBS (H-NURBS) is first investigated to design a mechanism for the purpose of carrying localized geometric information. Monge mapping on H-NURBS patch can be easily performed via simple cut-and-paste operation. Parametric control of the local shapes is developed to facilitate easier and better 3D local modeling.", "keywords": [ "bump mapping technique", "hierarchical nurbs", "local shape modification", "bump mapping", "local shape", "monge mapping", "monge mapping technique", "displacement mapping technique", "texture mapping", "depth · texture mapping · hierarchical nurbs · 3d local shape modeling", "local modeling", "h-nurbs patch", "cost effectiveness", "computer graphic" ], "authors": [ { "name": "Wenyu Chen", "org": "Nanyang Technological University, School of Mechanical & Aerospace Engineering, 50 Nanyang Avenue, 639798, Singapore, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, School of Computer Engineering, 50 Nanyang Avenue, 639798, Singapore, Singapore" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University, School of Mechanical & Aerospace Engineering, 50 Nanyang Avenue, 639798, Singapore, Singapore" } ], "venue": "The Visual Computer", "year": 2010 }, "1qbfhr2I": { "id": "1qbfhr2I", "title": "Curvature tensor computation by piecewise surface interpolation", "abstract": "Estimating principal curvatures and principal directions of a smooth surface represented by a triangular mesh is an important step in many CAD or graphics related tasks. This paper presents a new method for curvature tensor estimation on a triangular mesh by replacing flat triangles with triangular parametric patches. An improved local interpolation scheme of cubic triangular Bezier patches to vertices and vertex normals of triangle meshes is developed. Piecewise parametric surfaces that have C^0 continuity across boundary curves of adjacent patches and G^1 continuity at the joint vertices are obtained by the interpolation scheme. A closed form expression of Taubin integral-a 3x3 symmetric matrix in integral formulation-is derived based on the piecewise parametric surfaces. Principal curvatures and principal directions are then computed from the Taubin integral. The proposed method does not need to parameterize data points or solve a linear system which is usually required by other surface fitting methods. Compared to several state-of-the-art curvature estimation methods, the proposed method can generate more accurate results for general surface meshes. The experiments have demonstrated its accuracy, robustness and effectiveness.", "keywords": [ "curvature tensor", "closed form formula" ], "authors": [ { "name": "Xunnian Yang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Computer-Aided Design", "year": 2013 }, "1FW2yieH": { "id": "1FW2yieH", "title": "GPU-based Multiple-Choice Scheme for Mesh Simplification.", "abstract": "This paper presents a novel GPU-based parallel algorithm to simplify triangular meshes. Existing GPU based methods usually produce simplified meshes with lower quality. This is generally because they put more emphasis on parallelism than mesh quality. After a thorough analysis of the existing methods, we propose a GPU based multiple-choice mechanism, which combines multiple-choice decimation and GPU-based parallel simplification, to balance the mesh quality and computational speed. As a result, our algorithm improves the quality of the simplified meshes and also achieves high speed-up provided by GPU. The experiments and the comparison with the prior art confirm the performance of the proposed algorithm.", "keywords": "", "authors": [ { "name": "Naimin Koh", "org": "Nanyang Technological University, Autodesk Inc., Singapore" }, { "name": "Wenjing Zhang", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University, Singapore" } ], "venue": "CGI", "year": 2018 }, "I66yG55D": { "id": "I66yG55D", "title": "Modeling deviations of rgb-d cameras for accurate depth map and color image registration.", "abstract": "A fundamental step to employ RGB-D cameras is to register color and depth images, whose misalignment may be caused by differences of camera poses and parameters, depth noises, etc. Previous methods mainly devote to more accurate camera calibration, which can only deal with misalignment that are parameterized with camera projection model. Other misalignment, which we call deviations, are more difficult to be measured and modeled. In this paper, we propose a method to model and remove RGB-D camera deviations. First, a specially-designed checkerboard with hollow squares is utilized to measure deviations and camera parameters, it takes advantage of the regularity of corner arrangements and can achieve high accuracy even with noisy depth inputs. Second, we propose a general deviation model to deal with irregular deviations that can not be handled by RGB-D camera projection model. Third, we introduce a registration method that incorporates the estimated deviation model to well register color and depth information. As demonstrated in the experiments, comparing with manufacturer’s calibration and some state-of-the-art algorithms, our approach produces significant better accuracy.", "keywords": [ "RGB-D cameras", " Camera calibration", " Registration", " Deviations", " Computer vision" ], "authors": [ { "name": "Xibin Song", "org": "Shandong Uiversity" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Fan Zhong", "org": "Shandong Uiversity" }, { "name": "Xueying Qin", "org": "Shandong Uiversity" } ], "venue": "Multimedia Tools Appl.", "year": 2018 }, "Th9bU0QK": { "id": "Th9bU0QK", "title": "A color-guided, region-adaptive and depth-selective unified framework for Kinect depth recovery", "abstract": "Considering the existing depth recovery approaches that have different limitations when applying to Kinect depth data, in this paper, we propose to integrate their effective features including adaptive support region selection, reliable depth selection and color guidance together under a unified framework for Kinect depth recovery. In particular, we formulate our depth recovery as an energy minimization problem, which solves the depth hole-filling and denoising simultaneously. The energy function consists of a fidelity term and a regularization term. The fidelity term takes into account the characteristics of Kinect data. The regularization term is designed to incorporate the joint bilateral filtering (JBF) kernel and the joint trilateral filtering (JTF) kernel so as to facilitate both depth hole-filling and denoising. Moreover, the JBF kernel is modified to incorporate the structure information. Both simulations on the benchmark Middlebury dataset and experiments on real Kinect data show that our proposed method achieves state-of-the-art performance in terms of recovery accuracy and visual quality.", "keywords": [ "region-adaptive unified framework", "energy function", "fidelity term", "color-guided unified framework", "color guidance", "effective features", "middlebury dataset", "image denoising", "jbf kernel", "denoising", "joint bilateral filtering kernel", "filtering theory", "reliable depth selection", "depth hole-filling", "kinect depth recovery", "depth-selective unified framework", "energy minimization problem", "adaptive support region selection", "image colour analysis", "regularization term" ], "authors": [ { "name": "Chongyu Chen", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Tat-Jen Cham", "org": "" }, { "name": "Guangming Shi", "org": "" } ], "venue": "MMSP", "year": 2013 }, "qg9Nir5k": { "id": "qg9Nir5k", "title": "A GPU-Enabled Parallel Genetic Algorithm for Path Planning of Robotic Operators", "abstract": "", "keywords": [], "authors": [ { "name": "panpan cai", "org": "nanyang technological university" }, { "name": "yiyu cai", "org": "nanyang technological university" }, { "name": "indhumathi chandrasekaran", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" } ], "venue": "", "year": 2015 }, "yEHleKbA": { "id": "yEHleKbA", "title": "PCMD: personality-characterized mood dynamics model toward personalized virtual characters", "abstract": "How to endow the virtual characters with personalized behavior patterns remains a challenging problem. Instead of heuristically designing behaviors for certain personalities, this paper bridges the gap between personalities and behaviors using a medium concept, mood, to make the behaviors of the characters consistent enough to convey their personalities, while flexible enough to make appropriate response in various situations. We propose a personality-characterized mood dynamics model, in which the emotion weights are computed as a solution of a convex optimization problem that is constructed to make the overall mood approaches the personality after sufficient interactions. The convergence of the algorithm is demonstrated by numerical simulations. The implementation of the personality-characterized mood dynamics model enables an emotion-oriented virtual human, Sophie, to show personalized behaviors in the emotional interactions with users. Copyright © 2015 John Wiley & Sons, Ltd.", "keywords": [], "authors": [ { "name": "Juzheng Zhang", "org": "School of Computer Engineering, Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Nadia Magnenat-Thalmann", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" } ], "venue": "Journal of Visualization and Computer Animation", "year": 2015 }, "HlPqFgFj": { "id": "HlPqFgFj", "title": "Real-Time and Realistic Simulation for Cardiac Intervention with GPU", "abstract": "Cardiovascular disease is the number one cause of death today in developed countries and is projected to remain so. Cardiac intervention is a minimally invasive solution to diagnose and treat the disease. Training of young cardiologists is playing an important role towards quality cardiac healthcare. The advance of interactive and graphics technologies has offered a new avenue to train young cardiologists using virtual patients which can tremendously reduce the cost and risk. This paper presents a novel interactive simulation for cardiac intervention. Two-body collision between the catheter and the heart wall is detected based on a boundary representation. GPU based algorithms are developed to enhance the performance of simulator for real-time and realistic cardiac intervention.", "keywords": [ "novel interactive simulation", "heart wall", "minimally invasive treatment", "diseases", "gpu", "two-body collision", "cardiac intervention", "graphics technology", "computer graphics", "interactive technology", "developed country", "cardiovascular disease", "real-time simulation", "interactive", "catheter", "cardiovascular system", "young cardiologist", "realistic cardiac intervention", "boundary representation", "realistic simulation", "virtual reality", "minimally invasive diagnosis", "medical diagnostic computing", "quality cardiac healthcare", "catheters", "developing country", "cause of death" ], "authors": [ { "name": "Rongdong Yu", "org": "" }, { "name": "Sanyuan Zhang", "org": "" }, { "name": "Patricia Chiang", "org": "" }, { "name": "Yiyu Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Computer Modeling and Simulation, 2010. ICCMS '10. Second International Conference", "year": 2010 }, "Z5AJw2JD": { "id": "Z5AJw2JD", "title": "Adaptive T-spline surface fitting to z-map models", "abstract": "Surface fitting refers to the process of constructing a smooth representation for an object surface from a fairly large number of measured 3D data points. This paper presents an automatic algorithm to construct smooth parametric surfaces using T-splines from z-map data. The algorithm begins with a rough surface approximation and then progressively refines it in the regions where the approximation accuracy does not meet the requirement. The topology of the resulting T-spline surface is determined adaptively based on the local geometric character of the input data and the geometry of the control points is obtained by a least squares procedure. The advantage of the approach is that the resulting surface is C2 continuous and the refinement is essentially local, resulting in a small number of control points for the surface.", "keywords": [ "rough surface approximation", "input data", "resulting surface", "object surface", "adaptive t-spline surface fitting", "control point", "data point", "approximation accuracy", "z-map data", "surface fitting", "t-spline surface", "parametric surface", "surface reconstruction", "least square", "t splines" ], "authors": [ { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Yimin Wang", "org": "Nanyang Technological University, Singapore" }, { "name": "Hock Soon Seah", "org": "Nanyang Technological University, Singapore" } ], "venue": "GRAPHITE", "year": 2005 }, "JgnaP3sP": { "id": "JgnaP3sP", "title": "Illumination and view dependent progressive transmission of semi-regular meshes with subdivision connectivity", "abstract": "For wireless network based graphics applications, a key challenge is how to efficiently transmit complex 3D models over bandwidth-limited wireless channels. Recently, several view-dependent 3D progressive mesh transmission schemes have been proposed, which save the transmission bandwidth through only delivering the visible portions of a mesh model. In this paper, we propose to incorporate the illumination effects into the existing view-depend progressive mesh transmission system to further improve the performance. In particular, we propose a novel distortion model, which consists of both illumination distortion and geometry distortion. We further simplify the distortion model in order to compute the rate-distortion function for each segment of a mesh model in a fast manner. Based on our proposed simplified distortion model, given the viewing and lighting parameters, we are able to optimally allocate bits among different segments in real time. Experimental results show that significant quality improvement can be achieved by taking into account the illumination effects.", "keywords": [ "mesh model", "progressive mesh transmission scheme", "illumination distortion", "novel distortion model", "semi-regular mesh", "geometry distortion", "subdivision connectivity", "distortion model", "transmission bandwidth", "transmission system", "existing view-depend progressive mesh", "dependent progressive transmission", "illumination effect", "quality improvement", "real time", "computer graphic", "wireless network" ], "authors": [ { "name": "Wei Guan", "org": "Nanyang Technological University, Singapore" }, { "name": "Juyong Zhang", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" } ], "venue": "GRAPHITE", "year": 2007 }, "PCZyvEp1": { "id": "PCZyvEp1", "title": "Accurate and Efficient Approximation of Clothoids Using B zier Curves for Path Planning", "abstract": "An accurate and efficient clothoid approximation approach is presented in this paper using Bézier curves based on the minimization of curvature profile difference. Compared with existing methods, the proposed approach is able to guarantee higher order geometric continuity with smaller approximation error in terms of position, orientation, and curvature. The approximation scheme takes place in thre...", "keywords": [ "Iron", "Optimization", "Mobile robots", "Windings", "Fresnel reflection", "Shape" ], "authors": [ { "name": "Yong Chen", "org": "Institute for Media Innovation, and School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore" }, { "name": "Yiyu Cai", "org": "Institute for Media Innovation, and School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Institute for Media Innovation, and School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore" }, { "name": "Daniel Thalmann", "org": "Institute for Media Innovation, and School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore" } ], "venue": "IEEE Transactions on Robotics", "year": 2017 }, "m2qdiX6P": { "id": "m2qdiX6P", "title": "Globally Consistent Wrinkle-Aware Shading of Line Drawings.", "abstract": "Shading is a tedious process for artists involved in 2D cartoon and manga production given the volume of contents that the artists have to prepare regularly over tight schedule. While we can automate shading production with the presence of geometry, it is impractical for artists to model the geometry for every single drawing. In this work, we aim to automate shading generation by analyzing the loc...", "keywords": [ "Geometry", "Two dimensional displays", "Three-dimensional displays", "Shape", "Production", "Image reconstruction", "Optimization" ], "authors": [ { "name": "Pradeep Kumar Jayaraman", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore, Singapore" }, { "name": "Chi-Wing Fu", "org": "Department of Computer Science and Engineering, The Chinese University of Hong Kong, Sha Tin, Hong Kong" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore, Singapore" }, { "name": "Xueting Liu", "org": "Department of Computer Science and Engineering, The Chinese University of Hong Kong, Sha Tin, Hong Kong" }, { "name": "Tien-Tsin Wong", "org": "Department of Computer Science and Engineering, The Chinese University of Hong Kong, Sha Tin, Hong Kong" } ], "venue": "IEEE Transactions on Visualization and Computer Graphics", "year": 2018 }, "kFD5w7ig": { "id": "kFD5w7ig", "title": "Immersive protein gaming for bio edutainment", "abstract": "Games have long been used as a tool for teaching important subject matter, from concept building to problem solving.Through fun learning, students may further develop their curiosities and interest in their study. This article addresses the issue of learning biomolecular structures by virtual reality gaming. A bio edutainment solution featuring stereographic visualization, 3D modeling, and game interaction is developed for students to learn amino acids, αhelices, βsheets, and other protein structure information. A pilot study is performed in this work with Singapore Chinese High School; initial results of this study are presented.", "keywords": [ "game interaction", "pilot study", "initial result", "concept building", "biomolecular structure", "bio edutainment solution", "amino acid", "important subject matter", "singapore chinese high school", "fun learning", "immersive protein gaming", "biochemistry", "computer simulation", "protein structure", "biology", "games" ], "authors": [ { "name": "Yiyu Cai", "org": "Nanyang Technological University, Singapore" }, { "name": "Baifang Lu", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Lin Li", "org": "Nanyang Technological University, Singapore" } ], "venue": "Simulation and Gaming - Symposium: virtual reality simulation", "year": 2006 }, "t2kUIJ60": { "id": "t2kUIJ60", "title": "Natural and seamless image composition with color control.", "abstract": "While the state-of-the-art image composition algorithms subtly handle the object boundary to achieve seamless image copy-and-paste, it is observed that they are unable to preserve the color fidelity of the source object, often require quite an amount of user interactions, and often fail to achieve realism when there exists salient discrepancy between the background textures in the source and destination images. These observations motivate our research towards color controlled natural and seamless image composition with least user interactions. In particular, based on the Poisson image editing framework, we first propose a variational model that considers both the gradient constraint and the color fidelity. The proposed model allows users to control the coloring effect caused by gradient domain fusion. Second, to have less user interactions, we propose a distance-enhanced random walks algorithm, through which we avoid the necessity of accurate image segmentation while still able to highlight the foreground object. Third, we propose a multiresolution framework to perform image compositions at different subbands so as to separate the texture and color components to simultaneously achieve smooth texture transition and desired color control. The experimental results demonstrate that our proposed framework achieves better and more realistic results for images with salient background color or texture differences, while providing comparable results as the state-of-the-art algorithms for images without the need of preserving the object color fidelity and without significant background texture discrepancy.", "keywords": [ "poisson image editing.", "accurate image segmentation", "object color fidelity", "color control", "destination image", "salient background color", "color fidelity", "image copy-and-paste", "index terms—digital image editing", "image composition", "seamless image composition", "user interaction", "poisson image editing framework", "color component", "digital images", "digital image", "random walk", "partial differential equations", "cloning", "indexing terms", "image segmentation", "image texture", "computer science", "image resolution" ], "authors": [ { "name": "Wenxian Yang", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianfei Cai", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Susanto Rahardja", "org": "Institute for Inforcomm Research, Agency for Science Technology, and Research, Singapore" }, { "name": "Chang Wen Chen", "org": "Department of Computer Science and Engineering, University at Buffalo, State University of New York, Buffalo, NY" } ], "venue": "IEEE Transactions on Image Processing", "year": 2009 }, "61buligP": { "id": "61buligP", "title": "Triangular Bézier sub-surfaces on a triangular Bézier surface.", "abstract": "This paper considers the problem of computing the Bézier representation for a triangular sub-patch on a triangular Bézier surface. The triangular sub-patch is defined as a composition of the triangular surface and a domain surface that is also a triangular Bézier patch. Based on de Casteljau recursions and shifting operators, previous methods express the control points of the triangular sub-patch as linear combinations of the construction points that are constructed from the control points of the triangular Bézier surface. The construction points contain too many redundancies. This paper derives a simple explicit formula that computes the composite triangular sub-patch in terms of the blossoming points that correspond to distinct construction points and then an efficient algorithm is presented to calculate the control points of the sub-patch. © 2011 Elsevier B.V. All rights reserved.", "keywords": [ "composition", "shift operator" ], "authors": [ { "name": "Wenyu Chen", "org": "" }, { "name": "Rongdong Yu", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Yiyu Cai", "org": "" }, { "name": "Chikit Au", "org": "" } ], "venue": "J. Computational Applied Mathematics", "year": 2011 }, "bqMk8WbK": { "id": "bqMk8WbK", "title": "Design and development of a Virtual Dolphinarium for children with autism.", "abstract": "The recent proliferation of virtual reality (VR) technology applications in the autism therapy to promote learning and positive behavior among such children has produced optimistic results in developing a variety of skills and abilities in them. Dolphin-assisted therapy has also become a topic of public and research interest for autism intervention and treatment. This paper will present an innovat...", "keywords": [ "Autism", "Dolphins", "Pediatrics", "Visualization", "Media", "Educational institutions" ], "authors": [ { "name": "Yiyu Cai", "org": "Institute for Media Innovation, Nanyang Technological University (NTU), Singapore" }, { "name": "Noel K H Chia", "org": "National Institute of Education, Singapore" }, { "name": "Daniel Thalmann", "org": "Institute for Media Innovation, Nanyang Technological University (NTU), Singapore" }, { "name": "Norman K N Kee", "org": "National Institute of Education, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, NTU, Singapore" }, { "name": "Nadia M Thalmann", "org": "Institute for Media Innovation, Nanyang Technological University (NTU), Singapore" } ], "venue": "IEEE Transactions on Neural Systems and Rehabilitation Engineering", "year": 2013 }, "LCUC50t2": { "id": "LCUC50t2", "title": "Algebraic Methods for Computer Aided Geometric Design", "abstract": "", "keywords": [ "singularities", "inversion", "polar curves" ], "authors": [ { "name": "Thomas W. Sederberg", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Handbook of Computer Aided Geometric Design", "year": 2001 }, "X1bXeV7u": { "id": "X1bXeV7u", "title": "Birational quadrilateral maps.", "abstract": "A generic planar quadrilateral defines a 2:1 bilinear map. We show that by assigning an appropriate weight to one vertex of any planar quadrilateral, we can create a map whose inverse is rational linear. We show how to make a quad map be birational by assigning one control point weight.The weight is computed using a simple closed-form equation.For convex quads, the weight is positive and the pre-image is the [ 0 , 1 ] í¿ [ 0 , 1 ] domain.Any planar quad mesh can be made piecewise C 0 birational by using this method.", "keywords": [], "authors": [ { "name": "Thomas W. Sederberg", "org": "Department of Computer Science, Brigham Young University, Provo, UT 84602, USA" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore 639798, Singapore" } ], "venue": "Computer Aided Geometric Design", "year": 2015 }, "jLDVpBe7": { "id": "jLDVpBe7", "title": "Kinect-based non-intrusive human gait analysis and visualization", "abstract": "", "keywords": [], "authors": [ { "name": "Nguyen-Luc Dao", "org": "nanyang technological university" }, { "name": "Yuzhe Zhang", "org": "nanyang technological university" }, { "name": "Jianmin Zheng", "org": "nanyang technological university" }, { "name": "Jianfei Cai", "org": "nanyang technological university" } ], "venue": "Multimedia Signal Processing", "year": 2015 }, "d7wsLW2e": { "id": "d7wsLW2e", "title": "Photometric stereo using mesh face based optimization.", "abstract": "The state-of-the-art photometric stereo (PS) methods typically apply shading cues on each vertex and represent a vertex normal as a non-linear function of its neighboring vertices. Such vertex-based representation leads to huge computational cost and limits it from processing dense meshes. In this paper, we propose a PS based surface reconstruction using mesh face based representation. In particular, we propose to apply the shading cue on each mesh face instead of each vertex and optimize face normals instead of vertex normals. We develop a two-step approach to solve the surface recovery problem, where we first optimize face normals using shading cues and then update vertices by the optimized face normals. Experimental results show that, compared with the state-of-the-art, such a two-step approach is able to reduce the runtime significantly as well as handling much denser meshes.", "keywords": "", "authors": [ { "name": "Di Xu", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore 639798" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore 639798" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore 639798" }, { "name": "Juyong Zhang", "org": "University of Science and Technology of China, Hefei, Anhui, China 230026" } ], "venue": "VCIP", "year": 2016 }, "2dYyC9cU": { "id": "2dYyC9cU", "title": "Cloth Simulation and Virtual Try-on with Kinect Based on Human Body Adaptation", "abstract": "", "keywords": [], "authors": [ { "name": "yuzhe zhang", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" }, { "name": "nadia magnenatthalmann", "org": "nanyang technological university" } ], "venue": "", "year": 2014 }, "ZRHbLUVp": { "id": "ZRHbLUVp", "title": "A VR simulator for intracardiac intervention.", "abstract": "A VR simulator provides low-cost, realistic training for intracardiac techniques for determining the heart's mechanical and electrical activities. A geometric method models interaction between a catheter and the heart wall. Boundary-enhanced voxelization accelerates detection of catheter-heart interaction. A tactile interface incorporates a VR catheter unit to track the catheter's movement.", "keywords": [ "intracardiac technique", "heart wall", "catheter-heart interaction", "vr catheter unit", "boundary-enhanced voxelization", "tactile interface", "electrical activity", "intracardiac intervention", "realistic training", "vr simulator", "geometric method models interaction", "heart", "modeling", "cardiology", "surface reconstruction", "computer graphics", "simulator", "computational modeling", "virtual reality" ], "authors": [ { "name": "Patricia Chiang", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "You Yu", "org": "Nanyang Technological University" }, { "name": "Koon Hou Mak", "org": "Mak Heart Clinic" }, { "name": "Chee Kong Chui", "org": "National University of Singapore" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" } ], "venue": "IEEE Computer Graphics and Applications", "year": 2013 }, "ZAcwyHtV": { "id": "ZAcwyHtV", "title": "Shading-Based Surface Recovery Using Subdivision-Based Representation: Surface Recovery Using Subdivision-based Representation", "abstract": "", "keywords": "", "authors": [ { "name": "Teng Deng", "org": "Nanyang Technological UniversitySingapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological UniversitySingapore" }, { "name": "Jianfei Cai", "org": "Nanyang Technological UniversitySingapore" }, { "name": "Tat-Jen Cham", "org": "Nanyang Technological UniversitySingapore" } ], "venue": "Computer Graphics Forum", "year": 2018 }, "EdVyAD9f": { "id": "EdVyAD9f", "title": "Automatic re-planning of lifting paths for robotized tower cranes in dynamic BIM environments", "abstract": "Abstract Computer-Aided Lift Planning (CALP) systems provide smart and optimal solutions for automatic crane lifting, supported by intelligent decision-making and planning algorithms along with computer graphics and simulations. Re-planning collision-free optimal lifting paths in near real-time is an essential feature for a robotized crane operating in a construction environment that is changing with time. The primary focus of the present research work is to develop a re-planning module for the CALP system designed at Nanyang Technological University. The CALP system employs GPU-based parallelization approach for discrete and continuous collision detection as well as for path planning. Building Information Modeling (BIM) is utilized in the system, and a Single-level Depth Map (SDM) representation is implemented to reduce the huge data set of BIM models for usage in discrete and continuous collision detection. The proposed re-planning module constitutes of a Decision Support System (DSS) and a Path Re-planner (PRP). A novel re-planning decision making algorithm using multi-level Oriented Bounding Boxes (OBBs) is formulated for the DSS. A path re-planning strategy via updating the start configuration for the local path is devised for the PRP. Two case studies are carried out with real-world models of a building and a specific tower crane to validate the effective performance of the re-planning module. The results show excellent decision accuracy and near real-time re-planning with high optimality.", "keywords": "", "authors": [ { "name": "Souravik Dutta", "org": "Interdisciplinary Graduate School, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore" }, { "name": "Yiyu Cai", "org": "School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore" }, { "name": "Lihui Huang", "org": "School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore" } ], "venue": "Automation in Construction", "year": 2020 }, "D6mMhFYp": { "id": "D6mMhFYp", "title": "Approximate implicitization using monoid curves and surfaces", "abstract": " This paper presents an approach to #nding an approximate implicit equation and an approximate inversionmap of a planar rational parametric curve or a rational parametric surface. High accuracy of theapproximation is achieved with a relatively small number of low-degree curve segments or surface patches.By using monoid curves and surfaces, the method eliminates the undesirable singularities and #phantom"branches, normally associated with implicit representation. The monoids are expressed in... ", "keywords": [ "implicitization", "monoid curve", "approximation", "inversion map", "monoid", "approximate implicitization", "parametric surface", "parametric curve" ], "authors": [ { "name": "Thomas W. Sederberg", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Kris Klimaszewski", "org": "" }, { "name": "Tor Dokken", "org": "" } ], "venue": "Graphical Models and Image Processing", "year": 1999 }, "ZT8IlM2h": { "id": "ZT8IlM2h", "title": "Euler arc splines for curve completion.", "abstract": "This paper introduces a special arc spline called an Euler arc spline as the basic form for visually pleasing completion curves. It is considered as an extension of an Euler curve in the sense that the points in the Euler curve are replaced by arcs. A simple way for specifying it, which is suitable for shape completion, is presented. It is shown that Euler arc splines have several properties desired by aesthetics of curves, in addition to computational simplicity and NURBS representation. An algorithm is proposed for curve completion using Euler arc splines. The development of the algorithm involves two optimization processes, which are converted into a single minimization problem in two variables solved by the Levenberg-Marquardt algorithm. Compared to previous methods, the proposed algorithm always guarantees the interpolation of two boundary conditions. © 2012 Elsevier Ltd.", "keywords": [ "Aesthetical curves", "Arc spline", "Euler curves", "Shape completion" ], "authors": [ { "name": "Hailing Zhou", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Xunnian Yang", "org": "" } ], "venue": "Computers & Graphics", "year": 2012 }, "XxQUHMmO": { "id": "XxQUHMmO", "title": "Enhancing Sketching and Sculpting for Shape Modeling.", "abstract": "Sketch-based modeling uses freeform strokes as basic modeling metaphor and provides an intuitive way for shape modeling, for instance, for cyberworlds. This paper presents a new method to enhance sketch-based modeling. The core idea of the method is to enhance the sketching process by allowing the user to iteratively sketch to progressively create initial shapes that interpolate the sketched strokes. This process considers all the sketches and the up-to-date constructed 3D shape, which enables the user to be aware of the shape of the sketched model. The key underlying technique that supports this process is a novel surface construction algorithm, which generates 3D triangular mesh models with gradual shape changes during iterative sketching. Experiments demonstrate that the presented method can allow users to intuitively and flexibly create and edit 3D models even with complex topology, which is usually difficult in existing sketch-based modeling systems.", "keywords": "", "authors": [ { "name": "Kai Wang", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Hock Soon Seah", "org": "" } ], "venue": "CW", "year": 2018 }, "KgY0DPqU": { "id": "KgY0DPqU", "title": "Making Doo-Sabin surface interpolation always work over irregular meshes", "abstract": "This paper presents a reliable method for constructing a control mesh whose Doo-Sabin subdivision surface interpolates the vertices of a given mesh with arbitrary topology. The method improves on existing techniques in two respects: (1) it is guaranteed to always work for meshes of arbitrary topological type; (2) there is no need to solve a system of linear equations to obtain the control points. Extensions to include normal vector interpolation and/or shape adjustment are also discussed.", "keywords": [ "arbitrary topology · subdivision surfaces · interpolation · normal condition · shape control", "subdivision surface", "linear equations" ], "authors": [ { "name": "Jianmin Zheng", "org": "School of Computer Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798" }, { "name": "Yiyu Cai", "org": "School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798" } ], "venue": "The Visual Computer", "year": 2005 }, "25iQ0CF4": { "id": "25iQ0CF4", "title": "Learning Activity System Design for Autistic Children Using Virtual Pink Dolphins", "abstract": "", "keywords": [], "authors": [ { "name": "noel kok hwee chia", "org": "nanyang technological university" }, { "name": "yiyu cai", "org": "nanyang technological university" }, { "name": "norman kiak nam kee", "org": "nanyang technological university" }, { "name": "nadia magnenat thalmann", "org": "nanyang technological university" }, { "name": "bianyue yang", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" }, { "name": "daniel thalmann", "org": "nanyang technological university" } ], "venue": "", "year": 2013 }, "kJ7gHAxo": { "id": "kJ7gHAxo", "title": "Conversion between T-Splines and Hierarchical B-Splines", "abstract": "T-splines is a recently developed surface modelling tech- nique which is a generalization of B-splines and allows true local refinement. Another well established method support- ing local refinement is hierarchical B-splines. This paper presents algorithms for transformation between T-splines and hierarchical (rational) B-splines. With the transform a- tion, a surface expressed in terms of T-splines can be con- verted into a hierarchical (rational) B-spline representa tion and vice versa. The correspondence between T-spline rep- resentation and hierarchical (rational) B-spline represe nta- tion is generally not one-to-one. Our conversion algorithms can yield compact representations.", "keywords": [ "surface representation", "local refinement.", "t-splines", "surface modelling", "hierarchical b- splines", "developable surface" ], "authors": [ { "name": "Yimin Wang", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Hock Soon Seah", "org": "Nanyang Technological University" } ], "venue": "Computer Graphics and Imaging", "year": 2005 }, "0nBL0NZK": { "id": "0nBL0NZK", "title": "Variational reconstruction using subdivision surfaces with continuous sharpness control.", "abstract": "We present a variational method for subdivision surface reconstruction from a noisy dense mesh. A new set of subdivision rules with continuous sharpness control is introduced into Loop subdivision for better modeling subdivision surface features such as semi-sharp creases, creases, and corners. The key idea is to assign a sharpness value to each edge of the control mesh to continuously control the surface features. Based on the new subdivision rules, a variational model with L1 norm is formulated to find the control mesh and the corresponding sharpness values of the subdivision surface that best fits the input mesh. An iterative solver based on the augmented Lagrangian method and particle swarm optimization is used to solve the resulting non-linear, non-differentiable optimization problem. Our experimental results show that our method can handle meshes well with sharp/semi-sharp features and noise.", "keywords": [ "variational model", " subdivision surface", " sharpness", " surface reconstruction", " L1norm" ], "authors": [ { "name": "Xiaoqun Wu", "org": "Beijing Technology and Business University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" }, { "name": "Haisheng Li", "org": "Beijing Technology and Business University" } ], "venue": "Computational Visual Media", "year": 2017 }, "Mae5tn3N": { "id": "Mae5tn3N", "title": "Collision Detection Using Axis Aligned Bounding Boxes", "abstract": "", "keywords": [], "authors": [ { "name": "panpan cai", "org": "nanyang technological university" }, { "name": "c indhumathi", "org": "nanyang technological university" }, { "name": "yiyu cai", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" }, { "name": "yi gong", "org": "pakistan engineering council" }, { "name": "teng sam lim", "org": "pakistan engineering council" }, { "name": "peng wong", "org": "pakistan engineering council" } ], "venue": "", "year": 2014 }, "n2kMlfXl": { "id": "n2kMlfXl", "title": "Alive Caricature from 2D to 3D.", "abstract": "Caricature is an art form that expresses subjects in abstract, simple and exaggerated views. While many caricatures are 2D images, this paper presents an algorithm for creating expressive 3D caricatures from 2D caricature images with minimum user interaction. The key idea of our approach is to introduce an intrinsic deformation representation that has the capability of extrapolation, enabling us to create a deformation space from standard face datasets, which maintains face constraints and meanwhile is sufficiently large for producing exaggerated face models. Built upon the proposed deformation representation, an optimization model is formulated to find the 3D caricature that captures the style of the 2D caricature image automatically. The experiments show that our approach has better capability in expressing caricatures than those fitting approaches directly using classical parametric face models such as 3DMM and FaceWareHouse. Moreover, our approach is based on standard face datasets and avoids constructing complicated 3D caricature training sets, which provides great flexibility in real applications.", "keywords": "", "authors": [ { "name": "Qianyi Wu", "org": "Univ. of Science and Technology of China" }, { "name": "Juyong Zhang", "org": "Univ. of Science and Technology of China" }, { "name": "Yu-Kun Lai", "org": "Cardiff Univ." }, { "name": "Jianmin Zheng", "org": "Nanyang Technological Univ." }, { "name": "Jianfei Cai", "org": "Nanyang Technological University" } ], "venue": "CVPR", "year": 2018 }, "nePP6PmT": { "id": "nePP6PmT", "title": "Geometric characteristics of a class of cubic curves with rational offsets", "abstract": "Planar Bézier curves that have rationally parameterized offsets can be classified into two classes. The first class is composed of curves that have Pythagorean hodographs (PH) and the second class is composed of curves that do not have PHs but can have rational PHs after reparameterization by a fractional quadratic transformation. This paper reveals a geometric characterization for all properly-parameterized cubic Bézier curves in the second class. The characterization is given in terms of Bézier control polygon geometry. Based on the derived conditions, we also present a simple geometric construction of G 1 Hermite interpolation using such Béziercurves. The construction results in a one-parameter family of curves if a solution exists. We further prove that there exists a unique value of the parameter which minimizes the integral of the squared norm of the second order derivative of the curves. This paper presents a geometric characterization of cubic indirect-PH curves.We give a construction of G 1 Hermite interpolation using indirect-PH curves.The optimal indirect-PH curve to G 1 Hermite interpolation is investigated.", "keywords": [ "offsets", "bezier curves" ], "authors": [ { "name": "Xing-Jiang Lu", "org": "Mathematics Department, Zhejiang University, Hangzhou 310027, China" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Yiyu Cai", "org": "School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Gang Zhao", "org": "School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China" } ], "venue": "Computer-Aided Design", "year": 2016 }, "vFM0wP0J": { "id": "vFM0wP0J", "title": "CT volumetry of the liver: where does it stand in clinical practice?", "abstract": "Imaging-based volumetry has been increasingly utilised in current clinical practice to obtain accurate measurements of the liver volume. This is particularly useful prior to major hepatic resection and living donor liver transplantation where the size of the remnant liver and liver graft, respectively, affects procedural success and postoperative mortality and morbidity. The use of imaging-based volumetry, with emphasis on computed tomography, will be reviewed. We will explore the various technical factors that contribute to accurate volumetric measurements, and demonstrate how the accuracies of these techniques are influenced by their methodologies. The strengths and limitations of using anatomical imaging to estimate liver volume will be discussed, in relation to laboratory and functional imaging methods of assessment.", "keywords": [], "authors": [ { "name": "M C Lim", "org": "Department of Diagnostic Radiology, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore 308433, Singapore." }, { "name": "C H Tan", "org": "Department of Diagnostic Radiology, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore 308433, Singapore." }, { "name": "J Cai", "org": "School of Computer Engineering, Nanyang Technological University, Block N4 Nanyang Avenue #02a-32, Singapore 639798, Singapore." }, { "name": "J Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Block N4 Nanyang Avenue #02a-32, Singapore 639798, Singapore." }, { "name": "A W C Kow", "org": "University Surgical Cluster, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074, Singapore." } ], "venue": "Clinical radiology", "year": 2014 }, "ljwC0QPT": { "id": "ljwC0QPT", "title": "Control point removal algorithm for t-spline surfaces", "abstract": "This paper discusses the problem of removing control points from a T-spline control grid while keeping the surface unchanged. An algorithm is proposed to detect whether a specified control point can be removed or not and to compute the new control points if the point is removable. The algorithm can be viewed as a reverse process of the T-spline local knot insertion algorithm. The extension of the algorithm to remove more control points is also discussed.", "keywords": [ "control point removal algorithm", "t-spline control grid", "t-spline local knot insertion", "reverse process", "control point", "t-spline surface", "specified control point", "new control point" ], "authors": [ { "name": "Yimin Wang", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" } ], "venue": "GMP", "year": 2006 }, "rw7pjR6N": { "id": "rw7pjR6N", "title": "Interpolation over arbitrary topology meshes using a two-phase subdivision scheme.", "abstract": "The construction of a smooth surface interpolating a mesh of arbitrary topological type is an important problem in many graphics applications. This paper presents a two-phase process, based on a topological modification of the control mesh and a subsequent Catmull-Clark subdivision, to construct a smooth surface that interpolates some or all of the vertices of a mesh with arbitrary topology. It is also possible to constrain the surface to have specified tangent planes at an arbitrary subset of the vertices to be interpolated. The method has the following features: 1) It is guaranteed to always work and the computation is numerically stable, 2) there is no need to solve a system of linear equations and the whole computation complexity is O(K) where K is the number of the vertices, and 3) each vertex can be associated with a scalar shape handle for local shape control. These features make interpolation using Catmull-Clark surfaces simple and, thus, make the new method itself suitable for interactive free-form shape design.", "keywords": [ "arbitrary subset", "and object representations", "shape control", "scalar shape", "interactive free-form shape design", "surface", "curve", "solid", "computer-aided engineering", "local shape control", "interpolation", "control mesh", "i.3.5 compu-", "subsequent catmull-clark subdivision", "mesh generation", "computer graphics", "smooth surface", "surface fitting", "computational geometry", "index terms— i.3 computer graphics", "computational complexity", "smooth surface construction", "computer-aided design.", "arbitrary topology", "arbitrary topological type", "topology", "two-phase subdivision scheme", "computational geometry and object modeling", "solid modelling", "topology mesh", "tangent plane", "splines (mathematics)", "catmull-clark subdivision", "new method", "indexing terms", "computer graphic", "linear equations", "computer aided design" ], "authors": [ { "name": "Jianmin Zheng", "org": "" }, { "name": "Yiyu Cai", "org": "" } ], "venue": "IEEE Trans. Vis. Comput. Graph.", "year": 2006 }, "QqB3vOBQ": { "id": "QqB3vOBQ", "title": "Vector field fitting for real-time environment matting of transparent objects", "abstract": "The major drawback of real-time environment matting method is that the extracted environment matte data often contains significant amount of noise and errors. Although some filtering methods have been employed to remove the noise and obtain acceptable composition results, they are incapable of removing potential errors. In this paper, we first establish a light motion field to better describe the environmental matting effect of transparent objects and propose a new vector field fitting algorithm to simultaneously remove both noise and errors in the extracted matte data by using energy minimization approach. Experimental results show that our method is less sensitive to noise and error and can generate perceptually better composition results than the existing real-time environment matting approaches.", "keywords": [ "image processing", "knowledge acquisition", "real-time systems", "energy minimization approach", "extracted environment", "filtering methods", "light motion field", "real-time environment matting", "transparent objects", "vector field fitting algorithm", "Environment matting", "Light motion field", "Transparent objects", "Vector field fitting" ], "authors": [ { "name": "Duan, Q.", "org": "Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore, Singapore|c|" }, { "name": "Jianfei Cai", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" } ], "venue": "Image Processing", "year": 2009 }, "jWIZSfww": { "id": "jWIZSfww", "title": "Constrained active contours for boundary refinement in interactive image segmentation.", "abstract": "", "keywords": [ "color", "image segmentation", "geometry", "computational geometry" ], "authors": [ { "name": "Nguyen Thi Nhat Anh", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Juyong Zhang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "ISCAS", "year": 2012 }, "vsiX1FEB": { "id": "vsiX1FEB", "title": "Tubular triangular mesh parameterization and applications", "abstract": "Triangular meshes are a popular geometric representation for 3D models used in computer graphics. Parameterization is a process that establishes a mapping between the surface of a model and a suitable domain. This paper considers the problem of parameterizing triangular meshes that have tubular shapes. Unlike an open mesh that is of plane topological type, a tubular mesh gives rise to some special issues in parameterization due to its mesh structure. This paper presents an edge-based parameterization method, in which the edges rather than the vertices of the mesh are treated as the target for parameterization. It first parameterizes the edges on the two boundaries of the tubular mesh, then parameterizes the internal edges based on the mean value coordinates, and finally computes the parameters of the mesh vertices. The method does not need cutting of the mesh. It improves conventional cutting-based algorithms, which cut the mesh to make it a disk topologically, and overcomes the problems of cutting paths that are the zigzag paths leading to suboptimal parameterizations and the difficulty in finding good cutting paths. Some applications such as surface fitting and texture mapping are also provided. Copyright © 2009 John Wiley & Sons, Ltd. This paper presents an edge-based method for parameterizing tubular triangular meshes, in which the edges rather than the vertices of the mesh are treated as the target for parameterization. The method does not need cutting of the mesh and thus overcomes some problems existing in conventional cutting-based algorithms.", "keywords": [ "triangular mesh", "parameterization", "texture mapping" ], "authors": [ { "name": "Yimin Wang", "org": "School of Computer Engineering, Nanyang Technological University, Block N4, Nanyang Avenue, Singapore 639798." }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Journal of Visualization and Computer Animation", "year": 2010 }, "D3YgvA6E": { "id": "D3YgvA6E", "title": "Surface skinning using periodic T-spline in semi-NURBS form.", "abstract": "", "keywords": [], "authors": [ { "name": "Yusha Li", "org": "" }, { "name": "Wenyu Chen", "org": "" }, { "name": "Yiyu Cai", "org": "" }, { "name": "Ahmad H. Nasri", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "J. Computational Applied Mathematics", "year": 2015 }, "nCpwYm4D": { "id": "nCpwYm4D", "title": "Disentangled Human Body Embedding Based on Deep Hierarchical Neural Network.", "abstract": "Human bodies exhibit various shapes for different identities or poses, but the body shape has certain similarities in structure and thus can be embedded in a low-dimensional space. This article presents an autoencoder-like network architecture to learn disentangled shape and pose embedding specifically for the 3D human body. This is inspired by recent progress of deformation-based latent representation learning. To improve the reconstruction accuracy, we propose a hierarchical reconstruction pipeline for the disentangling process and construct a large dataset of human body models with consistent connectivity for the learning of the neural network. Our learned embedding can not only achieve superior reconstruction accuracy but also provide great flexibility in 3D human body generation via interpolation, bilinear interpolation, and latent space sampling. The results from extensive experiments demonstrate the powerfulness of our learned 3D human body embedding in various applications.", "keywords": [ "Shape", "Strain", "Three-dimensional displays", "Biological system modeling", "Computational modeling", "Solid modeling", "Face" ], "authors": [ { "name": "Boyi Jiang", "org": "School of Mathematical Sciences, University of Science and Technology of China, Hefei, Anhui, China" }, { "name": "Juyong Zhang", "org": "School of Mathematical Sciences, University of Science and Technology of China, Hefei, Anhui, China" }, { "name": "Jianfei Cai", "org": "Faculty of IT, Monash University, Clayton, VIC, Australia" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore, Singapore" } ], "venue": "IEEE Transactions on Visualization and Computer Graphics", "year": 2020 }, "51EBdqsf": { "id": "51EBdqsf", "title": "Real-time 3D Face-Eye Performance Capture of a Person Wearing VR Headset.", "abstract": "Teleconference or telepresence based on virtual reality (VR) head-mount display (HMD) device is a very interesting and promising application since HMD can provide immersive feelings for users. However, in order to facilitate face-to-face communications for HMD users, real-time 3D facial performance capture of a person wearing HMD is needed, which is a very challenging task due to the large occlusion caused by HMD. The existing limited solutions are very complex either in setting or in approach as well as lacking the performance capture of 3D eye gaze movement. In this paper, we propose a convolutional neural network (CNN) based solution for real-time 3D face-eye performance capture of HMD users without complex modification to devices. To address the issue of lacking training data, we generate massive pairs of HMD face-label dataset by data synthesis as well as collecting VR-IR eye dataset from multiple subjects. Then, we train a dense-fitting network for facial region and an eye gaze network to regress 3D eye model parameters. Extensive experimental results demonstrate that our system can efficiently and effectively produce in real time a vivid personalized 3D avatar with the correct identity, pose, expression and eye motion corresponding to the HMD user.\n\n", "keywords": "", "authors": [ { "name": "Guoxian Song", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Tat-Jen Cham", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Juyong Zhang", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Henry Fuchs", "org": "University of North Carolina at Chapel Hill, Chapel Hill, NC, USA" } ], "venue": "MM '18: ACM Multimedia Conference\n\t\t Seoul\n\t\t Republic of Korea\n\t\t October, 2018", "year": 2018 }, "dtmf6wDE": { "id": "dtmf6wDE", "title": "An architecture of a VR simulation system for cardiac intervention", "abstract": "Cardiovascular diseases account for a major cause of deaths in many developed countries. To treat cardiovascular diseases, cardiac minimally intervention is widely used as an effective yet complicated solution. Training of cardiac intervention is thus playing a crucial role. This paper addresses the use of Virtual Reality (VR) technology for the simulated training of cardiac intervention. In particular, the paper describes the architecture of a VR simulation system for cardiac intervention focusing on VR hardware, software and methodology is used in As an enabling technology, Graphics Processing Unit (GPU) is applied in this work to enhance cardiac modeling, cardiac visualization, and cardiac interactive simulation with the VR simulation environment.", "keywords": [ "enabling technology", "cardiovascular disease", "vr hardware", "cardiac visualization", "vr simulation environment", "cardiac intervention", "vr simulation system", "cardiac minimally intervention", "cardiac modeling", "cardiac interactive simulation", "cause of death", "architecture", "virtual reality", "developing country" ], "authors": [ { "name": "Rongdong Yu", "org": "Zhejiang University" }, { "name": "Xiuzi Ye", "org": "Zhejiang University" }, { "name": "Sanyuan Zhang", "org": "Zhejiang University" }, { "name": "Yin Zhang", "org": "Zhejiang University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Wenyu Chen", "org": "Nanyang Technological University" }, { "name": "Patricia Chiang", "org": "Nanyang Technological University" }, { "name": "Mon Hnin Tun", "org": "Nanyang Technological University" } ], "venue": "VRCAI", "year": 2008 }, "0Sry2qvE": { "id": "0Sry2qvE", "title": "A computational approach to joint line detection on triangular meshes", "abstract": "In this paper, we present formulae for evaluating differential quantities at vertices of triangular meshes that may approximate potential piecewise smooth surfaces with discontinuous normals or discontinuous curvatures at the joint lines. We also define the C (1) and C (2) discontinuity measures for surface meshes using changing rates of one-sided curvatures or changing rates of curvatures across mesh edges. The curvatures are computed discretely as of local interpolating surfaces that lie within a tolerance to the mesh. Together with proper estimation of local shape parameters, the obtained discontinuity measures own properties like sensitivity to salient joint lines and being scale invariant. A simple algorithm is finally developed for detection of C (1) or C (2) discontinuity joint lines on triangular meshes with even highly non-uniform triangulations. Several examples are provided to demonstrate the effectiveness of the proposed method.", "keywords": [ "Discrete differential geometry", "Triangle meshes", "Discontinuity measures", "Joint line detection" ], "authors": [ { "name": "jianmin zheng", "org": "Zhejiang Univ, Dept Math, Hangzhou 310003, Zhejiang, Peoples R China" }, { "name": "desheng wang", "org": "Nanyang Technol Univ, Sch Comp Engn, Singapore 639798, Singapore" }, { "name": "xunnian yang", "org": "Nanyang Technol Univ, Div Math, SPMS, Singapore 639798, Singapore" } ], "venue": "ENGINEERING WITH COMPUTERS", "year": 2014 }, "yd9qJdz2": { "id": "yd9qJdz2", "title": "Shading-Based Surface Recovery Using Subdivision-Based Representation.", "abstract": "", "keywords": "", "authors": [ { "name": "Teng Deng", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Tat-Jen Cham", "org": "" } ], "venue": "Comput. Graph. Forum", "year": 2019 }, "QSu2uKMg": { "id": "QSu2uKMg", "title": "An image processing approach to feature-preserving B-spline surface fairing.", "abstract": "Abstract Reverse engineering of 3D industrial objects such as automobiles and electric appliances is typically performed by fitting B-spline surfaces to scanned point cloud data with a fairing term to ensure smoothness, which often smooths out sharp features. This paper proposes a radically different approach to constructing fair B-spline surfaces, which consists of fitting a surface without a fairing term to capture sharp edges, smoothing the normal field of the constructed surface with feature preservation, and reconstructing the B-spline surface from the smoothed normal field. The core of our method is an image processing based feature-preserving normal field fairing technique. This is inspired by the success of many recent research works on the use of normal field for reconstructing mesh models, and makes use of the impressive simplicity and effectiveness of bilateral-like filtering for image denoising. In particular, our approach adaptively partitions the B-spline surface into a set of segments such that each segment has approximately uniform parameterization, generates an image from each segment in the parameter space whose pixel values are the normal vectors of the surface, and then applies a bilateral filter in the parameter domain to fair the normal field. As a result, our approach inherits the advantages of image bilateral filtering techniques and is able to effectively smooth B-spline surfaces with feature preservation as demonstrated by various examples.", "keywords": "", "authors": [ { "name": "Taro Kawasaki", "org": "Department of Mechanical Engineering, Yokohama National University, Japan" }, { "name": "Pradeep Kumar Jayaraman", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore" }, { "name": "Kentaro Shida", "org": "Armonicos Co., Ltd., Japan" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore" }, { "name": "Takashi Maekawa", "org": "Department of Mechanical Engineering, Yokohama National University, Japan" } ], "venue": "Computer-Aided Design", "year": 2018 }, "d4t7sqWD": { "id": "d4t7sqWD", "title": "VR bio X games", "abstract": "Many students voluntarily seek out challenges while playing computer games. Such high engagement is desirable in school education. We are interested in exploring VR-based game technology for educational use. This paper reports a VR game project for bio-molecular learning. Specifically, extreme game concepts are applied in biological context aiming to create a new biological learning experience on protein structure for secondary or primary students. With the aid of immersive visualization, VR interface and game-based interaction, this learning through gaming solution can help to introduce concepts of bio-molecular structures in classrooms or science museums. Through gaming, students can have better ideas about bio-molecular structure at different levels.", "keywords": [ "molecular structure", "protein structure" ], "authors": [ { "name": "Yiyu Cai", "org": "School of Mechanical & Aerospace Engineering and Bio-Informatics Research Center, Nanyang Technological University, Republic of Singapore, Singapore" }, { "name": "Chandrasekaran Indhumathi", "org": "School of Mechanical & Aerospace Engineering and Bio-Informatics Research Center, Nanyang Technological University, Republic of Singapore, Singapore" }, { "name": "W. Y. Chen", "org": "School of Mechanical & Aerospace Engineering and Bio-Informatics Research Center, Nanyang Technological University, Republic of Singapore, Singapore" }, { "name": "J. M. Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Republic of Singapore, Singapore" } ], "venue": "T. Edutainment", "year": 2008 }, "JrrvUiXU": { "id": "JrrvUiXU", "title": "Inversion Free and Topology Compatible Tetrahedral Mesh Warping Driven by Boundary Surface Deformation", "abstract": "Warping a tetrahedral mesh driven by boundary surface deformation is useful in many applications. Although some methods have been developed to transform the mesh to conform to the deformed boundary surface, it is still a challenging problem to construct an inversion free warped mesh maintaining a compatible topology. In this paper, these two problems are solved by a novel method that combines radial basis function (RBF)-based warping and adaptive mesh refinement. We iteratively transform the mesh using RBF-based warping with a safe step size to ensure that no element is inverted. The use of the RBF-based warping ensures a smooth warping and thus generates a high-quality warped volumetric mesh. To avoid too small step sizes, we refine the elements that are potentially inverted. The refinement is performed on the original and the warped meshes in the same way so as to maintain compatible topology between them. The results of our method can be used in many areas such as finite element simulation and shape interpolation. We demonstrate the effectiveness of our method with a set of examples.", "keywords": [ "radial basis function-based warping", "warping driven", "inversion free tetrahedral mesh warping", "shape interpolation", "finite element simulation", "novel method", "rbf-based mapping", "compatible topology", "boundary surface", "rbf-based warping", "mesh generation", "topology compatible tetrahedral mesh", "boundary surface deformation", "tetrahedral mesh", "adaptive mesh refinement", "smooth warping", "topology", "warped mesh", "inversion-free mesh", "inversion free warped mesh", "warped volumetric mesh", "adaptive refinement", "inversion free", "topology compatible tetrahedral mesh warping", "high-quality warped volumetric mesh", "silicon", "solid modeling", "design automation", "trajectory", "computational modeling" ], "authors": [ { "name": "Wenjing Zhang", "org": "" }, { "name": "Yuewen Ma", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "CAD/Graphics", "year": 2013 }, "hifoRwve": { "id": "hifoRwve", "title": "The Making of a 3D-Printed, Cable-Driven, Single-Model, Lightweight Humanoid Robotic Hand.", "abstract": "Dexterity robotic hands can (Cummings, 1996) greatly enhance the functionality of humanoid robots, but the making of such hands with not only human-like appearance but also the capability of performing the natural movement of social robots is a challenging problem. The first challenge is to create the hand’s articulated structure and the second challenge is to actuate it to move like a human hand. A robotic hand for humanoid robot should look and behave human-like. At the same time, it also needs to be light and cheap for widely-used purposes. We start with studying the biomechanical features of a human hand and propose a simplified mechanical model of robotic hands, which can achieve the important local motions of the hand. Then we use 3D modelling techniques to create a single interlocked hand model that integrates pin and ball joints to our hand model. Compared to other robotic hands, our design saves the time required for assembling and adjusting, which makes our robotic hand ready-to-use right after the 3D printing is completed. Finally, the actuation of the hand is realised by cables and motors. Based on this approach, we have designed a cost-effective, 3D printable, compact and lightweight robotic hand. Our robotic hand weighs 150 grams, has 15 joints which are similar to a real human hand and six Degree of Freedoms (DOFs). It is actuated by only six small size actuators. The wrist connecting part is also integrated into the hand model and could be customized for different robots such as Nadine robot(Magnenat Thalmann, Tian, u0026 Yao, 2017). The compact servo bed can be hidden inside the Nadine robot’s sleeve and the whole robotic hand platform will not cause extra load to her arm as the total weight (150 grams robotic hand and 162 grams artificial skin) is almost the same as her previous unarticulated robotic hand which is 348 grams. The paper also shows our test results with and without silicon artificial hand skin, and on Nadine robot.", "keywords": "", "authors": [ { "name": "Li Tian", "org": "Nanyang Technological University (NTU), Singapore" }, { "name": "Nadia Magnenat-Thalmann", "org": "Nanyang Technological University (NTU), Singapore" }, { "name": "Daniel Thalmann", "org": "École Polytechnique Fédérale de Lausanne, Switzerland" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University (NTU), Singapore" } ], "venue": "Front. Robotics and AI", "year": 2017 }, "6jexh63e": { "id": "6jexh63e", "title": "Learning molecular biology by VR playing", "abstract": "Learning by playing is one of the natural way for knowledge and skill acquisition. This paper addresses the issue of learning molecular biology by Virtual Reality (VR) based playing. A software system MolecularStudio is developed using the VR Technology for learning of protein structure. The paper also reports an experiment with a group of seven volunteer secondary students learning bio-molecule using the MolecularStudio.", "keywords": [ "virtual reality", "skill acquisition", "software systems", "protein structure", "biology", "molecular biology", "playing" ], "authors": [ { "name": "B. F. Lu", "org": "Nanyang Technological University, Singapore" }, { "name": "K. T. Lim", "org": "Nanyang Technological University, Singapore" }, { "name": "J. M. Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Y. Y. Cai", "org": "Nanyang Technological University, Singapore" } ], "venue": "VRCAI", "year": 2004 }, "muolQl9N": { "id": "muolQl9N", "title": "Compressive environment matting", "abstract": "The existing high-quality environment matting methods usually require the capturing of a few thousand sample images and spend a few hours in data acquisition. In this paper, a novel environment matting algorithm is proposed to capture and extract the environment matte data effectively and efficiently. First, the recently developed compressive sensing theory is incorporated to reformulate the environment matting problem and simplify the data acquisition process. Next, taking into account the special properties of light refraction and reflection effects of transparent objects, two advanced priors, group clustering and Gaussian priors, as well as other basic constraints are introduced during the matte data recovery process to combat with the limited image samples, suppress the effects of the measurement noise resulted from data acquisition, and faithfully recover the sparse environment matte data. Compared with most of the existing environment matting methods, our algorithm significantly simplifies and accelerates the environment matting extraction process while still achieving high-accurate composition results.", "keywords": [ "Picture/image generation", " Modeling and recovery of physical attributes" ], "authors": [ { "name": "qi duan", "org": "nanyang technological university" }, { "name": "jianfei cai", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" } ], "venue": "The Visual Computer: International Journal of Computer Graphics", "year": 2014 }, "vu2z32Z2": { "id": "vu2z32Z2", "title": "T-spline simplification and local refinement", "abstract": "A typical NURBS surface model has a large percentage of superfluous control points that significantly interfere with the design process. This paper presents an algorithm for eliminating such superfluous control points, producing a T-spline. The algorithm can remove substantially more control points than competing methods such as B-spline wavelet decomposition. The paper also presents a new T-spline local refinement algorithm and answers two fundamental open questions on T-spline theory.\n\n", "keywords": [ "NURBS surfaces", "T-splines", "knot removal", "local refinement", "subdivision surfaces" ], "authors": [ { "name": "Thomas W. Sederberg", "org": "Brigham Young University" }, { "name": "David L. Cardon", "org": "Brigham Young University" }, { "name": "G. Thomas Finnigan", "org": "Brigham Young University" }, { "name": "Nicholas S. North", "org": "Brigham Young University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Tom Lyche", "org": "Oslo University" } ], "venue": "ACM Transactions on Graphics", "year": 2004 }, "tcXVfQmn": { "id": "tcXVfQmn", "title": "Proxy-driven free-form deformation by topology-adjustable control lattice", "abstract": "This paper presents a flexible free-form deformation (FFD) method that overcomes two limitations of many FFD methods: the cumbersome interface and the fixed topology of the control lattice. The novelty of the method mainly lies in two aspects: (1) a specifically-tailored T-spline volume with its local refinement is introduced to define the deformation space and construct the deformation tool, and (2) a proxy represented as a three-dimensional mesh close to the object to be deformed is constructed from the control lattice of the T-spline volume and is used to manipulate and drive the deformation. While the method inherits all the virtues of FFD such as C2 continuous local and global modifications, the proxy provides a much concise and intuitive interface for the user to edit the deformation in a way similar to cage-based deformations. Moreover, the method allows local topology changes of the proxy after …", "keywords": "", "authors": [ { "name": "Yuzhe Zhang", "org": "School of Computer Science and Engineering, Nanyang Technological University, SINGAPORE" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, SINGAPORE" }, { "name": "Yiyu Cai", "org": "School of Mechanical and Aerospace Engineering, Nanyang Technological University,Singapore," } ], "venue": "Comput. Graph.", "year": 2020 }, "iC1UgwA3": { "id": "iC1UgwA3", "title": "Adaptive T-spline surface approximation of triangular meshes", "abstract": "Digital 3D models represented by triangular meshes are now broadly available and they are becoming a new multimedia data type after sound, images and video. For many applications there is a need to convert such mesh models into spline surfaces. This paper describes an adaptive algorithm that automatically converts a triangular mesh into a T-spline surface based on optimization techniques. The key issues of the algorithm include the parameterization of input data points, the determination of topology of the T-spline surface, and the calculation of the least squares T-spline surface control points. Some examples are provided to demonstrate the efficiency of the algorithm.", "keywords": [ "least squares approximations", "mesh generation", "optimisation", "solid modelling", "splines (mathematics)", "surface fitting", "t-spline surface approximation", "digital 3d model", "least squares t-spline surface control point", "optimization technique", "triangular mesh", "least square" ], "authors": [ { "name": "Yimin Wang", "org": "Nanyang Technol. Univ., Singapore|c|" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Singapore", "year": 2007 }, "PP0DfKdc": { "id": "PP0DfKdc", "title": "Embedding QR codes onto B-spline surfaces for 3D printing.", "abstract": "Abstract Recent advance of Additive Manufacturing technologies allows us to manufacture various parts used in real-world products. Consequently, product tracking of such 3D printed parts is an important issue. Quick Response (QR) code which is a two-dimensional matrix barcode invented by Denso, a Japanese automotive industry, in 1994, can be used for this purpose. It can store more data than the 1D barcode in a smaller space, and using a smartphone as a scanner, one can directly visit a website where all the information of the parts is stored. However, QR codes require secondary procedures to add them to products and are also vulnerable to wear and tear. Moreover, QR codes cannot be added to freeform surfaces, but only to developable surfaces. In this paper we propose a novel technique to embed QR codes onto CAD models consisting of freeform surfaces represented by B-spline surfaces, which produces 3D QR codes. 3D QR codes work similar to 2D QR codes and can be read by existing QR scanners, but are designed by grooving the surface to obtain light and dark regions caused by ambient occlusion. Unlike conventional QR codes, 3D QR codes do not fall off from the part and can even be painted if necessary. Furthermore, we do not need to prepare dark-colored and light-colored materials for 3D printing as the dark color is provided by the grooving. We demonstrate the effectiveness of our technique with various examples.", "keywords": "", "authors": [ { "name": "Ryosuke Kikuchi", "org": "Department of Mechanical Engineering, Yokohama National University, Japan" }, { "name": "Sora Yoshikawa", "org": "Department of Mechanical Engineering, Yokohama National University, Japan" }, { "name": "Pradeep Kumar Jayaraman", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, Singapore" }, { "name": "Takashi Maekawa", "org": "Department of Mechanical Engineering, Yokohama National University, Japan" } ], "venue": "Computer-Aided Design", "year": 2018 }, "plwXdI0S": { "id": "plwXdI0S", "title": "Segmentation-Based View-Dependent 3-D Graphics Model Transmission", "abstract": "For wireless network based graphics applications, a key challenge is how to efficiently transmit complex 3-D models over bandwidth-limited wireless channels. Most existing 3-D mesh transmission systems do not consider such a view-dependent delivery issue, and thus transmit unnecessary portions of 3-D mesh models, which leads to the waste in precious wireless network bandwidth. In this paper, we propose a novel view-dependent 3-D model transmission scheme, where a 3-D model is partitioned into a number of segments, each segment is then independently coded using the MPEG-4 3DMC coding algorithm, and finally only the visible segments are selected and delivered to the client. Moreover, we also propose analytical models to find the optimal number of segments so as to minimize the average transmission size. Simulation results show that such a view-based 3-D model transmission is able to substantially save the transmission bandwidth and therefore has a significant impact on wireless graphics applications.", "keywords": [ "Graphics", "Wireless mesh networks", "Bandwidth", "MPEG 4 Standard", "Geometry", "Compression algorithms", "Partitioning algorithms", "Analytical models", "Wireless communication", "Virtual reality" ], "authors": [ { "name": "Wei Guan", "org": "Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore" }, { "name": "Jianfei Cai", "org": "Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore" }, { "name": "Jianmin Zheng", "org": "Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore" }, { "name": "Chang Wen Chen", "org": "" } ], "venue": "IEEE Transactions on Multimedia", "year": 2008 }, "JKOavM1e": { "id": "JKOavM1e", "title": "Progressive Coding and Illumination and View Dependent Transmission of 3-D Meshes Using R-D Optimization", "abstract": "For transmitting complex 3D models over bandwidth-limited networks, efficient mesh coding and transmission are indispensable. The state-of-the-art 3D mesh transmission system employs wavelet-based progressive mesh coder, which converts an irregular mesh into a semi-regular mesh and directly applies the zerotree-like image coders to compress the wavelet vectors, and view-dependent transmission, which saves the transmission bandwidth through only delivering the visible portions of a mesh model. We propose methods to improve both progressive mesh cod- ing and transmission based on thorough rate-distortion (R- D) analysis. In particular, by noticing that the dependency among the wavelet coefficients generated in remeshing is not being considered in the existing approaches, we propose to introduce a preprocessing step to scale up the wavelets so that the inherent dependency of wavelets can be truly understood by the zerotree-like image compression algorithms. The weights used in the scaling process are carefully designed through thoroughly analyzing the distortions of wavelets at different refinement levels. For the transmission part, we propose to incorporate the illumination effects into the existing view-depend progressive mesh transmission system to further improve the performance. We develop a novel distortion model that considers both illumi- nation distortion and geometry distortion. Based on our proposed distortion model, given the viewing and lighting parameters, we are able to optimally allocate bits among different segments in real time. Simulation results show significant improvements in both progressive compression and transmission.", "keywords": [ "zerotree-like image compression algorithms", "progressive illumination", "image coding", "wavelet transforms", "rate-distortion analysis", "semi-regular mesh", "transmission part", "3-d meshes", "progressive mesh transmission", "zerotree-like image coders", "wavelet-based progressive mesh coder", "data compression", "view dependent transmission", "3d mesh transmission system", "transmission bandwidth", "illumination dependent", "semi-regular meshes", "progressive coding", "wavelet coefficients", "state-of-the-art 3-d mesh transmission", "progressive mesh coding", "geometry distortion", "efficient mesh coding", "r-d optimization", "view dependent", "existing view-depend progressive mesh", "irregular mesh", "mesh model", "transmission system", "bandwidth-limited networks", "rate distortion theory", "illumination distortion", "bandwidth", "image compression", "process design", "solid modeling", "wavelet analysis", "geometry", "lighting", "indexing terms" ], "authors": [ { "name": "Wei Guan", "org": "Comput. Sci. Dept., Univ. of Southern California, Los Angeles, CA, USA" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Juyong Zhang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "IEEE Trans. Circuits Syst. Video Techn.", "year": 2010 }, "wtj8FpPu": { "id": "wtj8FpPu", "title": "Solving the out-of-gamut problem in image composition", "abstract": "", "keywords": [ "image processing", "compression algorithm", "digital image", "energy minimization", "bernstein polynomial" ], "authors": [ { "name": "Wenxian Yang", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "ICIP", "year": 2010 }, "62Pou8ES": { "id": "62Pou8ES", "title": "Accurate and Efficient Approximation of Clothoids Using Bézier Curves for Path Planning.", "abstract": "An accurate and efficient clothoid approximation approach is presented in this paper using Bezier curves based on the minimization of curvature profile difference. Compared with existing methods, the proposed approach is able to guarantee higher order geometric continuity with smaller approximation error in terms of position, orientation, and curvature. The approximation scheme takes place in three stages. First, a subset of clothoids with specific winding angle constraints referred to as elementary clothoids is approximated using quintic Bezier curves. Then, a basic clothoid defined in the first quadrant is formulated, which is composed of a series of transformed elementary clothoids. An adaptive sampling stra-tegy is applied to ensure that the resulting Bezier segments are computed within a specified accuracy and all the required information can be obtained offline and stored in a lookup table. Finally, a general clothoid with arbitrary parameters can be conveniently approximated based on the lookup table through appropriate geometric transformations. A comparison with the recent circular interpolation and rational Bezier curve based approximation shows that the proposed approach is able to achieve equivalent or greater computational efficiency in most scenarios.", "keywords": "", "authors": [ { "name": "Yong Chen", "org": "" }, { "name": "Yiyu Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Daniel Thalmann", "org": "" } ], "venue": "IEEE Trans. Robotics", "year": 2017 }, "jYp88bMA": { "id": "jYp88bMA", "title": "Approximate T-spline surface skinning", "abstract": "This paper considers the problem of constructing a smooth surface to fit rows of data points. A special class of T-spline surfaces is examined, which is characterized to have a global knot vector in one parameter direction and individual knot vectors from row to row in the other parameter direction. These T-spline surfaces are suitable for lofted surface interpolation or approximation. A skinning algorithm using these T-spline surfaces is proposed, which does not require the knot compatibility of sectional curves. The algorithm consists of three main steps: generating sectional curves by interpolating data points of each row by a B-spline curve; computing the control curves of a skinning surface that interpolates the sectional curves; and approximating each control curve by a B-spline curve with fewer knots, which results in a T-spline surface. Compared with conventional B-spline surface skinning, the proposed T-spline surface skinning has two advantages. First, the sectional curves and the control curves of a T-spline surface can be constructed independently. Second, the generated T-spline skinning surface usually has much fewer control points than a lofted B-spline surface that fits the data points with the same error bound. Experimental examples have demonstrated the effectiveness of the proposed algorithm.", "keywords": [ "lofted b-spline surface", "b-spline curve", "skinning surface", "approximate t-spline surface skinning", "t-spline skinning surface", "sectional curve", "proposed t-spline surface skinning", "conventional b-spline surface skinning", "control curve", "t-spline surface", "lofted surface interpolation", "b", "t" ], "authors": [ { "name": "Xunnian Yang", "org": "Department of Mathematics, Zhejiang University, China" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" } ], "venue": "Computer-Aided Design", "year": 2012 }, "kfmQbIZ8": { "id": "kfmQbIZ8", "title": "Edge based parameterization for tubular meshes", "abstract": "This paper considers the problem of parameterizing triangular meshes that have tubular shapes. Unlike an open mesh that is of plane topological type, a tubular mesh gives rise to some special issues in parameterization due to its mesh structure. In this paper, we present an edge based parameterization method, in which the edges rather than the vertices of the mesh are treated as the target for parameterization. It improves cutting-based algorithms which cut the mesh to make it a disk topologically. The problem of cutting paths is their zigzag shape that leads to suboptimal parameterizations and finding good cutting paths is usually very difficult. Our proposed method does not need cutting of the mesh. It first parameterizes the edges on the two boundaries of the tubular mesh, then parameterizes the internal edges based on the mean value coordinates, and finally computes the parameters of the mesh vertices. Some examples are provided to demonstrate the effectiveness of our method.", "keywords": [ "good cutting path", "open mesh", "mesh structure", "mesh vertex", "tubular mesh", "triangular mesh", "cutting-based algorithm", "tubular shape", "parameterization method", "virtual reality" ], "authors": [ { "name": "Yimin Wang", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" } ], "venue": "VRCAI", "year": 2008 }, "dIjpW8vu": { "id": "dIjpW8vu", "title": "Object-level image segmentation using low level cues.", "abstract": "This paper considers the problem of automatically segmenting an image into a small number of regions that correspond to objects conveying semantics or high-level structure. Although such object-level segmentation usually requires additional high-level knowledge or learning process, we explore what low level cues can produce for this purpose. Our idea is to construct a feature vector for each pixel, which elaborately integrates spectral attributes, color Gaussian mixture models, and geodesic distance, such that it encodes global color and spatial cues as well as global structure information. Then, we formulate the Potts variational model in terms of the feature vectors to provide a variational image segmentation algorithm that is performed in the feature space. We also propose a heuristic approach to automatically select the number of segments. The use of feature attributes enables the Potts model to produce regions that are coherent in color and position, comply with global structures corresponding to objects or parts of objects and meanwhile maintain a smooth and accurate boundary. We demonstrate the effectiveness of our algorithm against the state-of-the-art with the data set from the famous Berkeley benchmark.", "keywords": [ "gaussian processes", "feature vector", "global structures", "global structure information", "high-level structure", "objects conveying semantics", "berkeley benchmark", "geodesic distance", "image segmentation", "high-level knowledge", "heuristic approach", "low level cue", "object segmentation", "low level cues", "image reconstruction", "object recognition", "color gaussian mixture model", "variational model", "learning process", "object-level image segmentation", "potts model", "potts variational model", "image colour analysis" ], "authors": [ { "name": "Hongyuan Zhu", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Nadia M Thalmann", "org": "" } ], "venue": "IEEE Transactions on Image Processing", "year": 2013 }, "pLWynAeq": { "id": "pLWynAeq", "title": "Orienting a protein model by crossing number to generate the characteristic views for identification", "abstract": "", "keywords": [ "projection", "crossing" ], "authors": [ { "name": "c k au", "org": "" }, { "name": "yiyu cai", "org": "" }, { "name": "jianmin zheng", "org": "" }, { "name": "tony woo", "org": "" } ], "venue": "Cmes-computer Modeling in Engineering & Sciences", "year": 2010 }, "JZGFkP4N": { "id": "JZGFkP4N", "title": "Point Cloud Based Path Planning for Tower Crane Lifting.", "abstract": "This paper discusses automatic path planning for tower crane lifting in highly complex environments to be digitized using point cloud representation. A mathematical optimization technique is developed to identify the lifting path with GPU accelerated massively parallel genetic algorithm. A continuous collision detection method is designed for real time application of collision avoidance during the crane lifting process.", "keywords": "", "authors": [ { "name": "Lihui Huang", "org": "Nanyang Technological University, Singapore" }, { "name": "Yuzhe Zhang", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Panpan Cai", "org": "National University of Singapore, Singapore" }, { "name": "Souravik Dutta", "org": "Nanyang Technological University, Singapore" }, { "name": "Yufeng Yue", "org": "Nanyang Technological University, Singapore" }, { "name": "Nadia Magnenat-Thalmann", "org": "Nanyang Technological University, Singapore" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University, Singapore" } ], "venue": "CGI", "year": 2018 }, "9JDYm7Fr": { "id": "9JDYm7Fr", "title": "Poselet-based multiple human identification and cosegmentation", "abstract": "Localizing, identifying and extracting human groups with consistent appearance jointly from a personal photo stream is an important problem and has wide applications. Inspired by recent advances in object detection, scene understanding and image cosegmentation, in this paper we explore explicit constraints to label and segment human objects rather than other non-human objects and “stuff”. We propose a novel soft human shape cue, which is initialized by color line poselet-based human part detection, further processed through a generalized geodesic distance transform, and refined finally with a joint bilateral filter. Such a high-level object cue is then integrated with other low-level unary and pairwise terms into a principled conditional random field framework, which can be efficiently solved by fast graph cut algorithms. We evaluate our algorithm over the FlickrMFC human dataset, and show that it achieves state-of-the-art performance for this challenging task.", "keywords": [ "high-level object cue", "differential geometry", "explicit constraints", "cosegmentation", "fast graph cut algorithms", "image segmentation", "poselet", "personal photo stream", "poselet-based multiple human identification", "human object labelling", "soft human shape cue", "low-level unary terms", "principled conditional random field framework", "shape cues", "human group localization", "color line poselet-based human part detection", "feature extraction", "human object segmentation", "object detection", "low-level pairwise terms", "human identification", "human group extraction", "filtering theory", "generalized geodesic distance transform", "graph theory", "transforms", "human group identification", "flickrmfc human dataset", "joint bilateral filter", "image colour analysis", "poselet-based multiple human co-segmentation" ], "authors": [ { "name": "Hongyuan Zhu", "org": "" }, { "name": "Jiangbo Lu", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Nadia Magnenat-Thalmann", "org": "" } ], "venue": "ICIP", "year": 2014 }, "S1y0tkYC": { "id": "S1y0tkYC", "title": "2D motion detection bounded hand 3D trajectory tracking and gesture recognition under complex background", "abstract": "In this paper, a 2D motion detection bounded hand 3D trajectory tracking and gesture recognition system is proposed for virtual reality interactions. First, the Bayes decision rule for classification of background and foreground is utilized to automatically locate the hand that bounded within a rectangle, and then the trajectory of the hand in 3D space is tracked by mean shift particle filter and stereo imaging. The skin color feature is exploited for image matting that effectively segment the hand contour in video sequence automatically. Finally the hand gesture is recognized by the connected component analysis and line approximation. The proposed technique works without any markers or constraints, overcomes the disturbance of arms and faces in the scene, and can recognize multiple hands with different gestures under complex background.", "keywords": [ "motion detection bounded hand", "bayes decision rule", "complex background", "trajectory tracking", "hand contour", "hand gesture", "proposed technique work", "different gesture", "multiple hand", "gesture recognition system", "gesture recognition", "mean shift", "virtual reality", "decision rule", "particle filter", "connected component" ], "authors": [ { "name": "Shuangqing Wu", "org": "Zhejiang University and Nanyang Technological University" }, { "name": "Yin Zhang", "org": "Zhejiang University" }, { "name": "Sanyuan Zhang", "org": "Zhejiang University" }, { "name": "Xiuzi Ye", "org": "Zhejiang University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Soumita Ghosh", "org": "Nanyang Technological University" }, { "name": "Wenyu Chen", "org": "Nanyang Technological University" }, { "name": "Jane Zhang", "org": "California Polytechnic State University" } ], "venue": "VRCAI", "year": 2010 }, "DAjg4ydk": { "id": "DAjg4ydk", "title": "Effective T-spline representation for VRML", "abstract": "", "keywords": [], "authors": [ { "name": "wenyu chen", "org": "" }, { "name": "yusha li", "org": "" }, { "name": "jianjiang pan", "org": "" }, { "name": "jianmin zheng", "org": "" }, { "name": "yiyu cai", "org": "" } ], "venue": "", "year": 2012 }, "47hG02gV": { "id": "47hG02gV", "title": "Periodic t-splines and tubular surface fitting", "abstract": "This paper discusses a special type of T-spline surfaces called periodic T-splines that are closed in one parameter direction, and their application in tubular surface fitting. First, a global representation is proposed for representing periodic T-splines. This representation does not require repeating control points, which facilitates surface fitting process. Then, an algorithm for adaptively fitting periodic T-splines to a tubular triangular mesh that has the same topology as a cylinder is presented. The resulting periodic T-spline is obtained respecting the geometric distribution of the input mesh. The use of periodic T-splines for tubular surface fitting has at least two advantages: 1) adaptive fitting is easily achieved due to the local refinement of T-splines; 2) the algorithm avoids cutting the mesh to make it a disk topologically for conventional B-spline fitting due to the periodic representation and this overcomes the drawback of finding a good cutting path, which is usually difficult.", "keywords": [ "adaptively fitting periodic t-splines", "adaptive fitting", "tubular surface fitting", "periodic t-splines", "global representation", "periodic representation", "fitting process", "input mesh", "periodic t-spline", "t-spline surface" ], "authors": [ { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Yimin Wang", "org": "Next Generation Web, IBM Research, Beijing, China" } ], "venue": "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)", "year": 2012 }, "tIBNLQqO": { "id": "tIBNLQqO", "title": "Self-supervised CNN for Unconstrained 3D Facial Performance Capture from an RGB-D Camera.", "abstract": "We present a novel method for real-time 3D facial performance capture with consumer-level RGB-D sensors. Our capturing system is targeted at robust and stable 3D face capturing in the wild, in which the RGB-D facial data contain noise, imperfection and occlusion, and often exhibit high variability in motion, pose, expression and lighting conditions, thus posing great challenges. The technical contribution is a self-supervised deep learning framework, which is trained directly from raw RGB-D data. The key novelties include: (1) learning both the core tensor and the parameters for refining our parametric face model; (2) using vertex displacement and UV map for learning surface detail; (3) designing the loss function by incorporating temporal coherence and same identity constraints based on pairs of RGB-D images and utilizing sparse norms, in addition to the conventional terms for photo-consistency, feature similarity, regularization as well as geometry consistency; and (4) augmenting the training data set in new ways. The method is demonstrated in a live setup that runs in real-time on a smartphone and an RGB-D sensor. Extensive experiments show that our method is robust to severe occlusion, fast motion, large rotation, exaggerated facial expressions and diverse lighting.", "keywords": "", "authors": [ { "name": "Yudong Guo", "org": "" }, { "name": "Juyong Zhang", "org": "" }, { "name": "Lin Cai", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "arXiv: Computer Vision and Pattern Recognition", "year": 2018 }, "xDUgESqc": { "id": "xDUgESqc", "title": "Algebraic and geometric characterizations of a class of planar quartic curves with rational offsets.", "abstract": "Planar polynomial curves have rational offset curves, if they are either Pythagorean-hodograph (PH) or indirect Pythagorean-hodograph (iPH) curves. In this paper, we derive an algebraic and two geometric characterizations for planar quartic iPH curves. The characterizations are given in terms of quantities related to the Bézier control polygon of the curve, and naturally extend to quartic and cubic PH and quadratic iPH curves.", "keywords": [ "Quartic Bézier curves", "Offset curves", "Pythagorean hodograph" ], "authors": [ { "name": "Kai Hormann", "org": "Università della Svizzera italiana, Lugano, Switzerland" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" } ], "venue": "Computer Aided Geometric Design", "year": 2020 }, "rFz20gq2": { "id": "rFz20gq2", "title": "Bivariate splines over triangular meshes for freeform surface modeling with sharp features", "abstract": "ABSTRACTThis paper presents a novel scheme for constructing bivariate spline surfaces over triangular meshes which are topologically equivalent to a disk. The core part of the scheme is a set of knot selection rules that define local configurations of a triangulation called the directed-one-ring-cycle (D1RC) configurations and bivariate splines defined over a D1RC configuration that are new non-tensor-product splines and possess many nice properties of a univariate B-spline. Using D1RC splines, we take an input triangular mesh as a control mesh and define a bivariate spline surface from the control mesh, which mimics the standard NURBS modeling. Moreover, we can introduce sharp features into the overall smooth spline surface by simply setting special D1RC configurations. As a result, the proposed scheme can define spline surfaces in a way similar to that of NURBS, but has less restriction on the connectivity of the input control mesh.", "keywords": "", "authors": [ { "name": "Juan Cao", "org": "Xiamen University, China" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" } ], "venue": "Computer-aided Design and Applications", "year": 2017 }, "K42eMTkV": { "id": "K42eMTkV", "title": "Real‐Time Subspace Integration for Example‐Based Elastic Material", "abstract": "", "keywords": [], "authors": [ { "name": "Wenjing Zhang", "org": "nanyang technological university" }, { "name": "Jianmin Zheng", "org": "nanyang technological university" }, { "name": "Nadia Magnenat-Thalmann", "org": "nanyang technological university" } ], "venue": "Computer Graphics Forum", "year": 2015 }, "1UrTua4E": { "id": "1UrTua4E", "title": "Euler arc splines for curve completion.", "abstract": "", "keywords": [], "authors": [ { "name": "xunnian yang", "org": "" }, { "name": "hailing zhou", "org": "" }, { "name": "jianmin zheng", "org": "" } ], "venue": "Computers & Graphics", "year": 2012 }, "3ECKF6sQ": { "id": "3ECKF6sQ", "title": "T-splines in VRML", "abstract": "T-splines are increasingly popular in design and animation. However, since it is not supported by VRML/X3D, T-spline visualization is not available for the use online. This paper proposes the T-spline VRML node, which allows the end users to utilize T-splines for complex model design and online visualization with relatively small number of control points. Similar with the NURBS based and polygon based VRML nodes, T-spline VRML node can support geometry, color, texture, LOD and animation. The file size required for T-spline VRML node to represent a same complex model can be substantially minimized compared with the ones with NURBS based and polygonal based VRML nodes. Thus, it is feasible for data transmission on internet. A new data structure is proposed to represent T-spline surfaces in VRML for easy editing. The implementation details and the application examples of the proposed node are discussed.", "keywords": [ "complex model", "online visualization", "t-spline visualization", "t-spline vrml node", "proposed node", "new data structure", "data transmission", "t-spline surface", "vrml node", "complex model design", "nurbs", "t splines", "virtual reality", "data structure" ], "authors": [ { "name": "Wenyu Chen", "org": "Nanyang Technological University" }, { "name": "Yusha Li", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Jianjiang Pan", "org": "Nanyang Technological University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" } ], "venue": "VRCAI", "year": 2011 }, "kFRd2Vm3": { "id": "kFRd2Vm3", "title": "The mu-basis of a rational ruled surface", "abstract": "The mu-basis of a planar rational curve is a polynomial ideal basis comprised of two polynomials that greatly facilitates computing the implicit equation of the curve. This paper defines a mu-basis for a rational ruled surface, and presents a simple algorithm for computing the mu-basis. The mu-basis consists of two polynomials p(x,y,z,s) and q(x,y,z,s) that are linear in x,y,z and degree μ and m−μ in s respectively, where m is the degree of the implicit equation. The implicit equation of the surface is then obtained by merely taking the resultant of p and q with respect to s . This implicitization algorithm is faster and/or more robust than previous methods.", "keywords": [ "mu-basis", "moving plane", "syzygy", "ruled surface", "implicitization", "module" ], "authors": [ { "name": "Falai Chen", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Thomas W. Sederberg", "org": "" } ], "venue": "Computer Aided Geometric Design", "year": 2001 }, "K6g8nONC": { "id": "K6g8nONC", "title": "Physically-Based NURBS Surface Editing With Curves", "abstract": "", "keywords": [ "nurbs" ], "authors": [ { "name": "yuewen ma", "org": "" }, { "name": "jianmin zheng", "org": "" }, { "name": "kai wang", "org": "" } ], "venue": "Computer-aided Design and Applications", "year": 2013 }, "V3ALKjeJ": { "id": "V3ALKjeJ", "title": "End-to-End 3D Point Cloud Instance Segmentation Without Detection", "abstract": "3D instance segmentation plays a predominant role in environment perception of robotics and augmented reality. Many deep learning based methods have been presented recently for this task. These methods rely on either a detection branch to propose objects or a grouping step to assemble same-instance points. However, detection based methods do not ensure a consistent instance label for each point, while the grouping step requires parameter-tuning and is computationally expensive. In this paper, we introduce a novel framework to enable end-to-end instance segmentation without detection and a separate step of grouping. The core idea is to convert instance segmentation to a candidate assignment problem. At first, a set of instance candidates is sampled. Then we propose an assignment module for candidate assignment and a suppression module to eliminate redundant candidates. A mapping between instance labels and instance candidates is further sought to construct an instance grouping loss for the network training. Experimental results demonstrate that our method is more effective and efficient than previous approaches.", "keywords": "", "authors": [ { "name": "Haiyong Jiang", "org": "Nanyang Technological University" }, { "name": "Feilong Yan", "org": "" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" }, { "name": "Jun Xiao", "org": "" } ], "venue": "CVPR", "year": 2020 }, "LdayfpRa": { "id": "LdayfpRa", "title": "Skeleton-Aware 3D Human Shape Reconstruction From Point Clouds.", "abstract": "", "keywords": "", "authors": [ { "name": "Haiyong Jiang", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "ICCV", "year": 2019 }, "1rLvfKo5": { "id": "1rLvfKo5", "title": "Reciprocal frame structures made easy", "abstract": "A reciprocal frame (RF) is a self-supported three-dimensional structure made up of three or more sloping rods, which form a closed circuit, namely an RF-unit. Large RF-structures built as complex grillages of one or a few similar RF-units have an intrinsic beauty derived from their inherent self-similar and highly symmetric patterns. Designing RF-structures that span over large domains is an intricate and complex task. In this paper, we present an interactive computational tool for designing RF-structures over a 3D guiding surface, focusing on the aesthetic aspect of the design. There are three key contributions in this work. First, we draw an analogy between RF-structures and plane tiling with regular polygons, and develop a computational scheme to generate coherent RF-tessellations from simple grammar rules. Second, we employ a conformal mapping to lift the 2D tessellation over a 3D guiding surface, allowing a real-time preview and efficient exploration of wide ranges of RF design parameters. Third, we devise an optimization method to guarantee the collinearity of contact joints along each rod, while preserving the geometric properties of the RF-structure. Our tool not only supports the design of wide variety of RF pattern classes and their variations, but also allows preview and refinement through interactive controls.", "keywords": [ "rf pattern class", "computational scheme", "rf design parameter", "interactive computational tool", "complex grillages", "designing rf-structures", "guiding surface", "complex task", "interactive control", "reciprocal frame structure", "large rf-structures" ], "authors": [ { "name": "Peng Song", "org": "Nanyang Technological University, Singapore" }, { "name": "Chi-Wing Fu", "org": "Nanyang Technological University, Singapore" }, { "name": "Prashant Goswami", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Niloy J. Mitra", "org": "University College London" }, { "name": "Daniel Cohen-Or", "org": "Tel Aviv University" } ], "venue": "ACM Trans. Graph.", "year": 2013 }, "JfwPvuWW": { "id": "JfwPvuWW", "title": "Design of a Flexible Articulated Robotic Hand for a Humanoid Robot", "abstract": "It is often desirable for humanoid robots to have dexterous hands and perform human-like grasps. This requires a deliberate design of hands, in addition to a good actuation system and an efficient 3D vision system. In this paper, we present a simple method to produce a customized articulated robotic hand for a humanoid robot (eg., Nadine social robot). Our method acquires the 3D shape by 3D scanning, which can cost-effectively generate customized hands. Guided by the human hand anatomy and inspired by the progress of 3D printing technology, we model the structure of the robotic hand using standard shapes such as cuboids, spheres and cylinders, which are adapted to match the scanned shape and fabricated using 3D printing. Moreover, we choose flexible resin materials11https://formlabs.com/3d-printers/form-2/, which are supported by 3D printers, to make the fabricated hand flexible enough for natural deformation. As a result, our designed robotic hand has six degrees of freedom and together with a cable-driven actuation system can achieve the range of motion as a human hand. Experimental results demonstrated that our robotic hand is capable of grasping a variety of objects with different shapes.", "keywords": "", "authors": [ { "name": "Li Tian", "org": "Nanyang Technological University, Singapore." }, { "name": "Jing Liu", "org": "Nanyang Technological University, Singapore." }, { "name": "Nadia Magnenat Thalmann", "org": "Nanyang Technological University, Singapore." }, { "name": "Daniel Thalmann", "org": "École Polytechnique Federale de Lausanne, Switzerland" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore." } ], "venue": "Humanoids", "year": 2019 }, "Zt6hu4xL": { "id": "Zt6hu4xL", "title": "Mesh Denoising using Extended ROF Model with L1 Fidelity", "abstract": "This paper presents a variational algorithm for feature-preserved mesh denoising. At the heart of the algorithm is a novel variational model composed of three components: fidelity, regularization and fairness, which are specifically designed to have their intuitive roles. In particular, the fidelity is formulated as an L1 data term, which makes the regularization process be less dependent on the exact value of outliers and noise. The regularization is formulated as the total absolute edge-lengthed supplementary angle of the dihedral angle, making the model capable of reconstructing meshes with sharp features. In addition, an augmented Lagrange method is provided to efficiently solve the proposed variational model. Compared to the prior art, the new algorithm has crucial advantages in handling large scale noise, noise along random directions, and different kinds of noise, including random impulsive noise, even in the presence of sharp features. Both visual and quantitative evaluation demonstrates the superiority of the new algorithm.", "keywords": [], "authors": [ { "name": "Xiaoqun Wu", "org": "nanyang technological university" }, { "name": "Jianmin Zheng", "org": "nanyang technological university" }, { "name": "Yiyu Cai", "org": "nanyang technological university" }, { "name": "Chi-Wing Fu", "org": "nanyang technological university" } ], "venue": "Computer Graphics Forum", "year": 2015 }, "uhSteeYf": { "id": "uhSteeYf", "title": "Rate-Distortion Optimized Progressive 3D Reconstruction from Multi-view Images", "abstract": "Most of the previous multi-view reconstruction algorithms focus on minimizing reconstruction distortion, i.e. reconstructing a 3D model as close to the real object as possible, and rely on subsequent simplification process to control the reconstruction rate for practical usage. In this paper, in addition to reconstruction distortion, we directly consider the reconstruction rate in wide-baseline multi-view reconstruction. In particular, we develop a novel rate-distortion efficient multi-view reconstruction system, which consists of two major components: the PDE-based mesh optimization and the local subdivision based mesh refinement. Although both components are prior arts, to achieve rate-distortion optimization, new ingredients are proposed including non-uniform sample distribution for efficient and accurate surface distortion approximation in mesh optimization and non-uniform vertex distribution in mesh refinement. From a set of calibrated and segmented wide baseline images, our developed system is able to reconstruct the optimal 3D mesh that achieves minimum reconstruction distortion at any rate within a certain range. Experimental results show that our proposed system significantly outperforms the original PDE-based reconstruction method in both rate-distortion performance and visual quality.", "keywords": [], "authors": [ { "name": "Viet Nam Nghiem", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Pacific Conference on Computer Graphics and Applications", "year": 2010 }, "sPV7qFmf": { "id": "sPV7qFmf", "title": "A geometric approach to the modeling of the catheter-heart interaction for VR simulation of intra-cardiac intervention.", "abstract": "", "keywords": [], "authors": [ { "name": "Patricia Chiang", "org": "" }, { "name": "Yiyu Cai", "org": "" }, { "name": "Koon Hou Mak", "org": "" }, { "name": "Ei Mon Soe", "org": "" }, { "name": "Chee-Kong Chui", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Computers & Graphics", "year": 2011 }, "mhWG6O2g": { "id": "mhWG6O2g", "title": "Progressive surface reconstruction for heart mapping procedure", "abstract": "The composite imaging of measured cardiac properties like electrical activation and contractile properties on a reconstructed endocardial surface allows for the diagnosis of cardiac arrhythmia and myocardial infarct. However, it is difficult for an interventionalist to acquire heart surface contacts by navigating a catheter to the desired region of interest under minimal visual aid. This paper discusses a new method for the progressive reconstruction of an endocardial surface during a heart mapping procedure. A generic mesh is first aligned with a set of anchor points to obtain a first approximation of the surface. Subsequent deformations are constrained by the preservation of local surface characteristics and the fidelity of new contact points. The mesh is refined by local subdivision and its geometrical shape is further improved by edge swapping. Compared to prior art, the new method can reconstruct a realistic surface from a set of sparse and random data. It can advantageously provide a smooth reconstruction at initial acquisition and ensure a geometrical consistency between consecutive reconstructions. The accurate reconstruction of a heart chamber provides important visual cues for an interventionalist to decide on the next mapping site, thus constructively influencing the final diagnosis.", "keywords": [ "local surface characteristic", "accurate reconstruction", "progressive surface reconstruction", "consecutive reconstruction", "reconstructed endocardial surface", "heart surface contact", "realistic surface", "heart chamber", "new method", "heart mapping procedure", "endocardial surface", "subdivision" ], "authors": [ { "name": "Patricia Chiang", "org": "School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore" }, { "name": "Koon Hou Mak", "org": "Mak Heart Clinic, Gleneagles Medical Center, 6 Napier Road, Singapore 258499, Singapore" }, { "name": "Nadia Magnenat Thalmann", "org": "Institute for Media Innovation, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore" }, { "name": "Yiyu Cai", "org": "School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore and Institute for Media Innovation, Nanyang Technological University, ..." } ], "venue": "Computer-Aided Design", "year": 2012 }, "wLtJz7RS": { "id": "wLtJz7RS", "title": "An algorithm for finding intersection between ball B-spline curves.", "abstract": "Abstract A ball B-spline curve (BBSC) is a skeleton based solid model representation, which consists of a B-spline curve and a B-spline function serving as the (varying) radius of a ball moving along the B-spline curve. The surface shape specified by the BBSC is the envelope of the moving ball and thus the BBSC is very suitable for representing vascular shapes. To apply this good representation in various fields as CSG-to-boundary conversion, Boolean operations, geometric design, pattern recognition, scientific visualization, this paper proposes an efficient algorithm to solve their common fundamental intersection problem. The surface of each BBSC is decomposed into a starting spherical patch, a set of lateral surfaces defined by ball Bezier curves (BBC), and an ending spherical patch. The intersection algorithm proceeds in four steps: (1) tessellating both BBSCs into triangular meshes and computing the intersection curves between the triangular meshes, which serve as the initial intersections for later refinement; (2) parameterizing the surfaces/patches of one BBSC and implicitizing the surfaces/patches of the other BBSC; (3) calculating the intersection curves between a parametric surface and an implicit surface numerically by using the Newton’s method; and (4) tracing the intersection curves for the construction of intersection solid regions. In particular, we present simple methods for parameterization and implicitization of BBSCs, which are the core of the proposed algorithm. And BBSC is a solid model, therefore the intersection of BBSCs is the intersection of solid models, and the final intersection result is also a solid object. Experimental results show that our method is able to efficiently find the intersections of BBSCs with high accuracy.", "keywords": "", "authors": [ { "name": "Qian Fu", "org": "College of Information Science and Technology, Beijing Normal University, No. 19, XinJieKouWai St., HaiDian District, Beijing 100875, PR China" }, { "name": "Zhongke Wu", "org": "College of Information Science and Technology, Beijing Normal University, No. 19, XinJieKouWai St., HaiDian District, Beijing 100875, PR China" }, { "name": "Xingce Wang", "org": "College of Information Science and Technology, Beijing Normal University, No. 19, XinJieKouWai St., HaiDian District, Beijing 100875, PR China" }, { "name": "Mingquan Zhou", "org": "" }, { "name": "Jianmin Zheng", "org": "School of Computer Science and Engineering, Nanyang Technological University, Blk N4, Nanyang Avenue, Singapore 639798, Singapore" } ], "venue": "J. Computational Applied Mathematics", "year": 2018 }, "bob8PflE": { "id": "bob8PflE", "title": "Prediction of Negative Symptoms of Schizophrenia from Emotion Related Low-Level Speech Signals.", "abstract": "Negative symptoms of schizophrenia are often associated with the blunting of emotional affect which creates a serious impediment in the daily functioning of the patients. Affective prosody is almost always adversely impacted in such cases, and is known to exhibit itself through the