The Experts below are selected from a list of 11523 Experts worldwide ranked by ideXlab platform
Jusef Hassoun - One of the best experts on this subject based on the ideXlab platform.
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a lithium ion sulfur battery using a polymer polysulfide added membrane
Scientific Reports, 2015Co-Authors: Marco Agostini, Jusef HassounAbstract:In this paper we report the performances of a lithium-ion sulfur battery characterized by a polymer configuration. The cell, based on a sulfur-carbon cathode, a Li-Sn-C nanostructured anode and a PEO-based, polysulfide-added electrolyte, shows very good electrochemical performances in terms of stability and delivered capacity. The remarkable cell performances are ascribed to the mitigation of the cathode dissolution process due to the Buffer Action ensured by the polysulfide added to the polymer electrolyte. This electrolyte configuration allows the achievement of a stable capacity ranging from 500 to 1500 mAh gS-1, depending on the cycling rate. The use of a polymer electrolyte and the replacement of the lithium metal with a Li-Sn-C nanostructured alloy are expected to guarantee high safety content, thus suggesting the battery here studied as advanced energy storage system.
Marco Agostini - One of the best experts on this subject based on the ideXlab platform.
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a lithium ion sulfur battery using a polymer polysulfide added membrane
Scientific Reports, 2015Co-Authors: Marco Agostini, Jusef HassounAbstract:In this paper we report the performances of a lithium-ion sulfur battery characterized by a polymer configuration. The cell, based on a sulfur-carbon cathode, a Li-Sn-C nanostructured anode and a PEO-based, polysulfide-added electrolyte, shows very good electrochemical performances in terms of stability and delivered capacity. The remarkable cell performances are ascribed to the mitigation of the cathode dissolution process due to the Buffer Action ensured by the polysulfide added to the polymer electrolyte. This electrolyte configuration allows the achievement of a stable capacity ranging from 500 to 1500 mAh gS-1, depending on the cycling rate. The use of a polymer electrolyte and the replacement of the lithium metal with a Li-Sn-C nanostructured alloy are expected to guarantee high safety content, thus suggesting the battery here studied as advanced energy storage system.
Toshiharu Kazama - One of the best experts on this subject based on the ideXlab platform.
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Buffer Action of fluid films 2nd report experiment
Hydraulics & Pneumatics, 1991Co-Authors: Atsushi Yamaguchi, Toshiharu KazamaAbstract:In order to clarify the Buffer Action of fluid films on impulse and vibration, the behavior is examined experimentally by using a model of normally impacting two bodies. The model consists of fluid film, impacting objects (a cylinder and sphere) and a cantilever. Fluid film thickness, initial height and mass of the cylinder and sphere, and deflection of a cantilever are used as parameters. By estimating the Buffer Action with the coefficient of rebound, for the case where the impacting velocity is relatively small and film thickness is comparatively large, the coefficient of rebound becomes small, that is, the Buffer Action is clearly recognized. For the case of the same value of the momentum before the impact, the area-contacting is able to obtain a larger Buffer Action than point-contacting. The comparison with and the discussion about the theoretical results are also presented.
Dassargues Alain - One of the best experts on this subject based on the ideXlab platform.
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Self-organizing maps for groundwater quality assessment of a Belgian chalk aquifer in the presence of 1,1,1-Trichloroethane abiotic degradation
2021Co-Authors: Boudjana Youcef, Brouyère Serge, Gasparella Davide, Dassargues AlainAbstract:In a Belgian chalky aquifer, groundwater quality has been locally affected by a mixture of Chlorinated Aliphatic Hydrocarbons (CAHs) dominated by 1,1,1-trichloroethene (1,1,1-TCA). The first results showed that the latter undergoes abiotic degradation by hydrolysis and dehydrohalogenation in the saturated zone. The released acids (hydrochloric and acetic acid) from these reActions influence calcite Buffer Action in the aquifer and change locally the water hydrochemistry. In addition, the leaching of soluble inorganic compounds from a backfill layer has also influenced the groundwater composition in the same area. Calcium sulfate has migrated to the saturated zone with recharge water. To confirm the first findings and elucidate the effect of each pollution source on the groundwater quality, 3 datasets from 3 annual sampling campaigns were used for Kohonen's Self-Organizing Map (SOM) analysis. The groundwater chemistry dataset used comprised: pH, electrical conductivity, Ca2+, Cl-, SO42-, HCO3-, (Ca2+-HCO3- ), TCE, 1,1,1-TCA, 1,1-DCE and the molar ratio 1,1-DCE/(1,1,1-TCA + 1,1-DCE). For each dataset, 3 clusters were identified within the groundwater plume. The first cluster is characterized by a chemical composition that reflects the presence of 1,1,1-TCA degradation reAction products, an increased calcite dissolution, and migration of Ca2+ and SO42- from backfill soil to the groundwater. The second cluster is characterized mainly by the effect of Ca2+ and SO42- migration to groundwater. The third cluster reflects the less contaminated groundwater with a composition approaching the groundwater background composition (before pollution) in the studied aquifer. The cluster's spatial distribution and their chemical specifications were quite similar between the 3 datasets. In this study, the application of SOM’s is a useful tool to improve the understanding of groundwater quality changes in a contaminated site. Based on this multivariate statistical method, detection of zones influenced by two different groundwater pollution sources was possible within the studied plume. The combination of SOM’s results with the results from: backfill soil characterization, sulfate isotopic signature in groundwater, compared to the one in backfill eluates, has led to a better understanding of the ongoing mechanisms influencing hydrochemistry in this study site.Peer reviewe
Atsushi Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Buffer Action of fluid films 2nd report experiment
Hydraulics & Pneumatics, 1991Co-Authors: Atsushi Yamaguchi, Toshiharu KazamaAbstract:In order to clarify the Buffer Action of fluid films on impulse and vibration, the behavior is examined experimentally by using a model of normally impacting two bodies. The model consists of fluid film, impacting objects (a cylinder and sphere) and a cantilever. Fluid film thickness, initial height and mass of the cylinder and sphere, and deflection of a cantilever are used as parameters. By estimating the Buffer Action with the coefficient of rebound, for the case where the impacting velocity is relatively small and film thickness is comparatively large, the coefficient of rebound becomes small, that is, the Buffer Action is clearly recognized. For the case of the same value of the momentum before the impact, the area-contacting is able to obtain a larger Buffer Action than point-contacting. The comparison with and the discussion about the theoretical results are also presented.