low-level acoustic signals of prosody. To automate and simplify the process of assessment of severity of emotion related symptoms of schizophrenia, we utilized these low-level acoustic signals to predict the expert subjective ratings assigned by a trained psychologist during an interview with the patient. Specifically, we extract acoustic features related to emotion using the openSMILE toolkit from the audio recordings of the interviews. We analysed the interviews of 78 paid participants (52 patients and 26 healthy controls) in this study. The subjective ratings could be accurately predicted from the objective openSMILE acoustic signals with an accuracy of 61-85% using machine-learning algorithms with leave-one-out cross-validation technique. Furthermore, these objective measures can be reliably utilized to distinguish between the patient and healthy groups, as supervised learning methods can classify the two groups with 79-86% accuracy.", "keywords": "", "authors": [ { "name": "Debsubhra Chakraborty", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Zixu Yang", "org": "Institute of Mental Health, Singapore" }, { "name": "Yasir Tahir", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Tomasz Maszczyk", "org": "" }, { "name": "Justin Dauwels", "org": "School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore" }, { "name": "Nadia Magnenat-Thalmann", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Yogeswary Maniam", "org": "Institute of Mental Health, Singapore" }, { "name": "Nur Amirah", "org": "" }, { "name": "Bhing-Leet Tan", "org": "" }, { "name": "Jimmy Lee", "org": "" } ], "venue": "ICASSP", "year": 2018 }, "iOJl5yz0": { "id": "iOJl5yz0", "title": "Minimizing the maximal ratio of weights of a rational Bézier curve", "abstract": "This paper presents a solution to the problem of reparameterizing a rational curve by a Möbius transformation such that the maximal ratio of weights in the reparameterized representation is minimized. The problem is reduced to solving a linear programming problem, which can be solved directly and simply. The result can be used to reparameterize rational curves so as to yield tight bounds on derivatives.", "keywords": [ "möbius transformation", "rational b", "tight bound", "reparameterized representation", "zier curve", "bius transformation", "maximal ratio", "mobius transformation", "rational curve", "linear programming problem", "weights", "rational bézier curves", "lp problem", "linear program" ], "authors": [ { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798" } ], "venue": "Computer Aided Geometric Design", "year": 2005 }, "GoOWsZHI": { "id": "GoOWsZHI", "title": "Photo-realistic Face Images Synthesis for Learning-based Fine-scale 3D Face Reconstruction.", "abstract": "", "keywords": "", "authors": [ { "name": "Yudong Guo", "org": "" }, { "name": "Juyong Zhang", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Boyi Jiang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "CoRR", "year": 2017 }, "X2t5FlnW": { "id": "X2t5FlnW", "title": "Variational structure-texture image decomposition on manifolds", "abstract": "This paper considers the problem of decomposing an image defined on a manifold into a structural component and a textural component. We formulate such decomposition as a variational problem, in which the total variation energy is used for extracting the structural part and based on the properties of texture one of three norms, L^2, L^1 and G, is used in the fidelity term for the textural part. While L^2 and G norms are used for texture of no a prior knowledge or oscillating pattern, L^1 norm is used for structural or sparse texture. We develop efficient numerical methods to solve the proposed variational problems using augmented Lagrangian methods (ALM) when the manifold is represented by a triangular mesh. The contributions of the paper are two-fold: (1) We adapt the variational structure-texture image decomposition to manifolds, which takes the intrinsic property of manifolds into account. The non-quadratic fidelity terms with L^1 and G norms are extended to 3D triangular meshes for the first time. (2) We show how to efficiently tackle the variational problems with non-linearity/non-differentiability terms by iteratively solving some sub-problems that either have closed form solutions or are to solve linear equations. We demonstrate the effectiveness of the proposed methods with examples and applications in detail enhancement and impulsive noise removal.", "keywords": [ "fidelity term", "sparse texture", "variational structure-texture image decomposition", "non-quadratic fidelity term", "structural part", "variational problem", "structural component", "triangular mesh", "proposed variational problem", "g norm", "manifolds", "l2 norm" ], "authors": [ { "name": "Xiaoqun Wu", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore, Singapore" }, { "name": "Chunlin Wu", "org": "National University of Singapore, Singapore, Singapore" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University, Singapore, Singapore" } ], "venue": "Signal Processing", "year": 2013 }, "0Q8z2cGU": { "id": "0Q8z2cGU", "title": "Fast visualization of complex 3D models using displacement mapping", "abstract": "We present a simple method to render complex 3D models at interactive rates using real-time displacement mapping. We use an octree to decompose the 3D model into a set of height fields and display the model by rendering the height fields using per-pixel displacement mapping. By simply rendering the faces of the octree voxels to produce fragments for ray-casting on the GPU, and with straightforward transformation of view rays to the displacement map's local space, our method is able to accurately render the object's silhouettes with very little special handling. The algorithm is especially suitable for fast visualization of high-detail point-based models, and models made up of unprocessed triangle meshes that come straight from range scanning. This is because our method requires much less preprocessing time compared to the traditional triangle-based rendering approach, which usually needs a large amount of computation to preprocess the input model into one that can be rendered more efficiently. Unlike the point-based rendering approach, the rendering efficiency of our method is not limited by the number of input points. Our method can achieve interactive rendering of models with more than 300 millions points on standard graphics hardware.", "keywords": [ "interactive rendering", "height field", "simple method", "traditional triangle-based rendering approach", "rendering efficiency", "per-pixel displacement mapping", "fast visualization", "input model", "displacement map", "point-based rendering approach", "high-detail point-based model", "ray casting", "triangle mesh", "graphics hardware", "real time" ], "authors": [ { "name": "The-Kiet Lu", "org": "Nanyang Technological University" }, { "name": "Kok-Lim Low", "org": "National University of Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" } ], "venue": "Graphics Interface 2012", "year": 2009 }, "fvYMEEWi": { "id": "fvYMEEWi", "title": "Corrigendum to: 'Linear perturbation methods for topologically consistent representations of free-form surface intersections': Computer Aided Geometric Design 21 (2004) 303-319", "abstract": "", "keywords": [], "authors": [ { "name": "Xiaowen Song", "org": "" }, { "name": "Thomas W. Sederberg", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Rida T. Farouki", "org": "" }, { "name": "Joel Hass", "org": "" } ], "venue": "Computer Aided Geometric Design", "year": 2004 }, "yUNJsvc1": { "id": "yUNJsvc1", "title": "Facial Expression Retargeting from Human to Avatar Made Easy.", "abstract": "Facial expression retargeting from human to virtual characters is a useful technique in computer graphics and animation. Traditional methods use markers or blendshapes to construct the mapping between human and avatar faces. However, these approaches require tedious 3D modeling process and the performance relies on modelers' experience. In this paper, we propose a brand-new solution to this cross-domain expression transfer problem via nonlinear expression embedding and expression domain translation. We first build low-dimensional latent spaces for human and avatar facial expressions by variational autoencoder. Then we construct correspondences between the two latent spaces guided by geometric and perceptual constraints. Specifically, we design two-scale geometric correspondences to reflect geometric matching and utilize the triplet data structure to express the user's perceptual preference of avatar expressions. A user-friendly method is proposed to automatically generates triplets, with which users can easily and efficiently annotate the correspondences. Using both geometric and perceptual correspondences, we finally train a network for expression domain translation from human to avatar. Extensive experimental results and user studies demonstrate that even non-professional users can apply our method to generate high-quality facial expression retargeting results with less time and efforts.", "keywords": "", "authors": [ { "name": "Juyong Zhang", "org": "" }, { "name": "Keyu Chen", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "IEEE transactions on visualization and computer graphics", "year": 2020 }, "HkbGw7f4": { "id": "HkbGw7f4", "title": "Freeform-based form feature modeling using a hierarchical & multi-resolution NURBS method", "abstract": "In a three dimensional (3D) environment, non-uniform rational B-spline surfaces (NURBS) have been a standard in CAD industry for free-form shape modelling. Feature based design is widely used in CAD design. This paper addresses the issue of form feature design on free-form surfaces. Based on the multi-resolution and refinement scheme, the Hierarchical NURBS (H-NURBS) representation is proposed for localized form feature modelling. More specifically, the patch-based form feature modelling concept will be discussed. H-NURBS representation introduced here not only offers powerful functionality for form feature modeling on freeform surface, but also overcomes the problems inherited from the traditional control point based shape modelling. We will investigate first the extrusion operation to create various form features on freeform surfaces. Patterning operation of form features as well as form feature cut-&-paste operation on freeform surfaces/shapes will be studied for efficient and effective local shape design. Interactive methodology and techniques will be developed for the patch-based form feature modelling with an emphasis on the native and easy parameter control.", "keywords": [ "form feature cut", "freeform-based form feature modeling", "shape modelling", "localized form feature modelling", "cad design", "freeform surface", "various form feature", "form feature modeling", "patch-based form", "free-form shape modelling", "form feature design", "multi-resolution nurbs method", "three dimensional", "nurbs", "hierarchy", "power function" ], "authors": [ { "name": "Wenyu Chen", "org": "Nanyang Technological University" }, { "name": "Yiyu Cai", "org": "Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University" } ], "venue": "VRCAI", "year": 2010 }, "5cJebeoF": { "id": "5cJebeoF", "title": "On linear independence of T-spline blending functions", "abstract": "This paper shows that, for any given T-spline, the linear independence of its blending functions can be determined by computing the nullity of the T-spline-to-NURBS transform matrix. The paper analyzes the class of T-splines for which no perpendicular T-node extensions intersect, and shows that the blending functions for any such T-spline are linearly independent.", "keywords": [ "T-spline blending function", "linear independence", "perpendicular T-node extensions intersect", "blending function" ], "authors": [ { "name": "Xin Li", "org": "University of Science and Technology of China, Hefei, Anhui, PR China" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Thomas W. Sederberg", "org": "Computer Science Department, Brigham Young University, United States" }, { "name": "Thomas J. R. Hughes", "org": "ICES, University of Texas at Austin, United States" }, { "name": "Michael A. Scott", "org": "ICES, University of Texas at Austin, United States" } ], "venue": "Computer Aided Geometric Design", "year": 2012 }, "2oXRa0KC": { "id": "2oXRa0KC", "title": "A Methodology to Model and Simulate Customized Realistic Anthropomorphic Robotic Hands.", "abstract": "When building robotic hands, researchers are always face with two main issues of how to make robotic hands look human-like and how to make robotic hands function like real hands. Most existing solutions solve these issues by manually modelling the robotic hand [10-18]. However, the design processes are long, and it is difficult to duplicate the geometry shape of a human hand. To solve these two issues, this paper presents a simple and effective method that combines 3D printing and digitization techniques to create a 3D printable cable-driven robotic hand from scanning a physical hand. The method involves segmenting the 3D scanned hand model, adding joints, and converting it into a 3D printable model. Comparing to other robotic solutions, our solution retains more than 90% geometry information of a human hand1, which is attained from 3D scanning. Our modelling progress takes around 15 minutes that include 10 minutes of 3D scanning and five minutes for changing the scanned model to an articulated model by running our algorithm. Compared to other articulated modelling solutions [19, 20], our solution is compatible with an actuation system which provides our robotic hand with the ability to mimic different gestures. We have also developed a way of representing hand skeletons based on the hand anthropometric. As a proof of concept, we demonstrate our robotic handu0027s performance in the grasping experiments.", "keywords": "", "authors": [ { "name": "Li Tian", "org": "Nanyang Technological University, Singapore" }, { "name": "Nadia Magnenat-Thalmann", "org": "Nanyang Technological University, Singapore" }, { "name": "Daniel Thalmann", "org": "EPFL, Switzerland" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" } ], "venue": "CGI", "year": 2018 }, "eUrSdWFE": { "id": "eUrSdWFE", "title": "Foldover-Free Mesh Warping for Constrained Texture Mapping", "abstract": "Mapping texture onto 3D meshes with positional constraints is a popular technique that can effectively enhance the visual realism of geometric models. Such a process usually requires constructing a valid mesh embedding satisfying a set of positional constraints, which is known to be a challenging problem. This paper presents a novel algorithm for computing a foldover-free piecewise linear mapping with exact positional constraints. The algorithm begins with an unconstrained planar embedding, followed by iterative constrained mesh transformations. At the heart of the algorithm are radial basis function (RBF)-based warping and the longest edge bisection (LEB)-based refinement. A delicate integration of the RBF-based warping and the LEB-based refinement provides a provably-foldover-free, smooth constrained mesh warping, which can handle a large number of constraints and output a visually pleasing mapping result without extra smoothing optimization. The experiments demonstrate the effectiveness of the proposed algorithm.", "keywords": [ "radial basis function-based warping", "rbf-based interpolation", "radial basis function networks", "3d geometric models", "longest edge bisection-based refinement", "exact positional constraints", "3d meshes", "interpolation", "triangular meshes", "leb-based refinement", "rbf-based warping", "mesh generation", "valid mesh embedding", "computational geometry", "smooth constrained mesh warping", "iterative constrained mesh transformations", "foldover-free mesh warping", "visual realism enhancement", "foldover-free mapping", "solid modelling", "unconstrained planar embedding", "transforms", "foldover-free piecewise linear mapping", "image texture", "adaptive refinement", "constrained texture mapping", "texture", "iterative methods", "solid modeling", "steiner trees" ], "authors": [ { "name": "Yuewen Ma", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Jian Xie", "org": "" } ], "venue": "IEEE Trans. Vis. Comput. Graph.", "year": 2015 }, "W13bEsK1": { "id": "W13bEsK1", "title": "Image reconstruction using Loop subdivision", "abstract": "", "keywords": [], "authors": [ { "name": "hailing zhou", "org": "" }, { "name": "jianmin zheng", "org": "" }, { "name": "xin li", "org": "" } ], "venue": "", "year": 2010 }, "1qXy6XH6": { "id": "1qXy6XH6", "title": "Reference Plane Assisted Sketching Interface for 3D Freeform Shape Design", "abstract": "This paper presents a sketch-based modeling system with auxiliary planes as references for 3D freeform shape design. The user first creates a rough 3D model of arbitrary topology by sketching some contours of the model. Then the user can use sketching to perform deformation, extrusion, etc, to edit the model. To regularize and interpret the user's inputs properly, we introduce some rules for the strokes into the system, which are based on both the semantic meaning of the sketched strokes and human psychology. Unlike other sketching systems, all the creation and editing operations in the presented system are performed with reference to some auxiliary planes that are automatically constructed based on the user's sketches or default settings. The use of reference planes provides a heuristic solution to the problem of ambiguity of 2D interface for modeling in 3D space. Examples demonstrate that the presented system can allow the user to intuitively and intelligently create and edit 3D models even with complex topology, which is usually difficult in other similar sketch-based modeling systems.", "keywords": [ "complex topology", "auxiliary plane", "3d freeform shape design", "reference plane", "interaction techniques", "similar sketch-based modeling system", "rough 3d model", "reference plane assisted sketching", "user interfaces", "human psychology", "default setting", "sketch based modeling system", "sketched stroke", "heuristic solution", "psychology", "semantic meaning", "reference planes", "arbitrary topology", "topology", "sketch based interface and modeling", "freeform shape design", "user sketch", "solid modelling", "sketch-based modeling system", "2d interface", "deformations", "reference plane assisted sketching interface", "editing operation", "cognition", "shape", "computational modeling", "interaction technique", "solid modeling", "surface reconstruction" ], "authors": [ { "name": "Kai Wang", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Hock-Soon Seah", "org": "" } ], "venue": "CW", "year": 2010 }, "r2VWb8oe": { "id": "r2VWb8oe", "title": "Robust surface reconstruction via dictionary learning", "abstract": "Surface reconstruction from point cloud is of great practical importance in computer graphics. Existing methods often realize reconstruction via a few phases with respective goals, whose integration may not give an optimal solution. In this paper, to avoid the inherent limitations of multi-phase processing in the prior art, we propose a unified framework that treats geometry and connectivity construction as one joint optimization problem. The framework is based on dictionary learning in which the dictionary consists of the vertices of the reconstructed triangular mesh and the sparse coding matrix encodes the connectivity of the mesh. The dictionary learning is formulated as a constrained ℓ2,q-optimization (0 < q < 1), aiming to find the vertex position and triangulation that minimize an energy function composed of point-to-mesh metric and regularization. Our formulation takes many factors into account within the same framework, including distance metric, noise/outlier resilience, sharp feature preservation, no need to estimate normal, etc., thus providing a global and robust algorithm that is able to efficiently recover a piecewise smooth surface from dense data points with imperfections. Extensive experiments using synthetic models, real world models, and publicly available benchmark show that our method outperforms the state-of-the-art in terms of accuracy, robustness to noise and outliers, geometric feature and detail preservation, and mesh connectivity.", "keywords": [ "point cloud", "dictionary learning", "sparse coding", "l", "computational geometry and object modeling", "surface reconstruction", "distance metric" ], "authors": [ { "name": "Shiyao Xiong", "org": "Univ Sci & Technol China, Hefei, Anhui, Peoples R China" }, { "name": "Juyong Zhang", "org": "Univ Sci & Technol China, Hefei, Anhui, Peoples R China" }, { "name": "Jianmin Zheng", "org": "Nanyang Technol Univ, Singapore, Singapore" }, { "name": "Jianfei Cai", "org": "Nanyang Technol Univ, Singapore, Singapore" }, { "name": "Ligang Liu", "org": "Univ Sci & Technol China, Hefei, Anhui, Peoples R China" } ], "venue": "ACM Trans. Graph.", "year": 2014 }, "QK9vVdYF": { "id": "QK9vVdYF", "title": "Multiple foreground recognition and cosegmentation: An object-oriented CRF model with robust higher-order potentials", "abstract": "Localizing, recognizing, and segmenting multiple foreground objects jointly from a general user's photo stream that records a specific event is an important task with many useful applications. As argued in recent Multiple Foreground Cosegmentation (MFC) work by Kim and Xing, this task is very challenging in that it contrasts substantially from the classical cosegmentation problem, and aims to parse a set of realistic event photos but each containing irregularly occurring multiple foregrounds with high appearance and scene configuration variations. Inspired by the impressive advance in scene understanding and object recognition, this paper casts the multiple foreground recognition and cosegmentation (MFRC) problem within a conditional random fields (CRFs) framework in a principled manner. We capitalize centrally on the key objective that MFRC is to segment out and annotate foreground objects or “things” rather than “stuff”. To this end, we exploit a few complementary objectness cues (e.g. contours, object detectors and layout) and propose novel and efficient methods to capture object-level information. Integrating object potentials as soft constraints (e.g. robust higher-order potentials defined over detected object regions) with low-level unary and pairwise terms holistically, we solve the MFRC task with a probabilistic CRF model. The inference for such a CRF model is performed efficiently with graph cut based move making algorithms. With a minimal amount of user annotations on just a few example photos, the proposed approach produces spatially coherent, boundary-aligned segmentation results with correct and consistent object labeling. Experiments on the FlickrMFC dataset justify that our method achieves state-of-the-art performance.", "keywords": [ "move making algorithms", "image segmentation", "robust higher-order potentials", "image recognition", "multiple foreground recognition", "graph cut", "flickrmfc dataset", "object-oriented programming", "object recognition", "graph theory", "object-oriented crf model", "conditional random fields", "object-level information", "multiple foreground cosegmentation", "robustness", "object oriented programming" ], "authors": [ { "name": "Hongyuan Zhu", "org": "" }, { "name": "Jiangbo Lu", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Nadia Magnenat-Thalmann", "org": "" } ], "venue": "WACV", "year": 2014 }, "LRwzMSjc": { "id": "LRwzMSjc", "title": "A Framework for GPU-accelerated Virtual Cardiac Intervention", "abstract": "Cardiovascular diseases is a major cause of deaths in many developed countries. To treat cardiovascular diseases, minimally invasive cardiac intervention is widely used as an effective yet complicated solution. Training of cardiac intervention thus plays a crucial role. This paper addresses the use of Virtual Reality (VR) technology for the simulated training of cardiac intervention. In particular, the paper describes the architecture of a simulation system for virtual cardiac intervention. The framework proposed consists of hardware component, software component and methodology component. As an enabling technology, Graphics Processing Unit (GPU) is applied in this work to enhance cardiac modeling, cardiac visualization, and cardiac interaction with the VR simulation environment.", "keywords": [ "index terms—vr environment", "architecture", "cardiac intervention.", "simulation", "gpu", "cause of death", "virtual reality", "indexing terms", "component software", "developing country" ], "authors": [ { "name": "Rongdong Yu", "org": "College of Life Science|Zhejiang University" }, { "name": "Patricia Chiang", "org": "School of Mechanical & Aerospace Engineering|Nanyang Technological University" }, { "name": "Wenyu Chen", "org": "School of Mechanical & Aerospace Engineering|Nanyang Technological University" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering|Nanyang Technological University" }, { "name": "Yiyu Cai", "org": "School of Mechanical & Aerospace Engineering|Nanyang Technological University" }, { "name": "Xiuzi Ye", "org": "College of Life Science|Zhejiang University" }, { "name": "Sanyuan Zhang", "org": "College of Computer Science|Zhejiang University" }, { "name": "Yin Zhang", "org": "College of Computer Science|Zhejiang University" }, { "name": "Koon-Hou Mak", "org": "Mak Heart Clinic" } ], "venue": "", "year": 2009 }, "5le1n9lu": { "id": "5le1n9lu", "title": "View-Based 3D Model Transmission via Mesh Segmentation", "abstract": "For network-based graphics applications, a key challenge is how to efficiently transmit complex three-dimensional (3D) models over bandwidth-limited communication channels such as wireless links. Most existing 3D mesh coding algorithms do not consider the view-dependent rendering issue, and therefore result in transmitting unnecessary portions of 3D mesh models which leads to the waste in precious network bandwidth. In this paper, we propose a novel view-dependent 3D model transmission scheme, where a 3D model is partitioned into a number of segments, each segment is then independently coded using the MPEG-4 3DMC coding algorithm, and finally only the visible segments are selected and delivered to the client. Such a view-based 3D model transmission is able to substantially save the transmission bandwidth and therefore has a significant impact on wireless network based graphics applications.", "keywords": [ "radio links", "bandwidth-limited communication channels", "mesh generation", "image segmentation", "computational geometry", "3d mesh coding algorithms", "rendering (computer graphics)", "wireless network-based graphics applications", "radio networks", "data visualisation", "video coding", "mesh segmentation", "wireless links", "solid modelling", "mpeg-4 3dmc coding algorithm", "view-based 3d model transmission", "view-dependent rendering", "multimedia communication", "three dimensional", "wireless network", "geometry", "surgery", "bandwidth", "topology", "communication channels", "application software", "computer graphics" ], "authors": [ { "name": "Wei Guan", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Chang Wen Chen", "org": "" } ], "venue": "ICME", "year": 2007 }, "ohJ5ba6G": { "id": "ohJ5ba6G", "title": "Local T-spline surface skinning", "abstract": "Skinning or lofting remains a challenging problem in computer graphics and free-form surface design. Although it was addressed by many researchers, no sufficiently general solution has been proposed yet. In the interpolating approach, the incompatibility of the input NURBS curves are solved by knot insertion. This process leads to an explosion in the number of control points defining the skinned surface. Other methods avoid this problem by generating skinned surfaces that approximate rather than interpolate the input curves. In this paper, we provide a solution to this problem using T-splines. Compared with existing approaches, a T-spline skinned surface interpolates a set of incompatible curves with a control mesh of fewer vertices. Typically, the linear system involved could be solved globally. However, our approach provides a local solution for each skinned curve. As such, local modification could be used to meet additional constraints such as given normal and/or predefined curvature across the skinned curves.", "keywords": [ "general solution", "local solution", "control point", "local t-spline surface skinning", "skinned surface", "skinned curve", "control mesh", "free-form surface design", "challenging problem", "t-spline skinned surface", "input nurbs curve" ], "authors": [ { "name": "Ahmad Nasri", "org": "American University of Beirut, ASHA Computer Graphics & Animation Lab., Department of Computer Science, Beirut, Lebanon" }, { "name": "Khaled Sinno", "org": "American University of Beirut, ASHA Computer Graphics & Animation Lab., Department of Computer Science, Beirut, Lebanon" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, School of Computer Engineering, Singapore, Singapore" } ], "venue": "The Visual Computer", "year": 2012 }, "TTTXZWVX": { "id": "TTTXZWVX", "title": "A B-spline approach to phase unwrapping in tagged cardiac MRI for motion tracking.", "abstract": "A novel B-Spline based approach to phase unwrapping in tagged magnetic resonance images is proposed for cardiac motion tracking. A bicubic B-spline surface is used to model the absolute phase. The phase unwrapping problem is formulated as a mixed integer optimization problem that minimizes the sum of the difference between the spatial gradients of absolute and wrapped phases, and the difference between the rewrapped and wrapped phases. In contrast to the existing techniques for motion tracking, the proposed approach can overcome the limitation of interframe half-tag displacement and increase the robustness of motion tracking. The article further presents a hybrid harmonic phase imaging-B-spline method to take the advantage of the harmonic phase imaging method for small motion and the efficiency of the B-Spline approach for large motion. The proposed approach has been successively applied to a full set of cardiac MRI scans in both long and short axis slices with superior performance when compared with the harmonic phase imaging and quality guided path-following methods.", "keywords": [ "motion tracking", "b spline", "magnetic resonance imaging" ], "authors": [ { "name": "Patricia Chiang", "org": "School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore." }, { "name": "Yiyu Cai", "org": "" }, { "name": "Koon Hou Mak", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Magnetic resonance in medicine", "year": 2013 }, "EmTpqekE": { "id": "EmTpqekE", "title": "Teaching Quality Management Model for the Training of Innovation Ability and the Multilevel Decomposition Indicators", "abstract": "", "keywords": [], "authors": [ { "name": "xingjiang lu", "org": "" }, { "name": "chen yao", "org": "zhejiang university" }, { "name": "jianmin zheng", "org": "nanyang technological university" } ], "venue": "", "year": 2013 }, "OZphSkMS": { "id": "OZphSkMS", "title": "Design of a Highly Biomimetic and Fully-Actuated Robotic Finger.", "abstract": "During design a mechanical structure such as a robotic finger, modeling parts and designing joints are two timeconsuming steps. This paper presents a method for design and fabrication of a humanoid robotic finger that intends to mimic the human finger in terms of tendon, bones, ligaments and the pulley systems which aims to generate a mechanism rapidly. The method is inspired by the anatomy and biomechanics of human hand, and focuses on bones, joints and actuation systems, with the aim of creating a customised finger that has the similar degrees of freedom and ranges of motion of a human finger. Specifically, we propose to create the personalised 3D models of finger’s bones by adapting a template to the data acquired by scanning the real hand, which are then fabricated by 3D printing. Low cost and easy-to-get materials such as Nylon cables and silicon rubber are used to build the tendon sheaths and the joints. We design a \"3 layer cascade cable driven system\" built upon eight driven cables and four servo motors for simulating all possible four Degree of Freedom (DOF) of the finger. As a result, we present a highly biomimetic and fully-actuated robotic finger, which can achieve more DOFs and larger ranges of motion compared to existing humanoid robotic hands. Particularly, the experiments validate that our robotic finger is capable of achieving all 11 standard finger gestures as a human finger.", "keywords": "", "authors": [ { "name": "Li Tian", "org": "Nanyang Technological University, Singapore;" }, { "name": "Nadia Magnenat-Thalmann", "org": "Nanyang Technological University, Singapore;" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore;" }, { "name": "Daniel Thalmann", "org": "EPFL IC-DO,Lausanne,Switzerland,CH-1015" } ], "venue": "SSCI", "year": 2019 }, "0z7F8mCe": { "id": "0z7F8mCe", "title": "Triangular mesh deformation via edge-based graph", "abstract": "", "keywords": [], "authors": [ { "name": "jianmin zheng", "org": "" }, { "name": "kai wang", "org": "" }, { "name": "yuewen ma", "org": "" }, { "name": "hock soon seah", "org": "" } ], "venue": "Computer-aided Design and Applications", "year": 2012 }, "67jByfpQ": { "id": "67jByfpQ", "title": "Constructing Triangular Meshes of Minimal Area", "abstract": "", "keywords": [ "plateau problem", "geometric modeling", "triangular mesh", "minimal surfaces" ], "authors": [ { "name": "wenyu chen", "org": "" }, { "name": "yiyu cai", "org": "" }, { "name": "jianmin zheng", "org": "" } ], "venue": "Computer-aided Design and Applications", "year": 2008 }, "zK5b76cG": { "id": "zK5b76cG", "title": "Reconsideration of T-spline data models and their exchanges using STEP.", "abstract": "T-spline is a new approach to define freeform surfaces with relatively less control points than NURBS and is able to represent a model using a single surface without joining errors. Whereas, the complexity of T-spline data models leads numerous difficulties in its programming, which hinders the research and development of T-spline technologies. In addition, the data exchange of T-spline models still remains on a primitive level, and no standardized data format has been published so far. This article gives a reconsideration to the existing T-spline definitions, and proposes a set of redesigned data models which have much more understanding conveniences to both human and computer. Moreover, STEP-compliant data models are designed using the proposed T-spline models to standardize their data exchange between different CAx systems. The combination of T-spline with other product models in ISO 10303 makes it convenient to exchange the versatile resource data in a hybrid neutral file. A prototype system is developed for the validation purpose, which consists of a TSM-to-STEP convertor, a STEP parser and a T-spline kernel. Using the developed prototype system, one can automatically convert a Rhino system exported TSM file to a STEP file in the P21 format, which can be then parsed using the STEP reader and processed by the T-spline kernel. Some testing examples show that the proposed data models are much more efficient in processing and exchanging the T-spline data. The drawbacks of the existing T-spline definitions are discussed and remedied using the redesigned T-spline data models.Some characteristics of the new T-spline data models are investigated and evaluated.The STEP-compliant data models based on the new T-spline definitions are proposed for data exchanges between different CAx systems.A prototype system is developed to test the T-spline data models and exchanges.", "keywords": "", "authors": [ { "name": "Wenlei Xiao", "org": "" }, { "name": "Yazui Liu", "org": "" }, { "name": "Rui Li", "org": "" }, { "name": "Wei Wang", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Gang Zhao", "org": "" } ], "venue": "Computer-Aided Design", "year": 2016 }, "BjTO0gpk": { "id": "BjTO0gpk", "title": "Efficient terrain triangulation and modification algorithms for game applications", "abstract": "An efficient terrain generation algorithm is developed, based on constrained conforming Delaunay triangulation. The density of triangulation in different regions of a terrain is determined by its flatness, as seen from a height map, and a control map. Tracks and other objects found in a game world can be applied over the terrain using the \"stenciling\" and \"stitching\" algorithms. Using user controlled parameters, varying levels of detail can be preserved when applying these objects over the terrain as well. The algorithms have been incorporated into 3dsMax as plugins, and the experimental results demonstrate the usefulness and efficiency of the developed algorithms.", "keywords": [ "game world", "developed algorithm", "delaunay triangulation", "efficient terrain triangulation", "different region", "modification algorithm", "efficient terrain generation algorithm", "control map", "game application", "varying level", "height map" ], "authors": [ { "name": "Sundar Raman", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Zheng Jianmin", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" } ], "venue": "Int. J. Computer Games Technology", "year": 2008 }, "R7T3Gc2c": { "id": "R7T3Gc2c", "title": "Curvature-guided adaptive T-spline surface fitting", "abstract": "The problem of fitting spline surfaces to triangular mesh models is of importance in computer-aided design. Many fitting algorithms have been developed. This paper proposes several novel plug-and-play components or strategies: the use of T-splines for fitting, a curvature-guided strategy, faithful re-parameterization and initial spline knot re-placement, which can be used to enhance fitting algorithms. We also present an adaptive T-spline fitting algorithm integrating these components and strategies. Extensive experiments have been conducted to demonstrate these components. Our fitting algorithm can generate spline surfaces that well respect the geometrical features of input mesh models and have a more compact representation.", "keywords": [ "adaptive t-spline fitting algorithm", "input mesh model", "spline surface", "curvature-guided strategy", "mesh model", "curvature-guided adaptive t-spline surface", "initial spline knot re-placement", "fitting algorithm", "fitting spline surface", "compact representation", "computer-aided design", "t", "curvature", "t splines" ], "authors": [ { "name": "Yimin Wang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Computer-Aided Design", "year": 2013 }, "Y7tfU6YB": { "id": "Y7tfU6YB", "title": "Approximate R3-spline surface skinning.", "abstract": "", "keywords": [], "authors": [ { "name": "Xunnian Yang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "Computer-Aided Design", "year": 2012 }, "qOqe865g": { "id": "qOqe865g", "title": "Shading-Based Surface Detail Recovery Under General Unknown Illumination.", "abstract": "Reconstructing the shape of a 3D object from multi-view images under unknown, general illumination is a fundamental problem in computer vision. High quality reconstruction is usually challenging especially when fine detail is needed and the albedo of the object is non-uniform. This paper introduces vertex overall illumination vectors to model the illumination effect and presents a total variation ...", "keywords": [ "Lighting", "Surface reconstruction", "Image reconstruction", "Shape", "Geometry", "Three-dimensional displays", "Surface treatment" ], "authors": [ { "name": "Di Xu", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore" }, { "name": "Qi Duan", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore" }, { "name": "Juyong Zhang", "org": "University of Science and Technology of China, Hefei, Anhui, China" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore" }, { "name": "Tat-Jen Cham", "org": "Nanyang Technological University, 50 Nanyang Ave, Singapore" } ], "venue": "IEEE Transactions on Pattern Analysis and Machine Intelligence", "year": 2018 }, "wMv6H7ZI": { "id": "wMv6H7ZI", "title": "A Direct Approach to Computing the µ-basis of Planar Rational Curves", "abstract": "", "keywords": [], "authors": [ { "name": "Jianmin Zheng", "org": "" }, { "name": "Thomas W. Sederberg", "org": "" } ], "venue": "J. Symb. Comput.", "year": 2001 }, "HmCj5dFa": { "id": "HmCj5dFa", "title": "OVIE: Object Oriented and Vector based Image Editing", "abstract": "A powerful image editing system called OVIE is described, which provides fast and accurate creation, composition, rendering and other manipulation of image contents. Flexibility and convenience of the system are achieved by including two modules: image decomposition and image vectorization to understand and represent an image respectively. To understand an image comprehensively, we propose to integrate image segmentation, shape completion and image completion techniques to ensure a seamless image editing. An array of pixels is replaced by vector data with geometric edit ability for image representation since the geometrically-based editing has physical meanings and thus it is more natural or intuitive for users to edit. Compared to the existing works, our system is more convenient and can generate effects with higher quality.", "keywords": [ "image vectorization", "geometrically-based editing", "powerful image editing system", "object oriented", "seamless image editing", "image content", "image editing", "image decomposition", "image representation", "image comprehensively", "image completion technique", "image segmentation", "shape", "vectors", "geometry" ], "authors": [ { "name": "Hailing Zhou", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Lei Wei", "org": "" } ], "venue": "ICME Workshops", "year": 2012 }, "zoLx1uBV": { "id": "zoLx1uBV", "title": "Modeling Personality, Mood, and Emotions", "abstract": "", "keywords": [], "authors": [ { "name": "juzheng zhang", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" }, { "name": "nadia magnenatthalmann", "org": "nanyang technological university" } ], "venue": "Context Aware Human-Robot and Human-Agent Interaction", "year": 2016 }, "tCTWAkDN": { "id": "tCTWAkDN", "title": "Shape aware normal interpolation for curved surface shading from polyhedral approximation", "abstract": "Independent interpolation of local surface patches and local normal patches is an efficient way for fast rendering of smooth curved surfaces from rough polyhedral meshes. However, the independently interpolating normals may deviate greatly from the analytical normals of local interpolating surfaces, and the normal deviation may cause severe rendering defects when the surface is shaded using the interpolating normals. In this paper we propose two novel normal interpolation schemes along with interpolation of cubic B茅zier triangles for rendering curved surfaces from rough triangular meshes. Firstly, the interpolating normal is computed by a Gregory normal patch to each B茅zier triangle by a new definition of quadratic normal functions along cubic space curves. Secondly, the interpolating normal is obtained by blending side-vertex normal functions along side-vertex parametric curves of the interpolating B茅zier surface. The normal patches by these two methods can not only interpolate given normals at vertices or boundaries of a triangle but also match the shape of the local interpolating surface very well. As a result, more realistic shading results are obtained by either of the two new normal interpolation schemes than by the traditional quadratic normal interpolation method for rendering rough triangular meshes.", "keywords": [ "novel normal interpolation scheme", "interpolating normal", "local normal patch", "curved surface", "local interpolating surface", "polyhedral approximation", "aware normal interpolation", "quadratic normal function", "new normal interpolation scheme", "normal patch", "normal deviation", "analytical normal", "gregory normal patch" ], "authors": [ { "name": "Xunnian Yang", "org": "Department of Mathematics, Zhejiang University, Hangzhou, China" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore, Singapore" } ], "venue": "The Visual Computer", "year": 2013 }, "RgYbK4wW": { "id": "RgYbK4wW", "title": "CNN-based Real-time Dense Face Reconstruction with Inverse-rendered Photo-realistic Face Images.", "abstract": "With the powerfulness of convolution neural networks (CNN), CNN based face reconstruction has recently shown promising performance in reconstructing detailed face shape from 2D face images. The success of CNN-based methods relies on a large number of labeled data. The state-of-the-art synthesizes such data using a coarse morphable face model, which however has difficulty to generate detailed photo-realistic images of faces (with wrinkles). This paper presents a novel face data generation method. Specifically, we render a large number of photo-realistic face images with different attributes based on inverse rendering. Furthermore, we construct a fine-detailed face image dataset by transferring different scales of details from one image to another. We also construct a large number of video-type adjacent frame pairs by simulating the distribution of real video data. With these nicely constructed datasets, we propose a coarse-to-fine learning framework consisting of three convolutional networks. The networks are trained for real-time detailed 3D face reconstruction from monocular video as well as from a single image. Extensive experimental results demonstrate that our framework can produce high-quality reconstruction but with much less computation time compared to the state-of-the-art. Moreover, our method is robust to pose, expression and lighting due to the diversity of data.", "keywords": [ "Face", "Image reconstruction", "Three-dimensional displays", "Rendering (computer graphics)", "Geometry", "Solid modeling", "Real-time systems" ], "authors": [ { "name": "Yudong Guo", "org": "Mathematical Sciences, University of Science and Technology of China, Hefei, Anhui China (e-mail: gyd2011@mail.ustc.edu.cn)" }, { "name": "Juyong Zhang", "org": "Mathematical Sciences, University of Science and Technology of China, Hefei, Anhui China (e-mail: juyong@ustc.edu.cn)" }, { "name": "Jianfei Cai", "org": "School of Computer Engineering, Nanyang Technological University, Singapore, Singapore Singapore (e-mail: asjfcai@ntu.edu.sg)" }, { "name": "Boyi Jiang", "org": "Mathematical Sciences, University of Science and Technology of China, Hefei, Anhui China (e-mail: jby1993@mail.ustc.edu.cn)" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore, Singapore Singapore 639798 (e-mail: asjmzheng@ntu.edu.sg)" } ], "venue": "IEEE transactions on pattern analysis and machine intelligence", "year": 2018 }, "oNE3k6wv": { "id": "oNE3k6wv", "title": "C1 NURBS representations of G1 composite rational Bézier curves", "abstract": "This paper is concerned with the re-representation of a G\n 1 composite rational Bézier curve. Although the rational Bézier curve segments that form the composite curve are G\n 1 continuous at their joint points, their homogeneous representations may not be even C\n 0 continuous in the homogeneous space. In this paper, an algorithm is presented to convert the G\n 1 composite rational Bézier curve into a NURBS curve whose nonrational homogeneous representation is C\n 1 continuous in the homogeneous space. This re-representation process involves reparameterization using Möbius transformations,\n smoothing multiplication and parameter scaling transformations. While the previous methods may fail in some situations, the\n method proposed in this paper always works.", "keywords": [ "piecewise rational bézier curves · c 1 continuity · nurbs ·" ], "authors": [ { "name": "Jianmin Zheng", "org": "Nanyang Technological University School of Computer Engineering Singapore Singapore" } ], "venue": "Computing", "year": 2009 }, "LCaq8Zt9": { "id": "LCaq8Zt9", "title": "3DFaceNet: Real-time Dense Face Reconstruction via Synthesizing Photo-realistic Face Images", "abstract": "With the powerfulness of convolution neural networks (CNN), CNN based face reconstruction has recently shown promising performance in reconstructing detailed face shape from 2D face images. The success of CNN-based methods relies on a large number of labeled data. The state-of-the-art synthesizes such data using a coarse morphable face model, which however has difficulty to generate detailed photo-realistic images of faces (with wrinkles). This paper presents a novel face data generation method. Specifically, we render a large number of photo-realistic face images with different attributes based on inverse rendering. Furthermore, we construct a fine-detailed face image dataset by transferring different scales of details from one image to another. We also construct a large number of video-type adjacent frame pairs by simulating the distribution of real video data. With these nicely constructed datasets, we propose a coarse-to-fine learning framework consisting of three convolutional networks. The networks are trained for real-time detailed 3D face reconstruction from monocular video as well as from a single image. Extensive experimental results demonstrate that our framework can produce high-quality reconstruction but with much less computation time compared to the state-of-the-art. Moreover, our method is robust to pose, expression and lighting due to the diversity of data.", "keywords": "", "authors": [ { "name": "Yudong Guo", "org": "" }, { "name": "Juyong Zhang", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Boyi Jiang", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "arXiv: Computer Vision and Pattern Recognition", "year": 2017 }, "mItX93me": { "id": "mItX93me", "title": "SubdSH - Subdivision-based Spherical Harmonics Field for Real-time Shading-based Refinement under Challenging Unknown Illumination.", "abstract": "This paper presents a spatial-varying illumination model for shading-based depth refinement that based on a smooth Spherical Harmonics (SH) lighting field. The proposed lighting model is able to recover shading under challenging unknown lighting conditions, thus improving the quality of recovered surface detail. To avoid over-parameterization, local lighting coefficients are treated as a vector-valued function which is represented by subdivided surfaces using Catmull-Clark subdivision. We solve our lighting model utilizing a highly parallelized scheme that recovers lighting in a few milliseconds. A real-time shading-based depth recovery system is implemented with the integration of our proposed lighting model. We conduct quantitative and qualitative evaluations on both synthetic and real world datasets under challenging illumination. The experimental results show our method outperforms the state-of-the-art real-time shading-based depth refinement system.", "keywords": "", "authors": [ { "name": "Teng Deng", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Tat-Jen Cham", "org": "" } ], "venue": "VCIP", "year": 2018 }, "96I5nYqh": { "id": "96I5nYqh", "title": "Texture aware image segmentation using graph cuts and active contours", "abstract": "The problem of segmenting a foreground object out from its complex background is of great interest in image processing and computer vision. Many interactive segmentation algorithms such as graph cut have been successfully developed. In this paper, we present four technical components to improve graph cut based algorithms, which are combining both color and texture information for graph cut, including structure tensors in the graph cut model, incorporating active contours into the segmentation process, and using a ''softbrush'' tool to impose soft constraints to refine problematic boundaries. The integration of these components provides an interactive segmentation method that overcomes the difficulties of previous segmentation algorithms in handling images containing textures or low contrast boundaries and producing a smooth and accurate segmentation boundary. Experiments on various images from the Brodatz, Berkeley and MSRC data sets are conducted and the experimental results demonstrate the high effectiveness of the proposed method to a wide range of images.", "keywords": [ "accurate segmentation boundary", "interactive segmentation", "texture aware image segmentation", "graph cut model", "previous segmentation algorithm", "msrc data set", "segmentation process", "interactive segmentation method", "graph cut", "active contour", "structure tensor" ], "authors": [ { "name": "Hailing Zhou", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Lei Wei", "org": "Centre for Intelligent Systems Research, Deakin University, Victoria, Australia" } ], "venue": "Pattern Recognition", "year": 2013 }, "MVwrc55N": { "id": "MVwrc55N", "title": "Recovering facial reflectance and geometry from multi-view images", "abstract": " While the problem of estimating shapes and diffuse reflectances of human faces from images has been extensively studied, there is relatively less work done on recovering the specular albedo. This paper presents a lightweight solution for inferring photorealistic facial reflectance and geometry. Our system processes video streams from two views of a subject, and outputs two reflectance maps for diffuse and specular albedos, as well as a vector map of surface normals. A model-based optimization approach is used, consisting of the three stages of multi-view face model fitting, facial reflectance inference and facial geometry refinement. Our approach is based on a novel formulation built upon the 3D morphable model (3DMM) for representing 3D textured faces in conjunction with the Blinn-Phong reflection model. It has the advantage of requiring only a simple setup with two video streams, and is able to exploit the interaction between the diffuse and specular reflections across multiple views as well as time frames. As a result, the method is able to reliably recover high-fidelity facial reflectance and geometry, which facilitates various applications such as generating photorealistic facial images under new viewpoints or illumination conditions. ", "keywords": "", "authors": [ { "name": "Guoxian Song", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Tat-Jen Cham", "org": "" } ], "venue": "Image Vis. Comput.", "year": 2020 }, "biZEbRFD": { "id": "biZEbRFD", "title": "Technical Section: Euler arc splines for curve completion", "abstract": "This paper introduces a special arc spline called an Euler arc spline as the basic form for visually pleasing completion curves. It is considered as an extension of an Euler curve in the sense that the points in the Euler curve are replaced by arcs. A simple way for specifying it, which is suitable for shape completion, is presented. It is shown that Euler arc splines have several properties desired by aesthetics of curves, in addition to computational simplicity and NURBS representation. An algorithm is proposed for curve completion using Euler arc splines. The development of the algorithm involves two optimization processes, which are converted into a single minimization problem in two variables solved by the Levenberg-Marquardt algorithm. Compared to previous methods, the proposed algorithm always guarantees the interpolation of two boundary conditions.", "keywords": [ "Euler curve", "curve completion", "Euler arc spline", "Levenberg-Marquardt algorithm", "basic form", "shape completion", "pleasing completion curve", "Technical Section", "proposed algorithm", "NURBS representation", "special arc spline" ], "authors": [ { "name": "Hailing Zhou", "org": "School of Computer Engineering, Nanyang Technological University, Nanyang Avenue, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Nanyang Avenue, Singapore" }, { "name": "Xunnian Yang", "org": "Mathematics Department, Zhejiang University, Hangzhou, China" } ], "venue": "Computers and Graphics", "year": 2012 }, "18ieJbdf": { "id": "18ieJbdf", "title": "Combining Memory and Emotion With Dialog on Social Companion: A Review.", "abstract": "In the coming era of social companions, many researches have been pursuing natural dialog interactions and long-term relations between social companions and users. With respect to the quick decrease of user interests after the first few interactions, various emotion and memory models are developed and integrated with social companions for better user engagement. This paper reviews related works in the effort of combining memory and emotion with natural language dialog on social companions. We separate these works into three categories: (1) Affective system with dialog, (2) Task-driven memory with dialog, (3) Chat-driven memory with dialog. In addition, we discussed limitations and challenging issues to be solved. Finally, we also introduced our framework of social companions.", "keywords": "", "authors": [ { "name": "Juzheng Zhang", "org": "" }, { "name": "Nadia Magnenat-Thalmann", "org": "" }, { "name": "Jianmin Zheng", "org": "" } ], "venue": "CASA", "year": 2016 }, "IhTYpbU0": { "id": "IhTYpbU0", "title": "An alternative method for constructing interpolatory subdivision from approximating subdivision", "abstract": "This paper presents a new perspective for constructing interpolatory subdivision from primal approximating subdivision. The basic idea is constructing the subdivision rule for new inserted vertices of a new interpolatory subdivision scheme based on an approximating subdivision algorithm applied to a local configuration of the mesh with one vertex updated for interpolation of the vertex. This idea is demonstrated by presenting two new interpolatory subdivision schemes based on Catmull-Clark subdivision for an arbitrary polygonal mesh and Loop subdivision for a triangular mesh, respectively. These algorithms are simple and have a small stencil for computing new points. The new perspective also shows a link between those classic approximating and interpolatory subdivision algorithms such as cubic B-spline curve subdivision and the four-point interpolatory subdivision, Catmull-Clark subdivision and Kobbelt@?s interpolatory scheme, and Loop subdivision and the butterfly algorithm.", "keywords": [ "loop subdivision", "four-point interpolatory subdivision", "primal approximating subdivision", "catmull-clark subdivision", "new perspective", "approximating subdivision algorithm", "alternative method", "cubic b-spline curve subdivision", "subdivision rule", "new interpolatory subdivision scheme", "interpolatory subdivision", "geometric modeling" ], "authors": [ { "name": "Xin Li", "org": "Department of Mathematics, University of Science and Technology of China, Hefei, Anhui, PR China" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, N4, #02a-32, Nanyang Avenue, Singapore 639798, Singapore" } ], "venue": "Computer Aided Geometric Design", "year": 2012 }, "QBIhZmMi": { "id": "QBIhZmMi", "title": "Salient object cutout using Google images", "abstract": "Given any image input by users, how to automatically cutout the object-of-interest is a challenging problem due to lack of information of the object-of-interest and the background. Saliency detection techniques are able to provide some rough information about object-of-interest since they highlight high-contrast or high attention regions or pixels. However, the generated saliency map is often noisy and directly applying it for segmentation often leads to erroneous results. Motivated by the recent progress on image co-segmentation and internet image retrieval techniques, in this paper, we propose to use the user input image for segmentation as a query image to Google Images and then employ the top returned Google images to build up the knowledge about the object-of-interest in the user input image. Particularly, we develop a lightweight algorithm to learn the knowledge of the object-of-interest in the retrieved images to enhance the saliency map of the input image. Then, the enhanced saliency map is used to initialize the graph-cut to extract the object-of-interest. Experiments with the Mcgill dataset and multiple challenge cases demonstrate the effectiveness of our method in terms of producing a clean cutout.", "keywords": [ "google images", "image segmentation", "saliency map", "lightweight algorithm", "object-of-interest", "graph cut", "image retrieval", "internet", "saliency detection techniques", "object detection", "image cosegmentation", "graph theory", "salient object cutout", "rough information", "internet image retrieval techniques", "histograms" ], "authors": [ { "name": "Hongyuan Zhu", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Jianxin Wu", "org": "" }, { "name": "Nadia Magnenat-Thalmann", "org": "" } ], "venue": "ISCAS", "year": 2013 }, "5LOjA7aR": { "id": "5LOjA7aR", "title": "Interactive object segmentation from multi-view images", "abstract": "Despite the great progress on interactive image segmentation, image co-segmentation, 2D and 3D segmentation, there is still no workable solution to the problem: given a set of calibrated or un-calibrated multi-view images (say, more than 40 images), by interactively cutting 3~4 images, can the foreground object of the rest images be quickly cutout automatically and accurately? In this paper, we propose a non-trivial engineering solution to this problem. Our basic idea is to integrate 3D segmentation with 2D segmentation so as to combine their advantages. Our proposed system iteratively performs 2D and 3D segmentation, where the 3D segmentation results are used to initialize 2D segmentation and ensure the silhouette consistency among different views and the 2D segmentation results are used to provide more accurate cues for the 3D segmentation. The experimental results show that the proposed system is able to generate highly accurate segmentation results, even for some challenging real-world multi-view image sequences, with a small amount of user input.", "keywords": [ "non-trivial engineering solution", "rest image", "un-calibrated multi-view image", "accurate segmentation result", "interactive image segmentation", "accurate cue", "image co-segmentation", "proposed system", "segmentation result", "interactive object segmentation", "challenging real-world multi-view image", "image segmentation", "active contour" ], "authors": [ { "name": "Thi Nhat Anh Nguyen", "org": "Danang University of Technology, Vietnam" }, { "name": "Jianfei Cai", "org": "School of Computer Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Jianguo Li", "org": "Intel Labs China" } ], "venue": "J. Visual Communication and Image Representation", "year": 2013 }, "cTasgYIr": { "id": "cTasgYIr", "title": "Kernel modeling for molecular surfaces using a uniform solution", "abstract": "In this paper, a rational Bezier surface is proposed as a uniform approach to modeling all three types of molecular surfaces (MS): the van der Waals surface (vdWS), solvent accessible surface (SAS) and solvent excluded surface (SES). Each molecular surface can be divided into molecular patches, which can be defined by their boundary arcs. The solution consists of three steps: topology modeling, boundary modeling and surface modeling. Firstly, using a weighted @a-shape, topology modeling creates two networks to describe the neighboring relationship of the molecular atoms. Secondly, boundary modeling derives all boundary arcs from the networks. Thirdly, surface modeling constructs all three types of molecular surfaces patch-by-patch, based on the networks and the boundary arcs. For an SES, the singularity is specially treated to avoid self-intersections. Instead of approximation, this proposed solution can produce precise shapes of molecular surfaces. Since rational Bezier representation is much simpler than a trimmed non-uniform rational B-spline surface (NURBS), computational load can be significantly saved when dealing with molecular surfaces. It is also possible to utilize the hardware acceleration for tessellation and rendering of a rational Bezier surface. CAGD kernel modelers typically use NURBSs as a uniform representation to handle different types of free-form surface. This research indicates that rational Bezier representation, more specifically, a bi-cubic or 2x4 rational Bezier surface, is sufficient for kernel modeling of molecular surfaces and related applications.", "keywords": [ "singularity", "uniform solution", "solvent accessible surface", "free-form surface", "saddle patches", "rational bézier surface", "spherical patches", "weighted α -shape", "rational bezier surface", "topology modeling", "rational bezier representation", "boundary arc", "surface modeling", "boundary modeling", "kernel modeling", "molecular surfaces", "molecular surface", "non-uniform rational b-spline surface", "hardware accelerator", "van der waals" ], "authors": [ { "name": "Wenyu Chen", "org": "School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore and Bio-Informatics Research Center, Nanyang Technological University ..." }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore" }, { "name": "Yiyu Cai", "org": "School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore and Bio-Informatics Research Center, Nanyang Technological University ..." } ], "venue": "Computer-Aided Design", "year": 2010 }, "ACKIVhJI": { "id": "ACKIVhJI", "title": "Compressive environment matting.", "abstract": "The existing high-quality environment matting methods usually require the capturing of a few thousand sample images and spend a few hours in data acquisition. In this paper, a novel environment matting algorithm is proposed to capture and extract the environment matte data effectively and efficiently. First, the recently developed compressive sensing theory is incorporated to reformulate the environment matting problem and simplify the data acquisition process. Next, taking into account the special properties of light refraction and reflection effects of transparent objects, two advanced priors, group clustering and Gaussian priors, as well as other basic constraints are introduced during the matte data recovery process to combat with the limited image samples, suppress the effects of the measurement noise resulted from data acquisition, and faithfully recover the sparse environment matte data. Compared with most of the existing environment matting methods, our algorithm significantly simplifies and accelerates the environment matting extraction process while still achieving high-accurate composition results.", "keywords": [ "Picture/image generation", " Modeling and recovery of physical attributes" ], "authors": [ { "name": "Qi Duan", "org": "School of Computer Engineering,Nanyang Technological University,Singapore,Singapore" }, { "name": "Jianfei Cai", "org": "School of Computer Engineering,Nanyang Technological University,Singapore,Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering,Nanyang Technological University,Singapore,Singapore" } ], "venue": "The Visual Computer", "year": 2015 }, "h6e5Cj1o": { "id": "h6e5Cj1o", "title": "Re-examination of applying wavelet based progressive image coder for 3D semi-regular mesh compression", "abstract": "ABSTRACT The latest wavelet based 3D mesh coding schemes,convert an irregular mesh,into a semi-regular mesh,and directly apply the zerotree-like image coders to compress,the wavelet vec- tors generated in the remeshing,process. The major problem of such type of approaches is that the particular properties of semi-regular meshes are not being considered in the zerotree- like image coders. In this paper, we propose an improved wavelet based 3D mesh coder. The basic idea is to introduce a preprocessing step to scale up the vector wavelets generated in remeshing so that the inherent dependency,of wavelets can be truly understood by the zerotree-like image compression algorithms. The weights used in the scaling process are care- fully designed through thoroughly analyzing the distortions of wavelets at different refinement levels. Experimental re - sults show that our proposed mesh coder significantly outper - forms the state-of-the-art wavelet based 3D mesh,compres- sion scheme.", "keywords": [ "solid modeling", "wavelet transforms", "data compression", "image reconstruction", "image compression" ], "authors": [ { "name": "Juyong Zhang", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Wei Guan", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Susanto Rahardja", "org": "" } ], "venue": "ICME", "year": 2008 }, "lwIF4pPJ": { "id": "lwIF4pPJ", "title": "Robust Interactive Image Segmentation Using Convex Active Contours.", "abstract": "The state-of-the-art interactive image segmentation algorithms are sensitive to the user inputs and often unable to produce an accurate boundary with a small amount of user interaction. They frequently rely on laborious user editing to refine the segmentation boundary. In this paper, we propose a robust and accurate interactive method based on the recently developed continuous-domain convex active contour model. The proposed method exhibits many desirable properties of an effective interactive image segmentation algorithm, including robustness to user inputs and different initializations, the ability to produce a smooth and accurate boundary contour, and the ability to handle topology changes. Experimental results on a benchmark data set show that the proposed tool is highly effective and outperforms the state-of-the-art interactive image segmentation algorithms.", "keywords": [ "robustness", "image segmentation", "convergence" ], "authors": [ { "name": "Nguyen Thi Nhat Anh", "org": "Danang University of Technology, Da Nang, Vietnam" }, { "name": "Jianfei Cai", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Juyong Zhang", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore" } ], "venue": "IEEE Transactions on Image Processing", "year": 2012 }, "Q4G9clai": { "id": "Q4G9clai", "title": "Including and optimizing shape parameters in Doo-Sabin subdivision surfaces for interpolation", "abstract": "This paper considers the problems of how to introduce shape parameters into recursive subdivision schemes for additional shape control and how to find appropriate values of shape parameters to improve the quality of subdivision surface shapes. Following Brunet, we restrict our discussion to the algorithm that constructs a Doo-Sabin subdivision surface to interpolate the vertices of an input polyhedron with arbitrary topology. While Brunet defined one so-called \"shape handle\" for each vertex of the initial polyhedron, which is used to scale the type-V face obtained after the first step of the subdivision process, we introduce three shape parameters for each vertex: one for the scale and the other two for the orientation of the type-V face. This gives more degrees of freedom to optimize the shape of the result interpolatory surface. We develop a genetic algorithm to compute the optimal set of shape parameters such that a \"fairness\" measure of the surface is minimized. Examples are provided to demonstrate the effects of the optimal shape parameters on the final interpolatory surfaces.", "keywords": [ "optimal shape parameter", "doo-sabin subdivision surface", "optimizing shape parameter", "subdivision process", "type-v face", "recursive subdivision scheme", "additional shape control", "subdivision surface shape", "shape parameter", "result interpolatory surface", "final interpolatory surface", "geometric model", "subdivision surface", "degree of freedom", "genetic algorithm", "subdivision surfaces", "interpolation", "geometric modeling", "optimization" ], "authors": [ { "name": "Wei Guan", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Singapore" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University, Singapore" } ], "venue": "Symposium on Solid and Physical Modeling", "year": 2007 }, "HY64LQ3W": { "id": "HY64LQ3W", "title": "Object Grasping of Humanoid Robot Based on YOLO.", "abstract": "This paper presents a system that aims to achieve autonomous grasping for micro-controller based humanoid robots such as the Inmoov robot [1]. The system consists of a visual sensor, a central controller and a manipulator. We modify the open sourced objection detection software YOLO (You Only Look Once) v2 [2] and associate it with the visual sensor to make the sensor be able to detect not only the category of the target object but also the location with the help of a depth camera. We also estimate the dimensions (i.e., the height and width) of the target based on the bounding box technique (Fig. 1). After that, we send the information to the central controller (a humanoid robot), which controls the manipulator (customised robotic hand) to grasp the object with the help of inverse kinematics theory. We conduct experiments to test our method with the Inmoov robot. The experiments show that our method is capable of detecting the object and driving the robotic hands to grasp the target object.", "keywords": [ "Robotics", "Vision", "Object detection", "Motion control", "Grasping" ], "authors": [ { "name": "Li Tian", "org": "Nanyang Technol Univ, Singapore, Singapore" }, { "name": "Nadia Magnenat-Thalmann", "org": "Nanyang Technol Univ, Singapore, Singapore" }, { "name": "Daniel Thalmann", "org": "Ecole Polytech Fed Lausanne, Lausanne, Switzerland" }, { "name": "Zhiwen Fang", "org": "ASTAR, Singapore, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technol Univ, Singapore, Singapore" } ], "venue": "ADVANCES IN COMPUTER GRAPHICS, CGI 2019", "year": 2019 }, "0uA2yZ6u": { "id": "0uA2yZ6u", "title": "Kinect Depth Recovery Using a Color-Guided, Region-Adaptive, and Depth-Selective Framework", "abstract": "Considering that the existing depth recovery approaches have different limitations when applied to Kinect depth data, in this article, we propose to integrate their effective features including adaptive support region selection, reliable depth selection, and color guidance together under an optimization framework for Kinect depth recovery. In particular, we formulate our depth recovery as an energy minimization problem, which solves the depth hole filling and denoising simultaneously. The energy function consists of a fidelity term and a regularization term, which are designed according to the Kinect characteristics. Our framework inherits and improves the idea of guided filtering by incorporating structure information and prior knowledge of the Kinect noise model. Through analyzing the solution to the optimization framework, we also derive a local filtering version that provides an efficient and effective way of improving the existing filtering techniques. Quantitative evaluations on our developed synthesized dataset and experiments on real Kinect data show that the proposed method achieves superior performance in terms of recovery accuracy and visual quality.", "keywords": [ "Algorithms", "Performance", "Depth recovery", "Kinect", "variational framework" ], "authors": [ { "name": "Chongyu Chen", "org": "Xidian University, Shaanxi, China" }, { "name": "Jianfei Cai", "org": "Nanyang Technological University, Nanyang Avenue, Singapore" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University, Nanyang Avenue, Singapore" }, { "name": "Tat-Jen Cham", "org": "Nanyang Technological University, Nanyang Avenue, Singapore" }, { "name": "Guangming Shi", "org": "Xidian University, Shaanxi, China" } ], "venue": "ACM Transactions on Intelligent Systems and Technology", "year": 2015 }, "773arM1b": { "id": "773arM1b", "title": "Mesh Snapping: Robust Interactive Mesh Cutting Using Fast Geodesic Curvature Flow", "abstract": "", "keywords": [ "languages" ], "authors": [ { "name": "Juyong Zhang", "org": "" }, { "name": "Chunlin Wu", "org": "" }, { "name": "Jianfei Cai", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Xue-Cheng Tai", "org": "" } ], "venue": "Comput. Graph. Forum", "year": 2010 }, "sevCn7fR": { "id": "sevCn7fR", "title": "MCAEM: mixed-correlation analysis-based episodic memory for companion-user interactions.", "abstract": "This paper considers episodic memory for companion–human interaction, aiming at improving user experience of interactions by endowing social companions with awareness of past experience. Due to noise and incomplete cues from natural language and speech in real-world interaction, accurate memory retrieval is very challenging and the noise resistance is important in practice. To improve the robustness of companion–human interaction, we propose a mixed-correlation analysis-based episodic memory (MCAEM) model, in which the correlations between memory elements are analyzed and then utilized for memory retrieval. In particular, the correlations are analyzed in three aspects: the relations between elements, importance of attributes and order of events. Based on the mixed-correlation analysis, a new similarity measure is constructed, which has substantially enhanced the noise resistance of memory retrieval. Experiments on a dataset collected from interaction in movies quantitatively evaluate the MCAEM model and compare it with prior work. Also, a user study is conducted to investigate the benefits of integrating the MCAEM model into social companions. The results demonstrate that the companions equipped with the MCAEM model not only have better retrieval performance, but also improve user experience in many aspects.", "keywords": [ "Companion–human interaction", " Episodic memory", " Computational model", " Noise-resistant retrieval", " Correlation analysis" ], "authors": [ { "name": "Juzheng Zhang", "org": "" }, { "name": "Jianmin Zheng", "org": "" }, { "name": "Nadia Magnenat-Thalmann", "org": "" } ], "venue": "The Visual Computer", "year": 2018 }, "zWU2XdU6": { "id": "zWU2XdU6", "title": "Nature grasping by a cable-driven under-actuated anthropomorphic robotic hand", "abstract": "Human hand is the best sample for humanoid robotic hand and a nature grasping is the final target that most robotic hands are pursuing. Many prior researches had been done in virtual and real for simulation the human grasping. Unfortunately, there is no perfect solution to duplicate the nature grasping of human. The main difficulty comes from three points. 1. How to 3D modelling and fabricate the real hand. 2. How actuated the robotic hand as real hand. 3. How to grasp objects in different shapes like human hand. To deal with these three problems and further to provide a partial solution for duplicate human grasping, this paper introduces our method to solve these problems from robotic hand design, fabrication, actuation and grasping plan. Our modelling progress takes only around 12 minutes that include 10 minutes of 3D scanning of a real human hand and two minutes for changing the scanned model to an articulated model by running our algorithm. Our grasping plan is based on the sampled trajectory and easy to implement for grasping different objects. Followed these steps, a seven DOF robotic hand is created and tested in the experiments.", "keywords": "", "authors": [ { "name": "Li Tian", "org": "Nanyang Technological University (NTU)" }, { "name": "Nadia Magnenat Thalman", "org": "Nanyang Technological University (NTU)" }, { "name": "Daniel Thalmann", "org": "École Polytechnique Fédérale de Lausanne" }, { "name": "Jianmin Zheng", "org": "Nanyang Technological University (NTU)" } ], "venue": "TELKOMNIKA : Indonesian Journal of Electrical Engineering", "year": 2019 }, "vsstJ5fi": { "id": "vsstJ5fi", "title": "Technical Section: A geometric approach to the modeling of the catheter-heart interaction for VR simulation of intra-cardiac intervention", "abstract": "Cardiac intervention is a minimally invasive diagnostic and therapeutic procedure used to treat cardiac diseases. The mapping of heart geometry with minimal visual assistance presents a technical challenge for interventional cardiologists attempting catheter navigation. This paper presents a geometric approach to modeling the catheter-heart interaction for VR simulations of catheter navigation within a heart chamber. Three types of modeling are used to model the interaction between the catheter and the heart wall: non-slip, pseudo-slip and slip modeling. A two-step shape memory process that minimizes the bending of and strain on the catheter is designed for catheter deformation for non-slip or pseudo-slip contact, and a progressive group linkage bending process that constrains the catheter curvature and position within the volume enclosure is designed for catheter deformation for slip contact. The proposed model is consistent with the observations made during the experiment. The model is able to deform the catheter in any free-state shape within the volume enclosure and is independent of local motion increment. Thus, it presents advantages in terms of complexity and real-time requirements.", "keywords": [ "intra-cardiac intervention", "catheter deformation", "geometric approach", "catheter-heart interaction", "heart geometry", "catheter navigation", "cardiac disease", "slip modeling", "VR simulation", "catheter curvature", "heart wall", "heart chamber", "volume enclosure", "Technical Section", "proposed model" ], "authors": [ { "name": "Patricia Chiang", "org": "School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Yiyu Cai", "org": "Institute for Media Innovation and School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Koon Hou Mak", "org": "Mak Heart Clinic and School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Ei Mon Soe", "org": "School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore" }, { "name": "Chee Kong Chui", "org": "Department of Mechanical Engineering, National University Singapore, Singapore 119077, Singapore" }, { "name": "Jianmin Zheng", "org": "School of Computer Engineering, Nanyang Technological University, Singapore 639798, Singapore" } ], "venue": "Computers and Graphics", "year": 2011 }, "2E2ST5MF": { "id": "2E2ST5MF", "title": "Gaussian and mean curvatures of rational Bézier patches", "abstract": "This note derives formulae for Gaussian and mean curvatures for rational Bézier surface patches. The formulae are expressed in terms of simple geometric quantities (lengths and areas) obtained from the control mesh. These formulae provide more geometric intuition and are easier to compute than the generic formulae from differential geometry. Both the tensor product and triangular patch cases are addressed.", "keywords": [ "geometric intuition", "mean curvature", "rational b", "generic formula", "zier surface patch", "simple geometric quantity", "tensor product", "triangular patch case", "rational b ezier patches", "gaussian curvature", "rational bézier patches", "zier patch", "control mesh", "differential geometry" ], "authors": [ { "name": "Jianmin Zheng", "org": "" }, { "name": "Thomas W. Sederberg", "org": "" } ], "venue": "Computer Aided Geometric Design", "year": 2003 }, "SYooCgpb": { "id": "SYooCgpb", "title": "An Interactive Computational Design Tool for Large Reciprocal Frame Structures", "abstract": "This paper presents the detail of our interactive tool for designing reciprocal frame (RF) structures. In general, our tool addresses the RF design problem with three major steps: (1) it supports the design of RF-tessellation by connecting RF patterns and plane tiling; (2) it delivers interactive preview and exploration of RF designs in 3D space through conformal mapping; and (3) it performs a novel optimization method to arrange the rods in the RF-structures, so that we can ensure rod collinear contacts in the structures. This paper supplements our previous work with implementation details, user interface design and operations, as well as a preliminary study and various new results we devised from the tool.", "keywords": [ "tessellations", "algorithms", "computer technology", "automation", "geometric analysis" ], "authors": [ { "name": "peng song", "org": "nanyang technological university" }, { "name": "chiwing fu", "org": "nanyang technological university" }, { "name": "prashant goswami", "org": "nanyang technological university" }, { "name": "jianmin zheng", "org": "nanyang technological university" }, { "name": "niloy j mitra", "org": "university college london" }, { "name": "daniel cohenor", "org": "tel aviv university" } ], "venue": "Nexus Network Journal", "year": 2014 }, "tYgFwETI": { "id": "tYgFwETI", "title": "Multiple consumer-grade depth camera registration using everyday objects.", "abstract": "Abstract The registration of multiple consumer-grade depth sensors is a challenging task due to noisy and systematic distortions in depth measurements. Most of the existing works heavily rely on large number of checkerboard observations for calibration and registration of multiple depth cameras, which is tedious and not flexible. In this paper, we propose a more practical method for conducting and maintaining registration of multi-depth sensors, via replacing checkerboards with everyday objects found in the scene, such as regular furniture. Particularly, high quality pre-scanned 3D shapes of standard furniture are used as calibration targets. We propose a unified framework that jointly computes the optimal extrinsic calibration and depth correction parameters. Experimental results show that our proposed method significantly outperforms state-of-the-art depth camera registration methods.", "keywords": "", "authors": [ { "name": "Teng Deng", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Jianfei Cai", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Tat-Jen Cham", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" }, { "name": "Jianmin Zheng", "org": "Institute for Media Innovation, Nanyang Technological University, Singapore" } ], "venue": "Image Vision Comput.", "year": 2017 }, "989J3CGW": { "id": "989J3CGW", "title": "Perturbing Bézier coefficients for best constrained degree reduction in the L2-norm", "abstract": "This paper first shows how the Bézier coefficients of a given degree n polynomial are perturbed so that it can be reduced to a degree m ( n) polynomial with the constraint that continuity of a prescribed order is preserved at the two endpoints. The perturbation vector, which consists of the perturbation coefficients, is determined by minimizing a weighted Euclidean norm. The optimal degree n - 1 approximation polynomial is explicitly given in Bézier form. Next the paper proves that the problem of finding a best L2-approximation over the interval [0, 1] for constrained degree reduction is equivalent to that of finding a minimum perturbation vector in a certain weighted Euclidean norm. The relevant weights are derived. This result is applied to computing the optimal constrained degree reduction of parametric Bézier curves in the L2-norm.", "keywords": [ "parametric B", "perturbation coefficient", "Perturbing B", "minimum perturbation vector", "degree reduction", "approximation polynomial", "zier coefficient", "degree m", "degree n polynomial", "perturbation vector", "optimal degree n" ], "authors": [ { "name": "Jianmin Zheng", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Guozhao Wang", "org": "Department of Mathematics/Institute of Image and Computer Graphics, Zhejiang University, Hangzhou 310027, PR China" } ], "venue": "Graphical Models", "year": 2003 }, "Lq55tjKM": { "id": "Lq55tjKM", "title": "Corrigendum to: linear perturbation methods for topologically consistent representations of free-form surface intersections", "abstract": "", "keywords": [ "linear perturbation method", "free-form surface intersection", "topologically consistent representation", "linear system", "solid modeling" ], "authors": [ { "name": "Xiaowen Song", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Thomas W. Sederberg", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Jianmin Zheng", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Rida T. Farouki", "org": "Department of Mechanical and Aeronautical Engineering" }, { "name": "Joel Hass", "org": "Department of Mathematics, University of California, Davis, CA" } ], "venue": "Computer Aided Geometric Design", "year": 2004 }, "BiMRDVvQ": { "id": "BiMRDVvQ", "title": "Non-uniform recursive subdivision surfaces", "abstract": " Doo-Sabin and Catmull-Clark subdivision surfaces arebased on the notion of repeated knot insertion of uniformtensor product B-spline surfaces. This paper developsrules for non-uniform Doo-Sabin and Catmull-Clarksurfaces that generalize non-uniform tensor product Bsplinesurfaces to arbitrary topologies. This added #exibilityallows, among other things, the natural introductionof features such as cusps, creases, and darts, whileelsewhere maintaining the same order of continuityastheir... ", "keywords": [ "catmull-clark surfaces", "doo-sabin surfaces", "b-splines", "tensor product", "b splines", "subdivision surface" ], "authors": [ { "name": "Thomas W. Sederberg", "org": "Brigham Young Univ., Provo, UT" }, { "name": "Jianmin Zheng", "org": "Brigham Young Univ., Provo, UT" }, { "name": "David Sewell", "org": "Sewell Development, Provo, UT" }, { "name": "Malcolm Sabin", "org": "Numerical Geometry Ltd., Cambridge, UK" } ], "venue": "SIGGRAPH", "year": 1998 }, "WFonbWQ2": { "id": "WFonbWQ2", "title": "Linear perturbation methods for topologically consistent representations of free-form surface intersections", "abstract": "By applying displacement maps to slightly perturb two free-form surfaces, one can ensure exact agreement between the images in R3 of parameter-domain approximations to their curve of intersection. Thus, at the expense of slightly altering the surfaces in the vicinity of their intersection, a perfect matching of the surface trimming curves is guaranteed. This exact agreement of contiguous trimmed surfaces is essential to achieving topologically consistent solid model constructions through Boolean operations, and has a profound impact on the efficiency and reliability of applications such as meshing, rendering, and computing volumetric properties. Moreover, the control point perturbations require only the solution of a linear system for their determination. The basic principles of this approach to topologically consistent surface trimming curves are described, and example results from the implementation of a simple instance of the method are presented.", "keywords": [ "topological consistency", "control point perturbation", "surface intersections", "free-form surface", "trimmed surfaces", "control point perturbations", "free-form surface intersection", "geometric continuity", "topologically consistent representation", "basic principle", "exact agreement", "geometric continuity.", "consistent surface", "linear system", "boolean operation", "displacement map", "linear perturbation method", "example result", "topologically consistent solid model" ], "authors": [ { "name": "Xiaowen Song", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Thomas W. Sederberg", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Jianmin Zheng", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Rida T. Farouki", "org": "Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA" }, { "name": "Joel Hass", "org": "Department of Mathematics, University of California, Davis, CA" } ], "venue": "Computer Aided Geometric Design", "year": 2004 }, "AvYrP9Qn": { "id": "AvYrP9Qn", "title": "Least squares methods for solving differential equations using Bézier control points", "abstract": "This paper investigates the use of the control points of the Bernstein-Bézier form for numerically solving differential equations. Two least squares type schemes based on degree raising and subdivision are proposed. The convergence of the methods applied to two-point boundary value problems is analyzed.", "keywords": [ "squares type scheme", "squares method", "differential equation", "zier form", "control point", "zier control point", "boundary value problem", "least squares method", "subdivision", "differential equations", "least square", "least square method" ], "authors": [ { "name": "Jianmin Zheng", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Thomas W. Sederberg", "org": "Department of Computer Science, Brigham Young University, Provo, UT" }, { "name": "Richard W. Johnson", "org": "Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID" } ], "venue": "Applied Numerical Mathematics", "year": 2004 }, "G9nQnrsl": { "id": "G9nQnrsl", "title": "Knot intervals and multi-degree splines", "abstract": "This paper studies the merits of using knot interval notation for B-spline curves, and presents formulae in terms of knot intervals for common B-spline operations such as knot insertion, differentiation, and degree elevation. Using knot interval notation, the paper introduces MD-splines, which are B-spline-like curves that are comprised of polynomial segments of various degrees (MD stands for \"multi-degree\"). MD-splines are a generalization of B-spline curves in that if all curve segments in an MD-spline have the same degree, it reduces to a B-spline curve. The paper focuses on MD-splines of degree 1, 2, and 3, as well as degree 1 and n. MD-splines have local support, obey the convex hull and variation diminishing properties, and are at least Cn-1, where n is the smaller of the degrees of two adjoining curve segments.", "keywords": [ "adjoining curve segment", "knot interval notation", "knot interval", "b-spline curve", "b-spline", "various degree", "common b-spline operation", "curve segment", "b-spline-like curve", "knot intervals", "multi-degree spline", "degree elevation", "knot insertion", "b spline", "convex hull", "differentiation" ], "authors": [ { "name": "Thomas W. Sederberg", "org": "Brigham Young University" }, { "name": "Jianmin Zheng", "org": "Zhejiang University, PR China" }, { "name": "Xiaowen Song", "org": "Zhejiang University, PR China" } ], "venue": "Computer Aided Geometric Design", "year": 2003 }, "UlnYvmm4": { "id": "UlnYvmm4", "title": "Perturbing Bézier coefficients for best constrained degree reduction in the L 2 -norm", "abstract": "", "keywords": [ "least square" ], "authors": [ { "name": "jianmin zheng", "org": "brigham young university" }, { "name": "guozhao wang", "org": "zhejiang university" } ], "venue": "Graphical Models \\/graphical Models and Image Processing \\/computer Vision, Graphics, and Image Processing", "year": 2003 }, "vISFM27n": { "id": "vISFM27n", "title": "Perturbing Béziercoefficients for best constrained degree reduction in the L2-norm", "abstract": "This paper first shows how the Bézier coefficients of a given degree n polynomial are perturbed so that it can be reduced to a degree m (Cold reinforcement techniques refer to reinforcement methods that produce no or only low tensile residual stresses in structural details, avoiding new fatigue vulnerable details. To ensure the fatigue safety and extend the fatigue life of steel bridges, cold reinforcement techniques are proposed to stop the fatigue cracking of the critical details of orthotropic steel decks (OSDs) and web gap zones. Cold reinforcement techniques were evaluated by fatigue testing in the laboratory, in situ steel bridge case studies, and numerical fracture mechanics analysis using the extended FEM. Compared with drilling stop-holes, cold bonding of steel plates or bonding and bolting of steel angles have shown to effectively decrease local stresses, increase local rigidity, and extend fatigue lives. For in situ case studies on both a railway and a highway bridge, measured fatigue stress range spectra indicated that the bonding and bolting steel plate methods significantly enhance local rigidity and decrease local stresses. Numerical fracture mechanics results reveal fatigue stresses at the crack tip below the threshold of crack propagation.
", "keywords": [ "Fatigue life", "Fatigue (material)", "Field tests", "Bridge tests", "Laboratory tests", "Steel bridges", "Case studies", "Steel plates" ], "authors": [ { "name": "Chun-sheng Wang", "org": "Professor, Engineering Research Center for Large Highway Structure Safety of Ministry of Education, School of Highway, Chang’an Univ., Xi’an 710064, China (corresponding author)." }, { "name": "Musai Zhai", "org": "Doctoral Student, School of Highway, Chang’an Univ., Xi’an 710064, China." }, { "name": "Lan Duan", "org": "Lecturer, School of Highway, Chang’an Univ., Xi’an 710064, China." }, { "name": "Yu-zhu Wang", "org": "Doctoral Student, School of Highway, Chang’an Univ., Xi’an 710064, China." } ], "venue": "Journal of Bridge Engineering", "year": 2018 }, "F3Mt2Uut": { "id": "F3Mt2Uut", "title": "Assessment of remaining fatigue life and service safety for old steel bridges based on fracture mechanics", "abstract": "A fracture mechanics method to evaluate the remaining fatigue life and service safety of old riveted steel bridges was proposed. According to the fatigue failure character of riveted members, a simplified fracture mechanics model (SFMM) was developed. Since SFMM could not incorporate the influence of the riveted details and pin load upon fatigue crack growth, an alternative riveted member fracture mechanics model (RMFMM) was proposed in this paper. Furthermore, a fracture finite element program was developed to calculate the geometry function of RMFMM. With the SFMM and RMFMM, the remaining fatigue life of all the vital members in Zhejiang Road Bridge was calculated through the simulation of crack growth. The calculation results show that the fatigue life of RMFMM is shorter 35% than SFMM, which indicates that the influence of the riveted details and pin load upon fatigue life is remarkable. In order to assure the normal service safety, the ultrasonic inspection intervals of SFMM and RMFMM are 4 years and 2 years respectively. The ultrasonic inspection interval is beyond 100 years for assuring the limit load capacity safety, which do not need to be considered in the bridge normal service life span.", "keywords": [ "Bridge engineering", "Fracture finite element model", "Fracture mechanics", "Inspection interval", "Old steel bridge", "Remaining fatigue life" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "CHEN Ai-rong", "org": "Tongji University(Tongji University,Tongji Univ.),Shanghai,China" }, { "name": "CHEN Wei-zhen", "org": "Tongji University(Tongji University,Tongji Univ.),Shanghai,China" } ], "venue": "Zhongguo Gonglu Xuebao/China Journal of Highway and Transport", "year": 2006 }, "WsfFojqj": { "id": "WsfFojqj", "title": "Experimental research on structure behaviors of steel and high performance concrete composite bridge tower", "abstract": "An axial compression test was practiced on a steel and high-performance-concrete composite bridge tower segment in order to study the structure behavior of the composite towers.From the test,the limit load-capacity and failure mode of the specimen were obtained,and the regularity of the strain and deformation were analyzed.The limit load-capacity was calculated according to the related codes of China and other countries,and two other calculate methods were proposed based on the test.The result shows that the local buckling of the panels has great influence on the limit load-capacity of the composite towers,when calculating the axial compression limit load-capacity,the local buckling of the panels must be determined firstly,and then adopting the formula for rectangle concrete filled steel tubular structures in design codes or the methods proposed in this paper.", "keywords": [ "local buckling", "composite bridge tower", "steel and high-performance-concrete", "bridge engineering" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "WANG Qian", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "WANG Xin-xin", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "XU Yue", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" } ], "venue": "Journal of Chang'an University(Natural Science Edition)", "year": 2011 }, "1YK3qUTC": { "id": "1YK3qUTC", "title": "Bending behavior and ductility test of high performance steel beam based on hybrid design", "abstract": "Based on the concept of hybrid design, 6 I-beams were designed and fabricated by high performance steel HPS 485W for flanges and steel Q235 for webs. In the bending test, these simple supported welding beams were loaded at mid-span. After the test, flexural capacity, deformation characteristics and the ultimate failure mode were analyzed during the whole experimental process. Test results show that web bucking strength and the rigidity of lateral bracing significantly affect the ultimate capacity, ductility and failure mode of tested beams. Flexural capacity is mainly contributed by flanges, and ductility is primarily affected by web. The descending stage of the bending capacity is controlled by the web bucking strength. It can be concluded that HPS beam with compact section has good plastic bending behavior and good ductility under effective lateral bracing system. Comparison between test result and theoretical calculation shows good coincidence between theoretical plastic moment and bending process in the test.", "keywords": [ "Bending behavior", "Bridge engineering", "Ductility", "High performance steel", "Hybrid design", "Rotation capacity" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Lan Duan", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "WANG Ji-ming", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Li Zheng", "org": "Chang'an University(Chang'an University),Xi An,China" } ], "venue": "Zhongguo Gonglu Xuebao/China Journal of Highway and Transport", "year": 2012 }, "0Z9tT6Jl": { "id": "0Z9tT6Jl", "title": "Mechanical Performance of Aluminum Alloy Bridges", "abstract": "The research findings of mechanical performance and the design and construction experiences of the aluminum alloy bridges in foreign countries are summarized and analyzed.In consideration of the influences of welding heat effect and low elastic modulus of the aluminum alloy,the proposal that the aluminum alloy bridge structures should be more rationally designed is made.On the basis of analysis of the stability performance of the aluminum alloy flexural elements,the effective measures for enhancing the aluminum alloy structure stability are put forward.With reference to the research findings on fatigue of the aluminum alloy bridges obtained by the Netherland scholars,the structural details and global fatigue performance of the aluminum alloy bridges are analyzed.The researches and construction practice of foreign countries demonstrate that the aluminum alloy can be safely and economically applied to bridge engineering.", "keywords": [ "mechanical performance", "aluminum alloy bridge", "stability", "fatigue" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridges and Tunnels of Shanxi Province,Chang′an University,Xi′an ,China" }, { "name": "GAO Shan", "org": "Key Laboratory for Bridges and Tunnels of Shanxi Province,Chang′an University,Xi′an ,China" } ], "venue": "World Bridges", "year": 2008 }, "KlF4rHu6": { "id": "KlF4rHu6", "title": "Calculation and Influential Parameter Analysis of Durability of Concrete Bridge Deck Slabs", "abstract": "In view of the problem that the structural performance degradation of concrete deck slabs under the action of durability factors has been seldom considered in the current design of concrete bridges and with reference to the concrete durability limit state theory,the calculation method for the durability of the deck slabs,considering the action of vehicle loading,was developed and the rational thickness of the slabs and the related factors(e.g.the deck slab thickness,concrete cover thickness,concrete strength and ordinary reinforcement diameters) having influences on the durability of the slabs were analyzed.The results of the analysis indicate that the thickness of the deck slabs of the highway concrete bridges that considers the durability requirements should be greater than 20 cm.In the general air environment,the concrete cover thickness of the slabs should be 3～5 cm while in the harsh air environment,the technical measures of appropriate increase of the thickness,utilization of the high performance concrete and adding of the crack resistant reinforcement meshes should be taken.To minimize the width of cracking in the deck slabs and to improve the durability,the reinforcement used for the slabs should be the ordinary reinforcement of small diameters.", "keywords": [ "rust corrosion cracking", "concrete deck slab", "durability", "concrete cover", "reinforcement corrosion" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridge and Tunnel of Shanxi Province,Chang'an University,Xi'an ,China" }, { "name": "ZHOU Jiang", "org": "CCCC First Highway Consultants Co.,Ltd.,Xi'an ,China" }, { "name": "MIAO Wen-hui", "org": "Key Laboratory for Bridge and Tunnel of Shanxi Province,Chang'an University,Xi'an ,China" } ], "venue": "Bridge Construction", "year": 2012 }, "hNnv9DO9": { "id": "hNnv9DO9", "title": "Experimental investigation and numerical analysis on local buckling behavior of steel bridge towers", "abstract": "According to the structure and mechanical behavior of steel bridge towers,a segment model with typical structure was designed and fabricated to investigate the stability behavior of steel bridge towers.An axial compression test was done on the specimen,the ultimate bearing load,local buckling mode,and mechanical behavior of the specimen were obtained,and the local buckling failure mechanism of steel bridge towers was summarized.Then,a finite element model of the specimen using shell element was established by the finite element software ANSYS,both the linear stability analysis and the nonlinear stability analysis were carried out.By comparison of the numerical results and the test results,it shows that: the nonlinear stability analysis including both material nonlinearities and geometric nonlinearities,as well as the initial local deformation is in good agreement with the test results;local buckling led to the change of the tower's geometry,while the increase of the local deformation,the distribution of axial strain of the tower's panels change from even to uneven.On the basis of the numerical results and the test results,some suggestions on the stability analysis and stability design were proposed.2 tabs,17 figs,8 refs.", "keywords": [ "Bridge engineering", "Finite element model", "Local buckling", "Model test", "Nonlinearity", "Stability analysis", "Steel bridge tower" ], "authors": [ { "name": "Qian Wang", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "WANG Chun-sheng", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Xin Yu", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Teng Xian Ren", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Yue Xu", "org": "Chang'an University(Chang'an University),Xi An,China" } ], "venue": "Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition)", "year": 2008 }, "6AEcTHdn": { "id": "6AEcTHdn", "title": "Fatigue Performance Evaluation and Cold Reinforcement for Old Steel Bridges", "abstract": "", "keywords": "", "authors": [ { "name": "Chunsheng Wang", "org": "Institute of Bridge Engineering, College of Highways, Chang’an University, Xi’an, People’s Republic of China" }, { "name": "Yuzhu Wang", "org": "Institute of Bridge Engineering, College of Highways, Chang’an University, Xi’an, People’s Republic of China" }, { "name": "Lan Duan", "org": "Institute of Bridge Engineering, College of Highways, Chang’an University, Xi’an, People’s Republic of China" }, { "name": "Shichao Wang", "org": "Institute of Bridge Engineering, College of Highways, Chang’an University, Xi’an, People’s Republic of China" }, { "name": "Musai Zhai", "org": "School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, People’s Republic of China" } ], "venue": "Structural Engineering International", "year": 2019 }, "IvNsbL4q": { "id": "IvNsbL4q", "title": "FATIGUE ASSESSMENT AND REPAIRING MEASURES OF THE RIB TO DECK CONNECTIONS IN ORTHOTROPIC STEEL BRIDGE DECKS", "abstract": "For its light weight,high ultimate bearing capacity and so on,orthotropic steel bridge deck has been widely applied in middle or long span bridges.Most of long span bridges that have been constructed or will be constructed also apply orthotropic steel bridge decks.Unfortunately,because of their complex configurations,the impact of weld residual stresses and the direct action of wheel load on the deck,the orthotropic steel bridge decks are prone to crack.Taking a suspension's orthotropic steel bridge deck for example,the fatigue life assessment was conducted on the rib to deck connections,based on the domestic and overseas research achievements,the repairing measures of the rib to deck connections are proposed,which could give references for the retrofit of the rib to deck connections.", "keywords": [ "rib to deck connections", "fatigue cracks", "orthotropic steel bridge decks", "crack repairing measures", "fatigue life assessment" ], "authors": [ { "name": "Feng Yacheng", "org": " China Railway First Survey and Design Institute Group Ltd,Xi'an ,China" }, { "name": "Wang Chunsheng", "org": "Chang'an University,Xi'an ,China" } ], "venue": "Steel Construction", "year": 2011 }, "uwF18MS3": { "id": "uwF18MS3", "title": "Health Condition Assessment of Concrete Cable-stayed Bridge Based on ANN", "abstract": "According to the characteristics of concrete cable-stayed bridge and the data of a conjoined twin cable-stayed bridges sharing a single tower,the 3-dementional finite-element model(3D FEM) of the bridge is set up using structure analysis software,and the modes are analyzed,so the numerical simulating mode and test data for the bridge health evaluation is available.With Graphical User Interfaces(GUI) of Matlab software,artificial neural network(ANN) parameters(such as ANN type,web topology structure,transfer function in every layer,stamp parameter,data pretreatment and quantity of training examples) are selected and the BPANN is built.According to the research on concrete cable-stayed bridge structure health condition assessment,the calculation process based on ANN is presented and is used in the conjoined twin cable-stayed bridges,and then the examples vectors are input and the constructed network is trained,so that a suitable assessment tool for concrete cable-stayed bridge is presented and the network is effective.The result shows that the exiting concrete cable-stayed bridge structure condition can be reflected effectually by this kind of assessment method.", "keywords": [ "finite element modeling", "health condition", "mode analysis", "classification and evaluation", "artificial neural network(ANN)", "concrete cable-stayed bridge" ], "authors": [ { "name": "SHANG Xin", "org": "Key Laboratory of Bridge Detection & Reinforcement Technology of Ministry of Communications, Chang'an University,Xi'an ,China;Xi'an Highway Research Institute,Xi'an ,China" }, { "name": "XU Yue", "org": "Key Laboratory of Bridge Detection & Reinforcement Technology of Ministry of Communications, Chang'an University,Xi'an ,China" }, { "name": "MA Bao-lin", "org": "Shanxi Provincal Highway Survey and Design Institute,Xi'an ,China" }, { "name": "WANG Chun-sheng", "org": "Key Laboratory of Bridge Detection & Reinforcement Technology of Ministry of Communications, Chang'an University,Xi'an ,China" } ], "venue": "Journal of Wuhan University of Technology", "year": 2011 }, "9awUZUvS": { "id": "9awUZUvS", "title": "Research on Structure Design of Steel Bridge Towers", "abstract": "The application of steel bridge towers in cable-supported bridges is in accordance with the new structure design concept of sustainable and green engineering.However,the construction of steel bridge towers in China is still limited,the clauses on steel towers are still blank in the present bridge design code.In this paper the structure design of steel towers is focused on,a model test on the tower's stability behaviors is carried out, some measures to prevent the buckling of the towers are proposed,and the appropriate setting of the cross-section is studied.Moreover,the application principle of the common connecting methods on the towers and the concrete foundation is explicitly analyzed,and the mechanic behaviors of different types of towers are also compared.All the researches can provide the references for the structure design of steel bridge towers in China.", "keywords": [ "connection of steel bridge towers and concrete foundation", "structure", "steel bridge towers", "tower style", "stability", "design" ], "authors": [ { "name": "WANG Qian", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shaanxi Province,Chang'an University,Xi'an ,China" }, { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shaanxi Province,Chang'an University,Xi'an ,China" }, { "name": "YU Xin", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shaanxi Province,Chang'an University,Xi'an ,China" }, { "name": "ZHANG Zi-hua", "org": "Highway Scientific Research Institute of Ministry of Communications,Beijing ,China" }, { "name": "REN Teng-xian", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shaanxi Province,Chang'an University,Xi'an ,China" }, { "name": "XU Yue", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shaanxi Province,Chang'an University,Xi'an ,China" } ], "venue": "Highway", "year": 2008 }, "1SPC0Sdv": { "id": "1SPC0Sdv", "title": "Mechanics behavior analysis on steel pylons of bridge structures", "abstract": "Analysis models for typical steel pylon styles of bridge structures are established using 3D beam elements,and the static and buckling behaviors of the pylon styles are analyzed.Then the static and buckling mechanics characters of typical pylon styles are gained,which shows that the pylon styles and constitutions have obvious effect on buckling behaviors of the steel pylons.The longitudinal and torsional buckling resistance of inverse V and A pylon style is superior than others.The position of crossbeam of H pylon style is higher,the longitudinal and torsional buckling resistance is larger.However,the position of crossbeam of A pylon style is higher,the longitudinal buckling resistance is lower.Therefore,the different pylon styles can be chosen according to the different design requirements.The ultimate load coefficient of steel pylon models with 3D beam elements is compared with the ones of models using 3D shell elements,which shows that the lost of local stability occur before the lost of total stability,the local buckling will control the design of steel pylons.The regularities of the stress distribution of beam and shell element models for steel pylons are similar,and the positions of the plastic area for different pylons are also similar,which shows the simulation is reasonable.3 tabs,15 figs,14 refs.", "keywords": [ "pylon style", "ultimate load coefficient", "buckling coefficient", "bridges engineering", "steel pylons", "static analysis", "finite element model" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "HUANG Ben-cai", "org": "Jilin Province Institute of Highway Survey and Design,Changchun ,Jilin,China" }, { "name": "YU Xin", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "ZHANG Zi-hua", "org": "Chinese Academy of Transportation Sciences,Ministry of Communications,Beijing ,China" }, { "name": "XU Yue", "org": "Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" } ], "venue": "Journal of Chang'an University(Natural Science Edition)", "year": 2007 }, "zpq4YQTL": { "id": "zpq4YQTL", "title": "Flexural Behavior Test of Rectangular Reinforced Concrete Beams of Steel Plate-concrete Composite Strengthening", "abstract": "In order to study the influence of different design parameters and reinforced configuration on flexural behavior of reinforced concrete,model test,numerical and theoretical analysis of four rectangular reinforced concrete beams of steel plate-concrete composite strengthening(SPCCS) were investigated.The applied load,deflection,strains,slip and crack initiation and propagation regularity were measured.The flexural behavior of SPCCS beam was simulated by the finite element software ANSYS.According to plastic failure characteristics of test beam under the ultimate bending capacity,simplified theoretical formulas were proposed.Test results show that using SPCCS,the ultimate load carrying capacity(ULCC) of test beam can be improved obviously.Influences of planting bar spacing on ULCC of SPCCS beam and the longitudinal relative slip between the original and new concrete interface are significant.Planting bar spacing increases with reduce of ULCC and load with the slip.The influences of shear span ratio on failure mode,ULCC,longitudinal relative slip of interface and the structural ductility of SPCCS beams are significant.The numerical and theoretical analysis results show that the numerical models can be well used to simulate mechanical behavior of test beam under bending failure but can not fully consider the interface slip between new and existing concrete,and brittle debonding failure at the end zone of strengthening.Theoretical value can agree well with test value in plastic flexural failure case,while difference of theoretical value and test value is big in brittle debonding failure case.", "keywords": [ "steel plate-concrete composite strengthening", "flexural behavior test", "planting bar spacing", "slip", "brittle debonding failure", "load carrying capacity", "bridge engineering" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "YUAN Zhuo-ya", "org": "Xi'an Highway Institute,Xi'an ,Shaanxi,China" }, { "name": "GAO Shan", "org": "Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "GUO Xiao-yu", "org": "Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" }, { "name": "FENG Lin-jun", "org": "Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an ,Shaanxi,China" } ], "venue": "China Journal of Highway and Transport", "year": 2011 }, "Z0oPN5Vq": { "id": "Z0oPN5Vq", "title": "Application of Bridge Construction Control Based on Gray System Theory Modified by Kalman Filtering Method", "abstract": "The gray system theory modified by Kalman filtering method is used in the inconsistent between the observed and theoretical values of the segment's deflection in bridge cantilever construction process. Firstly, get the statistically optimal estimatations of the observed value using Kalman filtering theory, then making it as the initial value, the gray system theory is used to predict the deflection of the next segment, and the formwork elevation of next stage is fixed. As a project example, a prestressed continuous girder bridge in Zhongshan City, Guangdong Province is put forward, respectively using the gray system theory and the gray system theory modified by Kalman filtering method to predict the deflection. According to the comparison from above two methods as well as the closure precision, the conclusion is the gray system theory modified by Kalman filtering can be more effective to reduce the deviation of observed and theoretical values, that means a better bridge linear control.", "keywords": [ "bridge engineering", "cantilever construction", "construction control", "pre-camber", "gray system theory modified by the Kalman filtering method" ], "authors": [ { "name": "zuo long luo", "org": "Changan Univ, Xian 710064, Shaanxi Provinc, Peoples R China" }, { "name": "yi fan song", "org": "Changan Univ, Xian 710064, Shaanxi Provinc, Peoples R China" }, { "name": "chun sheng wang", "org": "Changan Univ, Xian 710064, Shaanxi Provinc, Peoples R China" } ], "venue": "CONSTRUCTION AND URBAN PLANNING, PTS 1-4", "year": 2013 }, "qNEwaxit": { "id": "qNEwaxit", "title": "Fatigue crack growth rate tests of high performance steel HPS 485W for bridges", "abstract": "This paper is about the research of Chinese high performance steel HPS 485W for bridge engineering. Under fatigue load ratio of R=0.1, R=0.5 and R=0.8, fatigue crack growth rate (da/dN) tests were conducted for HPS 485W compact specimens with thickness of 7.5mm, 12.5mm and 19.5mm, respectively. The seven-point incremental polynomial method was adopted for local fitting to obtain fatigue crack growth rate. The tested HPS 485W has better crack growth resistance compared with traditional bridge steel 14MnNb. The test result shows specimen thickness is an influencing factor for crack growth rate, and fatigue crack growth rate increases with the increase of fatigue load ratio R. Furthermore, for 19.5mm HPS 485W specimen under fatigue load with R=0.1, the engineering threshold was tested and numerical calculation was conducted to obtain theoretical threshold. The calculated theoretical threshold is 7.22MPa·m1/2. The fatigue crack growth rate curves obtained can be used for fatigue design, fracture control, and life prediction for high performance steel bridge.", "keywords": [ "Fatigue and fracture", "Fatigue crack growth rate", "High performance steel", "Stress intensity factor", "Threshold value" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Lan Duan", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Li Zheng", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "HU Jing-yu", "org": "Chang'an University(Chang'an University),Xi An,China" } ], "venue": "Gongcheng Lixue/Engineering Mechanics", "year": 2013 }, "GaewvaI6": { "id": "GaewvaI6", "title": "Material properties and fatigue safety evaluation of old metal bridges", "abstract": "Lanzhou Zhongshan Bridge, which is located in the center of Lanzhou city, is a rivet truss bridge built in 1909. It is the first iron bridge over the Yellow River as well as a national cultural relic. An original steel angel cut off from Lanzhou Zhongshan Bridge was used to carry out a series of tests including material mechanics, fracture and fatigue property. Based on the test results, the fatigue and fracture safety was evaluated during the bridge remaining service life. What's more, remaining service life of Lanzhou Zhongshan Bridge was calculated and found that the trucks weight more than 120 kN should be limited to ensure the safety.", "keywords": [ "old metal bridge", "mechanical property", "toughness", "fatigue crack growth rate" ], "authors": [ { "name": "chun sheng wang", "org": "Changan Univ, Engn Res Ctr Large Highway Struct Safety, Minist Educ, Xian 710064, Shananxi Provin, Peoples R China" }, { "name": "hai jun sheng", "org": "CCCC Rd Bridge Special Engn Co Ltd, Wuhan, Hunan, Peoples R China" }, { "name": "jing yu hu", "org": "Changan Univ, Engn Res Ctr Large Highway Struct Safety, Minist Educ, Xian 710064, Shananxi Provin, Peoples R China" }, { "name": "sheng long yan", "org": "Changan Univ, Engn Res Ctr Large Highway Struct Safety, Minist Educ, Xian 710064, Shananxi Provin, Peoples R China" }, { "name": "lan duan", "org": "Changan Univ, Engn Res Ctr Large Highway Struct Safety, Minist Educ, Xian 710064, Shananxi Provin, Peoples R China" } ], "venue": "ADVANCES IN FRACTURE AND DAMAGE MECHANICS XI", "year": 2012 }, "7Of84ZWZ": { "id": "7Of84ZWZ", "title": "Real truck loading of a full-scale orthotropic steel deck model", "abstract": "A full scale model of orthotropic deck panel was designed and fabricated referring to the common steel box girder bridges used in China. Experiment was conducted to test the behavior and fatigue performance of the orthotropic steel bridge deck under the actual truck wheel load. The loading test was conducted on the platform specially prepared. Measurement of the over-all structure and the fatigue sensitive details was made to evaluate the performance of the panel. For each gauge position, the results are presented as the form of influence lines. © (2011) Trans Tech Publications, Switzerland.", "keywords": [ "influence lines", "orthotropic", "out-of-plane bending", "steel bridge deck", "trapezoidal ribs", "influence line" ], "authors": [ { "name": "Chunsheng Wang", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Tao Zhang", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Bingning Fu", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Liang Tang", "org": "Bridge Inspection Center(Bridge Inspection Center,Bridge Technology Center),Beijing,China" }, { "name": "Liji Huang", "org": "Bridge Inspection Center(Bridge Inspection Center,Bridge Technology Center),Beijing,China" } ], "venue": "Advanced Materials Research", "year": 2011 }, "8yyFzS10": { "id": "8yyFzS10", "title": "Fatigue crack growth rates of HPS 485W in China", "abstract": "This paper provides an introduction of existing fatigue and fracture behavior studies about high performance steel (HPS). This paper is emphasis on the crack propagation studies of HPS 485W, which is a new kind of structural weathered steel produced by Wuyang Steel Company using quenching and tempering (Q&T) in China. HPS has more advantages than traditional steel, such as high fracture toughness and cracking tolerance, high strength, low preheating weld or no preheating, recycle using and so on, so it can be used in sustainable bridge and building structures with low carbon releasing. To ensure the using safety and extend applying area of the new green civil material, the key material properties of HPS should be studied, such as fatigue crack growth rate. Fatigue crack growth rate characterizes the material resistance to stable crack extension under cyclic loading. A set of 5 compact specimens were made from 8mm and 14mm thick HPS 485W separately. Fatigue crack growth rate function of crack-tip stress-intensity factor range, da/dN versus Delta K, is proposed based on the test results, which shows HPS has high cracking tolerance ability.", "keywords": [ "high performance steel", "fracture toughness", "fatigue crack growth rate", "crack growth threshold" ], "authors": [ { "name": "Chunsheng Wang", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" }, { "name": "Lan Duan", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" }, { "name": "Jingyu Hu", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" } ], "venue": "ADVANCES IN FRACTURE AND DAMAGE MECHANICS IX", "year": 2011 }, "YJu1cU8D": { "id": "YJu1cU8D", "title": "Fatigue reliability updating evaluation of existing steel bridges", "abstract": "Through modern nondestructive inspection (NDI) techniques, fatigue cracks can be detected with varying accuracies in steel bridge structures, and consequently assessment and updating of fatigue reliability can be performed. A probabilistic fracture mechanics method based on the Bayes theorem using information from NDI has been demonstrated to update the relevant parameters of crack growth models effectively. Using the probabilistic characteristics of the NDI techniques, the probabilistic fatigue failure method, and the Bayes theorem, a procedure for assessing and updating the fatigue reliability of existing steel bridge components is presented. Data collected from two steel bridges, the Zhejiang Street Bridge and Ganjiang River Bridge, are used to illustrate the fatigue reliability assessment and updating method. In the case study, the suspender β-T curves of the Zhejiang Street Bridge and Ganjiang River Bridge are determined after inspection and updating. It is found in this research that the fatigue reliability of the selected members in the existing steel bridges increases with no cracks detected, decreases with no size cracks detected, and changes remarkably with cracks detected. © 2012 American Society of Civil Engineers.", "keywords": [ "bayes theorem", "fatigue reliability", "nondestructive inspections", "steel bridges", "updating evaluation", "cracking", "inspection", "probability", "china" ], "authors": [ { "name": "Chunsheng Wang", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Long Hao", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Bingning Fu", "org": "Chang'an University(Chang'an University),Xi An,China" } ], "venue": "Journal of Bridge Engineering", "year": 2012 }, "shxMyy4n": { "id": "shxMyy4n", "title": "FRACTURE AND TOUGHNESS TETS STUDY OF HIGH PERFORMANCE STEEL HPS 485W FOR BRIDGE ENGINEERING", "abstract": "To study the fracture behavior of high performance steel for bridge engineering,a series of fracture toughness tests were conducted for high performance steel HPS 485W,which was produced by Wuyang Steel Company in China.The toughness at different temperature was obtained from HPS 485W Charpy V notch toughness test,and the ductile to a brittle curve was fitted using a Boltzmann function.Charpy V notch toughness test shows that HPS 485W,compared with traditional steel,is characterized with higher toughness and lower brittle-ductile transition temperature.After the ductility fracture toughness(JIC) test,the calculated J values were obtained for 18mm and 28mm thick specimens,which shows good fracture toughness of HPS 485W.Crack tip opening displacement(CTOD) tests were conducted for 8mm and 14mm HPS485W specimens.CTOD test results show the good plasticity and toughness of HPS485W.Based on the stress and strain curve obtained from a tensile test for HPS485W,a failure assessment diagram was used for evaluation.The evaluation results show that the CTOD test result belonges to an acceptable field.Fracture toughness tests proposed in this paper are helpful in the safety assessment and fracture control of HPS bridges.", "keywords": [ "Bridge engineering", "Crack-tip opening displacement", "Ductile fracture toughness", "Fracture", "High performance steel", "Impact toughness" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridge and Tunnel Engineering of Chang’an University,Xi’an,Shaanxi ,China" }, { "name": "DUAN Lan", "org": "Key Laboratory for Bridge and Tunnel Engineering of Chang’an University,Xi’an,Shaanxi ,China" }, { "name": "HU Jing-yu", "org": "Key Laboratory for Bridge and Tunnel Engineering of Chang’an University,Xi’an,Shaanxi ,China" }, { "name": "ZHENG Li", "org": "Key Laboratory for Bridge and Tunnel Engineering of Chang’an University,Xi’an,Shaanxi ,China" } ], "venue": "Engineering Mechanics", "year": 2013 }, "Lg4ggtF2": { "id": "Lg4ggtF2", "title": "Fatigue Crack Growth Rate Tests of High Performance Steel HPS 485W", "abstract": "", "keywords": [], "authors": [ { "name": "lan duan", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "shichao wang", "org": "" } ], "venue": "", "year": 2013 }, "f2F2rLlR": { "id": "f2F2rLlR", "title": "Floor-beam web cutout shape analysis to improve the fatigue resistance in orthotropic steel bridge decks", "abstract": "The modern steel orthotropic decks have been used in steel bridges for 60 years all over the world because of its super structural advantages. Recently, more bridge owners, engineers and researchers pay more attention to the fatigue problem of orthotropic steel decks for a large number of fatigue cracks found in steel bridges. For example, bridge engineers have detected hundreds of fatigue cracks in steel orthotropic deck on the 888-meter long box girder of Humen Bridge only ten years after opening to traffic. How to design or repair the fatigue details in orthotropic steel decks is the critical question to be solved at first step. In current paper, the elaborate numerical analysis model of the orthotropic steel bridge decks was developed using ANSYS software with different floor-beam web cutouts shapes, such as conventional ellipse, circular, trapezoid and Haibach web cutouts. The finite element models were calibrated by static test of one full size orthotropic steel bridge deck model. According to the analysis results, it should select the rational cutout shapes based on actual load and structural conditions in steel bridge deck design and strengthening.", "keywords": [ "orthotropic steel bridge decks", "fatigue", "web cutouts", "static test", "numerical analysis" ], "authors": [ { "name": "Chunsheng Wang", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" }, { "name": "Qin Zhang", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" }, { "name": "Tao Zhang", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" }, { "name": "Yacheng Feng", "org": "Changan Univ, Coll Highways, Dept Bridge Engn, Xian 710064, Shaanxi Prov, Peoples R China" } ], "venue": "ADVANCES IN FRACTURE AND DAMAGE MECHANICS IX", "year": 2011 }, "7RiRQ7fY": { "id": "7RiRQ7fY", "title": "Floor-beam web cutout shape analysis in orthotropic steel bridge deck", "abstract": "In order to improve the fatigue orthotropic properties of steel bridge deck,the cutout shape was optimized by numerical simulation.The calculation models of four common cutouts were established,and the finite element model was calibrated by comparing the calculated results with the measured values derived from a full scale orthotropic steel deck test specimen with U shape cutouts.The effects of the cutout shapes and geometry size on the stress distribution at the crossbeam web cutouts were discussed.The numerical results show that the stress distribution of the Haibach and circular shape cutouts is rational,and the free edge radius of the additional cutouts is a key factor to affect the stress distribution at the crossbeam web cutouts.The effective measures were proposed to reduce the stresses at the floor web cutouts based on the calculated results,which give a useful technical reference to the fatigue design of steel bridge deck.1 tab,13 figs,10 refs.", "keywords": [ "Bridge engineering", "Cutout of crossbeam", "Fatigue", "Orthotropic steel bridge deck", "Parameter analysis", "Stress distribution" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "FU Bing-ning", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "Qin Zhang", "org": "Chang'an University(Chang'an University),Xi An,China" }, { "name": "FENG Ya-cheng", "org": "Chang'an University(Chang'an University),Xi An,China" } ], "venue": "Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition)", "year": 2012 }, "3ljsyGoF": { "id": "3ljsyGoF", "title": "A Brief Introduction of the Research and Application of HPS in North America", "abstract": "The Unite States has carried out several research programs to develop the high performance steel(HPS),which has higher strength,improved weldability,higher toughness,good weathering characteristic and fabrication.At present,HPS50W,HPS70W and HPS100W with the superior properties have been exploited.At the same time,the effective application of HPS in bridge design and construction has already been demonstrated the successful performance in over 40 states.On this basis,significant progress has been made in the AASHTO design codes to allow engineers to use more HPS in bridges.Research in Canada on HPS has focused primarily on fatigue aspects.The University of Albert initiated the research program,and further research was conducted about the fatigue details.Moreover,the first HPS bridge in Canada to employ HPS485W will be constructed to gain experience.", "keywords": [ "high performance steel", "HPS bridges", "mechanics performance", "toughness", "fatigue" ], "authors": [ { "name": "DUAN Lan", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shanxi,Chang'an University,Xi'an ,China" }, { "name": "WANG Chun-sheng", "org": "Key Laboratory for Bridge and Tunnel Engineering of Shanxi,Chang'an University,Xi'an ,China" } ], "venue": "Progress in Steel Building Structures", "year": 2008 }, "jIqM40iq": { "id": "jIqM40iq", "title": "ALUMINUM BRIDGE——THE RADIANT NOVA OF BRIDGE ENGINEERING", "abstract": "Because of the attributes of light-weight,well-durability,easy-maintaining and easy processing, aluminum alloy as a high-performance material is applied in civil engineering more and more widely.Especially the application in bridge engineering has drawn increasing interest and attention. Not only has the aluminum been applied in civil bridges,but also has been showed notable superiority in military as well.Having analyzed and summarized the designs and results of the research on mechanical performance of aluminum bridges,it is introduced the property and structural performance of the aluminum alloy and the application in civil bridges.According to many designs and construction experiences in overseas military aluminum bridges,it is also introduced the prospective of using aluminum alloy in the military bridge in detail.", "keywords": [ "stabilization", "aluminum bridge", "military aluminum bridge", "bridge deck", "civil aluminum bridge", "fatigue" ], "authors": [ { "name": "Wang Chunsheng", "org": "War Preparedness Office of Fujian Nanping Nanping " }, { "name": "Gao Shan", "org": "War Preparedness Office of Fujian Nanping Nanping " }, { "name": "Ye Lifeng", "org": "War Preparedness Office of Fujian Nanping Nanping " } ], "venue": "Steel Construction", "year": 2007 }, "uqSu7DKd": { "id": "uqSu7DKd", "title": "Forecast of heavy oil production well bottom flash by steam flooding in Jin 45 block", "abstract": "In the production process of heavy oil production well by steam flooding in Jin 45 block,the temperature of local layer by the effect is too high for the heterogeneity of strata,which leads to bottom flash.The model of well bottom temperature and pressure and flash prediction model are established according to the basic theory of heat transfer and computational fluid dynamics.The bottom temperature and pressure can be monitored by wellhead production parameters and structure parameters,and flash forecast can be achieved.With Jin-45-22-K281 well as an example,field testing and bottom flash forecast are carried out.The results of prediction and measurement show that the calculation error is within 5%,the prediction method of flash is effective,which can predict the bottom flash of heavy oil production wells by steam flooding,and provide the basis for the flash control of heavy oil production wells.", "keywords": [ "flash", "forecast", "heavy oil", "steam flooding" ], "authors": [ { "name": "LIU Gui-man", "org": "Jinzhou Oil Recovery Plant of Liaohe Oilfield,Linghai,Liaoning ,China" }, { "name": "MA Chun-bao", "org": "Jinzhou Oil Recovery Plant of Liaohe Oilfield,Linghai,Liaoning ,China" }, { "name": "ZHANG Shi-min", "org": "Jinzhou Oil Recovery Plant of Liaohe Oilfield,Linghai,Liaoning ,China" }, { "name": "GUI Lie-ting", "org": "Jinzhou Oil Recovery Plant of Liaohe Oilfield,Linghai,Liaoning ,China" }, { "name": "WANG Chun-sheng", "org": "Petroleum Engineering College,Northeast Petroleum University,Daqing,Heilongjiang ,China" } ], "venue": "Journal of Daqing Petroleum Institute", "year": 2010 }, "z7RHQNyp": { "id": "z7RHQNyp", "title": "A New Prediction Method for Flashing Parameters in Heavy Oil Production by Steam Flooding", "abstract": "Flashing is a new problem in heavy oil production technology with steam flooding. It can cause pump air locks, pump and pump tubing damage, reduced production, and other problems. A difficulty in predicting flashing parameters involves accurate calculation of the bottomhole temperature and pressure. Based on the principles of heat transfer and fluid dynamics, we have proposed the following models: a model for the wellbore temperature distribution, a model for the stress distribution, a model for calculating the partial loss of pressure when the fluid flows through a fixed valve, and also a model for calculating the parameters for steam flooding of heavy oil, taking into account corrections for the influence of the parameters of the oil — water mixture on the steam critical temperature vs. pressure curve. Taking into account the nature of the fluid, the moisture content, the temperature and other wellbore parameters, the model permits real-time monitoring of flashing in the pump. Experiments were conducted on Jin 45-22-K281 wells. We performed a comparative analysis of the calculated and experimentally measured values. We have shown that the model for calculating flashing parameters is sufficiently accurate for the bottomhole fluid conditions. Analysis of the factors influencing the flashing effect may be useful for providing a theoretical basis for steam flooding parameters.", "keywords": [ "prevention of flashing", " heavy oil", " steam flooding", " wellbore temperature", " wellbore pressure" ], "authors": [ { "name": "Yan Zhou", "org": "School of Petroleum Engineering, Northeast Petroleum University, Daqing, China" }, { "name": "Chunsheng Wang", "org": "School of Petroleum Engineering, Northeast Petroleum University, Daqing, China" }, { "name": "Qiji Sun", "org": "School of Petroleum Engineering, Northeast Petroleum University, Daqing, China" } ], "venue": "Chemistry and Technology of Fuels and Oils", "year": 2019 }, "PxEXEhKd": { "id": "PxEXEhKd", "title": "The Research and Application of High Temperature Resistance Plugging Agent and Plugging Technology", "abstract": "", "keywords": [], "authors": [ { "name": "wang chunsheng", "org": "northeast petroleum university" }, { "name": "sun yingfan", "org": "northeast petroleum university" }, { "name": "zhang zhenzhen", "org": "northeast petroleum university" }, { "name": "meng shan", "org": "northeast petroleum university" }, { "name": "xu chang", "org": "northeast petroleum university" } ], "venue": "", "year": 2014 }, "IS6icDNS": { "id": "IS6icDNS", "title": "Hydraulic design for liquid-gas separator with multi-cups and isoflowrate", "abstract": "In order to increase the pump efficiency of pumping wells,after analyzing the influence factors on liquid-gas separation efficiency,principles of decreasing liquid sedimentation velocity and increasing of liquid-gas separation efficiency in the liquid-gas separator with Multi-cup and isoflowrate,the flow equations and the design methods are given.According to statistical data,the average pump efficiency was increased by more than 25%.", "keywords": [ "hydraulic design", "pumping well", "liquid-gas separator", "pump efficiency" ], "authors": [ { "name": "YANG Shu-ren", "org": "Key Laboratory of Enhanced Oil Recovery,Daqing Petroleum Institute,, China" }, { "name": "WANG Yan", "org": "Key Laboratory of Enhanced Oil Recovery,Daqing Petroleum Institute,, China" }, { "name": "WANG Chun-sheng", "org": "Key Laboratory of Enhanced Oil Recovery,Daqing Petroleum Institute,, China" }, { "name": "ZHANG Shu-min", "org": "Oil Recovery Plant No.1,Daqing Oilfield Corp.Ltd.,Daqing,Heilongjiang ,China" } ], "venue": "Journal of Daqing Petroleum Institute", "year": 2006 }, "nsWqDjdX": { "id": "nsWqDjdX", "title": "The Mechanism Study of Vortex Tools Drainage Gas Recovery of Gas Well", "abstract": "", "keywords": [ "numerical simulation" ], "authors": [ { "name": "wang chunsheng", "org": "northeast petroleum university" }, { "name": "wang xiaohu", "org": "northeast petroleum university" }, { "name": "d u qiuying", "org": "northeast petroleum university" }, { "name": "feng bingkai", "org": "northeast petroleum university" }, { "name": "xu chang", "org": "northeast petroleum university" } ], "venue": "", "year": 2014 }, "Tf5RUclP": { "id": "Tf5RUclP", "title": "Study on the Pilot Test of Steam Flooding in Type Ⅱ Heavy Oil Reservoir", "abstract": "9 well groups of Jin 45 is optimized in Liaohe Oilfield whose structural development are much completed as type Ⅱ heavy oil reservoir and do pilot test of steam flooding experiment.During the test,steam quality is guarantee ingected stricty and strengthen enhancing effective injection to production ratio.After production by steam flooding over 1 year,most oil wells were obviously affected.Steam chamber is getting to extend,and the test enter the effective displacing stage;the daily liquid rate and oil rate obviously increase in the test region,at the same time,formation pressure keep stable,oil layer temperature generally increase,production to injection ratio and oil to steam ratio continues increase.The test preliminary prove that it is feasible in technique and economic to implement steam flooding in the type Ⅱ heavy oil reservoir as Jin 45 Block.This will provide important instruction and references for the steam flooding in such type Ⅱ heavy oil reservoir with 1.8 × 108 t in Liaohe oil province.", "keywords": [ "steam flooding type Ⅱ heavy oil reservoir Jin45 Block pilot test Liaohe Oilfield" ], "authors": [ { "name": "WANG Chun-sheng", "org": "MOE Key Laboratory of Enhancing Oil and Gas Recovery,Daqing Petroleum Institute,Daqing ,P.R.China" }, { "name": "CUI Hai-qing", "org": "MOE Key Laboratory of Enhancing Oil and Gas Recovery,Daqing Petroleum Institute,Daqing ,P.R.China" }, { "name": "YANG Shu-ren", "org": "MOE Key Laboratory of Enhancing Oil and Gas Recovery,Daqing Petroleum Institute,Daqing ,P.R.China" } ], "venue": "Science Technology and Engineering", "year": 2010 }, "YKUAWBHe": { "id": "YKUAWBHe", "title": "Development and Performance Evaluation of a High-Temperature Profile Control System.", "abstract": "In the late stage of the steam flooding development of heavy oil reservoirs, the contradiction between layers is prominent, which makes the development of the reservoir difficult. To obtain a profile control agent suitable for steam flooding in heavy oil reservoirs, the modification technology was used to improve the temperature resistance of the traditional NH-1 main agent, as the conjugation effect may enhance the stability of the molecular structure. Thus, we obtained the modified NH-1 main agent, which was used in combination with graphite particles. To explore the oil displacement effect of the profile control system, the single-variable method was used to optimize the profile control system and evaluate its performance. Moreover, the multimedium steam flooding experiment was carried out to further verify the profile control capability of the profile control system. The results show that the formula of the graphite particle-gel compounding system is 0.03% coagulant BK-A05 + 2.2% cross-linking agent I + 1.8% cross-linking agent II + 6% modified NH-1 main agent (prepared by reacting NH-1 main agent with 65% concentrated nitric acid at a solid-liquid ratio of 1:6) + 0.7% graphite particles (10 000 meshes) + 0.3% suspending agent CMC. The gel viscosity of the profile control system can reach 2 × 10 mPa·s, the gel temperature range is wide (160-280 °C), and the temperature resistance is 300 °C. The profile control system has good injection performance, plugging effect, washing resistance, and thermal stability and is significantly better than the gel system alone. The experiment results also show that the profile control system has a strong profile control capability and expands the swept volume. The crude oil recovery increases by 8.89%, and it can be effectively applied to the profile control operation of heavy oil multimedium steam flooding.", "keywords": "", "authors": [ { "name": "Chunsheng Wang", "org": "School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China." }, { "name": "Lei Zhang", "org": "School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China." }, { "name": "Guoshuai Ju", "org": "School of Continuing Education, Northeast Petroleum University, Daqing 163318, China." }, { "name": "Qiji Sun", "org": "School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China." } ], "venue": "ACS omega", "year": 2020 }, "fYHOtm2e": { "id": "fYHOtm2e", "title": "Solving Problems of Freezing and Blocking of Tail Gas Pipelines While Developing Oil Fields by Fire Flooding", "abstract": "In the process of oil field development by fire flooding, some sections of the tail gas gathering pipelines may get frozen and blocked due to high content in the gas of moisture, methane, ethane, carbon dioxide, and hydrogen sulfide. To solve this problem, investigations were conducted to determine the effect of tail gas components, flow rate, pipeline length, and surrounding temperature on the process of reduction of transmission capacity of the gas pipelines due to freezing and blocking. It was found that the methane content in the gas is mainly responsible for gas hydrate formation and wall freezing, which occur predominantly in the back parts of straight pipes and pipe elbows and junctions. According to calculations, 70% methanol concentration is the best hydrate inhibitor.", "keywords": [ "fire flooding", "tail gas", "pipeline blocking", "wall freezing", "hydrate formation", "SECT (heating by electric current skin effect)" ], "authors": [ { "name": "Wang Chunsheng", "org": "Northeast Petroleum University,Daqing,China" }, { "name": "Xu Yujian", "org": "Northeast Petroleum University,Daqing,China" } ], "venue": "Chemistry and Technology of Fuels and Oils", "year": 2016 }, "mIrTBUQU": { "id": "mIrTBUQU", "title": "Development and Performance Evaluation of Steam Channeling PluggingAgent of Thermal Oil Recovery", "abstract": "", "keywords": [ "compound" ], "authors": [ { "name": "wang chunsheng", "org": "" }, { "name": "sun yingfan", "org": "" }, { "name": "he chenglin", "org": "" }, { "name": "zhang haipeng", "org": "" }, { "name": "d u qiuying", "org": "" } ], "venue": "The Open Petroleum Engineering Journal", "year": 2015 }, "qKXOy1cD": { "id": "qKXOy1cD", "title": "The Development of the New High Temperature Resistance Profile Control Agent Which is Compound With Inorganic Particles and Ge", "abstract": "", "keywords": [ "compound" ], "authors": [ { "name": "wang chunsheng", "org": "northeast petroleum university" }, { "name": "sun yingfan", "org": "northeast petroleum university" }, { "name": "dong guoqing", "org": "northeast petroleum university" }, { "name": "y u haoyang", "org": "northeast petroleum university" }, { "name": "x u yujian", "org": "northeast petroleum university" } ], "venue": "", "year": 2014 }, "FG3ty2Cy": { "id": "FG3ty2Cy", "title": "Laboratory Study of Different Injection Flooding in the Test Area of High Concentration", "abstract": "In order to enhance oil recovery,the method of tapping the potential for residual oil is researched for,and to further improve the theoretical system of polymer flooding.The adaptability of different injection ways to the test area of high concentration is studied through the indoor physical simulation experiment,and then the optimized combination of slug is selected in order to provide reference for the program design for the experimental area.Mainly carried out:(1) The study of flooding effects of the same polymer,different concentrations,and single-section of Sierra Leone : 25 million refinery ultra-high points and 7 million salt-resistant polymer have been adopted,in which ultra-high sub-25 million refinery injected polymer concentration 1 000 mg / L,1 500 mg / L,2 000 mg / L,2 500 mg / L,3 000 mg / L concentration of 5 points,another 7 million into the salt-resistant polymer concentration of 800 mg / L,1 100 mg / L,1 400 mg / L,1 700 mg / L,2 000 mg / L concentration of point 5,polymer flooding after water flooding experimental research has been carried out,the recovery of different stages,moisture content variation,determining the timing adjustment of polymer injection are got,concentration of the best injection,polymer dosage,and the final effect of enhanced oil recovery of two kinds of polymer flooding alone are optimized;(2)The study of flooding effects of the same polymer,different concentrations,Multi-slug combination :by using sub-25 million ultra-high polymer,concentrations of injection are 2500 mg/L,2000 mg/L,1200 mg/L,the total volume of polymer is 2000mg/L.PV,through the changes in the size of slug,combined into four sets of programs,the final follow-up to 98% of water flooding into the water,arrived at a different degree of control program flow of oil displacement effect,25 million different concentrations of polymer slug echelon combinations and the effect of enhanced oil recovery are evaluated to determine.(3)The study of flooding effects of different polymer,different concentrations,multi-slug combination: according to the first results of the experiment refining high points,and another 25 million the appropriate concentration of salt-resistant polymer 7 million have been identified,the total polymer dosage is 2 000 mg/L·PV,the changes of injection pressure,integrated moisture content,suction fluid index and recovery of three sets of programs are measured,flooding effects of different polymers,different concentrations,multi-slug combination being evaluated,different concentrations of more than two kinds of polymer slug combination of oil displacement effect being evaluated to determine.Last,through a comprehensive comparison of recovery Level,pressure and polymer dosage of three kinds of programs,best injection programs of test area of high concentration have been identified.", "keywords": [ "high concentration refining high points salt-resistant polymer slug combinationpv number lab experiment" ], "authors": [ { "name": "WANG Chun-sheng", "org": "" }, { "name": "CUI Hai-qing", "org": "" }, { "name": "XU Bing-tao", "org": "" }, { "name": "JIANG Yu-zhuo", "org": "" } ], "venue": "Science Technology and Engineering", "year": 2010 }, "pjFhE4vP": { "id": "pjFhE4vP", "title": "The Analysis of Hydrates Frozen Blocking in Fire Flooding Exhaust Gas of Heavy Oil", "abstract": "", "keywords": [ "mathematical model" ], "authors": [ { "name": "wang chunsheng", "org": "northeast petroleum university" }, { "name": "zheng jie", "org": "northeast petroleum university" }, { "name": "sun yingfan", "org": "northeast petroleum university" }, { "name": "chu huijuan", "org": "northeast petroleum university" }, { "name": "tian minglei", "org": "northeast petroleum university" }, { "name": "xu chang", "org": "northeast petroleum university" } ], "venue": "", "year": 2015 }, "0EQ7wF3p": { "id": "0EQ7wF3p", "title": "Advances of Research on Postharvest Physiology and Storage Technology of Pomegranate Fruit", "abstract": "The progress in postharvest physiology of pomegranate fruit, including quality changes, respiration, ethylene production, chilling injury and husk scald, postharvest pathology and preservation technology are summarized. Such preservation technologies including cold storage, CA storage, and mininal processing are introduced.", "keywords": [ "postharvest physiology", "pomegranate", "preservation", "storage" ], "authors": [ { "name": "ZHAO Ying-li", "org": "Insitute of Agricultual Product Storage and Freshening, Shanxi Academy of Agricultual Sciences, Taiyuan , China" }, { "name": "LI Jian-hua", "org": "Insitute of Agricultual Product Storage and Freshening, Shanxi Academy of Agricultual Sciences, Taiyuan , China" }, { "name": "WANG Chun-sheng", "org": "Insitute of Agricultual Product Storage and Freshening, Shanxi Academy of Agricultual Sciences, Taiyuan , China" } ], "venue": "Storage & Process", "year": 2008 }, "8XLLCKv5": { "id": "8XLLCKv5", "title": "Research Progress on Alleviation of Cold-sensitivity of Stored Peach Fruit", "abstract": "This paper reviewed recent research situation at home and abroad on the regulation effects of temperature, gas, chemical agent, plant growth regulator on the cold sensitivity of peach fruit.", "keywords": [ "peach", "cold sensitivity" ], "authors": [ { "name": "FENG Zhi-hong", "org": "Institute of Farm Product Storage and Fresh-keeping, Shanxi Academy of Agricultural Science, Taiyuan , China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping, Shanxi Academy of Agricultural Science, Taiyuan , China" } ], "venue": "Food Science", "year": 2009 }, "UehMHvyL": { "id": "UehMHvyL", "title": "Effects of SO_2 dual release on the storage quality of Red Globe grape", "abstract": "The effects of SO2 on Red Globe grape physiology and SO2 injure during storage were studied.Fruits of Red Globe grape were treated with SO2 dual release,then stored at(0±0.5) ℃ for 180 d.The results showed that SO2 dual release treatment delayed the decreasing of titratable acid and Vc,and kept nutritional components of grape.We found that SO2 dual release treatment evidently delayed the increase of membrane permeability and MDA content,and kept integrity of membrane.It was also found that SO2 dual release treatment decreased SO2 injure and residues,and guaranteed edible safety and commodity value of the grape.", "keywords": [ "SO2 injure", "Red Globe grape", "Dual release" ], "authors": [ { "name": "ZHAO Meng", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan,Shanxi China" }, { "name": "WANG Chun-sheng", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan,Shanxi China" }, { "name": "LI Jian-hua", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan,Shanxi China" }, { "name": "ZHANG Li-xin", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan,Shanxi China" } ], "venue": "Journal of Fruit Science", "year": 2011 }, "fuJ9NPau": { "id": "fuJ9NPau", "title": "Effects of Different Temperatures and Film Packaging on Storability of Prunus Americana", "abstract": "The effects of temperature,film packaging and ethylene absorbents on firm,soluted solid sugars,color change,flavor of prunus americana were studied in this paper. The results showed that the lower the storage temperature, the more conducive to maintaining freshness and flavor in a certain temperature range and polyethylene (PE) film packaging was helpful to keep crisp and green of prunus americana. Packaged by 0.03 mm thick PE film packaging,the prunus americana was still good,crisp and green,fresh and great flavor at 0～1 ℃ for 70 d.", "keywords": [ "prunus americana", "film packaging", "storage", "temperature" ], "authors": [ { "name": "FENG Zhi-hong", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "ZHANG Li-xin", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "LIU Lian-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2010 }, "4GWDxGqF": { "id": "4GWDxGqF", "title": "Transportation and Preservation Technology of ‘Okubo’ Peach at Room Temperature", "abstract": "In this paper,the appropriate maturity of the fruit harvest is selected,the loading pallet means and fruit packing ways are improved,the changes of fruit temperature and fruit quality are studied during transportation at room temperature.", "keywords": [ "'Okubo'peach", "preservation technology", "room temperature", "transportation" ], "authors": [ { "name": "Feng Zhihong", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan,Shanxi ,China" }, { "name": "Zhao Yingli", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan,Shanxi ,China" }, { "name": "Li Jianhua", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan,Shanxi ,China" }, { "name": "Yan Genzhu", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan,Shanxi ,China" }, { "name": "Wang Liang", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan,Shanxi ,China" }, { "name": "Wang Chunsheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan,Shanxi ,China" } ], "venue": "Academic Periodical of Farm Products Processing", "year": 2010 }, "nlx9C950": { "id": "nlx9C950", "title": "Research Progress of Preservation Control Techniques of Cherry", "abstract": "From the temperature control,gas control and pressure control of storage environment,chemical preservation agent and biological preservation agent,etc,this paper summarized the research progress of preservation control techniques of cherry at home and abroad in recent years,propected the direction for future studies and applications of storage techniques of cherry,provided reference for the further study.", "keywords": [ "cherry", "control techniques", "preservation" ], "authors": [ { "name": "FENG Zhi-hong", "org": "The Institute of Agricultural Product Storage and Fresh-keeping,Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "The Institute of Agricultural Product Storage and Fresh-keeping,Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "CHEN Jia", "org": "The Institute of Agricultural Product Storage and Fresh-keeping,Shanxi Academy of Agricultural Sciences, Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2012 }, "I6Xplicu": { "id": "I6Xplicu", "title": "Effect of Different Dose Slow Release Agent of Na_2S_2O_5 on Lon gan Fruit Under Condition of Cold Storage", "abstract": "", "keywords": "", "authors": [ { "name": "Wang Chun-sheng", "org": "Institute of Farm Products Storage in Shanxi Academy of Agricultural Scien ces,Taiyuan030031,China)" } ], "venue": "Storage and Process", "year": 2003 }, "DQ6G6BlP": { "id": "DQ6G6BlP", "title": "Effects of Temperature and Packaging Method on Storability of ‘Red Fuji' Apple", "abstract": "With ‘Red Fuji' apple as material, the effects of temperature, packaging method and sulfite preservatives on quality are studied in this paper. The results show that the optimal treatments is at the ice temperature sealing in microporous package with ethylene absorber or in keeping-fresh bag with chemical absorber. The method can efficiently inhibited changes of the fresh firmness and the quality ingredients, and the fruits still maintain good quality after storage for 8 months.", "keywords": [ "'Red Fuji' apple", "storage quality", "packaging method", "temperature" ], "authors": [ { "name": "Zhao Meng", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" }, { "name": "Feng Zhihong", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" }, { "name": "Wang Chunsheng", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" }, { "name": "Li Jianhua", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" }, { "name": "Zhang Lixin", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" }, { "name": "Chen Jia", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" }, { "name": "Chen Huiyan", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan, Shanxi , China" } ], "venue": "Academic Periodical of Farm Products Processing", "year": 2011 }, "IgDsQxgb": { "id": "IgDsQxgb", "title": "Effects of 1-MCP on Ripening and Softening of 'Mopanshi' Persimmon After Harvest", "abstract": "Effects of postharvest treatment with 1-MCP(1-menthylcyclopropene)on persimmon fruits(Disopyros kaki L.'Mopanshi')are investigated at(20±1)℃.The results showed that 1-MCP evidently slowed down the decrease of flesh firmness,decreased respiration rate and delayed appearing time of respiration peak and ripening and softening and 1-MCP significantly inhibited persimmon fruits ethylene evolution,and extended postharvest storage life.", "keywords": [ "mopan persimmon", "1-MCP", "respiration rate", "ethylene evolution", "flesh firmness" ], "authors": [ { "name": "WANG Hua-rui", "org": "Institute of Farm Products Storage and Freshening,SHanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Institute of Farm Products Storage and Freshening,SHanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Institute of Farm Products Storage and Freshening,SHanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG CHun-sheng", "org": "Institute of Farm Products Storage and Freshening,SHanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Storage and Process", "year": 2007 }, "szBVpUEy": { "id": "szBVpUEy", "title": "The Reasons and Preventive Measures of Storage Quality Deterioration of Red Fuji Apple in Jinnan Area", "abstract": "On the basis of deeply investigation and study on the problem such as flavor quality decline,superficial scald,flesh browning and storability decreased during the postharvest storage of Red Fuji apple in Jinan area,this paper summarized the reasons of storage quality deterioration of Red Fuji apple during pre-harvest and post-harvest links,and put forward corresponding preventive measures.", "keywords": [ "storage quality", "reason", "Red Fuji apple", "Jinnan area", "deterioration", "preventive measures" ], "authors": [ { "name": "FENG Zhi-hong", "org": "" }, { "name": "WANG Chun-sheng", "org": "" }, { "name": "WANG Liang", "org": "" }, { "name": "HU Ke-shan", "org": "" } ], "venue": "Storage and Process", "year": 2013 }, "zO0fDIpP": { "id": "zO0fDIpP", "title": "Advances of Research on Peach Postharvest Physiology and Storage Technology", "abstract": "This essay explains comprehensively the physiological change of the first of peaches during the period of its maturity and decay after its harvest,including respiratory intensity,ethylene evolution,enzyme activity,soluble solid content,titratable acid and VC.This essay also makes an introduction to the technology of peach-storing and preserving,including the technology of preharvest,prestorage and postharvest.", "keywords": [ "postharvest physiology", "peach", "advance", "preservation", "storage" ], "authors": [ { "name": "Zhang Xiaoyu", "org": "Farm Product Storage and Frenshening Institute Shanxi Academy of Agri Sciences,Taiyuan " }, { "name": "Wang Chunsheng", "org": "Farm Product Storage and Frenshening Institute Shanxi Academy of Agri Sciences,Taiyuan " }, { "name": "Zhao Guifang", "org": "Farm Product Storage and Frenshening Institute Shanxi Academy of Agri Sciences,Taiyuan " }, { "name": "Zhang He", "org": "Farm Product Storage and Frenshening Institute Shanxi Academy of Agri Sciences,Taiyuan " } ], "venue": "Chinese Agricultural Science Bulletin", "year": 2008 }, "2m480D67": { "id": "2m480D67", "title": "Morphological and molecular identification of pathogenic fungal strains on postharvest Dongzao jujube fruit during cold storage", "abstract": "Nine pathogenic fungal strains on Dongzao jujube in China were identified and analyzed according to the morpho-logical characteristics and ITS sequences. Morphological studies showed that strains DH2,DH4,DJ3,DJ4,LW3 and LW5 generated spores on potato dextrose agar plates and slides. Strain LW4 generated distinct conidiomata and single-celled oval conidia. Strains DH4,DJ3,DJ4 and LW5 produced muriform conidia. The rDNA ITS regions of these pathogens were ampli-fied by PCR and then sequenced. After analyses of their ITS sequences, a phylogenetic tree was obtained from the program NJ (Neighbor-joining), together with the sequence of related strains which were downloaded from GenBank. The results of morphological observation and molecular detection of these nine strains showed that DH4, DJ3, DJ4 and LW5 belong to Al-ternaria spp.; DH1 and LW4 belong to Phomopsis spp.; DH2 belongs to Phoma sp.; LW3 belongs to Exserohilum rostratum and DJ5 belongs to Stemphylium sp.", "keywords": [ "Morphological characteristics", "Diseases", "Identification", "Dongzao jujube", "ITS sequence analysis" ], "authors": [ { "name": "TIAN Yun-hui", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan,Shanxi China;College of Biological Science and Biotechnology, Beijing Forestry University, Beijing China" }, { "name": "XUE Meng-lin", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan,Shanxi China" }, { "name": "ZHAO Guo-zhu", "org": "College of Biological Science and Biotechnology, Beijing Forestry University, Beijing China" }, { "name": "ZHANG Li-zhen", "org": "College of Life Science and Biotech-nology, Shanxi University, Taiyuan,Shanxi China" }, { "name": "WANG Chun-sheng", "org": "Institute of Agricultural Product Storage and Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan,Shanxi China" } ], "venue": "Journal of Fruit Science", "year": 2010 }, "JJRl878I": { "id": "JJRl878I", "title": "Effect of O_2 and CO_2 concentration on respiration,relative electrical conductivity,contents of chlorophyll and skin color of Dongzao jujube fruit", "abstract": "In order to further explore the effects of controlled atmosphere(CA) on Dongzao jujube fruit quality during storage,the effects of 8 different treatments with gas compositions(15%O2+0%CO2,10%O2+0%CO2,5%O2+0%CO2,2%O2+0%CO2,2%O2+2%CO2,2%O2+4%CO2,2%O2+8%CO2,2%O2+10%CO2) and one CK(21%O2+0%CO2) on respiration intensity,relative electrical conductivity,contents of chlorophyll and fruit skin color of Dongzao jujube cultivar were studied under the condition of low temperature(-1 to-2 ℃).The results showed that appropriate low concentration of O2 could result in the reduction of Dongzao jujube’s respiratory intensity,slow down the increase of pulp’s relative electrical conductivity,delay the degradation of chlorophyll in fruit and retard fruit skin changing to red;but CO2 could accelerate fruit respiration,causing increase of pulp’s relative electrical conductivity,promoting degradation of chlorophyll and fruit skin changing to red.The results indicated that the CA condition of 2%O2+0%CO2 was the best for storage of Dongzao jujube fruit.", "keywords": [ "Chlorophyll", "Relative electrical conductivity", "Zizyphus jujube cv.Dongzao", "Gas concentration", "Respiratory intensity", "Fruit skin color" ], "authors": [ { "name": "WANG Liang", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agricultural Sciences,Taiyuan,Shanxi China" }, { "name": "WANG Hui-fang", "org": "College of Food Science and Engineering ,Shanxi Agricultural University,Taigu,Shanxi China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agricultural Sciences,Taiyuan,Shanxi China" } ], "venue": "Journal of Fruit Science", "year": 2007 }, "QCwUBuB9": { "id": "QCwUBuB9", "title": "Research Status and Development of Post-harvest Physiology Characteristics and Storage Techniques of Sweet Cherry", "abstract": "The post-harvest physiology characteristics of the sweet cherry were summaried, including respiration, ethylene production, pulp nutrients, browning and softening. Seven kinds of storage technologies were listed in the paper. Some questions at recent and prospections in future on the sweet cherry storage were expouned.", "keywords": [ "storage technology", "post-harvest physiology", "sweet cherry" ], "authors": [ { "name": "SHI Jun-feng", "org": "ResearchInstituteofAgriculturalProductsStorage&FreshKeeping,ShanxiAcademyofAgriculturalScience,Taiyuan,China" }, { "name": "XUE Meng-lin", "org": "ResearchInstituteofAgriculturalProductsStorage&FreshKeeping,ShanxiAcademyofAgriculturalScience,Taiyuan,China" }, { "name": "WANG Chun-sheng", "org": "ResearchInstituteofAgriculturalProductsStorage&FreshKeeping,ShanxiAcademyofAgriculturalScience,Taiyuan,China" }, { "name": "LI Jian-hua", "org": "ResearchInstituteofAgriculturalProductsStorage&FreshKeeping,ShanxiAcademyofAgriculturalScience,Taiyuan,China" } ], "venue": "Storage & Process", "year": 2009 }, "afVJfYRG": { "id": "afVJfYRG", "title": "Research of Fresh-storage Technology for Japan-corea Pear and Its Utilization Devolopment", "abstract": "In this paper, some factors such as variety, pick-period, storage temperature and storage gas effected on Japan-corea pear for fresh-storage have been expounded, the fresh-storage methods of the native store-caves, refrigerator, CA and MA, and also their utilizations have been summarized. The research of the fresh-storage for Japan-corea pear has been discussed as well.", "keywords": [ "expectation", "japan-corea pear", "fresh-storage" ], "authors": [ { "name": "YAN Gen-zhu", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan , China" }, { "name": "LI Jian-hua", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan , China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan , China" } ], "venue": "Storage & Process", "year": 2007 }, "vY8u0YTz": { "id": "vY8u0YTz", "title": "Effects of Various Controlled Atmosphere Treaments to the Quality of \"Okubao\" Peach Fruit during Cold Storage and Shelf-life", "abstract": "The effect of the static controlled atmosphere(CA) ,intermittent controlled atmosphere(ICA) and dynamic controlled atmosphere(DCA) on the quality of \" Okubao\" peach at 0℃ for 70 d and subsequent shelf-life at 15℃ for 3 d was investigated. The results showed that CA treatments significantly alleviated the harm to flesh tissue and chilling-sensitivity,delayed the chilling-induced increase of membrane permeability and reduced flesh browning, decreased the juice extraction rate,kept preferable firmness,flavor,colour,improved quality after cold storage in comparison with the control,but the soluble solid content of the fruit has not been affected obviously. The combination of 10% CO2 with 5% O 2 was recommended CA storage conditions for\" Okubao\" peach. Compared with the static CA storage,the DCA treatment significantly postponed the symptom of chilling injury appearing and lightened the degree of chilling injury of \" Okubao\" peach fruits and reduced flesh browning and maintained post-storage fruit quality at 0℃ for 70 d and subsequent shelf-life at 15℃ for 3 d.", "keywords": [ "Okubao peach", "Dynamic controlled atmosphere", "Quality", "Controlled atmosphere storage" ], "authors": [ { "name": "ZHAO Ying-li", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" }, { "name": "WANG Liang", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" }, { "name": "YAN Gen-zhu", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" }, { "name": "SHI Jun-feng", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "Insitute of Farm Produce Storage and Fresh Keeping,Shanxi Academy of Agricultual Sciences,Taiyuan ,China" } ], "venue": "Acta Agriculturae Boreali-Sinica", "year": 2010 }, "JR4a2Kos": { "id": "JR4a2Kos", "title": "Advances of Research on Postharvest Physiology and Storage Technology of \"Okubao\" Peach", "abstract": "In this paper, the research of postharvest physiological and storage characteristics of \"okubao\" peach fruit in recent years has been intrduced. \"okubao\" peach is a climacteric fruit. The main questions involved in the storage of \"okubao\" peach include the quickly decreasing of titratable acidity and vitamin C content, browning of flesh, losing water, softening and decay,losing flavor,chilling. The main preservation technologies of \"okubao\" peach include physical technologies (for example, the prestorage heat treatment, intermittent warming, air-control storage) and chemical technologies(for example, coating, salicylic acid, calcium dipping, ethanol treatment), which can extend the storage period and improve the storage quality. The paper is of some reference value to conducting researches.", "keywords": [ "postharvest physiology", "okubao peach", "storage" ], "authors": [ { "name": "FENG Zhi-hong", "org": "College of Food Science and Engineering,Shanxi Agricultural University,Taigu ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Ru-fu", "org": "College of Food Science and Engineering,Shanxi Agricultural University,Taigu ,China" } ], "venue": "Storage & Process", "year": 2008 }, "GhG4Dhar": { "id": "GhG4Dhar", "title": "Effect of Controlled Atmosphere Storage on Quality of Yellow Pear Fruit", "abstract": "Compare the studies of different gases at 0 ℃ on quality and browning of core and sarcoarp of yellow pear were carried out. The results showed that, the effective of CO2 concentration is more significant than O2 concentration. Under higher CO2 concentration (5%) conditions, the fruit firmness could be maintained, but the internal ethylene release was increased, permeability of cell membranes and the browning of fruit core were increased too. Appropriate combination of gases is about 25% O2 and concentration of CO2 less than 1%. Under these conditions, the pear can be stored for five to six months.", "keywords": [ "physiological changes", "browning", "CA storage", "yellow pear" ], "authors": [ { "name": "YAN Gen-zhu", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shan xi Academy of Agricultural Sciences,Taiyuan,China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shan xi Academy of Agricultural Sciences,Taiyuan,China" }, { "name": "ZHAO Ying-li", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shan xi Academy of Agricultural Sciences,Taiyuan,China" }, { "name": "WANG Liang", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shan xi Academy of Agricultural Sciences,Taiyuan,China" }, { "name": "WANG Hua-rui", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shan xi Academy of Agricultural Sciences,Taiyuan,China" }, { "name": "ZHANG Xiao-yu", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shan xi Academy of Agricultural Sciences,Taiyuan,China" } ], "venue": "Storage & Process", "year": 2009 }, "5eSeSzQU": { "id": "5eSeSzQU", "title": "Study on respiration mechanism of post-harvest betel nut fruit", "abstract": "Static and infrared methods were used to measure respiration of betel nut in different condition.Effects of betel nut to ethylene were verified by treating betel nut fruit with ethephon.The results showed that betel nut fruit post-harvest respiration was climacteric respiration.", "keywords": [ "respiration mechanism", "study", "betel nut" ], "authors": [ { "name": "XIA Bing", "org": "Institute of Farm Product Processing and Design,Hainan Academy of Agricultural Sciences,Haikou,Hainan ,China;Food College of Hainan University,Haikou,Hainan ,China" }, { "name": "JI Jian-bang", "org": "Institute of Farm Product Processing and Design,Hainan Academy of Agricultural Sciences,Haikou,Hainan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science,Taiyuan,Shanxi,China" }, { "name": "KANG Xiao-ning", "org": "Institute of Farm Product Processing and Design,Hainan Academy of Agricultural Sciences,Haikou,Hainan ,China" }, { "name": "WANG Hai-can", "org": "Hainan Wanning Fangzhengyuan Industrial Co.,Ltd,Wanning,Hainan ,China" } ], "venue": "Food & Machinery", "year": 2010 }, "yo9PX1nb": { "id": "yo9PX1nb", "title": "Primary Research of CA Storage on Yuanhuan Pear", "abstract": "An effect of CA indexes on yuanhuan pear was studied in this paper. The results showed that CA storage restrained the fruit respiration, decreased fruit depletion, keep fruit hardness in order to increase the fruit quality. The fitting gas combination can delay the fruit caducity, control fruit browning and prolong fresh-storage period. 5%O2 + 0%~1% CO2 is the best gas index for the fresh-storage of yuanhuan pear for long time.", "keywords": [ "CA storage", "yuanhuan pear", "fruit browning" ], "authors": [ { "name": "YAN Gen-zhu", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "WANG Liang", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan ,China" }, { "name": "SHI Jun-feng", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences, Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2007 }, "FCQb0xPs": { "id": "FCQb0xPs", "title": "Preservation Technology and Factors Affecting the Quality of Sweet Potato During Storage", "abstract": "Main factors influencing quality of sweet potato during storage were analyzed, and the preservation technologies of sweet potato were also introduced.", "keywords": [ "affecting factors", "preservation technology", "sweet potato" ], "authors": [ { "name": "ZHANG Li-xin", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "FENG Zhi-hong", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2010 }, "qplcqWtG": { "id": "qplcqWtG", "title": "Study on Ice-Temperature CA Storage of Red Fuji Apple", "abstract": "Effect of different gas compositions on physiology and storage quality of the red fuji apple fruit was studied,under the condition of the ice temperature,and the reasonable parameters of the ice-temperature controlled atmosphere storage of red fuji apples were explored.The results showed that,freezing point of 80% mature red fuji apples was-1.5 ℃,and there was a significant negative correlation between the freezing point temperature and the fruit maturity.The appropriate ice temperature CA storage significantly inhibited the red fuji apple respiration rate and the ratio of ethylene production,slowed down the relative conductivity raise of the organization,mitigation flesh firmness and soluble solids(TSS) decreased,the fruits still maintained good quality after storage for 8 months.The combination of 1%～3%O2 with CO2<2% was recommended ice-temperature CA storage conditions for red fuji apple.", "keywords": [ "red fuji apple", "ice temperature", "controlled atmosphere(CA) storage" ], "authors": [ { "name": "ZHAO Meng", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Liang", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Chao", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Li-xin", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2010 }, "y1eYX3T6": { "id": "y1eYX3T6", "title": "Inhibitory Effect of Metschnikowia zizyphicola XY201 on Fungal Pathogens of Postharvest Jujube Fruits", "abstract": "Culture time for maximum biomass,activity under different environmental conditions and the inhibitory effect of Metschnikowia zizyphicola XY201 against the four fungal pathogens of postharvest jujube fruits were investigated in this study.Results showed the maximum biomass(3.84×108 cfu/ml) of strain XY201 in NYDB broth emerged after 96 h incubation.Viability of strain XY201 varied under different temperatures and media.Strain XY201 cultured in liquid medium at 0℃ kept the highest viability and concentration of XY201 remained 6.46×107 cfu/ml after 240 d incubation.Strain XY201 significantly inhibited spore germination and hyphal elongation of Penicillium expansum,Alternaria alternate,Aspergillus niger and Rhizopus nigricans when co-cultured in PDB.M.zizyphicola XY201 at the concentration of 5×108 cfu/ml completely inhibited the growth of the four fungal pathogens.Inhibitory activity of strain XY201 against A.alternate was 42.59% by dual culture on PDA medium.", "keywords": [ "Dong jujube", "inhibitory effect", "fungal pathogens", "Metschnikowia zizyphicola XY201" ], "authors": [ { "name": "SHI Jun-feng", "org": "Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "XUE Meng-lin", "org": "Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Liang", "org": "Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Chinese Journal of Biological Control", "year": 2010 }, "T5EGx3gK": { "id": "T5EGx3gK", "title": "Effect of Different Plastic Packing on Fruit Quality of Friar Plum during Cold Storage", "abstract": "Effect of different plastic film package on fruit quality and preservation of Friar plum during storage were studied in this paper.After 2 months storage in(0～1) ℃,the fruit quality with 0.03 mm PVC was the best;though the percent of good fruits with 0.02 mm and 0.05 mm polyethylene(PE) packing were higher than 92%,the pulp had little chilling injury.After storage,the fruit firmness and the titratable acidity declined,the soluble solid content and the electrical conductivity of pulp rised compared with that before storage.", "keywords": [ "Cold storage", "Fruit quality", "Friar plum", "Package" ], "authors": [ { "name": "WANG Hua-rui", "org": "Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China;College of Chemistry and Chemical Engineering,Shanxi University,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "YAN Gen-zhu", "org": "Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LIU Lian-sheng", "org": "Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Journal of Shanxi Agricultural Sciences", "year": 2010 }, "xxBYGYa8": { "id": "xxBYGYa8", "title": "Comparation on Post-harvest Physiology and Storage Property of Different Pear Species from Japan and Korea", "abstract": "Three pear species,fengshui pears,yuanhuang pears and golden pears were used as test materials,which stored in PE bags at the temperature of 0 ℃ to do comparative tests for post-harvest physiology and storage property. The results showed that the core and flesh of fengshui pears were not easy to be brown,but the flesh was easy to be soften. The core and flesh of yuanhuang pears were easy to be brown. The flesh of golden pears was not easy to be brown but except the core. In the test,golden pear had the best storage property,feng-shui pear was better,but yuanhuang pear was the last one.", "keywords": [ "golden pears", "yuanhuang pear", "storage property", "post-harvest physiology", "fengshui pear" ], "authors": [ { "name": "YAN Gen-zhu", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Liang", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Li-xin", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2009 }, "hMlyQTkw": { "id": "hMlyQTkw", "title": "Effects of Modified Atmosphere Package on the Quality of Prunus americana Fruit during Storage", "abstract": "In this paper,effect of modified atmosphere package on Prunus americana fruit was studied.The results showed that PE,PVC and CO2 hypertonic package treatments significantly inhibited the reduction of fruit firmness and titratable acid content and delayed aging of the Prunus americana fruit in comparison with CK.PE package of 0.02 mm thickness was more suitable for the Prunus americana fruit to keep good quality after 75 days storage under 0 ℃.", "keywords": [ "fresh keeping", "quality", "modified atmosphere", "different packages", "Prunus americana" ], "authors": [ { "name": "ZHANG Li-xin", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "FENG Zhi-hong", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "CHEN Jia", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Liang", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Journal of Shanxi Agricultural Sciences", "year": 2011 }, "g54C22ic": { "id": "g54C22ic", "title": "Effect of Controlled Atmosphere Storage on Qulity of Yuluxiang Pear", "abstract": "Influences of different O_2,CO_2 composition on the post-harvest physiological and storage quality of yuluxiang pear were studied at(0±1)℃.The results showed that appropriate low O_2 concentration could delay the decline of fruit firmness and soluble solids,slow increasing of pulp's relative electrical conductivity,suspend reduction of phenolic substances and ascend of PPO activity.The suitable O_2,CO_2 composition for CA storage of yuluxiang pear is CO_2<1%,O_2 5%～10%.", "keywords": [ "controlled atmosphere storage", "browning", "yuluxiang pear" ], "authors": [ { "name": "WANG Chun-sheng", "org": " Institute of Farm Product Storage and Freshening,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": " Institute of Farm Product Storage and Freshening,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Hua-rui", "org": " Institute of Farm Product Storage and Freshening,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": " Institute of Farm Product Storage and Freshening,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "SHI Jun-feng", "org": " Institute of Farm Product Storage and Freshening,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": " Institute of Farm Product Storage and Freshening,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2007 }, "OGBilmXk": { "id": "OGBilmXk", "title": "Effect of Gas Composition on Fruit Quality of Friar Plum during Modified Atmosphere Cold Storage", "abstract": "Friar plum(Prunus salicina Lindl.) was used as the raw material to explore the effect of gas composition on fruit quality and preservation of fruits during modified atmosphere cold storage.The results showed that the optimal gas composition for the storage of Friar plum was composed of O2 ≥ 2% and CO2 ≤ 5%.Under the optimal gas conditions,the storage life of plum fruits at 0-1 ℃ exceeded 3 months.After the storage,fruit firmness and the contents of titratable acids in fruits were declined.The conductivity of pulp was increased when compared with pre-storage.The percentage of good fruits was higher than 85% and the rotting rate was less than 10%.In addition,the color and flavor of fruits were normal.", "keywords": [ "Friar Prunus salicina", "fruit quality", "controlled atmosphere storage" ], "authors": [ { "name": "WANG Hua-rui", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China;College of Chemistry and Chemical Engineering,Shanxi University,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "YAN Gen-zhu", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LIU Lian-sheng", "org": "Research Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Food Science", "year": 2011 }, "JT5eUwoP": { "id": "JT5eUwoP", "title": "Effect of Storage Temperature on Physiologies and Changes of Fruit Quality of Friar Plum During Post-harvest", "abstract": "Effect of the storage temperature on physiologies and changes of fruit quality of friar plum during storaging were studied in this paper. After 30 days of being storaged,the fruit firmness and the titratable acidity declined,the soluble solid content rised compared with before being storaged. The fruit of (0±0.5) ℃ and (8±0.5) ℃ had no obvious chilling injury,the shelf life could be up to 10 and 5 days after being storaged. The chilling injury of the plum was relatively severer at the temperature of (5±1) ℃,its pulp was translucency with the strange acid flavor as been poached.", "keywords": [ "fruit quality", "friar plum", "temperature", "storage" ], "authors": [ { "name": "WANG Hua-rui", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Science,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Science,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Science,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Science,Taiyuan ,China" }, { "name": "SHI Jun-feng", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Science,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "Research Institute of Agricultural Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Science,Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2010 }, "2gHbvDgh": { "id": "2gHbvDgh", "title": "Effect of Heat Treatment on Fresh-cut Pineapple", "abstract": "To explore the effectiveness of pre-storage heat treatment on quality maintenance of fresh-cut pineapples,which are dipped in water at either 40 ℃ for 20 min,45 ℃ for 15 min or 50 ℃ for 10 min before stored at 8 ℃.The main physiological and quality parameters are monitored during storage at the intervals of one day.The results indicate that heat treatment has beneficial effects on delaying senescence and maintaining quality in fresh-cut pineapple in comparison with control,treatments at 45 ℃ for 15 min maintains higher level of VC contents,Peroxidase and Catalase,keep histiocytic integrity and quality in comparison with 40 ℃ for 20 min and 50 ℃ for 10 min.", "keywords": [ "storage quality", "fresh-cut pineapple", "heat treatment" ], "authors": [ { "name": "Chen Huiyan", "org": "Institute ofFarmProductStorage and Fresh-keeping,Shanxi AcademyofAgriculture Science,Taiyuan,Shanxi ,China" }, { "name": "Feng Zhihong", "org": "Institute ofFarmProductStorage and Fresh-keeping,Shanxi AcademyofAgriculture Science,Taiyuan,Shanxi ,China" }, { "name": "Chen Jia", "org": "Institute ofFarmProductStorage and Fresh-keeping,Shanxi AcademyofAgriculture Science,Taiyuan,Shanxi ,China" }, { "name": "Wang Chunsheng", "org": "Institute ofFarmProductStorage and Fresh-keeping,Shanxi AcademyofAgriculture Science,Taiyuan,Shanxi ,China" } ], "venue": "Academic Periodical of Farm Products Processing", "year": 2010 }, "E5FnCglg": { "id": "E5FnCglg", "title": "Effect of CA Storage on Post-harvest Storage Quality of Dongzao Jujube", "abstract": "In order to further explore the effects of controlled atmosphere(CA) on Dongzao jujube fruit quality during storage,the effects of 8 different treatments with gas compositions(15%O2+0%CO2,10%O2+0%CO2,5% O2+0%CO2,2%O2+0%CO2,2%O2+2%CO2,2%O2+4%CO2,2%O2+8%CO2,2%O2+10%CO2) and one ck(21%O2+ 0%CO2) on respiratory intensity,relative electrical conductiveity,relative pulp firmness,VC content and storage quality of dongzao jujube fruit were studied under the condition of low temperature(-1to-2 ℃) . The results showed that,appropriate low concentration of O2 could result in the reduction of dongzao jujube's respiratory intensity,slow down the increase of pulp's relative electrical conductivity,restrict lowering of relative pulp firmness,delay the degradation of VC,and maintain storage quality of fruits. But CO2 could accelerate fruit respiration,causing increase of pulp's relative electrical conductivity,promoting degradation of VC,accelerating the softening of jujube,and the rapid loss of the value of fresh jujube. The research showed that the CA index of 2% O2+0%CO2 was the most beneficial to storage of dongzao jujube.", "keywords": [ "dongzao jujube", "storage quality", "CA storage" ], "authors": [ { "name": "WANG Liang", "org": "Research Institute of Agricultural Product Storage and Fresh keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Research Institute of Agricultural Product Storage and Fresh keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "YAN Gen-zhu", "org": "Research Institute of Agricultural Product Storage and Fresh keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Research Institute of Agricultural Product Storage and Fresh keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Research Institute of Agricultural Product Storage and Fresh keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2009 }, "uijq829d": { "id": "uijq829d", "title": "Research Progress on Storage Technique of Fresh-cut Fruits and Vegetables", "abstract": "In this paper,influencing factors of quality of fresh-cut fruits and vegetables included temperature, microorganism and loss of nutrients were analyzed. The research progress on which were physical storage technologies, chemical storage technologies and biological storage techniques of fresh-cut fruits and vegetables at home and abroad have been expatiated.", "keywords": [ "browning", "preservation techniques", "quality", "fresh-cut fruits and vegetables" ], "authors": [ { "name": "LI Chao", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "FENG Zhi-hong", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "CHEN Hui-yan", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Science, Taiyuan ,China" } ], "venue": "Storage & Process", "year": 2010 }, "7Xlxuw1N": { "id": "7Xlxuw1N", "title": "Effect of Ethylene Absorbent on Fengshui Fruit Softening and Its Cell Wall Metabolism", "abstract": "In order to investigate the ethylene absorbent by regulatory environment ethylene and to inhibit the pear fruit softening, the author studied on the effect of ethylene absorbent on the fruit firmness, ethylene production, the pear cell wall metabolism during fruit cold storage under 0℃ conditions, using Fengshui pear as the test materials covered with PE 18 μm fresh-keeping bag. The results indicated that: the pear fruit was softening after the high peak of the ethylene release. There was a significantly positive correlation between the fruit ethylene release and the ethylene concentration environmental in the bag, but there was a significant negative correlation between the fruit firmness and the soluble pectin content. The ethylene absorbent to the environment ethylene regulation inhibited the fruit ethylene release and PME, PG activity, limited the pectin degradation speed, thus it was effectively to keep the fruit firmness and delay the fruit softening process.", "keywords": [ "fruit softening", "Fengshui pear", "ethylene absorbent", "storage" ], "authors": [ { "name": "Yan Genzhu", "org": " The Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences , Taiyuan " }, { "name": "Zhao Yingli", "org": " The Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences , Taiyuan " }, { "name": "Wang Liang", "org": " The Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences , Taiyuan " }, { "name": "Feng Zhihong", "org": " The Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences , Taiyuan " }, { "name": "Wang Chunsheng", "org": " The Research Institute of Agricultural Product Storage & Fresh Keeping, Shanxi Academy of Agricultural Sciences , Taiyuan " } ], "venue": "Chinese Agricultural Science Bulletin", "year": 2013 }, "ZHSwfjhd": { "id": "ZHSwfjhd", "title": "Inhibiting Effects of Metschnikowia zizyphicola Strain XY201 on Black Spot and Blue Mold of Fresh Jujube‘Dongzao' During Storage", "abstract": "The colonization of Metschnikowia zizyphicola strain XY201 on the surfaces and in the wounds of jujube ‘Dongzao' fruits and the biological control of black spot and blue mold of postharvest jujubes by M.zizyphicola strain XY201 were studied.The results showed that the suspension of M.zizyphicola strain XY201 and its cooperation with sodium bicarbonate or Sportak had rapid population growing on the surfaces and in the wounds of fruits.In the conditions of 20 ℃,controlled atmosphere (CA/0 ℃)storage and modified atmosphere(MA/0 ℃)storage,the population of antagonistic yeast XY201 on the surfaces of fruits was 2.2 × 106-2.6 × 106(4 d after inoculated),6.3 × 105-9.7 × 105(60 d)and 4.0 × 105-1.1 × 106 CFU(75 d),respectively,which increased 34.3-57.0,15.2-25.5 and 4.8-20.3 times respectively compared to the inoculating start point.The population of antagonistic yeast XY201 in the wounds of fruits was 1.9 × 107-3.6 × 107(8 d),1.2 × 107-1.8 × 107(30 d)and 8.4 × 106-1.2 × 107 CFU(60 d),respectively,which increased 34.2-364.3,16.9-144.3 and 11.2-90.0 times than that of the inoculating start point,respectively.When M.zizyphicola strain XY201 at 1 × 108 CFU · mL-1 concentration was combined with 2% sodium bicarbonate or 50 μg · mL-1 Sportak,the colonization on the surfaces and in the wounds of jujube fruits was inhibited in the early period,then had no significant effect in the later period.When fruits were stored in the condition of CA(0 ℃,2%-8% O2 and 0% CO2),the suspending liquid of M.zizyphicola strain XY201 at 1 × 108 CFU · mL-1 concentration provided complete control of black spot,the disease rate decreased 52.5%-59.2%,the diameter of spot declined 5.9%-10.7%.The biological control of blue mold was not obvious,the disease rate only decreased 3.6%-6.1%,the diameter of spot declined 11.3%-19.0%.", "keywords": [ "jujube", "blue mold", "inhibitory effect", "antagonists", "black spot", "storage" ], "authors": [ { "name": "WANG Liang", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "XUE Meng-lin", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "SHI Jun-feng", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "The Institute of Agricultural Product Storage and Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Acta Horticulturae Sinica", "year": 2010 }, "gtyANVIP": { "id": "gtyANVIP", "title": "Studies on the Varieties of Pathogenic Fungi and the Infection Patterns in Housui during Storage Stage", "abstract": "The species of pathogenic fungi and their infection ways of rot disease during storage-stage in Housui were studied.Eight varieties of pathogenic fungi were obtained in the separation process.The test results showed that the pathogenic capabilities among the 8 fungi was different.Alternaria alternate,Penicillium citrinum and Gliocladium roseum were identified as the main causative fungi of rot disease during storage stage.", "keywords": [ "pathogenic fungi", "storage-stage", "infection pattern", "Housui" ], "authors": [ { "name": "SHI Jun-feng", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "XUE Meng-lin", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHANG Xiao-yu", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farming Product Storage & Fresh Keeping,Shanxi Academy of Agricultural Sciences,Taiyuan ,China" } ], "venue": "Journal of Shanxi Agricultural Sciences", "year": 2011 }, "fSTgRqkt": { "id": "fSTgRqkt", "title": "Effects of Dynamic Controlled Atmosphere on Quality of ‘Okubo' Peach During Storage and Shelf-life", "abstract": "The changes in physiological characteristics,chilling injure symptoms and sensory quality of Okubo peach stored in dynamic controlled atmosphere(DCA),in controlled atmosphere(CA)and in air (control),during storage-life at 0-1 ℃ for 70 d and subsequent shelf-life at 20 ℃ for 3 d,were investigated in this study.The results showed that DCA and CA treatments significantly inhibited fruit rot and flesh browning,kept firmness,alleviated the harm to flesh tissue and chilling-sensitivity,improved quality after storage in comparison with control.The Okubo peaches kept in DCA showed a better storability than that in CA.", "keywords": [ "dynamic controlled atmosphere", "quality", "peach", "storage" ], "authors": [ { "name": "FENG Zhi-hong", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "ZHAO Ying-li", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "YAN Gen-zhu", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "LI Jian-hua", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "WANG Liang", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "SHI Jun-feng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "WANG Hua-rui", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" }, { "name": "WANG Chun-sheng", "org": "Institute of Farm Product Storage and Fresh-keeping,Shanxi Academy of Agriculture Sciences,Taiyuan ,China" } ], "venue": "Acta Horticulturae Sinica", "year": 2010 }, "R7oSog1M": { "id": "R7oSog1M", "title": "Optimization of laser welding parameters of stainless steel vehicle body based on response surface methodology", "abstract": "For resolving the problems of resistant spot welding of stainless steel railway vehicles' body, such as poor surface quality and bad airtight, the experiment program was designed by the quadratic regression rotation design plan. The mathematical model between the laser welding parameters (laser power, welding speed and defocusing volume) and the response values (joint tensile strength, penetration and weld width) was established based on the response surface methodology (RSM). According to the demand of surface quality and strength of the joint, the model can be used to optimize the laser welding process parameters and prospect shear tensile strength, penetration, weld width of the joint for getting the optimal combination of the appearance and strength of the joint, which improves the surface quality of the stainless steel vehicle body.", "keywords": [ "Laser welding", "Optimization of process parameters", "Response surface methodology" ], "authors": [ { "name": "Hongxiao Wang", "org": "Dalian Jiaotong University(Dalian Jiaotong University ^),Dalian,China" }, { "name": "Chunyuan Shi", "org": "Dalian Jiaotong University(Dalian Jiaotong University ^),Dalian,China" }, { "name": "Chunsheng Wang", "org": "Changchun Railway Vehicles Co., Ltd.(Changchun Railway Vehicles Co., Ltd.,Changchun Railway Vehicles Co. Ltd.),Changchun,China" }, { "name": "Ting Wang", "org": "Changchun Railway Vehicles Co., Ltd.(Changchun Railway Vehicles Co., Ltd.,Changchun Railway Vehicles Co. Ltd.),Changchun,China" } ], "venue": "Hanjie Xuebao/Transactions of the China Welding Institution", "year": 2010 }, "M01ztgtp": { "id": "M01ztgtp", "title": "Numerical simulation of the welding deformation for the side sill of the bogie frame based on local-global method", "abstract": "Considering the limitation of computational capacity, a new finite element solution is used to simulate the welding deformation of the side sill of railroad car' s bogie frame based on the local-global method. Firstly, a volumetric heat source defined by a double ellipsoid is adopted to simulate the thermal distributions of the arc welding process. And then, the local models extracted from the global model are computed with refined meshes. On these bases, the global distortions of the subject studied are ascertained by transferring the inner forces of computed local models to the global model. It indicates that the local-global method is feasible for simulating the large welded structures by comparing the computed results with the corresponding actual measured values. The work provides basis for optimizing the welding sequence and clamping conditions, and has theoretical values and engineering significance in the integral design, manufacturing technique selection of the bogie frame, as well as other kinds of large welded structures.", "keywords": [ "Local-global method", "Numerical simulation", "Welding deformation" ], "authors": [ { "name": "Xinhua Yang", "org": "Dalian Jiaotong University(Dalian Jiaotong University ^),Dalian,China" }, { "name": "Chunsheng Wang", "org": "Changchun Railway Vehicles Co., Ltd.(Changchun Railway Vehicles Co., Ltd.,Changchun Railway Vehicles Co. Ltd.),Changchun,China" }, { "name": "Li Chang", "org": "Changchun Railway Vehicles Co., Ltd.(Changchun Railway Vehicles Co., Ltd.,Changchun Railway Vehicles Co. Ltd.),Changchun,China" }, { "name": "YaNa Li", "org": "Dalian Jiaotong University(Dalian Jiaotong University ^),Dalian,China" }, { "name": "Wenzhong Zhao", "org": "Dalian Jiaotong University(Dalian Jiaotong University ^),Dalian,China" } ], "venue": "China Welding (English Edition)", "year": 2007 }, "JZuoCEmC": { "id": "JZuoCEmC", "title": "Study on Laser Welding Process for Stainless Steel Railway Vehicle", "abstract": "The partial penetration lap laser welding is a solution for the disadvantages of resistant spot welding stainless steel railway vehicles such as poor surface quality and poor airtight. The effects of the laser welding process parameters such as laser power, welding speed and focused distance on the shape of the weld seam and the shear tensile strength were investigated . The optimal parameters are P=2.0kW,v=22mm/s, F=0mm at which the joint has higher shear tensile strength than that of RSW and no welded traces on the exterior surface of the car body. The work can afford pilot basis for the application of laser welding in stainless steel railway vehicles manufacturing.", "keywords": [ "process parameters", "stainless steel railway vehicle", "lap laser welding" ], "authors": [ { "name": "WANG Hongxiao", "org": " Dalian Jiaotong University, Dalian , China" }, { "name": "SHI Chunyuan", "org": " Dalian Jiaotong University, Dalian , China" }, { "name": "WANG Chunsheng", "org": " Changchun Railway Vehicles Co., LTD., Changchun , China" }, { "name": "WANG Ting", "org": " Changchun Railway Vehicles Co., LTD., Changchun , China" }, { "name": "XIAO Jingfei", "org": " Changchun Railway Vehicles Co., LTD., Changchun , China" } ], "venue": "Hot Working Technology", "year": 2009 }, "rZQayJgd": { "id": "rZQayJgd", "title": "Dynamic design and simulation on bogie of railway carriage based on numerical prototype", "abstract": "Numerical prototype that takes the simulation as a core is a typical application of virtual reality technique in the industrial community,and an important means for raising the designing quality and efficiency of industrial products.Start from the requirements of the design on bogie of railway carriage,this paper put forward the dynamic design of bogie,and the processes for frame structure and design of simulation platform.Combining with the designing process of typical component parts and from the aspects of structural design,mechanical physical performance and machining technological simulation etc. an exposition on the key technology and methodology of bogie dynamic design and simulation based on numerical prototype technology was carried out.", "keywords": [ "simulation", "dynamic design", "bogie", "numerical prototype" ], "authors": [ { "name": "YANG Xin-hua", "org": "CAD/CAE Center,School of Mechanical Engineering,Dalian Jiaotong University,Dalian ,China;Changchun Railway Vehicles Limited-liability Company,Changchun ,China" }, { "name": "CHANG Li", "org": "Changchun Railway Vehicles Limited-liability Company,Changchun ,China" }, { "name": "WANG Chun-sheng", "org": "Changchun Railway Vehicles Limited-liability Company,Changchun ,China" }, { "name": "ZHAO Wen-zhong", "org": "CAD/CAE Center,School of Mechanical Engineering,Dalian Jiaotong University,Dalian ,China" } ], "venue": "Journal of Machine Design", "year": 2007 }, "kJ7A5APp": { "id": "kJ7A5APp", "title": "Simulation and Application of the Bogie Frame Welding Heat Source", "abstract": "In this paper,a double-ellipsoid heat source model was used for simulating the welding heat source of bogie frame.On this basis,the corresponding heat source models are simplified to meet the requirements of the computer capacity by extracting the average thermal cycling.The simplified heat source is validated by a computation example.", "keywords": [ "application", "welding heat source", "bogie frame", "simulation" ], "authors": [ { "name": "ZHANG Ze-yun", "org": "School of Traffic and Transportation Engineering,Dalian Jiaotong University,Dalian ,China" }, { "name": "YANG Xin-hua", "org": "School of Traffic and Transportation Engineering,Dalian Jiaotong University,Dalian ,China;Changchun Railway Vehicles Co.,Ltd,Changchun ,China" }, { "name": "WANG Chun-sheng", "org": "Changchun Railway Vehicles Co.,Ltd,Changchun ,China" }, { "name": "YANG De-hui", "org": "Changchun Railway Vehicles Co.,Ltd,Changchun ,China" }, { "name": "ZHAO Wen-zhong", "org": "School of Traffic and Transportation Engineering,Dalian Jiaotong University,Dalian ,China" } ], "venue": "Journal of Dalian Jiaotong University", "year": 2008 }, "7nPj52xz": { "id": "7nPj52xz", "title": "Influencing factors analysis of spontaneous knee joint osteoarthritis among middle aged and old aged pople in Xi'an", "abstract": "Objective:To explore the prevalence rate of knee joint osteoarthritis and its pathogenetic fea- tures among the middle-aged and old aged people in the urban and rural area of Xi'an.Methods:From May to October 2005,1538 Han nationality above 40 years in Xi'an were investigated according to strati- fied and cluster random sampling.The same questionnaire was delivered to subjects who had been given normotopia and lateral position radiographic examination in both knees.Excluded from etiological arthri- tis,some subjects with clinical symptoms and a radiographic grade (beyond Kellgren & Lawrence gradeⅡ) were finally diagnosed as spontaneous knee joint osteoarthritis.All analyses were performed with SPSS 13.0 and t test,U test.Single factor analysis and multiple logistic regression analysis were used to analyze dates.Results:The total prevalence of spontaneous knee joint osteoarthritis was 12.1% with 2.5% and 2.1% for right and left knees,respectively.The prevalence of knee joint osteoarthritis in wom- en was 2.5 times of that in men (17.2% vs 6.8%,P=0.000).the osteophyte prevalence in women was 2.3 times of that in men (26.5% vs 11.4%,P=0.000).The prevalence of knee joint osteoarthritis and osteophyte increased with the growth of age.So did the symptomatic knee,except for the age group of 56- 60 years and 66-70 years.The prevalence of symptomatic knee joint for urban area was significantly higher than that for rural area (56.3% vs 45.3%,P=0.003).In women,the prevalence of knee joint os- teoarthritis increased significantly with the increasing of body mass index,which had not been observed in men.Female and obesity are the risk factors for osteoarthritis,but bean and its products and meat could prevent the osteoarthritis.Conclusion:Old age,female and obesity serve as risk factors for knee joint os- teoarthritis.", "keywords": [ "middle and old aged", "spontaneous", "epidemiology", "osteoarthritis", "knee", "rural area" ], "authors": [ { "name": "wei wang", "org": "" }, { "name": "kunzheng wang", "org": "" }, { "name": "xiaoqian dang", "org": "" }, { "name": "chuanyi bai", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "zhibin shi", "org": "" }, { "name": "ma shuqiang", "org": "" } ], "venue": "Journal of Medical Colleges of Pla", "year": 2007 }, "vP92VZR3": { "id": "vP92VZR3", "title": "Effects of olfactory ensheathing cells transplantation on neuron apoptosis after spinal cord injury", "abstract": "Aim: To investigate the effect of olfactory ensheathing cells(OECs) transplant on neuron apoptosis after spinal cord injury(SCI), and explore the mechanism of SCI treated with OECs. Methods: Spinal cord hemisection was performed in adult animals. OECs and culture medium were transplanted. The ratio of surviving neurons and the change of apoptosis were observed with hematoxylin-eosin(HE) staining and TUNEL method at 1 to 14 days after operation. Results: After spinal cord hemisection, the number of neurons in the spinal cord decreased with time. The peak of neuron apoptosis appeared on the 1st and 2nd day respectively after injury on the injured side and on the opposite side. Apoptosis of glial cells peaked at 7 days and declined at 14 days. OEC transplantation could reduce apoptosis of neurons after SCI and promote the survival rate of neurons. Conclusion: OEC transplantation after SCI has effect against apoptosis of nurons.", "keywords": [ "null" ], "authors": [ { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Zhibin Shi", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Junchang Chen", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Chinese Journal of Clinical Rehabilitation", "year": 2004 }, "ayT55vJ6": { "id": "ayT55vJ6", "title": "Changes of vessel in steroid-induced osteonecrosis of femoral head: experimental study of rabbits]", "abstract": "To investigate the changes of vessel function, vessel injury, blood viscosity and vessel regeneration in steroid-induced osteonecrosis of femoral head.Forty Chinese white rabbits were randomly divided into 2 equal groups to be injected with: horse serum intravenously twice with an interval of 3 weeks and than prednisone intraperitoneally once a day for 5 days (Group A), or injected with prednisone once a day for 5 days (Group B). Whole blood samples were collected by intracordal puncture before intravenous injection in group A and B, 24 hr after injection of horse serum in group A, and 3, 7, and 21 days after prednisone administration. Radioimmunological methods were used to detect the plasma endothelin (ET) and thrombomodulin (TM), and ELISA was used to detect the plasma intercellular adhesion molecule-1 (ICAM-1. Some rabbits were killed before intravenous administration, 24 hrs after injection of horse serum in group A, and 3, 7, 21, 35, and 49 days after the first treatment with prednisone respectively and their bilateral femoral heads were taken out to undergo HE staining and microscopy and SP-VEGF immunohistochemistry.The levels of plasma TM, ET, and ICAM-1 gradually increased in comparison with those before treatment in both group, however, not significantly (all P > 0.05). The levels of plasma TM 1 week and 3 weeks after the initial prednisone administration inn Group A were significantly higher than those in Group B (both P < 0.05). 3 weeks after the initial prednisone administration the levels of plasma ICAM-1 and TM began to decrease and were lower than those 1 week after, however, not significantly (both P > 0.05). Pathological changes could be seen 1 and 3 weeks after in both groups and then recovered by the 7th week after the treatment. The level of VEGF expression in the osteocytes, osteoblasts, and cells of bone matrix and endothelial cells increased first 1 week after and then decreased after the prednisone administration in Group A, and decreased after the prednisone administration in Group B, however, without significant differences between these 2 groups.After prednisone treatment, a pre-necrosis status occurs in femoral head with a potential to restore which can be affected by many factors. Long-term observation on this status is necessary.", "keywords": [ "Cell adhesion molecules", "Endothelial growth factor", "Endothelins", "Femur head necrosis", "Thrombonodulin" ], "authors": [ { "name": "Kun-zheng Wang", "org": ", Department of Orthopedics, Second Hospital of Xian Jiaotong University, Xi'an ,China" }, { "name": "Chun-sheng Wang", "org": ", Department of Orthopedics, Second Hospital of Xian Jiaotong University, Xi'an ,China" }, { "name": "Yong-gang Wu", "org": ", Department of Orthopedics, Second Hospital of Xian Jiaotong University, Xi'an ,China" }, { "name": "Hong Chen", "org": ", Department of Orthopedics, Second Hospital of Xian Jiaotong University, Xi'an ,China" } ], "venue": "Zhonghua yi xue za zhi", "year": 2006 }, "yXbzavt9": { "id": "yXbzavt9", "title": "Prefabrication of vascularized grafts based on pre-differentiated adipose derived stem cells, fibrin sealant and porous calcium phosphate cement scaffold", "abstract": "Background: Construction of vascularized bone substitutes to mimic free vascularized fibular grafting in treating large bone defects still remains challenges to researchers during the past years. Objective: To design and construct a new vascularized tissue-engineered bone graft using pre-differentiated adipose derived stem cells, fibrin sealant and porous calcium phosphate cement scaffold. Methods: Adipose derived stem cells isolated from rats were directly differentiated to endothelial cells and then incorporated in fibrin sealant and porous calcium phosphate cement scaffolds in vitro. Subsequently, the different composites of the three groups including vascularized tissue-engineered bone scaffold (group A), fibrin sealant and porous calcium phosphate cement scaffold (group B) and porous calcium phosphate cement scaffold (group C) were directly embedded into the quadriceps of the rats. Histological quantitative analysis and western blot assay were conducted 2 and 4 weeks after implantation. Results and Conclusion: The pre-differentiated adipose derived stem cells were demonstrated in good condition after 7 days co-culturing with the fibrin sealant and porous calcium phosphate cement scaffold. The results of in vivo experiments showed that the scaffolds were in-grown together with fibrous connective tissues and blood vessels. Newly formed vessels and immature capillaries were observed in the group A. The vessel density, vessel diameter and vascular endothelial growth factor C expression in the group A were significantly higher than those in the groups B and C. Our findings demonstrated that compared with simply fibrin sealant and porous calcium phosphate cement scaffold, the combination of pre-differentiated adipose derived stem cells (endothelial differentiation) and fibrin sealant can achieve rapid angiogenesis of porous calcium phosphate cement scaffold.", "keywords": [ "null" ], "authors": [ { "name": "Pei Yang", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "Xin Huang", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "Wang Chun-sheng", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "Wang Kun-zheng", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" } ], "venue": "Chinese Journal of Tissue Engineering Research", "year": 2013 }, "UvQpFNun": { "id": "UvQpFNun", "title": "Treatment of calcaneal avulsion fractures with twinfix suture anchors fixation]", "abstract": "For the calcaneal avulsion fracture, the current method is more commonly used screws or Kirschner wire to fix fracture fragment. This article intended to explore the feasibility and clinical efficacy for the treatment of avulsion fractures with TwinFix suture anchors.From July 2007 to November 2010, 21 patients were reviewed, including 15 males and 6 females, ranging in age from 49 to 65 years,with a mean of 58.7 years. Twelve patients had nodules in the right heel and 9 patients had nodules in the left heel. All the patients had closed fractures. The typical preoperative symptoms of the patients included pain in the upper heel and weak in heel lift. Body examination results: palpable sense of bone rubbing in the back of the heel, and swelling in the heel. Surgery treatment with TwinFix suture anchors performed as follows : to fix TwinFix suture anchors into the calcaneal body, then to drill the fracture block, to make the double strand suture through the fracture holes, to knot the suture eachother to fix the block, and to use stitch to fix the remaining suture in the Achilles tendon in order to improve the block fixation. The criteria of the AOFAS Foot and Ankle Surgery by the United States Association of ankle-rear foot functional recovery was used to evaluate the Achilles tendon.Total average score was (95.5 +/- 3.12) points, including pain items of(38.5 +/- 2.18) points,the average score of functional items of (49.5 +/- 3.09) points,and power lines of 10 points in all patients. Twenty-one patients got an excellent result, 16 good and 5 poor.The methods of treatment for the calcaneal avulsion fractures with TwinFix suture anchors is a simple operation, and have excellent clinical effect, which is worthy of promotion.", "keywords": [ "calcaneus", "surgical procedures", "operative", "fracture fixation", "fractures" ], "authors": [ { "name": "Bin-xiu Zhao", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" }, { "name": "Kun-zheng Wang", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" }, { "name": "Chun-sheng Wang", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" }, { "name": "Yue Xie", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" }, { "name": "Zhi-tang Dai", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" }, { "name": "Gang Liu", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" }, { "name": "Wei-dong Liu", "org": "*The 9th District of Orthopaedics Department,the First Hospital of Huaian Affiliated to Nanjing University of Medicine,Huaian ,Jiangsu,China" } ], "venue": "Zhongguo gu shang = China journal of orthopaedics and traumatology", "year": 2011 }, "vQUBkxUS": { "id": "vQUBkxUS", "title": "Clinical comparision of the treatment of cervical prolapse of intervertebral disc by using cage or titanium plate", "abstract": "Objective: To compare the clinical effects of treating cervical prolapse of intervertebral disc by using Solis cage, titanium cage and autogenous iliac crest graft (AICG) combined with titanium plate. Methods: 64 cases of cervical prolapse of intervertebral disc were analyzed retrospectively. All the patients were followed up for about one year. Group A is composed of 20 patients (30 intervertebral spaces) treated with microdiscectomy and Solis cage fusion; group B is composed of 21 patients(22 intervertebral spaces) treated with titanium cage and group C is involved of 23 patients(28 intervertebral spaces) which were dealt with AICG combined with titanium plate. The differences in the total X ray exposure time, time working on iliac bone, incidence of complications, fusion rate, incidence of JOA score recovery rate more than 50% and rehabilitation time of the three groups are analyzed. Results: All indexes from group A and B were more satisfactory than those from group C (P<0.05). The statistic analysis results of the incidence of complications of cervical part, rehabilitation time in group A are 5.0±1.8, 5.1±1.2; and that is 14.3±2.6, 7.5±1.6 and 26.1±6.2, 8.6±2.3 in group B and group C respectively. There is significant difference between group A and group B on the incidence of complications of cervical part and rehabilitation time (P<0.05). Results of the incidence of JOA score recovery rate >50% in group A(95.8±3.2) was more satisfactory than that in group B(93.6±2.9), while there was no statistical difference between group A and group B (P>0.05). Conclusion: The Solis cage is better in treating the cervical prolapse of intervertebral disc than other ways. Also, it makes the operation easier, rehabilitation time shorter, and it causes fewer complications.", "keywords": [ "Cage", " titanium plate", "Cervical prolapse of intervertebral disc" ], "authors": [ { "name": "Pei Yang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Fuliang Gong", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Zhibin Shi", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Academic Journal of Xi'an Jiaotong University", "year": 2006 }, "cDDPPx2K": { "id": "cDDPPx2K", "title": "OPG/RANKL protein expresssion in bone marrow stroma cells of glucocorticoid-induced nerrosis of femoral head patients", "abstract": "Objective To investigate the expression levels of osteoprotegerin(OPG) and receptor activator of nuclear factor kappa B ligand(RANKL) protein in marrow stroma cells of patients suffering giucocorticoid-induced necrosis of femoral head(GNFH),and to discuss the relationship between OPG/RANKL system and GNFH.Methods Bone tissues and marrow stroma cells of femoral head were collected in 35 patients with GNFH(experiment group) and 21 patients with femoral neck fracture(control group).The ratio of men to women was 4:3 in the two groups,and the ages of the patients ranged from 41 to 70 years old(average 55.34 years in the experimental group and 55.33 years in the control group).The experimental group had received over three week's glucocorticoid treatment or more than one week's high-dose glucocorticoid therapy in recent two years,but the control group had never received more than one week's hormone therapy.In two groups,microstructure of bone tissue of femoral head was detected by HE stain.Bone marrow stromal cells(BMSCs) were isolated and cultured by adherent-wall method.the protein expression levels of OPG and RANKL were examined by western blot for each example.Results HE stain:bone trabeculae and bone units were replaced by interrupted bone fragments, which were surrounded by inflammation and granulation tissue.Few osteocyte were seen in bone lacunae in experiment group.In control group,bone trabeculae and bone units were made by complete lamellar bone which surrounded blood vessels and osteocytes were seen in lacunae.Western blot testing;the ratio of OPG/RANKL protein expression was 1.13±0.65 and 2.54±0.35 in experimental group and control group.The ratio of in experiment group was significantly lower than control group(P < 0.05 ).Conclusion The glucocorticoid-induced necrosis of femoral head may be related to the expression levels of OPG/RANKL in marrow stroma cells.", "keywords": [ "Femoral head", "Osteonecrosis", "Cytokines", "Glucocorticoid", "Marrow stroma cells" ], "authors": [ { "name": "Wang Jianzhong", "org": "Department of Orthopaedics,2~%%#nd%%# Affiliated Hospital,Inner Mongolia Medical College,Hohhot " }, { "name": "Wang Chunsheng", "org": "Department of Orthopaedics,2~%%#nd%%# Affiliated Hospital,Medical College,Xi'an Jiaotong University,Xi'an " }, { "name": "Wang Kunzheng", "org": "Department of Orthopaedics,2~%%#nd%%# Affiliated Hospital,Medical College,Xi'an Jiaotong University,Xi'an " }, { "name": "Zhou Jinqiu", "org": "Department of Respiratory Medicine,253 hospital of PLA,Hohhot ,China" } ], "venue": "Chinese Journal of Bone and Joint Surgery", "year": 2011 }, "hM5UD7ST": { "id": "hM5UD7ST", "title": "Repair of bone defects using a new biomimetic construction fabricated by adipose-derived stem cells, collagen I, and porous beta-tricalcium phosphate scaffolds.", "abstract": "Adipose derived stem cells (ASCs) with multilineage differentiation capacities have been demonstrated as an alternative cell candidate for in vitro and in vivo bone regeneration. This suggests that they may be a potential candidate to repair the bone defects. We attempted to demonstrate the use of new biomimetic constructions of undifferentiated rabbit adipose-derived stem cells (rASCs) with fully interconnected porous beta-tricalcium phosphate (β-TCP) scaffolds encapsulated by collagen I hydrogel in the regeneration of a critical-sized defect of rabbit radii. Critical-sized defects in the left radii of rabbits were prepared and inserted with rASCs/collagen I/β-TCP scaffold composites or collagen I/β-TCP scaffold composites. The results were evaluated by histology, radiographs, micro-CT, Emission Computed Tomography (ECT), fluorochrome labeling, western blot, and mechanical testing at 4, 8, and 12 weeks postsurgery. Twelve weeks after implantation, the defects were almost completely repaired as confirmed by the presence of the cortical bone and medullary cavity, which was evaluated through radiologic, histologic, and biomechanical examination. Biodegradation of the biomaterials may be attributed to extracellular liquid dissolution together with cell-mediated phagocytosis. Our study shows that a greater number of rASCs in the porous β-TCP scaffold encapsulated by collagen I gel enhanced osteogenesis in critical-sized defects. We hope to garner new insight into the engineering of rASCs-based bone tissue for clinical application.", "keywords": [ "bone graft", "scaffolds", "tissue engineering", "stem cells-adipose" ], "authors": [ { "name": "Pei Yang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xin Huang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xiaoqian Dang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Experimental biology and medicine (Maywood, N.J.)", "year": 2013 }, "1jaTB0Ys": { "id": "1jaTB0Ys", "title": "Measurement and analysis of linear parameters for the proximal tibial section of the northwest Han people of China", "abstract": "BACKGROUND:Knee prostheses for knee replacement in China are mostly imported from the United States and Europe,or produced based on these import prostheses.However,there are many differences in knee interface between Chinese people and European and Americal people,and even among different Chinese populations.It is important for good replacement outcomes to prepare apropriate knee prostheses suitable for different Chinese populations.OBJECTIVE:To define the geometric features of the tibial proximal section of Han population from the northwest China.METHODS:The digitized model of proximal tibia was established through putting the knee CT scan data into the workstation for digital image,in the model make corss sections backward 3° at the levels of 3 mm and 6 mm depth under the tibial plateau medial plate,several diameters of the two cross sections were measured,for example anteroposterior diameter and transverse diameter.RESULTS AND CONCLUSION:The value of the various diameter lines was obtained to get the correlation between the diameter lines with regression equation.The proximal section of the Han people group of northwest Chinese has its characteristics,compared with European and the other people groups in Asia.The knee prosthesis tibial side for Han people group of northwest Chinese should be chosen and designed according to its alone features.", "keywords": [], "authors": [ { "name": "Zhao Bin-xiu", "org": "First Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China;Department of Orthopedics,Huaian First Hospital of Nanjing Medical University,Huaian ,Jiangsu Province,China" }, { "name": "Wang Kun-zheng", "org": "First Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Wang Chun-sheng", "org": "First Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Chen Xiao-liang", "org": "Department of Orthopedics,Affiliated Hospital of Qingdao University Medical School,Qingdao ,Shandong Province,China" } ], "venue": "Journal of Clinical Rehabilitative Tissue Engineering Research", "year": 2011 }, "qLXcKHJf": { "id": "qLXcKHJf", "title": "Activity assay of vascular endothelial growth factor in prokaryocytes", "abstract": "Background: The vascular endothelial growth factor used in clinic is restricted by limited resources and difficulty in preparation. Objective: To culture and isolate the human vascular endothelial growth factor (hVEGF165) by genetic engineering method in escherichia coli, test the biological activity and immunologic competence in order to offer proteinum for the construction of tissue engineered bone. Design, time and setting: The open experiment of single sample observation was performed at the Laboratory of Virus of Shaanxi Provincial Center for Disease Control and Prevention between April 2005 and January 2007. Materials: The cloning vector PUC18-VEGF165 was constructed by Shi Zhi-bin, a doctor from Second Affiliated Hospital of Xi'an Jiaotong University, the plasmid PGEM-T easy was produced by Promerga Company of USA, prokaryotic expression plasmid was purchased from Qiagen Company of Germany, DH5a, M15, JM109 strains were conserved by Shanaxi Provincial Center for Disease Control and Prevention. Methods: The objective gene fragment was subcloned by polymerase chain reaction, and then it was inserted into pQE30 plasmid. IPTG was used in escherichia coli Jm109 and purified by Ni21-NTA to gain hVEGF165 fusion protein. Main outcome measures: Subclone of hVEGF165, identification of recombinant expression vector pQE30-hVEGF165, induced expression of hVEGF165 were observed in the study. Immunologic competence and biological activity were detected by ELISA, Western blot, HET-CAM and matrigel angiogenesis assay, respectively. Results: The recombinant hVEGF165 fusion protein with relative molecular mass 23 000 was successfully expressed in escherichia coli Jm 109 as an inclusion body, and accounted for 30% of total cellular protein. Western blot, ELISA, HET-CAM and matrigel angiogenesis assay showed that purified protein had an excellent immunologic competence and biological activity. Conclusion: The recombinant hVEGF165 with excellent biological activity is successfully expressed in escherichia coli Jm109 and offer sufficient proteinum for the construction of prefabricated tissue engineered bone.", "keywords": [ "null" ], "authors": [ { "name": "Yao Zhen Lei", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Pei Yang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Wang Kun-zheng", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Shi Zhi-bin", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Ni Jian-long", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Yu Peng-bo", "org": "Shaanxi Provincial Center for Disease Control and Prevention(Shaanxi Center for Disease Control and Prevention,Shaanxi Provincial Center for Disease Control and Prevention,Center for Disease Control and Prevention of Shaanxi Province),Xi'an,China" }, { "name": "Dang Xiao-qian", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Wang Chun-sheng", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Gong Fu-liang", "org": "Dalian Medical University(Dalian Medical University),Dalian,China" } ], "venue": "Journal of Clinical Rehabilitative Tissue Engineering Research", "year": 2008 }, "VrEWaDSL": { "id": "VrEWaDSL", "title": "Color Doppler ultrasound combined with ultrasound elasticity imaging for staging diagnosis of deep vein thrombosis after primary total hip replacement", "abstract": "Objective To investigate the diagnostic value of color Doppler ultrasound combined with ultrasound elasticity imaging for deep vein thrombosis in different stages after primary total hip replacement. Methods 32 patients of deep vein thrombosis after primary total hip replacement were divided into acute thrombosis group, sub-acute thrombosis group and chronic thrombosis group. Each thrombus was detected by color Doppler ultrasound and ultrasound elasticity imaging. The characteristics of thrombosis were evaluated by establishing five scores rating and the strain ratio. Results In color Doppler ultrasound, the acute thrombosis was low or equal level echo, the sub-acute thrombosis was equal or hypo-enhancement level echo, and the chronic thrombosis was high level echo. In ultrasound elasticity image, the acute thrombosis was mainly red, the sub-acute thrombosis was mainly green, and the chronic thrombosis was mainly blue. The five scores rating and the strain ratio of sub-acute thrombosis group and chronic thrombosis group were higher than those of acute thrombosis group. The five scores rating and the strain ratio of chronic thrombosis group were higher than those of sub-acute thrombosis group. Conclusions Color Doppler ultrasound combined with ultrasound elasticity imaging can be used to diagnose the deep vein thrombosis in different stages after primary total hip replacement.", "keywords": [ "doppler", "replacement", "Diagnosis", "color", "hip", "Venous thrombosis", "Ultrasonography", "Arthroplasty" ], "authors": [ { "name": "ZHANG Chen", "org": " *Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "LI Miao", "org": " *Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "WANG Kun-zheng", "org": " *Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "DANG Xiao-qian", "org": " *Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "WANG Chun-sheng", "org": " *Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an , China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Edition)", "year": 2012 }, "gFJo9qaR": { "id": "gFJo9qaR", "title": "Morphological changes of proximal femur in patients with Crowe II/III developmental dysplasia of hip and their implication to total hip arthroplasty]", "abstract": "To investigate the morphological changes of the proximal femur and their implication to the total hip arthroplasty in patients with Crowe II/III developmental dysplasia of the hip (DDH).The experimental group was composed of 15 hips in 14 patients (Crowe II, 9 hips; Crowe III, 6 hips ) with osteoarthritis secondary to Crowe II/III DDH (2 males, 12 females; age, 35-61 years). None of the patients had accepted any osteotomy treatment. The control group was composed of 15 normal hips in 15 patients with unilateral DDH (3 males, 12 females; age, 35-57 years). Twelve hips came from the experimental group and the other 3 came from the patients with unilateral Crowe I DDH. The femurs were examined with the CT scanning. The following parameters were measured: the height of the center of the femoral head (HCFH), the isthmus position (IP), the neck-shaft angle(NS), the anteversion angle, the canal flare index, and the canal width. Then, the analysis of the data was conducted.HCFH and IP in the experimental group and the control group were 50.1 +/- 6.7 mm, 50.1 +/- 7.4 mm, and 107.4 +/- 21.5 mm, 108.7 +/- 18.1 mm, respectively, which had no significant difference between the two groups (P > 0.05). In the experimental group and the control group, the NS were 138.3 +/- 10.0 degrees and 126.7 +/- 5.7 degrees, the anteversion angles were 36.5 +/- 15.9 degrees and 18.8 +/- 5.4 degrees, and the canal flare indexes were 4.47 +/- 0.40 and 5.01 +/- 0.43. There was a significant difference between the two groups in the above 3 parameters (P < 0.05). As for the canal width of the femur, there was a significant difference in the interior/exterior widths and the anterior/posterior widths at the level of 2 cm above the lesser trochanter and 4 cm below the lesser trochanter between the two groups (P < 0.05); however, there was no significant difference in the canal width of the femur at the isthmus between the two groups (P > 0.05).It is necessary to evaluate the morphology of the proximal femur before the total hip arthroplasty performed in patients with Crowe II /III DDH. The straight and smaller femoral prosthesis should be chosen and implanted in the proper anteversion position during operation.", "keywords": [ "Developmental dysplasia of the hip Proximal femur Morphology Total hip arthroplasty" ], "authors": [ { "name": "Ruiyu Liu", "org": "Department of Orthopedics, Second Hospital Affiliated to Medical College of Xi'an Jiaotong University, Xi'an Shaanxi 710004, PR China. liuryu@126.com" }, { "name": "Chunsheng Wang", "org": ", et al. Department of Orthopedics, Second Hospital Affilicated to Medical College of Xi'an Jiaotong University, Xi'an Shaanxi, , P. R. China." }, { "name": "Kunzheng Wang", "org": ", et al. Department of Orthopedics, Second Hospital Affilicated to Medical College of Xi'an Jiaotong University, Xi'an Shaanxi, , P. R. China." } ], "venue": "Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery", "year": 2007 }, "sXotGQHZ": { "id": "sXotGQHZ", "title": "Selection of femoral prosthesis in total hip replacement for ankylosing spondylitis.", "abstract": "To investigate the implication of morphological changes of the proximal femur in femoral prosthesis selection in total hip replacement for treatment of ankylosing spondylitis (AS).Twenty-four patients (36 hips) admitted for cementless total hip replacement (THR) because of AS were enrolled in this study along with the control group of 30 patients (45 hips) without AS. Measurement of the Singh index, canal flare index, morphological index of the cortex, cortical index and stem-canal fit was performed in the two groups on the basis of roentgenograms.The AS patients had more serious osteoporosis in their proximal femur. There were significant differences between the two groups in Singh index, canal flare index, morphological index of the cortex and stem-canal fit (P<0.05), but not in the cortical index (P>0.05). The AS patients were found to have severe osteoporosis in the upper femur and massive spongy bone loss, so that the morphology of the canal was almost orthostatic in the upper femur because of the thinned femoral cortex.Cemented prosthesis is recommended for AS patients with severe osteoporosis, who should be treated with revised THR to ensure good fit of the prosthesis to the canal. Cementless prosthesis, however, can still achieve good therapeutic effect in AS patients without significant morphologic changes in the proximal femurs. Computer-aided design and manufacture of individualized prosthesis better suits the AS patients than the currently available prosthesis.", "keywords": [ "flare canal index", "proximal femur", "cortical index", "singh index", "ankylosing spondylitis" ], "authors": [ { "name": "Pei Yang", "org": "Department of Orthopedics, Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "Chun-sheng Wang", "org": "Department of Orthopedics, Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "Kun-zheng Wang", "org": "Department of Orthopedics, Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "Zhi-Bin Shi", "org": "Department of Orthopedics, Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "Fu-liang Gong", "org": "Department of Orthopedics, Second Hospital of Xi'an Jiaotong University, Xi'an , China" } ], "venue": "Di 1 jun yi da xue xue bao = Academic journal of the first medical college of PLA", "year": 2005 }, "50q35jmN": { "id": "50q35jmN", "title": "Application of spiral CT in the evaluation of acetabular anatomy with developmental dysplasia of the hip before total hip artroplasty", "abstract": "Objective To explore the method and application value of three-dimensional reconstructive technique of spiral CT in the evaluation of acetabulum anatomy with developmental dysplasia of the hip before total hip artroplasty. Methods 13 cases with developmental dysplasia of the hips were examined with spiral CT, surface shaded display(SSD) and multiplanar reconstruction(MPR) to observe the spacial location of acetabula and sclerotin of the acetabular wall,so as to analyze their morphological changes. Results All acetabula become smaller and shallow. Superior-lateral walls of acebabula have various extent bony deficiency,but medial and posterior walls of acebabula have some-quantity bone-stock. Osteophytes in some acetabula accrementition seriously and make acetabula more shallow and osteophytes in the anterior rim of acetabula make it less anteversion. Conclusion SSD and MPR of spiral CT are effective methods in evaluating the acetabulum morphology,and have strong implication to prosthesis selection pre-operation and acetabulum reconstruction in-operation.", "keywords": [ "Hip joint", "CT", "Morphogenesis", "Developmental disabilities" ], "authors": [ { "name": "LIU Rui-yu", "org": ". Department of Orthopedics ,Second Hospital Affilicated to Medical College of Xi' an Jiaotong University, Xi' an , China" }, { "name": "WANG Chun-sheng", "org": ". Department of Orthopedics ,Second Hospital Affilicated to Medical College of Xi' an Jiaotong University, Xi' an , China" }, { "name": "WANG Kun-zheng", "org": ". Department of Orthopedics ,Second Hospital Affilicated to Medical College of Xi' an Jiaotong University, Xi' an , China" }, { "name": "TONG Zhi-qin", "org": ". Department of Orthopedics ,Second Hospital Affilicated to Medical College of Xi' an Jiaotong University, Xi' an , China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Version)", "year": 2007 }, "KDPCWzNC": { "id": "KDPCWzNC", "title": "Cemented versus uncemented bipolar hemiarthroplasty for femoral neck fractures in the elderly", "abstract": "BACKGROUND: Many studies have been conducted about cemented and uncemented total hip arthroplasty (THA). However, there are few reports about the differences between cemented and uncemented bipolar hemiarthroplasty in China. OBJECTIVE: To compare treatment effects of cemented and uncemented bipolar prostheses on fracture of femoral neck in the elderly. DESIGN, TIME AND SETTING: Comparative observation. The patients were selected from Department of Orthopaedics, Xi’an Red Cross Hospital from January 2004 to December 2005. PARTICIPANTS: 131 cases of femoral neck fractures (type Garden Ⅲ and Ⅳ) were selected from Department of Orthopaedics Xi’an Red Cross Hospital, including 39 males and 92 females, aged 79 years (ranging 65-98 years); 72 cases of left hip and 59 cases of right hip. METHODS: The patients with various basic diseases were given corresponding treatment before surgery. The operation was performed 3 or 4 days after admission by the same operator. The patients were randomly divided into two groups, who were separately treated with cemented or uncemented prostheses. The patients were followed up for 3 years after operation and the hip function was evaluated by Harris score. MAIN OUTCOME MEASURES: Hip function, Harris score, mortality revision rate, revision rate and complication incidence rate. RESULTS: During follow-up period, 6 in cemented group and 8 in uncemented group died. After 3 month of operation, 43 patients could walk independently, 15 needed walking aid, and 5 only acted on bed in cemented group. In uncemented group, 27 patients could walk independently, and 35 needed walking aid. In hospital, 9 patients of cemented group and 15 of uncemented group had complication. After 3 years of operation, 14 cases underwent revision in cemented group due to prosthesis loosening with revision rate of 23.73%, while only 5 patients underwent revision in uncemented group, including 4 cases of prosthesis loosening and 1 of femur split with a revision rate of 23.73%. One year after operation, there was no statistically significance in Harris scores between two groups. During follow-up period, there was no difference in acetabular abrasion between two groups, but the uncemented group had a higher medullary cavity possession rate. No prosthesis dislocation, heterotopic ossification, or bone dissolving was found. CONCLUSION: There were no differences in hip function between cemented and uncemented bipolar hemiarthroplasty for femoral neck fractures in the elderly during follow up.", "keywords": [ "null" ], "authors": [ { "name": "Meng Hai-liang", "org": " First Department of Orthopedics, Second Hospital of Xi’an Jiaotong University, Xi’an , Shaanxi Province, China" }, { "name": "Wang Kun-zheng", "org": " First Department of Orthopedics, Second Hospital of Xi’an Jiaotong University, Xi’an , Shaanxi Province, China" }, { "name": "Wang Chun-sheng", "org": " First Department of Orthopedics, Second Hospital of Xi’an Jiaotong University, Xi’an , Shaanxi Province, China" }, { "name": "Feng Min", "org": " First Department of Orthopedics, Second Hospital of Xi’an Jiaotong University, Xi’an , Shaanxi Province, China" } ], "venue": "Journal of Clinical Rehabilitative Tissue Engineering Research", "year": 2009 }, "x1sFyZjI": { "id": "x1sFyZjI", "title": "Prefabrication of vascularized porous three-dimensional scaffold induced from rhVEGF165: A preliminary study in rats", "abstract": "Background/Aims: Several shortcomings have limited the routine use of autogenous vascularized bone graft. The present study investigates the prefabrication of vascularized scaffold with the desired shape and microarchitecture combined with recombinant human vascular endothelial growth factor 165 (rhVEGF165) to mimic autogenous vascularized bone graft. Methods: Eighty-five porous calcium phosphate cement scaffolds constructed by rapid prototyping technology were divided into four groups: group A [rhVEGF 165-fibrin sealant (FS) scaffold], group B (hVEGF165 scaffold), group C (FS scaffold), and group D (scaffold alone). The release of rhVEGF165 from the scaffolds was examined in vitro. The vessel density, relative functionalized vessels, vessel diameter and relative vessel area were also measured. Results: The sustained release of hVEGF165 lasted 14 days in the absence of plasmin and 12 days in the presence of plasmin in group A and 10 days in group B. There was no statistical difference between groups A and B at 2 or 4 weeks in terms of vessel density, relative functionalized vessels, vessel diameter, and relative vessel area, as between groups C and D. However, the above parameters were greater in groups A and B than groups C and D. Conclusion: The scaffolds with the desired shape and microarchitecture combined with rhVEGF165 could shorten the time needed for the construction of prefabricated vascularized grafts and accelerate the maturation of the vessels. Copyright © 2008 S. Karger AG, Basel.", "keywords": [ "angiogenesis", "scaffolds", "prefabrication", "tissue engineering", "vascular endothelial growth factor", "sustained release", "three dimensional" ], "authors": [ { "name": "Pei Yang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Zhibin Shi", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xin Huang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xiaoqian Dang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Shanglong Xu", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Cells Tissues Organs", "year": 2009 }, "hMcsVrPt": { "id": "hMcsVrPt", "title": "Relationship between decubitus and changes of serum albumin levels of paraplegia patients induced by spinal cord injury", "abstract": "Aim: To understand the relationship of the occurrence of decubitus with serum albumin level in paraplegia patients induced by spinal cord injury. Methods: By a prospective research, 54 paraplegia patients induced by spinal cord injury were followed up to observe the changes of serum albumin level. Results: The serum albumin level were markedly correlated with occurring, scoring and healing of decubitus. Conclusion: The serum albumin values are obviously correlated which decubitus in paraplegia patients, between with there is a vicious cycle, so in the treatment of paraplegia, the malnutrition and decubitus should be actively used simultaneously.", "keywords": [ "null" ], "authors": [ { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Zhibin Shi", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "An Qing Liu", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xiaoqian Dang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Chinese Journal of Clinical Rehabilitation", "year": 2004 }, "0bh4k9V0": { "id": "0bh4k9V0", "title": "Relevant factors for knee osteoarthritis in middle aged and old population", "abstract": "AIM:To explore the prevalence and pathogenetic features of knee osteoarthritis among the middle-aged and elderly people in the urban and rural of Xi'an,so as to provide some available evidence for precaution and treatment of osteoarthritis of the knee.METHODS:From May to October 2005,those aged above 40 years,had been living in Xi'an for a long time were investigated except someone had been gone out for more than 1 year.1 450 people from 8 communities and 5 counties were involved according to multiple stage cluster sampling.The unified questionnaire,including general state of health,present history,past history,physical examination etc,was carried out and all subjects were given both knees normotopia and lateral position radiographic examination.Excluded other etiological factors,some of them were finally diagnosed as idiopathic osteoarthritis of knee if they had clinical symptoms and a radiographic grade above Kellgren & Lawrence Ⅱ grade.RESULTS:Among the 1 450 persons involved in the result analysis,there were 704 men and 746 women.176 persons including 100 urban and 76 rural ones were diagnosed as idiopathic osteoarthritis of knee.①The total prevalence of idiopathic osteoarthritis of knee was 12.1%,radiographic osteophyte of knee was 19.2%,friction sound of knee was 18.3%,right and left keens were 2.5% and 2.1% respectively.②The prevalence of knee osteoarthritis of women was 2.5 times of that of the men(17.2%,6.8%,P =0.000);the prevalence of radiographic osteophyte of women was 2.3 times of that of the men(26.5%,11.4%,P=0.000);There was no significant difference in the prevalence of symptomatic knee between women and men(54.7%,47.4%).③The prevalence of knee osteoarthritis and osteophyte increased with the augment of age,so was the symptomatic knee,except the stages of 56-60 years and 66-70 years.④The prevalence of knee osteoarthritis of urban was higher slightly than that of rural patients,which had no significant difference(12.9%,11.2%).However,the prevalence of symptomatic knee of urban was higher significantly than that of rural.(56.3%,45.3%,P=0.003).There was no significant difference in the formation of osteophyte between urban and rural patients(21.4%,16.6%).⑤There was no obvious difference in the prevalence of osteoarthritis and osteophyte among different work(manual workers:11.6%,18.4%;non-manual workers:14.4%,22.3%).The prevalence of symptomatic knee of non-manual workers was significantly higher than that of manual workers(non-manual workers:62.6%,manual workers:48.5%,P=0.003).⑥In women,with increasing of the body mass index,the prevalence of osteoarthritis of knee was significantly increased.But this change was not been observed in men.⑦The symptom of knee was closely related to the size of osteophyte formed in patellofemoral joint and lateral shin joint.⑧The earlier the menopause,the easier the osteoarthritis appeared,and the worse the osteophyte.Squatting position to defecate could easily cause osteoarthritis,and osteophyte in knee.The prevalence of osteoarthritis,and osteophyte for drinkers was higher than no drinking people.⑨The risk factors for osteoarthritis included female and overweight,and bean and meat could prevent the osteoarthritis.CONCLUSION:Old age,female and obesity serve as risk factors for the osteoarthritis of knee.", "keywords": [ "null" ], "authors": [ { "name": "Wang Wei", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Wang Kun-zheng", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Dang Xiao-qian", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Bai Chuan-yi", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Li Ning-hua", "org": "Department of Epidemiology of Beijing Hospital,Ministry of Health,Beijing ,China" }, { "name": "Wang Chun-sheng", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Shi Zhi-bin", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" }, { "name": "Ma Shu-qiang", "org": "Department of Orthopedics,Second Hospital of Xi'an Jiaotong University,Xi'an ,Shaanxi Province,China" } ], "venue": "Chinese Journal of Clinical Rehabilitation", "year": 2006 }, "obrUjDnR": { "id": "obrUjDnR", "title": "Establishment of Tibial Side Digital Model of Total Knee Replacement", "abstract": "Objective To establish digital tibial model contained tibial side prosthesis for mechanical analysis.Methods normal adult tibia CT scan data input into the image workstation and processed by software Mimics10.0 and ANSYS11.0 to built a tibial digital model,using Pro/E software to build 6 tibial prosthesis digital model of different handle shape and the digital model of polyethylene pads and of bone cement,all the models mentioned above be assembled.Results a postoperative tibial side digital model of TKR be obtained.Conclusion The model is more realistically to simulate the actual tibial side situation postoperative total knee replacement,it is a good foundation for further mechanical analysis.", "keywords": [ "total knee replacement", "model", "prosthesis", "tibia" ], "authors": [ { "name": "ZHAO Bin-xiu", "org": "Department of Orthopadics,Huaian First Hospital Nanjing Medical University,Nanjing ,China;Department of Orthopadics,the Second Hospital of Xi′an Jiaotong University,Xi′an ,China" }, { "name": "WANG Kun-zheng", "org": "Department of Orthopadics,the Second Hospital of Xi′an Jiaotong University,Xi′an ,China" }, { "name": "WANG Chun-sheng", "org": "Department of Orthopadics,the Second Hospital of Xi′an Jiaotong University,Xi′an ,China" } ], "venue": "Journal of Practical Orthopaedics", "year": 2011 }, "TeyzoESO": { "id": "TeyzoESO", "title": "Effect of olfactory ensheathing cells transplantation on protecting spinal cord and neurons after peripheral nerve injury]", "abstract": "To study the effect of olfactory ensheathing cells (OECs) transplantation on protecting spinal cord and neurons after peripheral nerve injury.Fifty-five SD rats were randomly divided into blank group (n = 5), experimental group (n = 25) and control group (n = 25). The right sciatic nerves of all the rats were transected. The proximal end was embedded in muscle and treated with OECs (experimental group) and DMEM (control group). No treatment was given to the blank group. The rats were sacrificed 1, 2, 3, 7, and 14 days after the transplantation, the related neurons were observed with histological and TUNEL methods.After sciatic nerves were transected, death of neurons occurred in spinal cord and ganglion. One, 2, 3 days after treatment, the neuron survival rate in experimental group was 98.4% +/- 6.5%, 97.6% +/- 6.5%, 95.2% +/- 6.7% respectively. The neuron survival rate in control group was 97.8% +/- 6.7%, 97.4% +/- 6.4%, 94.3% +/- 6.8% 1, 2, and 3 days after treatment respectively. There was no significant difference between experimental group and control group. Seven and 14 days after treatment, the neuron survival rate in experimental group was 92.4% +/- 8.9%, 87.7% +/- 9.4% respectively. The neuron survival rate in control group was 87.4% +/- 8.6%, 83.4% +/- 8.5% 7 and 14 days after treatment respectively. There was significant difference between experimental group and control group. On 1st and 2nd day, no apoptosis was seen in spinal cord anterior horn of the rats in both experimental group and control group. On 3rd, 7th, and 14th day, the apoptosis index of spinal cord anterior horn motoneuron in experimental rats were lower (1.2+/-0.8, 1.4 +/- 0. 6, 4.1 +/- 1. 3) than that in the control group (2.1 +/- 1.1, 3.1 +/- 1.1, 6.1 +/- 1.8) (P < 0.05). One, 2, and 3 days after the operation, no ganglion neurons apoptosis was observed in all rats. On 7th day the apoptosis index of ganglion neurons in experimental group(2.10 +/- 0.32) were lower than that in control group (4.40+/-0.56) (P<0.05). On 14th day there was no significant difference in the apoptosis index of ganglion neurons between experimental group (4.30+/-1.80) and control group (6.70 +/- 2.50) (P<0.05).Apoptosis of neurons occur after peripheral nerve injury in spinal cord and ganglion. OECs transplantation is effective in preventing apoptosis.", "keywords": [ "peripheral nerve injury olfactory ensheathing cell neuron apoptosis rat" ], "authors": [ { "name": "Chunsheng Wang", "org": "Department of Orthopedics, the Second Hospital of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P. R. China. wcs420@163.com" }, { "name": "Zhibin Shi", "org": "" }, { "name": "Kunzheng Wang", "org": "" } ], "venue": "Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery", "year": 2005 }, "64e4ui2U": { "id": "64e4ui2U", "title": "Impact of adipose-derived stem cells combined with vascular bundle implantation on vascularized tissue engineering scaffolds in vivo]", "abstract": "To discuss the impact of adipose-derived stem cells (ADSCs) combined with vascular bundle implantation on vascularized tissue engineering scaffolds in vivo so as to provide a theoretical basis for the repair of avascular necrosis of the femoral head.ADSCs were isolated from 4-month-old Sprague Dawley (SD) rats and cultured, then were induced to osteogenesis and identified. ADSCs at the 3rd passage were seeded on the nano-hydroxyapatite/polyamide-66 (nHA/PA66) to prepare the composite scaffolds. The compound condition of cells and scaffold materials were observed under scanning electronic microscope (SEM). Twenty-four 4-month-old SD rats (weighing 350-400 g) were randomly divided into 3 groups (n=8). In group A and group B, the inferior epigastric artery and vein of rats were implanted into composite scaffold cultured for 10 days or simple nHA/PA66 scaffold, respectively. In group C, two composite scaffolds cultured for 10 days were embedded into quadriceps femoris muscle of both thighs, respectively. After 2 and 4 weeks of operation, angiogenesis was observed by HE staining and CD34 immunohistochemical staining.Cells isolated from adipose were identified as ADSCs. SEM showed that the number of cells increased after being cultured for 10 days, cell morphology stretched fully with a shape of long spindle. HE staining and immunohistochemical staining showed that a large number of angiogenesis was observed around the implanted artery and vein in group A, which was superior to groups B and C in the number of blood vessels and the maturity of blood vessel wall. After 2 and 4 weeks of operation, the blood vessel density and blood vessel diameter were significantly higher in group A than in group B and group C, and in group B than in group C (P < 0.05).Combined application of ADSCs and vascular bundle implantation can promote the degree of vascularization, which could make the scaffold vascularization reliable.", "keywords": [ "tissue engineering scaffold adipose-derived stem cells vascular bundle implantation vascularization rat" ], "authors": [ { "name": "Wenchen Ji", "org": "1 No.1 Department of Orthopedics,the Second Affiliated Hospital of Medical School,Xi'an Jiaotong University,Xi'an Shaanxi,,P.R.China" }, { "name": "Pei Yang", "org": "1 No.1 Department of Orthopedics,the Second Affiliated Hospital of Medical School,Xi'an Jiaotong University,Xi'an Shaanxi,,P.R.China" }, { "name": "Yuelin Zhang", "org": " Department of Neurosurgery,Shaanxi Provincial People's Hospital,the Third Affiliated Hospital of Medical College,Xi'an Jiaotong University." }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Jianlong Ni", "org": "1 No.1 Department of Orthopedics,the Second Affiliated Hospital of Medical School,Xi'an Jiaotong University,Xi'an Shaanxi,,P.R.China" }, { "name": "Yongtao Zhang", "org": "1 No.1 Department of Orthopedics,the Second Affiliated Hospital of Medical School,Xi'an Jiaotong University,Xi'an Shaanxi,,P.R.China" }, { "name": "Kunzheng Wang", "org": "1 No.1 Department of Orthopedics,the Second Affiliated Hospital of Medical School,Xi'an Jiaotong University,Xi'an Shaanxi,,P.R.China" } ], "venue": "Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery", "year": 2012 }, "7jkK5PrF": { "id": "7jkK5PrF", "title": "Comparison of curative effect among the therapy of dynamic hip screws,proximal femoral nail and artificial femoral head replacement to treat unstable intertrochanteric fracture in elderly patient", "abstract": "Objective To retrospectively analyze the therapeutic effects of dynamic hip screws (DHS), proximal femoral nail (PFN) and artificial femoral head replacement to treat elderly patients with unstable intertrochanteric fracture.Methods 96 elderly patients with unstable intertrochanteric fractures were divided to three groups. Among them, 34 cases were fixed with dynamic hip screws (DHS group), 36 cases were fixed with proximal femoral nail (PFN group), and 26 cases were treated with artificial femoral head replacement. We compared the effect parameters of the three groups during and after operation.Results All patients were followed up for 10～38 months, mean 18 months. The statistical analysis results showed that there were statistical difference among three groups in the volume of blood loss, operation time, postoperative drainage volume and postoperative activity out of bed days. Compared with the other groups, postoperative complications incidence rate was the highest in the DHS group. It was the lowest in artificial femoral head replacement group among them. According to Harris evaluation standard, the excellent and good rate of DHS group was 79.4%, of PFN group was 94.2%, and of artificial femoral head replacement group was 92.3%. So, the excellent and good rate of PFN group and artificial femoral head replacement group were all significantly higher than that of DHS group (P<0.05).ConclusionsThe therapeutic effects of PFN and artificial femoral head replacement for the treatment of elderly patients with unstable intertrochanteric fracture were better than that of DHS. While, artificial femoral head replacement, especially suitable for the aged patients with osteoporosis, has advantages of earlier postoperative activity out of bed and fewer postoperative complications, which can improve life quality.", "keywords": [ "replacement", "Femoral neck fractures", "hip", "Arthroplasty" ], "authors": [ { "name": "QIANG Hui", "org": ". Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "WANG Kun-zheng", "org": ". Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "ZHANG Chen", "org": ". Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "DANG Xiao-qian", "org": ". Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "WANG Chun-sheng", "org": ". Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "SHI Zhi-bin", "org": ". Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Version)", "year": 2009 }, "hcb0EW7z": { "id": "hcb0EW7z", "title": "[Comparison of early rehabilitation effects of total hip arthroplasty with direct anterior approach versus posterior approach].", "abstract": "DAA is meaningful to enhanced recovery after THA. But it should be chosen carefully because of the disadvantages, such as long learning curve, limited indications, and requirements of specific instruments.", "keywords": [ "Total hip arthroplasty", "direct anterior approach", "early rehabilitation", "posterior approach" ], "authors": [ { "name": "Ziqi Zhang", "org": "Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P.R.China." }, { "name": "Chunsheng Wang", "org": "Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P.R.China." }, { "name": "Pei Yang", "org": "Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P.R.China." }, { "name": "Xiaoqian Dang", "org": "Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P.R.China." }, { "name": "Kunzheng Wang", "org": "Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Shaanxi, 710004, P.R.China.xjtuwkz@163.com." } ], "venue": "Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery", "year": 2018 }, "hvrQjE7F": { "id": "hvrQjE7F", "title": "The application of extended trochanteric osteotomy combining with shape memory alloy fixator in hip joint revision", "abstract": "Objective To study the application and clinical result of extended trochanteric osteotomy combining with shape memory alloy fixator in hip joint revision.Methods Extended trochanteric osteotomy combining with shape memory alloy Embracing Fixator or loop Fixator was used in 35 cases of revision THA from January 2004 to march 2010.An average of(36.8±13.2) months follow-up was carried out.The operation time,intraoperative bleeding volume,osteotomed length,oeteotomed union time and Harris score were analyzed.Results The average operation time was(95.4±23.6) minutes,the average intraoperative bleeding volume was(852.5±228.3) ml,and the average osteotomed length was(13.5±3.5) cm.The osteotomy was fixed by two to three pieces of Memory Alloy loops or one piece of Embracing Fixator.The average oeteotomed union time was(4.8±1.2) months.The average Harris Hip Score was increased from(39.5±13.6) points pre-operation to(82.2±17.8) points post-operation.ConclusionsExtended trochanteric osteotomy combining with shape memory alloy fixator has the advantages of easy removal of well fixed femoral implants,stable fixation,excellent osteotomy healing,and providing a good method for femoral revisions in total hip arthroplasty.", "keywords": [ "Osteotomy", "Internal fixators", "Alloy", "Reoperation" ], "authors": [ { "name": "FAN Li-hong", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "WANG Kun-zheng", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "DANG Xiao-qian", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "WANG Chun-sheng", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "SHI Zhi-bin", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "ZHANG Chen", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Edition)", "year": 2011 }, "T5iJZRcn": { "id": "T5iJZRcn", "title": "rhVEGF 165 delivered in a porous beta-tricalcium phosphate scaffold accelerates bridging of critical-sized defects in rabbit radii.", "abstract": "Segmental bone defects are a common obstacle in major orthopedic procedures, and the treatment of these defects remains a challenging clinical problem. Bone tissue engineering has been attracting much attention in recent years. We evaluated the ability of the specific combination of 3 microg rhVEGF(165) with a novel porous beta-tricalcium phosphate (beta-TCP) scaffold coated with fibrin sealant (FS) to facilitate bone regeneration. Unilateral 15-mm long critical-sized defects were prepared in the radial diaphysis of rabbits and treated with rhVEGF(165)/FS/scaffold or FS/scaffold. Healing of the defects was assessed at 4, 8, and 12 weeks, radiologically, histologically, and biomechanically. The results of the study demonstrated that the critical-sized defects in the midshaft of the rabbit radius, treated with rhVEGF(165) incorporated in porous beta-TCP scaffold by FS, can be completely bridged by cortical bone in 12 weeks. The bone marrow space was also reformed histologically and radiologically at 12 weeks postsurgery in the rhVEGF(165)-treated group. Furthermore, biomechanical examination demonstrated that the segmental bone defects were not only radiologically and histologically repaired but were also mechanically repaired. Interestingly, none of the defects was completely repaired at 12 weeks following treatment with FS/scaffold without rhVEGF(165). A solution-driven process is likely the predominant mechanism of accelerating biodegradation of the beta-TCP scaffold in the presence of rhVEGF(165); furthermore, cell-mediated phagocytosis also contributes to biodegradation of the biomaterials.", "keywords": [], "authors": [ { "name": "Pei Yang", "org": "Department of Orthopaedics, Second Affiliated Hospital of Medical College of Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China." }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Zhibin Shi", "org": "" }, { "name": "Xin Huang", "org": "" }, { "name": "Xiaoqian Dang", "org": "" }, { "name": "Xudong Li", "org": "" }, { "name": "Shien-Fong Lin", "org": "" }, { "name": "Kunzheng Wang", "org": "" } ], "venue": "Journal of biomedical materials research. Part A", "year": 2010 }, "QQvUWbAs": { "id": "QQvUWbAs", "title": "Observation of femoral head grafted with concellous bone", "abstract": "Objective: To observe the femoral head grafted with cancellous bone, so as to provide a theory basis for the treatment of osteonecrosis of femoral head. Methods: 80 Japanese white rabbits were divided into experiment group (femoral head grafted with cancellous bone after dug out) and control group (femoral neck fracture fixed with K-wire) randomly, and then they were observed with X-ray, pathological and angiographies. Results: The femoral head could be reconstructed with cancelloues bone grafting and get a better result than the control group. Conclusion: The medullary cavity vessel could repair the femoral head, so a good environment is very important, and the vessel grafting maybe just accelerate the process.", "keywords": [ "Cancellous bone", "Graft", "Osteonecrosis of femoral head" ], "authors": [ { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xiaoqian Dang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Journal of Xi'an Medical University, Chinese Edition", "year": 2002 }, "06MUPDUO": { "id": "06MUPDUO", "title": "Long-term effects of vascularized fibular graft transplantation for avascular necrosis of femoral head", "abstract": "Objective To evaluate the long-term efficacy of vascularized fibular graft transplantation for avascular necrosis of the femoral head in FicatⅡ-Ⅲ. Methods From June 1985 to June 2005, 361 cases(385 hips) of femoral head necrosis were treated by vascularized fibular graft-based method,of which the effective follow-up were 257 cases (281 hips). There were 144 male and 113 female patients, aged from 23 to 56 years, (39.2±15.3) years in average. According to Ficat staging of femoral head necrosis: 187 hips were in stageⅡand 94 hips were in stage Ⅲ. The follow-up assessments mainly included harris scores of pain, clinical function of hip joint and radiographic evaluation (X-ray film). Results The follow-up rate was 71.19%; the follow-up time was five to 20 years, (10.7±4.4) years in average.The results of pain assessments showed: in stage Ⅱ group, the excellent rates of preoperative evaluation and last postoperative follow-up were 13.4% and 86.6% respectively with pain scores of (15.16±3.41) and (32.99±6.50) respectively; in stage Ⅲ group, the excellent rates of preoperation period and last postoperative follow-up were 3.19% and 54.3%, with pain scores of (8.47±2.15) and (30.70±4.25) respectively. The differences of pain assessments between the preoperation period and last postoperative follow-up were statistically significant (t=8.472, 13.625; P<0.001).The results of clinical hip function assessments showed the excellent rates of preoperation period and last postoperative follow-up in stageⅡ group, were 15.5% and 72.2%, with integrated scores of (53.08±9.91) and (88.46±10.02) respectively; in stage Ⅲ group, the excellent rates of preoperation period and last postoperative follow-up were 4.92% and 34.4%, with integrated scores of (40.32±8.37) and (82.78±12.16) respectively.The difference of clinical hip function assessments between the preoperation period and last postoperative follow-up was statistically significant (t=6.937, 8.720; P<0001). The results of X-ray films assessments showed that in stageⅡ group, the improved rates of preoperation period and last postoperative follow-up were 16.6% and 70.6%, with scores of (23.45±2.89) and (34.50±3.92) respectively; in stage Ⅲ group, the improved rates of preoperation period and last postoperative follow-up were 7.45% and 43.6%, with scores of (15.77±3.06) and (30.22±6.84) respectively. The X-ray results between preoperation period and last postoperative follow-up were statistically significant different (t=4.192, 9.450; P< 0.001). These differences of all results indicated that the clinical hip function improved significantly compared to that before operation. ConclusionsThe treatment of the femoral head necrosis using vascularized fibular graft in FicatⅡ-Ⅲ stage may be an effective method to prevent or delay this diseases progress.", "keywords": [ "Transplantation", "Treatment outcome", "Femur head necrosis", "Fibula" ], "authors": [ { "name": "TIAN Lei", "org": ". Department of Orthopedics, The Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "WANG Kun-zheng", "org": ". Department of Orthopedics, The Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "DANG Xiao-qian", "org": ". Department of Orthopedics, The Second Hospital of Xi'an Jiaotong University, Xi'an , China" }, { "name": "WANG Chun-sheng", "org": ". Department of Orthopedics, The Second Hospital of Xi'an Jiaotong University, Xi'an , China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Edition)", "year": 2012 }, "FReU38XV": { "id": "FReU38XV", "title": "Animal experiment study on vascular pathological change of steroid-induced osteonecrosis of femoral head", "abstract": "Objective Observe the vascular pathological change of animal with steroid-induced osteonecrosis of femoral head,including vessel function,vessel injury,blood viscosity and vessel regeneration.Methods 40 chinese white rabbits were randomly divided into two groups.Animal in group A were treated with horse serum and prednisone group;animal in group B were treated with prednisone.Endothelins(ET),Thrombomodulin(TM) and Intercelluar adhesion molecule-1(ICAM-1) were examined respectively before administration in two groups,24 hours after injection of horse serum in group A and 3,7,21 days after prednisone administration in two groups.The expression and alternation of VEGF in the femoral head were investigated before administration in group A and B,24 hours after injection of horse serum in group A and 3,7,21,35,49 days after first treatment with prednisone.Results The vessel relational factors changes have followed characteristics:First,group A had more obviously changes than group B;Second,3 weeks after prednisone administration,ICAM-1 and TM had begun restore,but ET hadn't.Third,VEGF in two groups behaved as decreases and then restore.Conclusion After prednisone treatment,femoral head got into a pre-necrosis status,some restore could take place in these statuses,so that these statuses should be followed for a long time.", "keywords": [ "cytoadhesin", "Endothelial growth factors", "Receptors", "ThrombonodμLin", "Femur head necrosis", "Endothelins" ], "authors": [ { "name": "WANG Chun-sheng", "org": ".Department of Orthopedics,Second Affiliated Hospital of Medical College of Xian Jiaotong University,Xian ,China" }, { "name": "WANG Kun-zheng", "org": ".Department of Orthopedics,Second Affiliated Hospital of Medical College of Xian Jiaotong University,Xian ,China" }, { "name": "WU Yong-gang", "org": ".Department of Orthopedics,Second Affiliated Hospital of Medical College of Xian Jiaotong University,Xian ,China" }, { "name": "YANG Pei", "org": ".Department of Orthopedics,Second Affiliated Hospital of Medical College of Xian Jiaotong University,Xian ,China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Version)", "year": 2008 }, "KWtsru1M": { "id": "KWtsru1M", "title": "Primary total knee arthroplasty for complex supracondylar femoral fractures in patients with knee arthritis: A retrospective study of a patient cohort.", "abstract": "When elder arthritis patients suffered from complex supracondylar femoral fractures, their joints condition and general health condition elevate the difficulties in operation and post-surgical recovery.Here, we aimed to simplify the operation procedure by using one-step Total Knee Arthroplasty (TKA) with a stemmed femoral implant. We also investigated if this method could improve the patients' experience after the operation. The surgery including femoral osteotomy and implantation was performed on all fourteen patients by the same orthopedic specialist. The patients' hospitalization time was recorded. The recovery of knee function and patient satisfaction was evaluated by a systematic follow-up with average time 38 months, up to 5 5 years, using Hospital for Special Surgery (HSS) knee scores, the range of motion (ROM), anteroposterior and lateral radiography, and Visual Analog Scale (VAS) scores. The average of hospitalization days was 16 days. No angular deformity, malunion, or shortening were found at radiography.The average ROM was 105.2° at the end of the follow-up period. The knees in all the patients show adequate stability. All patients had returned to their former daily activities. Seventeen out of 24 patients were satisfied with the outcome of the surgery.The usage of TKA with a stemmed femoral implant is a reasonable method for elderly patients suffering from supracondylar femoral fractures and concomitant knee arthritis.", "keywords": "", "authors": [ { "name": "Wei Wang", "org": "Department of Orthopedics, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China." }, { "name": "Kun Yang", "org": "" }, { "name": "Pei Yang", "org": "" }, { "name": "Dandan Song", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Jinhui Song", "org": "" }, { "name": "Xiaohui Li", "org": "" }, { "name": "Kunzheng Wang", "org": "" } ], "venue": "Medicine", "year": 2018 }, "Ao8m9Tvb": { "id": "Ao8m9Tvb", "title": "Foxc2 regulates osteogenesis and angiogenesis of bone marrow mesenchymal stem cells.", "abstract": "Background: The Forkhead/Fox transcription factor Foxc2 is a critical regulator of osteogenesis and angiogenesis of cells. Bone marrow mesenchymal stem cells (BMSCs) have the capacity to differentiate into osteoblasts, chondrocytes, adipocytes, myocytes and fibroblasts. The present study investigates the role of Foxc2 overexpression in osteogenesis and angiogenesis of BMSCs in vitro. Methods: BMSCs were isolated from SD rat femurs and tibias, and characterized by cell surface antigen identification and osteoblasts and adipocytes differentiation. The cells were transfected with lentiviral Foxc2 (Lv-Foxc2) or green fluorescent protein (Lv-GFP). Seventy hours later, Foxc2 expression was observed using real time-PCR and Western blot. The transfected cells were stained with Alizarin red S or alkaline phosphatase (ALP) after osteogenic induction. Meanwhile, the expression levels of osteocalcin (OCN), Runt-related transcription factor 2 (Runx2), vascular endothelial growth factor (VEGF) and platelet-derived growth factor-beta (PDGF-beta) were measured by real time-PCR, Western blot and immunostaining. Results: Results of cell characterization showed that the cells were positive to CD44 (99.56%) and negative to CD34 (0.44%), and could differentiate into osteoblasts and adipocytes. Foxc2 overexpression not only increased the numbers of mineralized nodes and ALP activity, but also enhanced the expressions of Runx2, OCN, VEGF and PDGF-beta in transfected BMSCs after osteogenic induction. The effects of Foxc2 on osteogenesis and angiogenesis were significantly different between Lv-Foxc2 transfected BMSCs and Lv-GFP transfected BMSCs (P<0.05). In addition, the MAPK-specific inhibitors, PD98059 and LY294002, blocked the Foxc2-induced regulation of BMSC differentiation. Conclusions: Foxc2 gene is successfully transfected into BMSCs with stable and high expression. The overexpression of Foxc2 acts on BMSCs to stimulate osteogenesis and angiogenesis. The effect of Foxc2 on angiogenesis of the cells is mediated via activating PI3K and ERK.", "keywords": [ "Bone marrow mesenchymal stem cells", "Foxc2", "Osteogenesis", "Angiogenesis", "Differentiation" ], "authors": [ { "name": "Wulin You", "org": "Xi An Jiao Tong Univ, Dept Orthoped, Affilliated Hosp 2, Xian 710004, Shaanxi Provinc, Peoples R China" }, { "name": "Hongwei Gao", "org": "Xi An Jiao Tong Univ, Dept Orthoped, Hosp 9, Xian 710000, Shaanxi Provinc, Peoples R China" }, { "name": "Lihong Fan", "org": "Xi An Jiao Tong Univ, Dept Orthoped, Affilliated Hosp 2, Xian 710004, Shaanxi Provinc, Peoples R China" }, { "name": "Dapeng Duan", "org": "Xi An Jiao Tong Univ, Dept Orthoped, Affilliated Hosp 2, Xian 710004, Shaanxi Provinc, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Xi An Jiao Tong Univ, Dept Orthoped, Affilliated Hosp 2, Xian 710004, Shaanxi Provinc, Peoples R China" }, { "name": "Kunzheng Wang", "org": "Xi An Jiao Tong Univ, Dept Orthoped, Affilliated Hosp 2, Xian 710004, Shaanxi Provinc, Peoples R China" } ], "venue": "BMC MUSCULOSKELETAL DISORDERS", "year": 2013 }, "7b0wClXr": { "id": "7b0wClXr", "title": "Imaging measurement of normal knee in Northwestern aged people and its clinical significance in total knee arthroplasty", "abstract": "Objective: To provide the anatomic parameters and X-ray data of adult knee joint for the Northwestern Chinese people through measuring the knee joint of Northwestern aged people; at the same time, to provide reference for total knee arthroplasty (TKA) prosthesis design, selection and skills of surgery. Methods: Totally 200 Northwestern Chinese aged people, aged above 40 years old, 100 males and 100 females, were selected randomly. X-ray films of knee were shot in the anterioposterior view and lateral position. Measurement and recording, angle PT, angle FT, patellar thickness, tibial plateau to fibular head distance (DPF). When the values were obtained, they were statistically analyzed based on gender and side. And we compared them with foreign data. Results: Angle PT, angle FT, H and DPF did not differ significantly between the two sides (P>0.05). The differences in patellar thickness and DPF between patients of different gender was obvious (P<0.05), but there was no significant difference in angle PT and angle FT between the two genders (P>0.05). The differences in patellar thickness, DPF, angle PT and angle FT between the Chinese people and foreigners were obvious (P<0.05). Conclusion: Angle PT, Angle FT, DPF and patellar thickness should be measured routinely before TKA in order to ensure successful operations.", "keywords": [ "Knee joint", "Measurement", "Total knee arthroplasty (TKA)" ], "authors": [ { "name": "Tao Wang", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "WANG Kun-zheng", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "Wei Wang", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "Hui Qiang", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "Lei Wang", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" }, { "name": "WANG Chun-sheng", "org": "Xi'an Jiaotong University, School of Medicine(^ Medical School of Xi'an Jiaotong University),Xi An,China" } ], "venue": "Journal of Xi'an Jiaotong University (Medical Sciences)", "year": 2010 }, "3fjCViVt": { "id": "3fjCViVt", "title": "Analysis of the treatment result of total hip arthroplasty on the osteoarthritis secondary to developmental dysplasia hip", "abstract": "[Objective]To explore the result of total hip arthroplasty(THA) performed in patients with osteoarthritis secondary to developmental dysplasia of the hip(DDH) and the degree of hip dysplasia on the treatment result. [Method]Forty-seven cases(55 hips) with osteoarthritis secondary to DDH were treated with THA.According to the classification of Crowe,23 hips were in classⅠ,19 in classⅡand 13 in class Ⅲ/Ⅳ.Before operation,the morphological changes of acetabula and femurs were evaluated with helical CT.During the operation,the acetabula were reconstructed at the level of real acetabula,the femoral canal was carefully enlarged and the small and straight femoral protheses were employed.The Harris hip score was conducted in each patients preoperatively and postoperatively.[Result]The Harris hip score in class Ⅰ,Ⅱand Ⅲ/Ⅳ were from 50.7±7.6,44.9±6.2 and 41.1±8.2 preoperative to 90.6±3.7,87.3±4.5 and 82.7±7.3 postoperative,respectively.There was significant difference between them(P<0.05).Postoperative Harris hip score grading showed that the rate of excellence in class Ⅰ,Ⅱ and Ⅲ/Ⅳ were 100%,100%and 69%and the rate of good were 70%,53% and 31%respectively.After the follow-up of 23-81 months(mean 45 months),there was no prosthesis loosening and the hip function was good.[Conclusion]Total hip arthroplasty is a feasible method to treat osteoarthritis secondary to DDH.Its result in class Ⅰ and Ⅱ are better than that in class Ⅲ/Ⅳ.", "keywords": [ "developmental dysplasia of the hip", "total hip arthroplasty", "operation result" ], "authors": [ { "name": "LIU Rui-yu", "org": ",et al.Department of Orthopedics,the Second Affiliated Hospital,Medical College of Xi'an Jiaotong University,Xi'an,,China" }, { "name": "WANG Kun-zheng", "org": ",et al.Department of Orthopedics,the Second Affiliated Hospital,Medical College of Xi'an Jiaotong University,Xi'an,,China" }, { "name": "WANG Chun-sheng", "org": ",et al.Department of Orthopedics,the Second Affiliated Hospital,Medical College of Xi'an Jiaotong University,Xi'an,,China" } ], "venue": "Orthopedic Journal of China", "year": 2008 }, "msydsP4E": { "id": "msydsP4E", "title": "Changes of bone mineral in steroid-induced osteonecrosis in rabbits", "abstract": "Objective:To investigate the significance of bone mineral changes in the pathogenic process of steroid-induced osteonecrosis in rabbits. Methods:Seventy adult female Japanese White rabbits were randomly divided into five groups. Animals in steroid group received an intramuscular injection of methylprednisolone acetate (4 mg/kg) once a week, and killed in four different time after first treatment. Animals in control group received an intramuscular injection with the same volume of normal saline, while 150 kU penicillin was injected twice a week for preventing infection in all groups. The contents of serum calcium (Ca) and phosphorus (P) were determined and the bone mineral densities of the femoral head and neck were measured at the 2nd, 4th, 8th and 10th weeks after first treatment. Meanwhile the general condition such as weight, spirit and hair of rabbits was observed. Results:Compared with the control group, the weight of rabbits in steroid group lost since the first week, and progressively aggravated; the bone mineral density of the femoral head and neck was lowered since the 2nd and 4th week respectively (P<0.05, P<0.01), and lowered more quickly in femoral neck than in femoral head. In steroid group, the bone mineral density of the femoral neck at the 10th week was significantly lower than that at the 8th week (P<0.05). Compared with the control group, the serum levels of Ca and P in steroid group were lowered since the 2nd week (P<0.05, P<0.01). In steroid group, the serum Ca level at the 10th week was lower than that at the 8th week, and the serum P level waslowered more quickly than Ca level was. Conclusion:Osteonecrosis appears in rabbits shortly after corticoids are first administered, and osteonecrosis in rabbits is chronologically associated with the onset of hypocalcaemia, hypophosphatemia and lowered bone mineral density. Steroid-induced osteonecrosis may be relevant to bone mineral loss and density lowering of the femoral head and neck.", "keywords": [ "calcium", "phosphorus", "bone density", "femur head necrosis", "glucocorticoids" ], "authors": [ { "name": "tao wang", "org": "" }, { "name": "kunzheng wang", "org": "" }, { "name": "lei wang", "org": "" }, { "name": "jian guo", "org": "" }, { "name": "ying gao", "org": "" }, { "name": "zengtie zhang", "org": "" }, { "name": "liaosha jin", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "wei wang", "org": "" } ], "venue": "中国人民解放军军医大学学报(英文版)", "year": 2013 }, "6mJ8Kja8": { "id": "6mJ8Kja8", "title": "Role of reactive oxygen species in angiotensin II: induced receptor activator of nuclear factor-κB ligand expression in mouse osteoblastic cells.", "abstract": "Angiotensin II (Ang II) has been shown to induce receptor activator of nuclear factor-κB ligand (RANKL) expression in osteoblasts associated with its effect on reactive oxygen species (ROS) production. The objective of the present study was to investigate the potential pathways by which Ang II induces RANKL expression and the role of ROS in Ang II-induced RANKL expression in mouse osteoblastic MC3T3-E1 cells. Treatment with Ang IIinduced RANKL expression in a dose- and time-dependent manner in osteoblasts, which was attenuated by pre-treatment with an AT1 receptor antagonist (olmesartan), ROS scavenger (N-acetylcysteine, NAC), or the ERK inhibitor (U0126), but not with AT2R antagonist (PD123319). Furthermore, Ang II enhanced AT1R and NAD(P)H oxidase (NOX) p22(phox) and p67(phox) expression and activity in osteoblasts. In addition, Ang II promoted ROS production, which was mitigated by pre-treatment with olmesartan or a NOX inhibitor (diphenyleneiodonium, DPI), but not with PD1123319 or U0126, in osteoblasts. Moreover, Ang II enhanced the ERK1/2 phosphorylation, which was abrogated by pre-treatment with olmesartan, NAC, DPI, or U0126 in osteoblasts. These results suggest that Ang II, through its AT1R, enhanced NOX activity and ROS production, and activated the ERK pathway to up-regulate RANKL expression in osteoblasts in vitro.", "keywords": [], "authors": [ { "name": "Yanqiu Zhang", "org": "Department of Orthopaedics, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China." }, { "name": "Yongtao Zhang", "org": "" }, { "name": "Jianqiang Kou", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Kunzheng Wang", "org": "" } ], "venue": "Molecular and cellular biochemistry", "year": 2014 }, "zduEbEpK": { "id": "zduEbEpK", "title": "Prefabrication of vascularized porous three-dimensional scaffold induced from rhVEGF(165): a preliminary study in rats.", "abstract": "Several shortcomings have limited the routine use of autogenous vascularized bone graft. The present study investigates the prefabrication of vascularized scaffold with the desired shape and microarchitecture combined with recombinant human vascular endothelial growth factor 165 (rhVEGF(165)) to mimic autogenous vascularized bone graft.Eighty-five porous calcium phosphate cement scaffolds constructed by rapid prototyping technology were divided into four groups: group A [rhVEGF(165)-fibrin sealant (FS) scaffold], group B (hVEGF(165) scaffold), group C (FS scaffold), and group D (scaffold alone). The release of rhVEGF(165) from the scaffolds was examined in vitro. The vessel density, relative functionalized vessels, vessel diameter and relative vessel area were also measured.The sustained release of hVEGF(165) lasted 14 days in the absence of plasmin and 12 days in the presence of plasmin in group A and 10 days in group B. There was no statistical difference between groups A and B at 2 or 4 weeks in terms of vessel density, relative functionalized vessels, vessel diameter, and relative vessel area, as between groups C and D. However, the above parameters were greater in groups A and B than groups C and D.The scaffolds with the desired shape and microarchitecture combined with rhVEGF(165) could shorten the time needed for the construction of prefabricated vascularized grafts and accelerate the maturation of the vessels.", "keywords": [], "authors": [ { "name": "Pei Yang", "org": "Department of Orthopedics, Second Affiliated Hospital of Medical College of Xi'an Jiaotong University, Xi'an, Shaanxi, China." }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Zhibin Shi", "org": "" }, { "name": "Xin Huang", "org": "" }, { "name": "Xiaoqian Dang", "org": "" }, { "name": "Shanglong Xu", "org": "" }, { "name": "Kunzheng Wang", "org": "" } ], "venue": "Cells, tissues, organs", "year": 2009 }, "hTSONb0u": { "id": "hTSONb0u", "title": "Tetramethylpyrazine protects spinal cord and reduces inflammation in a rat model of spinal cord ischemia-reperfusion injury.", "abstract": "Inflammation, which is known to be detrimental to the neurologic outcome during the acute phase after an ischemic stroke, provides a potential target for preventive or therapeutic approach for spinal cord ischemia-reperfusion injury. Tetramethylpyrazine (TMP), a pure compound derived from Ligusticum chuanxiong, is widely used in the treatment of ischemic stroke. The present study aimed to gain a deeper insight into the mechanism underlying the anti-inflammatory effects of TMP on spinal cord ischemia-reperfusion injury.Spinal cord ischemia was induced in male Sprague-Dawley rats by balloon occlusion of the thoracic aorta. The experimental groups (n = 30 per group) included sham operation, control (receiving only normal saline), and TMP (30 mg/kg, 30 minutes before occlusion). Neurologic function was assessed by the Basso, Beattie, and Bresnahan (BBB) score at 1, 6, 12, 24, and 48 hours after reperfusion. Histologic changes were studied using Nissl staining. Infarct volume was analyzed using 2,3,5-triphenyltetrazolium chloride staining. Myeloperoxidase (MPO) activity was determined by using a rat MPO assay kit. Interleukin (IL)-1β, tumor necrosis factor (TNF)-α, IL-10 and nuclear factor (NF)-κB were examined with immunohistochemistry, enzyme-linked immunosorbent assay (ELISA) and Western blotting.Compared with the control group, the TMP group showed significantly improved neurologic outcome (P < .05), decreased infarct volume (42.3% vs 17.4%), and alleviated neutrophil infiltration (0.35 vs 0.18 U/g). TMP treatment reduced the expressions of proinflammatory cytokines TNF-α (28.62 vs 15.23 pg/mg protein) and IL-1β (13.62 vs 8.24 pg/mg protein), upregulated the expression of anti-inflammatory cytokine IL-10 (18.35 vs 31.26 pg/mg protein), and inhibited the activation of NF-κB (2.78 vs 1.22) in ischemic spinal cord.Treatment with TMP exerted a neuroprotective effect against spinal cord ischemia-reperfusion injury. The anti-inflammatory effect was believed to be one of the contributing mechanisms.", "keywords": [], "authors": [ { "name": "Lihong Fan", "org": "Department of Orthopedics, Second Affiliated Hospital of Medicine School of Xi′an Jiaotong University, Xi′an Shaanxi, China" }, { "name": "Kunzheng Wang", "org": "" }, { "name": "Zhibin Shi", "org": "Department of Orthopedics, Second Affiliated Hospital of Medicine School of Xi′an Jiaotong University, Xi′an Shaanxi, China" }, { "name": "Jun Die", "org": "Department of Orthopedics, the Fourth Hospital of Xi′an, Xi′an Shaanxi, China" }, { "name": "Chunsheng Wang", "org": "Department of Orthopedics, Second Affiliated Hospital of Medicine School of Xi′an Jiaotong University, Xi′an Shaanxi, China" }, { "name": "Xiaoqian Dang", "org": "Department of Orthopedics, Second Affiliated Hospital of Medicine School of Xi′an Jiaotong University, Xi′an Shaanxi, China" } ], "venue": "Journal of vascular surgery", "year": 2011 }, "epcuvXGB": { "id": "epcuvXGB", "title": "Development of a new pre-vascularized tissue-engineered construct using pre-differentiated rADSCs, arteriovenous vascular bundle and porous nano-hydroxyapatide-polyamide 66 scaffold.", "abstract": "Background: Development of a pre-vascularized tissue-engineered construct with intrinsic vascular system for cell growth and tissue formation still faces many difficulties due to the complexity of the vascular network of natural bone tissue. The present study was to design and form a new vascularized tissue-engineered construct using pre-differentiated rADSCs, arteriovenous vascular bundle and porous nHA-PA 66 scaffold. Methods: rADSCs were pre-differentiated to endothelial cells (rADSCs-Endo) and then incorporated in nHA-PA 66 scaffolds in vitro. Subsequently, in vivo experiments were carried out according to the following groups: Group A (rADSCs-Endo/nHA-PA 66 scaffold with arteriovenous vascular bundle), Group B (rADSCs/nHA-PA 66 scaffold with arteriovenous vascular bundle); Group C (nHA-PA66 scaffold with arteriovenous vascular bundle), Group D (nHA-PA 66 scaffold only). The vessel density and vessel diameter were measured based on histological and immunohistochemical evaluation, furthermore, the VEGF-C, FGF-2 and BMP-2 protein expressions were also evaluated by western blot analysis. Results: The results of in vivo experiments showed that the vessel density and vessel diameter in group A were significantly higher than the other three groups. Between Group B and C, no statistical difference was observed at each time point. In accordance with the results, there were dramatically higher expressions of VEGF-C and FGF-2 protein in Group A than that of Group B, C and D at 2 or 4 weeks. Statistical differences were not observed in VEGF-C and FGF-2 expression between Group B and C. BMP-2 was not expressed in any group at each time point. Conclusions: Compared with muscular wrapping method, arteriovenous vascular bundle implantation could promote vascularization of the scaffold; and the angiogenesis of the scaffold was significantly accelerated when pre-differentiated rADSCs (endothelial differentiation) were added. These positive results implicate the combination of pre-differentiated rADSCs (endothelial differentiation) and arteriovenous vascular bundle may achieve rapidly angiogenesis of biomaterial scaffold.", "keywords": [ "Adipose-derived stem cells", "Tissue engineering", "Angiogenesis", "Scaffolds", "Prefabrication" ], "authors": [ { "name": "Pei Yang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Coll Med, Xian 710004, Shaanxi, Peoples R China" }, { "name": "Xin Huang", "org": "Xi An Jiao Tong Univ, Key Lab Environm & Genes Related Dis, Affiliated Hosp 1, Dept Cardiol,Med Coll,Ion Channel Dis Lab,Educ Mi, Xian 710061, Shaanxi, Peoples R China" }, { "name": "Jacson Shen", "org": "Wellesley Coll, Dept Biol Chem, Wellesley, MA 02481 USA" }, { "name": "Chunsheng Wang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Coll Med, Xian 710004, Shaanxi, Peoples R China" }, { "name": "Xiaoqian Dang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Coll Med, Xian 710004, Shaanxi, Peoples R China" }, { "name": "Henry Mankin", "org": "Massachusetts Gen Hosp, Dept Orthopaed Surg, Boston, MA 02114 USA" }, { "name": "Zhenfeng Duan", "org": "Massachusetts Gen Hosp, Dept Orthopaed Surg, Boston, MA 02114 USA" }, { "name": "Kunzheng Wang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Coll Med, Xian 710004, Shaanxi, Peoples R China" } ], "venue": "BMC MUSCULOSKELETAL DISORDERS", "year": 2013 }, "AM9Q9kB0": { "id": "AM9Q9kB0", "title": "Effects of sodium ferulate on preventing steroid-induced femoral head osteonecrosis in rabbits", "abstract": "The aim of this study is to investigate the effects and possible mechanisms of sodium ferulate (SF) on anti-apoptosis in steroid-induced femoral head osteonecrosis in rabbits. Japanese white rabbits were randomly divided into three groups (control group, treatment group, and model group), each with 24 rabbits. The model and treatment groups were first injected with an intravenous dose of horse serum, 10 ml/kg, three weeks later with an intravenous dose of 7.5 ml/kg, and two weeks later with an intramuscular dose of methylprednisolone, 45 mg/kg, three times in order to establish rabbit models of osteonecrosis. Concurrently, the treatment group was injected with intravenous doses of SF 20 mg/kg for two weeks, once per day. Three time points, Weeks 2, 4, and 8, were selected after modeling was completed. Osteonecrosis was verified by histopathology with haematoxylin-eosin (HE) staining. The apoptosis rate of osteonecrosis was observed by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay. The apoptosis expressions of caspase-3 and Bcl-2 were analyzed by immunohistochemistry and Western blot. The rabbit models of osteonecrosis were successfully established and observed by HE staining. SF was effective in intervening in apoptosis and decreasing the apoptosis rate in femoral head necrosis by the immunohistochemistry and TUNEL assay (P<0.01). Western blot analysis indicated that there were statistical significances in the protein levels of caspase-3 and Bcl-2 (P<0.01). SF has a protective effect by reducing the incidence of early steroid-induced femoral head necrosis in rabbits, effectively intervening in apoptosis through decreasing caspase-3 expression and up-regulating Bcl-2 expression.", "keywords": [ "Femoral head necrosis", "Glucocorticoid", "Sodium ferulate", "Apoptosis", "Rabbit", "R684.3" ], "authors": [ { "name": "Lei Tian", "org": "Department of Orthopedics, the Second Affiliated Hospital, College of Medicine,Xi’an Jiaotong University,Xi’an,China" }, { "name": "Xiao-qian Dang", "org": "Department of Orthopedics, the Second Affiliated Hospital, College of Medicine,Xi’an Jiaotong University,Xi’an,China" }, { "name": "Chun-sheng Wang", "org": "Department of Orthopedics, the Second Affiliated Hospital, College of Medicine,Xi’an Jiaotong University,Xi’an,China" }, { "name": "Pei Yang", "org": "Department of Orthopedics, the Second Affiliated Hospital, College of Medicine,Xi’an Jiaotong University,Xi’an,China" }, { "name": "Chen Zhang", "org": "Department of Orthopedics, the Second Affiliated Hospital, College of Medicine,Xi’an Jiaotong University,Xi’an,China" }, { "name": "Kun-zheng Wang", "org": "Department of Orthopedics, the Second Affiliated Hospital, College of Medicine,Xi’an Jiaotong University,Xi’an,China" } ], "venue": "Journal of Zhejiang University. Science. B", "year": 2013 }, "oOzbZFIG": { "id": "oOzbZFIG", "title": "Comparative study of complications in intertrochanteric fracture treated by internal fixation or hemiarthroplasty", "abstract": "Objective To explore the mortality rate and the incidence of complications of intertrochanteric fracture treated with hemiarthroplasty or internal fixation one year after operation. Methods 162 cases (162 hips) of intertrochanteric fracture were admitted in our department between October, 2005 to October, 2010. 35 cases did not complete follow-up visit. Among the remaining 127cases (127 hips), 44 patients were treated with dynamic hip screws (DHS), 40 patients were treated with proximal femoral nail (PFN), and 43 patients were treated with artificial joint replacement. The mortality rate, the incidence of complications and curative effect of different treatments were compared one year after operation. Results There were statistical differences among three groups in the volume of blood loss and operation time. According to Harris evaluation standard, the excellent and good rate was 77.3% in DHS group, 77.5% in PFN group, and 95.3% in artificial joint replacement group. The excellent and good rate of artificial joint replacement was significantly higher than that of DHS group and PFN group (χ2=6.654,P<0.05). The total incidence of complications in DHS group (38.6%) was significantly higher than PFN group (17.5%) and artificial joint replacement group (13.9%) (χ2=8.557,P<0.05). The mortality rate was 18% in DHS group, 11% in PFN group and 2% in artificial joint replacement group. Conclusions Artificial joint replacement is an effective treatment for intertrochanteric fracture.", "keywords": [ "Dynamic hip screws (DHS)", "Intertrochanteric fracture", "Proximal femoral nail (PFN)" ], "authors": [ { "name": "WANG Chun-sheng", "org": ". Department of Orthopaedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "ZHANG Yong-tao", "org": ". Department of Orthopaedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "YANG Pei", "org": ". Department of Orthopaedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" }, { "name": "WANG Kun-zheng", "org": ". Department of Orthopaedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an , China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Edition)", "year": 2012 }, "xtw8zJ78": { "id": "xtw8zJ78", "title": "Effect of one versus two distal locking bolts on the biomechanics of tibial interlocking nail: a comparative study using a new model.", "abstract": "To investigate the impact of one versus two distal locking bolts on the mechanical properties of tibial interlocking intramedullary nails.Twenty 9-mm titanium alloy locking nails were divided into two equal groups in which the nails were fixed with only one and two distal locking bolts, respectively. Each group was further divided into two sub-groups for compression and torsion tests separately using a universal material-testing machine.In the compression tests, the average maximum strength of double bolts was greater than that of the single bolt (P<0.05), but the number of the bolts did not significantly affect the results of the torsion tests in terms of the either the maximum torsion moment or angle (P>0.05).One distal bolt is sufficient for fixing stable fractures and double bolts are recommended for management of serious fractures. The model we used is convenient and economic for examining the biomechanics of the tibial nails, especially for comparative purposes.", "keywords": [ "interlocking nails", "biomechanics", "distal bolts" ], "authors": [ { "name": "Fu-liang Gong", "org": "Department of Orthopedic Surgery, Second Hospital of Xi'an Jiaotong University, Xi'an 710004, China. gflchina@163.com" }, { "name": "Kun-zheng Wang", "org": "" }, { "name": "Xiao-qian Dang", "org": "" }, { "name": "Chun-sheng Wang", "org": "" }, { "name": "Zhi-bin Shi", "org": "" } ], "venue": "Di 1 jun yi da xue xue bao = Academic journal of the first medical college of PLA", "year": 2005 }, "jeNqKWcn": { "id": "jeNqKWcn", "title": "Anti-apoptotic and neuroprotective effects of Tetramethylpyrazine following spinal cord ischemia in rabbits.", "abstract": "Tetramethylpyrazine (TMP) is one of the most important active ingredients of a Chinese herb Ligusticum wallichii Franchat, which is widely used in many ischemia disorders treatments. However, the exact mechanism by which TMP protects the spinal cord ischemia/reperfusion (I/R) injury is still unknown. For this purpose, rabbits were randomly divided into sham group, control group and TMP group. After the evaluation of neurologic function, the spinal cords were immediately removed for biochemical and histopathological analysis. Apoptosis was measured quantitatively by the terminal transferase UTP nick end-labeling (TUNEL) method and confirmed by electron microscopic examination, the expression of Bax and Bcl-2 was immunohistochemically evaluated and quantified by Western blot analysis.Neurologic outcomes in the TMP-group were significantly better than those in the control group (P < 0.05). TMP decreased spinal cord malondialdehyde (MDA) levels and ameliorated the down regulation of spinal cord superoxide dismutase (SOD) activity. TMP significantly reduced the loss of motoneurons and TUNEL-positive rate. Greater Bcl-2 and attenuated Bax expression was found in the TMP treating rabbits.These findings suggest that TMP has protective effects against spinal cord I/R injury by reducing apoptosis through regulating Bcl-2 and Bax expression.", "keywords": [ "active ingredient", "apoptosis", "down regulation", "neurosciences", "electron microscope", "control group", "up regulation", "neurobiology" ], "authors": [ { "name": "Li-Hong Fan", "org": "Department of Orthopedics, Second Affiliated Hospital Xi'an Jiao Tong University, Xiwu Road, Xi'an, shaanxi, 710004, China" }, { "name": "Kun-Zheng Wang", "org": "Department of Orthopedics, Second Affiliated Hospital Xi'an Jiao Tong University, Xiwu Road, Xi'an, shaanxi, 710004, China" }, { "name": "Bin Cheng", "org": "Department of Orthopedics, Second Affiliated Hospital Xi'an Jiao Tong University, Xiwu Road, Xi'an, shaanxi, 710004, China" }, { "name": "Chun-Sheng Wang", "org": "Department of Orthopedics, Second Affiliated Hospital Xi'an Jiao Tong University, Xiwu Road, Xi'an, shaanxi, 710004, China" }, { "name": "Xiao-Qian Dang", "org": "Department of Orthopedics, Second Affiliated Hospital Xi'an Jiao Tong University, Xiwu Road, Xi'an, shaanxi, 710004, China" } ], "venue": "BMC neuroscience", "year": 2006 }, "I8OgUqiv": { "id": "I8OgUqiv", "title": "1,25(OH) 2 D 3 promotes chondrocyte apoptosis and restores physical function in rheumatoid arthritis through the NF-κB signal pathway.", "abstract": "We explored the modulatory effect of 1,25(OH)(2)D-3 on chondrocytes and physical function in rats with RA and its mechanism underlying the regulation of NF-kappa B signal pathway. RA patients and healthy volunteers were selected. Sprague-Dawley (SD) rats were used to establish RA models. The paw volume of rats was estimated. Chondrocytes were isolated from RA rats. The protein levels in both cartilage tissues and chondrocytes were determined using western blotting. Apoptosis was evaluated using TUNEL assay. Serum levels of IL-1 beta, IL-6, IL10 and IL-17 were measured by enzyme-linked immunosorbent assay (ELISA). Serum levels of 1,25(OH)(2) D-3 were lower in RA patients than in healthy volunteers. Rats in the RA + VD3 group were lighter than those in normal and PBS groups, with an increased paw volume, severer joint swelling, higher expression levels of p-I kappa B alpha, p-p65, IL-1 beta, IL-6, and IL-17, and lower expression level of IL-10, while those in RA and RA + VD3 + NF-kappa B group differed more significantly. In addition, by comparing RA rats and RA + NF-kappa B rats, we found that TNF-alpha stimulation exacerbated RA, increased expression levels of p-I kappa B alpha, p-p65, IL-1 beta, IL-6, and IL-17, and decreased the expression level of IL-10. Compared with RA chondrocytes, chondrocytes from RA + VD 3 rats exhibited lower expression levels of p-I kappa B alpha and p-p65, and had more apoptotic cells, while those from RA + NF-kappa B rats showed an opposite trend. Taken together, 1,25(OH)(2)D-3 accelerates chondrocyte apoptosis and improve physical function in rats with RA by the inhibition of NF-kappa B signal pathway.", "keywords": [ "1", "25(OH)(2)D-3", "NF-kappa B signal pathway", "Rheumatoid arthritis", "Paw volume", "Chondrocyte", "Apoptosis" ], "authors": [ { "name": "Run Tian", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Hlth Sci Ctr, 157 Xiwu Rd, Xian 710004, Shanxi, Peoples R China" }, { "name": "Xiaofang Li", "org": "Xi An Jiao Tong Univ, Dept Gynaecol & Obstet, Affiliated Hosp 2, Hlth Sci Ctr, Xian 710004, Shanxi, Peoples R China" }, { "name": "Yue Li", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Hlth Sci Ctr, 157 Xiwu Rd, Xian 710004, Shanxi, Peoples R China" }, { "name": "Kunzheng Wang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Hlth Sci Ctr, 157 Xiwu Rd, Xian 710004, Shanxi, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Hlth Sci Ctr, 157 Xiwu Rd, Xian 710004, Shanxi, Peoples R China" }, { "name": "Pei Yang", "org": "Xi An Jiao Tong Univ, Dept Orthopaed, Affiliated Hosp 2, Hlth Sci Ctr, 157 Xiwu Rd, Xian 710004, Shanxi, Peoples R China" } ], "venue": "BIOMEDICINE & PHARMACOTHERAPY", "year": 2018 }, "ZK3oi3aa": { "id": "ZK3oi3aa", "title": "Core decompression in combination with nano-hydroxyapatite/polyamide 66 rod for the treatment of osteonecrosis of the femoral head.", "abstract": "The aim of this study was to investigate the effectiveness of core decompression in combination with a nano-hydroxyapatite/polyamide 66 (n-HA/PA66) rod and a porous bioglass bone graft for the treatment of osteonecrosis of the femoral head (ONFH).Sixty-four patients (84 hips) with ONFH were allocated to a program of either core decompression (CD) in combination with a n-HA/PA66 rod and a porous bioglass bone graft (treatment group) or CD with an autologous cancellous bone graft (control group). Clinical and radiographic retrospective follow-ups were performed on all patients with the prospectively collected data.The overall clinical failure rate in the treatment group (9/38, 23.68%) was lower than that of the control group (24/46, 52.17%) (p < 0.05). Harris hip scores (HHS) were significantly increased in both groups post-surgery (p < 0.05). There was a significant difference between the two groups on HHS improvement for Steinberg IIC and IIIA (p < 0.05 and p < 0.001, respectively). The visual analogue scale (VAS) was significantly decreased in both groups post-surgery (p < 0.05). Especially, significant difference in the VAS improvement was observed between the groups for IIB, IIC and IIIA (p < 0.05, p < 0.05 and p < 0.01, respectively).Core decompression combined with the implantation of a n-HA/PA66 rod and a bioglass bone graft can significantly decrease hip pain, improve hip function, and prevent the collapse of the femoral head in patients with ONFH. As the effectiveness of this approach appears to vary with Steinberg stage, we suggest that this treatment procedure may be suitable for patients with early to middle stage ONFH.", "keywords": [ "follow-up", "bone graft", "biomaterials", "osteonecrosis of the femoral head", "core decompression" ], "authors": [ { "name": "Pei Yang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Chuanbao Bian", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Xin Huang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Anli Shi", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Chunsheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" }, { "name": "Kunzheng Wang", "org": "Xi'an Jiaotong University(Xi'an Jiaotong University,Xi'an Jiaotong Univ,Xi'an Jiaotong Univ.),Xi An,China" } ], "venue": "Archives of orthopaedic and trauma surgery", "year": 2014 }, "xEE8SMND": { "id": "xEE8SMND", "title": "Effects of olfactory ensheathing cells transplantation into local part on neurons in spinal cord and ganglion after transection of peripheral nerve", "abstract": "AIM: To observe the effects of local transplantation of olfactory ensheathing cells (OECs) on neurons in spinal cord and ganglion after incision of peripheral nerves,so as to provide experimental basis for treatment of peripheral nerve injury by OECs transplantation. METHODS: The experiment was conducted in the Experimental Center of Animals,Medical College of Xi'an Jiao Tong University from August 2005 to January 2006. Fifty-five healthy SD adult rats were selected and randomly divided into 3 groups: control group (n=25),experiment group (n=25) and blank control group (n=5). ① Rats in the control group and experiment group were liberated of all branches of sciatic nerve in the incisura ischiadica and transected at the distal end. A incision was made on the inner lateral tunica muscularis of semitendinosus to embed all free branches of broken end into the muscle. The perilemma and tunica muscularis were sutured to fix,and rats in the experiment group were injected with 0.1 mL of OECs (1×109 L-1) at the muscle 2 mm away from the bilateral parts of incision. Rats in the blank control group were injected with cell culture fluid DMEM. Rats in the blank control group were exposed the sciatic nerve without transection. ②Rats in the control group and experiment group were executed in batch respectively at 1,2,3,7 and 14 days after operation with 5 rats each time,while rats in the blank group were executed at 14 days after operation,and changes in neurons were observed with pathological and TUNEL methods. RESULTS: A total of 55 enrolled rats were involved in the analysis of results. ① Changes in the survival rate of motor neurons of anterior horn were studied by HE staining in each group after sciatic nerve injury at different time-point: At 7 and 14 days after operation,the morphous changes of motor neurons of cornu anterius medullae spinalis in rats of the experiment group were similar to those in the control group,while the amount of degeneration were significantly less than those in the control group,and the survival nerve neurons were obviously greater than those in the control group (P < 0.01). ②Changes in apoptotic index of motor nerve in the anterior horn of injured side in each group after transection of sciatic nerve: Those in the control group at 3,7 and 14 days after operation were remarkably greater than those in the experiment group (2.1±1.1)%,(1.2±0.8)%;(3.1±1.1)%,(1.4±0.6)%;(6.1±1.8)%,(4.1±1.3)%,P < 0.05. ③ Changes in apoptotic index of neurons in the ganglion of injured side in each group after transection of sciatic nerve: the apoptotic positive cells of sensory neurons in ganglion at 7 and 14 days later were less in the experiment group than those in the control group (2.1±0.32)%,(4.4±0.56)%;(4.3±1.8)%,(6.7±2.5)%,P < 0.05. CONCLUSION: There are apoptotic neuron in the spinal cord and ganglion after peripheral nerve injury,while the OECs has protective effect on apoptotic neurons.", "keywords": [ "null" ], "authors": [ { "name": "Song Jin-hui", "org": "Department of Orthopedics,Second Hospital Affiliated to Xi'an Jiao Tong University,Xi'an ,Shaanxi Province,China" }, { "name": "Qi Wen-bing", "org": "First Department of Orthopedics and Traumatology,Baoji Municipal Hospital of Traditional Chinese Medicine,Baoji ,Shaanxi Province,China" }, { "name": "Wang Chun-sheng", "org": "Department of Orthopedics,Second Hospital Affiliated to Xi'an Jiao Tong University,Xi'an ,Shaanxi Province,China" }, { "name": "Shi Zhi-bin", "org": "Department of Orthopedics,Second Hospital Affiliated to Xi'an Jiao Tong University,Xi'an ,Shaanxi Province,China" }, { "name": "Wang Kun-zheng", "org": "Department of Orthopedics,Second Hospital Affiliated to Xi'an Jiao Tong University,Xi'an ,Shaanxi Province,China" } ], "venue": "Chinese Journal of Clinical Rehabilitation", "year": 2006 }, "fLmEwLla": { "id": "fLmEwLla", "title": "The effects of recombinant adeno-associated virus vector co-expressing hVEGF165 and hBMP-7 genes in steroids-induced avascular necrosis of femoral head", "abstract": "Objective To investigate the effects of recombinant adeno-associated virus vector co-expressing hVEGF165 and hBMP-7 genes in steroids-induced avascular necrosis of femoral head.Methods The rabbit model of femoral head necrosis was constructed by combination use of lipopolysaccharide and methylprednisolone.30 adult rabbits with femoral head necrosis selected by MRI were randomly divided into three groups as follows:model group,core decompression group and virus treatment group.rAAV-hVEGF165-IRES-hBMP-7 virus vector was injected into core decompression region after core decompression operation in the treatment group.The femoral head was examined by radionuclide scan,gross observation,histopathological staining,and immunohistochemistry staining for VEGF and BMP at 12 weeks after virus injection.Results Early animal model of femoral head necrosis was successfully established according to MRI,gross observation and HE staining.Comparing with model group and core decompression group,in virus treatment group,necrosis of femoral head was significantly reduced;VEGF and BMP expressions were increased;and the metabolism of bone marrow tissue was exuberant.The differences of these three groups were statistically significant(P<0.05).ConclusionsThe recombinant adeno-associated virus vector rAAV-hVEGF165-IRES-hBMP7 can improve bone repair capacity in necrosis region of femoral head by increasing the blood supply of cavum medullare tissue and improving the bone quality of femoral head.", "keywords": [ "Bone morphogenetic protein(BMP)", "Vascular endothelial growth factor(VEGF)", "Rabbits", "Femur head necrosis", "Adeno-associated virus" ], "authors": [ { "name": "ZHANG Chen", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "WANG Kun-zheng", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "DANG Xiao-qian", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "WANG Chun-sheng", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "YANG Pei", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" }, { "name": "FAN Li-hong", "org": ".Department of Orthopedics,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an ,China" } ], "venue": "Chinese Journal of Joint Surgery(Electronic Edition)", "year": 2012 }, "tg4l0Kht": { "id": "tg4l0Kht", "title": "In vitro antibacterial activity and cytocompatibility of magnesium-incorporated poly(lactide-co-glycolic acid) scaffolds.", "abstract": "Bone defects are often combined with the risk of infection in the clinic, and artificial bone substitutes are often implanted to repair the defective bone. However, the implant materials are carriers for bacterial growth, and biofilm can form on the implant surface, which is difficult to eliminate using antibiotics and the host immune system. Magnesium (Mg) was previously reported to possess antibacterial potential. In this study, Mg was incorporated into poly(lactide-co-glycolic acid) (PLGA) to fabricate a PLGA/Mg scaffold using a low-temperature rapid-prototyping technique. All scaffolds were divided into three groups: PLGA (P), PLGA/10 wt% Mg with low Mg content (PM-L) and PLGA/20 wt% Mg with high Mg content (PM-H). The degradation test of the scaffolds was conducted by immersing them into the trihydroxymethyl aminomethane–hydrochloric acid (Tris–HCl) buffer solution and measuring the change of pH values and concentrations of Mg ions. The antibacterial activity of the scaffolds was investigated by the spread plate method, tissue culture plate method, scanning electron microscopy and confocal laser scanning microscopy. Additionally, the cell attachment and proliferation of the scaffolds were evaluated by the cell counting kit-8 (CCK-8) assay using MC3T3-E1 cells. The Mg-incorporated scaffolds degraded and released Mg ions and caused an increase in the pH value. Both PM-L and PM-H inhibited bacterial growth and biofilm formation, and PM-H exhibited higher antibacterial activity than PM-L after incubation for 24 and 48 h. Cell tests revealed that PM-H exerted a suppressive effect on cell attachment and proliferation. These findings demonstrated that the PLGA/Mg scaffolds possessed favorable antibacterial activity, and a higher content of Mg (20%) exhibited higher antibacterial activity and inhibitory effects on cell attachment and proliferation than low Mg content (10%).", "keywords": [ "Magnesium", " Antibacterial activity", " Poly(lactide-co-glycolic acid)", " Infection", " Scaffold" ], "authors": [ { "name": "Rui Ma", "org": "Department of Bone and Joint Surgery, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China" }, { "name": "Wei Wang", "org": "Department of Bone and Joint Surgery, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China" }, { "name": "Pei Yang", "org": "Department of Bone and Joint Surgery, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China" }, { "name": "Chunsheng Wang", "org": "Department of Bone and Joint Surgery, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China" }, { "name": "Dagang Guo", "org": "State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, China" }, { "name": "Kunzheng Wang", "org": "Department of Bone and Joint Surgery, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China" } ], "venue": "BioMedical Engineering OnLine", "year": 2020 }, "Livyu3Dd": { "id": "Livyu3Dd", "title": "High-Performance All-Inorganic Solid-State Sodium–Sulfur Battery", "abstract": "All-inorganic solid-state sodium–sulfur batteries (ASSBs) are promising technology for stationary energy storage due to their high safety, high energy, and abundant resources of both sodium and sulfur. However, current ASSB shows poor cycling and rate performances mainly due to the huge electrode/electrolyte interfacial resistance arising from the insufficient triple-phase contact among sulfur active material, ionic conductive solid electrolyte, and electronic conductive carbon. Herein, we report an innovative approach to address the interfacial problem using a Na3PS4–Na2S–C (carbon) nanocomposite as the cathode for ASSBs. Highly ionic conductive Na3PS4 contained in the nanocomposite can function as both solid electrolyte and active material (catholyte) after mixing with electronic conductive carbon, leading to an intrinsic superior electrode/electrolyte interfacial contact because only a two-phase contact is required for the charge transfer reaction. Introducing nanosized Na2S into the nanocomposite cath...", "keywords": [ "nanocomposite", "electrode design", "all-inorganic", "all-solid-state", "sodium-sulfur battery" ], "authors": [ { "name": "Jie Yue", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Xiangyang Zhu", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Zhaohui Ma", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Jian Yang", "org": "Shandong Univ, Sch Chem & Chem Engn, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" } ], "venue": "ACS Nano", "year": 2017 }, "LvmAKYyA": { "id": "LvmAKYyA", "title": "Tuning Anionic Chemistry To Improve Kinetics of Mg Intercalation", "abstract": "Rechargeable Mg batteries (RMBs) hold great promise for high energy density in consumer electronics because of the high theoretical volumetric capacity and dendrite-free stripping/plating of Mg. Their development, however, is severely limited by the sluggish diffusion of Mg2+ in inorganic cathodes, mainly induced by strong interaction between Mg2+ and host anions. Herein, for the first time, we systematically investigate how anionic chemistry (O, S, and Se) affects Mg2+ migration in layered MX2 (M = Ti and V; X = O, S, and Se), by combining theoretical density functional theory (DFT) calculations with electrochemical characterizations. At room temperature, TiSe2 and VSe2 achieve much better electrochemical performance than TiS2 and VS2, due to the faster migration of Mg2+ in selenide than in sulfide and oxide, as demonstrated by electrochemical kinetic characterizations and DFT calculations. The improved kinetics of selenide can be attributed to three criteria: (i) larger diffusion channel, (ii) weaker in...", "keywords": "", "authors": [ { "name": "Minglei Mao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Minglei Mao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Jianmin Ma", "org": "State Key Laboratory of Chemo/Biosensing and Chemometrics, School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "Chemistry of Materials", "year": 2019 }, "gNpcSbxK": { "id": "gNpcSbxK", "title": "High-Fluorinated Electrolytes for Li-S Batteries", "abstract": "Rechargeable Li-S batteries are regarded as one of the most promising next-generation energy-storage systems. However, the inevitable formation of Li dendrites and the shuttle effect of lithium polysulfides significantly weakens electrochemical performance, preventing its practical application. Herein, a new class of localized high-concentration electrolyte (LHCE) enabled by adding inert fluoroalkyl ether of 1H, 1H, 5H-octafluoropentyl-1,1,2,2- tetrafluoroethyl ether into highly-concentrated electrolytes (HCE) lithium bis(fluorosulfonyl) imide/dimethoxyether (DME) system is reported to suppress Li dendrite formation and minimize the solubility of the high-order polysulfides in electrolytes, thus reducing the amount of electrolyte in cells. Such a unique LHCE can achieve a high coulombic efficiency of Li plating/ stripping up to 99.3% and completely suppressing the shuttling effect, thus maintaining a S cathode capacity of 775 mAh g(-1) for 150 cycles with a lean electrolyte of 4.56 g A(-1) h(-1). The LHCE reduces the solubility of lithium polysulfides, allowing the Li/S cell to achieve super performance in a lean electrolyte. This conception of using inert diluents in a highly concentrated electrolyte can accelerate commercialization of Li-S battery technology.", "keywords": [ "inert fluorinated diluents", "Li-S batteries", "lithium dendrite", "localized high-concentration electrolyte", "polysulfide shuttle" ], "authors": [ { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Guangbin Ji", "org": "College of Materials Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 P. R. China" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Qin Li", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Haiyang Wang", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Yong Yang", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Kerry C. DeMella", "org": "Department of Chemistry and Biochemistry; University of Maryland; College Park MD 20742 USA" }, { "name": "Srinivasa R. Raghavan", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2019 }, "Vt7lrjnw": { "id": "Vt7lrjnw", "title": "Red phosphorus-single-walled carbon nanotube composite as a superior anode for sodium ion batteries.", "abstract": "Sodium ion batteries (SIBs) have been considered as a top alternative to lithium ion batteries due to the earth abundance and low cost of sodium compared with lithium. Among all proposed anode materials for SIBs, red phosphorus (P) is a very promising candidate because it has the highest theoretical capacity (∼2600 mAh/g). In this study, a red P-single-walled carbon nanotube (denoted as red P-SWCNT) composite, in which red P is uniformly distributed between tangled SWCNTs bundles, is fabricated by a modified vaporization-condensation method. Benefiting from the nondestructive preparation process, the highly conductive and mechanically strong SWCNT network is preserved, which enhances the conductivity of the composite and stabilizes the solid electrolyte interphase. As a result, the red P-SWCNT composite presents a high overall sodium storage capacity (∼700 mAh/gcomposite at 50 mA/gcomposite), fast rate capability (∼300 mAh/gcomposite at 2000 mA/gcomposite), and stable long-term cycling performance with 80% capacity retention after 2000 sodiation-desodiation cycles. The red P-SWCNT composite fabricated by the vaporization-condensation method significantly extends the cycling stability of P/carbon composite from current ∼100 cycles to ∼2000 cycles.", "keywords": [ "anode", "carbon nanotubes", "phosphorus", "sodium ion batteries" ], "authors": [ { "name": "Yujie Zhu", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Yang Wen", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Xiulin Fan", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Tao Gao", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Fudong Han", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Chao Luo", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Sz-Chian Liou", "org": "‡Maryland Nanocenter, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Chunsheng Wang", "org": "†Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." } ], "venue": "ACS nano", "year": 2015 }, "1cmgyFNK": { "id": "1cmgyFNK", "title": "An artificial interphase enables reversible magnesium chemistry in carbonate electrolytes.", "abstract": "Magnesium-based batteries possess potential advantages over their lithium counterparts. However, reversible Mg chemistry requires a thermodynamically stable electrolyte at low potential, which is usually achieved with corrosive components and at the expense of stability against oxidation. In lithium-ion batteries the conflict between the cathodic and anodic stabilities of the electrolytes is resolved by forming an anode interphase that shields the electrolyte from being reduced. This strategy cannot be applied to Mg batteries because divalent Mg cannot penetrate such interphases. Here, we engineer an artificial Mg-conductive interphase on the Mg anode surface, which successfully decouples the anodic and cathodic requirements for electrolytes and demonstrate highly reversible Mg chemistry in oxidation-resistant electrolytes. The artificial interphase enables the reversible cycling of a Mg/VO full-cell in the water-containing, carbonate-based electrolyte. This approach provides a new avenue not only for Mg but also for other multivalent-cation batteries facing the same problems, taking a step towards their use in energy-storage applications.", "keywords": "", "authors": [ { "name": "Seoung-Bum Son", "org": "National Renewable Energy Laboratory, Golden, CO, USA." }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Steve P Harvey", "org": "National Renewable Energy Laboratory, Golden, CO, USA." }, { "name": "K Xerxes Steirer", "org": "Department of Physics, Colorado School of Mines, Golden, CO, USA." }, { "name": "Adam Stokes", "org": "Department of Materials Science, Colorado School of Mines, Golden, CO, USA." }, { "name": "Andrew Norman", "org": "National Renewable Energy Laboratory, Golden, CO, USA." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Arthur Cresce", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA." }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA." }, { "name": "Chunmei Ban", "org": "National Renewable Energy Laboratory, Golden, CO, USA. chunmei.ban@nrel.gov." } ], "venue": "Nature chemistry", "year": 2018 }, "hGPZ4Dz4": { "id": "hGPZ4Dz4", "title": "Tailoring Surface Acidity of Metal Oxide for Better Polysulfide Entrapment in Li-S Batteries", "abstract": "The polysulfide shuttle reaction has severely limited practical applications of Li-S batteries. Recently, functional materials that can chemically adsorb polysulfide show significant enhancement in cycling stability and Coulombic efficiency. However, the mechanism of the chemisorption and the control factors governing the chemisorption are still not fully understood. Here, it is demonstrated for the first time that the surface acidity of the host material plays a crucial role in the chemisorption of polysulfide. By tailoring the surface acidity of TiO2 via heteroatom doping, the polysulfide-TiO2 interaction can be fortified and thus significantly the capacity fading be reduced to 0.04% per cycle. The discovery presented here sheds light on the mechanism of this interfacial phenomenon, and opens a new avenue that can lead to a practical sulfur/host composite cathode.", "keywords": "", "authors": [ { "name": "Xiwen Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Xiwen Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Yiqing Wu", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Zhian Zhang", "org": "School of Metallurgy and Environment Central South University Changsha 410083 China" }, { "name": "Jie Li", "org": "School of Metallurgy and Environment Central South University Changsha 410083 China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2016 }, "FlzCinkw": { "id": "FlzCinkw", "title": "Bi Nanoparticles Anchored in N-Doped Porous Carbon as Anode of High Energy Density Lithium Ion Battery.", "abstract": "A novel bismuth-carbon composite, in which bismuth nanoparticles were anchored in a nitrogen-doped carbon matrix (Bi@NC), is proposed as anode for high volumetric energy density lithium ion batteries (LIBs). Bi@NC composite was synthesized via carbonization of Zn-containing zeolitic imidazolate (ZIF-8) and replacement of Zn with Bi, resulting in the N-doped carbon that was hierarchically porous and anchored with Bi nanoparticles. The matrix provides a highly electronic conductive network that facilitates the lithiation/delithiation of Bi. Additionally, it restrains aggregation of Bi nanoparticles and serves as a buffer layer to alleviate the mechanical strain of Bi nanoparticles upon Li insertion/extraction. With these contributions, Bi@NC exhibits excellent cycling stability and rate capacity compared to bare Bi nanoparticles or their simple composites with carbon. This study provides a new approach for fabricating high volumetric energy density LIBs.", "keywords": [ "Anode", "Bi nanoparticles", "High energy density", "Lithium-ion battery", "Porous N-doped carbon" ], "authors": [ { "name": "Yaotang Zhong", "org": "1School of Chemistry and Environment, South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Bin Li", "org": "1School of Chemistry and Environment, South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Shumin Li", "org": "1School of Chemistry and Environment, South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Shuyuan Xu", "org": "1School of Chemistry and Environment, South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Zhenghui Pan", "org": "1School of Chemistry and Environment, South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Qiming Huang", "org": "2Engineering Research Center of MTEES (Ministry of Education), Research Center of BMET (Guangdong Province), Engineering Laboratory of OFMHEB (Guangdong Province), Key Laboratory of ETESPG (GHEI), and Innovative Platform for ITBMD (Guangzhou Municipality), South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Lidan Xing", "org": "2Engineering Research Center of MTEES (Ministry of Education), Research Center of BMET (Guangdong Province), Engineering Laboratory of OFMHEB (Guangdong Province), Key Laboratory of ETESPG (GHEI), and Innovative Platform for ITBMD (Guangzhou Municipality), South China Normal University, Guangzhou, 510006 People's Republic of China." }, { "name": "Chunsheng Wang", "org": "3Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, College Park, MD 20740 USA." }, { "name": "Weishan Li", "org": "2Engineering Research Center of MTEES (Ministry of Education), Research Center of BMET (Guangdong Province), Engineering Laboratory of OFMHEB (Guangdong Province), Key Laboratory of ETESPG (GHEI), and Innovative Platform for ITBMD (Guangzhou Municipality), South China Normal University, Guangzhou, 510006 People's Republic of China." } ], "venue": "Nano-micro letters", "year": 2018 }, "Q6eydDkb": { "id": "Q6eydDkb", "title": "A Pyrazine-Based Polymer for Fast-Charge Batteries.", "abstract": "The lack of high-power and stable cathodes prohibits the development of rechargeable metal (Na, Mg, Al) batteries. Herein, poly(hexaazatrinaphthalene) (PHATN), an environmentally benign, abundant and sustainable polymer, is employed as a universal cathode material for these batteries. In Na-ion batteries (NIBs), PHATN delivers a reversible capacity of 220 mAh g(-1) at 50 mA g(-1), corresponding to the energy density of 440 Wh kg(-1), and still retains 100 mAh g(-1) at 10 Ag-1 after 50 000 cycles, which is among the best performances in NIBs. Such an exceptional performance is also observed in more challenging Mg and Al batteries. PHATN retains reversible capacities of 110 mAh g(-1) after 200 cycles in Mg batteries and 92 mAh g(-1) after 100 cycles in Al batteries. DFT calculations, X-ray photoelectron spectroscopy, Raman, and FTIR show that the electron-deficient pyrazine sites in PHATN are the redox centers to reversibly react with metal ions.", "keywords": [ "fast charging", "polymer cathodes", "rechargeable Al batteries", "rechargeable Mg batteries", "sodium ion batteries" ], "authors": [ { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Minglei Mao", "org": "George Mason Univ, Dept Chem & Biochem, Fairfax, VA 22030 USA" }, { "name": "Chao Luo", "org": "US Army, Res Lab, Electrochem Branch, Power & Energy Div Sensor & Electron Devices Dire, Adelphi, MD 20783 USA" }, { "name": "Travis P Pollard", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunyu Cui", "org": "Chinese Acad Sci, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Beijing 100190, Peoples R China" }, { "name": "Jinming Yue", "org": "Chinese Acad Sci, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Beijing 100190, Peoples R China" }, { "name": "Yuxin Tong", "org": "Chinese Acad Sci, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Beijing 100190, Peoples R China" }, { "name": "Gaojing Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Deng", "org": "Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China" }, { "name": "Ming Zhang", "org": "Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China" }, { "name": "Jianmin Ma", "org": "Chinese Acad Sci, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Beijing 100190, Peoples R China" }, { "name": "Liumin Suo", "org": "US Army, Res Lab, Electrochem Branch, Power & Energy Div Sensor & Electron Devices Dire, Adelphi, MD 20783 USA" }, { "name": "Oleg Borodin", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2019 }, "h8zJnes4": { "id": "h8zJnes4", "title": "Electrochemical performance of patterned LiFePO4 nano-electrode with a pristine amorphous layer", "abstract": "", "keywords": [], "authors": [ { "name": "mao wang", "org": "" }, { "name": "wei zhang", "org": "" }, { "name": "yihang liu", "org": "" }, { "name": "yong yang", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "yuan wang", "org": "" } ], "venue": "Applied Physics Letters", "year": 2014 }, "rjhOxs7N": { "id": "rjhOxs7N", "title": "Electrochemical Performance of Porous Carbon/Tin Composite Anodes for Sodium‐Ion and Lithium‐Ion Batteries", "abstract": "The electrochemical performance of mesoporous carbon (C)/tin (Sn) anodes in Na-ion and Li-ion batteries is systematically investigated. The mesoporous C/Sn anodes in a Na-ion battery shows similar cycling stability but lower capacity and poorer rate capability than that in a Li-ion battery. The desodiation potentials of Sn anodes are approximately 0.21 V lower than delithiation potentials. The low capacity and poor rate capability of C/Sn anode in Na-ion batteries is mainly due to the large Na-ion size, resulting in slow Na-ion diffusion and large volume change of porous C/Sn composite anode during alloy/dealloy reactions. Understanding of the reaction mechanism between Sn and Na ions will provide insight towards exploring and designing new alloy-based anode materials for Na-ion batteries.", "keywords": [ "tin", "porous carbon", "anodes", "sodium-ion batteries", "energy storage" ], "authors": [ { "name": "yunhua xu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yihang liu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2013 }, "0rIxU6mN": { "id": "0rIxU6mN", "title": "Aqueous Li-ion battery enabled by halogen conversion-intercalation chemistry in graphite.", "abstract": "The use of 'water-in-salt' electrolytes has considerably expanded the electrochemical window of aqueous lithium-ion batteries to 3 to 4 volts, making it possible to couple high-voltage cathodes with low-potential graphite anodes. However, the limited lithium intercalation capacities (less than 200 milliampere-hours per gram) of typical transition-metal-oxide cathodes preclude higher energy densities. Partial or exclusive anionic redox reactions may achieve higher capacity, but at the expense of reversibility. Here we report a halogen conversion-intercalation chemistry in graphite that produces composite electrodes with a capacity of 243 milliampere-hours per gram (for the total weight of the electrode) at an average potential of 4.2 volts versus Li/Li. Experimental characterization and modelling attribute this high specific capacity to a densely packed stage-I graphite intercalation compound, C[BrCl], which can form reversibly in water-in-bisalt electrolyte. By coupling this cathode with a passivated graphite anode, we create a 4-volt-class aqueous Li-ion full cell with an energy density of 460 watt-hours per kilogram of total composite electrode and about 100 per cent Coulombic efficiency. This anion conversion-intercalation mechanism combines the high energy densities of the conversion reactions, the excellent reversibility of the intercalation mechanism and the improved safety of aqueous batteries.", "keywords": "", "authors": [ { "name": "Chongyin Yang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Travis P Pollard", "org": "Electrochemistry Branch, Power and Energy Division, Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA." }, { "name": "Xujie Lü", "org": "Center for High Pressure Science and Technology Advanced Research, Shanghai, China." }, { "name": "Cheng-Jun Sun", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA." }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Qi Liu", "org": "Department of Physics, City University of Hong Kong, Hong Kong, China." }, { "name": "Cunming Liu", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA." }, { "name": "Tingting Qing", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Yingqi Wang", "org": "Center for High Pressure Science and Technology Advanced Research, Shanghai, China." }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Power and Energy Division, Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA." }, { "name": "Yang Ren", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA." }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division, Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA." }, { "name": "Chunsheng Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, USA. cswang@umd.edu." } ], "venue": "Nature", "year": 2019 }, "vPtAUEmr": { "id": "vPtAUEmr", "title": "Spinel LiNi0.5Mn1.5O4 Cathode for High-Energy Aqueous Lithium-Ion Batteries", "abstract": "A 2.9 V intrinsic safe aqueous LiNi0.5Mn1.5O4/Mo6S8 full cell delivers 80 W h kg(-1) energy density with capacity decay of 0.075% per cycle (5 C). After the electrolyte pH value adjustment, almost full capacity of LiNi0.5Mn1.5O4 (125 mA h kg(-1)) is achieved, and 126 W h kg(-1) energy density is provided for LiNi0.5Mn1.5O4/Mo6S8 cell, representing one of the highest voltage and energy density among all the aqueous batteries.", "keywords": [ "aqueous lithium-ion batteries", "high energy density", "high voltage", "LiNi0", "5(Mn)1", "5O(4)", "water-in-salt electrolyte" ], "authors": [ { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Liumin Suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yujia Liang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Wei Sun", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2017 }, "cHL3xHlB": { "id": "cHL3xHlB", "title": "A 63 m Super-concentrated Aqueous Electrolyte for High Energy Li-ion Batteries", "abstract": "A water-in-salt electrolyte (WiSE) offers an electrochemical stability window much wider than typical aqueous electrolytes but still falls short in accommodating high-energy anode materials, mainly because of the enrichment of water molecules in the primary solvation sheath of Li+. Herein, we report a new strategy in which a non-Li cosalt was introduced to alter the Li+-solvation sheath structure. The presence of an asymmetric ammonium salt (Me3EtN center dot TFSI) in water increases the solubility of LiTFSI by two times, pushes the salt/water molar ratio from 0.37 in WiSE to an unprecedented value of 1.13, and significantly suppresses the water activity in both bulk electrolyte and the Li+-solvation sheath. This new 63 m (mol kg(solvent)(-1)) aqueous electrolyte (42 m LiTFSI + 21 m Me3EtN center dot TFSI) offers a wide potential window of 3.25 V and supports a 2.5 V aqueous Li-ion battery (LiMn2O4//Li4Ti5O12) to deliver a high energy density of 145 Wh kg(-1) stably over 150 cycles.", "keywords": "", "authors": [ { "name": "Long Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jiaxun Zhang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Qin Li", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jenel Vatamanu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Travis P. Pollard", "org": "US Army Res Lab, Electrochem Branch, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA" }, { "name": "Chunyu Cui", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Lin Ma", "org": "US Army Res Lab, Electrochem Branch, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA" }, { "name": "Michael S. Ding", "org": "US Army Res Lab, Electrochem Branch, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA" }, { "name": "Mounesha Garaga", "org": "CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA" }, { "name": "Steve Greenbaum", "org": "CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA" }, { "name": "Hung-Sui Lee", "org": "Brookhaven Natl Lab, Chem Div, Upton, NY 11973 USA" }, { "name": "Oleg Borodin", "org": "US Army Res Lab, Electrochem Branch, Sensors & Electron Devices Directorate & Joint Ct, Adelphi, MD 20783 USA" }, { "name": "Kang Xu", "org": "US Army Res Lab, Electrochem Branch, Sensors & Electron Devices Directorate & Joint Ct, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS energy letters", "year": 2020 }, "1cxiCBJt": { "id": "1cxiCBJt", "title": "High‐Performance All‐Solid‐State Lithium–Sulfur Batteries Enabled by Amorphous Sulfur‐Coated Reduced Graphene Oxide Cathodes", "abstract": "Safety and the polysulfide shuttle reaction are two major challenges for liquid electrolyte lithium-sulfur (Li-S) batteries. Although use of solid-state electrolytes can overcome these two challenges, it also brings new challenges by increasing the interface resistance and stress/strain. In this work, the interface resistance and stress/strain of sulfur cathodes are significantly reduced by conformal coating approximate to 2 nm sulfur (S) onto reduced graphene oxide (rGO). An Li-S full cell consisting of an rGO@S-Li10GeP2S12-acetylene black (AB) composite cathode is evaluated. At 60 degrees C, the all-solid-state Li-S cell demonstrates a similar electrochemical performance as in liquid organic electrolyte, with high rate capacities of 1525.6, 1384.5, 1336.3, 903.2, 502.6, and 204.7 mA h g(-1) at 0.05, 0.1, 0.5, 1.0, 2.0, and 5.0 C, respectively. It can maintain a high and reversible capacity of 830 mA h g(-1) at 1.0 C for 750 cycles. The uniform distribution of the rGO@ S nanocomposite in the Li10GeP2S12-AB matrix generates uniform volume changes during lithiation/delithiation, significantly reducing the stress/strain, thus extending the cycle life. Minimization of the stress/strain of solid cells is the key for a long cycle life of all-solid-state Li-S batteries.", "keywords": [ "lithium-sulfur batteries", "cycling stability", "reduced graphene oxide", "sulfide electrolyte", "amorphous sulfur" ], "authors": [ { "name": "Xiayin Yao", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" }, { "name": "Ning Huang", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" }, { "name": "Ning Huang", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park 20142 MD USA" }, { "name": "Qiang Zhang", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" }, { "name": "Hongli Wan", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" }, { "name": "Jean Pierre Mwizerwa", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park 20142 MD USA" }, { "name": "Xiaoxiong Xu", "org": "Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2017 }, "UZcmIVNl": { "id": "UZcmIVNl", "title": "Nano-structured carbon-coated CuO hollow spheres as stable and high rate anodes for lithium-ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "yunhua xu", "org": "university of maryland college park" }, { "name": "guoqiang jian", "org": "university of maryland college park" }, { "name": "michael r zachariah", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "Journal of Materials Chemistry", "year": 2013 }, "tjmO0rna": { "id": "tjmO0rna", "title": "Hierarchical Three-Dimensional Microbattery Electrodes Combining Bottom-Up Self-Assembly and Top-Down Micromachining", "abstract": "", "keywords": [], "authors": [ { "name": "reza ghodssi", "org": "" }, { "name": "james n culver", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "adam brown", "org": "" }, { "name": "matthew mccarthy", "org": "" }, { "name": "ekaterina pomerantseva", "org": "" }, { "name": "konstantinos gerasopoulos", "org": "" } ], "venue": "ACS Nano", "year": 2012 }, "RazbW8al": { "id": "RazbW8al", "title": "Achieving High Energy Density through Increasing the Output Voltage: A Highly Reversible 5.3 V Battery", "abstract": "Summary The energy density of current Li-ion batteries is limited by the low capacity of intercalation cathode, which leaves relatively little room to further improve because the specific capacities of these cathodes approach the theoretical levels. Increasing the cell output voltage is a possible direction to largely increase the energy density of the batteries. Extensive research has been devoted to exploring u003e5.0 V cells, but only limited advances have been achieved because of the narrow electrochemical stability window of the electrolytes ( 6 in fluoroethylene carbonate, bis(2,2,2-trifluoroethyl) carbonate, and hydrofluoroether [FEC/FDEC/HFE] with a Li difluoro(oxalate)borate [LiDFOB] additive) that enables 5.3 V LiCoMnO 4 cathodes to provide an energy density of 720 Wh kg −1 for 1,000 cycles and 5.2 V graphite||LiCoMnO 4 full cells to provide an energy density of 480 Wh kg −1 for 100 cycles. The 5.5 V electrolytes provide a large step toward developing high-energy Li batteries.", "keywords": "", "authors": [ { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Enyuan Hu", "org": "Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Jing Li", "org": "Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Dong Su", "org": "Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Xiaoqing Yang", "org": "Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" } ], "venue": "Chem", "year": 2019 }, "8aSn0qK9": { "id": "8aSn0qK9", "title": "Graphene oxide wrapped croconic acid disodium salt for sodium ion battery electrodes", "abstract": "Croconic acid disodium salt (CADS), a renewable or recyclable organic compound, is investigated as an anode material in sodium ion battery for the first time. The pristine micro-sized CADS delivers a high capacity of 246.7 mAh g-1, but it suffers from fast capacity decay during charge/discharge cycles. The detailed investigation reveals that the severe capacity loss is mainly attributed to the pulverization of CADS particles induced by the large volume change during sodiation/desodiation rather than the generally believed dissolution of CADS in the organic electrolyte. Minimizing the particle size can effectively suppress the pulverization, thus improving the cycling stability. Wrapping CADS with graphene oxide by ultrasonic spray pyrolysis can enhance the integration and conductivity of CADS electrodes, thus providing a high capacity of 293 mAh g-1. ? 2013 Elsevier B.V. All rights reserved.", "keywords": [ "croconic acid disodium salt", "graphene oxide", "particle pulverization", "sodium ion batteries", "ultrasonic spray pyrolysis" ], "authors": [ { "name": "Chao Luo", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Yujie Zhu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Yunhua Xu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Yihang Liu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Tao Gao", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Jing Wang", "org": "Jiamusi University(Jiamusi University),Jiamusi,China" }, { "name": "Chunsheng Wang", "org": "University of Maryland(University of Maryland),College Park,United States" } ], "venue": "Journal of Power Sources", "year": 2014 }, "NIYKQsfF": { "id": "NIYKQsfF", "title": "A Pomegranate-Structured Conversion-Reaction Cathode with Built-In Li Source for High Energy Li-Ion Batteries.", "abstract": "Transition metal fluorides (such as FeF3, CoF2) promise significantly higher theoretical capacities (> 571 mAh g-1) than the cathode materials currently used in Li-ion batteries. However, their practical application faces major challenges that include poor electrochemical reversibility induced by the repeated bond-breaking and formation and the accompanied volume changes, and the difficulty of building internal Li-source within the material so that a full Li-ion cell could be assembled at discharged state without inducing further technical risk and cost issues. In this work, we effectively addressed these challenges by designing and synthesizing, via an aerosol-spray pyrolysis technique, a pomegranate-structured nano-composite FeM/LiF/C (M=Co, Ni) , in which 2~3 nm carbon coated FeM-nanoparticles (~10 nm in diameter) and LiF nanoparticles (~ 20 nm) are uniformly embedded in a porous carbon sphere matrix (100~1000 nm) . This uniquely architectured nano-composite was made possible by the extremely short pyrolysis time (~ 1 s) and carbon coating in high-temperature furnace, which prevented the overgrowth of FeM and LiF in the primordial droplet that serves as carbon source. The presence of Ni or Co in FeM/LiF/C effectively suppresses the formation of Fe3C and further reduces the metallic particle size. The pomegranate-architecture ensures the intimate contact among FeM, LiF and C, thus significantly enhances the conversion-reaction kinetics, while the nano-pores inside pomegranate-like carbon matrix, left by solvent evaporation during the pyrolysis, effectively accommodate the volume change of FeM/LiF during charge/discharge. Thus, the nano-composite FeM/LiF/C shows a high specific capacity of > 300 mAh g-1 for more than 100 charge/discharge cycles, which is one of the best performances among all the pre-lithiated metal fluoride cathodes ever reported. The pomegranate-structured FeM/LiF/C with its built-in Li source provides an inspiration to the practical application of conversion-reaction type chemistries as the next generation cathode materials for the high energy density LIBs.", "keywords": [ "conversion-reaction cathode materials", "prelithiation", "transition metal fluorides", "FeF3" ], "authors": [ { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yujie Zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Liumin Suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yan Lin", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Kang Xu", "org": "US Army Res Lab, Electrochem Branch, Power & Energy Div, Sensor & Electron Devices Directorate, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2016 }, "nwgFxPOy": { "id": "nwgFxPOy", "title": "Cathode-Supported All-Solid-State Lithium-Sulfur Batteries with High Cell-Level Energy Density", "abstract": "Bulk-type all-solid-state lithium batteries (ASSLBs) are being considered as a promising technology to improve the safety and energy density of today’s batteries. However, current bulk-type ASSLBs suffer from low cell-level energy density due to the challenges in reducing the electrolyte thickness. In this work, we report cathode-supported ASSLBs with a thin solid electrolyte layer. Starting from a stainless steel mesh-supported Li2S cathode, we are able to build an ASSLB with a ∼100 μm thick Li3PS4 electrolyte reinforced by a Kevlar nonwoven scaffold and with Li metal as the anode. The ASSLB delivers a high capacity with high rate and cycling performances at room temperature. Moreover, the unique cell design also enabled utilization of a thick cathode with a Li2S loading of 7.64 mg cm–2, providing a high cell-level energy density (excluding the current collectors) of 370.6 Wh kg–1 for the first cycle.", "keywords": "", "authors": [ { "name": "Ruochen Xu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Ruochen Xu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Jie Yue", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Sufu Liu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Sufu Liu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Jiangping Tu", "org": "State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Ping Liu", "org": "Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "ACS energy letters", "year": 2019 }, "Q2A2R4s6": { "id": "Q2A2R4s6", "title": "Efficient and stable cycling of lithium metal enabled by a conductive carbon primer layer", "abstract": "Two requirements must be met for efficient and stable cycling of Li metal: (1) intimate and uniform nucleation of Li metal on an electrode substrate for constant current distribution throughout the electrode surface and (2) chemical and electrochemical stability of electrolyte components for high coulombic efficiency. With a focus on the electrode substrate, in this work, we coat a very thin and highly conductive carbon layer as the Li plating primer onto the surface of an existing Cu substrate. It is shown that the carbon primer layer greatly increases coulombic efficiency and cycling stability of Li metal. Microstructural characterization and ac-impedance analysis reveal that the improvement is due to the preferential nucleation of Li metal on the surface of carbon granules, which results in low contact resistance between the plated Li and the electrode substrate. The results of this work indicate that applying a conductive carbon primer layer is a simple and cost-effective approach for the efficient and stable cycling of Li metal.", "keywords": "", "authors": [ { "name": "Sheng S. Zhang", "org": "Electrochemistry Branch, RDRL-SED-C, Sensors and Electron Devices Directorate, U.S. Army Research Laboratory,Adelphi,USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Sustainable Energy and Fuels", "year": 2018 }, "iGEvUJZO": { "id": "iGEvUJZO", "title": "Electrochemical Techniques for Intercalation Electrode Materials in Rechargeable Batteries", "abstract": "ConspectusUnderstanding of the thermodynamic and kinetic properties of electrode materials is of great importance to develop new materials for high performance rechargeable batteries. Compared with computational understanding of physical and chemical properties of electrode materials, experimental methods provide direct and convenient evaluation of these properties. Often, the information gained from experimental work can not only offer feedback for the computational methods but also provide useful insights for improving the performance of materials. However, accurate experimental quantification of some properties can still be challenging. Among them, chemical diffusion coefficient is one representative example. It is one of the most crucial parameters determining the kinetics of intercalation compounds, which are by far the dominant electrode type used in rechargeable batteries. Therefore, it is of significance to quantitatively evaluate this parameter. For this purpose, various electrochemical technique...", "keywords": "", "authors": [ { "name": "Yujie Zhu", "org": "Beihang Univ, Sch Chem & Environm, Beijing 100191, Peoples R China" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "Accounts of Chemical Research", "year": 2017 }, "1DBA9B2H": { "id": "1DBA9B2H", "title": "Epitaxial Welding of Carbon Nanotube Networks for Aqueous Battery Current Collectors.", "abstract": "Carbon nanomaterials are desirable candidates for lightweight, highly conductive, and corrosion-resistant current collectors. However, a key obstacle is their weak interconnection between adjacent nanostructures, which renders orders of magnitude lower electrical conductivity and mechanical strength in the bulk assemblies. Here we report an \"epitaxial welding\" strategy to engineer carbon nanotubes (CNTs) into highly crystalline and interconnected structures. Solution-based polyacrylonitrile was conformally coated on CNTs as \"nano-glue\" to physically join CNTs into a network, followed by a rapid high temperature annealing (>2800 K, overall ~30 mins) to graphitize the polymer coating into crystalline layers that also bridge the adjacent CNTs to form an interconnected structure. The contact-welded CNTs (W-CNTs) exhibit both a high conductivity (~1500 S/cm) and a high tensile strength (~120 MPa), which are 5 and 20 times higher than the un-welded CNTs, respectively. In addition, the W-CNTs display chemical and electrochemical stabilities in strong acidic/alkaline electrolytes (>6 mol/L) when potentiostatically stressing at both cathodic and anodic potentials. With these exceptional properties, the W-CNT films are optimal as high-performance current collectors and were demonstrated in the state-of-the-art aqueous battery using a \"water-in-salt\" electrolyte.", "keywords": [ "current collector", "contact welding", "high temperature", "epitaxial growth", "aqueous battery" ], "authors": [ { "name": "Yonggang Yao", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Feng Jiang", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Kun Kelvin Fu", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "John Hayden", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Chuan-Fu Lin", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Hua Xie", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Miaolun Jiao", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Chunpeng Yang", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Yilin Wang", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Shuaiming He", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Fujun Xu", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Emily Hitz", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Tingting Gao", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Jiaqi Dai", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Wei Luo", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Gary Rubloff", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Liangbing Hu", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "ACS nano", "year": 2018 }, "njn9stWt": { "id": "njn9stWt", "title": "A chemically stabilized sulfur cathode for lean electrolyte lithium sulfur batteries.", "abstract": "Lithium sulfur batteries (LSBs) are promising next-generation rechargeable batteries due to the high gravimetric energy, low cost, abundance, nontoxicity, and high sustainability of sulfur. However, the dissolution of high-order polysulfide in electrolytes and low Coulombic efficiency of Li anode require excess electrolytes and Li metal, which significantly reduce the energy density of LSBs. Quasi-solid-state LSBs, where sulfur is encapsulated in the micropores of carbon matrix and sealed by solid electrolyte interphase, can operate under lean electrolyte conditions, but a low sulfur loading in carbon matrix (<40 wt %) and low sulfur unitization (<70%) still limit the energy density in a cell level. Here, we significantly increase the sulfur loading in carbon to 60 wt % and sulfur utilization to ∼87% by dispersing sulfur in an oxygen-rich dense carbon host at a molecular level through strong chemical interactions of C-S and O-S. In an all-fluorinated organic lean electrolyte, the C/S cathode experiences a solid-state lithiation/delithiation reaction after the formation of solid electrolyte interphase in the first deep lithiation, completely avoiding the shuttle reaction. The chemically stabilized C/S composite retains a high reversible capacity of 541 mAh⋅g (based on the total weight of the C/S composite) for 200 cycles under lean electrolyte conditions, corresponding to a high energy density of 974 Wh⋅kg The superior electrochemical performance of the chemical bonding-stabilized C/S composite renders it a promising cathode material for high-energy and long-cycle-life LSBs.", "keywords": [ "carbon", "chemical bonding", "lean electrolyte", "lithium sulfur batteries", "oxygen" ], "authors": [ { "name": "Chao Luo", "org": "Department of Chemistry and Biochemistry, George Mason University, Fairfax, VA 22030." }, { "name": "Enyuan Hu", "org": "Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973." }, { "name": "Karen J Gaskell", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742." }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Tao Gao", "org": "Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139." }, { "name": "Chunyu Cui", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Sanjit Ghose", "org": "National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973." }, { "name": "Xiao-Qing Yang", "org": "Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973." }, { "name": "Chunsheng Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742." } ], "venue": "Proceedings of the National Academy of Sciences of the United States of America", "year": 2020 }, "07aPKvDC": { "id": "07aPKvDC", "title": "A rechargeable aqueous Zn2+-battery with high power density and a long cycle-life", "abstract": "Li-Ion batteries (LIBs) are approaching their energy limits imposed by their intercalation chemistry nature. As alternatives, multivalent (MV) chemistries bring both promises and challenges, with the main obstacle being the sluggish diffusion of MV-cations due to their strong electrostatic interaction with host lattices. In this work, we demonstrated that polyanion based robust crystal architecture could enable ultrafast and reversible Zn2+-intercalation and de-intercalation at a high working voltage. The nominal bivalence of Zn2+ was successfully delocalized by multiple atoms through the p–d hybridization between the V-d and O-p orbitals; hence the inserted Zn2+ only bears an effective charge of 1.336, rendering its high mobility. The novel aqueous rechargeable 1.7 V Zn/LiV2(PO4)3 cell based on such a mechanism delivers a high power density (8000 W kg−1 at 60C) comparable to supercapacitors, and a high energy density (218 W h kg−1 at 1C) close to LIBs, with an extraordinarily long cycle life of 4000 cycles. All of these parameters far exceed those of Zn batteries reported so far. The cell-level volumetric and specific energy densities of the Zn/LiV2(PO4)3 cell are 320 W h L−1 and 150 W h kg−1, respectively, which are even better than those of first-generation LIBs. Combined with the intrinsic safety of its aqueous chemistry and its wide working temperature range, this cell makes a strong candidate for automotive applications.", "keywords": "", "authors": [ { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Enyuan Hu", "org": "Chemistry Division, Brookhaven National Laboratory,Upton,USA" }, { "name": "Wei Sun", "org": "" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiao-Qing Yang", "org": "Chemistry Division, Brookhaven National Laboratory,Upton,USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory,Adelphi,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Energy and Environmental Science", "year": 2018 }, "10OZenhX": { "id": "10OZenhX", "title": "Virus-enabled silicon anode for lithium-ion batteries.", "abstract": "A novel three-dimensional Tobacco mosaic virus assembled silicon anode is reported. This electrode combines genetically modified virus templates for the production of high aspect ratio nanofeatured surfaces with electroless deposition to produce an integrated nickel current collector followed by physical vapor deposition of a silicon layer to form a high capacity silicon anode. This composite silicon anode produced high capacities (3300 mAh/g), excellent charge-discharge cycling stability (0.20% loss per cycle at 1C), and consistent rate capabilities (46.4% at 4C) between 0 and 1.5 V. The biological templated nanocomposite electrode architecture displays a nearly 10-fold increase in capacity over currently available graphite anodes with remarkable cycling stability.", "keywords": [ "silicon anode", "lithium-ion battery", "Tobacco mosaic virus", "physical vapor deposition", "nanostructure" ], "authors": [ { "name": "Xilin Chen", "org": "Univ Maryland, Inst Biotechnol, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Konstantinos Gerasopoulos", "org": "Univ Maryland, Inst Biotechnol, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Juchen Guo", "org": "Univ Maryland, Inst Biotechnol, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Adam Brown", "org": "Univ Maryland, Inst Biotechnol, Ctr Biosyst Res, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Inst Biotechnol, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Reza Ghodssi", "org": "Univ Maryland, Inst Biotechnol, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "James N Culver", "org": "Univ Maryland, Inst Biotechnol, Ctr Biosyst Res, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2010 }, "aNe14o4J": { "id": "aNe14o4J", "title": "Reversible S 0 /MgS x Redox Chemistry in a MgTFSI 2 /MgCl 2 /DME Electrolyte for Rechargeable Mg/S Batteries.", "abstract": "The redox chemistry of magnesium and its application in rechargeable Mg batteries has received increasing attention owing to the unique benefits of Mg metal electrodes, namely high reversibility without dendrite formation, low reduction potentials, and high specific capacities. The Mg/S couple is of particular interest owing to its high energy density and low cost. Previous reports have confirmed the feasibility of a rechargeable Mg/S battery; however, only limited cycling stability was achieved, and the complicated procedure for the preparation of the electrolytes has significantly compromised the benefits of Mg/S chemistry and hindered the development of Mg/S batteries. Herein, we report the development of the first rechargeable Mg/S battery with a MgTFSI2/MgCl2/DME electrolyte (DME=1,2-dimethoxyethane, TFSI=bis(trifluoromethanesulfonyl)imide) and realize the best cycling stability among all reported Mg/S batteries by suppressing polysulfide dissolution. Mechanistic studies show that the battery works via S-0/MgSx redox processes and that the large voltage hysteresis is mainly due to the Mg anode overpotential.", "keywords": [ "batteries", "electrochemistry", "magnesium", "polysulfide", "sulfur" ], "authors": [ { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Zhaohui Ma", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Xiaogang Li", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Kang Xu", "org": "US Army Res Lab, Power & Energy Div Sensor & Elect Devices Directo, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2017 }, "OUUEZXpq": { "id": "OUUEZXpq", "title": "How Water Accelerates Bivalent Ion Diffusion at the Electrolyte/Electrode Interface", "abstract": "", "keywords": "", "authors": [ { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park MD 20740 USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park MD 20740 USA" }, { "name": "Wei Sun", "org": "" }, { "name": "Zulipiya Shadike", "org": "Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA" }, { "name": "Enyuan Hu", "org": "" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park MD 20740 USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park MD 20740 USA" }, { "name": "Xiao-Qing Yang", "org": "Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate Power and Energy Division U.S. Army Research Laboratory Adelphi MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park MD 20740 USA" } ], "venue": "Angewandte Chemie", "year": 2018 }, "0LygSLYD": { "id": "0LygSLYD", "title": "Electrochemical Intercalation of Potassium into Graphite", "abstract": "Exceptional cycling performance of graphite anode in K-ion batteries is demonstrated with a reversible capacity of 246 mAh g(-1) and 89% retention of the initial capacity after 200 cycles. Although the graphite anode experiences huge volume change and worse kinetics during K intercalation/deintercalation, the cycling stability delivered in K-ion batteries is comparable to that of Li-ion batteries using the same graphite anode. The combination of excellent electrochemical performance, the abundance and wide availability of K in earth's crust, and the well-developed technology of the graphite anode make the K-ion battery very attractive for offering a low cost battery chemistry for large-scale energy storage applications.", "keywords": "", "authors": [ { "name": "Jin Zhao", "org": "Tianjin Univ, Sch Mat Sci, Tianjin 300072, Peoples R China" }, { "name": "Xiaoxi Zou", "org": "Wuhan Inst Technol, Sch Mat Sci & Engn, Wuhan 430073, Peoples R China" }, { "name": "Yujie Zhu", "org": "Beihang Univ, Sch Chem & Environm, Beijing 100191, Peoples R China" }, { "name": "Yunhua Xu", "org": "Tianjin Univ, Sch Mat Sci, Tianjin 300072, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2016 }, "1ZHOrnWZ": { "id": "1ZHOrnWZ", "title": "ChemInform Abstract: A Battery Made from a Single Material.", "abstract": "", "keywords": [], "authors": [ { "name": "fudong han", "org": "" }, { "name": "tao gao", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "karen j gaskell", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Cheminform", "year": 2015 }, "i13ZkxFV": { "id": "i13ZkxFV", "title": "Hierarchical Three-Dimensional Microbattery Electrodes Combining Bottom-Up Self-Assembly and", "abstract": "", "keywords": [], "authors": [ { "name": "konstantinos gerasopoulos", "org": "" }, { "name": "ekaterina pomerantseva", "org": "" }, { "name": "matthew mccarthy", "org": "" }, { "name": "adam brown", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "james n culver", "org": "" }, { "name": "reza ghodssi", "org": "" } ], "venue": "", "year": 2012 }, "I2bf3cL4": { "id": "I2bf3cL4", "title": "Nanostructured Metal Oxides for Li-Ion Batteries", "abstract": "", "keywords": [], "authors": [ { "name": "juchen guo", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "", "year": 2012 }, "YrsOla28": { "id": "YrsOla28", "title": "Superior Stable Self‐Healing SnP3 Anode for Sodium‐Ion Batteries", "abstract": "", "keywords": [ "anode material", "self-healing", "SnP3", "sodium-ion batteries" ], "authors": [ { "name": "xiulin fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "jianfeng mao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "liumin suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "tao gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "fudong han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "szchian liou", "org": "Univ Maryland, Maryland Nanoctr, College Pk, MD 20742 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2015 }, "LsHBKlt9": { "id": "LsHBKlt9", "title": "Virus-assembled flexible electrode-electrolyte interfaces for enhanced polymer-based battery applications", "abstract": "High-aspect-ratio cobalt-oxide-coated Tobacco mosaic virus (TMV-) assembled polytetrafluoroethylene (PTFE) nonstick surfaces were integrated with a solvent-free polymer electrolyte to create an anode-electrolyte interface for use in lithium-ion batteries. The virus-assembled PTFE surfaces consisted primarily of cobalt oxide and were readily intercalated with a low-molecular-weight poly (ethylene oxide) (PEO) based diblock copolymer electrolyte to produce a solid anode-electrolyte system. The resulting polymercoated virus-based system was then peeled from the PTFE backing to produce a flexible electrode-electrolyte component. Electrochemical studies indicated the virus-structured metal-oxide PEO-based interface was stable and displayed robust charge transfer kinetics. Combined, these studies demonstrate the development of a novel solid-state electrode architecture with a unique peelable and flexible processing attribute.", "keywords": [ "ethylene oxide", "flexible processing attribute", "diblock copolymer electrolyte", "ptfe backing", "enhanced polymer-based battery application", "anode-electrolyte interface", "solid anode-electrolyte system", "cobalt oxide", "flexible electrode-electrolyte component", "polymercoated virus-based system", "virus-assembled flexible electrode-electrolyte interface", "virus-assembled ptfe surface" ], "authors": [ { "name": "Ayan Ghosh", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD" }, { "name": "Juchen Guo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD" }, { "name": "Adam D. Brown", "org": "Institute for Bioscience and Biotechology Research, University of Maryland, College Park, MD" }, { "name": "Elizabeth Royston", "org": "Institute for Bioscience and Biotechology Research, University of Maryland, College Park, MD" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD" }, { "name": "Peter Kofinas", "org": "Fischell Department of Bioengineering, University of Maryland, College Park, MD" }, { "name": "James N. Culver", "org": "Institute for Bioscience and Biotechology Research and Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD" } ], "venue": "Journal of Nanomaterials - Special issue on Nanomaterials for Energy Conversion and Storage", "year": 2012 }, "D8dUzNX1": { "id": "D8dUzNX1", "title": "“Water-in-Salt” electrolytes enable green and safe Li-ion batteries for large scale electric energy storage applications", "abstract": "Although state-of-the-art Li-ion batteries have overwhelmed the market of portable electronics as the main power source, their intrinsic limitations imposed by concerns over their safety, toxicity and cost have prevented them from being readily adopted by large-scale electric energy storage applications. Leveraging the new class of aqueous electrolytes of wide electrochemical stability window to resolve these concerns, we describe a new aqueous Li-ion chemistry based on LiFePO4/water-in-salt/Mo6S8 that is safe, green and economical. These merits, along with superior electrochemical performances such as excellent cycling stability (u003e1000 cycles), both high coulombic and round-trip efficiencies, high rate capability, low self-discharge rate at the fully charged state, as well as a wide service temperature range (−20 to +55 °C), make this new battery chemistry a promising candidate in energy storage units for large-scale applications.", "keywords": "", "authors": [ { "name": "Liumin Suo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park,,USA" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park,,USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park,,USA" }, { "name": "Huili Liu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park,,USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division U.S. Army Research Laboratory Adelphi,,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park,,USA" } ], "venue": "Journal of Materials Chemistry", "year": 2016 }, "ZzdUx3rU": { "id": "ZzdUx3rU", "title": "An Organic Anode for High Temperature Potassium‐Ion Batteries", "abstract": "The wide applications of rechargeable batteries require state-of-the-art batteries that are sustainable (abundant resource), tolerant to high-temperature operations, and excellent in delivering high capacity and long-term cycling life. Due to the scarcity and uneven distribution of lithium, it is urgent to develop alternative rechargeable batteries. Herein, an organic compound, azobenzene-4,4'-dicarboxylic acid potassium salts (ADAPTS) is developed, with an azo group as the redox center for high performance potassium-ion batteries (KIBs). The extended pi-conjugated structure in ADAPTS and surface reactions between ADAPTS and K-ions enable the stable charge/discharge of K-ion batteries even at high temperatures up to 60 degrees C. When operated at 50 degrees C, ADAPTS anode delivers a reversible capacity of 109 mAh g(-1) at 1C for 400 cycles. A reversible capacity of 77 mAh g(-1) is retained at 2C for 1000 cycles. At 60 degrees C, the ADAPTS-based KIBs deliver a high capacity of 113 mAh g(-1) with 81% capacity retention at 2C after 80 cycles. The exceptional electrochemical performance demonstrates that ADAPTS is a promising electrode material for high-temperature KIBs.", "keywords": [ "azo compounds", "conjugated structure", "EELS", "high temperature", "potassium-ion batteries" ], "authors": [ { "name": "Yujia Liang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Sz‐Chian Liou", "org": "AIM Lab NanoCenter University of Maryland College Park MD 20742 USA" }, { "name": "Tingting Qing", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Qin Li", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Chunyu Cui", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2019 }, "drLajuTV": { "id": "drLajuTV", "title": "Advanced High‐Voltage Aqueous Lithium‐Ion Battery Enabled by “Water‐in‐Bisalt” Electrolyte", "abstract": "A new super-concentrated aqueous electrolyte is proposed by introducing a second lithium salt. The resultant ultra-high concentration of 28 m led to more effective formation of a protective interphase on the anode along with further suppression of water activities at both anode and cathode surfaces. The improved electrochemical stability allows the use of TiO2 as the anode material, and a 2.5 Vaqueous Li-ion cell based on LiMn2O4 and carbon-coated TiO2 delivered the unprecedented energy density of 100 Wh kg(-1) for rechargeable aqueous Li-ion cells, along with excellent cycling stability and high coulombic efficiency. It has been demonstrated that the introduction of a second salts into the \"water-in-salt\" electrolyte further pushed the energy densities of aqueous Li-ion cells closer to those of the state-of-the-art Li-ion batteries.", "keywords": [ "anatase TiO2", "aqueous batteries", "electrolyte", "lithium-ion batteries", "water-in-bisalt" ], "authors": [ { "name": "Liumin Suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Oleg Borodin", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Wei Sun", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Zhaohui Ma", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Marshall Schroeder", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Arthur von Cresce", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Selena M. Russell", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Michel Armand", "org": "IC Energigune, Alava Technol Pk, Minano, Alava, Spain" }, { "name": "Austen Angell", "org": "Arizona State Univ, Sch Mol Sci, Tempe, AZ 85287 USA" }, { "name": "Kang Xu", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2016 }, "AdM3ZM2o": { "id": "AdM3ZM2o", "title": "Integrating Multiredox Centers into One Framework for High-Performance Organic Li-Ion Battery Cathodes", "abstract": "Organic cathode materials are promising for developing high-energy and high-power Li-ion batteries (LIBs). However, the energy storage of most organic cathodes relies on the electron transfer of a single type of functional group, leading to either a low redox potential or a low capacity. Here we propose a new strategy for the structure design and performance optimization of organic materials. A new organic cathode, dithianon (DTN), containing three functional groups (−S–, C═O, C≡N) in one framework, is reported. The −S– group increases the redox potential to 3.0 V, while C═O and C≡N groups enable a three Li-ions-involved redox reaction. As a cathode, DTN delivers 270.2 mAh g–1 at 0.5C for 300 cycles. Even at 5C, it still retains 161.5 mAh g–1 after 1000 cycles. The high-capacity, high-power, and stable DTN cathode offers great promise for high-performance and sustainable LIBs.", "keywords": "", "authors": [ { "name": "Chunyu Cui", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiao Ji", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Peng-Fei Wang", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Gui-Liang Xu", "org": "Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States" }, { "name": "Long Chen", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Ji Chen", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Hacksung Kim", "org": "Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States" }, { "name": "Yang Ren", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States" }, { "name": "Fu Chen", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Chongyin Yang", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Chao Luo", "org": "Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030, United States" }, { "name": "Khalil Amine", "org": "Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "ACS energy letters", "year": 2020 }, "HUOETkTT": { "id": "HUOETkTT", "title": "A Covalent Organic Framework for Fast-Charge and Durable Rechargeable Mg Storage.", "abstract": "High safety, low cost and high volumetric capacity rechargeable magnesium batteries (RMBs) are promising alternatives to lithium ion batteries. However, lack of high power, high energy and stable cathodes for RMBs hinders their commercialization. Herein, an environmentally benign, low cost and sustainable covalent organic framework (COF) cathode for Mg storage is reported for the first time. It delivers a high power density of 2.8 kW kg-1, a high specific energy density of 146 Wh kg-1, and ultra-long cycle life of 3000 cycles with very slow capacity decay rate of 0.0196% per cycle, representing one of the best cathodes to date. The comprehensive electrochemical analysis proves that triazine ring sites in COF are redox centers for reversible reaction with magnesium ions, and the ultra-fast reaction kinetic is mainly attributed to pseudocapacitive behavior. The high-rate Mg storage of COF offers new opportunities for the development of ultra-stable and fast charge RMBs.", "keywords": "", "authors": [ { "name": "Ruimin Sun", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Chao Luo", "org": "Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030, United States." }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Luning Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Liqiang Mai", "org": "State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." } ], "venue": "Nano letters", "year": 2020 }, "3aXmaSBP": { "id": "3aXmaSBP", "title": "Lithium–tellurium batteries based on tellurium/porous carbon composite", "abstract": "", "keywords": [], "authors": [ { "name": "ying liu", "org": "university of maryland college park" }, { "name": "jiangwei wang", "org": "university of pittsburgh" }, { "name": "yunhua xu", "org": "university of maryland college park" }, { "name": "yujie zhu", "org": "university of maryland college park" }, { "name": "david i bigio", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "Journal of Materials Chemistry", "year": 2014 }, "mhlIRKmQ": { "id": "mhlIRKmQ", "title": "Carbonized Polyacrylonitrile‐Stabilized SeSx Cathodes for Long Cycle Life and High Power Density Lithium Ion Batteries", "abstract": "A facile synthesis of selenium sulfide (SeSx)/carbonized polyacrylonitrile (CPAN) composites is achieved by annealing the mixture of SeS2 and polyacrylonitrile (PAN) at 600 degrees C under vacuum. The SeSx molecules are confined by N-containing carbon (ring) structures in the carbonized PAN to mitigate the dissolution of polysulfide and polyselenide intermediates in carbonate-based electrolyte. In addition, formation of solid electrolyte interphase (SEI) on the surface of SeSx/CPAN electrode in the first cycle further prevents polysulfi de and polyselenide intermediates from dissolution. The synergic restriction of SeSx by both CPAN matrix and SEI layer allows SeSx/CPAN composites to be charged and discharged in a low-cost carbonate-based electrolyte (LiPF 6 in EC/DEC) with long cycling stability and high rate capability. At a current density of 600 mA g(-1), it maintains a reversible capacity of 780 mAh g(-1) for 1200 cycles. Moreover, it retains 50% of the capacity at 60 mA g(-1) even when the current density increases to 6 A g(-1). The superior electrochemical performance of SeSx /CPAN composite demonstrates that it is a promising cathode material for long cycle life and high power density lithium ion batteries. This is the first report on long cycling stability and high rate capability of selenium sulfide-based cathode material.", "keywords": [ "cathodes" ], "authors": [ { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yang wen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "jingjing wang", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2014 }, "yJopuT8w": { "id": "yJopuT8w", "title": "In-Situ Analytical Transmission Electron Microscopy Study of Electrochemical Lithiation of a Sulfur - Carbon Nanotube Composite Cathode", "abstract": "", "keywords": [], "authors": [ { "name": "jeremy ticey", "org": "university of maryland college park" }, { "name": "vladimir p oleshko", "org": "university of maryland college park" }, { "name": "yujie zhu", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "john cumings", "org": "university of maryland college park" } ], "venue": "Microscopy and Microanalysis", "year": 2015 }, "lQUVOIJd": { "id": "lQUVOIJd", "title": "A tin-plated copper substrate for efficient cycling of lithium metal in an anode-free rechargeable lithium battery", "abstract": "Abstract Adhesion of Li plating to electrode substrate and chemical stability of plated Li against electrolyte components are two essential factors affecting the cycling performance of Li metal in a rechargeable Li battery. Poor adhesion results in high contact resistance and further the formation of dead Li. Aiming to improve the adhesion of Li plating to Cu substrate, we plate a very thin tin layer as the primer for Li plating on the Cu substrate. By this way, Li metal is first reacted with tin to form a Li-Sn alloy, and then Li is cycled on resultant Li-Sn alloy so that the Li-Sn alloy functions as an “electric glue” to electrically connect the Li plating and Cu substrate. Attributed to the strong affinity between Li and Li-Sn alloy, the pre-plated tin layer is shown not only to enhance the adhesion of the plated Li to electrode substrate but also to improve the morphology of Li plating. Using a 1.0 m (molality) LiPF 6 1:4 (wt.) fluoroethylene carbonate/ethylmethyl carbonate electrolyte, in this paper the effect of the tin primer layer on the Li cycling performance in a Li/Cu cell and a Cu/LiNi 0.85 Co 0.10 Al 0.05 O 2 cell is demonstrated and discussed.", "keywords": "", "authors": [ { "name": "Sheng S. Zhang", "org": "Electrochemistry Branch, RDRL-SED-C, Sensors and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD 20783-1138, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" } ], "venue": "Electrochimica Acta", "year": 2017 }, "6nuXTqj6": { "id": "6nuXTqj6", "title": "In situ lithiated FeF 3 /C nanocomposite as high energy conversion-reaction cathode for lithium-ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "xiulin fan", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "chao luo", "org": "" }, { "name": "tao gao", "org": "" }, { "name": "liumin suo", "org": "" }, { "name": "szchian liou", "org": "" }, { "name": "kang xu", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Journal of Power Sources", "year": 2016 }, "qHgmhOel": { "id": "qHgmhOel", "title": "A Rechargeable Al/S Battery with an Ionic‐Liquid Electrolyte", "abstract": "Aluminum metal is a promising anode material for next generation rechargeable batteries owing to its abundance, potentially dendrite-free deposition, and high capacity. The rechargeable aluminum/sulfur (Al/S) battery is of great interest owing to its high energy density (1340 Wh kg(-1)) and low cost. However, Al/S chemistry suffers poor reversibility owing to the difficulty of oxidizing AlSx. Herein, we demonstrate the first reversible Al/S battery in ionic-liquid electrolyte with an activated carbon cloth/sulfur composite cathode. Electrochemical, spectroscopic, and microscopic results suggest that sulfur undergoes a solid-state conversion reaction in the electrolyte. Kinetics analysis identifies that the slow solid-state sulfur conversion reaction causes large voltage hysteresis and limits the energy efficiency of the system.", "keywords": [ "aluminum/sulfur batteries", "electrochemistry", "ionic liquids", "solid-state reactions", "sulfur" ], "authors": [ { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Xiaogang Li", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Xiwen Wang", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Junkai Hu", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20740 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Liumin Suo", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" }, { "name": "Alex J Pearse", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20740 USA" }, { "name": "Sang Bok Lee", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20740 USA" }, { "name": "Gary W. Rubloff", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20740 USA" }, { "name": "Karen J Gaskell", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20740 USA" }, { "name": "Malachi Noked", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20740 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Bimol Engn, College Pk, MD 20740 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2016 }, "DL7ltaVQ": { "id": "DL7ltaVQ", "title": "Uncharted Waters: Super-Concentrated Electrolytes", "abstract": "Summary As a legacy left behind by classical analytical electrochemistry in pursuit of ideal electrodics, and classical physical electrochemistry in pursuit of the most conductive ionics, the study of non-aqueous electrolytes has been historically confined within a narrow concentration regime around 1 molarity (M). This confinement was breached in recent years when unusual properties were found to arise from the excessive salt presence, which often bring benefits to electrochemical, thermal, transport, interfacial, and interphasial properties that are of significant interest to the electrochemical energy storage community. This article provides an overview on this newly discovered and under-explored realm, with emphasis placed on their applications in rechargeable batteries.", "keywords": "", "authors": [ { "name": "Oleg Borodin", "org": "Joint Center for Energy Storage Research, U.S. Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Julian Self", "org": "Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA" }, { "name": "Kristin A. Persson", "org": "Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Kang Xu", "org": "Joint Center for Energy Storage Research, U.S. Army Research Laboratory, Adelphi, MD 20783, USA" } ], "venue": "Joule", "year": 2020 }, "XVYNDmUf": { "id": "XVYNDmUf", "title": "Self-templated Formation of P2-type K0.6CoO2 Microspheres for High Reversible Potassium-ion Batteries.", "abstract": "Layered metal oxides have been widely used as the best cathode materials for commercial lithium-ion batteries and are being intensively explored for sodium-ion batteries. However, their application to potassium-ion batteries (PIBs) is hampered because of the poor cycling stability and low rate capability due to the larger ionic size of K+ than of Li+ or Na+. Herein, a facile self-templated strategy was used to synthesize unique P2-type K0.6CoO2 microspheres that consist of aggregated primary nanoplates as PIB cathodes. The unique K0.6CoO2 microspheres with aggregated structure significantly enhanced the kinetics of the K+ intercalation/deintercation and also minimized the parasitic reactions between the electrolyte and K0.6CoO2. The P2-K0.6CoO2 microspheres demonstrated a high reversible capacity of 82 mAh g-1 at 10 mA g-1, high rate capability of 65 mAh g-1 at 100 mA g-1, and long cycle life (87% capacity retention over 300 cycles). The high reversibility of the P2-K0.6CoO2 full cell paired with a hard carbon anode further demonstrated the feasibility of PIBs. This work not only successfully demonstrates exceptional performance of P2-type K0.6CoO2 cathodes and microspheres K0.6CoO2||Hard carbon full cells, but also provides new insights into the exploration of other layered metal oxides for PIBs.", "keywords": "", "authors": [ { "name": "Tao Deng", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Chao Luo", "org": "" }, { "name": "Ji Chen", "org": "" }, { "name": "Long Chen", "org": "" }, { "name": "Singyuk Hou", "org": "" }, { "name": "Nico Eidson", "org": "" }, { "name": "Xiuquan Zhou", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano letters", "year": 2018 }, "ZK2DIItZ": { "id": "ZK2DIItZ", "title": "Hollow porous nanoparticles with Pt skin on a Ag–Pt alloy structure as a highly active electrocatalyst for the oxygen reduction reaction", "abstract": "Aiming to reduce the dosage of the noble metal Pt and improve the catalytic activity of the catalyst in fuel cells, hollow porous Ag–Pt alloy nanoparticles with Pt coating are prepared via a facile controlled galvanic replacement reaction. Ag is used as the substrate to build a hollow porous structure and alloyed with Pt to minimize the tensile effect of the Ag on the deposited Pt skin which would significantly lower the catalytic performance of the Ag–Pt bimetallic catalyst. This hollow porous Ag/Pt bimetallic catalyst exhibits a long catalytic durability and a mass activity of 0.438 A mgPt−1 at 0.9 V (vs. RHE) towards the oxygen reduction reaction (ORR), which is ca. 3 times higher than that of the commercial Pt/C catalyst. The significant enhancement over the state-of-the-art Pt catalysts can be attributed to (1) the high surface area of the nanoparticles, (2) the more suitable d-band center of the Pt skin deposited on the Ag–Pt alloy substrate, and (3) the high thermal stability of the Ag–Pt alloy. Therefore, this work provides a new strategy for designing high-performance catalysts with low cost. In addition, the synthetic chemistry involved can possibly be extended for fabricating versatile catalysts with a similar structure.", "keywords": "", "authors": [ { "name": "Tao Fu", "org": "State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University,Xiamen,P. R. China" }, { "name": "Jun Fang", "org": "Department of Chemical & Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University,Xiamen,P. R. China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Jinbao Zhao", "org": "State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University,Xiamen,P. R. China" } ], "venue": "Journal of Materials Chemistry", "year": 2016 }, "nNZV7R9z": { "id": "nNZV7R9z", "title": "Tin-coated viral nanoforests as sodium-ion battery anodes.", "abstract": "Designed as a high-capacity alloy host for Na-ion chemistry, a forest of Sn nanorods with a unique core-shell structure was synthesized on viral scaffolds, which were genetically engineered to ensure a nearly vertical alignment upon self-assembly onto a metal substrate. The interdigital spaces thus formed between individual rods effectively accommodated the volume expansion and contraction of the alloy upon sodiation/desodiation, while additional carbon-coating engineered over these nanorods further suppressed Sn aggregation during extended electrochemical cycling. Due to the unique nanohierarchy of multiple functional layers, the resultant 3D nanoforest of C/Sn/Ni/TMV1cys, binder-free composite electrode already and evenly assembled on a stainless steel current collector, exhibited supreme capacity utilization and cycling stability toward Na-ion storage and release. An initial capacity of 722 mA·h (g Sn)(-1) along with 405 mA·h (g Sn)(-1) retained after 150 deep cycles demonstrates the longest-cycling nano-Sn anode material for Na-ion batteries reported in the literature to date and marks a significant performance improvement for neat Sn material as alloy host for Na-ion chemistry.", "keywords": [ "Na-ion batteries", "Sn nanoforest anodes", "nanohierarchy", "tobacco mosaic virus", "physical vapor deposition", "magnetron sputtering" ], "authors": [ { "name": "Yihang Liu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Yunhua Xu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yujie Zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "James N Culver", "org": "Univ Maryland, Inst Biosci & Biotechnol Res, College Pk, MD 20742 USA" }, { "name": "Cynthia A Lundgren", "org": "USA, Electrochem Branch, Res Lab, Adelphi, MD 20783 USA" }, { "name": "Kang Xu", "org": "USA, Electrochem Branch, Res Lab, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2013 }, "6OVvOifv": { "id": "6OVvOifv", "title": "Selenium@mesoporous carbon composite with superior lithium and sodium storage capacity.", "abstract": "Selenium-impregnated carbon composites were synthesized by infusing Se into mesoporous carbon at a temperature of 600 °C under vacuum. Ring-structured Se8 was produced and confined in the mesoporous carbon, which acts as an electronic conductive matrix. During the electrochemical process in low-cost LiPF6/EC/DEC electrolyte, low-order polyselenide intermediates formed and were stabilized by mesoporous carbon, which avoided the shuttle reaction of polyselenides. Exceptional electrochemical performance of Se/mesoporous carbon composites was demonstrated in both Li-ion and Na-ion batteries. In lithium-ion batteries, Se8/mesoporous carbon composite cathodes delivered a reversible capacity of 480 mAh g(-1) for 1000 charge/discharge cycles without any capacity loss, while in Na-ion batteries, it provided initial capacity of 485 mAh g(-1) and retained 340 mAh g(-1) after 380 cycles. The Se8/mesoporous carbon composites also showed excellent rate capability. As the current density increased from 0.1 to 5 C, the capacity retained about 46% in Li-ion batteries and 34% in Na-ion batteries.", "keywords": [ "selenium cathode", "mesoporous carbon", "lithium-ion batteries", "sodium-ion batteries", "polyselenides", "shuttle effect" ], "authors": [ { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland , College Park, Maryland 20742, United States." }, { "name": "Yunhua Xu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yujie Zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yihang Liu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Shiyou Zheng", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ying Liu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Alex Langrock", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2013 }, "524ghas6": { "id": "524ghas6", "title": "Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive", "abstract": "Aqueous lithium ion batteries (ALIBs) receive increasing attention due to their intrinsic non-flammable nature. Their practical application, however, has been prevented by the poor electrochemical stability of aqueous electrolytes, which severely restricts the choice of anode and cathode materials for such batteries and leads to low energy densities. It has been demonstrated that “water-in-salt” electrolytes can provide an expanded voltage window of ∼3.0 V, which can accommodate electrode materials that were otherwise forbidden in conventional aqueous electrolytes. In this study, we showed that the presence of an additive could further stabilize the aqueous electrolyte at a high voltage cathode surface. By forming a cathode electrolyte interphase (CEI) through electrochemical oxidation of tris(trimethylsilyl) borate (TMSB), we successfully stabilized LiCoO2 in water-in-salt electrolyte at a high cut-off voltage that corresponds to 0.7e electron charge transfer. To the best of our knowledge, this is also the first electrolyte additive known to form an interphase in aqueous electrolytes. The formed CEI significantly suppressed electrolyte oxidation as well as cobalt dissolution from LiCoO2 into electrolytes, allowing LiCoO2 to be stably charged/discharged at a higher cut-off voltage with a high capacity utilization of 170 mA h g−1. When paired with an Mo6S8 anode, the 2.5 V aqueous full cell delivered a high energy density of 120 W h kg−1 for 1000 cycles with an extremely low capacity decay rate of 0.013% per cycle.", "keywords": "", "authors": [ { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Yuxiao Lin", "org": "Department of Chemical Engineering and Materials Science, Michigan State University,East Lansing,USA" }, { "name": "Liumin Suo", "org": "" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Yue Qi", "org": "Department of Chemical Engineering and Materials Science, Michigan State University,East Lansing,USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory,Adelphi,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Energy and Environmental Science", "year": 2016 }, "HD9DMmQc": { "id": "HD9DMmQc", "title": "Building Self-Healing Alloy Architecture for Stable Sodium-Ion Battery Anodes: A Case Study of Tin Anode Materials", "abstract": "The rational design of anode materials is a challenge in developing sodium ion batteries. Alloy anodes provide high gravimetric and volumetric capacities but suffer the short cycle life as a result of the continuous and accumulated pulverization, resulting from a large volume change during the cycling process. Herein, using pure Sn, an irreversible conversion reaction combined with an alloy reaction (SnO), and a reversible conversion reaction combined with an alloy reaction (Sn4P3) as samples, we demonstrate that the pulverization and aggregation of the alloy anode can be partially recovered and the accumulation of pulverization and aggregation during charge/discharge cycles can be terminated using a reversible conversion reaction combined with an alloy reaction. The cycling stability of three Sn-based anodes increases in order of Sn4P3 u003e SnO u003e Sn. The enhancement in Sn4P3 can be attributed to a reversible reaction of Sn4P3 + 9Na ↔ 4Sn + 3Na3P, which repairs the cracks, damage, and aggregation of Sn parti...", "keywords": [ "sodium-ion batteries", "alloy anode", "tin anode", "self-healing", "cycling stability" ], "authors": [ { "name": "Jianfeng Mao", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Chao Luo", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Biomol & Chem Engn, College Pk, MD 20742 USA" } ], "venue": "ACS Applied Materials & Interfaces", "year": 2016 }, "JdnXQBoj": { "id": "JdnXQBoj", "title": "The Center for Research on Extreme Batteries | NIST", "abstract": "", "keywords": "", "authors": [ { "name": "Eric D. Wachsman", "org": "" }, { "name": "Cynthia Lundgren", "org": "" }, { "name": "Esther S. Takeuchi", "org": "" }, { "name": "Kang Xu", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Joseph A. Dura", "org": "" }, { "name": "David L. Jacobson", "org": "" }, { "name": "Kahlil Amine", "org": "" }, { "name": "William Acker", "org": "" } ], "venue": "The Electrochemical Society interface", "year": 2016 }, "ql8Mx3aH": { "id": "ql8Mx3aH", "title": "New Concepts in Electrolytes.", "abstract": "Over the past decades, Li-ion battery (LIB) has turned into one of the most important advances in the history of technology due to its extensive and in-depth impact on our life. Its omnipresence in all electric vehicles, consumer electronics and electric grids relies on the precisely tuned electrochemical dynamics and interactions among the electrolytes and the diversified anode and cathode chemistries therein. With consumers' demand for battery performance ever increasing, more and more stringent requirements are being imposed upon the established equilibria among these LIB components, and it became clear that the state-of-the-art electrolyte systems could no longer sustain the desired technological trajectory. Driven by such gap, researchers started to explore more unconventional electrolyte systems. From superconcentrated solvent-in-salt electrolytes to solid-state electrolytes, the current research realm of novel electrolyte systems has grown to unprecedented levels. In this review, we will avoid discussions on current state-of-the-art electrolytes but instead focus exclusively on unconventional electrolyte systems that represent new concepts.", "keywords": "", "authors": [ { "name": "Matthew Li", "org": "Department of Chemical Engineering, Waterloo Institute of Nanotechnology , University of Waterloo , 200 University Avenue West , Waterloo , Ontario N2L 3G1 , Canada." }, { "name": "Chunsheng Wang", "org": "Department of Chemical & Biomolecular Engineering Department of Chemistry & Biochemistry , University of Maryland , College Park , Maryland 20742 , United States." }, { "name": "Zhongwei Chen", "org": "Department of Chemical Engineering, Waterloo Institute of Nanotechnology , University of Waterloo , 200 University Avenue West , Waterloo , Ontario N2L 3G1 , Canada." }, { "name": "Kang Xu", "org": "Energy Storage Branch, Sensor and Electron Directorate , U.S. Army Research Laboratory , Adelphi , Maryland 20783 , United States." }, { "name": "Jun Lu", "org": "Chemical Sciences and Engineering Division , Argonne National Laboratory , 9700 Cass Avenue , Lemont , Illinois 60439 , United States." } ], "venue": "Chemical reviews", "year": 2020 }, "JTextUjw": { "id": "JTextUjw", "title": "Reverse Microemulsion Synthesis of Sulfur/Graphene Composite for Lithium/Sulfur Battery.", "abstract": "Due to high theoretical capacity, high energy density, and availability, the lithium-sulfur (Li-S) system is considered the most promising candidate for electric and hybrid electric vehicle applications. However, sulphur/carbon cathode in Li-S batteries still suffers from the low coulombic efficiency and poor cycle life when sulphur loading and the ratio of sulphur to carbon are high. Here, we address these challenges by fabricating sulfur/carboxylated-graphene composite using a reverse (water in oil) microemulsion technique. The fabricated sulfur-graphene composite cathode, which contains only 6 wt% graphene, can dramatically improve the cycling stability as well as providing high capacity. The electrochemical performance of the sulfur-graphene composite was further enhanced after loading into three-dimensional heteroatom-doped (boron and nitrogen) carbon cloth current collector. Even at high sulfur loading (~8mg/cm2) on carbon cloth, this composite shows 1256 mAh/g discharge capacity with more than 99% capacity retention after 200 cycles.", "keywords": [ "reverse microemulsion", "surfactants", "sulfur solubility", "carboxylated graphene", "functionalized carbon cloth", "sulfur cathode" ], "authors": [ { "name": "Mohammad Rejaul Kaiser", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Zhaohui Ma", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiwen Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jia-Zhao Wang", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Hua Kun Liu", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Shixue Dou", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2017 }, "C3TPotwR": { "id": "C3TPotwR", "title": "An acrylate-polymer-based electrolyte membrane for alkaline fuel cell applications.", "abstract": "", "keywords": [ "membranes", "polymerization", "energy conversion" ], "authors": [ { "name": "Yanting Luo", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA." }, { "name": "Juchen Guo", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Deryn Chu", "org": "" } ], "venue": "ChemSusChem", "year": 2011 }, "ootBowll": { "id": "ootBowll", "title": "Carbon coated hollow Na 2 FePO 4 F spheres for Na-ion battery cathodes", "abstract": "", "keywords": [ "database", "chemical engineering", "material", "chemical", "chemistry" ], "authors": [ { "name": "alex langrock", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "yihang liu", "org": "" }, { "name": "sheryl h ehrman", "org": "" }, { "name": "ayyakkannu manivannan", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Journal of Power Sources", "year": 2013 }, "Yzk4WKNn": { "id": "Yzk4WKNn", "title": "An oxide ion and proton co-ion conducting Sn0.9In 0.1P2 O7 electrolyte for intermediate- temperature fuel cells", "abstract": "The ionic conductivity of Sn0.9In0.1P2 O7 ceramic was investigated under various atmospheres within the temperature range of 130-230°C. Similar to mixed-conductive perovskite oxides at high temperatures (such as SrCe0.95Yb0.05 O 3-α, La0.9 Sr0.1Ga0.8 Mg 0.2 O3-α at 600-1000°C), Sn0.9In 0.1P2 O7 can conduct both protons and oxide ions at low temperatures (130-230°C). The conductivity of Sn 0.9In0.1P2 O7 reaches 0.019 Scm at 200°C in wet nitrogen. Its transport numbers determined by steam concentration cells are around 0.76 for a proton and 0.12 for an oxide ion. The performance of direct methanol fuel cells at 170°C using mixed-ion conductive Sn0.9In0.1P2 O7 electrolyte is higher than that at 235°C using pure proton conductive CsH2PO4 electrolyte. This is attributed to direct oxidation of CO at the anode by the oxide ions generated at the cathode and moved through the Sn0.9In0.1P2 O7 electrolyte. © 2008 The Electrochemical Society.", "keywords": [ "null" ], "authors": [ { "name": "Xilin Chen", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Chunsheng Wang", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Andrew Andrew Payzant", "org": "Oak Ridge National Laboratory(Oak Ridge National Laboratory,Oak Ridge Natl Lab),Oak Ridge,United States" }, { "name": "Changrong Xia", "org": "University of Science and Technology of China(University of Science and Technology of China,Univ. of Sci. and Technol. of China),Hefei,China" }, { "name": "Deryn Chu", "org": "U.S. Army Research Laboratory(U.S. Army Research Laboratory,Army Research Laboratory,U.S. Army Research Lab),Adelphi,United States" } ], "venue": "Journal of the Electrochemical Society", "year": 2008 }, "7bHSfBrf": { "id": "7bHSfBrf", "title": "Architectural design and fabrication approaches for solid-state batteries", "abstract": "Solid-state batteries are promising candidates for energy storage due to their potential advantages in safety, working temperature range, and energy density compared to traditional liquid-electrolyte-based batteries. Rational battery architecture design and a scalable fabrication approach are critical to realize solid-state batteries. In this article, we present the architecture, fabrication procedure, and related challenges of sulfide and oxide electrolyte-based solid-state batteries. Approaches toward intimate solid−solid contact, thin solid-electrolyte fabrication, and scale-up production are discussed. Finally, we discuss the future research directions of solid-state batteries.", "keywords": "", "authors": [ { "name": "Fang Hao", "org": "University of Houston" }, { "name": "Fudong Han", "org": "University of Maryland" }, { "name": "Yanliang Liang", "org": "" }, { "name": "Chunsheng Wang", "org": "University of Maryland" }, { "name": "Yan Yao", "org": "" } ], "venue": "Mrs Bulletin", "year": 2018 }, "GWE0X8Uh": { "id": "GWE0X8Uh", "title": "Solid-State Electrolyte Anchored with Carboxylated Azo Compound for All-Solid-State Lithium Batteries.", "abstract": "Organic electrode materials are promising for green and sustainable lithium-ion batteries. However, the high solubility of organic materials in the liquid electrolyte results in the shuttle reaction and fast capacity decay. Herein, azo compounds are firstly applied in all-solid-state lithium batteries (ASSLB) to suppress the dissolution challenge. Due to the high compatibility of azobenzene (AB) based compounds to Li3PS4 (LPS) solid electrolyte, the LPS solid electrolyte is used to prevent the dissolution and shuttle reaction of AB. To maintain the low interface resistance during the large volume change upon cycling, a carboxylate group is added into AB to provide 4-(phenylazo) benzoic acid lithium salt (PBALS), which could bond with LPS solid electrolyte via the ionic bonding between oxygen in PBALS and lithium ion in LPS. The ionic bonding between the active material and solid electrolyte stabilizes the contact interface and enables the stable cycle life of PBALS in ASSLB.", "keywords": [ "azo compounds", "carboxylate groups", "electrochemistry", "lithium batteries", "sulfide electrolytes" ], "authors": [ { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Karen J Gaskell", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20740 USA" }, { "name": "Xinzi He", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Yujia Liang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Jianjun Jiang", "org": "Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2018 }, "bxeUzAvZ": { "id": "bxeUzAvZ", "title": "Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive", "abstract": "Electrolytes that are able to reversibly deposit/strip Mg are crucial for rechargeable Mg batteries. The most studied complex electrolytes based on Lewis acid-base chemistry are expensive, difficult to be synthesized, and show limited anodic stability. Conventional electrolytes using simple salts such as Mg(TFSI)(2) can be readily synthesized, but Mg deposition/stripping in these simple salt electrolytes is accompanied by a large overpotential due to the formation of a surface layer on the Mg metal with a low Mg ion conductivity. Here the overpotential for Mg deposition/stripping in a simple salt, Mg(TFSI)(2)-1,2-dimethoxyethane (DME), electrolyte is significantly reduced by adding a small concentration of iodine (<= 50 x 10(-3) M) as an additive. Mechanism studies demonstrate that an Mg ion conductive solid MgI2 layer is formed on the surface of the Mg metal and acts as a solid electrolyte interface. With the Mg(TFSI)(2)-DME-I-2 electrolyte, a very small voltage hysteresis is achieved in an Mg-S full cell.", "keywords": [ "electrochemistry", "iodine additive", "Mg(TFSI)(2)-DME simple salt electrolyte", "reduce overpotential", "sulfur" ], "authors": [ { "name": "Xiaogang Li", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Xiaogang Li", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Fudong Han", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Zhaohui Ma", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Nico Eidson", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" }, { "name": "Weishan Li", "org": "" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2018 }, "WwLge0WN": { "id": "WwLge0WN", "title": "How Water Accelerates Bivalent Ion Diffusion.", "abstract": "The effect of H2O in electrolytes and in electrode lattices on the thermodynamics and kinetics of reversible multivalent-ion intercalation chemistry based on a model platform of layered VOPO4 has been investigated. The presence of H2O at the electrolyte/electrode interface plays a key role in assisting Zn2+ diffusion from electrolyte to the surface, while H2O in the lattice structure alters the working potential. More importantly, a dynamic equilibrium between bulk electrode and electrolyte is eventually reached for H2O transport during the charge/discharge cycles, with the water activity serving as the key parameter determining the direction of water movement and the cycling stability.", "keywords": [ "batteries", "electrochemistry", "electrolytes", "kinetics", "water" ], "authors": [ { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Wei Sun", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Zulipiya Shadike", "org": "Brookhaven Natl Lab, Div Chem, Upton, NY 11973 USA" }, { "name": "Enyuan Hu", "org": "Brookhaven Natl Lab, Div Chem, Upton, NY 11973 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiao-Qing Yang", "org": "Brookhaven Natl Lab, Div Chem, Upton, NY 11973 USA" }, { "name": "Kang Xu", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2018 }, "APiPgEls": { "id": "APiPgEls", "title": "Revealing Reaction Pathways of Collective Substituted Iron Fluoride Electrode for Lithium Ion Batteries.", "abstract": "Metal fluorides present a high redox potential among the conversion-type compounds, which make them specially work as cathode materials of lithium ion batteries. To mitigate the notorious cycling instability of conversion-type materials, substitutions of anion and cation have been proposed but the role of foreign elements in reaction pathway is not fully assessed. In this work, we explored the lithiation pathway of a rutile-Fe0.9Co0.1OF cathode with multimodal analysis, including ex situ and in situ transmission electron microscopy and synchrotron X-ray techniques. Our work revealed a prolonged intercalation-extrusion-cation disordering process during phase transformations from the rutile phase to rocksalt phase, which microscopically corresponds to topotactic rearrangement of Fe/Co-O/F octahedra. During this process, the diffusion channels of lithium transformed from 3D to 2D while the corner-sharing octahedron changed to edge-sharing octahedron. DFT calculations indicate that the Co and O co-substitution of Fe0.9Co0.1OF cathode can improve its structural stability via stabilizing the thermodynamic semi-stable phases and reducing the thermodynamic potentials. We anticipate that our study will inspire further explorations on untraditional intercalation systems for the secondary battery applications.", "keywords": "", "authors": [ { "name": "Sooyeon Hwang", "org": "" }, { "name": "Xiao Ji", "org": "" }, { "name": "Seong-Min Bak", "org": "" }, { "name": "Ke Sun", "org": "" }, { "name": "Jianming Bai", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Hong Gan", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Dong Su", "org": "" } ], "venue": "ACS nano", "year": 2020 }, "QGNesYjx": { "id": "QGNesYjx", "title": "A Battery Made from a Single Material.", "abstract": "A single-material battery is prepared using Li10GeP2S12 as the electrolyte, anode, and cathode, based on the Li-S and Ge-S components in Li10GeP2S12 acting as the active centers for its cathode and anode performance, respectively. The single-Li10GeP2S12 battery exhibits a remarkably low interfacial resistance due to the improvement of interfacial contact and interactions, and the suppression of interfacial strain/stress.", "keywords": [ "all-solid-state", "interfacial resistance", "lithium-ion batteries", "single-materials" ], "authors": [ { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yujie Zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Gaskell Karen J", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED MATERIALS", "year": 2015 }, "eGStyQ15": { "id": "eGStyQ15", "title": "Hydrophobic organic electrolyte protected Zn anodes for aqueous Zn batteries.", "abstract": "Aqueous Zn batteries are promising energy-storage device due to low cost and high energy density. However, their lifespan is limited by irreversible Zn anodes due to water decomposition and Zn dendrite growth. Here, we separate aqueous electrolyte from Zn anode by coating a thin metal-organic framework (MOF) layer on anode and filling the pores of MOF with hydrophobic Zn(TFSI)2-tris(2,2,2-trifluoroethyl)phosphate (TFEP) organic electrolyte that is immiscible with aqueous Zn(TFSI)2-H2O bulk electrolyte. The MOF encapsulated Zn(TFSI)2-TFEP forms a ZnF2-Zn3(PO4)2 solid electrolyte interphase (SEI) preventing Zn dendrite and water decomposition. The Zn(TFSI)2-TFEP@MOF electrolyte protected Zn anode enables a Zn||Ti cell to achieve a high average Coulombic efficiency of 99.1% for 350 cycles. The highly reversible Zn anode brings a high energy density of 210 Wh kg-1 (of cathode and anode mass) and a low capacity decay rate of 0.0047% per cycle over 600 cycles in a Zn||MnO2 full cell with a low capacity ratio of Zn:MnO2 at 2:1.", "keywords": [ "Metal-organic frameworks (MOFs)", "aqueous zinc batteries", "phase separation", "reversibility" ], "authors": [ { "name": "Longsheng Cao", "org": "University of Maryland at College Park, Environmental Science and Technology, 4128 Chemistry Building, Department of Chemical & Biomolecular Engineering, Univ, 20742, USA, 20742, College Park, UNITED STATES." }, { "name": "Dan Li", "org": "University of Maryland at College Park, Environmental Science and Technology, 3410 Tulane Dr., Apt.24, 20742, USA, 20742, College Park, UNITED STATES." }, { "name": "Tao Deng", "org": "University of Maryland at College Park, Environmental Science and Technology, 20742, College park, UNITED STATES." }, { "name": "Qin Li", "org": "University of Maryland at College Park, Environmental Science and Technology, 4128 Chemistry Building, Department of Chemical &, USA, 20742, COLLEGE PARK, UNITED STATES." }, { "name": "Chunsheng Wang", "org": "University of Maryland, Department of Chemical & Biomolecular Engineering, 1223A Chemical and Nuclear Engineering, 20742, College Park, UNITED STATES." } ], "venue": "Angewandte Chemie (International ed. in English)", "year": 2020 }, "xDI8cXwz": { "id": "xDI8cXwz", "title": "Atomic-Layer-Deposition Functionalized Carbonized Mesoporous Wood Fiber for High Sulfur Loading Lithium Sulfur Batteries.", "abstract": "Lithium-sulfur battery (LSB) as one of the most promising energy storage devices suffers from poor conductivity of sulfur and fast capacity decay triggered by the dissolution of polysulfides. In this work, functionalized carbonized mesoporous wood fiber (f-CMWF) is employed as a host to accommodate sulfur for the first time. Natural wood microfiber has unique hierarchical and mesoporous structure, which is well-maintained after carbonization. With such a hierarchical mesoporous structure, a high sulfur loading of 76 wt % is achieved in CMWF electrodes. The pore size of CMWF is tunable by atomic layer deposition (ALD) of a 5 nm AlO coating to form the f-CMWF. Such a thin layer slightly decreases the sulfur loading to 70%, but it remarkably promotes the cyclic stability of sulfur cathode, which delivers an initial capacity of 1115 mAh g, and maintains a reversible capacity of 859 mAh g for 450 cycles, corresponding to a slow capacity decay rate of 0.046% per cycle. More importantly, natural wood microfiber is first used as a raw material for sulfur encapsulating. This work is also critical for using low cost and mesoporous biomass carbon as bifunctional scaffold for LSB.", "keywords": [ "atomic layer deposition", "carbonized wood fiber", "lithium−sulfur battery", "small sulfur molecule", "tunable pore size" ], "authors": [ { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Hongli Zhu", "org": "Northeastern University , Department of Mechanical and Industrial Engineering, 360 Huntington Avenue, Boston, Massachusetts 02115-5005, United States." }, { "name": "Wei Luo", "org": "Univ Maryland, Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Fei Shen", "org": "Univ Maryland, Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jiaqi Dai", "org": "Univ Maryland, Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Yujia Liang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Liangbing Hu", "org": "Univ Maryland, Mat Sci & Engn, College Pk, MD 20742 USA" } ], "venue": "ACS applied materials & interfaces", "year": 2017 }, "rDPXi0Gt": { "id": "rDPXi0Gt", "title": "Preventing lithium dendrite-related electrical shorting in rechargeable batteries by coating separator with a Li-killing additive", "abstract": "Dendritic electrodeposition is an intrinsic feature of Li metal, and Li dendrite-related electrical shorting is a major cause of thermal runaway in Li metal batteries. In order to prevent such electrical shorting, a Li-killing layer consisting of TiO2 nanoparticles embedded in a porous Kynar polymer matrix is coated onto one side of a conventional Celgard separator and faced to the cathode. After filling with liquid electrolyte, the Kynar polymer swells to a gel while TiO2 serves as a Li-killer by reacting with the Li dendrites that penetrate through the separator. Additionally, the Li-killing layer increases the thermal dimensional stability of the separator, and the wettability, uptake and uphold of the liquid electrolyte. It is shown that a Li/Cu cell with the Li-killing layer does not undergo electrical shorting even if the Li metal is entirely plated onto the counter electrode, whereas an identical cell using a pristine separator rapidly experiences shorting. Moreover, the Li-killing layer increases the rate capability and capacity retention of a Li/LiNi0.80Mn0.10Co0.10O2 cell. Impedance analysis reveals that such improvements are attributed to increased electrolyte uptake and uphold, which consequently reduces the solid electrolyte interphase resistance and charger-transfer resistance.", "keywords": "", "authors": [ { "name": "Sheng S. Zhang", "org": "Electrochemistry Branch, RDRL-SED-C, Sensors and Electron Devices Directorate, U.S. Army Research Laboratory,Adelphi,USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Journal of Materials Chemistry", "year": 2018 }, "ol0L4By7": { "id": "ol0L4By7", "title": "Tuning the Anode-Electrolyte Interface Chemistry for Garnet-Based Solid-State Li Metal Batteries.", "abstract": "Lithium (Li) metal is a promising candidate as the anode for high-energy-density solid-state batteries. However, interface issues, including large interfacial resistance and the generation of Li dendrites, have always frustrated the attempt to commercialize solid-state Li metal batteries (SSLBs). Here, it is reported that infusing garnet-type solid electrolytes (GSEs) with the air-stable electrolyte Li3PO4 (LPO) dramatically reduces the interfacial resistance to approximate to 1 omega cm(2) and achieves a high critical current density of 2.2 mA cm(-2) under ambient conditions due to the enhanced interfacial stability to the Li metal anode. The coated and infused LPO electrolytes not only improve the mechanical strength and Li-ion conductivity of the grain boundaries, but also form a stable Li-ion conductive but electron-insulating LPO-derived solid-electrolyte interphase between the Li metal and the GSE. Consequently, the growth of Li dendrites is eliminated and the direct reduction of the GSE by Li metal over a long cycle life is prevented. This interface engineering approach together with grain-boundary modification on GSEs represents a promising strategy to revolutionize the anode-electrolyte interface chemistry for SSLBs and provides a new design strategy for other types of solid-state batteries.", "keywords": [ "garnet electrolytes", "interfacial chemistry", "lithium dendrites", "solid-electrolyte interphase", "solid-state batteries" ], "authors": [ { "name": "Tao Deng", "org": "Pacific Northwest Natl Lab, Energy & Environm Directorate, 902 Battelle Blvd, Richland, WA 99354 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yang Zhao", "org": "Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada" }, { "name": "Longsheng Cao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Shuang Li", "org": "Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA" }, { "name": "Sooyeon Hwang", "org": "Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA" }, { "name": "Chao Luo", "org": "George Mason Univ, Dept Chem & Biochem, Fairfax, VA 22030 USA" }, { "name": "Pengfei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Haiping Jia", "org": "Pacific Northwest Natl Lab, Energy & Environm Directorate, 902 Battelle Blvd, Richland, WA 99354 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiaochuan Lu", "org": "North Carolina A&T State Univ, Dept Appl Engn Technol, Greensboro, NC 27411 USA" }, { "name": "Dong Su", "org": "Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA" }, { "name": "Xueliang Sun", "org": "Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ji-Guang Zhang", "org": "Pacific Northwest Natl Lab, Energy & Environm Directorate, 902 Battelle Blvd, Richland, WA 99354 USA" } ], "venue": "ADVANCED MATERIALS", "year": 2020 }, "bQ0qmvsf": { "id": "bQ0qmvsf", "title": "Enabling safe aqueous lithium ion open batteries by suppressing oxygen reduction reaction.", "abstract": "Due to the non-flammable nature of water-based electrolytes, aqueous lithium-ion batteries are resistant to catching fire. However, they are not immune to the risk of explosion, since the sealing structure adopted by current batteries limits the dissipation of heat and pressure within the cells. Here, we report a safe aqueous lithium-ion battery with an open configuration using water-in-salt electrolytes and aluminum oxide coated anodes. The design can inhibit the self-discharge by substantially suppressing the oxygen reduction reaction on lithiated anodes and enable good cycle performance over 1000 times. Our study may open a pathway towards safer lithium-ion battery designs.", "keywords": "", "authors": [ { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Longsheng Cao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Qin Li", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Chongyin Yang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Nico Eidson", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Chunsheng Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA. cswang@umd.edu." } ], "venue": "Nature communications", "year": 2020 }, "uphZUQbk": { "id": "uphZUQbk", "title": "Ether-based electrolyte enabled Na/FeS 2 rechargeable batteries", "abstract": "", "keywords": [], "authors": [ { "name": "yujie zhu", "org": "" }, { "name": "liumin suo", "org": "" }, { "name": "tao gao", "org": "" }, { "name": "xiulin fan", "org": "" }, { "name": "fudong han", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Electrochemistry Communications", "year": 2015 }, "jZwuEwXd": { "id": "jZwuEwXd", "title": "Structure and Interface Design Enable Stable Li-Rich Cathode.", "abstract": "Li-rich layered-oxide cathodes have the highest theoretical energy density among all the intercalated cathodes, which have attracted intense interests for high energy Li-ion batteries. However, O3-structured layered-oxide cathodes suffer from a low initial Coulombic efficiency (CE), severe voltage fade, and poor cycling stability because of the continuous oxygen release, structural rearrangements due to irreversible transition-metal migration, and serious side reactions between the delithiated cathode and electrolyte. Herein, we report that these challenges are migrated by using a stable O2-structured Li1.2Ni0.13Co0.13Mn0.54O2 (O2-LR-NCM) and all-fluorinated electrolyte. The O2-LR-NCM can restrict the transition metals migrating into the Li layer and the in situ formed fluorinated cathode electrolyte interphase (CEI) on the surface of the O2-LR-NCM from the decomposition of all-fluorinated electrolyte during initial cycles effectively restrains the structure transi-tion, suppresses the O2 release, and thereby safeguards the transition metal redox couples, enabling a highly reversible and stable oxygen redox reaction. O2-LR-NCM in all fluorinated electrolytes achieves a high initial CE of 99.82 % and cycling CE of and cycling CE of >99.9%, high reversible capacity of 278 mAh/g, and high capacity retention of 83.3% after 100 cycles. The synergic design of electrolyte and cathode structure represents a promising direction to stabilize high-energy cathodes.", "keywords": "", "authors": [ { "name": "Chunyu Cui", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Xiuquan Zhou", "org": "" }, { "name": "Ji Chen", "org": "" }, { "name": "Qinchao Wang", "org": "" }, { "name": "Lu Ma", "org": "" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Enyuan Hu", "org": "" }, { "name": "Xiao-Qing Yang", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of the American Chemical Society", "year": 2020 }, "Aqn4tJV9": { "id": "Aqn4tJV9", "title": "In situ formed carbon bonded and encapsulated selenium composites for Li–Se and Na–Se batteries", "abstract": "", "keywords": [], "authors": [ { "name": "chao luo", "org": "university of maryland college park" }, { "name": "jingjing wang", "org": "university of maryland college park" }, { "name": "liumin suo", "org": "university of maryland college park" }, { "name": "jianfeng mao", "org": "university of maryland college park" }, { "name": "xiulin fan", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "", "year": 2014 }, "XQCfCqLW": { "id": "XQCfCqLW", "title": "Interface engineering on cathode side for solid garnet batteries", "abstract": "Abstract The garnet solid electrolyte battery confronts crucial challenges of electronic/ionic conduction inside the cathode and interfacial contact between the cathode and the electrolyte. In this report, a super ion/electron conductive LiCoO2 (LCO) material is fabricated by partially coating nano Li6.375La3Zr1.375Nb0.625O12 (LLZNO) electrolyte on LCO and then filling Super P carbons into the uncoated space. This configuration offers continuous ionically and electronically conducting networks inside the LCO cathode. In addition, an intermediate layer of N-Methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13-TFSI) is introduced in between the composite cathode and the garnet electrolyte to form a solid-state ionically conducting interphase during charge/discharge cycles. Through the above interfacial engineering, the solid garnet batteries based on LiCoO2 run as long as 400 cycles with the capacity retention of 80.2% at 0.2 C and 60 °C.", "keywords": "", "authors": [ { "name": "Zhijie Bi", "org": "College of Physics, Qingdao University, Qingdao 266071, China" }, { "name": "Ning Zhao", "org": "College of Physics, Qingdao University, Qingdao 266071, China" }, { "name": "Lina Ma", "org": "College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China" }, { "name": "Zhengqian Fu", "org": "Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China" }, { "name": "Fangfang Xu", "org": "Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, MD 20742, United States" }, { "name": "Xiangxin Guo", "org": "College of Physics, Qingdao University, Qingdao 266071, China" } ], "venue": "Chemical Engineering Journal", "year": 2020 }, "EOccoKnj": { "id": "EOccoKnj", "title": "A polymer scaffold binder structure for high capacity silicon anode of lithium-ion battery.", "abstract": "A sodium carboxymethyl cellulose porous scaffold has been obtained using the slurry spray technique as a binder for silicon anodes that demonstrate remarkably improved cycling stability and rate performance.", "keywords": [], "authors": [ { "name": "Juchen Guo", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Chemical communications (Cambridge, England)", "year": 2010 }, "NYUY7Kay": { "id": "NYUY7Kay", "title": "Self-assembled organic nanowires for high power density lithium ion batteries.", "abstract": "The electroactive organic materials are promising alternatives to inorganic electrode materials for the new generation of green Li-ion batteries due to their sustainability, environmental benignity, and low cost. Croconic acid disodium salt (CADS) was used as Li-ion battery electrode, and CADS organic wires with different diameters were fabricated through a facile synthetic route using antisolvent crystallization method to overcome the challenges of low electronic conductivity of CADS and lithiation induced strain. The CADS nanowire exhibits much better electrochemical performance than its crystal bulk material and microwire counterpart. CADS nanowire with a diameter of 150 nm delivers a reversible capability of 177 mAh g(-1) at a current density of 0.2 C and retains capacity of 170 mAh g(-1) after 110 charge/discharge cycles. The nanowire structure also remarkably enhances the kinetics of croconic acid disodium salt. The CADS nanowire retains 50% of the 0.1 C capacity even when the current density increases to 6 C. In contrast, the crystal bulk and microwire material completely lose their capacities when the current density merely increases to 2 C. Such a high rate performance of CADS nanowire is attributed to its short ion diffusion pathway and large surface area, which enable fast ion and electron transport in the electrode. The theoretical calculation suggests that lithiation of CADS experiences an ion exchange process. The sodium ions in CADS will be gradually replaced by lithium ions during the lithiation and delithiation of CADS electrode, which is confirmed by inductively coupled plasma test.", "keywords": [], "authors": [ { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland , College Park, Maryland 20742, United States." }, { "name": "Ruiming Huang", "org": "" }, { "name": "Ruslan Kevorkyants", "org": "" }, { "name": "Michele Pavanello", "org": "" }, { "name": "Huixin He", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano letters", "year": 2014 }, "acIQOHDC": { "id": "acIQOHDC", "title": "Reactivation of dissolved polysulfides in Li–S batteries based on atomic layer deposition of Al 2 O 3 in nanoporous carbon cloth", "abstract": "", "keywords": [ "atomic layer deposition" ], "authors": [ { "name": "xiaogang han", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "xinyi chen", "org": "" }, { "name": "yuchen chen", "org": "" }, { "name": "nicholas weadock", "org": "" }, { "name": "jiayu wan", "org": "" }, { "name": "hongli zhu", "org": "" }, { "name": "yonglin liu", "org": "" }, { "name": "heqin li", "org": "" }, { "name": "gary w rubloff", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "liangbing hu", "org": "" } ], "venue": "", "year": 2013 }, "puTNDdOV": { "id": "puTNDdOV", "title": "Azo Compounds Derived from Electrochemical Reduction of Nitro Compounds for High Performance Li-Ion Batteries.", "abstract": "Organic compounds are desirable alternatives for sustainable lithium-ion battery electrodes. However, the electrochemical properties of state-of-the-art organic electrodes are still worse than commercial inorganic counterparts. Here, a new chemistry is reported based on the electrochemical conversion of nitro compounds to azo compounds for high performance lithium-ion batteries. 4-Nitrobenzoic acid lithium salt (NBALS) is selected as a model nitro compound to systemically investigate the structure, lithiation/delithiation mechanism, and electrochemical performance of nitro compounds. NBALS delivers an initial capacity of 153 mAh g(-1) at 0.5 C and retains a capacity of 131 mAh g(-1) after 100 cycles. Detailed characterizations demonstrate that during initial electrochemical lithiation, the nitro group in crystalline NBALS is irreversibly reduced into an amorphous azo compound. Subsequently, the azo compound is reversibly lithiated/delithiated in the following charge/discharge cycles with high electrochemical performance. The lithiation/delithiation mechanism of azo compounds is also validated by directly using azo compounds as electrode materials, which exhibit similar electrochemical performance to nitro compounds, while having a much higher initial Coulombic efficiency. Therefore, this work proves that nitro compounds can be electrochemically converted to azo compounds for high performance lithium-ion batteries.", "keywords": [ "azo compound", "electrochemical conversion", "lithium-ion batteries", "nitro compound", "organic electrode materials" ], "authors": [ { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Nico Eidson", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yujia Liang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Deng", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jianjun Jiang", "org": "Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED MATERIALS", "year": 2018 }, "VCauRQz9": { "id": "VCauRQz9", "title": "Expanded graphite as superior anode for sodium-ion batteries.", "abstract": "Graphite, as the most common anode for commercial Li-ion batteries, has been reported to have a very low capacity when used as a Na-ion battery anode. It is well known that electrochemical insertion of Na(+) into graphite is significantly hindered by the insufficient interlayer spacing. Here we report expanded graphite as a Na-ion battery anode. Prepared through a process of oxidation and partial reduction on graphite, expanded graphite has an enlarged interlayer lattice distance of 4.3 Å yet retains an analogous long-range-ordered layered structure to graphite. In situ transmission electron microscopy has demonstrated that the Na-ion can be reversibly inserted into and extracted from expanded graphite. Galvanostatic studies show that expanded graphite can deliver a high reversible capacity of 284 mAh g(-1) at a current density of 20 mA g(-1), maintain a capacity of 184 mAh g(-1) at 100 mA g(-1), and retain 73.92% of its capacity after 2,000 cycles.", "keywords": [ "Chemical sciences", " Materials science", " Physical chemistry" ], "authors": [ { "name": "Yang Wen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA;These authors contributed equally to the work" }, { "name": "Kai He", "org": "These authors contributed equally to the work" }, { "name": "Yujie Zhu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA;These authors contributed equally to the work" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Yunhua Xu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Kai He", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "John Cumings", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Isamu Matsuda", "org": "Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA" }, { "name": "Yoshitaka Ishii", "org": "Center for Structural Biology, University of Illinois at Chicago, Chicago, Illinois 60607, USA;Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA" } ], "venue": "Nature communications", "year": 2014 }, "ZiYhWOhF": { "id": "ZiYhWOhF", "title": "High-Performance All-Solid-State Lithium–Sulfur Battery Enabled by a Mixed-Conductive Li2S Nanocomposite", "abstract": "All-solid-state lithium–sulfur batteries (ASSLSBs) using highly conductive sulfide-based solid electrolytes suffer from low sulfur utilization, poor cycle life, and low rate performance due to the huge volume change of the electrode and the poor electronic and ionic conductivities of S and Li2S. The most promising approach to mitigate these challenges lies in the fabrication of a sulfur nanocomposite electrode consisting of a homogeneous distribution of nanosized active material, solid electrolyte, and carbon. Here, we reported a novel bottom-up method to synthesize such a nanocomposite by dissolving Li2S as the active material, polyvinylpyrrolidone (PVP) as the carbon precursor, and Li6PS5Cl as the solid electrolyte in ethanol, followed by a coprecipitation and high-temperature carbonization process. Li2S active material and Li6PS5Cl solid electrolyte with a particle size of ∼4 nm were uniformly confined in a nanoscale carbon matrix. The homogeneous nanocomposite electrode consisting of different nanopar...", "keywords": "", "authors": [ { "name": "Fudong Han", "org": "" }, { "name": "Jie Yue", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Tao Gao", "org": "" }, { "name": "Chao Luo", "org": "" }, { "name": "Zhaohui Ma", "org": "" }, { "name": "Liumin Suo", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano Letters", "year": 2016 }, "rvuiLVr5": { "id": "rvuiLVr5", "title": "Both Cationic and Anionic Redox Chemistry in a P2-Type Sodium Layered Oxide", "abstract": "Abstract The demand for high energy Na-ion batteries has promoted intensive research on high energy oxygen redox chemistry in layered transition metal oxide cathodes. However, most layered cathodes with oxygen redox might suffer from irreversible electrochemical reaction, fast capacity decay and underlying O2 release. Herein, we report that copper element with a strong electronegativaty can stablize Na-deficient P2-Na2/3Mn0.72Cu0.22Mg0.06O2 phase to achieve both cationic and anionic redox chemistry. Hard and soft X-ray absorption spectra demonstrate that all Mn3+/Mn4+, Cu2+/Cu3+ and O2-/(O2)n- participate in the redox reaction upon Na+ ions extraction and insertion. Density functional theory (DFT) calculations confirm that the strong covalency between copper and oxygen ensures the cationic and anionic redox activity in P2-Na2/3Mn0.72Cu0.22Mg0.06O2 phase. The P2-Na2/3Mn0.72Cu0.22Mg0.06O2 cathode could deliver stable cycling life with 87.9 % capacity retention at 1C during 100 cycles, as well as high rate performance (70.3 mA h g−1 cycled at 10C). Our findings not only provide a promising guidelines to enhance the electrochemical performance of layered oxides based on anionic redox activity, but also explore the potential science behind oxygen redox process.", "keywords": "", "authors": [ { "name": "Peng-Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Yao Xiao", "org": "Chinese Academy of Sciences" }, { "name": "Nan Piao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Qin-Chao Wang", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Ting Jin", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Yu-Jie Guo", "org": "Chinese Academy of Sciences" }, { "name": "Sufu Liu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Chunyu Cui", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" }, { "name": "Yu-Guo Guo", "org": "Chinese Academy of Sciences" }, { "name": "Xiao-Qing Yang", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA" } ], "venue": "Nano Energy", "year": 2020 }, "UTtGDn8D": { "id": "UTtGDn8D", "title": "Electrochemical Stability of Li10GeP2S12 and Li7La3Zr2O12 Solid Electrolytes", "abstract": "The electrochemical stability window of solid electrolyte is overestimated by the conventional experimental method using a Li/electrolyte/inert metal semiblocking electrode because of the limited contact area between solid electrolyte and inert metal. Since the battery is cycled in the overestimated stability window, the decomposition of the solid electrolyte at the interfaces occurs but has been ignored as a cause for high interfacial resistances in previous studies, limiting the performance improvement of the bulk-type solid-state battery despite the decades of research efforts. Thus, there is an urgent need to identify the intrinsic stability window of the solid electrolyte. The thermodynamic electrochemical stability window of solid electrolytes is calculated using first principles computation methods, and an experimental method is developed to measure the intrinsic electrochemical stability window of solid electrolytes using a Li/electrolyte/electrolyte-carbon cell. The most promising solid electrolytes, Li10GeP2S12 and cubic Li-garnet Li7La3Zr2O12, are chosen as the model materials for sulfide and oxide solid electrolytes, respectively. The results provide valuable insights to address the most challenging problems of the interfacial stability and resistance in high-performance solid-state batteries.", "keywords": "", "authors": [ { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yizhou Zhu", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Xingfeng He", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Yifei Mo", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2016 }, "xHRJWjga": { "id": "xHRJWjga", "title": "Existence of Solid Electrolyte Interphase in Mg Batteries: Mg/S Chemistry as an Example.", "abstract": "Magnesium redox chemistry is a very appealing \"beyond Li ion chemistry\" for realizing high energy density batteries due to the high capacity, low reduction potential, and most importantly, highly reversible and dendrite-free Mg metal anode. However, the progress of rechargeable Mg batteries has been greatly hindered by shortage of electrolytes with wide stability window, high ionic conductivity, and good compatibility with cathode materials. Unlike solid electrolyte interphase on Li metal anode, surface film formed by electrolyte decomposition in Mg electrolytes was considered to block Mg ion transport and passivate Mg electrode. For this reason, the attention of the community has been mainly focusing on surface layer free electrolytes, while reductively unstable salts/solvents are barely considered, despite many of them possess all the necessary properties for good electrolytes. Here for the first time we demonstrate that the surface film formed by electrolyte decomposition can function as a solid electrolyte interphase (SEI). Using Mg/S chemistry as a model system, the SEI formation mechanism on Mg metal anode is thoroughly examined using electrochemical methods and surface chemistry characterization techniques such as EDX and XPS. Based on these results, a comprehensive view of the Mg/electrolyte interphase that unifies both the SEI mechanism and passivation layer mechanism is proposed, and the conditions for SEI formation is distinguished. This new picture of surface layer on Mg metal anode in Mg batteries will not only revolutionize current understanding of Mg/electrolyte interphases, but also open new avenues for electrolyte development by uncovering the potential of those reductively unstable candidates through interphase design.", "keywords": [ "magnesium battery", "sulfur", "electrolyte", "solid electrolyte interphase", "electrochemistry", "surface chemistry" ], "authors": [ { "name": "Tao Gao", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Singyuk Hou", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Khue Huynh", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Fei Wang", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Nico Eidson", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Xiulin Fan", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Fudong Han", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Chao Luo", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Minglei Mao", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiaogang Li", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Chunsheng Wang", "org": "Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" } ], "venue": "ACS applied materials & interfaces", "year": 2018 }, "dB2jIQbF": { "id": "dB2jIQbF", "title": "Carbon scaffold structured silicon anodes for lithium-ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "Juchen Guo", "org": "" }, { "name": "Xilin Chen", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of Materials Chemistry", "year": 2010 }, "CoyGXYSJ": { "id": "CoyGXYSJ", "title": "Structure-Property Relationships of Organic Electrolytes and Their Effects on Li/S Battery Performance.", "abstract": "Electrolytes, which are a key component in electrochemical devices, transport ions between the sulfur/carbon composite cathode and the lithium anode in lithium-sulfur batteries (LSBs). The performance of a LSB mostly depends on the electrolyte due to the dissolution of polysulfides into the electrolyte, along with the formation of a solid-electrolyte interphase. The selection of the electrolyte and its functionality during charging and discharging is intricate and involves multiple reactions and processes. The selection of the proper electrolyte, including solvents and salts, for LSBs strongly depends on its physical and chemical properties, which is heavily controlled by its molecular structure. In this review, the fundamental properties of organic electrolytes for LSBs are presented, and an attempt is made to determine the relationship between the molecular structure and the properties of common organic electrolytes, along with their effects on the LSB performance.", "keywords": [ "lithium-sulfur batteries", "organic electrolytes", "structure-property relationships" ], "authors": [ { "name": "Mohammad Rejaul Kaiser", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Shulei Chou", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Hua-Kun Liu", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Shi-Xue Dou", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jiazhao Wang", "org": "Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia" } ], "venue": "ADVANCED MATERIALS", "year": 2017 }, "xxRWdvBR": { "id": "xxRWdvBR", "title": "Superior reversible tin phosphide-carbon spheres for sodium ion battery anode", "abstract": "Sodium ion batteries (SIB) have potential for large scale renewable energy storage due to geopolitical abundance of Na. However, the high capacity Na-ion anodes still suffer from poor cycling stability and low Coulombic efficiency (CE). Herein, uniform Sn4P3@C spheres were synthesized by a facile aerosol spray-pyrolysis-phosphidation method. By tuning the electrolyte, a reversible capacity of ~ 800 mAh/g with an extremely low capacity decay rate of 0.09% per cycle was achieved with a record-high initial CE (> 90%) and high cyclic CE (~ 99.9%). The Sn4P3@C in the stable ether-based electrolyte shows the highest accumulated cycling capacities in the reported SIB anodes.", "keywords": [ "Sodium ion batteries", "Anodes", "Coulombic efficiency", "Tin phosphide" ], "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;" }, { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;" }, { "name": "Junkai Hu", "org": "Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA;" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;" } ], "venue": "Nano Energy", "year": 2017 }, "iHTruWZJ": { "id": "iHTruWZJ", "title": "In situ formed lithium sulfide/microporous carbon cathodes for lithium-ion batteries.", "abstract": "Highly stable sulfur/microporous carbon (S/MC) composites are prepared by vacuum infusion of sulfur vapor into microporous carbon at 600 °C, and lithium sulfide/microporous carbon (Li2S/MC) cathodes are fabricated via a novel and facile in situ lithiation strategy, i.e., spraying commercial stabilized lithium metal powder (SLMP) onto a prepared S/MC film cathode prior to the routine compressing process in cell assembly. The in situ formed Li2S/MC film cathode shows high Coulombic efficiency and long cycling stability in a conventional commercial Li-ion battery electrolyte (1.0 M LiPF6 + EC/DEC (1:1 v/v)). The reversible capacities of Li2S/MC cathodes remain about 650 mAh/g even after 900 charge/discharge cycles, and the Coulombic efficiency is close to 100% at a current density of 0.1C, which demonstrates the best electrochemical performance of Li2S/MC cathodes reported to date. Furthermore, this Li2S/MC film cathode fabricated via our in situ lithiation strategy can be coupled with a Li-free anode, such as graphite, carbon/tin alloys, or Si nanowires to form a rechargeable Li-ion cell. As the Li2S/MC cathode is paired with a commercial graphite anode, the full cell of Li2S/MC-graphite (Li2S-G) shows a stable capacity of around 600 mAh/g in 150 cycles. The Li2S/MC cathodes prepared by high-temperate sulfur infusion and SLMP prelithiation before cell assembly are ready to fit into current Li-ion batteries manufacturing processes and will pave the way to commercialize low-cost Li2S-G Li-ion batteries.", "keywords": [ "li-ion battery", "li2s", "lithium-sulfur", "microporous carbon" ], "authors": [ { "name": "Shiyou Zheng", "org": "University of Shanghai for Science and Technology(University of Shanghai for Science and Technology),Shanghai,China" }, { "name": "Yvonne Chen", "org": "Saft(SAFT),Bagnolet,France" }, { "name": "Yunhua Xu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Feng Yi", "org": "National Institute of Standards and Technology(^ National Institute of Standards and Technology,Natl. Inst. of Std. and Technology),Gaithersburg,United States" }, { "name": "Yujie Zhu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Yihang Liu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Junhe Yang", "org": "University of Shanghai for Science and Technology(University of Shanghai for Science and Technology),Shanghai,China" }, { "name": "Chunsheng Wang", "org": "University of Maryland(University of Maryland),College Park,United States" } ], "venue": "ACS nano", "year": 2013 }, "dw7KHMyq": { "id": "dw7KHMyq", "title": "“Water-in-Salt” Electrolyte Makes Aqueous Sodium-Ion Battery Safe, Green, and Long-Lasting", "abstract": "Narrow electrochemical stability window (1.23 V) of aqueous electrolytes is always considered the key obstacle preventing aqueous sodium-ion chemistry of practical energy density and cycle life. The sodium-ion water-in-salt electrolyte (NaWiSE) eliminates this barrier by offering a 2.5 V window through suppressing hydrogen evolution on anode with the formation of a Na+-conducting solid-electrolyte interphase (SEI) and reducing the overall electrochemical activity of water on cathode. A full aqueous Na-ion battery constructed on Na-0.66[Mn0.66Ti0.34]O-2 as cathode and NaTi2(PO4)(3) as anode exhibits superior performance at both low and high rates, as exemplified by extraordinarily high Coulombic efficiency (>99.2%) at a low rate (0.2 C) for >350 cycles, and excellent cycling stability with negligible capacity losses (0.006% per cycle) at a high rate (1 C) for >1200 cycles. Molecular modeling reveals some key differences between Li-ion and Na-ion WiSE, and identifies a more pronounced ion aggregation with frequent contacts between the sodium cation and fluorine of anion in the latter as one main factor responsible for the formation of a dense SEI at lower salt concentration than its Li cousin.", "keywords": [ "aqueous sodium-ion electrolyte", "aqueous sodium-ion batteries", "high concentrated electrolyte", "sodium-ion batteries", "water-in-salt" ], "authors": [ { "name": "Liumin Suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Oleg Borodin", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch,Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Yuesheng Wang", "org": "Univ Chinese Acad Sci, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Key Lab Renewable Energy,Sch Phys Sci,Chinese Aca, Beijing 100190, Peoples R China" }, { "name": "Xiaohui Rong", "org": "Univ Chinese Acad Sci, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Key Lab Renewable Energy,Sch Phys Sci,Chinese Aca, Beijing 100190, Peoples R China" }, { "name": "Wei Sun", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Shuyin Xu", "org": "Univ Chinese Acad Sci, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Key Lab Renewable Energy,Sch Phys Sci,Chinese Aca, Beijing 100190, Peoples R China" }, { "name": "Marshall A. Schroeder", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch,Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Arthur V. Cresce", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch,Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Yong-Sheng Hu", "org": "Univ Chinese Acad Sci, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Key Lab Renewable Energy,Sch Phys Sci,Chinese Aca, Beijing 100190, Peoples R China" }, { "name": "Kang Xu", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch,Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2017 }, "NwUgkpyr": { "id": "NwUgkpyr", "title": "“Water-in-salt” electrolyte enables high-voltage aqueous lithium-ion chemistries", "abstract": "", "keywords": [], "authors": [ { "name": "liumin suo", "org": "university of maryland college park" }, { "name": "oleg borodin", "org": "united states army research laboratory" }, { "name": "tao gao", "org": "university of maryland college park" }, { "name": "marco olguin", "org": "united states army research laboratory" }, { "name": "janet ho", "org": "united states army research laboratory" }, { "name": "xiulin fan", "org": "university of maryland college park" }, { "name": "chao luo", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "kang xu", "org": "united states army research laboratory" } ], "venue": "Science", "year": 2015 }, "T1H1DD3H": { "id": "T1H1DD3H", "title": "Sodium‐Ion Batteries: An Advanced MoS2/Carbon Anode for High‐Performance Sodium‐Ion Batteries (Small 4/2015)", "abstract": "", "keywords": [ "anodes" ], "authors": [ { "name": "jingjing wang", "org": "university of maryland college park" }, { "name": "chao luo", "org": "university of maryland college park" }, { "name": "tao gao", "org": "university of maryland college park" }, { "name": "alex langrock", "org": "university of maryland college park" }, { "name": "a c mignerey", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "Small", "year": 2015 }, "1B2sPoKP": { "id": "1B2sPoKP", "title": "A Highly Reversible, Dendrite-Free Lithium Metal Anode Enabled by a Lithium-Fluoride-Enriched Interphase.", "abstract": "Metallic lithium is the most competitive anode material for next-generation lithium (Li)-ion batteries. However, one of its major issues is Li dendrite growth and detachment, which not only causes safety issues, but also continuously consumes electrolyte and Li, leading to low coulombic efficiency (CE) and short cycle life for Li metal batteries. Herein, the Li dendrite growth of metallic lithium anode is suppressed by forming a lithium fluoride (LiF)-enriched solid electrolyte interphase (SEI) through the lithiation of surface-fluorinated mesocarbon microbeads (MCMB-F) anodes. The robust LiF-enriched SEI with high interfacial energy to Li metal effectively promotes planar growth of Li metal on the Li surface and meanwhile prevents its vertical penetration into the LiF-enriched SEI from forming Li dendrites. At a discharge capacity of 1.2 mAh cm(-2), a high CE of >99.2% for Li plating/stripping in FEC-based electrolyte is achieved within 25 cycles. Coupling the pre-lithiated MCMB-F (Li@MCMB-F) anode with a commercial LiFePO4 cathode at the positive/negative (P/N) capacity ratio of 1:1, the LiFePO4//Li@MCMB-F cells can be charged/discharged at a high areal capacity of 2.4 mAh cm(-2) for 110 times at a negligible capacity decay of 0.01% per cycle.", "keywords": [ "dendrite-free Li plating", "high coulombic efficiency", "Li metal batteries", "LiF-enriched solid electrolyte interphase", "surface fluorinated graphite" ], "authors": [ { "name": "Chunyu Cui", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Nico Eidson", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Long Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Peng-Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED MATERIALS", "year": 2020 }, "VijxBS0t": { "id": "VijxBS0t", "title": "Quaternized poly(methyl methacrylate-co-butyl acrylate-co-vinylbenzyl chloride) membrane for alkaline fuel cells", "abstract": "Instead of modification of pre-existing polymers, a new route of preparation of polyelectrolyte OH − conductive membranes via copolymerization of selected functional monomers was reported in this study. A random copolymer of poly(methyl methacrylate- co -butyl acrylate- co -vinylbenzyl chloride) was synthesized via copolymerization, which was followed by quaternization and membrane casting. The intrinsic OH − conductivity of the free-standing polyelectrolyte membranes can reach 8.2 × 10 −3 S cm −1 at 80 °C. The alkaline fuel cells using copolymer polyelectrolytes demonstrated the feasibility of the preparation concept of these membranes. Keywords Alkaline fuel cells Anion conductive membrane Copolymerization Ionic conductivity 1 Introduction Alkaline fuel cell (AFC) research has recently made a noticeable comeback from a proton exchange membrane fuel cell (PEMFC) dominant era. Despite the promises, lack of fruition of practical proton exchange membranes (PEMs) that is more cost-efficient than Nafion, is stirring renewed interest in AFC. AFC has already been proven as an important, usable fuel cell system with several intrinsic advantages over PEMFC: the activation loss is lower in alkaline medium [1] , oxidant reduction kinetics is faster [2] and non-noble metal catalysts can be used [3] . However, the downfall of AFC, which eventually caused the shift to PEMFC, was the required use of liquid alkaline electrolytes. The alkaline solution electrolyte, which typically is highly concentrated KOH aqueous solution, can react with CO 2 to form carbonate salts that quickly contaminate the catalysts, causing the fuel cell to cease functioning. The CO 2 can come from the oxidant, such as air, or from the oxidation of hydrocarbon fuels, such as methanol. This problem must be solved in order to boost the widespread application of AFC. One possible solution is to replace the alkaline solution with a cation-free OH − conducting solid polymer alkaline electrolyte membrane (AEM). Early AEM research mainly focused on using polymer membranes as a solid matrix to hold alkaline solution. Hydrophilic polymers, such as poly(ethylene oxide) (PEO) [4–7] , chitosan [8–11] , polyvinyl alcohol (PVA) and polyacrylamide (PAA) or their copolymers [12–18] , have been used to absorb the alkaline solution, and these polymers were generally cross-linked to obtain the required mechanical properties. However, these polymer membranes are not cation-free OH − conductive, since they would not work without alkaline solution. Therefore, recent AEM studies have focused more on quaternizable polymers, which are categorized by containing chloromethyl groups that can be quaternized by tertiary amines. The quaternization of chloromethyl groups will result in dissociated Cl − ions that can be replaced by OH − ions through ion exchange to obtain an intrinsically OH − conductive polymer. Some polymer AEMs were prepared via quaternization following chloromethylation of polymers containing phenyl structures on the backbone chains, such as polyethersulfone (PES) [19] , poly(phthalazinon ether sulfone ketone) (PPESK) [20] , polysulfone (PS) [21] and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) [22] . Other polymer AEMs were obtained via quaternization of polymers containing vinylbenzyl chloride (VBC) units. Varcoe et al. have carried out numerous investigations on grafting VBC monomers onto fluorinated polyethylene chains through γ-ray radiation, followed by quaternization [23–31] . The current methods for preparation of the aforementioned solid polymer AEMs mainly focus on modifications of pre-existing polymers. A disadvantage of this method is that it is difficult to achieve a balance between OH − conductivity and mechanical properties. For instance, every repeating unit on a PS polymer chain can be chloromethylized so that the entire PS polymer chain is consequently quaternized. The degree of quaternization can only be coarsely controlled by reaction time with the tertiary amines. If the degree of quaternization is high, despite high OH − conductivity, the obtained polymer may suffer poor mechanical properties in an aqueous environment due to the strong hydrophilicity from the high degree of quaternization. Therefore, the authors report a new route to prepare polymer AEMs via polymerization of selected functional monomers. Using this procedure, OH − conductivity and mechanical properties can be balanced by varying the ratio of supporting chain monomers to OH − conducting monomers. In this study, polymer AEMs based on a copolymer of methyl methacrylate (MMA), butyl acrylate (BA) and VBC, namely poly(methyl methacrylate- co -butyl acrylate- co -vinylbenzyl chloride) (PMBV), was synthesized through free radical copolymerization. Polymerized VBC can be quaternized to provide the OH − conductivity because of its chloromethyl group. The quaternized VBC portion is expected to be hydrophilic and lack of mechanical strength in the aqueous environment. Therefore, polymer chain portion with good mechanical strength must be incorporated to balance the OH − conductivity and mechanical properties. MMA was chosen to provide this function. Because both VBC and MMA polymers are in glassy state in ambient temperature, BA polymer which is a rubbery polymer in ambient temperature was also used in the copolymer to alleviate the brittleness so that the PMBV copolymer can retain the toughness and flexibility even after quaternization, and in the aqueous environment. Three different monomer ratios were used for the copolymerization to demonstrate the effect of monomer ratio on the OH − conductivity and mechanical properties. 2 Experimental 2.1 Copolymerization 2.1.1 Materials MMA (99%), BA (99%) and VBC (97%) were all purchased from Sigma–Aldrich. Monomers were passed through an inhibitor remover (Sigma–Aldrich) column before copolymerization. Initiator, 2,2′-azobis(2-methylpropionitrile) (AIBN) was purchased from Sigma–Aldrich and used as received. Toluene was purchased from VWR and used as received as the solvent for the copolymerization. 2.1.2 Synthesis Three different molar ratios of monomers (MMA:BA:VBC = 50:40:10, 53:40:7 and 55:40:5) were used in copolymerization. A representative copolymerization process is as follows (for MMA:BA:VBC = 50:40:10): monomers (MMA: 0.15 mol, BA: 0.12 mol, VBC: 0.03 mol) were blended in 50 mL of toluene and put into a three-neck round bottom flask. The reactants mixture was heated using an oil bath, and vigorous stirring was provided by a magnetic stir bar. 5 × 10 −4 mol AIBN was added when the temperature reached 50 °C to start the copolymerization. The reactants were kept in a nitrogen environment throughout the reaction, and a condenser was used to prevent evaporation. The reaction lasted 36 h and was stopped by quenching the flask in an ice water bath. After evaporation of solvent and unreacted monomers in the hood for 24 h, the copolymer was dried in a vacuum oven at 50 °C for another 24 h. Scheme 1 demonstrates the synthesis methodology of PMBV. 2.1.3 Characterization Gel permeation chromatography (GPC, Waters 2410 Refractive Index Detector, Polymer Labs mixed-bed columns) using tetrahydrofuran (THF) as the carrier was used to determine the molecular weight (MW) and molecular weight distribution (polydispersity index, PDI) of PMBV. Five standard polystyrene samples (Easical ® from Polymer Laboratories) with different MWs (7.5 × 10 6 , 8.417 × 10 5 , 1.48 × 10 5 , 2.85 × 10 4 and 2930 g mol −1 ) were used as the reference for GPC analysis. The GPC spectra of polystyrene standards were fitted using a third-order polynomial equation which was used to extrapolate the MWs of the obtained PMBV copolymers. Proton nuclear magnetic resonance ( 1 H NMR, Bruker DRX-400 high resolution) was used to determine the composition of the obtained PMBV using d -chloroform as the solvent. The NMR results revealed the actual VBC composition in the copolymer rather than the monomer in the reactants mixture. Differential scanning calorimetry (DSC, TA Instruments Q100) was used to determine the glass transition temperature ( T g ) of PMBV. The heat–cool–heat procedure was applied between 120 and −20 °C at a rate of 10 °C min −1 . 2.2 AEM preparation and characterization The obtained PMBV was dissolved in dimethylformamide (DMF) and quaternized through reaction with trimethylamine (Me 3 N, Sigma–Aldrich) for 8 h at room temperature ( Scheme 2 ). The quaternized PMBV (QPMBV) solution was then casted into a membrane on a leveled smooth surface and dried in the fume hood for 24 h and then in the vacuum oven at 60 °C for an additional 24 h. Fig. 1 shows a picture of as-prepared QPMBV membrane. All as-prepared membranes have uniform thickness around 120 μm. The obtained membrane was soaked in 6 M KOH solution overnight to exchange Cl − to OH − . The OH − exchanged QPMBV membrane was washed with de-ionized water until a pH of 7 was reached. 2.2.1 Mechanical property The mechanical properties of pristine PMBV, dry QPMBV and wet QPMBV membranes were tested using a dynamic mechanical analyzer (DMA, TA Instruments Q800) by tensile tests at room temperature. The stretch rate was 1 N min −1 . Water uptake percentage of the wet QPMBV was determined by gravimetric method. The wet QPMBV membranes were first dried on the vacuum oven and then immersed in de-ionized water for 20 min for water uptake test: (1) water uptake = M wet − M dry M dry × 100 % 2.2.2 Ion-exchange capacity The ion-exchange capacity (IEC) of the QPMBV membrane was measured by acid-based back-titration. The dry QPMBV sample was immersed in 6 M KOH solution overnight to exchange into OH − form. After washed with adequate amount of de-ionized water till pH value reaching 7, the sample was soaked in 30 mL of 0.01 M standardized HCl solution for 1 day to ensure the neutralization of OH − in the membrane. The IEC value was then determined from back-titration of the excess HCl with 0.01 M NaOH solution, which can be calculated by (2) IEC = ( V HCl − V NaOH ) × C m dry ( mmol g − 1 ) where V HCl is the volume of HCl solution for membrane soaking; V NaOH is the volume of NaOH solution used in back-titration; C is the concentration of HCl and NaOH solutions (0.01 M). m dry is the mass of the dry QPMBV sample. 2.2.3 Anion conductivity The conductivities of the OH − exchanged QPMBV membranes were measured using electrochemical impedance spectroscopy (EIS) (1287/1260 Solartron) with a standard four-probe conductivity measurement technique. The effects of temperature on conductivity were tested in an environment chamber (sub-zero) at a relative humidity (RH) of 80%. Conductivity σ was calculated by (3) σ = l R a b where l is the membrane thickness, a is the membrane width, b is the membrane length and R is the resistance obtained from EIS. A few recent studies [32–35] suggested that exposure to CO 2 could have significant impact on the anion conductivity of the OH − exchange membrane due to the neutralization by CO 2 producing HCO 3 − and CO 3 2− anions. In order to verify the effect of CO 2 on the conductivity of the QPMBV membranes, we carried out conductivity measurement before and after the CO 2 exposure. The specific experimental process is described as follows: a freshly prepared QPMBV membrane was exchanged to OH − in 6 M KOH solution in a sealed container equipped with gas inlet and outlet. N 2 gas was used to bubble the KOH solution during the entire overnight OH − exchange process. The OH − exchanged QPMBV membrane was quickly transferred to a large sealed beaker containing N 2 bubbled de-ionized water to remove the KOH. The rinsing process was repeated for a few times until the neutral pH value was reached. The conductivity was measured on the membrane soaked in the de-ionized water immediately following the rinsing process. After the conductivity (prior to CO 2 exposure) measurement, the container containing de-ionized water was exposed to the air for 12 h. Then the conductivity was measured again, which was considered as the conductivity after the exposure to the CO 2 in the ambient environment. The results will be discussed in Section 3 . 2.3 Membrane electrode assembly (MEA) and fuel cell performance The electrochemical performance of the QPMBV membrane was tested using a fuel cell test station (Arbin) at different temperatures with RH of 60%. Hydrogen and oxygen were used as the fuel and oxidant, respectively, at 80 sccm (standard cm 3 min −1 ) flow rate. MEA was prepared as follow: a mixture of 30 wt.% polytetrafluoroethylene (PTFE, suspension in de-ionized water) and 70 wt.% carbon black was brushed onto one side of a piece of carbon cloth, which was heated to 340 °C for 30 min. Catalyst Pt/C (20/80 wt.%) was sprayed onto the PTFE/carbon black coated carbon cloth surface. QPMBV membrane, which was soaked in 6 M KOH solution for ion exchange, was taken out and washed with de-ionized water prior to MEA assembly. The QPMBV membrane was sandwiched by two pieces of catalyst-loaded carbon cloth using a hydraulic press. Catalyst loading amount was 1.0 mg cm −2 (based on Pt), and the surface area of MEA was 5 cm 2 . The fuel cell was charged and discharged on an Arbin fuel cell test station between open circuit potential and 0.1 V at 5 mV s −1 . 3 Results and discussion 3.1 Copolymer characterization GPC results of the obtained PMBV with different monomer molar ratios are shown in Fig. 2 . MWs and PDIs of the copolymers are listed in Table 1 . All three samples have MWs on the order of 10 5 g mol −1 and PDIs of about 3. The T g of all obtained PMBV copolymers were around 40 °C, as indicated in Fig. 3 . 1 H NMR tests were performed to obtain the exact composition of the obtained PMBV copolymers, as shown in the representative spectra in Fig. 4 . Chemical shifts ( δ ppm) of 4.538 (s, 2H, –CH 2 Cl in VBC) [36] , 3.983 (s, 2H, –OCH 2 – in BA) [37,38] and 3.588 (t, 3H, –OCH 3 in MMA) [37,38] are the characteristic peaks for VBC, BA and MMA, respectively. The molar ratio of components in the copolymer can be calculated from the integrals of the corresponding characteristic peaks. The copolymer compositions calculated from 1 H NMR results are listed in Table 1 . From Table 1 , it can be seen that BA incorporation in all three copolymers are similar, but considerably lower than their percentages in the reactants mixture. One possible explanation is that the reactivity ratio of BA is much lower than that of MMA and VBC [39,40] in this ternary monomer mixture. Therefore the incorporation of BA is unfavorable compared to copolymerization of MMA and VBC, which have comparable reactivity ratios [39,40] . As the copolymerization proceeded, it became more difficult for BA monomers to access the growing polymer chains. Therefore, when the reaction was stopped, a portion of BA monomers remained unreacted. Consequently, the percentage of VBC in the copolymers was higher than the corresponding composition in the reactant mixtures. The composition of PMBV copolymers followed the trend that higher VBC monomer composition in the reactant mixture results in higher VBC incorporation in the obtained copolymer. Therefore, the 1 H NMR results demonstrate that the composition of the PMBV copolymers can be designed by varying the monomer ratios so that the properties of the resulting QPMBV can be tailored as well. 3.2 Mechanical properties Tensile tests were performed on PMBV and QPMBV (both dry and wet) membranes at room temperature to determine the Young's modulus and the tensile strength of the membranes which are listed in Table 2 . The dry membranes refer to the ones that were completely dried in the vacuum oven and then exposed to the ambient environment during the tensile test. The wet QPMBV membranes refer to the ones that were dried on the vacuum oven and then immersed in de-ionized water for 20 min prior to tensile test. The water uptakes of wet QPMBVs are listed in Table 3 along with other main properties of the QPMBV membranes. Fig. 5 shows the stress–strain curves of dry PMBV membranes and Fig. 6 illustrates the stress–strain performance of QPMBV membranes in dry and wet environment. Young's modulus is the slope of the initial linear portion of the stress–strain curve and represents the stiffness of the material, while tensile strength is the ultimate stress before the membrane fractures [41] . For the dry PMBV membranes ( Fig. 5 ), Young's modulus increases with increasing VBC composition in the copolymer. Therefore, PMBV-1 is the stiffest membrane and fractured at an elongation of 5%. PMBV-3 is the most ductile membrane of these three, as it has the lowest Young's modulus and tensile strength. VBC is more rigid than MMA, since the benzyl group in VBC has a large steric hindrance. Therefore, stiffness of dry copolymers increases with the increase in VBC composition. Compared to the PMBV membranes, the corresponding dry QPMBV membranes have lower Young's modulus and lower tensile strength. This observation suggests that the QPMBV copolymer slightly lost mechanical property during quaternization process, which is consistent with the ionomer nature of QPMBV. Like dry PMBV, stiffness of dry QPMBV copolymers increases with the increasing VBC composition. Young's moduli of the dry QPMBV membranes are comparable to that for dry Nafion used in PEMFC (300 MPa) [42] . The tensile strengths of the dry QPMBV membranes with different compositions remain close, meanwhile the elongation before fracture decreases with increasing VBC composition. Since AFC operates in wet condition, the properties of wet QPMBV are more important to achieve high fuel cell performance and long durability. Interestingly, after immersing the QPMBV membranes in de-ionized water for 20 min, completely opposite behaviors were observed in wet QPMBV membranes (as shown in Fig. 6 ), i.e. tensile strength decreases and elongation increases with increasing VBC composition. This is because quaternized VBC is hydrophilic so that higher VBC composition led to absorb more water as indicated in Table 3 . On the other hand, MMA and BA portions of the copolymer still sustain reasonable mechanical properties of the membranes after wetting. The mechanical properties of wet QPMBV membranes increased with higher composition of MMA and BA with sacrificing ionic conductivity and vice versa. Therefore, a balance must be achieved to synthesize QPMBV membranes which have both high mechanical property and high ionic conductivity in wet condition through tuning the composition of QPMBV. 3.3 Conductivity measurement The ion-exchange capacities of three OH − exchanged membranes (denoted as QPMBV-1, QPMBV-2 and QPMBV-3 with 26, 17 and 7 mol.% VBC composition, respectively) are listed in Table 3 . The increased ion-exchange capacity is consistent with the increasing VBC composition. Fig. 7 shows the anion conductivities of OH − exchanged QPMBV membranes at various temperatures at 80% relative humidity. Increase in conductivity was observed when temperature was increased. Among three membranes, QPMBV-1 has the best conductivity due to the highest composition of quaternized VBC groups. QPMBV-1 membrane could reach a maximum conductivity of 8.2 × 10 −3 S cm −1 at 80 °C due to the high amount of water uptake. Although the high water uptake can enhance ionic conductivity, it also has detrimental effect on mechanical property and durability. The goal of anon conducting membrane is a material with high conductivity at minimum water uptake. It has been well recognized that CO 2 may have significant impact on the anion conductivity of the OH − exchange memebrane due to the neutralization reaction to produce HCO 3 − and CO 3 2− anions. Table 4 shows our measurement of the conductivities of OH − exchanged QPMBV membranes before and after CO 2 exposure at fully water-saturated state. The distinct difference between these two sets of conductivities indicates the strong effect of CO 2 on QPMBV membrane conductivity, which is in good agreement with the previously reported results by Yanagi and Fukuta [32] and Filpi et al. [33] . Therefore, it suggested that the anion conductivities presented in Fig. 7 and Table 3 may be the overall conductivities of OH − , HCO 3 − and CO 3 2− anions. Combining the results of mechnical properties and conductivity, it is clear that higher VBC composition resulted in higher OH − conductivity, however, also impairing the mechnical properties of the membrane in the humidified working condition. The key is the mechanical property functional groups in the copolymer, MMA and BA, can provide physical strength to enble the QPMBV membranes to work in the fuel cell. 3.4 Fuel cell performance test The performance of three OH − exchanged QPMBV electrolyte membranes in AFC was measured using the Arbin fuel cell test station. AFC polarization curves were obtained by potential scan at the rate of 5 mV s −1 from OPC (1.00 V) down to 0.1 V. Fig. 8 shows the polarization curves of the three OH − exchanged QPMBV membranes at 60 °C in RH of 60%. As shown in Fig. 8 , the performance of the membranes improved as the VBC composition increased in the copolymers. The enhanced performance is attributed to both the low ohmic resistance and high efficiency of catalyst due to the increased quaternized VBC composition. All three membranes have the same thickness ( Table 3 ) so that the thickness effect on resistance can be eliminated. The peak power density of membrane QPMBV-1 was 35 mW cm −2 when current density was 80 mA cm −2 and voltage was 0.44 V. These results are consistent with the conductivity results as described previously. QPMBV-1 membrane had the highest VBC incorporation (26 mol.%) so that it had the highest OH − conductivity, thus resulting in the best AFC performance among these three membranes. The temperature dependence of OH exchanged QPMBV electrolyte membrane fuel cells was also determined by changing the cell temperature from 40 to 80 °C. Fig. 9 shows the AFC performances of OH − exchanged QPMBV-1 membrane at different temperatures with the same RH of 60%. As expected, performances improved as temperature increased. At 80 °C, the maximum current density was 180 mA cm −2 while peak power density reached 59 mW cm −2 . Recently, Yanagi and Fukuta [32] reported a series of anion-exchange membranes with extraordinary properties at ambient temperature such as 1.7 mmol g −1 ion-exchange capacity and 40 mS cm −1 OH − conductivity with only 25% water uptake. Although the conductivity and fuel cell performance of QPMBV are still lower than that of the anion-exchange membranes developed by Yanagi and Fukuta [32] , it demonstrated a new route to synthesizing a novel anion-exchange membrane. The QPMBV membrane fuel cell reported here, although it is a prototype, represents an important advancement in the development of fuel cell membranes. The fuel cell performance reported here can be largely improved if DMF-dissolved ionomer solution is mixed into the catalyst layer during preparation of the anode and cathode. 4 Conclusion Successful synthesis of proof-of-concept AFC polyelectrolytes based on a ternary copolymer, namely poly(methyl methacrylate- co -butyl acrylate- co -vinylbenzyl chloride), was reported. The purpose of this study was to demonstrate the feasibility of obtaining desired AFC electrolytes through specific monomer selections and a designed synthesis procedure. All three monomers used in the study were selected based on their unique functionalities, and the synthesis was intentionally designed to reflect the effects of different recipes on membrane mechanical and electrochemical properties. As-prepared membranes demonstrated very promising AFC performance. Although the membrane properties are not as good as the best-reported anion-exchange membranes, the results of this study clearly demonstrated that the trend of membrane properties was well controlled by the researchers’ intentions. Therefore, this study brought a new concept to produce AFC polyelectrolytes by well-designed polymerization of specifically selected monomers. Guided by this concept, AFC polyelectrolytes based on novel comb-like structured copolymers are currently under investigation by the authors. Acknowledgements The authors gratefully acknowledge the supports of this project by Office of Naval Research ( N000140810717 ), Army Research Lab ( W911NF0920007 ), and Army Research Office ( W911NF0910028 ). References [1] G.F. MacLean T. Niet S. Prince-Richard N. Djilali Int. J. Hydrogen Energy 27 2002 507 526 [2] B.Y.S. Lin D.W. Kirj S.J. Thorpe J. Power Sources 161 2006 474 483 [3] J.R. Varcoe R.C.T. Slade Fuel Cells 5 2005 187 200 [4] Y. Wu C. Wu F. Yu T. Xu Y. Fu J. Membr. Sci. 307 2008 28 36 [5] N. Tzanetakis J.R. Varcoe R.C.T. Slade K. Scott Desalination 174 2005 257 265 [6] T.N. Danks R.C.T. Slade J.R. Varcoe J. Mater. Chem. 13 2003 712 721 [7] H. Herman R.C.T. Slade J.R. Varcoe J. Membr. Sci. 218 2003 147 163 [8] J.R. Varcoe R.C.T. Slade Electrochem. Commun. 8 2006 839 843 [9] J.R. Varcoe R.C.T. Slade E.H.H. Yee S.D. Poynton D.J. Driscoll J. Power Sources 173 2007 194 199 [10] J.R. Varcoe PCCP 9 2007 1479 1486 [11] E. Agel J. Bouet J.F. Fauvarque J. 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Phys. 44 2006 2327 2345", "keywords": [ "copolymerization", "ionic conductivity" ], "authors": [ { "name": "Yanting Luo", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Juchen Guo", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Deryn Chu", "org": "Sensors and Electron Device Directorate, U.S. Army Research Laboratory, Adelphi, MD 20783, United States" } ], "venue": "Journal of Power Sources", "year": 2010 }, "TDatoKCw": { "id": "TDatoKCw", "title": "A porous silicon–carbon anode with high overall capacity on carbon fiber current collector", "abstract": "A porous silicon–carbon anode on a lightweight carbon fiber current collector is reported here for lithium-ion batteries. This Si–C anode was synthesized through a one-step carbonization of a Si-poly(acrylonitrile- co -methyl acrylate) precursor, which was directly deposited on a carbon fiber mat. The carbon fiber curent collector allows higher loading of active materials, resulting in high energy to mass and area ratios. The obtained Si–C electrode demonstrated superior overall capacity, cyclability, and rate capacity.", "keywords": [ "lithium-ion battery", "porous", "carbon fiber", "silicon anode" ], "authors": [ { "name": "Juchen Guo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Ann Sun", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Electrochemistry Communications", "year": 2010 }, "4bG6RR5z": { "id": "4bG6RR5z", "title": "Rational Designed Mixed-Conductive Sulfur Cathodes for All-Solid-State Lithium Batteries.", "abstract": "All-solid-state lithium-sulfur batteries (ASSLSBs) hold great promise for safe and high-energy-density energy storage. However, developing high-performance sulfur cathodes has been proven difficult due to low electronic and ionic conductivities and large volume change of sulfur during charge and discharge. Here, we reported an approach to synthesize sulfur cathodes with a mixed electronic and ionic conductivity by infiltrating a solution consisting of Li3PS4 (LPS) solid electrolyte and S active material into a mesoporous carbon (CMK-3). This approach leads to a uniform dispersion of amorphous Li3PS7 (L3PS) catholyte in an electronically conductive carbon matrix, enabling high and balanced electronic/ionic conductivities in the cathode composite. The inherent porous structure of CMK-3 also helps to accommodate the strain/stress generated during the expansion and shrinkage of the active material. In sulfide-based all-solid-state batteries with Li metal as the anode, this cathode composite delivered a high capacity of 1025 mAh g-1 after 50 cycles at 60 oC at 1/8 C. This work highlights the important role of high and balanced electronic and ionic conductivities in developing high-performance sulfur cathodes for ASSLSBs.", "keywords": "", "authors": [ { "name": "Jie Yue", "org": "" }, { "name": "Yonglin Huang", "org": "" }, { "name": "Sufu Liu", "org": "" }, { "name": "Ji Chen", "org": "" }, { "name": "Fudong Han", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "ACS applied materials & interfaces", "year": 2020 }, "OfdVNCNz": { "id": "OfdVNCNz", "title": "How Solid-Electrolyte Interphase Forms in Aqueous Electrolytes", "abstract": "Solid-electrolyte interphase (SEI) is the key component that enables all advanced electrochemical devices, the best representative of which is Li-ion battery (LIB). It kinetically stabilizes electrolytes at potentials far beyond their thermodynamic stability limits, so that cell reactions could proceed reversibly. Its ad hoc chemistry and formation mechanism has been a topic under intensive investigation since the first commercialization of LIB 25 years ago. Traditionally SEI can only be formed in nonaqueous electrolytes. However, recent efforts successfully transplanted this concept into aqueous media, leading to significant expansion in the electrochemical stability window of aqueous electrolytes from 1.23 V to beyond 4.0 V. This not only made it possible to construct a series of high voltage/energy density aqueous LIBs with unprecedented safety, but also brought high flexibility and even \"open configurations\" that have been hitherto unavailable for any LIB chemistries. While this new class of aqueous electrolytes has been successfully demonstrated to support diversified battery chemistries, the chemistry and formation mechanism of the key component, an aqueous SEI, has remained virtually unknown. In this work, combining various spectroscopic, electrochemical and computational techniques, we rigorously examined this new interphase, and comprehensively characterized its chemical composition, microstructure and stability in battery environment. A dynamic picture obtained reveals how a dense and protective interphase forms on anode surface under competitive decompositions of salt anion, dissolved ambient gases and water molecule. By establishing basic laws governing the successful formation of an aqueous SEI, the in-depth understanding presented in this work will assist the efforts in tailor-designing better interphases that enable more energetic chemistries operating farther away from equilibria in aqueous media. © 2017 American Chemical Society.", "keywords": [], "authors": [ { "name": "Suo Liumin", "org": "Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Beijing, China" }, { "name": "Oh Dahyun", "org": "Biomedical, Chemical and Materials Engineering Department, San José State University, San Jose, CA, United States, IBM Almaden Research Center, San Jose, CA, United States" }, { "name": "Lin Yuxiao", "org": "Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, United States" }, { "name": "Zhuo Zengqing", "org": "Advanced Light Source Lawrence Berkeley National Laboratory, Berkeley, CA, United States, School of Advanced Materials, Peking University, Peking University Shenzhen Graduate School, Shenzhen, China" }, { "name": "Borodin Oleg", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD, United States" }, { "name": "Gao Tao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, United States" }, { "name": "Wang Fei", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD, United States, Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, United States" }, { "name": "Kushima Akihiro", "org": "Department of Nuclear Science and Engineering, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States" }, { "name": "Wang Ziqiang", "org": "Department of Nuclear Science and Engineering, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States" }, { "name": "Kim Ho-Cheol", "org": "IBM Almaden Research Center, San Jose, CA, United States" }, { "name": "Qi Yue", "org": "Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, United States" }, { "name": "Yang Wanli", "org": "Advanced Light Source Lawrence Berkeley National Laboratory, Berkeley, CA, United States" }, { "name": "Pan Feng", "org": "School of Advanced Materials, Peking University, Peking University Shenzhen Graduate School, Shenzhen, China" }, { "name": "Li Ju", "org": "Department of Nuclear Science and Engineering, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States" }, { "name": "Xu Kang", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD, United States" }, { "name": "Wang Chunsheng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, United States" } ], "venue": "Journal of the American Chemical Society", "year": 2017 }, "EzTXyYMz": { "id": "EzTXyYMz", "title": "A Long-Cycle Life All-Solid-State Sodium Ion Battery.", "abstract": "All-solid-state sodium ion batteries (ASIBs) based on sulfide electrolytes are considered a promising candidate for large-scale energy storage. However, the limited cycle life of ASIBs largely restricts their practical application. Cycling-stable ASIBs can be achieved only if the designed cathode can simultaneously address challenges including insufficient interfacial contact, electrochemical and chemical instability between electrode and electrolyte, and strain/stress during operation simultaneously, rather than just address one or part of these challenges. Chevrel phase Mo6S8 has inherent high electronic conductivity and small volume change during sodiation/desodiation, and is chemically and electrochemically stabile with sulfide electrolyte, and therefore the only challenge of using Mo6S8 as cathode for ASIBs is the insufficient contact between Mo6S8 and solid electrolyte (SE). Herein, a thin layer of SE is coated on Mo6S8 using a solution method to achieve an intimate contact between Mo6S8 and SE. Such a SE-coated Mo6S8 cathode enabled an ASIB with a high cycling performance (500 cycles), even much better than that of the liquid-electrolyte batteries with Mo6S8 cathode. This work provides valuable insights for developing long-cycle life ASIBs.", "keywords": [ "all-solid-state", "sodium ion batteries", "electrode design", "interphase", "cycling stability" ], "authors": [ { "name": "Jie Yue", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiangyang Zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Luning Wang", "org": "Univ Maryland, Dept Chem & Biochem Engn, College Pk, MD 20742 USA" }, { "name": "Jian Yang", "org": "Shandong Univ, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Minist Educ, Jinan 250100, Shandong, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS applied materials & interfaces", "year": 2018 }, "Dvijv0C4": { "id": "Dvijv0C4", "title": "Thermodynamics and Kinetics of Sulfur Cathode during Discharge in MgTFSI 2 -DME Electrolyte.", "abstract": "Rechargeable magnesium/sulfur battery is of significant interest because its energy density (1700 Wh kg(-1) and 3200 Wh L-1) is among the highest of all battery chemistries (lower than Li/O-2 and Mg/O-2 but comparable to Li/S), and Mg metal allows reversible operation (100% Coulombic efficiency) with no dendrite formation. This great promise is already justified in some early reports. However, lack of mechanistic study of sulfur reaction in the Mg cation environment has severely hindered our understanding and prevents effective measures for performance improvement. In this work, the very first systematic fundamental study on Mg/S system is conducted by combining experimental methods with computational approach. The thermodynamics and reaction pathway of sulfur cathode in MgTFSI2-DME electrolyte, as well as the associated kinetics are thoroughly investigated. The results here reveal that sulfur undergoes a consecutive staging pathway in which the formation and chain-shortening of polysulfide occur at early stage accompanied by the dissolution of long-chain polysulfide, and solid-state transition from short-chain polysulfide to magnesium sulfide occurs at late stage. The former process is much faster than the latter due to the synergetic effect of the mediating effect of dissolved polysulfide and the fast diffusion of Mg ion in the amorphous intermediate.", "keywords": [ "kinetics", "magnesium battery", "reaction mechanism", "sulfur", "thermodynamics" ], "authors": [ { "name": "Tao Gao", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiaogang Li", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Chongying Yang", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Fei Wang", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Jianjun Jiang", "org": "Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China" }, { "name": "Kang Xu", "org": "US Army, Res Lab, Power & Energy Div Sensor & Electron Devices Dire, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ADVANCED MATERIALS", "year": 2017 }, "BkgY553H": { "id": "BkgY553H", "title": "In Situ Atomic‐Scale Imaging of Phase Boundary Migration in FePO4 Microparticles During Electrochemical Lithiation", "abstract": "", "keywords": [ "LiFePO4", "Lithium", "batteries", "in situ TEM", "imaging", "microparticles" ], "authors": [ { "name": "yujie zhu", "org": "university of maryland college park" }, { "name": "j w wang", "org": "university of pittsburgh" }, { "name": "yang liu", "org": "sandia national laboratories" }, { "name": "xiaohua liu", "org": "sandia national laboratories" }, { "name": "akihiro kushima", "org": "massachusetts institute of technology" }, { "name": "yunhua xu", "org": "university of maryland college park" }, { "name": "scott x mao", "org": "university of pittsburgh" }, { "name": "ju li", "org": "massachusetts institute of technology" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "j y huang", "org": "sandia national laboratories" } ], "venue": "ADVANCED MATERIALS", "year": 2013 }, "WVlnmwww": { "id": "WVlnmwww", "title": "Zn/MnO2 Battery Chemistry With H+ and Zn2+ Coinsertion", "abstract": "Rechargeable aqueous Zn/MnO2 battery chemistry in a neutral or mildly acidic electrolyte has attracted extensive attention recently because all the components (anode, cathode, and electrolyte) in a Zn/MnO2 battery are safe, abundant, and sustainable. However, the reaction mechanism of the MnO2 cathode remains a topic of discussion. Herein, we design a highly reversible aqueous Zn/MnO2 battery where the binder-free MnO2 cathode was fabricated by in situ electrodeposition of MnO2 on carbon fiber paper in mild acidic ZnSO4+MnSO4 electrolyte. Electrochemical and structural analysis identify that the MnO2 cathode experience a consequent H+ and Zn2+ insertion/extraction process with high reversibility and cycling stability. To our best knowledge, it is the first report on rechargeable aqueous batteries with a consequent ion-insertion reaction mechanism.", "keywords": "", "authors": [ { "name": "Wei Sun", "org": "" }, { "name": "Fei Wang", "org": "" }, { "name": "Singyuk Hou", "org": "" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Zhaohui Ma", "org": "" }, { "name": "Tao Gao", "org": "" }, { "name": "Fudong Han", "org": "" }, { "name": "Renzong Hu", "org": "" }, { "name": "Min Zhu", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of the American Chemical Society", "year": 2017 }, "zyGvyHeZ": { "id": "zyGvyHeZ", "title": "Understanding the good kinetics of Mo$_{6}$S$_{8}$ as cathode in Mg ion batteries by key electronic states.", "abstract": "", "keywords": "", "authors": [ { "name": "Pengfei Yu", "org": "" }, { "name": "Fudong Han", "org": "" }, { "name": "Nian Zhang", "org": "" }, { "name": "Xinghui Long", "org": "" }, { "name": "X. L. Feng", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Xiaosong Liu", "org": "" }, { "name": "Zhi Liu", "org": "" }, { "name": "Cheng Wang", "org": "" } ], "venue": "Bulletin of the American Physical Society", "year": 2017 }, "T09gJQ3A": { "id": "T09gJQ3A", "title": "Unique aqueous Li-ion/sulfur chemistry with high energy density and reversibility", "abstract": "Leveraging the most recent success in expanding the electrochemical stability window of aqueous electrolytes, in this work we create a unique Li-ion/sulfur chemistry of both high energy density and safety. We show that in the superconcentrated aqueous electrolyte, lithiation of sulfur experiences phase change from a high-order polysulfide to low-order polysulfides through solid–liquid two-phase reaction pathway, where the liquid polysulfide phase in the sulfide electrode is thermodynamically phase-separated from the superconcentrated aqueous electrolyte. The sulfur with solid–liquid two-phase exhibits a reversible capacity of 1,327 mAh/(g of S), along with fast reaction kinetics and negligible polysulfide dissolution. By coupling a sulfur anode with different Li-ion cathode materials, the aqueous Li-ion/sulfur full cell delivers record-high energy densities up to 200 Wh/(kg of total electrode mass) for >1,000 cycles at ∼100% coulombic efficiency. These performances already approach that of commercial lithium-ion batteries (LIBs) using a nonaqueous electrolyte, along with intrinsic safety not possessed by the latter. The excellent performance of this aqueous battery chemistry significantly promotes the practical possibility of aqueous LIBs in large-format applications.", "keywords": [ "aqueous sulfur battery", "gel polymer electrolyte", "phase separation", "rechargeable aqueous battery", "water-in-salt" ], "authors": [ { "name": "Chongyin Yang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Liumin Suo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783;" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Wei Sun", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Zhaohui Ma", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" }, { "name": "Khalil Amine", "org": "Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783;" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740;" } ], "venue": "Proceedings of the National Academy of Sciences of the United States of America", "year": 2017 }, "hHMGOnZS": { "id": "hHMGOnZS", "title": "PEDOT Encapsulated FeOF Nanorod Cathodes for High Energy Lithium-Ion Batteries", "abstract": "Conversion-reaction cathodes can potentially double the energy density of current Li-ion batteries. However, the poor cycling stability, low energy efficiency, and low power density of conversion-reaction cathodes limit their applications for Li-ion batteries. Herein, we report a revolutionary advance in a conversion-reaction cathode by developing a core-shell FeOF@PEDOT nanorods, in which partial substitution of fluorine with oxygen in FeF3 substantially enhance the reaction kinetics and reduce the potential hysteresis, while conformal nanolayer PEDOT coating provides a roubst fast electronic connection and prevents the side reactions. The FeOF@PEDOT nanorods deliver a capacity of 560 mA h g(-1) at 10 mA g(-1) with an energy density of >1100 W h kg(-1), which is more than two times higher than the theoretical energy density of LiCoO2. The FeOF@PEDOT nanorods can maintain a capacity of ~430 mA h g(-1) at 50 mA g(-1) (840 W h kg(-1)) for over 150 cycles with capacity decay rate of only 0.04% per cycle, which is 2 orders of magnitude lower than the capacity decay rate ever reported among all conversion-reaction cathodes. Detailed characterizations were conducted to identify the structure and mechanism responsible for these significant improvements that could translate into a Li-ion cell with a 2× increase in energy density.", "keywords": [ "Cathode material", "FeOF", "PEDOT", "conversion reaction" ], "authors": [ { "name": "xiulin fan", "org": "" }, { "name": "chao luo", "org": "" }, { "name": "julia lamb", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "kang xu", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Nano letters", "year": 2015 }, "i7nhvalM": { "id": "i7nhvalM", "title": "Mn3O4 hollow spheres for lithium-ion batteries with high rate and capacity", "abstract": "", "keywords": [], "authors": [ { "name": "guoqiang jian", "org": "university of maryland college park" }, { "name": "yunhua xu", "org": "university of maryland college park" }, { "name": "lichung lai", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "michael r zachariah", "org": "university of maryland college park" } ], "venue": "Journal of Materials Chemistry", "year": 2014 }, "dyXVxiJf": { "id": "dyXVxiJf", "title": "Galvanostatic Intermittent Titration Technique for Phase-Transformation Electrodes", "abstract": "", "keywords": [], "authors": [ { "name": "Yujie Zhu", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of Physical Chemistry C", "year": 2010 }, "JDueiIIZ": { "id": "JDueiIIZ", "title": "Expanded graphite as superior anode for sodium-ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "yang wen", "org": "" }, { "name": "kai he", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "fudong han", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "isamu matsuda", "org": "" }, { "name": "yoshitaka ishii", "org": "" }, { "name": "john cumings", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Nature Communications", "year": 2014 }, "ti7PTfyu": { "id": "ti7PTfyu", "title": "Non-flammable electrolyte enables Li-metal batteries with aggressive cathode chemistries.", "abstract": "Rechargeable Li-metal batteries using high-voltage cathodes can deliver the highest possible energy densities among all electrochemistries. However, the notorious reactivity of metallic lithium as well as the catalytic nature of high-voltage cathode materials largely prevents their practical application. Here, we report a non-flammable fluorinated electrolyte that supports the most aggressive and high-voltage cathodes in a Li-metal battery. Our battery shows high cycling stability, as evidenced by the efficiencies for Li-metal plating/stripping (99.2%) for a 5 V cathode LiCoPO (~99.81%) and a Ni-rich LiNiMnCoO cathode (~99.93%). At a loading of 2.0 mAh cm, our full cells retain ~93% of their original capacities after 1,000 cycles. Surface analyses and quantum chemistry calculations show that stabilization of these aggressive chemistries at extreme potentials is due to the formation of a several-nanometre-thick fluorinated interphase.", "keywords": "", "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA." }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Chongyin Yang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA." }, { "name": "Sz-Chian Liou", "org": "Maryland Nanocenter, University of Maryland, College Park, MD, USA." }, { "name": "Khalil Amine", "org": "Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL, USA. amine@anl.gov." }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD, USA. conrad.k.xu.civ@mail.mil." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA. cswang@umd.edu." } ], "venue": "Nature nanotechnology", "year": 2018 }, "BIQomoW1": { "id": "BIQomoW1", "title": "A High-Energy-Density Rechargeable Mg Battery Enabled by Displacement Reaction.", "abstract": "Due to high theoretical volumetric capacity and dendrite-free stripping/plating of Mg, rechargeable magnesium batteries (RMBs) hold great promise for high energy density in consumer electronics. However, lack of high-energy-density cathodes severely constrains their practical applications. Herein, for the first time, we report that a CuS cathode can fully reversibly work through displacement reaction in CuS/Mg pouch cells at room temperature and provide a high capacity of ~400 mA h/g in MACC electrolyte, corresponding to the gravimetric energy density of 608 Wh/kg and volumetric energy density of 1042 Wh/L. Even after 80 cycles, CuS/Mg pouch cells can maintain a high capacity of 335 mA h/g. Details mechanistic studies reveal CuS undergoes a displacement reaction route rather than typical conversion mechanism. This work will provide guide for more discovery of high-performance cathode candidates for RMBs.", "keywords": "", "authors": [ { "name": "Minglei Mao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Zengxi Wei", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Jianmin Ma", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "Nano letters", "year": 2019 }, "TYQxgJQF": { "id": "TYQxgJQF", "title": "TOBACCO MOSAIC VIRUS-SUPPORTED SILICON ANODE FOR LITHIUM- ION BATTERIES", "abstract": "", "keywords": [], "authors": [ { "name": "xilin chen", "org": "" }, { "name": "konstantinos gerasopoulos", "org": "" }, { "name": "juchen guo", "org": "" }, { "name": "reza ghodssi", "org": "" }, { "name": "james n culver", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "", "year": 2009 }, "QNQzL68K": { "id": "QNQzL68K", "title": "Fluorinated solid electrolyte interphase enables highly reversible solid-state Li metal battery.", "abstract": "Solid-state electrolytes (SSEs) are receiving great interest because their high mechanical strength and transference number could potentially suppress Li dendrites and their high electrochemical stability allows the use of high-voltage cathodes, which enhances the energy density and safety of batteries. However, the much lower critical current density and easier Li dendrite propagation in SSEs than in nonaqueous liquid electrolytes hindered their possible applications. Herein, we successfully suppressed Li dendrite growth in SSEs by in situ forming an LiF-rich solid electrolyte interphase (SEI) between the SSEs and the Li metal. The LiF-rich SEI successfully suppresses the penetration of Li dendrites into SSEs, while the low electronic conductivity and the intrinsic electrochemical stability of LiF block side reactions between the SSEs and Li. The LiF-rich SEI enhances the room temperature critical current density of LiPS to a record-high value of >2 mA cm. Moreover, the Li plating/stripping Coulombic efficiency was escalated from 88% of pristine LiPS to more than 98% for LiF-coated LiPS. In situ formation of electronic insulating LiF-rich SEI provides an effective way to prevent Li dendrites in the SSEs, constituting a substantial leap toward the practical applications of next-generation high-energy solid-state Li metal batteries.", "keywords": "", "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." }, { "name": "Xiao Ji", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China." }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." }, { "name": "Jie Yue", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." }, { "name": "Jianjun Jiang", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA." } ], "venue": "Science advances", "year": 2018 }, "ERcxfHZl": { "id": "ERcxfHZl", "title": "Elemental Sulfur as a Cathode Additive for Enhanced Rate Capability of Layered Lithium Transition Metal Oxides", "abstract": "", "keywords": "", "authors": [ { "name": "Sheng S. Zhang", "org": "" }, { "name": "Ji Chen", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2019 }, "AIbLmB68": { "id": "AIbLmB68", "title": "Water-Pillared Sodium Vanadium Bronze Nanowires for Enhanced Rechargeable Magnesium Ion Storage.", "abstract": "Owing to the advantages of high safety, low cost, high theoretical volumetric capacities, and environmental friendliness, magnesium-ion batteries (MIBs) have more feasibility for large-scale energy storage compared to lithium-ion batteries. However, lack of suitable cathode materials due to sluggish kinetics of magnesium ion is one of the biggest challenges. Herein, water-pillared sodium vanadium bronze nanowires (Na V O ·1.63H O) are reported as cathode material for MIBs, which display high performance in magnesium storage. The hydrated sodium ions provide excellent structural stability. The charge shielding effect of lattice water enables fast Mg diffusion. It exhibits high specific capacity of 175 mAh g , long cycle life (450 cycles), and high coulombic efficiency (≈100%). At high current density of 200 mA g , the capacity retention is up to 71% even after 450 cycles (compared to the highest capacity), demonstrating excellent long-term cycling performance. The nature of charge storage kinetics is explored. Furthermore, a highly reversible structure change during the electrochemical process is proved by comprehensive electrochemical analysis. The remarkable electrochemical performance makes Na V O ·1.63H O a promising cathode material for low-cost and safe MIBs.", "keywords": [ "cathodes", "magnesium-ion batteries", "nanowires", "sodium vanadium bronze" ], "authors": [ { "name": "Ruimin Sun", "org": "State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China." }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Chao Luo", "org": "Department of Chemistry and Biochemistry, George Mason University, Fairfax, VA, 22030, USA." }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Ping Hu", "org": "State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China." }, { "name": "Xiangjun Pu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Longsheng Cao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Liqiang Mai", "org": "State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." } ], "venue": "Small (Weinheim an der Bergstrasse, Germany)", "year": 2020 }, "wlpeVBB0": { "id": "wlpeVBB0", "title": "Roll-to-roll fabrication of organic nanorod electrodes for sodium ion batteries", "abstract": "Organic electroactive materials derived from biomasses are promising candidates for next generation rechargeable batteries due to the low cost, sustainability and environmental benignity. Since organic materials have very low electronic conductivity, they are normally synthesized into nano-scale and mixed with conductive carbon before electrode fabrication. Herein, we first reported a unique role-to-role fabrication technology by taking advantage of the high solubility of organic materials in water. The synthetic process of nano-size organic materials is merged into the organic electrode fabrication process. 2,5-Dihydroxy-1,4-benzoquinone disodium salt (DHBQDS) is used as a model, and the DHBQDS nanorod electrode is in situ formed by precipitating DHBQDS nanorods from DHBQDS–sodium alginate–carbon black aqueous slurry film on a Cu current collector during electrode drying process. Due to the fast ionic and electronic conductivity of DHBQDS–carbon nanocomposite, the DHBQDS nanorod electrodes deliver a reversible capacity of 167 mA h g−1 at a high current density of 200 mA g−1 after 300 cycles, which is 87% of its initial capacity (capacity decay rate of 0.051% per cycle). To reduce the dissolution of DHBQDS in the electrolyte upon cycling, a thin layer of Al2O3 with thickness of 1 nm or 2 nm is coated on the DHBQDS nanorod electrodes using atomic layer deposition (ALD). The Al2O3 coating remarkably suppresses the dissolution of DHBQDS nanorods as evidenced by the increased Coulombic efficiency from 94% to ~100% at a low current density of 50 mA g−1. The reversible capacity of Al2O3 coated DHBQDS nanorod electrodes remains at 212 mA h g−1 after 300 cycles with a very low capacity decay rate of 0.049% per cycle. The ALD enhanced organic nanorods exhibit the best reversible capacity and cycle life among the organic electrodes reported for Na-ion batteries.", "keywords": [ "Organic electrode", "Na-ion batteries", "Anode", "Nanorod", "Roll-to-roll fabrication" ], "authors": [ { "name": "chao luo", "org": "" }, { "name": "jingjing wang", "org": "" }, { "name": "xiulin fan", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "fudong han", "org": "" }, { "name": "liumin suo", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Nano Energy", "year": 2015 }, "NtdXVbPu": { "id": "NtdXVbPu", "title": "Electrolyte design for Li metal-free Li batteries", "abstract": "Abstract Li metal, with the lowest thermodynamically achievable negative electrochemical potential and the highest specific capacity (3860 mAh g−1), is the ultimate anode choice for Li batteries. However, the highest reported Li plating/stripping Coulombic efficiency (CE) of 99.5% after extensive efforts is still too low for the Li metal-free (all the Li metal in cycling comes from cathode, without anode pre-lithiation) Li metal batteries. The low CE is attributed to both non-uniform Li plating/stripping on the lithiophobic Cu current collector and Li dendrite growth through lithiophilic organic–inorganic solid electrolyte interphase (SEI) formed in carbonate electrolytes. Here, we use a lithiophilic Bismuth graphite blend (Bi–Gr) substrate to replace lithiophobic Cu current collector to seed a uniform Li nucleation, and form a lithiophobic LiF-rich SEI rather than lithiophilic organic-rich SEI to suppress Li dendrite growth. Molecular dynamics simulations reveal the preferential reduction of anions in 2.0 M LiPF6 in tetrahydrofuran/2-methyl tetrahydrofuran (2.0 M LiPF6–mixTHF) electrolyte to generate LiF-rich SEI on plated Li. Bi–Gr substrate and 2.0 M LiPF6–mixTHF electrolyte enable the Li anodes to achieve a record high CE of 99.83% at a high capacity of 1.0 mAh cm−2 and current of 0.5 mA cm−2. The Bi particles serve as dispersed nucleation centers that promote uniform Li deposition with strong adhesion to the substrate to avoid dead Li, while the lithiophobic LiF-rich SEI promotes lateral Li growth and suppresses the vertical Li dendrite growth even at a high current density of 3.0 mA cm−2 and high areal capacities of 3.0 mAh cm−2. The regulation of Li nucleation and growth enables the Li metal-free LiFePO4 full cells to achieve 100 cycles at a practical areal capacity of u003e2.0 mAh cm−2. This manuscript highlights the benefits of simultaneous substrate design to improve Li nucleation and electrolyte design to promote lithiophobic SEI growth, enabling a promising and practical route Li metal-free Li metal batteries.", "keywords": "", "authors": [ { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park, MD 20740, USA" }, { "name": "Qin Li", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park, MD 20740, USA" }, { "name": "Travis P. Pollard", "org": "Battery Science Branch, Energy and Biomaterials Division, Sensors and Electron Devices Directorate, U.S. Army Combat Capabilities Development Command Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park, MD 20740, USA" }, { "name": "Oleg Borodin", "org": "Battery Science Branch, Energy and Biomaterials Division, Sensors and Electron Devices Directorate, U.S. Army Combat Capabilities Development Command Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland College Park, MD 20740, USA" } ], "venue": "Materials Today", "year": 2020 }, "V831yK8M": { "id": "V831yK8M", "title": "Uniform nano-Sn/C composite anodes for lithium ion batteries.", "abstract": "Nano-Sn/C composites are ideal anode materials for high energy and power density Li-ion batteries. However, because of the low melting point of Sn and the tendency of grain growth, especially during high temperature carbonization, it has been a significant challenge to create well-dispersed ultrasmall Sn nanoparticles within a carbon matrix. In this paper, we demonstrate an aerosol spray pyrolysis technique, as a facile and scalable method, to synthesize a nano-Sn/C composite with uniformly dispersed 10 nm nano-Sn within a spherical carbon matrix. The discharge capacity of nano-Sn/C composite sphere anodes maintains the initial capacity of 710 mAh/g after 130 cycles at 0.25 C. The nano-Sn/C composite sphere anodes can provide ~600 mAh/g even at a high rate of 20 C. To the best of our knowledge, such high rate performance for Sn anodes has not been reported previously. The exceptional performance of the nano-Sn/C composite is attributed to the unique nano-Sn/C structure: (1) carbon matrix offers mechanical support to accommodate the stress associated with the large volume change of nano-Sn, thus alleviating pulverization; (2) the carbon matrix prevents Sn nanoparticle agglomeration upon prolonged cycling; and (3) carbon network provides continuous path for Li ions and electrons inside the nano-Sn/C composite spheres.", "keywords": [], "authors": [ { "name": "Yunhua Xu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA." }, { "name": "Qing Liu", "org": "" }, { "name": "Yujie Zhu", "org": "" }, { "name": "Yihang Liu", "org": "" }, { "name": "Alex Langrock", "org": "" }, { "name": "Michael R Zachariah", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano letters", "year": 2013 }, "u9ugZ73A": { "id": "u9ugZ73A", "title": "Liquid Structure with Nano-Heterogeneity Promotes Cationic Transport in Concentrated Electrolytes", "abstract": "Using molecular dynamics simulations, small-angle neutron scattering, and a variety of spectroscopic techniques, we evaluated the ion solvation and transport behaviors in aqueous electrolytes containing bis(trifluoromethanesulfonyl)imide. We discovered that, at high salt concentrations (from 10 to 21 mol/kg), a disproportion of cation solvation occurs, leading to a liquid structure of heterogeneous domains with a characteristic length scale of 1 to 2 nm. This unusual nano-heterogeneity effectively decouples cations from the Coulombic traps of anions and provides a 3D percolating lithium–water network, via which 40% of the lithium cations are liberated for fast ion transport even in concentration ranges traditionally considered too viscous. Due to such percolation networks, superconcentrated aqueous electrolytes are characterized by a high lithium-transference number (0.73), which is key to supporting an assortment of battery chemistries at high rate. The in-depth understanding of this transport mechanism ...", "keywords": [ "aqueous electrolytes", "batteries", "molecular dynamics simulations", "spectroscopy", "conductivity" ], "authors": [ { "name": "Oleg Borodin", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Liumin Suo", "org": "Univ Chinese Acad Sci, Sch Phys Sci,Key Lab Renewable Energy, Chinese Acad Sci,Beijing Key Lab New Energy Mat &, Inst Phys,Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China" }, { "name": "Mallory Gobet", "org": "CUNY, Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA" }, { "name": "Xiaoming Ren", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Fei Wang", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Antonio Faraone", "org": "NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA" }, { "name": "Jing Peng", "org": "CUNY, Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA" }, { "name": "Marco Olguin", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Marshall A. Schroeder", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Michael S. Ding", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Eric Gobrogge", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Arthur v. Cresce", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Stephen Munoz", "org": "CUNY, Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA" }, { "name": "Joseph A. Dura", "org": "NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA" }, { "name": "Steve Greenbaum", "org": "CUNY, Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA" }, { "name": "Chunsheng Wang", "org": "Univ Chinese Acad Sci, Sch Phys Sci,Key Lab Renewable Energy, Chinese Acad Sci,Beijing Key Lab New Energy Mat &, Inst Phys,Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China" }, { "name": "Kang Xu", "org": "US Army, Res Lab, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" } ], "venue": "ACS Nano", "year": 2017 }, "oQAQxei6": { "id": "oQAQxei6", "title": "Copper‐Stabilized Sulfur‐Microporous Carbon Cathodes for Li–S Batteries", "abstract": "A copper-stabilized sulfur-microporous carbon (MC-Cu-S) composite is synthesized by uniformly dispersing 10% highly electronically conductive Cu nanoparticles into microporous carbon (MC), followed by wet-impregnating S. In the MC-Cu-S composite, the MC host that physically confines S/poly-sulfides provides free space to accommodate volumetric expansion of S during lithiation, while the Cu nanoparticles that are anchored in the MC further chemically interact with S/polysulfi des through bonding between Cu and S/polysulfi des. The Cu loading allows the S content to increase from 30 to 50% in the carbon-S cathode material without scarifying the electrochemical performance in a low-cost carbonate electrolyte. At a current density of 100 mA g(-1), the MC-Cu-S cathode shows that Coulumbic efficiency is close to 100% and capacity maintains more than 600 mAh g(-1) with progressive cycling up to more than 500 cycles. In addition, the Cu nano-inclusins also enhance the electronic conductivity of the MC-Cu-S composite, remarkably increasing the rate capabilities. Even the current density increases 10.0 A g(-1), the MC-Cu-S cathode can still deliver a capacity of 200 mAh g(-1). This strategy of stabilization of S with small amount of metal nanoparticles anchored in MC provides an effective approach to improve the cycling stability, Coulumbic efficiency, and S loading for Li-S batteries.", "keywords": [ "nanoparticles" ], "authors": [ { "name": "shiyou zheng", "org": "Shanghai Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 201800, Peoples R China" }, { "name": "feng yi", "org": "NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA" }, { "name": "zhipeng li", "org": "NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yunhua xu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "junhe yang", "org": "Shanghai Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 201800, Peoples R China" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2014 }, "FH6IICwt": { "id": "FH6IICwt", "title": "Reversible Alloying of Phosphorene with Potassium and its Stabilization using Reduced Graphene Oxide Buffer Layers.", "abstract": "High specific capacity materials that can store potassium (K) are essential for next generation K-ion batteries. One such candidate material is phosphorene (the 2D allotrope of phosphorous (P)) but the potassiation capability of phosphorene has not yet been established. Here we systematically investigate the alloying of few-layer phosphorene (FLP) with K. Unlike lithium (Li) and sodium (Na), which form Li3P and Na3P, FLP alloys with K to form K4P3, which was confirmed by ex situ x-ray characterization as well as density functional theory calculations. The formation of K4P3 results in high specific capacity (~1,200 mAh g-1) but poor cyclic stability (only ~9% capacity retention in subsequent cycles). We show that this capacity fade can be successfully mitigated by the use of reduced graphene oxide (rGO) as buffer layers to suppress the pulverization of FLP. We studied the performance of rGO and single-walled carbon nanotubes (sCNTs) as buffer materials and found that rGO being a 2D material can better encapsulate and protect FLP relative to 1D sCNTs. The half-cell performance of FLP/rGO could also be successfully reproduced in a full-cell configuration, indicating the possibility of high performance K-ion batteries that could offer a sustainable and low-cost alternative to Li-ion technology.", "keywords": [ "phosphorene anode", "potassium-ion batteries", "K4P3 alloy", "energy density", "cycle stability" ], "authors": [ { "name": "Rishabh Jain", "org": "Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" }, { "name": "Prateek Hundekar", "org": "Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Yashpal Singh", "org": "Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States" }, { "name": "Anthony Yoshimura", "org": "Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" }, { "name": "Varun Sarbada", "org": "Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" }, { "name": "Tushar Gupta", "org": "Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" }, { "name": "Aniruddha S Lakhnot", "org": "Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" }, { "name": "Sang Ouk Kim", "org": "National Creative Research#R#Initiative (CRI) Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Nikhil Koratkar", "org": "Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States" } ], "venue": "ACS nano", "year": 2019 }, "EfLzHwcf": { "id": "EfLzHwcf", "title": "A Porous Silicon-Carbon Anode with High Overall Capacity on Carbon Fiber Current Collector", "abstract": "", "keywords": [], "authors": [ { "name": "juchen guo", "org": "" }, { "name": "ann sun", "org": "" }, { "name": "ayyakkannu manivannan", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "", "year": 2010 }, "k2h7hRaw": { "id": "k2h7hRaw", "title": "Flexible Aqueous Li-Ion Battery with High Energy and Power Densities.", "abstract": "A flexible and wearable aqueous symmetrical lithium-ion battery is developed using a single LiVPO4F material as both cathode and anode in a \"water-in-salt\" gel polymer electrolyte. The symmetric lithium-ion chemistry exhibits high energy and power density and long cycle life, due to the formation of a robust solid electrolyte interphase consisting of Li2CO3-LiF, which enables fast Li-ion transport. Energy densities of 141 Wh kg(-1), power densities of 20 600 W kg(-1), and output voltage of 2.4 V can be delivered during >4000 cycles, which is far superior to reported aqueous energy storage devices at the same power level. Moreover, the full cell shows unprecedented tolerance to mechanical stress such as bending and cutting, where it not only does not catastrophically fail, as most nonaqueous cells would, but also maintains cell performance and continues to operate in ambient environment, a unique feature apparently derived from the high stability of the \"water-in-salt\" gel polymer electrolyte.", "keywords": [ "flexible battery", "gel polymer electrolyte", "rechargeable aqueous battery", "water-in-salt" ], "authors": [ { "name": "Chongyin Yang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Liumin Suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Wei Sun", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Long Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Ling Miao", "org": "Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, 1037 Luoyu Rd, Wuhan 430073, Hubei, Peoples R China" }, { "name": "Kang Xu", "org": "US Army Res Lab, Electrochem Branch, Sensor & Electron Devices Directorate, Power & Energy Div, Adelphi, MD 20783 USA" }, { "name": "Konstantinos Gerasopoulos", "org": "Johns Hopkins Univ, Appl Phys Lab, Res & Exploratory Dev Dept, Johns Hopkins Rd, Laurel, MD 20723 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ADVANCED MATERIALS", "year": 2017 }, "JbzGlg8Y": { "id": "JbzGlg8Y", "title": "Highly Fluorinated Interphases Enable High-Voltage Li-Metal Batteries", "abstract": "Summary We were able to demonstrate excellent cycling performance of Li-metal anodes in carbonate electrolytes by increasing the Li bis(fluorosulfonyl)imide (LiFSI) concentration to ∼10 M. The high concentration (10 M) of FSI anion enabled interphases of high F content on both Li-metal anode and Ni-rich NMC (nickel-manganese-cobalt) cathode surfaces. Such F-rich interphases effectively suppressed Li dendrite formation, as demonstrated by a high Li plating/stripping Coulombic efficiency of ∼99.3%, and stabilized the carbonate molecules against oxidation at high cutoff voltages of 4.6 V on the surface of LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC622). The combination of unique stabilization on both Li-metal anode and NMC622 cathodes enabled high-energy Li-metal batteries constructed on the aggressive chemistry. Under the harsh conditions of a high charge voltage of 4.6 V and high loading of 2.5 mAh/cm 2 , the NMC622||Li cells retained ∼86% of their original capacity after 100 cycles. The electrolyte strategy presented here offers unique guidelines for further optimizing beyond Li-ion chemistries.", "keywords": "", "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Ji Chen", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China" }, { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Jianjun Jiang", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" } ], "venue": "Chem", "year": 2018 }, "j4u6ZScm": { "id": "j4u6ZScm", "title": "Isotope Effect between H2O and D2O in Hydrothermal Synthesis", "abstract": "Synthetic chemists can use different solvents (for example, polar vs nonpolar) to affect solute–solvent interactions and therefore favor a particular reaction product. Using a different isotope of the same solvent to select the product, however, is uncommon. We find that water and heavy water (D2O) can select different products in the hydrothermal syntheses of iron-containing solids. Under hydrothermal and anaerobic conditions, water oxidizes iron to evolve hydrogen gas and a mixture of Fe2+- and Fe3+-containing solids. When we replace D2O for H2O under identical hydrothermal conditions, we can select thermodynamic products in our syntheses of iron-containing solids, whether it be oxides or chalcogenides. To explain this remarkable difference in product selectivity, we discover an unexpected difference in a fundamental property between H2O and D2O: their standard reduction potentials. Through electrochemical measurements and under strongly basic conditions (pH = 14), we find that the reduction potential o...", "keywords": "", "authors": [ { "name": "Xiuquan Zhou", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Luning Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Xiulin Fan", "org": "Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Brandon Wilfong", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Sz-Chian Liou", "org": "AIM Lab, Maryland NanoCenter, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Yi Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Huafei Zheng", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Zhange Feng", "org": "Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, Illinois 60439, United States" }, { "name": "Chunsheng Wang", "org": "Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Efrain E. Rodriguez", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "Chemistry of Materials", "year": 2020 }, "LPliasTg": { "id": "LPliasTg", "title": "A critical review of cathodes for rechargeable Mg batteries", "abstract": "Benefiting from a higher volumetric capacity (3833 mA h cm−3 for Mg vs. 2046 mA h cm−3 for Li) and dendrite-free Mg metal anode, reversible Mg batteries (RMBs) are a promising chemistry for applications beyond Li ion batteries. However, RMBs are still severely restricted by the absence of high performance cathodes for any practical application. In this review, we provide a critical and rigorous review of Mg battery cathode materials, mainly reported since 2013, focusing on the impact of structure and composition on magnesiation kinetics. We discuss cathode materials, including intercalation compounds, conversion materials (O2, S, organic compounds), water co-intercalation cathodes (V2O5, MnO2etc.), as well as hybrid systems using Mg metal anode. Among them, intercalation cathodes are further categorized by 3D (Chevrel phase, spinel structure etc.), 2D (layered structure), and 1D materials (polyanion: phosphate and silicate), according to the diffusion pathway of Mg2+ in the framework. Instead of discussing every published work in detail, this review selects the most representative works and highlights the merits and challenges of each class of cathodes. Advances in theoretical analysis are also reviewed and compared with experimental results. This critical review will provide comprehensive knowledge of Mg cathodes and guidelines for exploring new cathodes for rechargeable magnesium batteries.", "keywords": "", "authors": [ { "name": "Minglei Mao", "org": "" }, { "name": "Minglei Mao", "org": "" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Chemical Society Reviews", "year": 2018 }, "sB3pXCpB": { "id": "sB3pXCpB", "title": "Mesoporous carbon/silicon composite anodes with enhanced performance for lithium-ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "yunhua xu", "org": "university of maryland college park" }, { "name": "yujie zhu", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "Journal of Materials Chemistry", "year": 2014 }, "DE13kIr3": { "id": "DE13kIr3", "title": "Reversible Redox Chemistry of Azo Compounds for Sodium Ion Batteries.", "abstract": "Sustainable sodium-ion batteries (SSIBs) using renewable organic electrodes are promising alternatives to lithium-ion batteries for the large-scale renewable energy storage. However, the lack of high-performance anode material impedes the development of SSIBs. Herein, we report a new type of organic anode material based on azo group for SSIBs. Azobenzene-4,4'-dicarboxylic acid sodium salt is used as a model to investigate the electrochemical behaviors and reaction mechanism of azo compound. It exhibits a reversible capacity of 170 mAhg(-1) at 0.2C. When current density is increased to 20C, the reversible capacities of 98 mAhg(-1) can be retained for 2000 cycles, demonstrating excellent cycling stability and high rate capability. The detailed characterizations reveal that azo group acts as an electrochemical active site to reversibly bond with Na+. The reversible redox chemistry between azo compound and Na ions offer opportunities for developing longcycle-life and high-rate SSIBs.", "keywords": [ "anodes", "azo compounds", "organic electrode materials", "sodium-ion batteries" ], "authors": [ { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Gui-Liang Xu", "org": "Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Long Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "Jianjun Jiang", "org": "Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China" }, { "name": "Zonghai Chen", "org": "Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA" }, { "name": "Yang Ren", "org": "Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA" }, { "name": "Khalil Amine", "org": "Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2018 }, "g5ICiw9o": { "id": "g5ICiw9o", "title": "Azo compounds as a family of organic electrode materials for alkali-ion batteries.", "abstract": "Organic compounds are desirable for sustainable Li-ion batteries (LIBs), but the poor cycle stability and low power density limit their large-scale application. Here we report a family of organic compounds containing azo group (N=N) for reversible lithiation/delithiation. Azobenzene-4,4'-dicarboxylic acid lithium salt (ADALS) with an azo group in the center of the conjugated structure is used as a model azo compound to investigate the electrochemical behaviors and reaction mechanism of azo compounds. In LIBs, ADALS can provide a capacity of 190 mAh g at 0.5 C (corresponding to current density of 95 mA g) and still retain 90%, 71%, and 56% of the capacity when the current density is increased to 2 C, 10 C, and 20 C, respectively. Moreover, ADALS retains 89% of initial capacity after 5,000 cycles at 20 C with a slow capacity decay rate of 0.0023% per cycle, representing one of the best performances in all organic compounds. Superior electrochemical behavior of ADALS is also observed in Na-ion batteries, demonstrating that azo compounds are universal electrode materials for alkali-ion batteries. The highly reversible redox chemistry of azo compounds to alkali ions was confirmed by density-functional theory (DFT) calculations. It provides opportunities for developing sustainable batteries.", "keywords": [ "alkali-ion batteries", "azo compounds", "high power density", "organic electrode materials", "sustainable batteries" ], "authors": [ { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Sensors and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD 20783." }, { "name": "Xiao Ji", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China." }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Karen J Gaskell", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742." }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742." }, { "name": "Ruixing Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742." }, { "name": "Jianjun Jiang", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742; cswang@umd.edu." } ], "venue": "Proceedings of the National Academy of Sciences of the United States of America", "year": 2018 }, "ByJeI931": { "id": "ByJeI931", "title": "Solid-State Fabrication of SnS2/C Nanospheres for High-Performance Sodium Ion Battery Anode.", "abstract": "Tin disulfide (SnS2) has emerged as a promising anode material for sodium ion batteries (NIBs) due to its unique layered structure, high theoretical capacity, and low cost. Conventional SnS2 nanomaterials are normally synthesized using hydrothermal method, which is time-consuming and difficult to scale up for mass production. In this study, we develop a simple solid-state reaction method, in which the carbon-coated SnS2 (SnS2/C) anode materials were synthesized by annealing metallic Sn, sulfur powder, and polyacrylonitrile in a sealed vacuum glass tube. The SnS2/C nanospheres with unique layered structure exhibit a high reversible capacity of 660 mAh g(-1) at a current density of 50 mA g(-1) and maintain at 570 mAh g(-1) for 100 cycles with a degradation rate of 0.14% per cycle, demonstrating one of the best cycling performances in all reported SnS2/C anodes for NIBs to date. The superior cycling stability of SnS2/C electrode is attributed to the stable nanosphere morphology and structural integrity during charge/discharge cycles as evidenced by ex situ characterization.", "keywords": [ "anode", "cycling stability", "nanospheres", "sodium-ion batteries", "solid-state synthesis", "tin disulfide" ], "authors": [ { "name": "Jingjing Wang", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Chao Luo", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Jianfeng Mao", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Yujie Zhu", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Xiulin Fan", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Tao Gao", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Alice C Mignerey", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Chunsheng Wang", "org": "†Department of Chemistry and Biochemistry and ‡Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." } ], "venue": "ACS applied materials & interfaces", "year": 2015 }, "EiNXjEkE": { "id": "EiNXjEkE", "title": "Porous amorphous FePO4 nanoparticles connected by single-wall carbon nanotubes for sodium ion battery cathodes.", "abstract": "Sodium ion batteries (SIBs) are promising candidates for the applications of large-scale energy storage due to their cost-effective and environmental-friendly characteristics. Nevertheless, it remains a practical challenge to find a cathode material of SIBs showing ideal performance (capacity, reversibility, etc.). We report here a nanocomposite material of amorphous, porous FePO(4) nanoparticles electrically wired by single-wall carbon nanotubes as a potential cathode material for SIBs. The hydrothermally synthesized nanocomposite shows excellent cell performance with unprecedented cycling stability and reversibility. The discharge capacity of as high as 120 mAh/g is delivered at a 0.1 C rate (10 mA/g). The capacity retentions are about 70 mAh/g, 60 mAh/g, and 55 mAh/g at higher currents of 20 mA/g, 40 mA/g, and 60 mA/g, respectively. Even at a 1 C rate (100 mA/g), a capacity of about 50 mAh/g is still retained after 300 cycles. With a simple synthetic procedure, cost-effective chemicals, and desirable cell performance, this method offers a highly promising candidate for commercialized cathode materials of SIBs.", "keywords": [], "authors": [ { "name": "Yonglin Liu", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA." }, { "name": "Yunhua Xu", "org": "" }, { "name": "Xiaogang Han", "org": "" }, { "name": "Chris Pellegrinelli", "org": "" }, { "name": "Yujie Zhu", "org": "" }, { "name": "Hongli Zhu", "org": "" }, { "name": "Jiayu Wan", "org": "" }, { "name": "Alex Chong Chung", "org": "" }, { "name": "Oeyvind Vaaland", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Liangbing Hu", "org": "" } ], "venue": "Nano letters", "year": 2012 }, "Y3r8vL9y": { "id": "Y3r8vL9y", "title": "Self-Assembled Organic Nanowires for High Power Density Lithium Ion Batteries", "abstract": "", "keywords": [], "authors": [ { "name": "ruiming huang", "org": "" }, { "name": "chao luo", "org": "" }, { "name": "ruslan kevorkyants", "org": "" }, { "name": "michele pavanello", "org": "" }, { "name": "huixin he", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Nano Letters", "year": 2014 }, "fhb7eKg1": { "id": "fhb7eKg1", "title": "Author Correction: Non-flammable electrolyte enables Li-metal batteries with aggressive cathode chemistries", "abstract": "In the version of this Article originally published, in the first paragraph of the Methods, HFE was incorrectly given as 2,2,2-Trifluoroethyl-3ʹ,3ʹ,3ʹ,2ʹ,2ʹ-pentafluoropropyl ether; it should have been 1,1,2,2-tetrafluoroethyl-2ʹ,2ʹ,2ʹ-trifluoroethyl ether. This has now been corrected in the online versions of the Article.", "keywords": "", "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Sz-Chian Liou", "org": "Maryland Nanocenter, University of Maryland, College Park, USA" }, { "name": "Khalil Amine", "org": "Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" } ], "venue": "Nature Nanotechnology", "year": 2018 }, "5hQFIvSw": { "id": "5hQFIvSw", "title": "Batteries: Widening voltage windows", "abstract": "A Nature Research Journal", "keywords": "", "authors": [ { "name": "Kang Xu", "org": "Kang Xu is at the Electrochemistry Branch of the US Army Research Laboratory, Maryland 20783, USA." }, { "name": "Chunsheng Wang", "org": "Chunsheng Wang is at the Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, USA." } ], "venue": "Nature Energy", "year": 2016 }, "1NpN6cDf": { "id": "1NpN6cDf", "title": "Selenium@Mesoporous Carbon Composite with Superior Lithium and Sodium Storage Capacity", "abstract": "", "keywords": [], "authors": [ { "name": "chunsheng wang", "org": "" }, { "name": "alex langrock", "org": "" }, { "name": "ying liu", "org": "" }, { "name": "shiyou zheng", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "chao luo", "org": "" } ], "venue": "ACS Nano", "year": 2013 }, "LRhl1pdm": { "id": "LRhl1pdm", "title": "Water activated VOPO4 for magnesium ion batteries.", "abstract": "Rechargeable Mg batteries, using high capacity and dendrite-free Mg metal anodes, are promising energy storage devices for large scale smart grid due to low cost and high safety. However, the performance of Mg batteries is still plagued by the slow reaction kinetics of their cathode materials. Recent discoveries demonstrate that water in cathode can significantly enhance the Mg-ion diffusion in cathode by an unknown mechanism. Here, we propose the water-activated layered-structure VOPO4 as a novel cathode material and examine the impact of water in electrode or organic electrolyte on the thermodynamics and kinetics of Mg-ion intercalation/de-intercalation in cathodes. Electrochemical measurements verify that water in both VOPO4 lattice and organic electrolyte can largely activate VOPO4 cathode. Thermodynamic analysis demonstrates that the water in the electrolyte will equilibrate with the structural water in VOPO4 lattice and the water activity in the electrolyte alerts the mechanism and kinetics for electrochemical Mg-ion intercalation in VOPO4. Theoretical calculation and experimental results demonstrate that water reduces both the solid-state diffusion barrier in the VOPO4 electrode and the desolvation penalty at the interface. To achieve fast reaction kinetics, the water activity in the electrolyte should be larger than 10-2. The proposed activation mechanism provides guidance for screening and designing novel chemistry for high performance multivalent-ion batteries.", "keywords": "", "authors": [ { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Ji Chen", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" }, { "name": "Wei Sun", "org": "" }, { "name": "Yunjun Ruan", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China" }, { "name": "Ling Miao", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China" }, { "name": "Jianjun Jiang", "org": "School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States" } ], "venue": "Nano letters", "year": 2018 }, "QkX1DKRR": { "id": "QkX1DKRR", "title": "Sulfur-embedded FeS2 as a High-Performance Cathode for Room Temperature All-Solid-State Lithium-Sulfur Batteries.", "abstract": "All-solid-state lithium-sulfur batteries employing sulfur electrodes and solid electrolyte at room temperature is still a great challenge due to the low ionic and electronic conductivities of sulfur cathodes. In this work, we report room temperature all-solid-state lithium-sulfur batteries by using thin sulfur layer embedded FeS2 (FeS2@S) microsphere composites as active materials in FeS2@S-Li10GeP2S12-Super P cathodically electrode. Setting the cut-off voltage between 1.5 - 2.8V, only lithiation/delithiation reactions between Li2FeS2 and FeSy and direct reaction between Li2S and S will occur, which avoid large volume change of FeS2 caused by the conversion reaction, leading to the structure integrity of FeS2@S. The resultant batteries exhibit excellent rate capability and cycling stability, showing specific capacities of 1120.9, 937.2, 639.7, 517.2, 361.5, and 307.0 mAh g-1 for FeS2@S composite cathode, corresponding to the normalized capacities of 1645.5, 1252.9, 782.5, 700.2, 478.4 and 363.6 mAh g-1 for sulfur at 30, 50, 100, 500, 1000 and 5000 mA g-1, respectively. Besides, it can retain the normalized capacity of 430.7 mAh g-1 for sulfur at 1000 mA g-1 after 200 cycles at room temperature.", "keywords": [ "all-solid-state lithium-sulfur battery", "stable interface", "electronic/ionic conduction", "sulfur-embedded FeS2", "electrochemical performance" ], "authors": [ { "name": "Jean Pierre Mwizerwa", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, P. R. China." }, { "name": "Qiang Zhang", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, P. R. China." }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Hongli Wan", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, P. R. China." }, { "name": "Liangting Cai", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, P. R. China." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Xiayin Yao", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, P. R. China." } ], "venue": "ACS applied materials & interfaces", "year": 2020 }, "G7cM6aHW": { "id": "G7cM6aHW", "title": "Designing In-Situ-Formed Interphases Enables Highly Reversible Cobalt-Free LiNiO2 Cathode for Li-ion and Li-metal Batteries", "abstract": "", "keywords": "", "authors": [ { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Longsheng Cao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Shuang Li", "org": "Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Xiuquan Zhou", "org": "Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA" }, { "name": "Enyuan Hu", "org": "Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Dong Su", "org": "Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Xiao-Qing Yang", "org": "Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" } ], "venue": "Joule", "year": 2019 }, "aLTJpHmZ": { "id": "aLTJpHmZ", "title": "Long cycle life of sodium-ion pouch cell achieved by using multiple electrolyte additives", "abstract": "Abstract Sodium-ion pouch cells with up to 1000 cycles are presented by using a NaNi 1/3 Fe 1/3 Mn 1/3 O 2 cathode, a hard carbon anode, and a functional electrolyte. The functional electrolyte is composed of 1 M NaPF 6 dissolved in a 1:1 (v/v) mixed solvent of propylene carbonate (PC) and ethyl methyl carbonate (EMC) with 3–4 wt% of two or three additives, including fluoroethylene carbonate (FEC), prop-1-ene-1,3-sultone (PST), and 1,3,2-Dioxathiolane-2,2-dioxide (DTD). It is shown that the capacity retentions of the cells increase to 84.4% and 92.2% after 1000 cycles for electrolytes containing FEC-PST bi-additive and FEC-PST-DTD tri-additive, respectively, as compared with that containing FEC single additive. Using X-ray photoelectron spectroscopy, inductively coupled plasma optical, and transmission electron microscopy, post-mortem analyses on the surface of the cycled electrodes indicate that PST and DTD are beneficial to the anode by forming an organic compound rich solid electrolyte interphase (SEI), and to the cathode by forming a dense and thick cathode electrolyte interphase (CEI) that consequently prevents transition metal ions from dissolving into electrolyte.", "keywords": "", "authors": [ { "name": "Haiying Che", "org": "Shanghai Electrochemical Energy Devices Research Center, Department of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China" }, { "name": "Xinrong Yang", "org": "Shanghai Electrochemical Energy Devices Research Center, Department of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China" }, { "name": "Hong Wang", "org": "" }, { "name": "Sheng S. Zhang", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD, 20783, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20740, USA" }, { "name": "Zi-Feng Ma", "org": "Shanghai Electrochemical Energy Devices Research Center, Department of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China" } ], "venue": "Journal of Power Sources", "year": 2018 }, "k2SIXTOn": { "id": "k2SIXTOn", "title": "Reactivation of dissolved polysulfides in Li–S batteries based on atomic layer deposition of Al2O3 in nanoporous carbon cloth", "abstract": "This work demonstrates the effect of atomic layer deposited (ALD) Al2O3 on the reactivation of dissolved polysulfides in Li–S batteries. A 0.5 nm thick layer of Al2O3 is conformally coated onto highly porous carbon cloth by ALD, and then assembled in a Li–S battery between the sulfur cathode and the anode side (separator and Li anode) to function as a reactivation component. Compared to half cells with no ALD treatment, the ultrathin Al2O3 coating increases the specific discharge capacity by 25% from 907 to 1136 mA h/g at the 1st cycle, and by 114% from 358 to 766 mA h/g at the 40th cycle. Thus the ALD-Al2O3 improves the initial specific capacity and stabilizes the cycle life remarkably. Scanning electron microscopy and energy-dispersive X-ray spectroscopy results indicate that the ALD-Al2O3 coated carbon cloth sorbs (adsorbs/absorbs) more dissolved sulfur species from the electrolyte. Potential mechanisms for the improved sorption properties are proposed. The combination of an ultrathin ALD-oxide coating with highly porous carbons presents a new strategy to improve the performance of Li–S batteries.", "keywords": [ "Al2O3", "Atomic layer deposition", "Li–S battery", "Porous carbons", "Sulfur chemistry" ], "authors": [ { "name": "Xiaogang Han", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Yunhua Xu", "org": "Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742, United States;" }, { "name": "Xinyi Chen", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Yu-Chen Chen", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Nicholas Weadock", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Jiayu Wan", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Hongli Zhu", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Yonglin Liu", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Heqin Li", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Gary Rubloff", "org": "Department of Materials Science and Engineering, United States;" }, { "name": "Chunsheng Wang", "org": "Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742, United States;" }, { "name": "Liangbing Hu", "org": "Department of Materials Science and Engineering, United States;" } ], "venue": "Nano Energy", "year": 2013 }, "gL6rEunZ": { "id": "gL6rEunZ", "title": "A Patterned 3D Silicon Anode Fabricated by Electrodeposition on a Virus‐Structured Current Collector", "abstract": "Electrochemical methods were developed for the deposition of nanosilicon onto a 3D virus-structured nickel current collector. This nickel current collector is composed of self-assembled nanowire-like rods of genetically modified tobacco mosaic virus (TMV1cys), chemically coated in nickel to create a complex high surface area conductive substrate. The electrochemically deposited 3D silicon anodes demonstrate outstanding rate performance, cycling stability, and rate capability. Electrodeposition thus provides a unique means of fabricating silicon anode materials on complex substrates at low cost.", "keywords": [ "tobacco mosaic virus" ], "authors": [ { "name": "xilin chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "konstantinos gerasopoulos", "org": "Univ Maryland, Dept Mat Sci & Engn, Syst Res Inst, Dept Elect & Comp Engn, College Pk, MD 20742 USA" }, { "name": "juchen guo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "adam brown", "org": "Univ Maryland, Inst Biosci & Biotechol Res, Dept Plant Sci & Landscape Architecture, College Pk, MD 20742 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "reza ghodssi", "org": "Univ Maryland, Dept Mat Sci & Engn, Syst Res Inst, Dept Elect & Comp Engn, College Pk, MD 20742 USA" }, { "name": "james n culver", "org": "Univ Maryland, Inst Biosci & Biotechol Res, Dept Plant Sci & Landscape Architecture, College Pk, MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2011 }, "di22zbQj": { "id": "di22zbQj", "title": "How Solid-Electrolyte-Interphase Forms in Aqueous Electrolytes.", "abstract": "Solid-electrolyte-interphase (SEI) is the key component that enables all advanced electrochemical devices, the best representative of which is Li-ion battery (LIB). Its kinetically stabilizes electrolytes at potentials far beyond their thermodynamic stability limits, so that cell reactions could proceed reversibly, and its ad hoc chemistry and formation mechanism has been a topic under intensive investigation since the first commercialization of LIB 25 years ago. Traditionally SEI can only be formed in non-aqueous electrolytes. However, recent efforts successfully transplanted this concept into aqueous media, leading to significant expansion in the electrochemical stability window of aqueous electrolytes from 1.23 V to beyond 4.0 V. Such groundbreaking electrolytes not only made it possible to construct a series of high voltage/energy density aqueous LIBs with unprecedented safety, but also brought high flexibility and even \"open configurations\" that have been hitherto unavailable for any LIB chemistries. While this new class of aqueous electrolytes has been successfully demonstrated to support diversified battery chemistries, the chemistry and formation mechanism of the key component, an aqueous SEI, has remained virtually unknown. In this work, combining various spectral, electrochemical and computational techniques, we rigorously examined this new interphase, and comprehensively characterized its chemical composition, micro-structure and stability in battery environment. A dynamic picture obtained reveals how a dense and protective interphase forms on anode surface under competitive decompositions of salt anion, dissolved ambient gases and water molecule. By establishing basic laws governing the successful formation of an aqueous SEI, the in-depth understanding presented in this work will assist the efforts in tailor-designing better interphases that enable more energetic chemistries operating farther away from equilibria in aqueous media.", "keywords": "", "authors": [ { "name": "Liumin Suo", "org": "" }, { "name": "Dahyun Oh", "org": "" }, { "name": "Yuxiao Lin", "org": "" }, { "name": "Zengqing Zhuo", "org": "" }, { "name": "Oleg Borodin", "org": "" }, { "name": "Tao Gao", "org": "" }, { "name": "Fei Wang", "org": "" }, { "name": "Akihiro Kushima", "org": "" }, { "name": "Ziqiang Wang", "org": "" }, { "name": "Ho-Cheol Kim", "org": "" }, { "name": "Yue Qi", "org": "" }, { "name": "Wanli Yang", "org": "" }, { "name": "Feng Pan", "org": "" }, { "name": "Ju Li", "org": "CAS - Institute of Physics" }, { "name": "Kang Xu", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of the American Chemical Society", "year": 2017 }, "Glyu74RC": { "id": "Glyu74RC", "title": "Interface engineering of sulfide electrolytes for all-solid-state lithium batteries", "abstract": "Abstract All-solid-state lithium batteries (ASSLIBs) employing sulfide solid electrolyte hold high promise to replace traditional liquid-electrolyte LIBs due to their high safety and energy density. However, Li dendritic growth in sulfide electrolyte limits the realization of the high energy of ASSLIBs. In this work, we use LiF (or LiI) layer at the interface between Li and sulfide electrolyte and penetrated HFE (or I solution) inside of sulfide electrolyte to suppress the Li dendrite growth. Due to the higher interface energy of LiF/Li than that of LiI/Li, LiF interlayer show much higher capability than LiI in suppressing the Li dendrite. Even if the Li dendrite breaks through LiF (or LiI) interlayer, the Li dendrites will be consumed by coated/penetrated HEF (or I) forming LiF (or LiI) thus preventing Li dendrite growth. A LiNbO 3 @LiCoO 2 /Li 7 P 3 S 11 /Li ASSLIB employing HFE coated/infiltrated Li 7 P 3 S 11 glass-ceramic as electrolyte, and LiF coated Li metal as anode shows a high reversible discharge capacity of 118.9 mAh g −1 at 0.1 mA cm −2 and retains 96.8 mAh g −1 after 100 cycles. The designed solid electrolyte interphase between Li and solid electrolyte that has a high interface energy to Li provides new opportunity to commercialize the Li metal batteries.", "keywords": "", "authors": [ { "name": "Ruochen Xu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Jiangping Tu", "org": "" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" } ], "venue": "Nano Energy", "year": 2018 }, "m1GRVSXP": { "id": "m1GRVSXP", "title": "Strain accommodation and potential hysteresis of LiFePO4 cathodes during lithium ion insertion/extraction", "abstract": "Equilibrium potential hysteresis of electrode materials refers to the phenomenon that discharge equilibrium potential is lower than charge equilibrium potential. It is induced by the strain accommodation energy of phase transformation. Taking LiFePO 4 as an example, the equilibrium potential hysteresis and accommodation energy of two LiFePO 4 with different particle sizes were characterized using galvanostatic intermittent titration technique (GITT), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) methods. The LiFePO 4 sample with 40 nm particle size has lower accommodation energy than that of 100 nm LiFePO 4 , which is due to a narrower miscibility gap and smaller potential hysteresis of 40 nm LiFePO 4 comparing to 100 nm LiFePO 4 . The phase transformation of LiFePO 4 occurs only at potential levels above delithiation (charge) equilibrium potential and below lithiation (discharge) equilibrium potential. No phase transformation occurs when charge/discharge is limited in the potential hysteresis range, i.e. LiFePO 4 behaves like a solid solution in the potential hysteresis range. A reliable EIS can only be obtained when it is performed at the center of potential hysteresis and the potential amplitude does not exceed the range of equilibrium potential hysteresis. The analysis on strain accommodation and potential hysteresis of LiFePO 4 cathodes during Li ion insertion/extraction is also suitable for other phase transformation electrodes. Keywords Equilibrium potential hysteresis Accommodation energy Galvanostatic intermittent titration Technique Cycle voltammetry Electrochemical impedance spectroscopy 1 Introduction LiFePO 4 has been considered to be a promising candidate material for the cathode of high-power, safe, low-cost and long-life Li-ion batteries required for hybrid electric vehicles and renewable energy storage. The most striking characteristic of this material is a flat charge/discharge profile at the potential of ∼3.4 V versus Li/Li + due to the phase transformation. However, pure LiFePO 4 suffered from poor rate capability due to low intrinsic electronic/ionic conductivity and slow phase transformation. Extensive research has been carried out to overcome the poor reaction kinetics of LiFePO 4 . The most effective strategies include (i) to downsize the LiFePO 4 particles to nano-scale [1] and (ii) to coat electronically conductive carbon [2] or an ionically conductive phase [3] onto the LiFePO 4 particle surface. However, only few studies have been focused on the phase transformation [4–7] . Since most capacity of LiFePO 4 comes from a first-order phase transformation, an understanding of the kinetics of the phase transformation is critical to achieving a high-power density for LiFePO 4 , especially for the carbon-coated nano-LiFePO 4 where the electronic and ionic transport have been greatly improved and the slow phase transformation may be a limiting step for the rate performance. Recent research demonstrated the phase transformation in LiFePO 4 is strongly controlled by the strain accommodation energy induced from the volume difference between the lithiated and delithiated phases [4] . The misfit strain between the triphylite phase (Li 1− y FePO 4 ) and the heterosite phase (Li x FePO 4 ) in nano-LiFePO 4 particles was detected using X-ray diffraction (XRD), [4] and dislocations induced by misfit strain were observed in plate-like LiFePO 4 particles using transmission electron microscopy (TEM) [8] . Such a strain-induced energy penalty can decrease the driving energy for phase transformation, [9] resulting in decrease of the phase transformation rate [10] . The accommodation energy decreases the lithiation equilibrium potential [9] but increases the delithiation potential, resulting in an equilibrium potential hysteresis [11] . It was reported that shrinking the LiFePO 4 particle size can narrow the miscibility gap between the lithiated and delithiated phases and decrease the equilibrium potential hysteresis [4] . The fast phase transformation may be one of the reasons for the excellent rate performance of carbon-coated nano-LiFePO 4 . Although the equilibrium potential hysteresis is a critical property of phase transformation electrodes, the characteristics of the equilibrium potential hysteresis of LiFePO 4 cathodes have never been investigated. In this paper, the potential hysteresis of two LiFePO 4 samples with different particle sizes was analyzed using galvanostatic intermittent titration technique (GITT), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). 2 Experimental methods Two LiFePO 4 samples were provided by a commercial supplier. Transmission electron microscopy (TEM) images for both samples were recorded on a Hitachi HF-2000 FEG-TEM, shown in Fig. 1 . The LiFePO 4 samples consisted of aggregates of secondary nano-scale crystal particles with average sizes of 40 nm ( Fig. 1 a) and 100 nm ( Fig. 1 b). The thin carbon coating (2–4 nm) and crystalline single phases of LiFePO 4 can be clearly observed in the high resolution TEM images ( Fig. 1 c), in which the boundaries between LiFePO 4 crystal and carbon coating have been marked. Particle size distributions of two LiFePO 4 samples were obtained by randomly measuring 50 particles from the TEM images. The mean particle size of two LiFePO 4 samples was calculated by the following equation: (1) d m = ∑ i n i d i ∑ i n i where n i is the number of particles with diameter d i . Two LiFePO 4 samples showed very narrow particle size distribution. All electrochemical tests in this paper were performed using three-electrode pouch cells. The LiFePO 4 cathodes containing 82 wt% active material, 10 wt% carbon black and 8 wt% poly(vinylidesfluoride) (PVDF) in 1-methyl-2-pyrrolidinone (NMP) solvent were prepared by the slurry coating method. The formulation was coated onto aluminum foil with a loading of 2.5 mg cm −2 of LiFePO 4 . The three-electrode pouch cells were assembled in an Ar-filled glove box, using lithium metal as the reference and counter electrodes, 1 M LiPF 6 in 1:1:1:3 ethylene carbonate (EC):dimethyl carbonate (DMC):diethyl carbonate (DEC):ethylmethyl carbonate (EMC) as electrolyte and Celgard 3501 as the separator. To measure the relationship between equilibrium potential (fully relaxed open-circuit-potential (OCP)) and state of charge (SOC) or state of discharge (SOD), cells were tested using a galvanostatic intermittent titration technique (GITT). All the GITT tests have been performed using Arbin test station. GITT measurements consisting of a series of current pulses were applied to the three-electrode pouch cells at a low current of less than 0.022 C for 2 h, each followed by a 16 h rest process. The OCP at the end of the 16th hour is considered to be the equilibrium potential. The potential decay during the rest process includes both relaxation and self-discharge. LiFePO 4 electrodes cannot be fully relaxed to equilibrium if the relaxation time is too short. However, a relaxation time that is too long will greatly increase the testing time, resulting in noticeable self-discharge. The potential decay will be mainly controlled by self-discharge if relaxation time is much longer than 16 h, as evidenced from the capacity difference between charge GITT and discharge GITT. The relaxation time of 16 h was selected to allow full relaxation of OCP and to minimize the self-discharge of LiFePO 4 during the test. The potentials of 2.2 and 4.2 V were used as the low and high cutoff voltages in GITT tests. To characterize the equilibrium potential hysteresis of LiFePO 4 in the phase transformation region, cyclic voltammetry (CV) at a scan rate of 0.05 mV s −1 was performed on electrodes at the middle of potential hysteresis between 50% SOC and 50% SOD using different scan potential amplitudes. A low scan rate of 0.05 mV s −1 is used here to decrease the influence of lithium ion diffusion on the current but detect the phase transformation current [12] . Similarly, electrochemical impedance spectroscopy (EIS) was also applied on the LiFePO 4 cathodes at 50% SOC, 50% SOD and at the middle of potential hysteresis between 50% SOC and 50% SOD. Before CV and EIS tests, the electrodes were charged/discharged between 2.2 and 4.2 V at 0.1 C current for two cycles. Both CV and EIS were tested on Solartron 1260/1287. 3 Results and discussion 3.1 Equilibrium potential hysteresis of LiFePO 4 induced by accommodation energy Delithiation/lithiation of LiFePO 4 is usually accompanied by phase transformation between heterosite phase (α phase) and triphylite phase (β phase) [4] . The formation of potential hysteresis during delithiation and lithiation of LiFePO 4 was discussed in our publication [13] . In brief, during Li ion insertion, the lattice parameters of the Li x FePO 4 vary with the lithium stoichiometry and phase transformation, since the newly formed phase has a different molar volume with that of the matrix [4,14] . To accommodate the volume difference, stress and strain will be generated during Li ion insertion into FePO 4 . For a purely elastic matrix, elastic energy will be stored in the matrix and the newly formed phase during phase transformation [15] . For a plastic matrix with a low yield strength, the elastic energy stored in the matrix will be relaxed and spent in creating plastic deformation [16] . Normally, the electrode materials are elastic–plastic solid, the transformation energy is accommodated by both elastic and plastic energy [15] . The plastic deformation in LiFePO 4 during phase transformation has been evidenced from the existence of dislocations and fracture [8,17] . The elastic–plastic accommodation energy is an energy barrier against lithiation and delithiation [9] . It increases the free energy of the material and decreases the lithiation equilibrium potential. The decrease of lithiation equilibrium (open-circuit) potential Δ E lithiation can be determined from [15,18] . (2) Δ E l i t h i a t i o n = E o − E d e = Δ G l i t h i a t i o n e l a s t i c + Δ G l i t h i a t i o n p l a s t i c n F where E o is the theoretical ( accommodation-free ) equilibrium potential, E de is the discharge equilibrium potential after consideration of the accommodation process during Li ion insertion, Δ G l i t h i a t i o n e l a s t i c and Δ G l i t h i a t i o n p l a s t i c are elastic and plastic accommodation energy during lithiation process, n is the number of electrons passed per atom of host material reacted and F is the Faraday's constant. The accommodation energy increases with the depth of discharge process, which is similar to the strain-hardening phenomenon observed in phase transformation of metal hydrides [19] . During Li ion extraction, a reverse phase transformation will occur. The volume changes during the Li ion extraction will also be accommodated by the elastic–plastic process outlined above. Different from the lithiation process, the accommodation energy during Li ion extraction increases the electrode potential. The potential increase during the charge (delithiation) process can be calculated as (3) Δ E d e l i t h i a t i o n = E c e − E o = Δ G d e l i t h i a t i o n e l a s t i c + Δ G d e l i t h i a t i o n p l a s t i c n F where E ce is the charge equilibrium potential after consideration of the accommodation process, Δ G d e l i t h i a t i o n e l a s t i c and Δ G d e l i t h i a t i o n p l a s t i c are elastic and plastic accommodation energy during delithiation process. The accommodation processes during Li ion insertion and extraction dissipate energy to the surroundings, resulting in an open-circuit-potential hysteresis (Δ E lithiation + Δ E delithiation ). Therefore, the equilibrium (open-circuit) potential hysteresis during Li ion insertion and extraction can be calculated from the accommodation energy. From the accommodation energy of Li–Sn alloy, Hirai et al. [9] calculated the lithiation equilibrium potential of Sn using Eq. (2) , which is in excellent agreement with measured data. Eqs. (2) and (3) have also been applied in the metal–hydrogen system for determining the pressure hysteresis of metal hydrides from their accommodation energy [11] . Equilibrium potential hysteresis of phase transformation electrode during lithiation and delithiation can easily be determined using GITT, however, the accommodation energy is very difficult to obtain from materials properties especially for new electrode materials. Based on the relationship between potential hysteresis and accommodation energy in Eqs. (2) and (3) , the accommodation energy can be calculated from equilibrium potential hysteresis. The following reaction occurs during phase transformation from heterosite (Li x FePO 4 ) to triphylite (Li 1− y FePO 4 ). (4) L i x FePO 4 + 1 − y − x L i + + 1 − y − x e − ⇄ d e l i t h i a t i o n l i t h i a t i o n L i 1 − y FePO 4 When the accommodation energy ( Δ G l i t h i a t i o n a c c o m m = Δ G l i t h i a t i o n e l a s t i c + Δ G l i t h i a t i o n p l a s t i c ) change during lithiation is defined as joules per molar of FePO 4 , the accommodation energy for the lithiation process can be expressed as (5) Δ G l i t h i a t i o n a c c o m m = ( 1 − x − y ) F Δ E l i t h i a t i o n Since the values of x , 1 − y and Δ E lithiation can be obtained from the equilibrium potential-composition isotherm curves, [15] the accommodation energy can be calculated using Eq. (4) . Similarly, the accommodation energy during delithiation can also be obtained using (6) Δ G d e l i t h i a t i o n a c c o m m = ( 1 − x − y ) F Δ E d e l i t h i a t i o n The equilibrium potential of LiFePO 4 with secondary particle sizes of 40 and 100 nm were tested at different levels of lithiation and delithiation ( Fig. 2 ). The equilibrium potentials of both LiFePO 4 electrodes gradually decreased with Li ion insertion but increased with Li ion extraction. The variation in equilibrium potential of 40 nm LiFePO 4 during Li ion insertion and extraction is less than that of 100 nm LiFePO 4 . Both LiFePO 4 particles have a similar delithiation equilibrium potential within the miscibility gap, however, the lithiation equilibrium potential of 40 nm LiFePO 4 is 5–6 mV higher than that of 100 nm LiFePO 4 , resulting in a smaller potential hysteresis (8–10 mV) for 40 nm LiFePO 4 , compared to 13–16 mV for 100 nm LiFePO 4 . In addition, nano-scale (40 nm) LiFePO 4 has a reduced miscibility gap compared to coarser-grained (100 nm) materials. The size-dependent potential hysteresis and miscibility gap shown in Fig. 2 are well in agreement with the observations from other researchers [4,5,20] . The accommodation energies of LiFePO 4 with different particle sizes during the first cycle of lithiation and delithiation in the phase transformation region were calculated from equilibrium potential hysteresis using Eqs. (5) and (6) and shown in Fig. 3 . The theoretical equilibrium potential E o is defined as the average value of potentials, at which the charge and discharge phase transformation initiated. Compared to 100 nm LiFePO 4 , 40 nm LiFePO 4 has a lower accommodation energy due to a narrow potential hysteresis and a reduced miscibility gap in nano-size LiFePO 4 [5] . Both the short diffusion length and a low accommodation energy in nano-LiFePO 4 accelerate the phase transformation rate, resulting in high rate performance [4] . The accommodation energy of both LiFePO 4 samples increased with SOD and SOC. At Li 0.5 FePO 4 , the discharge (lithiation) accommodation energy is larger than the charge (delithiation) accommodation energy. The reduced accommodation energy in charge compared to discharge may be one of the reasons for higher charge rate capability of LiFePO 4 than that for discharge [21] . It has been reported that dislocations and other defects were generated during the first cycle of Li ion insertion/extraction in LiFePO 4 [8,17] . These defects change the accommodation energy in the following cycles. Therefore, the accommodation energy in the second charge/discharge cycle may be different from the values in the first cycle. Fig. 4 a compares the equilibrium potentials of 100 nm LiFePO 4 in the first and second charge/discharge cycles. The corresponding accommodation energies in the first and second charge and discharge cycles are illustrated in Fig. 4 b. As shown in Fig. 4 a, the discharge equilibrium potential in the second charge/discharge cycle is almost the same as that in the first cycle, but the charge equilibrium potential in the second charge/discharge cycle is lower than that in the first cycle at later SOC. The lower charge equilibrium potential induced lower charge accommodation energy in the second charge cycle. These behaviors are most likely due to (i) the introduction of dislocations and/or fractures in micro-LiFePO 4 in the first charge/discharge cycle, which lowered the energy required for phase growth for the second charge cycle, and (ii) the volume expansion/shrinkage of LiFePO 4 during the first charge/discharge cycle, which may locally rearrange the position of LiFePO 4 particles to accommodate the stress. The reduced accommodation energy during the initial charge/discharge cycles is consistent with the activation process of LiFePO 4 electrodes. However, why these defects only affect the charge accommodation energy but not the discharge accommodation energy is not clear. As shown in Fig. 4 b, the discharge accommodation energy of 100 nm LiFePO 4 increased up to 750 J mol −1 when Li x FePO 4 (α phase) gradually transformed into Li 1− y FePO 4 (β phase). The maximum accommodation energy (750 J mol −1 ) of LiFePO 4 during phase transformation from Li x FePO 4 to Li 1− y FePO 4 is less than the accommodation energy (972 J mol −1 ) of Nb during phase transformation from Nb to NbH [15] and is much smaller than the accommodation energy (9630 J mol −1 ) of Sn during phase transformation from Sn to Li 0.4 Sn [9] . Therefore, the exceptional rate performance of LiFePO 4 may be partially attributed to the lower accommodation energy during phase transformation compared to Sn anode for Li-ion battery and Nb–hydride anodes for Ni/MH batteries. 3.2 Characterization of potential hysteresis with GITT To characterize the property of equilibrium potential hysteresis of LiFePO 4 , the delithiation equilibrium potential of 100 nm LiFePO 4 was measured after being equilibriately discharged to different levels (SOD: 40%, 60%, 80% and 100%) using GITT and shown in Fig. 5 . At a given Li ion concentration, the charge equilibrium potential increased with the depth of the previous SOD. For example, the electrode with composition Li 0.3 FePO 4, which was previously completely discharged, has the highest charge equilibrium potential, while the Li 0.3 FePO 4 electrode that was previously discharged to Li 0.4 FePO 4 has the lowest charge equilibrium potential. Although the equilibrium potential of the following charge process increased with the depth of previous SOD, the initial potential for the phase transformation from β to α phase during charge process occurs at the same value (see A–B line in Fig. 5 ) no matter how much Li ion was inserted into FePO 4 in the previous discharge. If the charge equilibrium potential lines previously discharged to SOD 40%, 60% and 80% are moved along the A → B direction to the charge potential line previously discharged to SOD 100%, four charge lines will be completely overlapped. Therefore, the charge equilibrium potentials following different SOD levels are solely attributed to the fraction of newly formed α phase rather than the fraction of α phase left during previous SOD. To illustrate the kinetics of charge and discharge of LiFePO 4 , the potential responses during each current pulse in the GITT measurement were recorded and shown in Fig. 6 . Due to the resolution limitation of Arbin equipment, the potential jump due to solid-electrolyte-interphase resistance and charge transfer reaction cannot be monitored. The polarization curves recorded in Fig. 6 only reflect potential change due to Li-ion diffusion and the phase transformation. As demonstrated in Fig. 6 , both charge and discharge overpotentials increased with the fraction of new phase. To investigate the kinetics of discharge at different SOD, the GITT potential-time profiles at the 2nd, 5th and 10th discharge pulse were compared by shifting their initial open-circuit potentials together, as shown in Fig. 7 . The changes in equilibrium OCP (Δ E in Fig. 7 ) before and after current pulses are almost the same in three current pulses. However, overpotential (the potential difference between fully relaxed OCP and the potential at the end of the current pulse) in Fig. 7 increased with SOD. By carefully comparing the potential response in each current pulse ( Fig. 7 ), we found that the initial potential exponentially drops, followed by an almost linear decrease with time. The initial potential drop is due to the Li-ion diffusion, and the later slow decrease in potential is attributed to the phase transformation. The diffusion polarization quickly increases with SOD, but the phase transformation polarization only slightly changes with SOD. Fig. 7 demonstrates that the increase in overpotential with SOD is mainly attributed to the increase in Li-ion diffusion length due to the growth of the β phase. The increase in diffusion overpotential with phase transformation was also observed in the lithiation/delithiation of graphite [22] . The charge GITT following different SOD was used to characterize potential hysteresis. As shown in Fig. 6 the polarization curves are SOD-independent, i.e. the potential responses in charge GITT following different SOD were similar at the same potential level except for 40% SOD in which the charge time of LiFePO 4 was shortened from 0.66 h (for all other SOD) to 0.33 h to get more equilibrium potential data. To clearly show the potential response, the discharge and charge GITT curves at 60% SOD were enlarged and shown in Fig. 8 . The potential response in each charge GITT curve shows only exponential increase (diffusion polarization) without linear polarization (phase transformation polarization) until the 7th charge GITT curve, where the polarization potential exceeds the charge equilibrium potential and phase transformation occurs. Therefore, no phase transformation occurs inside potential hysteresis region. Although in the potential hysteresis region, LiFePO 4 still consists of two phases, it behaves like a solid solution. Here, we need to point out that during charge/discharge, in the potential hysteresis region, Li ions can penetrate across the interface, and the interface between two phases in LiFePO 4 does not move, which is different from the behavior of phase transformation and similar to solid solution. The solid solution behavior in the potential hysteresis region is also supported by the fact that the charge polarization curves after different SOD are similar to the charge polarization curves after fully discharged (100% SOD), shown in Fig. 6 , and the fully discharged (100% SOD) LiFePO 4 is a solid solution before the charge potential reaches the charge equilibrium potential. In addition, the first charge overpotential is much smaller than the previous discharge overpotentials. For example, the overpotential at the 10th discharge GITT (10d in Fig. 8 ) is around 6.0 mV at the discharge current of 0.022 C. However, the overpotential in the first charge GITT (1c in Fig. 8 ) is only 3 mV at the same current, while the overpotential in the following discharge GITT (11d in Fig. 8 ) is 7 mV. The difference between the 11th discharge and the 1st charge is that phase transformation occurs in the 11th discharge, while no phase transformation takes place in the 1st charge. The phase transformation overpotential at the 11th discharge GITT is around 4.0 mV, which is 57% of the total (phase transformation and diffusion) overpotential. 3.3 Characterization of phase transformation potential hysteresis with CV and EIS Cycle voltammetry (CV) is a common and useful tool to distinguish the phase transformation from a solid solution because the current will be enhanced in the phase transformation region. Therefore, the CV is used to characterize the phase transformation behavior of LiFePO 4 across the potential hysteresis where the phase transformation of LiFePO 4 occurs only when the applied potential is lower than the lithiation equilibrium potential or higher than delithiation equilibrium potential. LiFePO 4 in the potential hysteresis range can be considered as a solid solution material. Fig. 9 shows the CV scans of 100 nm LiFePO 4 at the center of potential hysteresis (marked in Fig. 4 a) using different scan potential amplitudes but a fixed scan rate of 0.05 mV s −1 . Before each CV measurement, the 100 nm LiFePO 4 electrode was fully charged to 4.2 V and then discharged to SOD 50% followed by charging the electrode to 3.427 V and holding the electrode at this potential for 2 h. 3.427 V is the potential halfway between lithiation potential (3.422 V) and delithiation potential (3.432 V). By changing the amplitude of CV (±2, ±4, ±6, ±8, ±10, ±12, ±15, ±20, ±25, ±30, ±35 mV), the reversibility of the reactions inside and outside of the potential hysteresis range was characterized. When the amplitudes of CV are similar or less than the half value of potential hysteresis (6–8 mV), the potential almost linearly changed with current. However, for CV with a large amplitude (>12 mV), a rapid increase in current was observed when the lithiation potential was below 3.42 V and delithiation potential was above 3.435 V, which is due to the phase transformation. The CV scans starting at the center of potential hysteresis with different potential amplitudes demonstrated solid solution behavior inside the potential hysteresis and phase transformation characteristic outside of the potential hysteresis range. EIS has been widely used in Li-ion batteries to evaluate the charge/discharge kinetics. A reliable EIS can be obtained only if the system satisfies the criteria of linearity and time invariance (LTI) [23] . If EIS is measured at the open-circuit after charging or discharging to a given state, the phase transformation occurs only in the forward potential scan, not in the backward potential scan, resulting in a SOD or SOC shift during EIS measurement. Therefore, the LiFePO 4 is not a linear and time invariant system if EIS is measured at the certain charge or discharge equilibrium potentials. The EIS normally measured at different SOD or SOC are not reliable. A reliable and useful EIS can only be obtained by shifting the testing potential to the center of the potential hysteresis. Fig. 10 shows the EIS plots measured at 50% SOD, 50% SOC and in the center of the potential hysteresis (marked in Fig. 4 a) with different potential amplitudes. To alleviate OCP shift during the EIS measurement, the LiFePO 4 sample after each EIS measurement at 50% SOD (or 50% SOC) was fully re-charged (or fully re-discharged for SOC) and then discharged to 50% SOD (or charged to 50% SOC) for the following EIS test. The impedances of LiFePO 4 in Fig. 10 consist of two semicircles and a sloped line. For a solid solution electrode, the high frequency semicircle in EIS is attributed to the SEI film, middle frequency semicircle to charge transfer, and low frequency line to diffusion. The impedance at 50% SOC is much smaller than that at 50% SOD, resulting in higher rate capability in charge than in discharge. EIS in both 50% SOD and 50% SOC are less sensitive to signal amplitude. Since the EIS performed at charge or discharge equilibrium potential is not reliable, EIS should be performed at the center of potential hysteresis. When the EIS test is conducted at the center of potential hysteresis using amplitudes less than half of the potential hysteresis, the LiFePO 4 can be treated as a solid solution since no phase transformation occurs in the potential hysteresis region. When the amplitude of EIS test is much larger than half of the potential hysteresis, the phase transformation can happen. In this case, if the kinetics of forward phase transformation is similar to the backward phase transformation, a reliable EIS can still be obtained. The EIS measured at the center of potential hysteresis using different amplitudes was shown in Fig. 10 . The impedances with amplitudes larger than half of the potential hysteresis have a larger second semicircle than those with amplitudes less than the potential hysteresis, which indicate that phase transformations cause additional impedance. The phase transformation impedance appears at a higher frequency than Li-ion diffusion impedance and is mixed with the impedance of the charge transfer reaction. The phase transformation impedance of LiFePO 4 was obtained by subtracting impedance without phase transformation from phase transformation impedance. The phase transformation impedance of LiFePO 4 is around 20 Ω. The phase transformation impedance is 50% of total (phase transformation + ion diffusion) impedance, which is similar to the overpotential ratio (57%) obtained using GITT in Fig. 8 . 4 Conclusions Equilibrium potential hysteresis of LiFePO 4 is a thermodynamic property, which is induced by strain accommodation energy. The OCP hysteresis of LiFePO 4 in the phase transformation region was determined using the GITT method, and the corresponding accommodation energies were calculated according to the potential hysteresis. 40 nm-LiFePO 4 has low accommodation energy during lithiation and delithiation, which is attributed to the narrow miscibility gap and small potential hysteresis. Phase transformation only occurs at a potential level above charge OCP or below discharge OCP. The LiFePO 4 inside potential hysteresis region behaves like a solid solution. Normal EIS obtained at different SOD or SOC cannot satisfy the criteria of linearity and time invariance (LTI). A reliable EIS can be obtained at the center of potential hysteresis, and phase transformation impedance can be obtained by changing the amplitude of the EIS signal from less than to greater than half of the potential hysteresis. Acknowledgement The authors gratefully acknowledge the support of the National Science Foundation under Contract No. CBET0933228 (Dr. Maria Burka, Program Director). References [1] N. Meethong H.S. Huang W.C. Carter Y.M. Chiang Electrochem. Solid-State Lett. 10 2007 A134 [2] M.M. Doeff F. Hu F. Mclarnon R. Kostecki Electrochem. Solid-State Lett. 6 2003 A207 [3] O. Kang G. Ceder Nature 458 2009 190 [4] N. Meethong H.S. Huang S.A. Speakman W.C. Cater Y.M. Chiang Adv. Funct. Mater. 17 7 2007 1115 [5] N. Meethong Y.H. Kao M. Tang H.Y. Huang W.C. Carter Y.M. Chiang Chem. Mater. 20 2008 6189 6198 [6] C. Delmas M. Maccario L. Croguennec F.L. Cras F. Well Nat. Mat. 7 2008 665 [7] G. Kobayashi S.I. Nishimura M.S. Park R. Kanno M. Yashima T. Ida A. Yamada Adv. Funct. Mater. 19 7 2009 395 [8] H. Gabrisch J. Wilcox M.M. Doeff Electrochem. Solid-State Lett. 11 2008 A25 [9] K. Hirai T. Ichistubo T. Uda A. Miyazaki S. Yagi E. Matsubara Acta Mater. 56 2008 1539 [10] E. Gamsjager T. Antretter C. 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Circuits Signals and System 1986 The MIT Press and McGraw-Hill Book Company New York", "keywords": [ "particle size", "solid solution", "electrochemical impedance spectroscopy" ], "authors": [ { "name": "Yujie Zhu", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Journal of Power Sources", "year": 2011 }, "jfc0E60i": { "id": "jfc0E60i", "title": "Manipulating electrolyte and solid electrolyte interphase to enable safe and efficient Li-S batteries", "abstract": "Abstract Li-S batteries have been considered promising candidates for the next-generation energy storage devices because of their extremely high energy densities and low cost. However, Li dendrite formation/dissolution and shuttle of high-order polysulfides prevent their practical applications. Herein, we demonstrate a highly concentrated electrolyte, 12 M lithium bis(fluorosulfonyl)imide (LiFSI) salt in DME solvent (12 M LiFSI/DME), that can effectively suppress both the Li dendritic growth on the anode and the polysulfide shuttle reactions on the cathode side. The highly concentrated electrolyte along with the robust solid electrolyte interphase (SEI) formed therein play the key role in achieving high coulombic efficiencies for both Li stripping/plating (u003e 99.2%) and S cathode (u003e 99.7%). Based on the in-depth understanding of the interactions between electrodes and highly concentrated electrolyte, we designed a novel dilute electrolyte (1 M LiFSI/HFE + DME), which achieves similar electrochemical performances in Li-S batteries as the concentrated electrolytes. These Li-S batteries with the highest CE for Li anode and sulfur cathode maintains a high reversible capacity of 786 mA h/g at 0.1 A/g after 300 cycles, or 644 mA h/g at 300th cycle even at 1 A/g without any detectable shuttle reactions.", "keywords": "", "authors": [ { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park, MD 20742, USA" }, { "name": "Jing Zheng", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park, MD 20742, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park, MD 20742, USA" }, { "name": "Guangbin Ji", "org": "College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China" }, { "name": "Haiyang Wang", "org": "" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park, MD 20742, USA" }, { "name": "Kerry C. DeMella", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA" }, { "name": "Srinivasa R. Raghavan", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park, MD 20742, USA" }, { "name": "Jing Wang", "org": "School of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, PR China" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland, College Park, MD 20742, USA" } ], "venue": "Nano Energy", "year": 2018 }, "o8k1N7Pm": { "id": "o8k1N7Pm", "title": "3D Si/C Fiber Paper Electrodes Fabricated Using a Combined Electrospray/Electrospinning Technique for Li‐Ion Batteries", "abstract": "Although the theoretical capacity of silicon is ten times higher than that of graphite, the overall electrode capacity of Si anodes is still low due to the low Si loading and heavy metal current collector. Here, a novel flexible 3D Si/C fiber paper electrode synthesized by simultaneously electrospraying nano-Si-PAN (polyacrylonitrile) clusters and electrospinning PAN fibers followed by carbonization is reported. The combined technology allows uniform incorporation of Si nanoparticles into a carbon textile matrix to form a nano-Si/carbon composite fiber paper. The flexible 3D Si/C fiber paper electrode demonstrate a very high overall capacity of approximate to 1600 mAh g(-1) with capacity loss less than 0.079% per cycle for 600 cycles and excellent rate capability. The exceptional performance is attributed to the unique architecture of the flexible 3D Si/C fiber paper, i.e., the resilient and conductive carbon fiber network matrix, carbon-coated Si nanoparticle clusters, strong adhesion between carbon fibers and Si nanoparticle clusters, and uniform distribution of Si/C clusters in the carbon fiber frame. The scalable and facile synthesis method, good mechanical properties, and excellent electrochemical performance at a high Si loading make the flexible 3D Si/C fiber paper batteries extremely attractive for plug-in electric vehicles, flexible electronics, space exploration, and military applications.", "keywords": [ "electrospinning" ], "authors": [ { "name": "yunhua xu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "fudong han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2015 }, "gQNo45gh": { "id": "gQNo45gh", "title": "3D tin anodes prepared by electrodeposition on a virus scaffold", "abstract": "", "keywords": [ "tobacco mosaic virus" ], "authors": [ { "name": "xilin chen", "org": "" }, { "name": "juchen guo", "org": "" }, { "name": "konstantinos gerasopoulos", "org": "" }, { "name": "alex langrock", "org": "" }, { "name": "adam brown", "org": "" }, { "name": "reza ghodssi", "org": "" }, { "name": "james n culver", "org": "" }, { "name": "chunsheng wang", "org": "" } ], "venue": "Journal of Power Sources", "year": 2012 }, "NtxPYSxj": { "id": "NtxPYSxj", "title": "Synergistic gelation of silica nanoparticles and a sorbitol-based molecular gelator to yield highly-conductive free-standing gel electrolytes.", "abstract": "Lithium-ion batteries have emerged as the preferred type of rechargeable batteries, but there is a need to improve the performance of the electrolytes therein. Specifically, the challenge is to obtain electrolytes with the mechanical rigidity of solids but with liquid-like conductivities. In this study, we report a class of nanostructured gels that are able to offer this unique combination of properties. The gels are prepared by utilizing the synergistic interactions between a molecular gelator, 1,3:2,4-di-O-methyl-benzylidene-d-sorbitol (MDBS), and a nanoscale particulate material, fumed silica (FS). When MDBS and FS are combined in a liquid consisting of propylene carbonate with dissolved lithium perchlorate salt, the liquid electrolyte is converted into a free-standing gel due to the formation of a strong MDBS-FS network. The gels exhibit elastic shear moduli around 1000 kPa and yield stresses around 11 kPa-both values considerably exceed those obtainable by MDBS or FS alone in the same liquid. At the same time, the gel also exhibits electrochemical properties comparable to the parent liquid, including a high ionic conductivity (~5 × 10(-3) S/cm at room temperature) and a wide electrochemical stability window (up to 4.5 V).", "keywords": [ "dibenzylidene sorbitol", "fumed silica", "molecular gels", "lithium-ion batteries", "self-assembly", "nanocomposite gels" ], "authors": [ { "name": "Veidhes R Basrur", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742-2111, USA." }, { "name": "Juchen Guo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Srinivasa R Raghavan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS applied materials & interfaces", "year": 2013 }, "9ARnrpDn": { "id": "9ARnrpDn", "title": "Realizing Complete Solid-Solution Reaction in a High Sodium-Content P2-Type Cathode for High-Performance Sodium-Ion Batteries.", "abstract": "P2-type layered oxides suffer from an ordered Na+/vacancy arrangement and P2 -> O2/OP4 phase transitions, leading them to exhibit multiple voltage plateaus upon Na(+)extraction/insertion. The deficient sodium in the P2-type cathode easily induces the bad structural stability at deep desodiation states and limited reversible capacity during Na(+)de/insertion. These drawbacks cause poor rate capability and fast capacity decay in most P2-type layered oxides. To address these challenges, a novel high sodium content (0.85) and plateau-free P2-type cathode-Na0.85Li0.12Ni0.22Mn0.66O2(P2-NLNMO) was developed. The complete solid-solution reaction over a wide voltage range ensures both fast Na(+)mobility (10(-11)to 10(-10) cm(2) s(-1)) and small volume variation (1.7 %). The high sodium content P2-NLNMO exhibits a higher reversible capacity of 123.4 mA h g(-1), superior rate capability of 79.3 mA h g(-1)at 20 C, and 85.4 % capacity retention after 500 cycles at 5 C. The sufficient Na and complete solid-solution reaction are critical to realizing high-performance P2-type cathodes for sodium-ion batteries.", "keywords": [ "batteries", "electrochemistry", "materials chemistry", "sodium", "structure elucidation" ], "authors": [ { "name": "Ting Jin", "org": "Nankai Univ, Key Lab Adv Energy Mat Chem, Renewable Energy Convers & Storage Ctr ReCast, Minist Educ,Coll Chem, Tianjin 300071, Peoples R China" }, { "name": "Peng-Fei Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Qin-Chao Wang", "org": "Brookhaven Natl Lab, Div Chem, Upton, NY 11973 USA" }, { "name": "Kunjie Zhu", "org": "Nankai Univ, Key Lab Adv Energy Mat Chem, Renewable Energy Convers & Storage Ctr ReCast, Minist Educ,Coll Chem, Tianjin 300071, Peoples R China" }, { "name": "Tao Deng", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jiaxun Zhang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Wei Zhang", "org": "Nankai Univ, Key Lab Adv Energy Mat Chem, Renewable Energy Convers & Storage Ctr ReCast, Minist Educ,Coll Chem, Tianjin 300071, Peoples R China" }, { "name": "Xiao-Qing Yang", "org": "Brookhaven Natl Lab, Div Chem, Upton, NY 11973 USA" }, { "name": "Lifang Jiao", "org": "Nankai Univ, Key Lab Adv Energy Mat Chem, Renewable Energy Convers & Storage Ctr ReCast, Minist Educ,Coll Chem, Tianjin 300071, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2020 }, "8HQEHxoV": { "id": "8HQEHxoV", "title": "Author Correction: Aqueous Li-ion battery enabled by halogen conversion–intercalation chemistry in graphite", "abstract": "", "keywords": "", "authors": [ { "name": "Chongyin Yang", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Ji Chen", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiao Ji", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Travis P. Pollard", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, USA" }, { "name": "Xujie Lü", "org": "Center for High Pressure Science and Technology Advanced Research, Shanghai, China" }, { "name": "Cheng-Jun Sun", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory,Argonne,USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Qi Liu", "org": "Department of Physics, City University of Hong Kong, Hong Kong, China" }, { "name": "Cunming Liu", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory,Argonne,USA" }, { "name": "Tingting Qing", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Yingqi Wang", "org": "Center for High Pressure Science and Technology Advanced Research, Shanghai, China" }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, USA" }, { "name": "Yang Ren", "org": "X-ray Science Division, Advanced Photon Source, Argonne National Laboratory,Argonne,USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland,College Park,USA" } ], "venue": "Nature", "year": 2019 }, "ZQpq2rwv": { "id": "ZQpq2rwv", "title": "Aqueous Mg-Ion Battery Based on Polyimide Anode and Prussian Blue Cathode", "abstract": "The magnesium-metal battery, which consists of a cathode, a Mg-metal anode, and a nonaqueous electrolyte, is a safer and less expensive alternative to the popular Li-ion battery. However, the performance of Mg batteries is greatly limited by the low electrochemical oxidative stability of nonaqueous electrolytes, the slow Mg2+ diffusion into the cathode, and the irreversibility of Mg striping and plating on the Mg metal anode. Here, we report the first Mg-ion battery using a Mg2+ aqueous electrolyte, nickel hexacyanoferrate cathode, and polyimide anode. The operation depends on Mg2+ intercalation–deintercalation at the cathode and reversible enolization at the anode, accompanied by Mg2+ transport between cathode and anode. The cell exhibits a maximum cell voltage of 1.5 V and a supercapacitor-like high power, and it can be cycled 5000 times. This system points the way to improved Mg-based rechargeable batteries.", "keywords": "", "authors": [ { "name": "Long Chen", "org": "Fudan University" }, { "name": "Long Chen", "org": "Fudan University" }, { "name": "Junwei Lucas Bao", "org": "University of Minnesota Twin Cities" }, { "name": "Xiaoli Dong", "org": "Fudan University" }, { "name": "Donald G. Truhlar", "org": "" }, { "name": "Yang Wang", "org": "" }, { "name": "Chunsheng Wang", "org": "University of Maryland" }, { "name": "Yongyao Xia", "org": "Fudan University" } ], "venue": "ACS energy letters", "year": 2017 }, "z5WgVcbK": { "id": "z5WgVcbK", "title": "High Performance All-Solid-State Na-S Battery Enabled by Casting-Annealing Technology.", "abstract": "Room temperature all solid-state Na-S batteries (ASNSBs) using sulfide solid electrolytes are a promising next-generation battery technology due to the high energy, enhanced safety, and earth abundant resources of both sodium and sulfur. Currently, the sulfide electrolyte ASNSBs are fabricated by simple cold-pressing process leaving with high residential stress. Even worse, the large volume change of S/Na2S during charge/discharge cycles induces additional stress, seriously weakening the less-contacted interfaces among the solid electrolyte, active materials and the electron conductive agent that are formed in the cold-pressing process. The high and continuous increase of the interface resistance hindered its practical application. Herein, we significantly reduce the interface resistance and eliminate the residential stress in Na2S cathodes by fabricating Na2S-Na3PS4-CMK-3 nanocomposites using melting-casting followed by stress-release annealing-precipitation process. The casting-annealing process guarantees the close contact between the Na3PS4 solid electrolyte and the CMK-3 mesoporous carbon in mixed ionic/electronic conductive matrix, while the in situ precipitated Na2S active species from the solid electrolyte during annealing process guarantees the interfacial contact among these three sub-components without residential stress, which greatly reduces the interfacial resistance, and enhances the electrochemical performance. The in situ synthesized Na2S-Na3PS4-CMK-3 composite cathode delivers a stable and highly reversible capacity of 810 mAh/g at 50 mA/g for 50 cycles at 60 °C. The present casting-annealing strategy should provide opportunities for the advancement of mechanically robust and high performance next generation ASNSBs.", "keywords": [ "Na-S batteries", "solid-state electrolyte", "Na3PS4", "casting-annealing", "Na2S" ], "authors": [ { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Jie Yue", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fudong Han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Deng", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiuquan Zhou", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2018 }, "Ic5NfSGz": { "id": "Ic5NfSGz", "title": "In situ synthesis of SnO2 nanoparticles encapsulated in micro/mesoporous carbon foam as a high-performance anode material for lithium ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "xiulin fan", "org": "university of maryland college park" }, { "name": "jie shao", "org": "zhejiang university" }, { "name": "xuezhang xiao", "org": "zhejiang university" }, { "name": "xinhua wang", "org": "zhejiang university" }, { "name": "shouquan li", "org": "zhejiang university" }, { "name": "hongwei ge", "org": "zhejiang university" }, { "name": "lixin chen", "org": "zhejiang university" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "", "year": 2014 }, "V8G5moqI": { "id": "V8G5moqI", "title": "Intercalation of Bi nanoparticles into graphite results in an ultra-fast and ultra-stable anode material for sodium-ion batteries", "abstract": "Sodium ion batteries (SIBs) have been revived as important alternative energy storage devices for large-scale energy storage, which requires SIBs to have a long cycling life and high power density. However, the scarcity of suitable anode materials hinders their application. Herein, we report a bismuth intercalated graphite (Bi@Graphite) anode material, which is substantially different from the previously reported metal@Graphene. In Bi@Graphite, the Bi nanoparticles between graphite interlayers enhance the capacity, while the graphite sheath provides a robust fast electronic connection for long cycling stability. The Bi@Graphite possesses a safe average storage potential of approximately 0.5 V vs. Na/Na+, delivers a capacity of ∼160 mA h g−1 at 1C (160 mA g−1), exhibits outstanding cycling stability (ca. 90% capacity retention for 10 000 cycles at 20C), and can maintain 70% capacity at 300C (∼110 mA h g−1 at 48 A g−1), which is equivalent to full charge/discharge in 12 s. Bi@Graphite demonstrates the highest rate-capability ever reported among all anodes for SIBs. Detailed characterization results indicate that the unique Bi nanoparticle-in-graphite structure and the fast kinetics of ether co-intercalation into graphite are responsible for these significant improvements, which could translate into SIBs with excellent power densities.", "keywords": "", "authors": [ { "name": "Ji Chen", "org": "" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiuquan Zhou", "org": "" }, { "name": "Luning Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland,College Park,USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Energy and Environmental Science", "year": 2018 }, "AvisXW3t": { "id": "AvisXW3t", "title": "Tunable High‐Molecular‐Weight Anion‐Exchange Membranes for Alkaline Fuel Cells", "abstract": "", "keywords": [ "emulsion polymerization", "membranes" ], "authors": [ { "name": "yanting luo", "org": "university of maryland college park" }, { "name": "juchen guo", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "deryn chu", "org": "united states army research laboratory" } ], "venue": "Macromolecular Chemistry and Physics", "year": 2011 }, "BYXDsv8p": { "id": "BYXDsv8p", "title": "Hybrid Aqueous/Non-aqueous Electrolyte for Safe and High-Energy Li-Ion Batteries", "abstract": "Summary Recent breakthroughs in aqueous electrolytes made highly safe 3.0 V class aqueous Li-ion batteries possible. However, the formed solid-electrolyte interphase therein still cannot effectively support the desired energy-dense anode and cathode materials. In this work, we report a new class of electrolytes, by hybridizing aqueous with non-aqueous solvents, that inherits the non-flammability and non-toxicity characteristics from aqueous and better electrochemical stability from non-aqueous systems. The secondary interphasial ingredient (alkylcarbonate) introduced by non-aqueous component helps to expand the electrochemical window of the hybridized electrolyte to 4.1 V, which supports the operation of a 3.2 V aqueous Li-ion battery based on Li 4 Ti 5 O 12 and LiNi 0.5 Mn 1.5 O 4 to deliver a high energy density of 165 Wh/kg for u003e1,000 cycles. The understanding of how a better interphase could be tailored by regulating the inner-Helmholtz interfacial structures of the hybridized electrolyte provides important guidelines for designing future electrolytes and interphases for new battery chemistries.", "keywords": "", "authors": [ { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, College Park, MD 20742, USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, College Park, MD 20742, USA" }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Michael S. Ding", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Mallory Gobet", "org": "Department of Physics & Astronomy, Hunter College of the City University of New York, New York, NY 10065, USA" }, { "name": "Jenel Vatamanu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, College Park, MD 20742, USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, College Park, MD 20742, USA" }, { "name": "Nico Edison", "org": "" }, { "name": "Yujia Liang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, College Park, MD 20742, USA" }, { "name": "Wei Sun", "org": "" }, { "name": "Steve Greenbaum", "org": "Department of Physics & Astronomy, Hunter College of the City University of New York, New York, NY 10065, USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, College Park, MD 20742, USA" } ], "venue": "Joule", "year": 2018 }, "Z4juseaE": { "id": "Z4juseaE", "title": "Dual-template synthesis of ordered mesoporous carbon/Fe2O3 nanowires: high porosity and structural stability for supercapacitors", "abstract": "", "keywords": [], "authors": [ { "name": "junkai hu", "org": "university of maryland college park" }, { "name": "malachi noked", "org": "university of maryland college park" }, { "name": "eleanor gillette", "org": "university of maryland college park" }, { "name": "fudong han", "org": "university of maryland college park" }, { "name": "zhe gui", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "sang bok lee", "org": "university of maryland college park" } ], "venue": "", "year": 2015 }, "BWERQ0Dz": { "id": "BWERQ0Dz", "title": "Novel Electro-Analytical Tools for Phase-Transformation Electrode Materials", "abstract": "", "keywords": [ "nanotechnology", "titration", "experimental design", "particle size", "volumetric analysis", "electrochemistry", "electrodes" ], "authors": [ { "name": "chunsheng wang", "org": "" }, { "name": "yujie zhu", "org": "" } ], "venue": "", "year": 2009 }, "0I37rPNl": { "id": "0I37rPNl", "title": "Fuel cell durability enhancement by crosslinking alkaline anion exchange membrane electrolyte", "abstract": "", "keywords": [ "crosslinking", "energy conversion" ], "authors": [ { "name": "yanting luo", "org": "" }, { "name": "juchen guo", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "deryn chu", "org": "" } ], "venue": "Electrochemistry Communications", "year": 2012 }, "U4CHirZ1": { "id": "U4CHirZ1", "title": "Anisotropic swelling and fracture of silicon nanowires during lithiation", "abstract": "We report direct observation of an unexpected anisotropic swelling of Si nanowires during lithiation against either a solid electrolyte with a lithium counter-electrode or a liquid electrolyte with a LiCoO2 counter-electrode. Such anisotropic expansion is attributed to the interfacial processes of accommodating large volumetric strains at the lithiation reaction front that depend sensitively on the crystallographic orientation. This anisotropic swelling results in lithiated Si nanowires with a remarkable dumbbell-shaped cross section, which develops due to plastic flow and an ensuing necking instability that is induced by the tensile hoop stress buildup in the lithiated shell. The plasticity-driven morphological instabilities often lead to fracture in lithiated nanowires, now captured in video. These results provide important insight into the battery degradation mechanisms. © 2011 American Chemical Society.", "keywords": [ "anisotropic swelling", "fracture", "in situ tem", "lithium ion battery", "silicon nanowire", "volume expansion" ], "authors": [ { "name": "Xiao Hua Liu", "org": "Sandia National Laboratories, New Mexico(Sandia National Laboratories,Sandia Natl Lab),Albuquerque,United States" }, { "name": "He Zheng", "org": "University of Pittsburgh(University of Pittsburgh),Pittsburgh,United States" }, { "name": "Li Zhong", "org": "University of Pittsburgh(University of Pittsburgh),Pittsburgh,United States" }, { "name": "Shan Huang", "org": "The George W. Woodruff School of Mechanical Engineering(Georgia Institute of Technology),Atlanta,United States" }, { "name": "Khim Karki", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Li Qiang Zhang", "org": "University of Pittsburgh(University of Pittsburgh),Pittsburgh,United States" }, { "name": "Yang Liu", "org": "Sandia National Laboratories, New Mexico(Sandia National Laboratories,Sandia Natl Lab),Albuquerque,United States" }, { "name": "Akihiro Kushima", "org": "University of Pennsylvania(University of Pennsylvania),Philadelphia,United States" }, { "name": "Wen Tao Liang", "org": "Pennsylvania State University(Pennsylvania State University,The Pennsylvania State University,Pennsylvania State Univ),State College,United States" }, { "name": "Jiang Wei Wang", "org": "University of Pittsburgh(University of Pittsburgh),Pittsburgh,United States" }, { "name": "Jeong-Hyun Cho", "org": "Los Alamos National Laboratory(Los Alamos National Laboratory,Los Alamos Natl Lab),Los Alamos,United States" }, { "name": "Eric Epstein", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Shadi Shadi Dayeh", "org": "Los Alamos National Laboratory(Los Alamos National Laboratory,Los Alamos Natl Lab),Los Alamos,United States" }, { "name": "Tom Tom Picraux", "org": "Los Alamos National Laboratory(Los Alamos National Laboratory,Los Alamos Natl Lab),Los Alamos,United States" }, { "name": "Ting Zhu", "org": "The George W. Woodruff School of Mechanical Engineering(Georgia Institute of Technology),Atlanta,United States" }, { "name": "Ju Li", "org": "University of Pennsylvania(University of Pennsylvania),Philadelphia,United States" }, { "name": "John P. Sullivan", "org": "Sandia National Laboratories, New Mexico(Sandia National Laboratories,Sandia Natl Lab),Albuquerque,United States" }, { "name": "John Cumings", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Chunsheng Wang", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Scott X Mao", "org": "University of Pittsburgh(University of Pittsburgh),Pittsburgh,United States" }, { "name": "Zhi Zhen Ye", "org": "State Key Laboratory of Silicon Material Science(Zhejiang University),Hangzhou,China" }, { "name": "Sulin Zhang", "org": "Pennsylvania State University(Pennsylvania State University,The Pennsylvania State University,Pennsylvania State Univ),State College,United States" }, { "name": "Jian Yu Huang", "org": "Sandia National Laboratories, New Mexico(Sandia National Laboratories,Sandia Natl Lab),Albuquerque,United States" } ], "venue": "Nano Letters", "year": 2011 }, "vxazjBlF": { "id": "vxazjBlF", "title": "A High-Performance Li-B-H Electrolyte for All-Solid-State Li Batteries", "abstract": "", "keywords": "", "authors": [ { "name": "Fuqiang Lu", "org": "School of Materials Science and Engineering; University of Shanghai for Science and Technology; Shanghai 200093 China" }, { "name": "Yuepeng Pang", "org": "School of Materials Science and Engineering; University of Shanghai for Science and Technology; Shanghai 200093 China" }, { "name": "Mengfei Zhu", "org": "School of Materials Science and Engineering; University of Shanghai for Science and Technology; Shanghai 200093 China" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" }, { "name": "Junhe Yang", "org": "School of Materials Science and Engineering; University of Shanghai for Science and Technology; Shanghai 200093 China" }, { "name": "Fang Fang", "org": "Department of Materials Science; Fudan University; Shanghai 200433 China" }, { "name": "Dalin Sun", "org": "Department of Materials Science; Fudan University; Shanghai 200433 China" }, { "name": "Shiyou Zheng", "org": "School of Materials Science and Engineering; University of Shanghai for Science and Technology; Shanghai 200093 China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering; University of Maryland; College Park MD 20742 USA" } ], "venue": "Advanced Functional Materials", "year": 2019 }, "aRSZA0xI": { "id": "aRSZA0xI", "title": "Porous Amorphous FePO 4 Nanoparticles Connected by Single-Wall Carbon Nanotubes for Sodium Ion Battery Cathodes", "abstract": "", "keywords": [], "authors": [ { "name": "yonglin liu", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "xiaogang han", "org": "" }, { "name": "chris pellegrinelli", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "hongli zhu", "org": "" }, { "name": "jiayu wan", "org": "" }, { "name": "alex chong chung", "org": "" }, { "name": "oeyvind vaaland", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "liangbing hu", "org": "" } ], "venue": "Nano Letters", "year": 2012 }, "MPEHVPC0": { "id": "MPEHVPC0", "title": "Compositions and Formation Mechanisms of Solid-Electrolyte-Interphase (SEI) on Microporous Carbon/Sulfur Cathodes", "abstract": "", "keywords": "", "authors": [ { "name": "Luning Wang", "org": "" }, { "name": "Yuxiao Lin", "org": "" }, { "name": "Samantha DeCarlo", "org": "" }, { "name": "Yi Wang", "org": "" }, { "name": "Kevin Leung", "org": "" }, { "name": "Yue Qi", "org": "" }, { "name": "Kang Xu", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Bryan W. Eichhorn", "org": "" } ], "venue": "Chemistry of Materials", "year": 2020 }, "rSWAiuoH": { "id": "rSWAiuoH", "title": "4.0 V Aqueous Li-Ion Batteries", "abstract": "Summary Although recent efforts have expanded the stability window of aqueous electrolytes from 1.23 V to u003e3 V, intrinsically safe aqueous batteries still deliver lower energy densities (200 Wh/kg) compared with state-of-the-art Li-ion batteries (∼400 Wh/kg). The essential origin for this gap comes from their stability limit, excluding the use of the most ideal anode materials (graphite, Li metal). Here, we resolved this cathodic challenge by adopting an inhomogeneous approach, in which a fluorinated additive immiscible with aqueous electrolyte can be applied on anode surfaces as an interphase precursor coating. The strong hydrophobicity of the precursor minimizes the competitive water reduction during interphase formation, while its own reductive decomposition forms a unique composite interphase consisting of both organic and inorganic fluorides. Such effective protection allows these high-capacity/low-potential anode materials to couple with different cathode materials, leading to 4.0 V aqueous Li-ion batteries with high efficiency and reversibility.", "keywords": "", "authors": [ { "name": "Chongyin Yang", "org": "" }, { "name": "Ji Chen", "org": "" }, { "name": "Tingting Qing", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Wei Sun", "org": "" }, { "name": "Arthur v. Cresce", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Michael S. Ding", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Oleg Borodin", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Jenel Vatamanu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783, USA" }, { "name": "Marshall A. Schroeder", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Nico Eidson", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Nico Eidson", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, US Army Research Laboratory, Adelphi, MD 20783, USA" } ], "venue": "Joule", "year": 2017 }, "uZZM86sK": { "id": "uZZM86sK", "title": "High electronic conductivity as the origin of lithium dendrite formation within solid electrolytes", "abstract": "Solid electrolytes (SEs) are widely considered as an ‘enabler’ of lithium anodes for high-energy batteries. However, recent reports demonstrate that the Li dendrite formation in Li7La3Zr2O12 (LLZO) and Li2S–P2S5 is actually much easier than that in liquid electrolytes of lithium batteries, by mechanisms that remain elusive. Here we illustrate the origin of the dendrite formation by monitoring the dynamic evolution of Li concentration profiles in three popular but representative SEs (LiPON, LLZO and amorphous Li3PS4) during lithium plating using time-resolved operando neutron depth profiling. Although no apparent changes in the lithium concentration in LiPON can be observed, we visualize the direct deposition of Li inside the bulk LLZO and Li3PS4. Our findings suggest the high electronic conductivity of LLZO and Li3PS4 is mostly responsible for dendrite formation in these SEs. Lowering the electronic conductivity, rather than further increasing the ionic conductivity of SEs, is therefore critical for the success of all-solid-state Li batteries.", "keywords": "", "authors": [ { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Andrew S. Westover", "org": "Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA" }, { "name": "Jie Yue", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" }, { "name": "Miaofang Chi", "org": "Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, USA" }, { "name": "Donovan N. Leonard", "org": "Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA" }, { "name": "Nancy J. Dudney", "org": "Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA" }, { "name": "Howard Wang", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, USA" } ], "venue": "Nature Energy", "year": 2019 }, "VODkiUnM": { "id": "VODkiUnM", "title": "Experimental Study on Electrochemical Compression of Ammonia and Carbon Dioxide for Vapor Compression Refrigeration System", "abstract": "•Proposed an electrochemical compressor running with ammonia or carbon dioxide.•Demonstrated the compression efficiency of 90% with NH3 electrochemical compressor.•Discussed semi-isothermal compression to enhance the compression efficiency.•Designed scaled-up compressor with improved gas distribution and heat transfer.", "keywords": [ "Electrochemical compressor", "Ion exchange membrane", "Ammonia refrigeration", "Carbon dioxide refrigeration" ], "authors": [ { "name": "Ye Tao", "org": "Center for Environmental Energy Engineering, University of Maryland, 4164 Glenn L. Martin Hall Bldg., College Park, MD 20742, USA" }, { "name": "Yunho Hwang", "org": "Center for Environmental Energy Engineering, University of Maryland, 4164 Glenn L. Martin Hall Bldg., College Park, MD 20742, USA" }, { "name": "Reinhard Radermacher", "org": "Center for Environmental Energy Engineering, University of Maryland, 4164 Glenn L. Martin Hall Bldg., College Park, MD 20742, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, 1223A Chemical & Nuclear Engineering Bldg., University of Maryland, College Park, MD 20742, USA" } ], "venue": "International Journal of Refrigeration", "year": 2019 }, "fAF01sCc": { "id": "fAF01sCc", "title": "The Center for Research on Extreme Batteries", "abstract": "", "keywords": "", "authors": [ { "name": "Eric D. Wachsman", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Cynthia Lundgren", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Esther Takeuchi", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Kang Xu", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Chunsheng Wang", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Joseph A. Dura", "org": "" }, { "name": "David L. Jacobson", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "Kahlil Amine", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" }, { "name": "William Acker", "org": "aEnergy Research Center, University of Maryland, College Park, Maryland 20742, USA" } ], "venue": "The Electrochemical Society interface", "year": 2016 }, "hJMGtljq": { "id": "hJMGtljq", "title": "Colloidal spray pyrolysis: A new fabrication technology for nanostructured energy storage materials", "abstract": "Abstract Spray pyrolysis is a scalable process to fabricate functional particles as cathode/anode materials in rechargeable batteries from precursor solutions. However, one prerequisite of spray pyrolysis to achieve uniform particle-to-particle composition and structure is a stable precursor solution, restricting its usage to highly soluble salts. Otherwise, extremely acidic precursors are necessary to ease the uncontrollable hydrolysis of the salts and the subsequent precipitation. Moreover, strong reducing agents such as H 2 are also needed for complete solid-state reactions, introducing potential safety concerns. Herein, for the first time, we develop a novel process, colloidal spray pyrolysis (CSP), which can eliminate all the prerequisites simultaneously. Our process can generate particles directly from a multiphase precursor in mild processing conditions through in-situ solid-state reactions. The product structure and composition can be precisely designed based on aerosol dynamics and reaction kinetics. By applying CSP, Sn@C particles with three distinct interior nanostructures have been synthesized and evaluated as anodes for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The best performing Sn@C anode delivers 627.9 mAh/g at 2 C with capacity retention of 88.5% after 1500 cycles in LIBs and demonstrates superior rate capability for SIBs. This novel CSP process is promising in preparing electrode materials in LIBs and SIBs for future practical applications.", "keywords": "", "authors": [ { "name": "Yujia Liang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Huajun Tian", "org": "" }, { "name": "Huajun Tian", "org": "" }, { "name": "Joseph Repac", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Sz-Chian Liou", "org": "AIM Lab, NanoCenter, University of Maryland, College Park, MD 20742, USA" }, { "name": "Ji Chen", "org": "" }, { "name": "Wei-Qiang Han", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China" }, { "name": "Wei-Qiang Han", "org": "Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Sheryl H. Ehrman", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Sheryl H. Ehrman", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" } ], "venue": "Energy Storage Materials", "year": 2018 }, "7NobleGs": { "id": "7NobleGs", "title": "In Situ Transmission Electron Microscopy Study of Electrochemical Sodiation and Potassiation of Carbon Nanofibers", "abstract": "", "keywords": [], "authors": [ { "name": "chunsheng wang", "org": "" }, { "name": "ting zhu", "org": "" }, { "name": "david i bigio", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "katherine l jungjohann", "org": "" }, { "name": "hailong chen", "org": "" }, { "name": "jiangwei wang", "org": "" }, { "name": "feifei fan", "org": "" }, { "name": "ying liu", "org": "" } ], "venue": "Nano Letters", "year": 2014 }, "4RkGqAxw": { "id": "4RkGqAxw", "title": "Self-Regulated Phenomenon of Inorganic Artificial Solid Electrolyte Interphase for Lithium Metal Batteries.", "abstract": "Solid electrolyte interphase (SEI) is crucial for suppressing Li dendrite growth in high-energy lithium metal (LiM) batteries. Unfortunately, the naturally formed SEI on the LiM anode surface in carbonate electrolytes cannot suppress Li dendrites, resulting in a continuous consumption of electrolytes and LiM during cycling. Artificial SEI normally lacks self-healing and self-regulating capability, gradually losing the effectiveness during cycling. In this work, we report the self-regulating phenomenon of LiRAP-ASEI that can effectively suppress Li dendrites and is investigated using in situ optical microscopy and COMSOL multiphysics simulation. The effectiveness of self-regulated LiRAP-ASEI is further evaluated in the most aggressive Li/sulfur cells with a lean electrolyte (10 μL mAh) and LiRAP-ASEI/LiM (2.5-fold excess of LiM). The LiRAP@Cu∥sulfur@C cells show a stable 3000 cycle life at a current density of 11.5 mA cm. The self-regulated phenomenon holds great promise for the development of high-energy-density LMBs.", "keywords": [ "cryogenic electron microscopy", "inorganic artificial SEI", "lithium metal batteries", "self-regulated phenomenon" ], "authors": [ { "name": "Bing Han", "org": "Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China." }, { "name": "Dongyu Feng", "org": "Department of Materials Science & Engineering, Shenzhen Key Laboratory of Solid-State Batteries, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." }, { "name": "Shuai Li", "org": "Department of Physics, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." }, { "name": "Zhen Zhang", "org": "Department of Materials Science & Engineering, Shenzhen Key Laboratory of Solid-State Batteries, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." }, { "name": "Yucheng Zou", "org": "Department of Materials Science & Engineering, Shenzhen Key Laboratory of Solid-State Batteries, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." }, { "name": "Meng Gu", "org": "Department of Materials Science & Engineering, Shenzhen Key Laboratory of Solid-State Batteries, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." }, { "name": "Hong Meng", "org": "Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China." }, { "name": "Chaoyang Wang", "org": "Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China." }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Sensors and Electron Devices Directorate, US Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States." }, { "name": "Yusheng Zhao", "org": "Department of Physics, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." }, { "name": "Hongbo Zeng", "org": "Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States." }, { "name": "Yonghong Deng", "org": "Department of Materials Science & Engineering, Shenzhen Key Laboratory of Solid-State Batteries, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China." } ], "venue": "Nano letters", "year": 2020 }, "CKLFh4VV": { "id": "CKLFh4VV", "title": "Self-Healing Chemistry between Organic Material and Binder for Stable Sodium-Ion Batteries", "abstract": "Summary One of the major challenges for high-energy sodium-ion batteries is the mechanical fracture triggered by large volume change. To circumvent pulverization-induced capacity decay, self-healing chemistry between binder and active material is critical but is never reported. Here, we report a self-healing electrode with hydrogen bonding between an oxygen-rich active material, sodium rhodizonate dibasic (SRD), and a hydroxyl-rich binder, sodium alginate (SA). During the sodiation of microsized SRD, cracks induced by volume expansion expose a new oxygen-rich surface, whereas the SA binder fills these cracks under pressure generated by volume expansion and binds the pulverized SRD together by hydrogen bonding between SRD and SA. Self-healing between hydroxyl-rich binder and oxygen-rich active material is a universal strategy for mitigating the pulverization-induced capacity decay of active materials, as demonstrated by the longer cycle life of the SRD electrode with other hydroxyl-rich binders, polyacrylic acid, and xanthan gum than with hydroxyl-free polytetrafluoroethylene binder.", "keywords": "", "authors": [ { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Zhaohui Ma", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" } ], "venue": "Chem", "year": 2017 }, "tjYgqmYu": { "id": "tjYgqmYu", "title": "A lithiation/delithiation mechanism of monodispersed MSn5 (M = Fe, Co and FeCo) nanospheres", "abstract": "", "keywords": [], "authors": [ { "name": "fengxia xin", "org": "chinese academy of sciences" }, { "name": "xiaoliang wang", "org": "chinese academy of sciences" }, { "name": "jianming bai", "org": "brookhaven national laboratory" }, { "name": "wen wen", "org": "chinese academy of sciences" }, { "name": "huajun tian", "org": "chinese academy of sciences" }, { "name": "chunsheng wang", "org": "university of maryland college park" }, { "name": "weiqiang han", "org": "chinese academy of sciences" } ], "venue": "", "year": 2015 }, "9TGASXPC": { "id": "9TGASXPC", "title": "A Universal Organic Cathode for Ultrafast Li- and Multivalent Metal Batteries.", "abstract": "Low-cost multivalent battery chemistries (Mg2+, Al3+) have been extensively investigated for large-scale energy storage applications. However, their commercialization is plagued by the poor power density and cycle life of cathodes. A universal polyimides@CNT (PI@CNT) cathode is now presented that can reversibly store various cations with different valences (Li+, Mg2+, Al3+) at an extremely fast rate. The ion-coordination charge storage mechanism of PI@CNT is systemically investigated. Full cells using PI@CNT cathodes and corresponding metal anodes exhibit long cycle life (>10000 cycles), fast kinetics (>20C), and wide operating temperature range (-40 to 50 degrees C), making the low-cost industrial polyimides universal cathodes for different multivalent metal batteries. The stable ion-coordinated mechanism opens a new foundation for the development of high-energy and high-power multivalent batteries.", "keywords": [ "aluminum", "lithium ion batteries", "magnesium", "multivalent batteries", "organic cathodes" ], "authors": [ { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Fei Wang", "org": "US Army Res Lab, Power & Energy Div, Sensor & Electron Devices Directorate, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "Xiao Ji", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ruixing Wang", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Tao Gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Singyuk Hou", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Tao Deng", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiaogang Li", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Long Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Luning Wang", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ANGEWANDTE CHEMIE-INTERNATIONAL EDITION", "year": 2018 }, "TuyCtMbF": { "id": "TuyCtMbF", "title": "Architecturing Hierarchical Function Layers on Self-Assembled Viral Templates as 3D Nano-Array Electrodes for Integrated Li-Ion Microbatteries", "abstract": "", "keywords": [], "authors": [ { "name": "chunsheng wang", "org": "" }, { "name": "yujie zhu", "org": "" }, { "name": "wei zhang", "org": "" }, { "name": "yihang liu", "org": "" }, { "name": "yuan wang", "org": "" }, { "name": "kang xu", "org": "" }, { "name": "c a lundgren", "org": "" }, { "name": "james n culver", "org": "" }, { "name": "adam brown", "org": "" }, { "name": "yunhua xu", "org": "" }, { "name": "yanting luo", "org": "" } ], "venue": "Nano Letters", "year": 2013 }, "nfULjos1": { "id": "nfULjos1", "title": "Flexible ReS2 nanosheets/N-doped carbon nanofibers-based paper as a universal anode for alkali (Li, Na, K) ion battery", "abstract": "Alkali (Li, Na, K) ion battery have practically or potentially been widely used as a power source for portable electronic devices and electric vehicles. However, lack of universal anodes for these three alkali ion battery are restricting their development, especially for Na-ion battery and K-ion battery. Rhenium disulfide (ReS2), with large interlayer space and weak van der Waals interaction between layers, can afford massive alkali (lithium, sodium, and potassium) ions to diffuse easily between the layers. However, its low electronic conductivity and large volume changes in the conversion reaction significantly compromise the cycle life. To address this issue, here, we anchor ReS2 nanosheets onto nitrogen doped carbon nanofibers (N-CNF) which forms a flexible ReS2/N-CNFs paper for alkali (Li, Na, and K) ion battery anodes. The carbon nanofibers (CNFs) can improve the conductivity and the doped nitrogen can absorb sulfur and polysulfide generated by the conversion reaction. As a result, the ReS2/N-CNFs composite anode maintains a reversible capacity of 430 mAh/g after 400 cycles at 100 mA/g in LIBs, 245 mAh/g after 800 cycles at 100 mA/g in NIBs, and 253 mAh/g after 100 cycles at 50 mA/g in KIBs. This performance is one of the best among all ReS2 reported up to date. In addition, the solid electrolyte interface formation on ReS2 and the coulombic efficiency in different alkali ion batteries are also systemically investigated.", "keywords": [ "Universal anode", "ReS2", "N-doped carbon nanofibers", "Alkali (Li", "Na", "and K) ion battery" ], "authors": [ { "name": "Minglei Mao", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China;Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States;" }, { "name": "Chunyu Cui", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China;" }, { "name": "Mingguang Wu", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China;" }, { "name": "Ming Zhang", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China;" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States;" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States;" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States;" }, { "name": "Taihong Wang", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China;" }, { "name": "Jianmin Ma", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China;" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States;" } ], "venue": "Nano Energy", "year": 2018 }, "V4JGReHz": { "id": "V4JGReHz", "title": "High rate performance of virus enabled 3D n-type Si anodes for lithium-ion batteries", "abstract": "A patterned 3D Si anode is fabricated by physical vapor deposition of n-type Si on a self-assembled TMV1cys-structured nickel current collector. The combination of the large surface area conferred by the virus-enabled 3D Ni/TMV1cys current collector with the high electric conductivity of n-type Si rods results in excellent cyclic stability and rate capability for the core-shell n-type Si/Ni/TMV1cys anodes. Electrochemical impedance spectroscopy reveals that the high electronic conductivity of n-type Si significantly reduces charge transfer resistance, thus even at high current densities the capacity of the n-type Si is increased to almost 630 mAh/g compared to undoped Si.", "keywords": [ "3d structure", "rate performance", "n-type si", "lithium-ion battery", "tobacco mosaic virus", "surface area", "charge transfer", "physical vapor deposition", "electrochemical impedance spectroscopy", "nickel", "current density", "electric conductivity" ], "authors": [ { "name": "Xilin Chen", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland College Park, MD 20742, USA" }, { "name": "Konstantinos Gerasopoulos", "org": "Department of Materials Science and Engineering, Institute for Systems Research, Department of Electrical and Computer Engineering, University of Maryland College Park, MD 20742, USA" }, { "name": "Juchen Guo", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland College Park, MD 20742, USA" }, { "name": "Adam Brown", "org": "Institute for Bioscience and Biotechology Research, Department of Plant Science and Landscape Architecture,University of Maryland College Park, MD 20742, USA" }, { "name": "Reza Ghodssi", "org": "Department of Materials Science and Engineering, Institute for Systems Research, Department of Electrical and Computer Engineering, University of Maryland College Park, MD 20742, USA" }, { "name": "James N. Culver", "org": "Institute for Bioscience and Biotechology Research, Department of Plant Science and Landscape Architecture,University of Maryland College Park, MD 20742, USA" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Electrochimica Acta", "year": 2011 }, "aYr5FyLB": { "id": "aYr5FyLB", "title": "Sponge-like porous carbon/tin composite anode materials for lithium ion batteries", "abstract": "", "keywords": [], "authors": [ { "name": "yunhua xu", "org": "university of maryland college park" }, { "name": "juchen guo", "org": "university of maryland college park" }, { "name": "chunsheng wang", "org": "university of maryland college park" } ], "venue": "Journal of Materials Chemistry", "year": 2012 }, "E1jNE9kB": { "id": "E1jNE9kB", "title": "Activation of Oxygen‐Stabilized Sulfur for Li and Na Batteries", "abstract": "The sulfur-based cathode materials suffer severely from poor cycling stability and low utilization, incurred by their stepwise reaction mechanism that generates polysulfide intermediates and the subsequent irreversible losses. In this work, those issues are significantly relieved by entrapping sulfur species in carbon host rich in oxygen functionalities. Sulfur species in such C/S composite are highly stabilized by their interaction with oxygen, and can deliver a reversible capacity of 508 mAh/(g of S) for 2000 cycles when coupled with Li, representing the best cycling stability up to date. More interestingly, extra capacity can be accessed by simply prelithiating the oxygen-stabilized C/S composites down to 0.6 V for a few cycles, which enables a high capacity of 1621 mAh/(g of S) that eventually stabilizes at 820 mAh/(g of S) for 600 cycles. The mechanism for this electrochemical activation process is investigated with both spectroscopic and electrochemical techniques, which reveal that the inactive sulfur bonded to oxygen is liberated in the initial deep lithiation precycles and becomes electrochemically active. The oxygen-stabilized sulfur can also be coupled with Na anode to form Na/S cell, confirming that the formation of S-O interaction in C/S composite generates promising sulfur-based cathode materials for Li-S and Na-S batteries.", "keywords": [ "composites", "electrochemical activation", "lithium sulfur batteries", "oxygen stabilized carbon", "sulfur", "oxygen-sulfur bonds", "sodium sulfur batteries" ], "authors": [ { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "oleg borodin", "org": "US Army, Res Lab, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "tao gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "xiulin fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "yunhua xu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "kang xu", "org": "US Army, Res Lab, Electrochem Branch, Adelphi, MD 20783 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2015 }, "eQGDefZk": { "id": "eQGDefZk", "title": "All-temperature batteries enabled by fluorinated electrolytes with non-polar solvents", "abstract": "", "keywords": "", "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering University of Maryland,College Park,USA" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Long Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Tao Deng", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Jie Yue", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Nan Piao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park,,USA" }, { "name": "Ruixing Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland College Park,,USA" }, { "name": "Xiuquan Zhou", "org": "Department of Chemistry and Biochemistry, University of Maryland College Park,,USA" }, { "name": "Xuezhang Xiao", "org": "State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang University Hangzhou China" }, { "name": "Lixin Chen", "org": "State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang University Hangzhou China" }, { "name": "Chunsheng Wang", "org": "Department of Chemistry and Biochemistry, University of Maryland, College Park,,USA" } ], "venue": "Nature Energy", "year": 2019 }, "vg4IgTqX": { "id": "vg4IgTqX", "title": "Solid‐State Lithium/Selenium–Sulfur Chemistry Enabled via a Robust Solid‐Electrolyte Interphase", "abstract": "Lithium/selenium-sulfur batteries have recently received considerable attention due to their relatively high specific capacities and high electronic conductivity. Different from the traditional encapsulation strategy for suppressing the shuttle effect, an alternative approach to directly bypass polysulfide/polyselenide formation via rational solid-electrolyte interphase (SEI) design is demonstrated. It is found that the robust SEI layer that in situ forms during charge/discharge via interplay between rational cathode design and optimal electrolytes could enable solid-state (de)lithiation chemistry for selenium-sulfur cathodes. Hence, Se-doped S22.2Se/Ketjenblack cathodes can attain a high reversible capacity with minimal shuttle effects during long-term and high rate cycling. Moreover, the underlying solid-state (de)lithiation mechanism, as evidenced by in situ Li-7 NMR and in operando synchrotron X-ray probes, further extends the optimal sulfur confinement pore size to large mesopores and even macropores that have been long considered as inferior sulfur or selenium host materials, which play a crucial role in developing high volumetric energy density batteries. It is expected that the findings in this study will ignite more efforts to tailor the compositional/structure characteristics of the SEI layers and the related ionic transport across the interface by electrode structure, electrolyte solvent, and electrolyte additive screening.", "keywords": [ "(de)lithiation chemistry", "cathode", "electrolytes", "selenium-sulfur", "solid-electrolyte interphase" ], "authors": [ { "name": "Gui‐Liang Xu", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Hui Sun", "org": "State Key Laboratory of Heavy Oil Processing Institute of New Energy China University of Petroleum‐Beijing Beijing 102249 China" }, { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Luis Estevez", "org": "Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA" }, { "name": "Minghao Zhuang", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Han Gao", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Rachid Amine", "org": "Materials Science Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Hao Wang", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Xiaoyi Zhang", "org": "X‐Ray Science Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Cheng‐Jun Sun", "org": "X‐Ray Science Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Yuzi Liu", "org": "Center for Nanoscale Materials Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Yang Ren", "org": "X‐Ray Science Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Steve M. Heald", "org": "X‐Ray Science Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA" }, { "name": "Zonghai Chen", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Khalil Amine", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" }, { "name": "Khalil Amine", "org": "Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2019 }, "903iL5Og": { "id": "903iL5Og", "title": "Hybrid Mg2+/Li+ Battery with Long Cycle Life and High Rate Capability", "abstract": "", "keywords": [ "daniel cells", "dendrite-free magnesium anodes", "electrolyte-compatible cathodes", "high reversibility", "mixed-ion electrolytes" ], "authors": [ { "name": "tao gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "fudong han", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "yujie zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "liumin suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" }, { "name": "kang xu", "org": "US Army Res Lab, Electrochem Branch, Power & Energy Div, Sensor & Electron Devices Directorate, Adelphi, MD 20783 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA" } ], "venue": "ADVANCED ENERGY MATERIALS", "year": 2015 }, "ULvLHGwQ": { "id": "ULvLHGwQ", "title": "Interphase Engineering Enabled All-Ceramic Lithium Battery", "abstract": "Summary Solid-state batteries (SSBs) can essentially improve battery safety. Garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) is considered one of the most promising solid electrolytes for SSBs. However, the performance of LLZO-based SSBs is limited by the large cathode/electrolyte interfacial resistance. High-rate and long-cycling SSBs were achieved only after adding flammable polymer or liquid electrolyte in the cathode at the sacrifice of safety. Here, we show that an all-ceramic cathode/electrolyte with an extremely low interfacial resistance can be realized by thermally soldering LiCoO 2 (LCO) and LLZO together with the Li 2.3−x C 0.7+x B 0.3−x O 3 solid electrolyte interphase through the reaction between the Li 2.3 C 0.7 B 0.3 O 3 solder and the Li 2 CO 3 layers that can be conformally coated on both LLZO and LCO. The all-solid-state Li/LLZO/LCO battery with such an all-ceramic cathode/electrolyte exhibits high cycling stability and high rate performance, constituting a significant step toward the practical applications of SSBs.", "keywords": "", "authors": [ { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Jie Yue", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Cheng Chen", "org": "State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China" }, { "name": "Ning Zhao", "org": "State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Zhaohui Ma", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" }, { "name": "Xiangxin Guo", "org": "State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA" } ], "venue": "Joule", "year": 2018 }, "QZ2Rxqk2": { "id": "QZ2Rxqk2", "title": "Hoop-strong nanotubes for battery electrodes.", "abstract": "The engineering of hollow nanostructures is a promising approach to addressing instabilities in silicon-based electrodes for lithium-ion batteries. Previous studies showed that a SiOx coating on silicon nanotubes (SiNTs) could function as a constraining layer and enhance capacity retention in electrodes with low mass loading, but we show here that similarly produced electrodes having negligible SiOx coating and significantly higher mass loading show relatively low capacity retention, fading quickly within the early cycles. We find that the SiNT performance can still be enhanced, even in electrodes with high mass loading, by the use of Ni functional coatings on the outer surface, leading to greatly enhanced capacity retention in a manner that could scale better to industrially relevant battery capacities. In situ transmission electron microscopy studies reveal that the Ni coatings suppress the Si wall from expanding outward, instead carrying the large hoop stress and forcing the Si to expand inward toward the hollow inner core. Evidence shows that these controlled volume changes in Ni-coated SiNTs, accompanied by the electrochemically inert nature of Ni coatings, unlike SiOx, may enhance the stability of the electrolyte at the outer surface against forming a thick solid electrolyte interphase (SEI) layer. These results provide useful guidelines for designing nanostructured silicon electrodes for viable lithium-ion battery applications.", "keywords": [ "silicon nanotubes", "nickel coating", "SEI", "in situ TEM", "stability" ], "authors": [ { "name": "Khim Karki", "org": "Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States." }, { "name": "Yujie Zhu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Yihang Liu", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chuan-Fu Sun", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Liangbing Hu", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" }, { "name": "YuHuang Wang", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "John Cumings", "org": "Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA" } ], "venue": "ACS nano", "year": 2013 }, "MuYDxpfa": { "id": "MuYDxpfa", "title": "Electrospun FeS2@Carbon Fiber Electrode as a High Energy Density Cathode for Rechargeable Lithium Batteries", "abstract": "In this study, an FeS2@carbon fiber electrode is developed with FeS2 nanoparticles either embedded in or attached to carbon fibers by using an electrospinning method. By applying this binder -free, metal-current,collector-free FeS2@carbon fiber electrode, both the redox reaction and capacity decay mechanisms for the Li FeS2 system are revealed by changing the electrolyte (conventional carbonate electrolyte and a \"solvent -in -salt\" -type Li S battery electrolyte) and working voltage ranges (1.0-3.0 V and 1.5-3.0 V vs Li/Li+). The FeS2@carbon fiber electrode shows stable cycling performance in both the conventional' carbonate electrolyte and the solvent -in -salt -type Li S battery.electrolyte in the voltage range of 1.5-3.0 V. Electrochemical tests in the solvent -in -salt -type Li S battery electrolyte indicate that the Li-FeS2 system becomes a hybrid of the Li S cell and Li iron sulfide cell after the initial cycle. Based on the understanding on the capacity decay mechanisms, the cycling stability of the Li FeS2 system in the voltage range of 1.0-3.0 V is then significantly enhanced by coating the FeS2@carbon fiber electrode with a thin layer of Al2O3. The Al2O3-coated electrode demonstrates excellent cycling performance with high discharge energy densities at both the material level (similar to 300 Wh/kgFeS(2)) and the electrode level (similar to 000 Wh/kg-FeS2 electrode).", "keywords": [ "atomic layer deposition", "electrospinning" ], "authors": [ { "name": "yujie zhu", "org": "Beihang Univ, Sch Chem & Environm, Beijing 100191, Peoples R China" }, { "name": "xiulin fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "liumin suo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chao luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "tao gao", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "chunsheng wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "", "year": 2015 }, "JBN8DDOE": { "id": "JBN8DDOE", "title": "Micro-sized nano-porous Si/C anodes for lithium ion batteries", "abstract": "The unique micro-sized (2–10 µm) Si/C composites consisting of 20 nm carbon coated secondary Si were synthesized from the abundant and low cost Al–Si alloy ingot by acid etching, ball-milling and carbonization procedure. The nano-porous Si/C composites provide a capacity of 1182 mAh g−1 at a current density of 50 mAg−1, 952 mAh g−1 at 200 mAg−1, 815 mAh g−1 at 500 mAg−1, and maintain 86.8% of initial capacity after 300 cycles. Even at a much higher current density of 10 A/g, the porous Si/C anode can still provide capacities of >200 mAh g−1. Its superior rate capability and cycling stability of micro-sized nano-porous Si/C anodes is because it takes advantage of both long cycle life of nano-Si and high volumetric/gravimetric capacity of micro-Si. The hierarchical porous micro-scale Si/C with the carbon coating can stabilize the SEI layer and the inside pore provides adequate space for Si expansion, relaxing the stress/strain. The hierarchical Si/C with exceptional electrochemical performance is prepared by a simple, low-cost and saleable synthesis method, making it very promising for a large-scale production of high-performance Si-based anode materials in high-energy lithium-ion batteries.", "keywords": [ "Lithium-ion batteries", "Micro-sized", "Si/C", "Anode", "Hierarchical structure" ], "authors": [ { "name": "huajun tian", "org": "" }, { "name": "xiaojian tan", "org": "" }, { "name": "fengxia xin", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "weiqiang han", "org": "" } ], "venue": "Nano Energy", "year": 2015 }, "VQOSjSj3": { "id": "VQOSjSj3", "title": "“ Water-in-Salt ” electrolyte enabled LiMn 2 O 4 / TiS 2 Lithium-ion batteries", "abstract": "Abstract High electrochemical reversibility of the TiS 2 anode in “Water-in-Salt” electrolyte (21 m LiTFSI in H 2 O) is demonstrated for the first time. The wide electrochemical window and low chemical activity of H 2 O in the “Water-in-Salt” electrolyte not only significantly enhanced the electrochemical reversibility of TiS 2 but also effectively suppressed the hydrolysis side reaction in the aqueous electrolyte. Paired with a LiMn 2 O 4 cathode, the LiMn 2 O 4 /TiS 2 full cell delivers a relatively high discharge voltage of 1.7 V and an energy density of 78 Wh kg − 1 as well as a satisfactory rate performance.", "keywords": "", "authors": [ { "name": "Wei Sun", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Wei Sun", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Liumin Suo", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Fei Wang", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Nico Eidson", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Chongyin Yang", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Fudong Han", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Zhaohui Ma", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Tao Gao", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" }, { "name": "Min Zhu", "org": "School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Bimolecular Engineering, University of Maryland, College Park, MD 20740, USA" } ], "venue": "Electrochemistry Communications", "year": 2017 }, "BVrCBh7R": { "id": "BVrCBh7R", "title": "Flexible ReS 2 Nanosheets/N-doped Carbon Nanofibers-Based Paper as a Universal Anode for Alkali (Li, Na, K) Ion Battery", "abstract": "Abstract Alkali (Li, Na, K) ion battery have practically or potentially been widely used as a power source for portable electronic devices and electric vehicles. However, lack of universal anodes for these three alkali ion battery are restricting their development, especially for Na-ion battery and K-ion battery. Rhenium disulfide (ReS 2 ), with large interlayer space and weak van der Waals interaction between layers, can afford massive alkali (lithium, sodium, and potassium) ions to diffuse easily between the layers. However, its low electronic conductivity and large volume changes in the conversion reaction significantly compromise the cycle life. To address this issue, here, we anchor ReS 2 nanosheets onto nitrogen doped carbon nanofibers (N-CNF) which forms a flexible ReS 2 /N-CNFs paper for alkali (Li, Na, and K) ion battery anodes. The carbon nanofibers (CNFs) can improve the conductivity and the doped nitrogen can absorb sulfur and polysulfide generated by the conversion reaction. As a result, the ReS 2 /N-CNFs composite anode maintains a reversible capacity of 430 mAh/g after 400 cycles at 100 mA/g in LIBs, 245 mAh/g after 800 cycles at 100 mA/g in NIBs, and 253 mAh/g after 100 cycles at 50 mA/g in KIBs. This performance is one of the best among all ReS 2 reported up to date. In addition, the solid electrolyte interface formation on ReS 2 and the coulombic efficiency in different alkali ion batteries are also systemically investigated.", "keywords": "", "authors": [ { "name": "Minglei Mao", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Minglei Mao", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Chunyu Cui", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Mingguang Wu", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Ming Zhang", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Ji Chen", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Taihong Wang", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Jianmin Ma", "org": "School of Physics and Electronics, Hunan University, Changsha 410082, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" } ], "venue": "Nano Energy", "year": 2018 }, "h6fDabe3": { "id": "h6fDabe3", "title": "Sulfur-impregnated disordered carbon nanotubes cathode for lithium-sulfur batteries.", "abstract": "The commercialization of lithium-sulfur batteries is hindered by low cycle stability and low efficiency, which are induced by sulfur active material loss and polysulfide shuttle reaction through dissolution into electrolyte. In this study, sulfur-impregnated disordered carbon nanotubes are synthesized as cathode material for the lithium-sulfur battery. The obtained sulfur-carbon tube cathodes demonstrate superior cyclability and Coulombic efficiency. More importantly, the electrochemical characterization indicates a new stabilization mechanism of sulfur in carbon induced by heat treatment.", "keywords": [ "carbon nanotube" ], "authors": [ { "name": "Juchen Guo", "org": "Department of Chemical and Biomolecular Engineering University of Maryland , College Park, Maryland 20742, United States." }, { "name": "Yunhua Xu", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano letters", "year": 2011 }, "qX6JKiGh": { "id": "qX6JKiGh", "title": "Architecturing hierarchical function layers on self-assembled viral templates as 3D nano-array electrodes for integrated Li-ion microbatteries.", "abstract": "This work enables an elegant bottom-up solution to engineer 3D microbattery arrays as integral power sources for microelectronics. Thus, multilayers of functional materials were hierarchically architectured over tobacco mosaic virus (TMV) templates that were genetically modified to self-assemble in a vertical manner on current-collectors, so that optimum power and energy densities accompanied with excellent cycle-life could be achieved on a minimum footprint. The resultant microbattery based on self-aligned LiFePO(4) nanoforests of shell-core-shell structure, with precise arrangement of various auxiliary material layers including a central nanometric metal core as direct electronic pathway to current collector, delivers excellent energy density and stable cycling stability only rivaled by the best Li-ion batteries of conventional configurations, while providing rate performance per foot-print and on-site manufacturability unavailable from the latter. This approach could open a new avenue for microelectromechanical systems (MEMS) applications, which would significantly benefit from the concept that electrochemically active components be directly engineered and fabricated as an integral part of the integrated circuit (IC).", "keywords": [ "tobacco mosaic virus", "lifepo4 nanoforests", "nanohierarchy", "integral power for microelectronics", "magnetron sputtering", "3d microbattery arrays" ], "authors": [ { "name": "Yihang Liu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Wei Zhang", "org": "Sichuan University(Sichuan University),Chengdu,China" }, { "name": "Yujie Zhu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Yanting Luo", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Yunhua Xu", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Adam Brown", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "James N Culver", "org": "University of Maryland(University of Maryland),College Park,United States" }, { "name": "Cynthia A Lundgren", "org": "U.S. Army Research Laboratory(U.S. Army Research Laboratory,Army Research Laboratory,U.S. Army Research Lab),Adelphi,United States" }, { "name": "Kang Xu", "org": "U.S. Army Research Laboratory(U.S. Army Research Laboratory,Army Research Laboratory,U.S. Army Research Lab),Adelphi,United States" }, { "name": "Yuan Wang", "org": "Sichuan University(Sichuan University),Chengdu,China" }, { "name": "Chunsheng Wang", "org": "University of Maryland(University of Maryland),College Park,United States" } ], "venue": "Nano letters", "year": 2013 }, "kxsDkHyX": { "id": "kxsDkHyX", "title": "High power rechargeable magnesium/iodine battery chemistry", "abstract": "Rechargeable magnesium batteries suffer from slow solid-state Mg2+ diffusion in the intercalation cathode. Here the authors show magnesium/iodine chemistry in which the liquid–solid two-phase reaction leads to increased rate capabilities by overcoming the sluggish kinetics.", "keywords": "", "authors": [ { "name": "Huajun Tian", "org": "" }, { "name": "Tao Gao", "org": "" }, { "name": "Xiaogang Li", "org": "" }, { "name": "Xiwen Wang", "org": "" }, { "name": "Chao Luo", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Liumin Suo", "org": "" }, { "name": "Zhaohui Ma", "org": "" }, { "name": "Wei-Qiang Han", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nature Communications", "year": 2017 }, "zKRsMU0s": { "id": "zKRsMU0s", "title": "Cyclability study of silicon–carbon composite anodes for lithium-ion batteries using electrochemical impedance spectroscopy", "abstract": "The effects of carbonization process and carbon nanofiber/nanotube additives on the cycling stability of silicon–carbon composite anodes were investigated by monitoring the impedance evolution during charge/discharge cycles with electrochemical impedance spectroscopy (EIS). Three types of Si–C anodes were investigated: the first type consisted of Si nanoparticles incorporated into a network of carbon nanofibers (CNFs) and multi-walled carbon nanotubes (MWNTs), with annealed polymer binder. The second type of Si–C anodes was prepared by further heat treatment of the first Si–C anodes to carbonize the polymer binder. The third Si–C anode was as same as the second one except no CNFs and MWNTs being added. Impedance analysis revealed that the carbonization process stabilized the Si–C anode structure and decreased the charge transfer resistance, thus improving the cycling stability. On the other hand, although the MWNTs/CNFs additives could enhance the electronic conductivity of the Si–C anodes, the induced inhomogeneous structure decreased the integrity of the electrode, resulting in a poor long term cycling stability.", "keywords": [ "li-ion battery", "carbon nanotube", "silicon anode", "cyclic stability", "electrochemical impedance spectroscopy", "charge transfer", "carbon nanofiber", "heat treatment" ], "authors": [ { "name": "Juchen Guo", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Ann Sun", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Xilin Chen", "org": "Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Ayyakkannu Manivannan", "org": "US Department of Energy, National Energy Technology Laboratory, Morgantown, WV 26507, United States" } ], "venue": "Electrochimica Acta", "year": 2011 }, "8WNCvGbG": { "id": "8WNCvGbG", "title": "Pipe-Wire TiO2–Sn@Carbon Nanofibers Paper Anodes for Lithium and Sodium Ion Batteries", "abstract": "Metallic tin has been considered as one of the most promising anode materials both for lithium (LIBs) and sodium ion battery (NIBs) because of a high theoretical capacity and an appropriate low discharge potential. However, Sn anodes suffer from a rapid capacity fading during cycling due to pulverization induced by severe volume changes. Here we innovatively synthesized pipe-wire TiO2–Sn@carbon nanofibers (TiO2–Sn@CNFs) via electrospinning and atomic layer deposition to suppress pulverization-induced capacity decay. In pipe-wire TiO2–Sn@CNFs paper, nano-Sn is uniformly dispersed in carbon nanofibers, which not only act as a buffer material to prevent pulverization, but also serve as a conductive matrix. In addition, TiO2 pipe as the protection shell outside of Sn@carbon nanofibers can restrain the volume variation to prevent Sn from aggregation and pulverization during cycling, thus increasing the Coulombic efficiency. The pipe-wire TiO2–Sn@CNFs show excellent electrochemical performance as anodes for bot...", "keywords": "", "authors": [ { "name": "Minglei Mao", "org": "" }, { "name": "Feilong Yan", "org": "" }, { "name": "Chunyu Cui", "org": "" }, { "name": "Jianmin Ma", "org": "" }, { "name": "Ming Zhang", "org": "" }, { "name": "Taihong Wang", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano Letters", "year": 2017 }, "ZUW14Hg6": { "id": "ZUW14Hg6", "title": "Layered P2-Type K0.65Fe0.5Mn0.5O2 Microspheres as Superior Cathode for High-Energy Potassium-Ion Batteries", "abstract": "Potassium-ion batteries have been regarded as the potential alternatives to lithium-ion batteries (LIBs) due to the low cost, earth abundance, and low potential of K (-2.936 vs standard hydrogen electrode (SHE)). However, the lack of low-cost cathodes with high energy density and long cycle life always limits its application. In this work, high-energy layered P2-type hierarchical K0.65Fe0.5Mn0.5O2 (P2-KFMO) microspheres, assembled by the primary nanoparticles, are fabricated via a modified solvent-thermal method. Benefiting from the unique microspheres with primary nanoparticles, the K+ intercalation/deintercalation kinetics of P2-KFMO is greatly enhanced with a stabilized cathodic electrolyte interphase on the cathode. The P2-KFMO microsphere presents a highly reversible potassium storage capacity of 151 mAh g(-1) at 20 mA g(-1), fast rate capability of 103 mAh g(-1) at 100 mA g(-1), and long cycling stability with 78% capacity retention after 350 cycles. A full cell with P2-KFMO microspheres as cathode and hard carbon as anode is constructed, which exhibits long-term cycling stability (>80% of retention after 100 cycles). The present high-performance P2-KFMO microsphere cathode synthesized using earth-abundant elements provides a new cost-effective alternative to LIBs for large-scale energy storage.", "keywords": [ "earth-abundant cathode materials", "energy storage", "K0.65Fe0.5Mn0.5O2", "layered transition-metal oxides", "potassium-ion batteries" ], "authors": [ { "name": "Tao Deng", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiulin Fan", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Ji Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Long Chen", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Chao Luo", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" }, { "name": "Xiuquan Zhou", "org": "Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA" }, { "name": "Junhe Yang", "org": "Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China" }, { "name": "Shiyou Zheng", "org": "Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China" }, { "name": "Chunsheng Wang", "org": "Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA" } ], "venue": "ADVANCED FUNCTIONAL MATERIALS", "year": 2018 }, "8r2ZtOUm": { "id": "8r2ZtOUm", "title": "High energy-density and reversibility of iron fluoride cathode enabled via an intercalation-extrusion reaction.", "abstract": "Iron fluoride, an intercalation-conversion cathode for lithium ion batteries, promises a high theoretical energy density of 1922 Wh kg However, poor electrochemical reversibility due to repeated breaking/reformation of metal fluoride bonds poses a grand challenge for its practical application. Here we report that both a high reversibility over 1000 cycles and a high capacity of 420 mAh g can be realized by concerted doping of cobalt and oxygen into iron fluoride. In the doped nanorods, an energy density of ~1000 Wh kg with a decay rate of 0.03% per cycle is achieved. The anion's and cation's co-substitutions thermodynamically reduce conversion reaction potential and shift the reaction from less-reversible intercalation-conversion reaction in iron fluoride to a highly reversible intercalation-extrusion reaction in doped material. The co-substitution strategy to tune the thermodynamic features of the reactions could be extended to other high energy conversion materials for improved performance.", "keywords": "", "authors": [ { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Enyuan Hu", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA." }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Yizhou Zhu", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Fudong Han", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Sooyeon Hwang", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA." }, { "name": "Jue Liu", "org": "Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA." }, { "name": "Seongmin Bak", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA." }, { "name": "Zhaohui Ma", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Tao Gao", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Sz-Chian Liou", "org": "Maryland Nanocenter, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Jianming Bai", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA." }, { "name": "Xiao-Qing Yang", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA." }, { "name": "Yifei Mo", "org": "Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA." }, { "name": "Kang Xu", "org": "Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD, 20783, USA." }, { "name": "Dong Su", "org": "Brookhaven National Laboratory, Upton, NY, 11973, USA. dsu@bnl.gov." }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA. cswang@umd.edu." } ], "venue": "Nature communications", "year": 2018 }, "T5C3aOWB": { "id": "T5C3aOWB", "title": "Antimony Nanorod Encapsulated in Cross-linked Carbon for High-Performance Sodium Ion Battery Anodes.", "abstract": "Antimony (Sb) based materials have been considered as one of promising anodes for sodium ion batteries (SIBs) owing to their high theoretical capacities and appropriate sodium inserting potentials. So far, the reported energy density and cycling stability of the Sb based anodes for SIBs are quite limited and need to be significantly improved. Here, we develop a novel Sb/C hybrid encapsulating the Sb nanorods into highly conductive N & S co-doped carbon (Sb@(N, S-C)) frameworks. As an anode for SIBs, the Sb@(N, S-C) hybrid maintains high reversible capacities of 621.1 mAh g-1 at 100 mA g-1 after 150 cycles, and 390.8 mAh g-1 at 1 A g-1 after 1000 cycles. At higher current densities of 2, 5 and 10 A g-1, the Sb@(N, S-C) hybrid also can display high reversible capacities of 534.4, 430.8 and 374.7 mAh g-1, respectively. Such impressive sodium storage properties are mainly attributed to the unique cross-linked carbon networks providing highly conductive frameworks for fast transfer of ions and electrons, alleviating the volume expansion and preventing the agglomeration of Sb nanorods during the cycling.", "keywords": "", "authors": [ { "name": "Chunyu Cui", "org": "" }, { "name": "Jiantie Xu", "org": "" }, { "name": "Yiqiong Zhang", "org": "" }, { "name": "Zengxi Wei", "org": "" }, { "name": "Minglei Mao", "org": "" }, { "name": "Xin Lian", "org": "" }, { "name": "Shuangyin Wang", "org": "" }, { "name": "Chongyin Yang", "org": "" }, { "name": "Xiulin Fan", "org": "" }, { "name": "Jianmin Ma", "org": "" }, { "name": "Chunsheng Wang", "org": "" } ], "venue": "Nano letters", "year": 2018 }, "FVBHpJZ5": { "id": "FVBHpJZ5", "title": "An Oxide Ion and Proton Co-Ion Conducting Sn[sub 0.9]In[sub 0.1]P[sub 2]O[sub 7] Electrolyte for Intermediate-Temperature Fuel Cells", "abstract": "", "keywords": [], "authors": [ { "name": "Xilin Chen", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "E. Andrew Payzant", "org": "" }, { "name": "Changrong Xia", "org": "" }, { "name": "Deryn Chu", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2008 }, "epZ9yn2m": { "id": "epZ9yn2m", "title": "High interfacial-energy interphase promoting safe lithium metal batteries.", "abstract": "Engineering a stable solid electrolyte interphase (SEI) is critical for suppression of lithium dendrites. However, formation of desired SEI by formulating electrolyte composition is very difficult due to complex electrochemical reduction reactions. Here, instead of try-and-error of electrolyte composition, we design a Li-11 wt% Sr alloy anode to form SrF2-rich SEI in fluorinated electrolytes. Density functional theory (DFT) calculation and experimental characterization demonstrate that SrF2-rich SEI has a large interfacial energy with Li metal and a high mechanical strength, which can effectively suppress the Li dendrite growth by simultaneously promoting the lateral growth of deposited Li metal and the SEI stability. The Li-Sr/Cu cells in 2M LiFSI-DME shows an outstanding Li plating/stripping Coulombic efficiency of 99.42% at 1 mA cm-2 with a ca-pacity of 1 mAh cm-2 and 98.95% at 3 mA cm-2 with a capacity of 2 mAh cm-2, respectively. The symmetric Li-Sr/Li-Sr cells also achieve a stable electrochemical performance of 180 cycles at an extremely high current density of 30 mA cm-2 with a capacity of 1 mAh cm-2. When paired with LiFePO4 (LFP) and LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes, Li-Sr/LFP cells in 2M LiFSI-DME electrolytes and Li-Sr/NMC811 cells in 1M LiPF6 in FEC:FEMC:HFE electrolytes also maintain excellent capacity retention. Designing SEI by regulating Li metal anode composition opens up a new and rational avenue to suppress Li dendrites.", "keywords": "", "authors": [ { "name": "Sufu Liu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Xiao Ji", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Jie Yue", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Singyuk Hou", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Peng-Fei Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Chunyu Cui", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Ji Chen", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" }, { "name": "Bowen Shao", "org": "Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States" }, { "name": "Jinru Li", "org": "State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science& Engineering, Zhejiang University, Hangzhou 310027, China" }, { "name": "Fudong Han", "org": "Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States" }, { "name": "Jiangping Tu", "org": "State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science& Engineering, Zhejiang University, Hangzhou 310027, China" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20740, United States" } ], "venue": "Journal of the American Chemical Society", "year": 2020 }, "xjX34Fxs": { "id": "xjX34Fxs", "title": "P2-type transition metal oxides for high performance Na-ion battery cathodes", "abstract": "The particle pulverization induced by volume change and the disproportionation reaction of Mn3+ to Mn4+ and electrolyte-soluble Mn2+ are two major challenges for Na0.67MnO2 cathodes in Na-ion batteries. Herein, Ni and/or Fe doped Na0.67MnO2 was synthesized to suppress the particle pulverization and disproportionation reaction. The replacement of 33% Mn ions by Ni in Na0.67MnO2 can effectively reduce the particle pulverization and disproportionation of Mn3+, resulting in improved cycling stability at the cost of reduced capacity. To develop a high capacity and long cycle life cathode material, Ni in Na0.67Ni0.33Mn0.67O2 is further partially substituted by Fe to generate Na0.67Fe0.20Ni0.15Mn0.65O2, which retains ∼70% of its initial capacity after 900 cycles, corresponding to a very low capacity decay rate of 0.033% per cycle. To the best of our knowledge, the Na0.67Fe0.20Ni0.15Mn0.65O2 synthesized by ultrasonic spray pyrolysis (USP) represents one of the best cathode materials for Na-ion batteries to date. In addition, a thin layer (5 nm) of Al2O3 is deposited on the Na0.67MnO2 electrode by atomic layer deposition (ALD) to further reduce the dissolution of Mn ions and accommodate the volume change, which further extend the cycling stability of Na0.67MnO2 electrodes.", "keywords": "", "authors": [ { "name": "Chao Luo", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Alex Langrock", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Xiulin Fan", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Yujia Liang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" } ], "venue": "Journal of Materials Chemistry", "year": 2017 }, "ZjjL3vuZ": { "id": "ZjjL3vuZ", "title": "Cut-and-stack nanofiber paper toward fast transient energy storage", "abstract": "Transient technology allows a device to disappear upon application of an external trigger. The difference between a transient energy storage device and conventional one is this ability to vanish to human eyes when needed. For the first time, a symmetric vanadium oxide (V2O5) microbattery with transient energy storage capabilities was designed and developed in this work. A V2O5 nanofiber paper, lithiated V2O5 nanofiber paper, and an electrospun polyvinylpyrrolidone (PVP) nanofiber paper were used as the positive electrode, negative electrode, and the porous membrane, respectively. All these components are electrochemically stable in the organic electrolyte battery devices, but are chemically dissoluble in alkaline, once triggered. These paper structures have small diffusion distances, resulting in good transient capability. The nanostructures also enable high-rate discharge, which is essential for transient electronic systems. Miniature battery arrays using the paper-like electrodes and separator were produced through a simple cut-and-stack process, which then can be wire-bonded to systems with radio-frequency identification (RFID) technologies.", "keywords": "", "authors": [ { "name": "Zhen Liu", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" }, { "name": "Kun Fu", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" }, { "name": "Zhengyang Wang", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" }, { "name": "Yujie Zhu", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Jiayu Wan", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" }, { "name": "Yonggang Yao", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" }, { "name": "Jiaiqi Dai", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" }, { "name": "Myeongseob Kim", "org": "BAE Systems,Columbia,USA" }, { "name": "Laura A. Swafford", "org": "BAE Systems,Columbia,USA" }, { "name": "Chunsheng Wang", "org": "Department of Chemical and Biomolecular Engineering, University of Maryland,College Park,USA" }, { "name": "Liangbing Hu", "org": "Department of Materials Science and Engineering, University of Maryland,College Park,USA" } ], "venue": "Inorganic chemistry frontiers", "year": 2016 }, "0GpnIwUn": { "id": "0GpnIwUn", "title": "A survey of the conditions of nursing personnel resources in Huzhou", "abstract": "[Objective]The paper aims at providing some basis for a reasonable allocation of the nursing personnel resources in this region by learning the conditions of nursing personnel resources in Huzhou.[Method]The data,collected from a general survey of the registered nursing personnel at different types and levels medical organizations in Huzhou,was analyzed statistically by the software SPSS for Windows 11.0.[Result]The average number of nursing personnel is 1.02 per thousand inhabitants. The ratio of the beds to nurses is 1:0.33,and the nurses with associate's degree and higher account for 20.1%,with vice high- level professional titles account for 1.1%,and with middle - level professional titles account for 21.5%.There is a normal correlation between the average level of educational backgrounds and professional titles and the regional grades of the medical organization(P< 0.001).96%of the nursing personnel with vice high-level professional titles haven't got bachelor' s degree and higher,55.0%the nursing personnel with middle - level professional titles haven't got associate's degree and higher,and 15.2%of the nursing personnel with primary - level professional titles haven't received nursing secondary school or higher education.[Conclusion]There is a severe shortage of the total allocation of nursing personnel,the lower level of educational backgrounds on the whole,and the inadequate proportions of personnel with middle and high - level professional titles. The lower educational degrees and professional titles the personnel have,the lower regional grades the medical organizations are.The higher professional titles the personnel have,the more of them haven't got the required educational degrees.Therefore, the heart of improving the personnel's professional levels is to better their educational backgrounds.", "keywords": [ "personnel resources", "nursing" ], "authors": [ { "name": "CHEN Wan-yu", "org": "The Medical School of Huzhou Normal College,Zhejiang ,China" }, { "name": "WANG Chun-sheng", "org": "The Medical School of Huzhou Normal College,Zhejiang ,China" } ], "venue": "Zhejiang Medical Education", "year": 2005 }, "wev2Wu9q": { "id": "wev2Wu9q", "title": "A survey to the situation of clinical personnel resources in Huzhou", "abstract": "Objective To investigate the situation of clinical personnel resources in Huzhou,and to provide theoretical basis for the(rational) allocation of regional clinical resources.Methods The data,which were collected from a general survey of the registered clinicians of all kinds of medical organizations in Huzhou,were analyzed with the statistical software of SPSS for Windows ver12.0.1.(Results) The average number of clinical personnel was 1.42 per one thousand inhabitants.The ratio of the sickbeds to clinicians was 2.17;and the clinicians with graduate(bachelor) degree or higher degree accounted for 26.3%;nearly half(47.2%) of clinicians owned the degree of middle-level and junior,while the rate even reached 73.1% in the hospitals of villages and towns;the ratios of clinicians with senior professional titles to middle and to junior were 1 ∶2.5 ∶5.2;there was a positive correlation between the level of educational backgrounds or professional titles and the regional grades of the medical organization(P<0.000).Conclusion There was a sever lack of the total allocation of clinical personnel,and the total level of educational background was low;the ratio of clinicians with senior professional titles to middle and to junior was not rather rational,which meant a not so good composition exhibited by fewer clinicians with higher professional titles in particular.The lower grades the regional medical organizations were,the lower educational level or professional titles the clinicians had.We suggest that further measures should be taken to recommend talented clinicians to work in Huzhou city from outside,to strengthen the continuous education and refresh course of knowledge and skills.", "keywords": [ "personnel resources", "clinical medicine", "survey to the current situation" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Medical School of Huzhou Normal College,Huzhou,Zhejiang ,China" }, { "name": "CHEN Wan-yu", "org": "Medical School of Huzhou Normal College,Huzhou,Zhejiang ,China" }, { "name": "JIANG Pei-yu", "org": "Medical School of Huzhou Normal College,Huzhou,Zhejiang ,China" } ], "venue": "Journal of Hangzhou Teachers College(Medical Edition)", "year": 2006 }, "dfwdYCFg": { "id": "dfwdYCFg", "title": "Research About the Countermeasure of Development of General Medical Talent in Rural Communities", "abstract": "", "keywords": [], "authors": [ { "name": "SHEN Zhi-kun", "org": ",WU Kai-li 1.Faculty of Medicine,Huzhou Teachers College,,China 2.Huzhou Health Department,Huzhou,,China" }, { "name": "JIANG Pei-yu", "org": ",WU Kai-li 1.Faculty of Medicine,Huzhou Teachers College,,China 2.Huzhou Health Department,Huzhou,,China" }, { "name": "CHEN Wan-yu", "org": ",WU Kai-li 1.Faculty of Medicine,Huzhou Teachers College,,China 2.Huzhou Health Department,Huzhou,,China" }, { "name": "WANG Chun-sheng", "org": ",WU Kai-li 1.Faculty of Medicine,Huzhou Teachers College,,China 2.Huzhou Health Department,Huzhou,,China" } ], "venue": "Medicine Teaching in University(Electronic Edition)", "year": 2012 }, "AmrAnDQC": { "id": "AmrAnDQC", "title": "Study on Asp~(578)Gly mutation of luteinizing hormone receptor in girls of idiopathic central precocious puberty", "abstract": "Objective:To identify the relationship between female idiopathic central precocious puberty(ICPP)and Asp578 Gly mutation of luteinizing hormone receptor(LHR).Methods:Sixteen girls diagnosed as ICPP were as subjects.The oral swab sample were taken from every patient.Genomic DNA was amplified by polymerase chain reaction,using primers of 5'-CAC TGC TGG CTT TTT CAC-TGT ATT-3' and 5'TGA AGG CAG CTG AGA TGG CAA AAA-3'.Then,PCR product was treated with MspⅠ to examine a transition of A to G of nucleotide 1733 of LHR cDNA.Results:Asp578mutation of LHR were not identified in the sixteen girls.Conclusion:Asp578 mutation of LH receptor gene is not the cause of ICPP of female.", "keywords": [ "Mutation", "Luteinizing hormone receptor", "Idiopathic central precocious puberty(ICPP)" ], "authors": [ { "name": "WANG Chun-Sheng", "org": ",et al.School of Medicine,Huzhou Normal University,Huzhou ,Zhejiang,China" }, { "name": "XU Yong", "org": ",et al.School of Medicine,Huzhou Normal University,Huzhou ,Zhejiang,China" }, { "name": "JIANG Pei-Yu", "org": ",et al.School of Medicine,Huzhou Normal University,Huzhou ,Zhejiang,China" } ], "venue": "Maternal and Child Health Care of China", "year": 2008 }, "a1hcUGcT": { "id": "a1hcUGcT", "title": "Rural community health technicians analysis and countermeasures", "abstract": "From the status quo of medical and health services in rural areas,there exist the following problems:the insufficient number of clinicians,low quality of clinicians,the imbalance of the professional ranks and titles,and aging.Based on investigation and analysis of the rural community health technicians of Huzhou City,Zhejiang Province,the author put forward the new countermeasures of orientation training clinicians in rural communities according to the rural communities residents new demand for medical and health services.", "keywords": [ "Analysis of the status quo", "Health and teohnical personnel", "Rural communities" ], "authors": [ { "name": "SHEN Zhi-kun", "org": ".Faculty of Medicine,Huzhou Normal College,Huzhou ,China" }, { "name": "QIAN Jin-fang", "org": ".Faculty of Medicine,Huzhou Normal College,Huzhou ,China" }, { "name": "JIANG Pei-yu", "org": ".Faculty of Medicine,Huzhou Normal College,Huzhou ,China" }, { "name": "YE Ming-quan", "org": ".Faculty of Medicine,Huzhou Normal College,Huzhou ,China" }, { "name": "WANG Chun-sheng", "org": ".Faculty of Medicine,Huzhou Normal College,Huzhou ,China" }, { "name": "WANG Bing", "org": ".Faculty of Medicine,Huzhou Normal College,Huzhou ,China" } ], "venue": "Researches in Medical Education", "year": 2009 }, "GPVrt0z6": { "id": "GPVrt0z6", "title": "INVESTIGATION AND ANALYSIS ON COGNITION AND INFLUENCING FACTORS OF HAND HYGIENE PERFORMANCE AMONG NURSES IN BASIC HOSPITAL", "abstract": "[Objective]To know the condition of hand hygiene of nursing staffs in basic hospital in order to provide basis for improving hand hygiene administration.[Methods]By means of the self-designed questionnaire,a survey was made among 137 nursing staffs.[Results]The nurses had good knowledge about hand hygiene,especially on the hand hygiene indication;There were no significant differences in knowledge among nurses with different age,educational background,professional title and health-care settings;The first three factors that influenced on the performance of hand hygiene were irritation and dryness caused by hand-washing agents(76.6%),heavy workload(65.0%),lack of hand hygiene facility(62.8%).[Conclusion]It is necessary to improve the performance of hand hygiene of the nurses in basic hospital.Some methods can be used,such as improving hand hygiene facility,enhancing the training and education,monitoring hand hygiene and so on.", "keywords": [ "Hand hygiene", "Basic hospital", "Nursing staffs", "Hospital infection" ], "authors": [ { "name": "GU Fu-ping", "org": "Faculty of Medicine,Huzhou Teachers College,Huzhou ,China" }, { "name": "DAI Mei-qin", "org": "Faculty of Medicine,Huzhou Teachers College,Huzhou ,China" }, { "name": "WANG Chun-sheng", "org": "Faculty of Medicine,Huzhou Teachers College,Huzhou ,China" } ], "venue": "Modern Preventive Medicine", "year": 2011 }, "V8VP1VAd": { "id": "V8VP1VAd", "title": "Study of Safety Loading of Container in Transporting Goods", "abstract": "The cause of goods damaged in circulating is not only bad packing and ill management,but also improper transporting and loading.The paper carries out mechanical analysis of the weight distributing of goods in loading container based on analysis of packing and tansporting environment,and draws the formula of the ratio of the weight of loading goods and the maximum loading weight W/W0,and the length distributing ratio of loading goods α=l/L under the condition that the bending quadrature produced by part load is within the range of the maximum bending quadrature.It also gives the graph that the sum deflection of mudsill and underside girder can reach high-point value with the length of bottom distributing varying,when the loading amounts of container of 20ft and 40ft are given.Furthermore,it provides the relation graph of an eccentric rate of loading goods and the allowed loading amount.For on-site safety loading work,it has certain guidance and reference value.", "keywords": [ "safety loading", "mechanical analysis", "container", "load distribution" ], "authors": [ { "name": "WANG Chun-sheng", "org": "School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou ,China" } ], "venue": "Journal of Lanzhou Jiaotong University", "year": 2009 }, "KBIiu3Xh": { "id": "KBIiu3Xh", "title": "Evacuation Schemes for Fire in Two-direction Tunnel", "abstract": "The theoretical analysis and experimental validation were carried out to study the fire with different scales and the propagation velocities of smoke in two-direction tunnel with U-turn lane and emergency parking strip.The results show that(1)the propagation velocity of the fire smoke can be controlled through adjusting the blowing direction of ventilation system and the numbers of blowers;(2) the control of fire accidents can be divided into three stages(fire developing stage,evacuating stage,extinguishing stage):in the developing stage propagation velocity of the fire smoke should be controlled to less than 0.5 m/s to damp the evolution of fire;in evacuating stage the smoke should be controlled to move along the direction to the nearest outlet of the tunnel,and the velocity of airflow should be controlled to move faster than that of smoke;in the last stage the airflow velocity should be greater than 2.5 m/s,and airflow should be directed to the nearest outlet of the tunnel.In each stage,the vehicles should be evacuated along the old direction in sequence,in reversal direction or return with moving to the emergency parking strip first.", "keywords": [ "evacuation scheme", "tunnel engineering", "U-turn lane", "two-direction tunnel", "parking strip", "model experiment" ], "authors": [ { "name": "WANG Chunsheng", "org": "School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou Gansu ,China" } ], "venue": "Journal of Highway and Transportation Research and Development", "year": 2009 }, "E3XUZm5p": { "id": "E3XUZm5p", "title": "Numerical Analysis of Heat Transfer of Dangerous Goods Container", "abstract": "There are many factors influencing the safety of railway transportation of dangerous goods by container.One of the important factors is the temperature of goods in container.The temperature changes with the ambient air temperatures,direct solar radiation and thermal radiation of the earth and objects around the container.At the same time the loading mode of goods in container and the physical properties of the goods also have effects on the temperature of goods.The heat transfer process is very complicated.There is no solid base to estimate the temperatures by experience and according to such temperatures to dertermine the transportation conditions of dangerous goods by container. This paper simulates heat transfer of the container by means of the finite element method.The heat transfer model for a container is established.Numerical simulation is made for the typical climate under the most unfavorable conditions.Compared with experimental results,it is found that the heat transfer model of the container is reasonable,and some valuable information for safe railway transportation of dangerous goods by container can be obtained from such analysis.", "keywords": [ "dangerous goods", "railway transport", "numerical analysis", "container", "heat transfer" ], "authors": [ { "name": "WANG Chun-sheng", "org": "School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou ,China" }, { "name": "TENG Shuai", "org": "School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou ,China" }, { "name": "WANG Xiao-hui", "org": "School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou ,China" } ], "venue": "Journal of the China Railway Society", "year": 2008 }, "j1JSKdRA": { "id": "j1JSKdRA", "title": "Research on Safety Transportation of Tank Containing Gas on Railways", "abstract": "The current safety problems existing in transporting tanks containing gas on railways are analyzed,then the deep research on four links of safety,such as package,upload,transporting check and safety on the way is carried out in order to do the management before using.", "keywords": [ "gas", "safe transportation", "tank on railways", "research" ], "authors": [ { "name": "Wang Chunsheng", "org": "School of Traffic and Transportation Engineering,Lanzhou Jiaotong University,Lanzhou ,China" } ], "venue": "Journal of Lanzhou Jiaotong University", "year": 2007 }, "TqyiNGlT": { "id": "TqyiNGlT", "title": "Characteristic Analysis of Flue Gas Movement of Single-hole Double-direction Tunnel on Mountain Highway in Fires", "abstract": "The characteristics of the flue gas movement during a sudden fire in the single-hole double-direction highway tunnel are studied to give scientific basis for the design of ventilation system and easing plan in fires.Scale of fires in tunnel、regular pattern of fires changing with the temperature and spreading feature of flue gas are analyzed using the method of theoretical analysis and ex-perimental check.The conclusion is that the diffusing con-centration and spreading area of flue gas could be con-trolled when conditions for flue gas forcibly diffusing and requirements for disaster prevention are comprehensi-vely considered and the air stream controlling scheme is reasonably designed.", "keywords": [ "highway", "tunnel engineering", "fire", "flue gas" ], "authors": [ { "name": "WANG Chun-sheng", "org": "School of Traffic & Transportation,Lanzhou Jiaotong University,Lanzhou,Gansu ,China" } ], "venue": "Railway Transport and Economy", "year": 2009 }, "fsTDX7pN": { "id": "fsTDX7pN", "title": "Buffer Performance and Application of Discarded Agricultural Plant Fibre Pad", "abstract": "Through the static compression test of discarded agricultural plant fibre pad, the essay compares the stress-strain curve (σ-ε) among the plant fibre buffer pad, honeycomb cardboard and EPS foam, and draws theC-σm, C-εand C -E curves of plant fibre pad for buffer design. In the end, the essay studies the application of this type of pad in railway mass goods transportation.", "keywords": [ "plant fibre pad", "static compression test", "buffer performance" ], "authors": [ { "name": "DU Juan", "org": "School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, Gansu , China" }, { "name": "WANG Chun-sheng", "org": "School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, Gansu , China" } ], "venue": "Railway Freight Transport", "year": 2007 }, "27wmkeSu": { "id": "27wmkeSu", "title": "Research on the Algorithm Based on Bus Signal Priority", "abstract": "Bus priority means providing priority signals with advanced inspection system to public transport vehicles.Taking into consideration that signal priority for bus shall impact on other vehicles,the paper puts forward bus signal priority algorithms based on frequency and based on demand intensity with target of providing priority signal for bus at one hand,and reducing average vehicle delay at crossings on the other hand.", "keywords": [ "priority strategy", "bus priority", "bus priority algorithm", "bus signal priority" ], "authors": [ { "name": "SUN Wen-tao", "org": "School of Traffic & Transportation,Lanzhou Jiaotong University,Lanzhou,Gansu ,China" }, { "name": "WANG Chun-sheng", "org": "School of Traffic & Transportation,Lanzhou Jiaotong University,Lanzhou,Gansu ,China" }, { "name": "MA Wen-yu", "org": "School of Traffic & Transportation,Lanzhou Jiaotong University,Lanzhou,Gansu ,China" }, { "name": "SUN Li-yong", "org": "School of Traffic & Transportation,Lanzhou Jiaotong University,Lanzhou,Gansu ,China" } ], "venue": "Railway Transport and Economy", "year": 2008 }, "lSy2aIkz": { "id": "lSy2aIkz", "title": "Common-mode differential-mode (CMDM) method for double-nuclear MR signal excitation and reception at ultrahigh fields.", "abstract": "Double-tuned radio-frequency (RF) coils for heteronuclear mangentic resonance (MR) require sufficient electromagnetic isolation between the two resonators operating at two Larmor frequencies and independent tuning in order to attain highly efficient signal acquisition at each frequency. In this work, a novel method for double-tuned coil design at 7T based on the concept of common-mode differential-mode (CMDM) was developed and tested. Common mode (CM) and differential mode (DM) currents exist within two coupled parallel transmission lines, e.g., microstrip lines, yielding two different current distributions. The electromagnetic (EM) fields of the CM and DM are orthogonal to each other, and thus, the two modes are intrinsically EM decoupled. The modes can be tuned independently to desired frequencies, thus satisfying the requirement of dual-frequency MR applications. To demonstrate the feasibility and efficiency of the proposed CMDM technique, CMDM surface coils and volume coils using microstrip transmission line for (1)H and (13)C MRI/MRSI were designed, constructed, and tested at 7T. Bench test results showed that the isolations between the two frequency channels of the CMDM surface coil and volume coil were better than -30 and -25 dB, respectively. High quality MR phantom images were also obtained using the CMDM coils. The performance of the CMDM technique was validated through a comparison with the conventional two-pole design method at 7T. The proposed CMDM technique can be also implemented by using other coil techniques such as lumped element method, and can be applied to designing double-tuned parallel imaging coil arrays. Furthermore, if the two resonant modes of a CMDM coil were tuned to the same frequency, the CMDM coil becomes a quadrature coil due to the intrinsic orthogonal field distribution of CM and DM.", "keywords": [ "microstrip lines", "coils", "cmdm method", "larmor frequency", "double nuclear magnetic resonance signal excitation", "electromagnetic fields", "differential mode currents", "heteronuclear mangentic resonance", "common-mode differential-mode (cmdm)", "lumped element method", "double-tuned coil", "1h mri", "common mode currents", "biomedical equipment", "electromagnetically decoupled fields", "double nuclear magnetic resonance signal reception", "cmdm surface coils", "double tuned radiofrequency coils", "dual frequency magnetic resonance applications", "biomedical mri", "magnetic flux density 7 t", "magnetic resonance imaging (mri)", "parallel imaging transceiver array", "electromagnetic interference", "double tuned parallel imaging coil arrays", "mr phantom images", "double tuned coil design", "13c mri", "common mode differential mode method", "mrsi", "cmdm volume coils", "coupled parallel transmission lines", "electromagnetic isolation", "high field", "electro magnetic", "transmission line", "magnetic resonance image", "radio frequency", "finite difference method", "common mode", "microstrip line", "finite difference methods", "resonant frequency", "design method", "microstrip", "satisfiability", "in vivo" ], "authors": [ { "name": "Yong Pang", "org": "" }, { "name": "Xiaoliang Zhang", "org": "" }, { "name": "Zhentian Xie", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Daniel B Vigneron", "org": "" } ], "venue": "IEEE Trans. Med. Imaging", "year": 2011 }, "rEoQtdvv": { "id": "rEoQtdvv", "title": "Tailored utilization of acquired k-space points for GRAPPA reconstruction.", "abstract": "The generalized auto-calibrating partially parallel acquisition (GRAPPA) is an auto-calibrating parallel imaging technique which incorporates multiple blocks of data to derive the missing signals. In the original GRAPPA reconstruction algorithm only the data points in phase encoding direction are incorporated to reconstruct missing points in k-space. It has been recognized that this scheme can be extended so that data points in readout direction are also utilized and the points are selected based on a k-space locality criterion. In this study, an automatic subset selection strategy is proposed which can provide a tailored selection of source points for reconstruction. This novel approach extracts a subset of signal points corresponding to the most linearly independent base vectors in the coefficient matrix of fit, effectively preventing incorporating redundant signals which only bring noise into reconstruction with little contribution to the exactness of fit. Also, subset selection in this way has a regularization effect since the vectors corresponding to the smallest singular values are eliminated and consequently the condition of the reconstruction is improved. Phantom and in vivo MRI experiments demonstrate that this subset selection strategy can effectively improve SNR and reduce residual artifacts for GRAPPA reconstruction.", "keywords": [ "rf coil array", "parallel imaging", "image reconstruction", "smash", "grappa", "singular value" ], "authors": [ { "name": "Peng Qu", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong" }, { "name": "Gary X Shen", "org": "" }, { "name": "Chunsheng Wang", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong" }, { "name": "Bing Wu", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong" }, { "name": "Jing Yuan", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong" } ], "venue": "Journal of magnetic resonance (San Diego, Calif. : 1997)", "year": 2005 }, "WB8IE9TU": { "id": "WB8IE9TU", "title": "Discrepancy-based adaptive regularization for GRAPPA reconstruction.", "abstract": "To develop a novel regularization method for GRAPPA by which the regularization parameters can be optimally and adaptively chosen.In the fit procedures in GRAPPA, the discrepancy principle, which chooses the regularization parameter based on a priori information about the noise level in the autocalibrating signals (ACS), is used with the truncated singular value decomposition (TSVD) regularization and the Tikhonov regularization, and its performance is compared with the singular value (SV) threshold method and the L-curve method, respectively by axial and sagittal head imaging experiments.In both axial and sagittal reconstructions, normal GRAPPA reconstruction results exhibit a relatively high level of noise. With discrepancy-based choices of parameters, regularization can improve the signal-to-noise ratio (SNR) with only a very modest increase in aliasing artifacts. The L-curve method in all of the reconstructions leads to overregularization, which causes severe residual aliasing artifacts. The 10% SV threshold method yields good overall image quality in the axial case, but in the sagittal case it also leads to an obvious increase in aliasing artifacts.Neither a fixed SV threshold nor the L-curve are robust means of choosing the appropriate parameters in GRAPPA reconstruction. However, with the discrepancy-based parameter-choice strategy, adaptively regularized GRAPPA can be used to automatically choose nearly optimal parameters for reconstruction and achieve an excellent compromise between SNR and artifacts.", "keywords": [ "regularization" ], "authors": [ { "name": "Peng Qu", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Gary X Shen", "org": "" } ], "venue": "Journal of magnetic resonance imaging : JMRI", "year": 2006 }, "FAsboob8": { "id": "FAsboob8", "title": "Multi-channel microstrip transceiver arrays using harmonics for high field MR imaging in humans.", "abstract": "Radio-frequency (RF) transceiver array design using primary and higher order harmonics for in vivo parallel magnetic resonance imaging imaging (MRI) and spectroscopic imaging is proposed. The improved electromagnetic decoupling performance, unique magnetic field distributions and high-frequency operation capabilities of higher-order harmonics of resonators would benefit transceiver arrays for parallel MRI, especially for ultrahigh field parallel MRI. To demonstrate this technique, microstrip transceiver arrays using first and second harmonic resonators were developed for human head parallel imaging at 7T. Phantom and human head images were acquired and evaluated using the GRAPPA reconstruction algorithm. The higher-order harmonic transceiver array design technique was also assessed numerically using FDTD simulation. Compared with regular primary-resonance transceiver designs, the proposed higher-order harmonic technique provided an improved g-factor and increased decoupling among resonant elements without using dedicated decoupling circuits, which would potentially lead to a better parallel imaging performance and ultimately faster and higher quality imaging. The proposed technique is particularly suitable for densely spaced transceiver array design where the increased mutual inductance among the elements becomes problematic. In addition, it also provides a simple approach to readily upgrade the channels of a conventional primary resonator microstrip array to a larger number for faster imaging.", "keywords": [ "human head parallel imaging", "transceivers", "harmonics", "resonant elements", "resonators", "head", "ultrahigh field parallel mri", "primary-resonance transceiver designs", "first harmonic resonators", "unique magnetic field distributions", "g-factor", "decoupling", "parallel imaging", "decoupling circuits", "image reconstruction", "electromagnetic decoupling performance", "biomedical mri", "fdtd simulation", "higher quality imaging", "grappa reconstruction algorithm", "microstrip transmission line resonator", "second harmonic resonators", "electromagnetic coupling", "radiofrequency transceiver array design", "multichannel microstrip transceiver arrays", "conventional primary resonator microstrip array", "higher-order harmonic transceiver array design technique", "in vivo parallel magnetic resonance imaging", "radio-frequency (rf) coil array", "finite difference time-domain analysis", "densely spaced transceiver array design", "high field", "medical image processing", "phantom", "magnetic field", "second harmonic", "magnetic resonance image", "miniaturization", "transmission line", "microstrip", "harmonic analysis", "radio frequency", "magnetics", "high frequency", "resonant frequency", "magnetic resonance imaging", "imaging", "g factor", "higher order", "transducers" ], "authors": [ { "name": "Bing Wu", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Jonathan Lu", "org": "" }, { "name": "Yong Pang", "org": "" }, { "name": "Sarah J Nelson", "org": "" }, { "name": "Daniel B Vigneron", "org": "" }, { "name": "Xiaoliang Zhang", "org": "" } ], "venue": "IEEE Trans. Med. Imaging", "year": 2012 }, "erjWe4lO": { "id": "erjWe4lO", "title": "Evaluation of common RF coil setups for MR imaging at ultrahigh magnetic field: a numerical study", "abstract": "This study is an evaluation of the ratio of electric field to magnetic field (E/B1), specific absorption rate (SAR) and signal-to-noise ratio (SNR) generated by three different RF transceiver coil setups: surface coil, surface coil with shielding, and microstrip using a finite discrete time domain (FDTD) simulation in the presence of a head phantom. One of our main focuses in this study is to better understand coil designs that would improve patient safety at high fields by studying a coil type that may potentially minimize SAR while examining potential changes in SNR. In the presence of a human head load, the microstrip's E/B1 ratio was on average smallest while its SAR was also on average smallest of the three setups, suggesting the microstrip may be a better RF coil choice for MRI concerning patient safety and parallel excitation applications than the other two coils. In addition, the study suggests that the microstrip also has a higher SNR compared with the other two coils demonstrating the possibility that the microstrip could lead to higher quality MRI images.", "keywords": [ "High field", "RF coil", "electromagnetic calculation", "microstrip", "numerical modeling", "signal-to-noise ratio (SNR)", "specific absorption rate (SAR)" ], "authors": [ { "name": "Jonathan Lu", "org": "University of California Berkeley, Berkeley, CA, and University of California San Francisco (UCSF)" }, { "name": "Yong Pang", "org": "University of California San Francisco (UCSF)" }, { "name": "Chunsheng Wang", "org": "University of California San Francisco (UCSF)" }, { "name": "Bing Wu", "org": "University of California San Francisco (UCSF)" }, { "name": "Daniel B. Vigneron", "org": "University of California San Francisco (UCSF), and University of California- San Francisco, San Francisco, CA" }, { "name": "Xiaoliang Zhang", "org": "University of California San Francisco (UCSF), and University of California- San Francisco, San Francisco, CA" } ], "venue": "ISABEL", "year": 2011 }, "1dhQVAp3": { "id": "1dhQVAp3", "title": "Potential advantage of higher-order modes of birdcage coil for parallel imaging.", "abstract": "The potential advantages of the higher-order resonant modes of a low-pass birdcage coil for parallel imaging are investigated using FDTD simulations in a spherical phantom. Better parallel imaging performance can be achieved in axial planes than in sagittal planes. If more modes are employed, the average g-factor (gmean) and maximum g-factor (gmax) will be improved for a specific acceleration factor (R). G-factor performance at 3 T (gmean=1.79, gmax=3.55) and 7 T (gmean=1.60, gmax=2.45) can be achieved even with an acceleration factor as high as four when all six order modes of 12-rung low-pass birdcage coil are incorporated for imaging on a mid-axial plane. For a specific number of channels, the optimum combination of corresponding modes can be obtained for different acceleration factors. Based on the g-factor and SNR performance, the total degenerate multi-mode birdcage coil with six order resonant modes has better homogeneous coverage and SENSE performance than the 8-element phased array coil, although requiring fewer channels. In addition, the dielectric effects at high field can improve the parallel imaging performance.", "keywords": [ "phased array", "g factor", "fdtd", "higher order", "low pass" ], "authors": [ { "name": "Chunsheng Wang", "org": "MRI Lab, Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, PR China" }, { "name": "Peng Qu", "org": "MRI Lab, Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, PR China" }, { "name": "Gary X Shen", "org": "" } ], "venue": "Journal of magnetic resonance (San Diego, Calif. : 1997)", "year": 2006 }, "iAItsbQZ": { "id": "iAItsbQZ", "title": "Interconnecting L/C components for decoupling and its application to low-field open MRI array", "abstract": "Interconnecting L/C components are often applied to decouple the array elements for parallel Imaging. Although it has been recognized that Interconnecting capacitors and inductors can both be employed for decoupling, quantitative study of this decoupling technique has not yet been presented. In this study, a theoretical analysis for the Interconnecting L/C decoupling circuit is provided. The analysis reveals that the required decoupling capacitance decreases with the resonant frequency, whereas the decoupling inductance is independent of the frequency. The inductive decoupling scheme is applied in the design of a four-channel knee coil for 0.5 T open MRI with vertical magnetic field. Experimental results show that good isolations (-19 dB ∼ -45 dB) between coil elements can be achieved and only 5% ∼ 11% degeneration of O is caused by this decoupling method. © 2007 Wlley Periodicals, Inc.", "keywords": [ "decoupling circuit", "low-field open mri", "mutual coupling", "phased array", "rf coil" ], "authors": [ { "name": "Bing Wu", "org": "The University of Hong Kong(University of Hong Kong,The University of Hong Kong),Pokfulam,Hong Kong" }, { "name": "Peng Qu", "org": "The University of Hong Kong(University of Hong Kong,The University of Hong Kong),Pokfulam,Hong Kong" }, { "name": "Chunsheng Wang", "org": "The University of Hong Kong(University of Hong Kong,The University of Hong Kong),Pokfulam,Hong Kong" }, { "name": "Jing Yuan", "org": "The University of Hong Kong(University of Hong Kong,The University of Hong Kong),Pokfulam,Hong Kong" }, { "name": "GaryGuixiong Shen", "org": "The University of Hong Kong(University of Hong Kong,The University of Hong Kong),Pokfulam,Hong Kong" } ], "venue": "Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering", "year": 2007 }, "0zMTP4JZ": { "id": "0zMTP4JZ", "title": "Theoretical and experimental investigation of the relationship among SAR, tissues and radio frequencies in MRI.", "abstract": "The specific absorption rates (SAR) of three tissues (muscle, brain, bone) are investigated both theoretically and experimentally for MRI at the first time. Finite difference time domain (FDTD) analysis is used to simulate the average SAR of three tissues at three magnetic field strengths (0.5 T, 1.5 T, 3T). Simulations show that the SAR of muscle, brain and bone increase 7.49 folds, 10.87 folds and 12.92 folds respectively when the magnetic field strength increases from 0.5 T to 3 T. Experiments are carried out to measure SRAS of different phantoms which simulate the three human tissues at 1.5T and 3T. The experiment results agree with the simulation data very well and within only 11% difference.", "keywords": [ "fdtd", "rf safety", "sar", "radio frequency", "specific absorption rate", "magnetic field", "finite difference time domain" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "Gary X Shen", "org": "" }, { "name": "Jin Yuan", "org": "" }, { "name": "Peng Qu", "org": "" }, { "name": "Bing Wu", "org": "" } ], "venue": "Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)", "year": 2005 }, "R8fWHb7u": { "id": "R8fWHb7u", "title": "Shielded microstrip array for 7T human MR imaging.", "abstract": "The high-frequency transceiver array based on the microstrip transmission line design is a promising technique for ultrahigh field magnetic resonance imaging (MRI) signal excitation and reception. However, with the increase of radio-frequency (RF) channels, the size of the ground plane in each microstrip coil element is usually not sufficient to provide a perfect ground. Consequently, the transcei...", "keywords": [ "Microstrip antenna arrays", "Humans", "Magnetic resonance imaging", "Radio frequency", "Transceivers", "Coils", "Coaxial cables", "Stability", "Transmission lines", "Signal design" ], "authors": [ { "name": "Bing Wu", "org": "Dept. of Radiol. & Biomed. Imaging, Univ. of California San Francisco, San Francisco, CA, USA" }, { "name": "Chunsheng Wang", "org": "Dept. of Radiol. & Biomed. Imaging, Univ. of California San Francisco, San Francisco, CA, USA" }, { "name": "Douglas A C Kelley", "org": "GE Healthcare, San Francisco, CA, USA" }, { "name": "Duan Xu", "org": "Dept. of Radiol. & Biomed. Imaging, Univ. of California San Francisco, San Francisco, CA, USA" }, { "name": "Daniel B Vigneron", "org": "Dept. of Radiol. & Biomed. Imaging, Univ. of California San Francisco, San Francisco, CA, USA" }, { "name": "Sarah J Nelson", "org": "Dept. of Radiol. & Biomed. Imaging, Univ. of California San Francisco, San Francisco, CA, USA" }, { "name": "Xiaoliang Zhang", "org": "Dept. of Radiol. & Biomed. Imaging, Univ. of California San Francisco, San Francisco, CA, USA" } ], "venue": "IEEE Transactions on Medical Imaging", "year": 2010 }, "Nu0AgGqg": { "id": "Nu0AgGqg", "title": "Use of Bi-2223 multifilamentary tapes as RF coils for 1.5T MRI application", "abstract": "High temperature superconducting tapes are potential materials for radio frequency coils in magnetic resonance imaging. They show advantages of much lower cost and easier fabrication over HTS thin film coils. Resistance of HTS tape coils in the magnetic field was evaluated and their quality factors were analyzed. A 50 mm in diameter HTS tape coil for 1.5 T high field MRI was demonstrated for phantom imaging. It obtained a 1.11-fold and a 1.36-fold SNR improvement over the same size copper coil at 77 K and 300 K respectively. Technical issues with HTS tape coils in practice were also discussed. Keywords HTS tapes Magnetic resonance imaging RF coil Signal-to-noise ratio Surface resistance Critical current density 1 Introduction Many high temperature superconducting (HTS) radio frequency (RF) coils for magnetic resonance imaging (MRI) have been reported in these years [1–7] . Although significant signal-to-noise ratios (SNRs) have been obtained with these HTS coils compared with normal metal coils, most of these coils are made of HTS thin films, such as YBCO films. In the aspect of the price-to-performance ratio, the high cost and complicated fabrication of present HTS thin films decrease their attractions and limit their large scale applications. In order to decrease the cost of the present HTS film RF coils, commercialized bismuth based HTS tapes, such as Bi-2223 and Bi-2212 tapes, are attracting researchers’ interests gradually as the potential choice for RF coils in MRI. Grasso et al. [8] measured the quality factors ( Q s) of surface coils made by Bi-2223 tapes and observed that their Q s were not much less than the YBCO films. Jing et al. [9] investigated the Q s theoretically and verified it with experiments. Both of these investigations reported that HTS tape coils have potentials to obtain higher SNR than copper coils for imaging. Cheng et al. [10] built a 5-in. tape RF receiving coil for 0.21 T MRI system, and demonstrated a 3 times SNR improvement over an equivalent room temperature copper coil, which proved the feasibility of HTS tapes for MRI. HTS tape coils show many advantages over present HTS film coils. First of all, the costs of tape coils can be much less than those of thin film coils due to the cheap material and easy fabrication. Secondly, HTS tapes can be fabricated, theoretically, to as large as possible, to improve RF penetration and increase imaging field of view (FOV). Thirdly, resonant frequencies of tape coils are easier to tune than film coils after fabrication. Furthermore, without the rigid substrate of films, HTS tapes have possibility to be implemented to not only surface coils, but also volume coils by winding, etching and molding [4,7] . On the other hand, tape coils also have their own drawbacks. They have higher resistance and lower Q s than film coils due to their not pure superconducting structures. The silver sheath of HTS tapes has to been removed [8] for imaging to avoid the complete screening of the superconducting phase from RF signal, which makes the bare tape quite brittle and hard to handle. In addition, HTS tapes cannot be used to build microcoils because their superconducting performance will degrade significantly when over-bended. However, many questions about HTS tape coils still have not been fully discussed and many technical issues have not been well addressed. Since HTS tapes are often focused towards applications in the AC frequency range far below RF, their performance, especially their surface resistance at RF, is really an issue that has not been fully investigated. Due to the structure of superconducting grains and weak link Josephson junctions between them as well as of normal metal inclusions, surface resistance of HTS tapes, will increase in the magnetic field. Although HTS tape coil has been demonstrated for low field imaging, the experiments with HTS tape coils for high field imaging have not been carried out so far. In this work, these questions are analyzed theoretically, and a 50 mm Bi-2223 tape coil for phantom imaging at 1.5 T and its SNR performance are reported. 2 Theoretical analysis 2.1 Surface resistance Surface resistance is one of the most important parameters for RF and microwave applications. It reflects the intrinsic loss of the material itself at high frequency. The surface resistance of the normal metal is a square root function of frequency resented as Eq. (1) (1) R srf = μ 0 ω ρ 2 , where μ 0 denotes the permeability of free space, ω , the angular frequency and ρ the resistivity. For superconductors, two-fluid model, as expressed in Eq. (2) [11] , is widely used as a first-order approximation of the surface resistance of superconductors. (2) R srf = 1 2 ρ n μ 0 2 ω 2 λ 3 T T c 4 , where λ = λ 0 1 - T T c 4 1 / 2 , where ρ n is the normal state resistivity, λ is the penetration depth, T is the operating temperature and T c is the critical temperature of the superconductor. Penetration depth is much dependent on the crystal grain alignment but is believed to be frequency independent [12] . It was reported that the penetration depth in YBCO thick films with T c of 92 K is approximately 3 μm at 77 K and only 0.15 μm [13] in high quality epitaxial thin films. So far, most of the work on surface resistance of HTS films concentrates on microwave frequency range above 1 GHz. At the frequency range of interests for MRI, from 10 MHz to 400 MHz (corresponding to the magnetic field strength from about 0.25 T to 10 T), the calculation by two-fluid model often causes significant discrepancy, and it is difficult to measure the surface resistance of HTS films in cavities or using planar resonator due to the large size and the very high sensitivity required to measure the low loss of films [12] . Therefore the evaluation of surface resistance has to been carried out by quality factor, Q , measurement of surface coil made of HTS films [12] and tapes [8,9] . According to reports in Refs. [1–3,6] , the Q of a thin film can be as high as tens of thousand, but a HTS tape coil often has the Q of about a few thousand [8,10] . It indicates that the resistivity of a HTS thin film may be much lower than that of a HTS tape coil. However, when compared with Q of normal metal coils of about several hundred, HTS tape coils still show about one order higher Q , which indicates HTS tape has lower resistivity than normal metals. On the other hand, Bi-2223 tapes are not pure superconductor even after sheath removal. Therefore its surface resistance may perform like a parallel combination of superconducting filaments and silver inner matrix. Fortunately, it has been observed that close to the silver sheath, the conversion to the Bi-2223 is more complete and the grains are larger and more highly aligned than the central part in the tape [14] . Consequently, the current should almost concentrate in the HTS grains at the tape edges at RF range. But at higher frequency, it is expected that HTS tapes will demonstrate square root frequency dependence of surface resistance as shown in Eq. (1) . 2.2 Resistance in the magnetic field The resistance of HTS RF coils in the static magnetic field should be quite different from the resistance outside of the field. There are two approaches to investigate the resistance of HTS coils in the magnetic field. One approach is to calculate the surface resistance based on some theoretical models. However, there is a big issue that the penetration depth is not only temperature dependent but also magnetic strength dependent. The dependence of penetration depth on the field strength is so complicated that there are still arguments on it. According to the work by Yip and Sauls [15] and by Maeda et al. respectively [16] , the increase of penetration depth is proportional to the applied magnetic field, which is in sharp contrast to the square law expression by Sridhar et al. [17] . However, the applied field in Ref. [16] did not exceed 100 Oe (corresponding to 0.01 T), much lower than the magnetic field used in MRI. Therefore, the validity of the equation in the high field has not been verified. The other approach is to use an effective resistivity to evaluate the HTS resistance in the magnetic field supposed that the resistivity is independent of the frequency. Therefore the resistance can be calculated by the well know equation as expressed in Eq. (3) : (3) R = ρ e l S , where ρ e is the effective resistivity, l is the length and S is the transport cross section. The dependence of penetration depth on the frequency is related with the variation of transport cross section S . Kusevic et al. [18] investigated the resistivity of the Bi-2223 tape with silver sheath in the magnetic field applied perpendicular to the tape surface from 0 T to 15 T . It was found that throughout the explored field range, the resistivity shows Arrhenius behavior expressed as (4) ρ ∝ exp ( - U ∗ ( 1 - T / T cs ) / k B TB 0.5 ) 1 T ⩽ B ⩽ 15 T , where T is the temperature, U * is a constant determined by the specific tape sample, k B is Boltzmann’s constant, B is the magnetic field strength and T cs = 118 K. According to the data in the field of 1.5 T, the resistivity of Bi-2223 HTS tape at 77 K should be in the order of 10 −9 Ω m, the same order as the cool copper in liquid nitrogen. Accounting for the orientation of the tape with respect to the field direction, the field perpendicular to the tape surface in Kusevic’s work [18] is an extreme situation in which case the resistivity should be the highest. In practice, the orientation of the HTS tape coil with respect to the magnetic field differs with position, which is demonstrated in Fig. 1 . For example, at point A in Fig. 1 , the magnetic field is perpendicular to the tape surface, whereas at point B, the field is parallel to the tape surface. In addition, the silver sheath removal may be helpful to reduce the resistivity of the tape coil in the imaging. Moreover, owing to the fast development of the Bi-2223 tapes, nowadays Bi-2223 tapes with much higher critical current density than the sample Kusevic et al. used [18] are available which also helps decrease the resistivity further. The resistivity of the Bi-2223 tape coil is estimated to be about 10 −10 –10 −9 Ω m. 2.3 Quality factor Quality factor is a very important parameter to estimate the resistive loss of the RF coil and other losses. It is defined as the resonant frequency times the stored field energy divided by the power loss per circle of RF, as shown in Eq. (5) [19] : (5) Q = ω stored energy P . The total losses of an HTS tape coil are quite different from those of an HTS film coil and a normal metal coil. The losses of a film coil include the intrinsic conductive loss in the superconductor itself, and the extrinsic losses from radiation and dielectric substrate. The losses of an HTS tape coil result from not only the intrinsic conductive loss of the tape, but also the conductive loss of the contact metal pads, loss of the capacitor soldered and the radiation loss. The final quality factor Q 0 can be expressed by the quality factors determined by different loss sources of HTS material ( Q H ) radiation ( Q r ), contact pad ( Q p ) and capacitor ( Q c ), as shown in Eq. (6) : (6) 1 Q 0 = 1 Q H + 1 Q r + 1 Q p + 1 Q c . In the interesting frequency of MRI, the radiation loss is usually neglected. As discussed above, superconductor loss may be one order lower than the copper loss in liquid nitrogen, so the contribution of Q H to the total loss can also be neglected. Consequently, the major factors to affect Q 0 come from Q p and Q c . Then Eq. (6) can be converted to Eq. (7) : (7) 1 Q 0 ≈ 1 Q p + 1 Q c . Compared with HTS thin films, there are lumped capacitors in the HTS tape coils, different from the pure distributed parameter structure of HTS films. Therefore, even though the RF specific capacitors with high Q c are used, the loss caused by the capacitors is much higher than the dielectric loss from the substrates of films, specially for the cases at frequency higher than 100 MHz. Referring to the data from specifications of ATC 100B series RF Capacitors [20] , Q c of the capacitor higher than 51 pF will be less than 1000 at 150 MHz. Therefore the total quality factor Q 0 of the tape coil will not exceed 1000 at this frequency. The loss from contact pads or solder joints should be another factor to decrease Q 0 of the tape coil, which has been discussed in Ref. [9] . So accounting for these two factors, Q 0 of a tape coil will not be more than one order higher than a copper coil in liquid nitrogen at high frequency. With respect to the low frequency tape coil, Grasso et al. [8] found that Q 0 could be even higher than that of a planar YBCO thick film [4] . However, the maximum Q 0 value only appeared during the specific sheath etching step and the process was difficult to control, so it would not be very meaningful in practice for general HTS tape coils. When used for imaging, another parameter of the coil should be considered is the loaded quality factor Q l , which reflects the coupling of the coil to the sample being imaged. In contrast to Q 0 , which is also called unloaded quality factor Q ul , Q l is also determined by the inductive loss from the sample besides those sources mentioned above. Q l and Q 0 often used to calculate the sample resistance ( R s ) by Eq. (8) : (8) R s = 1 ω C 1 Q l - 1 Q 0 , where ω is the angular frequency and C is the capacitance used in the coil. 3 Experiments and results A 5-in. tape RF receiving coil for 0.21 T low field MRI has been demonstrated and a 3-fold SNR improvement has been obtained over the room temperature copper coil by Cheng et al. [10] . However, SNR improvement with HTS tape coils applied to high field may have more significance because high field MRI has become the mainstream. A HTS tape surface coil was demonstrated for the first time for phantom imaging at 1.5 T, the most widely used high field clinical MRI system presently. A 50 mm diameter Bi-2223 surface coil was fabricated with the Bi-2223 tape provided by Trithor Company, Germany, whose critical current density J c0 is 70 A/mm 2 . When the tape is bended to 50 mm in diameter, J c0 will not decrease by over 5%. The fabrication of the Bi-2223 tape surface coil is just like the fabrication of normal surface coil, and has been described in Refs. [8,10] . Two copper coils with the same size resonated at the same frequency were fabricated for comparison. ATC 100B series high Q RF capacitors were used in both HTS tape coil and copper coils. Accounting for the safety issue, phantom imaging was carried out instead of in vivo imaging. A cylindrical phantom with diameter of 10cm and height of 7 cm was used to simulate human muscles, whose dielectric constant and conductivity at 100 MHz are 70.5 and 0.68 S/m respectively, quite similar with the corresponding values of 72 and 0.85 S/m of human muscles [21] . Before the imaging experiment, Q s of the coils were measured by mutual coupling method with an HP 8753C network analyzer [9] . The results of the measurement were listed in Table 1 . Note that Q s of the coils had to be measured out of the magnet because any electric devices were not allowed to operate in the scanner room. Accounting for the reason, the HTS tape coil resistance should be a little higher than the measured value in Table 1 . The setup of the imaging experiment is illustrated in Fig. 2 . The MR scanner type is GE Signa LX 1.5 T. A custom designed glass vacuum vessel was used as cryostat. The vessel has thin vacuum gap of 5 mm, which helps to increase the filling factor, and meanwhile provides good heat insulation performance to keep liquid nitrogen for 1 h. The coils were used as transmit/receive mode at liquid nitrogen temperature (77 K). Matching was implemented by mutual coupling method with a pick up coil wrapping around the vacuum vessel. A GE spin-echo sequence with TR = 120 ms, TE = 3.4 ms, and NEX = 1 was used for all the imaging experiments. Different power settings were determined for coils by stepping through a range of transmit attenuation values in the prescans. The optimum transmitted power was set with both HTS coil and copper coils in order to maximize the signal amplitude. The FOV, the slice thickness and acquisition matrix size were 15 cm × 15 cm, 5 mm and 256 × 256 respectively. The coronal phantom images obtained with these coils were taken from the plane about 1.4 cm depth away from the coils and were shown in Fig. 3 . The intensities of the images in Fig. 3 mapped by SNR were analyzed. The noise region was selected as the whole background in the images. The signal region was selected as the circular region just covering the phantom. Signal intensity along the horizontal axis extracted from images of the phantom with these three coils were plotted and shown in Fig. 4 . The results showed that the image with the HTS tape coil obtained an average SNR improvement of 1.11-fold over the image with the cool copper coil at 77 K, and 1.36-fold over the image with the copper coil at room temperature. 4 Discussion In contrast to the three times SNR improvement demonstrated with the 5-in. tape coil for 0.21 T [10] , the 1.36-fold SNR improvement with the 2-in. tape coil for 1.5 T seems not so significant. The result is quite reasonable because it is considered that the sample resistance increases with the square of resonant frequency [22] while the coil resistance is proportional to resonant frequency [23] . However, both the SNR improvement at 0.21 T and the SNR improvement at 1.5 T in this experiment are higher than the prediction according to the scaling law given by Darrasse and Ginefri [23] . The reason relies in the model they used is based on the semi-infinite conductive sample. In practice, the SNR performances should be much dependent on the sample sizes, sample electric parameters and their coupling to the coils. Therefore the SNR improvements by HTS coils might be underestimated. Comparing the histograms of the phantom images with three coils shown in Fig. 3 , the histogram of HTS tape coil showed much wider distribution than the other two. It indicated that the sensitivity of the tape coil is much more imhomogeneous. The major reason may be a small fraction of the HTS filaments were broken during bending and etching, which caused inhomogeneous current distribution in the tape cross section. Another reason for it might be that the flip-angle adjustment during the manual scan caused small slice-profile distortion. Another issue of non-linear power transmission with thin film coils [24] would not be encountered with respect to the HTS tape coil. Although the critical current density of HTS thin films is higher than that of tapes, the thickness of a thin film is often in nanometer magnitude, much smaller than the London penetration depth in micron magnitude. Therefore, the critical current density can actually be exceeded during pulse sequence excitation. However, the present HTS tapes provide high enough critical current density and much larger transmission cross section than thin films. Even the degradation of critical current density, J c , of HTS tape in the high field is taken into account, its J c is still higher than 2 A/mm 2 of copper. Therefore, when applied to RF excitation as transmit coil, J c of HTS tape will seldom saturated. To avoid non-linear transmission behavior, thin film coils are often used as receive-only mode. However, another issue of decoupling the thin film coil with the transmitter has to be addressed. Due to the intrinsic distributed structure of HTS films, decoupling circuit is difficult to be applied, which can also introduce extra losses and hence decrease SNR improvement. Meanwhile, it was reported that more noises were introduced in receive-only mode than in transmit-receive mode due to the addition of transmit volume coil [2] . Anisotropic characteristics of the type II HTS materials in the magnetic field really restricts the applications of both HTS films and tapes. In order to preserving high quality factor performance of HTS coils, correct orientation of the HTS grain with respect to the field is very important. There is still no solution to address it perfectly. For HTS tapes, the anisotropy in the magnetic field can be alleviated by decreasing the operating temperature [25] or by a novel HTS filaments arrangement of horizontal and vertical stacks [26] . So far, almost all of the HTS coil demonstrations in MRI are like once-done experiments and cannot be run routinely by inexperienced physicians. To ensure reproducible operation without complex handling constraints, HTS RF systems are highly expected to provide convenient and safe packaging of coils, friendly usage and low cost feature. At short term, it means both of HTS tape coils and thin film coils for MRI are still far from commercialization and only restricted in academic research applications. 5 Conclusion HTS tapes used as RF coils for MRI are attractive due to their much lower cost and relatively easier operation than HTS thin films. A 50mm surface coil for 1.5 T, the most widely used clinical high field MRI, was built and applied to phantom imaging for the first time. It demonstrated a 1.11-fold SNR improvement over a cool cooper coil at 77 K and a 1.36-fold SNR improvement over a copper coil at room temperature respectively. Based on the theoretical analysis and experiment results, it is predicted that HTS tape coils would show merits on SNR performance from 0.2 T with coil size of 5-in. up to about 1.5 T with coil size smaller than 2-in. Many technical issues of HTS tape coils still need to be solved before large-scale applications for routine clinical scans. Acknowledgments The authors thank Thrithor Company, Germany for Bi-2223 tape sample and Dr. Xiaoyuan Feng for the experiment in HuaShan Hospital, Shanghai, China. This project is supported by Hong Kong RGC Earmarked Research Grant HKU 7045/01E. References [1] R.D. Black T.A. Early P.B. Roemer O.M. Mueller A. Mogro-Campero L.G. Turner G.A. Johnson Science 259 1993 793 [2] J.R. Miller S.E. Hurlston Q.Y. Ma W.F. Dean D.J. Kountz J.R. MacFall L.W. Hedlund G.A. Johnson Magn. Reson. Med. 41 1999 72 [3] J. Wosik K. Nesteruk L.M. Xie M. Strikovski F. Wang J.H. Miller J.M. Bilgen P.A. Narayana Physica C 341–348 2000 2561 [4] S.J. Penn N.McN. Alford D. 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Iino T. Hanaguri N. Motohira K. Kishio T. Fukase Phys. Rev. Lett. 74 1995 1202 [17] S. Sridhar J.E. Mercerau Phys. Rev. B 34 1986 203 [18] I. Kusevic E. Babic J.R. Cooper W.G. Wang H.K. Liu S.X. Dou FIZIKA A 8 1999 319 [19] R. Ludwig P. Bretchko RF Circuit Design: Theory and Application 2000 Prentice-Hall Englewood Cliffs, NJ p. 205 [20] Available from: < http://www.atceramics.com/pdf/100b.pdf > [21] G. Hartsgrove A. Klaszewski A. Surowiec Bioelectromagnetics 8 1987 29 [22] B.H. Suits A.N. Garroway J.B. Miller J. Magn. Reson. 135 1998 373 [23] L. Darrasse J.C. Ginefri Biochimie 85 2003 915 [24] R.D. Black T.A. Early G.A. Johnson J. Magn. Reson. A 113 1995 74 [25] T. Kaneko T. Hikata M. Ueyama A. Mikumo N. Ayai S. Kobayashi N. Saga K. Hayashi K. Ohmatsu K. Sato IEEE Trans. Appl. Supercond. 9 1999 2465 [26] G. Grasso R. Flukiger Supercond. Sci. Technol. 10 1997 223", "keywords": [ "copper", "quality factor", "signal to noise ratio", "surface resistance", "magnetic field", "magnetic resonance imaging", "thin film", "rf coil", "radio frequency", "magnetic resonance image" ], "authors": [ { "name": "Jing Yuan", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Room 705, CYC Building, Pokfulam Road, Hong Kong" }, { "name": "G.X. Shen", "org": "" }, { "name": "Chunsheng Wang", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Room 705, CYC Building, Pokfulam Road, Hong Kong" }, { "name": "Bing Wu", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Room 705, CYC Building, Pokfulam Road, Hong Kong" }, { "name": "Peng Qu", "org": "Department of Electrical and Electronic Engineering, The University of Hong Kong, Room 705, CYC Building, Pokfulam Road, Hong Kong" } ], "venue": "Physica C: Superconductivity and its applications", "year": 2004 }, "ycqyBnZM": { "id": "ycqyBnZM", "title": "InterconnectingL/C components for decoupling and its application to low-field open MRI array", "abstract": "", "keywords": [], "authors": [ { "name": "Bing Wu", "org": "" }, { "name": "Peng Qu", "org": "" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "Jing Yuan", "org": "" }, { "name": "Gary X. Shen", "org": "" } ], "venue": "Concepts in Magnetic Resonance Part B-magnetic Resonance Engineering", "year": 2007 }, "ebZaz6Zw": { "id": "ebZaz6Zw", "title": "B1 field, SAR, and SNR comparisons for birdcage, TEM, and microstrip coils at 7T.", "abstract": "To compare the performance of birdcage, transverse electromagnetic (TEM) and microstrip volume coils at 7T under the same geometric conditions.Birdcage, TEM, and microstrip coils are modeled with the same dimensions. The finite difference time domain (FDTD) method is adopted to calculate the electromagnetic fields of the coils. Further, B(1) field, specific absorption rate (SAR) and signal-to-noise ratio (SNR) are calculated for these coils.In the unloaded case, within the central axial plane, the variation of B(1) field magnitude over 18-cm distance is about 15% for the birdcage coil, 23% for the TEM coil, and 38% for the microstrip coil. In the loaded case, the percentages of the samples on the central axial plane, which have B(1) field magnitude within +/-20% of the average B(1) field magnitude, are about 57% for the birdcage, 72% for the TEM, and 59% for the microstrip coil. Average SAR levels are 11.4% and 42.9% higher in the birdcage than those in the TEM and microstrip coils, respectively. The average relative SNR on the central axial plane for the shielded birdcage, TEM, and microstrip coils are 1, 1.07, and 1.48, respectively.The birdcage coil has the best unloaded B(1) field homogeneity, and the TEM coil has the best loaded B(1) field homogeneity and the lowest radiation loss; while the microstrip coil is better in SAR and SNR at 7T than the birdcage and TEM coils.", "keywords": [ "snr", "sar", "rf coil" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "Gary X Shen", "org": "" } ], "venue": "Journal of magnetic resonance imaging : JMRI", "year": 2006 }, "6m3QfLHN": { "id": "6m3QfLHN", "title": "Studies on the ticks and its transmission Lyme disease in Jilin province", "abstract": "Objective To explore the relationship between Lyme disease and tick. Methods Combining with seroepidemiology and identifying the ticks collected in Jilin province. Results The ticks collected in Jilin province were examined,2 family,5 genera,15 species were recorded. Conclusion Ixodes persulcatus was confirmed as Lyme disease vector.", "keywords": [ "seroepidemiology", "tick", "vector", "Lyme disease" ], "authors": [ { "name": "GAO Lan-ying", "org": "Center for Disease Control and Prevention of Jilin Province,Changchun ,China" }, { "name": "WANG Chun-sheng", "org": "Center for Disease Control and Prevention of Jilin Province,Changchun ,China" }, { "name": "YANG Xiu-jun", "org": "Center for Disease Control and Prevention of Jilin Province,Changchun ,China" } ], "venue": "Chinese Journal of Hygienic Insecticides & Equipments", "year": 2007 }, "5lV5XITA": { "id": "5lV5XITA", "title": "Epidemiological Survey of Lyme Disease in Plain Region of Jilin Province", "abstract": "Objective To investigate the distribution of natural foci,the infection rate of Lyme disease in human and animals in 16 counties of 5 regions of Jilin Province. Methods The pathogen was cultivated by using BSK and was examined with DFA. The specific IgG in human and animals was detected by ELISA. Results The germ-carrying rate was 31.95% (507/1,587) in ticks,the average infection rate was 4.95% in human (45/909) and 18.194%in five kinds of animals. Conclusions The natural foci of Lyme disease exists universally in plain region of Jilin Province,therefore,Lyme disease does not belong to the forestry disease.", "keywords": [ "Borrelia burgdorteri", "Plain region", "Lyme disease" ], "authors": [ { "name": "WANG Chun-sheng", "org": "Jilin Provincial Center for Disease Control and Prevention,Changchun ,Jilin" }, { "name": "WAN Kang-lin", "org": "Jilin Provincial Center for Disease Control and Prevention,Changchun ,Jilin" }, { "name": "YANG Xiu-jun", "org": "Jilin Provincial Center for Disease Control and Prevention,Changchun ,Jilin" } ], "venue": "Practical Preventive Medicine", "year": 2009 }, "cFUjw8FX": { "id": "cFUjw8FX", "title": "Distribution and clinical diagnosis of lyme disease in Changchun", "abstract": "Objective To confirm the existence of the Lyme disease foci and infection in Changchun by investigation in healthy population and ticks which are the spread source.Methods IgG,IgM were deteted by the indirect fluorescent antibody test in people which were bited by ticks.The intestinal Borrelia Spirochete were cultured from Ixodes persulcatus.Results The average infection rate was 6.67% in.240 sampels.Borrelia burgdorferi-positive rate was 42.3% in 542 Ixodes persulcatus.Conclusion The existence of the Lyme disease foci and infection were confirmed in Changchun.", "keywords": [ "Clinical symptoms", "Laboratory diagnosis", "Distribution of foci", "Lyme disease" ], "authors": [ { "name": "WANG Xiao-lei", "org": "" }, { "name": "YANG Xiu-jun", "org": "" }, { "name": "GUO Jian-hua", "org": "" }, { "name": "WANG Chun-sheng", "org": "" } ], "venue": "Chinese Journal of Health Laboratory Technology", "year": 2013 }, "Jp7gAspK": { "id": "Jp7gAspK", "title": "Geographic Distribution of Lyme Disease in Jilin Province", "abstract": "Objective To investigate the geographic distribution of Lyme disease thoroughly in 9 regions of Jilin province.Methods Registering and investigating the infectious rate of humans and animals,germ-carrying rate of vector ticks,activity regulation of ticks,according to \"epidemiological questionnaires on individual case of Lyme disease\".The distribution of natural foci and geographical landscapes of Lyme disease in Jilin Province were analyzed and the investigation data of mountain areas,half-mountain areas,plains were treated statistically.Results Of 3 561 people,the biting rate of ticks were 91.00% and infectious rate among 2 292 people was 6.20% in 9 regions of Jilin Province.In 2 499 questionnaires of horses,oxen,sheep,mice and dogs,the infectious rate was 22.13%.The germ-carrying rate of 3 570 ticks was 35.80%.Conclusion Natural foci of Lyme disease exist in 9 districts and tour spots of Jilin province.Lyme disease is not a disease of forestry type.", "keywords": [ "Investigation of natural focus", "Geographic distribution", "Lyme disease" ], "authors": [ { "name": "WANG Chun-sheng", "org": ",et al.Jilin Provincial Center for Disease Control and Prevention,Changchun Jilin ,China" }, { "name": "DU Zhan-sen", "org": ",et al.Jilin Provincial Center for Disease Control and Prevention,Changchun Jilin ,China" }, { "name": "XIA Qi-bin", "org": ",et al.Jilin Provincial Center for Disease Control and Prevention,Changchun Jilin ,China" } ], "venue": "Chinese Journal of Public Health Engineering", "year": 2007 }, "62vdwUb8": { "id": "62vdwUb8", "title": "Investigation of lyme disease in human by IFA", "abstract": "Objective:To establish a new method and understand infectious condition in human in Jilin.Methods:A total of 2719 serua were investigated in 53 counties of 27 cities in Jilin with IFA.Results:The infectious rate was 5.99(163/2719),the higher 7.08(23/325) in Yanbian,the lower 3.26(6/184) in Songyuan.Conclusion:The result in the Lyme disease detection in the crowd with IFA and the result with ELSIA is basically the same.IFA is one of examination methods the county level above medical unit is worth promoting.", "keywords": [ "IFA", "Lyme disease" ], "authors": [ { "name": "YANG Xiu-jun", "org": "Jilin Center for Disease Control and Prevention,Changchun ,China" }, { "name": "WAN Kang-lin", "org": "Infectious Disease Control and Prevention,Beijing ,China" }, { "name": "WANG Chun-sheng", "org": "Jilin Center for Disease Control and Prevention,Changchun ,China" }, { "name": "GENG Zhen", "org": "Infectious Disease Control and Prevention,Beijing ,China" }, { "name": "GUO Jian-hua", "org": "Jilin Center for Disease Control and Prevention,Changchun ,China" }, { "name": "WANG Bo", "org": "Jilin Center for Disease Control and Prevention,Changchun ,China" }, { "name": "WANG Hui", "org": "Jilin Center for Disease Control and Prevention,Changchun ,China" }, { "name": "ZHANG Guo-fang", "org": "Qianguo Center for Disease Control and Prevention,Qianguo ,China" }, { "name": "GU Yu", "org": "Jilin Frontier Defence Panto-company Hospital,Tonghua ,China" } ], "venue": "Chinese Journal of Health Laboratory Technology", "year": 2009 }, "2rHgM0bX": { "id": "2rHgM0bX", "title": "Epidemiological investigation on Lyme disease in Changbai and Tonghua county, Jilin province", "abstract": "Objective To identify the status quo of Lyme infections among the population, vector ticks and host animal rats in the forest region of Changbai and Tonghua counties, Jinlin province. Methods Serological samples were collected in the forest area in Changbai and Tonghua. Ticks and rats were captured at random sites. Indirect immunofluorescence assay (IFA) was used for serological detection and nested-PCR for etiological detection of tick and rodent samples as well as gene sequencing typing. Pathogenic isolation and culture was done using BSK culture media. Results The seroprevalence of Borrelia burgdorferi IgG was 12.04% (36/299) in human in Changbai and 9.35% (23/246) in Tonghua. The carrying rate in ticks was 27.08% and 20.41% in Changbai (39/144) and Tonghua (20/98), respectively, while the carrying rate in rodents was 10.00% in both counties (4/40, 1/10). The sequence homology analysis showed that the ticks and rats were carrying the genotype Borrelia garinii. Conclusion Lyme infection was serologically evident in human in Changbai and Tonghua’s forest areas. Etiological results showed that Ixodes persulcatus and Apodemus agrarius were the key vector and host of Lyme disease in this region.", "keywords": [ "Rat", "Tick", "Etiological detection", "Borrelia burgdorferi", "Serology" ], "authors": [ { "name": "GENG Zhen", "org": ". 1 National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing , China" }, { "name": "HOU Xue-xia", "org": ". 1 National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing , China" }, { "name": "GUO Jian-hua", "org": " Jilin Center for Disease Control and Prevention" }, { "name": "HUANG Xin", "org": " Jilin Center for Disease Control and Prevention" }, { "name": "WANG Chun-sheng", "org": " Jilin Center for Disease Control and Prevention" }, { "name": "WANG Bo", "org": " Jilin Center for Disease Control and Prevention" }, { "name": "YANG Xiu-jun", "org": " Jilin Center for Disease Control and Prevention" }, { "name": "HAO Qin", "org": ". 1 National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing , China" } ], "venue": "Chinese Journal of Vector Biology and Control", "year": 2010 }, "t9MOcaGd": { "id": "t9MOcaGd", "title": "Investigation and laboratory analysis of Lyme disease in Tonghua", "abstract": "Objective:To investigate the infection rate of Lyme disease in human and animal and to identify the geographical distribution of germ-carrying tick-tampan tick.Methods:The pathogen was cultivated by using BSK and was examined with DFA.The speclfic IgG in human and animals were detected by ELISA.Results:The average infection rate was 35.09% in tick,6.67% in human and 22.12% in five kinds of animals.Conclusion:The natural foci of Lyme disease exist in Tonghua region and Changbai Mountain,there is higher infection rate in human and animal.", "keywords": [ "The infectious rate in human and animal", "The geographical distribution", "Tick the transmission media of Lyme disease" ], "authors": [ { "name": "Xia Qi-bin", "org": "Tonghua Center for Disease Control and Prevention,Tonghua ,China" }, { "name": "Wang Chun-sheng", "org": "Jilin Center for Disease Control and Prevention,Changchun ,China" }, { "name": "Li Yue-xiang", "org": "Chaoyang Health Inpsectiion,Changchun ,China" }, { "name": "Dai Jin-ling", "org": "Shuangliao Center for Disease Control and Prevention,Shuangliao ,China" }, { "name": "Chen De-gui", "org": "Ji′an Center for Disease Control and Prevention,Ji′an ,China" }, { "name": "Ge Yan-hui", "org": "Tonghua Center for Disease Control and Prevention,Tonghua ,China" }, { "name": "Du Yue-jun", "org": "Meihekou Center for Disease Control and Prevention,Meihekou ,China" }, { "name": "Liang Guo-sheng", "org": "Liuhe Center for Disease Control and Prevention,Liuhe ,China" } ], "venue": "Chinese Journal of Health Laboratory Technology", "year": 2007 }, "VtJmvLhz": { "id": "VtJmvLhz", "title": "The application of virtual instrument technology in the angle of a ship's roll motion test system", "abstract": "The design of an automatic measurement system for analyzing and display the angle of a ship's roll motion,its an interface of automatic measurement system software designed and implement ed based on the environment of the LabWindows/CVI.In this designment virtual instrument data acquisition and angle measurement and display technology processing are combined,through the acquisition,processing,displaying,saving of data are designed in software,make the angle of a ship's roll motion measurement based on the virtual instrument implemented successfully.", "keywords": [ "control element", "processing data", "data acquisition", "virtual instrument" ], "authors": [ { "name": "WANG CHun-sheng", "org": "School of Automation,Harbin Engineering University,Harbin ,China" }, { "name": "GAO ZHen-guo", "org": "School of Automation,Harbin Engineering University,Harbin ,China" } ], "venue": "Electronic Instrumentation Customer", "year": 2007 }, "EWg2PXMK": { "id": "EWg2PXMK", "title": "Designation and development of online learning system for Java based on constructivism learning theory", "abstract": "As the diversity,universality and practicality of programming language courses,researching on the characteristics of functional requirements as well as the designing methodologies for online learning systems for these courses is great significant.In this paper,based on our work in the undertaken teaching reformation research project,we introduce design and development process of our online learning system for Java programming language.Basing on constructivism learning theory,the characteristics of the functions should be supported by the system are analyzed first.Then,the architecture and the subsystems of the system are designed.The development method of the online learning system is also introduced with emphasis on the online program automatic judging system.It will be helpful to the designation and development of online learning systems for similar courses.", "keywords": [ "online learning system", "constructivism learning theory", "Java programming language" ], "authors": [ { "name": "GAO Zhen-guo", "org": "Department of Automation Control,Harbin Engineering University,Harbin ,China" }, { "name": "LIU Yan-wen", "org": "Department of Automation Control,Harbin Engineering University,Harbin ,China" }, { "name": "ZHAO Yun-long", "org": "Department of Automation Control,Harbin Engineering University,Harbin ,China" }, { "name": "WANG Chun-sheng", "org": "Department of Automation Control,Harbin Engineering University,Harbin ,China" } ], "venue": "Laboratory Science", "year": 2011 }, "97VleOTH": { "id": "97VleOTH", "title": "Construction of Simulation Framework for Service Discovery Protocols in GloMoSim", "abstract": "Network simulation is a basic technique for researching on network technologies,including service discovery protocol for Mobile Ad-hoc NETworks(MANETs).However,no network simulator widely available nowadays provides the framework for service discovery protocol simulation.This paper demonstrats the method of constructing simulation framework for service discovery protocols using GloMoSim,including the extension of GloMoSim’s node layer model,message transmission type,as well as global simulation statistics.It is a reference for researchers to adapt GloMoSim to their special simulation requirements.", "keywords": [ "service discovery", "Mobile Ad-hoc NETworks(MANETs)", "network simulation" ], "authors": [ { "name": "GAO Zhen-guo", "org": "College of Automation,Harbin Engineering University,Harbin " }, { "name": "WANG Chun-sheng", "org": "College of Automation,Harbin Engineering University,Harbin " }, { "name": "LI Xiang", "org": "College of Computer Science and Technology,Harbin Engineering University,Harbin " }, { "name": "ZHAO Jing", "org": "College of Computer Science and Technology,Harbin Engineering University,Harbin " }, { "name": "LIU Sheng", "org": "College of Automation,Harbin Engineering University,Harbin " } ], "venue": "Computer Engineering", "year": 2008 }, "uumABhJM": { "id": "uumABhJM", "title": "Design of Hydraulic Elevator System on Dynamic Equilibrium Test-bed", "abstract": "", "keywords": [], "authors": [ { "name": "WANG Chun-sheng", "org": "" }, { "name": "GAO Zhen-guo", "org": "" } ], "venue": "Chinese Hydraulics & Pneumatics", "year": 2007 }, "TMy5z0Jx": { "id": "TMy5z0Jx", "title": "Design and Development of Experimental Teaching CAI Courseware for Hydraulic Curriculum", "abstract": "This paper figured out the special necessities of hydraulic curriculum experimental teaching courseware,and then,using our practice as an example,the process of design and development of the experimental teaching courseware was demonstrated,which is divided into four parts: structure design,software selection,courseware framework development using Authorware,and virtual hydraulic circuit design using Flash.This paper can be a helpful reference for similar applications.", "keywords": [ "hydraulic circuit", "Virtual experiment", "Flash", "experimental teaching courseware", "Authorware" ], "authors": [ { "name": "GAO Zhen-guo", "org": "School of Automation,Harbin Engineering University,Harbin ,China" }, { "name": "WANG Chun-sheng", "org": "School of Automation,Harbin Engineering University,Harbin ,China" } ], "venue": "Research and Exploration in Laboratory", "year": 2008 }, "qtnbzNzU": { "id": "qtnbzNzU", "title": "Research on Integrated Technique for Recovery of Residual Level Pillars under Dry-placed Fill", "abstract": "This paper introduces a continuous ascending drift-and-fill method with tailing fill roof.Through use of a complete set of high-efficient and safety stoping process for recovery of fracturing level pillars under non-consolidated fill,which is characterized by using fuzzy mathematical method for the selection of the preferred mining method,the numerical simulation for the optimization of stope's structural parameters,the pre-grouting for creation of access roof and by adopting a continuous limitless stoping technique,the section of side-lying access,the fast-dewatering and reinforced tailings fill,and the dynamic intelligent monitoring on stope roofs,the problem on recovery of residual pillars in old stoping areas have been efficiently solved in Hedong Gold Mine,thus increasing the recoverable reserves and improving the economic profit of the mine.", "keywords": [ "access with side-lying section", "dry-placed fill", "continuous mining", "level pillar", "creation of roof by pre-grouting" ], "authors": [ { "name": "Wang Jianguo", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd" }, { "name": "Wang Chunsheng", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd" }, { "name": "Xiao Zongfo", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd" }, { "name": "Li Chunzhi", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd" }, { "name": "Jia Qiaoyu", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd" }, { "name": "Zhou Luozhong", "org": "Changsha Giant Mining Technology Co.,Ltd" } ], "venue": "Nonferrous Metals(Mining Section)", "year": 2007 }, "CsTtQSMH": { "id": "CsTtQSMH", "title": "Safety Analysis and Accident Prevention Measures of Metal Mine Power Supply System", "abstract": "This paper introduces power supply system general situation of the metal mine, analyses the familiar dangerous factors of min power supply system, and uses FTA to carry out safety appraise to this power supply system, at last indicates prevention measures of electric accident.", "keywords": [ "FTA", "metal mine", "power suplly system" ], "authors": [ { "name": "WANG Chunsheng", "org": " Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd.,Zhaoyuan ,Shandong,China" }, { "name": "WANG Jianguo", "org": " Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd.,Zhaoyuan ,Shandong,China" } ], "venue": "Nonferrous Metals(Mining Section)", "year": 2008 }, "PuBrxEpX": { "id": "PuBrxEpX", "title": "THE PRACTICE OF REFORMING CRUSHING PROCESS ON GOLD MILLING", "abstract": "Hedong Gold Mine aging equipment of existing crushing system has resulted in low production efficiency and high cost,which couldn't meet the demand of present production.Following the principle of \"crushing more and grinding little\" as well as cutting the production cost,taking into account the real situation of the mining and milling practice,the mine carried out a comprehensive reformation on the old crushing system.We adopted jaw crusher and cone crusher of Nordberg from Metso Minerals respectively in coarse crushing and fine crushing,which decreased the grain size from-16mm to-12mm,shortened the run-time from 16～20h/d to 9～10h/d,reduced the staff working on crushing process from 42 to 21,descended the crushing cost from 5.7 RMB/t to 4.7 RMB /t and the comprehensive milling cost from 33 RMB/t to 31 RMB/t.Through reformation,the annual benefit could reach nearly 10,000,000 RMB,which brought about excellent economic returns to the mine.", "keywords": [ "gold milling", "process reforming", "nordberg crusher", "crushing" ], "authors": [ { "name": "Wang Chunsheng", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd,Zhaoyuan Shandong ,China" }, { "name": "Jia Runxi", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd,Zhaoyuan Shandong ,China" }, { "name": "Feng Jinhai", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd,Zhaoyuan Shandong ,China" }, { "name": "Wang Jianguo", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd,Zhaoyuan Shandong ,China" }, { "name": "Wang Songshan", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd,Zhaoyuan Shandong ,China" } ], "venue": "Nonferrous Metals(Mineral Processing Section)", "year": 2007 }, "rBdNj7lv": { "id": "rBdNj7lv", "title": "Experiment on the Impact of District Blasting Vibration of Metal Mine to Resident Construction", "abstract": "If the blasting process of mine couldn't be treated properly,it would influence ground constructions of residents nearby.On the basis of two experiments of metal mine stope blasting,through actual investigation and theoretical account,the effect of experiment district blasting vibration procreant on constructions in the distance range of blasting center 500 m is analyzed in this paper,and experiment conclusion is obtained.", "keywords": [ "experimentation research", "blasting", "resident construction" ], "authors": [ { "name": "WANG Chunsheng", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd.,Zhaoyuan ,Shandong,China" }, { "name": "WANG Jianguo", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd.,Zhaoyuan ,Shandong,China" } ], "venue": "Nonferrous Metals(Mining Section)", "year": 2008 }, "E0XNJpEx": { "id": "E0XNJpEx", "title": "Numerical Simulation and Parameter Optimization of the Stability for the Crown Pillar-drawing Stope", "abstract": "In this paper,according to the stope layout characteristic,the upward slicing and cutting is exploited in the thick horizontal crown pillar,we build a mechanical mathematical model for the ceiling of cuts stoping working face using rock fracture process analysis(RFPA)method,and calculate the influence of the layout of cuts along the striking trend and vertical trend to the stability of ceiling respectively,thus we obtain the minimum thickness of the ceiling corresponding to the different spans of cuts.The result of this method is utilized as a better theoretical basis for the layout of the stoping cuts,the control of the span and the length of cuts,as well as the determination of the safe thickness of top-safeguarding layer.It has a guiding significance to the stoping of crown pillar.", "keywords": [ "RFPA method", "crown pillar", "cuts stoping", "top-safeguarding layer", "cuts span" ], "authors": [ { "name": "WANG Chunsheng", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd.,Zhaoyuan ,Shandong,China" }, { "name": "WANG Jianguo", "org": "Hedong Gold Mine of Zhaojin Mining Industry Co.,Ltd.,Zhaoyuan ,Shandong,China" } ], "venue": "Nonferrous Metals(Mining Section)", "year": 2008 }, "ydQdiH2v": { "id": "ydQdiH2v", "title": "Thermal decomposition analysis of coal-waste sludge and coal-sunflower seed husk blends", "abstract": "The thermal decomposition analysis of coal-pharmaceutical waste sludge,coal-sewage waste sludge blends and coal-sunflower seed husk blends are studied by TG dynamic runs at the heating rate of 20 ℃/min within the temperature range of 25 ℃-900 ℃.The effect of different kinetic models on the determination of kinetic parameters of thermal decomposition has been investigated.Results show that for coal-pharmaceutical sludge blend,coal-sewage sludge blend and coal-sunflower seed husk blend the optimal model functions are the three-dimensional diffusion reaction,2-dimensional and 3-diemensional nucleation and growth reactions,respectively.The Arrhenius kinetic parameters of the pre-exponential factor and activation energy of blends,as well waste sludge and sunflower seed husk only are proposed.", "keywords": [ "model function", "thermogravimetric analysis", "pyrolysis", "coal-waste sludge blends", "kinetic parameters" ], "authors": [ { "name": "WANG Shu-yan", "org": "School of Petroleum Engineering,Northeast Petroleum University,Daqing ,China" }, { "name": "LI Xiao-qi", "org": "School of Petroleum Engineering,Northeast Petroleum University,Daqing ,China" }, { "name": "SONG Cheng-yi", "org": "Daqing Oil Field Design Institute,Daqing ,China" }, { "name": "WANG Chun-sheng", "org": "School of Petroleum Engineering,Northeast Petroleum University,Daqing ,China" }, { "name": "DONG Qun", "org": "School of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing ,China" } ], "venue": "哈尔滨工业大学学报(英文版)", "year": 2010 }, "KLavqcyW": { "id": "KLavqcyW", "title": "Calculation of Thermal Analysis between Gas Gathering Station and First Stop Outside the Transmission through Furnace", "abstract": "Optimization of the heating furnace's temperature is one of the important ways to save energy and decrease loss from the gas gathering station that through heating furnace to the first outside transmission station.Thermal analysis model was established through the application of heat transfer,thermodynamics,computational fluid dynamics and related theories,considering the pipeline throttling,gas convective heat transfer in the tube,the heat transfer among natural gas,wall,insulation,soil,and atmosphere.The temperature drop was calculated between heating furnace and the first outside transmission station.Some factors' effect on the optimization of the heating furnace's temperature was analyzed,such as caliber,gas volume and surface temperature.The most suitable heating furnace's temperature should be optimized,based on the expected natural gas temperature of the first outside transmission station.", "keywords": [ "thermal analysis", "save energy", "natural gas", "heating furnace" ], "authors": [ { "name": "FENG Cui-ju", "org": "Earth Sciences Institute,Northeast Petroleum University,Daqing ,China" }, { "name": "WANG Chun-sheng", "org": "Earth Sciences Institute,Northeast Petroleum University,Daqing ,China" }, { "name": "GAO De-jie", "org": "Earth Sciences Institute,Northeast Petroleum University,Daqing ,China" } ], "venue": "Oil Field Equipment", "year": 2011 }, "OLNDsFYd": { "id": "OLNDsFYd", "title": "Influence of Rod Flexibility Near Pump on Eccentric Wear of Screw Pump Well", "abstract": "The finite element method was used to establish transient dynamic model of the screw pump rod.The model simulates the actual movement of rod when the screw pump was produced,considering the sucker rod string have impacts on the transverse motion.According to the research that how the length and the elastic modulus of bendable rod which was near the pump,influencing the transverse displacement of rods.The results showed that increasing the elastic modulus of sucker rod which was close to pump is useful for reducing the vibration of poles.That is,reducing the eccentric wear.This model is applied not only to vertical wells,but also to inclined well.", "keywords": [ "near to the pump", "screw pump well", "prevention of eccentric wear", "flexibility" ], "authors": [ { "name": "WANG Chun-sheng", "org": "College of Petroleum Engineering" }, { "name": "JU Guo-shuai", "org": "College of Adult Education,Northeast Petroleum University,Daqing ,China" } ], "venue": "Oil Field Equipment", "year": 2011 }, "W1vxEYKF": { "id": "W1vxEYKF", "title": "Pressure Drop Calculation of Sea Water Pipe with Non-insulated Oil and Gas Transferring", "abstract": "This submarine pipeline was used to transport water originally,however,it is an oil-gas mixed transportation pipeline without heat preservation now.Because of differences between physical properties of oil-gas and water,we should take the gas and liquid viscosity,density and interfacial tension and other factors into account to establish a new submarine pipeline pressure drop model.In this paper,according to the field logo provided by the 20B platform,20A platform,251B platform,CB502 platform of submarine pipeline,we apply the methods of comparative analysis and mathematical simulation to establish Beggs-Brill submarine pipeline pressure drop model and the temporary oil-free thermal insulation of the pressure drop and mathematical model,we also make the analysis of a variety of factors impacting on the pipeline pressure drop,including the starting temperature of media,gas liquid flow rates,pipe diameter,angle of inclination,Provide a reference basis to design submarine pipeline.", "keywords": [ "mixed transportation", "Beggs-Brill pressure drop model", "pressure drop", "submarine pipeline" ], "authors": [ { "name": "YANG Shu-ren", "org": "Petroleum Engineering College,Northeast Petroleum Institute,Daqing ,China" }, { "name": "SUN Yong", "org": "Petroleum Engineering College,Northeast Petroleum Institute,Daqing ,China" }, { "name": "SUN Qi-ji", "org": "Petroleum Engineering College,Northeast Petroleum Institute,Daqing ,China;StorageTransportation and Sales Sub-company,PetroChina Daqing Oilfield Co.,Ltd.,Daqing ,China" }, { "name": "WANG Chun-sheng", "org": "Petroleum Engineering College,Northeast Petroleum Institute,Daqing ,China" }, { "name": "GAO De-jie", "org": "Petroleum Engineering College,Northeast Petroleum Institute,Daqing ,China" } ], "venue": "Oil Field Equipment", "year": 2011 }, "io7oGdKJ": { "id": "io7oGdKJ", "title": "Temperature Drop Calculation for Natural Gas Transmission Pipeline", "abstract": "The numerical computation of natural gas pipeline temperature drop will provide the reference data for design of gas pipeline,the judgment of hydrate formation,the normal production and operation.On the basis of SuHuoFu formula,considering the effect of the Joule-Thomson,according to the natural gas flowing through a pipe heat conduction basic theory,combined with engineering thermodynamics,heat transfer and fluid mechanics knowledge,establishing gas transmission pipeline temperature drop model,adopt iterative method,the natural gas temperature along the pipe is calculated,comparing some kind of factors such as gas composition,the pipeline operational factor,the heat preservation situation,and analysis how the factors influent the temperature drop,providing the theory basis for how to reduce the temperature drop in the gas line,the heating power and the heating furnace heating temperature calculation,and energy conservation and optimization.", "keywords": [ "calculation", "natural gas", "gas line", "temperature" ], "authors": [ { "name": "GAO De-jie", "org": "College of Petroleum Engineering,Northeast Petroleum University,Daqing ,China" }, { "name": "WANG Xin", "org": "Construction Company,Offshore Oil Engineering Co.,Ltd.,Tianjin ,China" }, { "name": "WANG Chun-sheng", "org": "College of Petroleum Engineering,Northeast Petroleum University,Daqing ,China" }, { "name": "SUN Qi-ji", "org": "College of Petroleum Engineering,Northeast Petroleum University,Daqing ,China;Storage and Transport and Marketing Sub-company,Daqing Oilfield Company,Daqing ,China" }, { "name": "SUN Yong", "org": "College of Petroleum Engineering,Northeast Petroleum University,Daqing ,China" }, { "name": "XU Guo-fu", "org": "Gas Production Sub-company,Daqing Oilfield Company,Daqing ,China" } ], "venue": "Oil Field Equipment", "year": 2011 }, "y66unsjX": { "id": "y66unsjX", "title": "Hydrogen storage properties of Ml 1−x Ca x Ni 5 pseudobinary intermetallic compounds", "abstract": "", "keywords": [ "hydrogen storage", "intermetallic compound" ], "authors": [ { "name": "xinhua wang", "org": "" }, { "name": "changpin chen", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "qidong wang", "org": "" } ], "venue": "Journal of Alloys and Compounds", "year": 1996 }, "gliEmRkJ": { "id": "gliEmRkJ", "title": "Structure of the secondary phase and its effects on hydrogen-storage properties in a Ti 0.7 Zr 0.2 V 0.1 Ni alloy", "abstract": "", "keywords": [ "hydrogen storage" ], "authors": [ { "name": "q a zhang", "org": "" }, { "name": "y q lei", "org": "" }, { "name": "c s wang", "org": "" }, { "name": "f s wang", "org": "" }, { "name": "q d wang", "org": "" } ], "venue": "Journal of Power Sources", "year": 1998 }, "8si6E288": { "id": "8si6E288", "title": "Effect of Co content on the kinetic properties of the MlNi4.3-XCoXAl0.7 hydride electrodes", "abstract": "By means of linear polarization, Tafel polarization and galvanostatic discharge methods, the kinetic properties of MlNi 4.3− X Co X Al 0.7 ( X =0.0, 0.3, 0.5, 0.7, 0.9, 1.1 and 1.3) hydride electrodes, including high rate dischargeability HRD, exchange current density I 0 , limiting current density I L , the symmetry factor β , and the apparent diffusion coefficient of hydrogen in the α phase D α have been studied systematically. The results show that the HRD of the electrode with high Co content is lower than that with low Co content. For the MlNi 4.3− X Co X Al 0.7 hydride electrodes, with Co content increasing from 0.0 to 1.3, the values of I 0 , I L , β and D α decreased from 395 to 33 mA/g, 2263 to 308 mA/g, 0.85 to 0.43, 1.42×10 −10 to 2.1×10 −11 cm 2 /s, respectively. In order to calculate the electrochemical polarization η e and concentration polarization η c based on anodic polarization curve, the experimental anodic polarization curve should be divided into three regions to discuss according to discharge current density I d , namely, I d < I P , I P < I d < I f , and I d > I f . The calculation of η e and η c should use different formula in different regions. When discharge current density I d is smaller than I p , the traditional equation used to calculate the electrochemical overpotential can not be used, when I p is between I p and I f , both equations used to calculate the electrochemical overpotential and concentration overpotential can be used, and when I d is larger than I f , because there exists absorption and adsorption of hydrogen, the traditional equation used to calculate concentration overpotential can not be used in the system of hydride electrodes.", "keywords": [ "null" ], "authors": [ { "name": "Hongge Pan", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Jianxin Ma", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Chunsheng Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Changpin Chen", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Qidong Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" } ], "venue": "Electrochimica Acta", "year": 1999 }, "MQhlpN3o": { "id": "MQhlpN3o", "title": "A mathematical model for the cycle life of hydride electrodes", "abstract": "In this paper, a mathematical model for the cycling electrochemical capacity of hydride electrodes was deduced on the basis of activation and degradation of hydride materials. A cycle life model was deduced on introducing the activation and degradation factors into the electrochemical polarization equation which included concentration polarization, phase transformation polarization and electrochemical polarization. Experimental data on the TiNi hydride electrode were in good agreement with the deduced model. From this model, various factors affecting the cycle life were identified and the methods to enhance the cycle life were suggested.", "keywords": [ "discharge capacity", "hydride electrode", "cycle life", "tini alloy", "mathematical model", "concentration polarization" ], "authors": [ { "name": "Y.Q. Lei", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "C.S. Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "X.G. Yang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "H.G. Pan", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "J. Wu", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "Q.D. Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" } ], "venue": "Journal of Alloys and Compounds", "year": 1995 }, "YlfEj6Nj": { "id": "YlfEj6Nj", "title": "Studies on the electrochemical properties of MlNi 4.3−x Co x Al 0.7 hydride alloy electrodes", "abstract": "", "keywords": [ "hydrogen storage", "diffusion coefficient", "electrochemical impedance spectroscopy", "current density" ], "authors": [ { "name": "hongge pan", "org": "" }, { "name": "jianxin ma", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "shaoan chen", "org": "" }, { "name": "xinghua wang", "org": "" }, { "name": "changpin chen", "org": "" }, { "name": "qidong wang", "org": "" } ], "venue": "Journal of Alloys and Compounds", "year": 1999 }, "paGRAICi": { "id": "paGRAICi", "title": "Influence of amorphization on electrode performances of AB 2 type hydrogen storage alloys", "abstract": "", "keywords": [ "hydrogen storage" ], "authors": [ { "name": "xiaoguang yang", "org": "zhejiang university" }, { "name": "yongquan lei", "org": "zhejiang university" }, { "name": "chunsheng wang", "org": "zhejiang university" }, { "name": "guangming zhu", "org": "zhejiang university" }, { "name": "wenkui zhang", "org": "zhejiang university" }, { "name": "qidong wang", "org": "zhejiang university" } ], "venue": "Journal of Alloys and Compounds", "year": 1998 }, "Ck2JmAYO": { "id": "Ck2JmAYO", "title": "Hydrogen storage properties of Ml1-xCaxNi5 pseudobinary intermetallic compounds", "abstract": "The hydrogen storage properties of the pseudobinary intermetallic compounds Ml 1− x Ca x Ni 5 (where Ml is La-rich mischmetal and x varies from 0 to 0.9) were investigated over the temperature range of 25–80°C, It was found in experiment that with increasing x in Ml 1− x Ca x Ni 5 the incubation time for its first hydrogenation shortened, the first hydrogen absorption rate accelerated, the hysteresis lowered, and the dissociation pressure of the hydrides (25°C) increased when x < 0.3 but decreased in the range of x = 0.3 to 0.9. Considering the effect of the geometrical and electric factors, we deduced an equation for the dissociation pressure as a function of Ca content x . The equation agrees well with the test results. Owing to the lower cost and favourable properties of Ml 0.8 Ca 0.2 Ni 5 , a metal hydride container of 30 N m 3 hydrogen capacity was designed and built to supply hydrogen for the hydrogen-gasoline hybrid fuel for an automobile engine.", "keywords": [ "Hydride", "Hydrogen storage alloy", "Hydrogen storage properties", "Intermetallic compound" ], "authors": [ { "name": "Xinhua Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Changpin Chen", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Chunsheng Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Qidong Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" } ], "venue": "Journal of Alloys and Compounds", "year": 1996 }, "c5iqtbAU": { "id": "c5iqtbAU", "title": "Effect of alloys modified by an alkaline solution containing potassium borohydride on the kinetic properties of MlNi3.7Co0.6Mn0.4Al0.3 hydride electrode", "abstract": "This paper describes the effects of treating the alloy powder of an electrode with 6 M KOH solution containing y M KBH 4 ( y =0.0, 0.005, 0.01, 0.02 and 0.03) on the kinetic properties of the electrode, including high rate dischargeablilty HRD, exchange current density I 0 , symmetry factor β , limiting current density I L , diffusion coefficient of hydrogen in the α-phase D α , and electrochemical polarization η e and concentration polarization η c . The results show that the kinetic parameters HRD, I 0 , I L and D α increase markedly with the increase in the concentration of KBH 4 , the η e and η c decrease rapidly with increasing concentration of KBH 4 , but the symmetry factor β does not change.", "keywords": [ "null" ], "authors": [ { "name": "Hongge Pan", "org": "" }, { "name": "Yun Chen", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "Chunsheng Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "J.X. Ma", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "C.P. Chen", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" }, { "name": "Q.D. Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China" } ], "venue": "Electrochimica Acta", "year": 1999 }, "OwOYg3kB": { "id": "OwOYg3kB", "title": "Donor Graft MicroRNAs: A Newly Identified Player in the Development of New-onset Diabetes After Liver Transplantation.", "abstract": "New-onset diabetes after liver transplantation (NODALT) is a frequent complication with an unfavorable outcome. We previously demonstrated a crucial link between donor graft genetics and the risk of NODALT. We selected 15 matched pairs of NODALT and non-NODALT liver recipients using propensity score matching analysis. The donor liver tissues were tested for the expression of 10 microRNAs (miRNAs) regulating human hepatic glucose homeostasis. The biological functions of potential target genes were predicted using gene ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis. Both miR-103 and miR-181a were significantly highly expressed in the NODALT group as compared to the non-NODALT group. The predicted target genes (e.g. Irs2, Pik3r1, Akt2, and Gsk3b) were involved in glucose import and the insulin signaling pathway. We also observed dysregulation of miRNAs (e.g. let-7, miR-26b, miR-145, and miR-183) in cultured human hepatocytes treated with tacrolimus or high glucose, the two independent risk factors of NODALT identified in this cohort. The hepatic miRNA profiles altered by tacrolimus or hyperglycemia were associated with insulin resistance and glucose homeostatic imbalance as revealed by enrichment analysis. The disease susceptibility miRNA expressive pattern could be imported directly from the donor and consolidated by the transplant factors. Donor graft microRNAs, initially controlling hepatic glucose homeostasis, could be affected by transplant factors such as early hyperglycemia and immunosuppressive drugs, and could subsequently contribute to the development of new-onset diabetes in liver transplant recipients.", "keywords": [ "translational research", "science", "liver transplantation", "hepatology", "diabetes: new onset", "posttransplant", "donors and donation: donor evaluation", "immunosuppressant", "calcineurin inhibitor: tacrolimus", "microarray", "gene array", "liver allograft function", "dysfunction" ], "authors": [ { "name": "Q Ling", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" }, { "name": "H Xie", "org": "Minist Publ Hlth, Key Lab Combined Multiorgan Transplantat, Hangzhou, Zhejiang, Peoples R China" }, { "name": "J Li", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" }, { "name": "J Liu", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" }, { "name": "J Cao", "org": "Minist Publ Hlth, Key Lab Combined Multiorgan Transplantat, Hangzhou, Zhejiang, Peoples R China" }, { "name": "F Yang", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" }, { "name": "C Wang", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" }, { "name": "Q Hu", "org": "Minist Publ Hlth, Key Lab Combined Multiorgan Transplantat, Hangzhou, Zhejiang, Peoples R China" }, { "name": "X Xu", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" }, { "name": "S Zheng", "org": "Zhejiang Univ, Collaborat Innovat Ctr Diag & Treatment Infect Di, Affiliated Hosp 1, Dept Surg,Coll Med, Hangzhou, Zhejiang, Peoples R China" } ], "venue": "AMERICAN JOURNAL OF TRANSPLANTATION", "year": 2017 }, "G6Ozp8rj": { "id": "G6Ozp8rj", "title": "Influence of concentration of KOH solution containing 0.02 M borohydride on the kinetic properties of hydrogen storage alloys", "abstract": "In this paper the effect of concentration of KOH solution containing 0.02 M borohydride on the electrochemical properties of Ml(NiCoAl) 5 hydrogen storage alloys, including the high rate dischargeability, exchange current density I 0 , limiting current density I L , and diffusion of hydrogen in the hydride, by means of linear polarization, anodic polarization, cathodic polarization, and electrochemical impedance spectroscopy, was studied in detail. The results show that high rate dischargeability, the exchange current density i 0 , and limiting current density I L increase, and the anodic and cathodic polarization decrease with the increase in concentration of KOH. The size of a semicircle of electrochemical impedance spectroscopy decreased with increase in concentration of KOH, which indicates that the diffusion coefficient of hydrogen increases. Within the range of the experimentation, it can be concluded that the higher the concentration of KOH, the better the electrochemical properties of Ml(NiCoAl) 5 hydrogen storage alloys.", "keywords": [ "concentration of alkaline", "hydrogen storage alloy electrodes", "pretreatment", "electrochemical properties", "current density", "electrode", "diffusion coefficient", "electrodes", "electrochemical impedance spectroscopy", "hydrogen storage", "kinetics", "electrolyte" ], "authors": [ { "name": "Hongge Pan", "org": "" }, { "name": "Yun Chen", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China" }, { "name": "Chunsheng Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China" }, { "name": "Xinhua Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China" }, { "name": "Changpin Chen", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China" }, { "name": "Qidong Wang", "org": "Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China" } ], "venue": "Journal of Alloys and Compounds", "year": 1999 }, "W1LNqvY9": { "id": "W1LNqvY9", "title": "Studies on the electrochemical properties of MlNi4.3-xCoxAl0.7 hydride alloy electrodes", "abstract": "In this paper, the electrochemical properties of MlNi 4.3− x Co x Al 0.7 electrode alloys, including high rate dischargeability, exchange current density I 0 , limiting current density I L , and diffusion coefficient of hydrogen in the hydride D α by means of linear polarization, anodic polarization, and electrochemical impedance spectroscopy were systematically studied. The results indicate that, with the increase of Co content, the cyclic stability is improved markedly, which agrees with previous investigation. However, activation becomes more difficult, and the high rate dischargeability decreases. The linear polarization and anodic polarization results suggest that the exchange current density I 0 and limiting current density I L decrease from the 395 ( x =0) to 33 mA g −1 ( x =1.3) and from 2263 ( x =0) to 308 mA g −1 , respectively. The electrochemical impedance spectroscopy result also reveals that the diffusion coefficient of hydrogen in the alloys decreases rapidly with the increase in Co content in MlNi 4.3− x Co x Al 0.7 hydride alloy electrodes.", "keywords": [ "null" ], "authors": [ { "name": "Hongge Pan", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Jianxin Ma", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Chunsheng Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Shaoan Chen", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Xinghua Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Changpin Chen", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" }, { "name": "Qidong Wang", "org": "Zhejiang University(Zhejiang University),Hangzhou,China" } ], "venue": "Journal of Alloys and Compounds", "year": 1999 }, "JDDx5jLz": { "id": "JDDx5jLz", "title": "Effect of Co content on the kinetic properties of the MlNi 4.3−X Co X Al 0.7 hydride electrodes", "abstract": "", "keywords": [ "current density", "kinetics", "concentration polarization", "apparent diffusion coefficient" ], "authors": [ { "name": "hongge pan", "org": "" }, { "name": "jianxin ma", "org": "" }, { "name": "chunsheng wang", "org": "" }, { "name": "c p chen", "org": "" }, { "name": "q d wang", "org": "" } ], "venue": "Electrochimica Acta", "year": 1999 }, "sQsVl7OS": { "id": "sQsVl7OS", "title": "Anomalous deformation mode transition in amorphous Mg-Zn-Ca thin films", "abstract": "Deformation mode transition (DMT) from highly-localized to non-localized in amorphous alloy thin films (AATFs) was expected to depend on the homologous temperature. Here, DMT in Mg-Zn-Ca AATF with high homologous temperature but intrinsic brittleness was monitored during film/substrate co-bending, and its critical size for DMT is much low compared to other compositions. Intrinsically brittle nature of Mg-based AATF that facilitates the shear band to unstable crack transition may be responsible for unexpected low critical size despite of high homologous temperature. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.", "keywords": [ "Amorphous alloy thin films", "Deformation mode transition", "Homologous temperature", "Brittleness" ], "authors": [ { "name": "Y. Fu", "org": "Zhejiang Univ, Sch Mat Sci & Engn, ICNSM, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "Q.P. Cao", "org": "Zhejiang Univ, Sch Mat Sci & Engn, ICNSM, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "S.Y. Liu", "org": "Zhejiang Univ, Sch Mat Sci & Engn, ICNSM, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "C. Wang", "org": "Zhejiang Univ, Sch Mat Sci & Engn, ICNSM, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "X.D. Wang", "org": "Zhejiang Univ, Sch Mat Sci & Engn, ICNSM, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "D.X. Zhang", "org": "Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "Shaoxing Qu", "org": "Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Zhejiang, Peoples R China" }, { "name": "H.-J. Fecht", "org": "Univ Ulm, Inst Micro & Nanomat, Albert Einstein Allee 47, D-89081 Ulm, Germany" }, { "name": "J.Z. Jiang", "org": "Zhejiang Univ, Sch Mat Sci & Engn, ICNSM, Hangzhou 310027, Zhejiang, Peoples R China" } ], "venue": "SCRIPTA MATERIALIA", "year": 2018 }, "UnZcOhhz": { "id": "UnZcOhhz", "title": "Comparison of the Electrochemical Impedance Spectroscopy Characteristics of Insertion Electrode Materials Used in Secondary Metal Hydride and Lithium-Ion Electrodes", "abstract": "", "keywords": [ "electrochemical impedance spectroscopy" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "A. John Appleby", "org": "" }, { "name": "Frank E. Little", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2001 }, "iF0iyQAt": { "id": "iF0iyQAt", "title": "Electrochemical impedance study of initial lithium ion intercalation into graphite powders", "abstract": "A Johnson Matthey 287 (JM 287) graphite powder disks sandwiched between two nickel screens was used as working electrodes in 1.0 M lithium hexafluorophosphate in mixed carbonate ester electrolyte. Their intrinsic impedance and lithium intercalation kinetics were determined using several different electrochemical impedance spectroscopy (EIS) protocols. The thermal stability of the electrolyte was similarly studied using a floating palladium wire working electrode. Studies at 25°C and 65°C show that a first high frequency depressed semicircle, a second depressed semicircle, and a sloping line in the low frequency range are respectively related to the initial formation of a solid electrolyte interface (SEI) film, the charge-transfer reaction, and lithium diffusion in graphite. The intrinsic resistance is in series with the reaction impedance and effectively increases the latter. The charge-transfer semicircle at the open-circuit potential moves to the low frequency range, whereas the semicircle associated with the freshly formed SEI film moves to high frequency range as lithium insertion proceeds. The passivating SEI film formed at 25°C slows down co-insertion of the electrolyte into graphite when the electrode is cycled at 65°C, which increases the cycle life of graphite at elevated temperature.", "keywords": [ "cycle stability", "intrinsic resistance", "solid electrolyte interface", "electrochemical reaction kinetics", "electrochemical impedance spectroscopy", "open circuit potential", "nickel", "thermal stability", "high frequency", "low frequency", "kinetics", "charge transfer", "reaction kinetics" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "A.John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "Frank E. Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3118, USA" } ], "venue": "Electrochimica Acta", "year": 2001 }, "0rZudyW7": { "id": "0rZudyW7", "title": "Solvent-Free Composite PEO-Ceramic Fiber/Mat Electrolytes for Lithium Secondary Cells", "abstract": "", "keywords": [], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "Xiang-Wu Zhang", "org": "" }, { "name": "A. John Appleby", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2005 }, "BaQtpn8c": { "id": "BaQtpn8c", "title": "Charge–discharge stability of graphite anodes for lithium-ion batteries", "abstract": "A graphite powder disk sandwiched between two nickel screens was used as a lithium-insertion working electrode. Electrochemical impedance spectroscopy (EIS), galvanostatic intermittent titration (GIT) using pulsed microcurrent, and in-situ intrinsic resistance measurements were used for the evaluation of kinetics and intrinsic (i.e. physical) resistance changes during charge–discharge cycling from room temperature to elevated temperatures. The investigation of the thermal stability of the electrolyte at elevated temperature used an EIS study of a palladium electrode in the electrolyte. EIS measurements for electrochemical reaction and intrinsic resistances of a graphite electrode show that the first high-frequency depressed semicircle is due to the ‘solid electrolyte interphase’ (SEI) film, although it is also influenced by the electrode contact impedance. The growth of the SEI film on the MCMB 10-28 graphite electrode surface with cycling, results in a decline in kinetic rate and a corresponding increase in contact resistance giving rapid capacity fade. The high stability of the capacity of JM 287 electrodes is due to the slow increase in SEI film thickness on their surfaces. Although new SEI films were formed on the originals at elevated temperature, the kinetics were still more rapid than at room temperature in the initial cycling.", "keywords": [ "intrinsic resistance", "electrochemical reaction kinetics", "thermal stability", "electrochemical impedance spectroscopy", "high frequency", "contact resistance", "nickel", "reaction kinetics", "room temperature", "kinetics" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "A.John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, Texas 77843-3402, USA" }, { "name": "Frank E Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A&M University, College Station, Texas 77843-3118, USA" } ], "venue": "Journal of Electroanalytical Chemistry", "year": 2001 }, "IaRrpQPd": { "id": "IaRrpQPd", "title": "In situ investigation of electrochemical lithium intercalation into graphite powder", "abstract": "The reaction kinetics for the electrochemical insertion–extraction of lithium into and out of graphite and the electrode intrinsic resistance have been studied using galvanostatic intermittent titration with applied microcurrent pulses (GIT), electrochemical impedance spectroscopy (EIS) and in situ intrinsic (i.e. physical) resistance measurements. The formation of a so-called solid electrolyte interphase (SEI) or ‘passivation layer’ on the graphite surface at about +0.8 V versus Li + /Li increases the total intrinsic resistance within the electrode on the first cycle. The gradual growth (i.e. change in volume) of the SEI film during repeated lithium insertion–extraction results in a continued increase in intrinsic resistance. The good agreement between EIS and in situ intrinsic resistance measurements indicates that the latter is a simple and powerful method for investigating the change in this parameter for graphite electrodes. GIT showed a gradual increase in kinetic rate in an initial single-phase region, followed by a decrease in a two-phase transformation region, which was in turn followed by an increase in kinetic rate in a second single-phase region. This is explained by a shrinking unreacted core model. The controlling step of lithium insertion–extraction during the two-phase transformation region was investigated by EIS and GIT.", "keywords": [ "intrinsic resistance", "electrochemical reaction kinetics", "electrochemical impedance spectroscopy", "power method", "kinetics", "reaction kinetics" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "Imran Kakwan", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3118, USA" }, { "name": "A.John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3118, USA" }, { "name": "Frank E Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3118, USA" } ], "venue": "Journal of Electroanalytical Chemistry", "year": 2000 }, "hxfj9ggP": { "id": "hxfj9ggP", "title": "Electrochemical study on nano-Sn, Li4.4Sn and AlSi0.1 powders used as secondary lithium battery anodes", "abstract": "It is believed that particle cracking resulting from phase transformation is responsible for the poor cycle performance of lithium alloy anodes. Pulverization effects may be reduced by using, (i) smaller active particles; (ii) active particle composites with different potentials for the onset of lithium alloy formation; and (iii) expanded alloys which have undergone a major increase during initial charging. Three alloys of the above types (nano-Sn, AlSi 0.1 and Li 4.4 Sn) were studied by electrochemical impedance spectroscopy (EIS) to determine their electrochemical kinetics and intrinsic resistance during initial lithium insertion-extraction. The electrodes were prepared by sandwiching a disk of active powder between two nickel screens, so that the contact resistance may be determined by EIS and from a d.c. voltage difference across the electrode (trans-electrode voltage). A large increase in contact resistance was found during lithium discharge (extraction) from nano-Li x Sn and Li x AlSi 0.1 alloys, compared with the small increase during the initial charge. This result suggest that the matrix materials should have a small coefficient of elasticity to give low stress on expansion of the active alloy, together with a large elastic deformation to compensate for volume reduction. This is contrary to generally accepted argument that the matrix should have a high ductility. EIS results for measurement of intrinsic resistance and reaction kinetics during initial lithium insertion into nano-Sn and AlSi 0.1 alloys show that both solid electrolyte interphase (SEI) films formed on particle surfaces, together with particle pulverization, are responsible for the high contact resistance. The electrochemical kinetics of both lithium charge and discharge are controlled by contact resistance at high states of charge.", "keywords": [ "Contact resistance", "Lithium alloy anode", "Electrochemical impedance spectroscopy" ], "authors": [ { "name": "Chunsheng Wang", "org": "texas a m university" }, { "name": "A. John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A and M University, College Station, Texas 77843-3402, USA" }, { "name": "Frank E. Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A and M University, College Station, Texas 77843-3118, USA" } ], "venue": "Journal of Power Sources", "year": 2001 }, "sPU78wDy": { "id": "sPU78wDy", "title": "Composite doped emeraldine–polyethylene oxide-bonded lithium-ion nano-tin anodes with electronic–ionic mixed conduction", "abstract": "Mixed-conducting lithium-ion doped emeraldine polyaniline (PAni)–polyethylene oxide (PEO) blends have been developed to achieve an optimal electronic–ionic conductivity balance in nano-tin composite anodes. Electrochemical evaluation was performed on the anodes with differing electrode preparation procedures, doping methods and PEO contents. Results indicate that both good electronic and ionic conductivity in the binder are required for rapid lithium insertion/extraction and low polarization. This doped PAni–PEO polymer blend is an attractive binder for high capacity composite anodes with low polarization.", "keywords": [ "nano-tin", "polyaniline", "composite electrode", "polymer blend", "mixed conductivity", "polyethylene oxide", "ionic conductivity" ], "authors": [ { "name": "Xiang-Wu Zhang", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "Chunsheng Wang", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "A.John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "Frank E Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3118, USA" } ], "venue": "Solid State Ionics", "year": 2002 }, "qvDrT7s2": { "id": "qvDrT7s2", "title": "Criteria for Reliable Electrochemical Impedance Measurements on Li-Ion Battery Anodes", "abstract": "", "keywords": [ "impedance measurement" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "A. John Appleby", "org": "" }, { "name": "Frank E. Little", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2003 }, "xS3RnYKI": { "id": "xS3RnYKI", "title": "Electrochemical performance of lithium ion battery, nano-silicon-based, disordered carbon composite anodes with different microstructures", "abstract": "Nano-silicon-based disordered carbon composites prepared by mechanical milling and pyrolysis have been examined as anodes of a lithium ion cell. Electrochemical measurements show that the charge–discharge capacity of disordered carbon composites incorporating both silicon-polyparaphenylene (Si-PPP) and silicon-polyvinyl chloride (Si-PVC) with differing silicon contents, decreases with increasing pyrolysis temperature. Si-PVC-based materials have a better cycle life than those based on Si-PPP at the same silicon content.", "keywords": [ "polyvinyl chloride (pvc)", "silicon", "eis", "lithium ion battery", "disordered carbon", "polyvinyl chloride pvc", "polyparaphenylene (ppp)", "polyparaphenylene ppp", "microstructures" ], "authors": [ { "name": "Xiang-Wu Zhang", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "Prashanth K Patil", "org": "Department of Chemistry and Chemical Engineering, Lamar University, PO Box 10022, Beaumont, TX 77710, USA" }, { "name": "Chunsheng Wang", "org": "" }, { "name": "A.John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "Frank.E Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "David L Cocke", "org": "Department of Chemistry and Chemical Engineering, Lamar University, PO Box 10022, Beaumont, TX 77710, USA" } ], "venue": "Journal of Power Sources", "year": 2004 }, "ipmnhk3l": { "id": "ipmnhk3l", "title": "Alkaline Fuel Cell with Intrinsic Energy Storage", "abstract": "", "keywords": [ "energy storage" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "A. John Appleby", "org": "" }, { "name": "David L. Cocke", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2004 }, "TtXcfVjI": { "id": "TtXcfVjI", "title": "Self-discharge of secondary lithium-ion graphite anodes", "abstract": "A new method for measuring self-discharge of lithium-ion graphite anodes is reported. First, the anode lithium content is calculated from the open-circuit potential as a function of open-circuit time (OCP versus OCT) using equilibrium potential–composition isotherms. Then, the self-discharge rate is obtained from the differential of lithium content with respect to time on open circuit. The self-discharge rate measured by this means after the first charge–discharge cycle to 0.0 V versus Li/Li + is largely controlled by the growth of the solid electrolyte interphase (SEI) film, with some influence from stage transformation.", "keywords": [ "graphite anode", "self-discharge", "solid electrolyte interphase", "li-ion batteries", "open circuit potential" ], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "Xiang-wu Zhang", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "A.John Appleby", "org": "Center for Electrochemical Systems and Hydrogen Research, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3402, USA" }, { "name": "Xiaole Chen", "org": "Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA" }, { "name": "Frank E Little", "org": "Center for Space Power, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843-3118, USA" } ], "venue": "Journal of Power Sources", "year": 2002 }, "Z8Yrtktv": { "id": "Z8Yrtktv", "title": "Low-Temperature Characterization of Lithium-Ion Carbon Anodes via Microperturbation Measurement", "abstract": "", "keywords": [], "authors": [ { "name": "Chunsheng Wang", "org": "" }, { "name": "A. John Appleby", "org": "" }, { "name": "Frank E. Little", "org": "" } ], "venue": "Journal of The Electrochemical Society", "year": 2002 }, "i6P6I0T1": { "id": "i6P6I0T1", "title": "In Situ Ionic/Electric Conductivity Measurement of La[sub 0.55]Li[sub 0.35]TiO[sub 3] Ceramic at Different Li Insertion Levels", "abstract": "", "keywords": [ "electric conductivity" ], "authors": [ { "name": "Chunsheng Wang", "org": "tennessee technological university" }, { "name": "Prashanth Patil", "org": "lamar university" }, { "name": "A. John Appleby", "org": "texas a m university" }, { "name": "Frank. E. Little", "org": "texas a m university" }, { "name": "Mehmet Kesmez", "org": "lamar university" }, { "name": "David L. Cocke", "org": "lamar university" } ], "venue": "Journal of The Electrochemical Society", "year": 2004 }, "A0c8TFHw": { "id": "A0c8TFHw", "title": "Irreversible capacities of graphite anode for lithium-ion batteries", "abstract": "Electrochemical impedance spectroscopy (EIS) and in-situ intrinsic resistance measurements were applied to sandwiched disk graphite electrodes to investigate the mechanism of formation of irreversible capacity during initial galvanostatic or potentiostatic lithium intercalation into graphite in four different electrolyte formulations. The stability of the solid ∣ electrolyte interphase (SEI) film formed during pre-cycling eight times between 1.5 and 0.2 V versus Li ∣ Li + in 1.0 M LiPF 6 +ethylene carbonate (EC) based electrolytes was studied using EIS and in-situ intrinsic resistance measurements during subsequent cycling in the same electrolyte between 0.4 and 0.0 V, and in 1 M LiPF 6 –propylene carbonate (PC) between 0.4 and 0.0 V. The purpose of the first set of results was to investigate the effect of the volume change resulting from stage transformation during Li intercalation–deintercalation on the stability of the previously formed SEI film. The second measurements were taken to study the reaction of the corresponding film in PC electrolyte. Results show that the two potential plateaus at around 0.9 and 0.6 V in the first galvanostic charge largely correspond to solvated Li intercalation into graphite with some contribution from the formation of the SEI film. In EC-containing mixtures, this solvent has little influence on co-intercalation at 0.9 V, but can effectively inhibit the process at 0.6 V. Potentiostatic charging at 0.2 or 0.7 V accelerates co-intercalation. Although the SEI film formed during cycling in EC-containing electrolytes can inhibit PC co-intercalation during subsequent cycles in the presence of this solvent, a new layer of different SEI film may also form. Keywords Irreversible capacity Intrinsic resistance Electrochemical impedance spectroscopy Li-ion batteries 1 Introduction The electrolytes used for lithium-ion cells are thermodynamically unstable at potentials close to the Li ∣ Li + electrode potential, and solvents such as propylene carbonate (PC) can co-intercalate with Li into graphite with subsequent reduction and/or decomposition of solvent. It has been suggested that this is because of the formation of solvent lithium/graphite compounds of Li(sol) y C 6 type (graphite insertion compounds, GICs) may be more favorable than the formation of LiC 6 during insertion [1] . Fortunately the decomposition products of some electrolyte solvents, e.g. ethylene carbonate (EC) form a stable solid ∣ electrolyte interphase (SEI) film on the graphite surface, which is permeable to Li + cations, but is electronically insulating, and prevents further electrolyte decomposition and co-insertion during cycling. The success of rechargeable lithium-ion batteries is largely due to the stable formation of such SEI films on graphite or carbon anodes. The stability of the SEI film determines the safety, power capability, self-discharge rate, and cycle life of the battery. SEI film formation on a graphite surface and solvated lithium intercalation between the graphite layers in the first few Li intercalation–deintercalation cycles are accompanied by irreversible consumption of lithium and electrolyte. Since the cathode is the only source of lithium in a lithium-ion battery, these losses are detrimental to specific energy and must be minimized for optimum performance. The irreversible capacity associated with the use of graphite is extremely dependent on electrolyte composition, the rate of lithiation during the formation cycles, temperature, the surface structure of graphite, and the extent of charge–discharge cycles [2] . PC and EC are the most commonly used high permittivity solvents for lithium-ion batteries. It is well known that EC-based electrolytes are always used with graphite anodes. In contrast, PC-based electrolytes are used with carbons, and are not compatible with graphite anodes due to both continuous PC decomposition without stable passive graphite ∣ electrolyte interphase formation, and continuous PC–Li co-intercalation into the graphite planes [3] . Nevertheless, PC is still an attractive electrolyte, especially for low-temperature operation, because of its high salt solubility and low melting point (−55 °C). One approach to suppressing irreversible solvated lithium intercalation is by first precycling a graphite electrode once in an EC- or dimethyl carbonate (DMC) based electrolyte, then recycling it in a PC-based electrolyte [4,5] . It is believed that a stable passivating SEI film formed in EC- or DMC-based electrolyte may retard co-intercalation of PC during subsequent cycling, but any changes in the SEI film after cycling in PC-based electrolytes are still unclear. A low irreversible capacity requires that the thin SEI film should have good adhesion to graphite, high mechanical strength, and high flexibility to accommodate the volume change during intercalacation–deintercalation. As far we know, no work on these topics has been reported. In this paper, the irreversible capacity associated with solvated Li intercalation and SEI formation on JM 287 (Johnson Matthey, Inc.) graphite [6] during the first few galvanostatic and potentiostic cycles in different electrolytes has been investigated using electrochemical impedance spectroscopy (EIS) along with in-situ intrinsic resistance measurement. The changes in the SEI film in PC-based electrolytes after eight previous cycles in EC+PC+DMC (1:1:3) electrolyte were also studied. The influence of volume change due to stage transformation on the stability of SEI film was monitored by changes in the irreversible capacity on cycling between 0.4 and 0.0 V versus Li ∣ Li + after eight cycles between 1.5 and 0.2 V. 2 Experimental 2.1 Electrode and cell preparation Electrodes consisting of ca. 50 mg of ball-milled JM 287 graphite powder (particle size ca. 15 microns, BET area as received 13.5 m 2 g −1 , after milling >30 m 2 g −1 ) 1 1 The material was identical to that used previously [6] , but earlier papers neglected to state that it was further milled. between two nickel screens (geometric area 2.0 cm 2 ) were prepared as in our previous work [6–10] . The electrochemical measurements were conducted in a three-electrode PTFE cell containing two lithium foils as both counter and reference electrodes (REs). All potentials given are versus the Li ∣ Li + RE in the four electrolytes studied, which were 1.0 M LiPF 6 in 1: 1 (by volume) E+DMC, 1:1:3 EC+PC+DMC, 4:1:3:2 EC+PC+DMC+EMC, and pure PC. All were High Purity Lithium Battery Grade (Mitsubishi Chemical Company). Charge (lithium intercalation) and discharge (lithium deintercalation) characteristics were measured using an Arbin (College Station, TX) automatic battery cycler. In-situ intrinsic resistances were measured by the application of a 10 mA constant current across the electrode. The electrodes were charged–discharged on one side only, and the voltage differences across both sides were used to measure their overall intrinsic resistances. This refers to those physical elements present within the thickness of the electrode, including the electronic resistance of the series-parallel array of graphite particles themselves, the electronic contacts with and within the binder and ionic (electrolytic) contacts, and the electronic resistances of the current collectors and the contact resistances between them and the neighboring graphite particles. This intrinsic resistance and transmissive impedance can be evaluated by the voltage across the electrode with flowing d.c. current and by transmissive EIS methods, respectively. Potentiostatic charge–discharge was applied on the electrodes in the range 3.0–0.2 V using different programmed potential steps, viz., from 3.0 to 0.7 to 0.2 V, then back to 0.7 and to 3.0 V, and second, between 1.5 and 0.2 V. Each step was initiated only when the current became less than 1.0 μA. Galvanostatic charge–discharge was also used between 1.5 and 0.2 V. After eight potentiostatic or galvanostatic charge–discharge cycles to form the SEI film completely, some electrodes were again cycled in the same electrolyte between 0.4 and 0.0 V to investigate the influence of volume change of the graphite electrode on SEI film stability. Other electrodes which had been pre-cycled eight times between 1.5 and 0.2 V in the EC+PC+DMC (1:1:3) and EC+PC+DMC+EMC (4:1:3:2) electrolytes were transferred to the PC electrolyte at 1.5 V. After a 20 h rest period, they were then cycled galvanostatically between 0.4 and 0.0 V in the PC electrolyte. 2.2 EIS measurement The EIS was measured over the frequency range 65 kHz–1.0 mHz at a potentiostatic signal amplitude of 5 mV, using Solatron equipment as in previous work [6–10] . In all cases, EIS measurements were performed after a rest period of 3 h. For transmissive impedance measurement, EIS measurements were taken between the two sides of the electrode, connecting the RE 2 and WE terminals of the Solatron interface together to one of the sides, and RE 1 and CE to the other ( Fig. 1 ). For electrochemical reaction kinetics measurements, EIS scans were made by connecting the terminals RE 2 plus WE terminals of the Solatron interface to both sides of the graphite working electrode (WE). A schematic diagram of the cell and the different interface terminal-to-electrode connections, including the geometrical arrangement of the counter and REs for each protocol, is shown in Fig. 1 . The physical meaning of the two EIS measurement protocols have been discussed in our previous papers [8] . 3 Results and discussion 3.1 Initial galvanostatic and potentiostic charge–discharge behavior of anodes between 1.5 and 0.2 V (single phase region) To remove the influence of electrode volume changes resulting from stage transformations during Li intercalation–deintercalation, fresh electrodes were first cycled in each of the electrolytes. In 1 M LiPF 6 +PC, the 10 mA d.c. current passed through the electrode for intrinsic resistance measurement was interrupted because graphite exfoliation due to PC intercalation results in a significant voltage across the electrode. The potential on both side of the electrode was, therefore, monitored instead in this case. The first galvanostatic charge–discharge curves of JM 287 electrodes in the four electrolytes are shown in Fig. 2 . The potential profiles in three EC-based electrolytes show two similar potential plateaus at around 0.9 and 0.6 V, while only one potential plateau around 1.0 V appeared in PC. Winter et al. [1,11,12] believe that both potential plateaus at 0.9 and 0.6 V mainly result from the progressive staging of solvated Graphite Intercalation Compounds (GIC), with some contribution from SEI film formation [3] . For the electrode in PC electrolyte, the potential at the side being charged began to decrease at around 300 mA h g −1 capacity, and dropped more rapidly at 550 mA h g −1 , while the potential at the opposite side was stable at about 1.0 V during the entire charge period. This suggests that exfoliation by PC intercalation fractured the electrode, in agreement with the results of Aurbach et al. [13] and Yoshio et al. [14] Adding a small amount of EC (20%) to the PC+DMC electrolyte significantly suppressed the PC intercalation capacity loss at around 1–0.9 V from 520 to 60 mA h g −1 . However, further increasing the EC content to 40% in PC+DMC+EMC electrolyte decreased intercalation only between 0.6 and 0.2 V, and had little influence on the irreversible capacity at 0.9 V. The reason for this may be explained by the fact that both EC and DMC intercalate into graphite at 0.9 V [12] . The passivating SEI film formed from EC decomposition products gives complex three-dimensional solvated ternary GICs, which can inhibit the solvent intercalation at 0.6 V. Similar behavior was reported by Yu et al. [15] for KS 10 graphite during the first charge–discharge cycle in the EC+PC+DMC (1:1:3) and EC+DME (1:1) electrolytes. The irreversible capacities increased with decreasing the EC content of the electrolytes in the order EC+DMC (EC 50 vol.%)