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| 1 | Assimilating Surface Observations in a Four-Dimensional Variational Doppler Radar Data Assimilation System to Improve the Analysis and Forecast of a Squall Line Case显示文摘This paper examines how assimilating surface observations can improve the analysis and forecast ability of a fourdimensional Variational Doppler Radar Analysis System(VDRAS).Observed surface temperature and winds are assimilated together with radar radial velocity and reflectivity into a convection-permitting model using the VDRAS four-dimensional variational(4DVAR) data assimilation system.A squall-line case observed during a field campaign is selected to investigate the performance of the technique.A single observation experiment shows that assimilating surface observations can influence the analyzed fields in both the horizontal and vertical directions.The surface-based cold pool,divergence and gust front of the squall line are all strengthened through the assimilation of the single surface observation.Three experiments—assimilating radar data only,assimilating radar data with surface data blended in a mesoscale background,and assimilating both radar and surface observations with a 4DVAR cost function—are conducted to examine the impact of the surface data assimilation.Independent surface and wind profiler observations are used for verification.The result shows that the analysis and forecast are improved when surface observations are assimilated in addition to radar observations.It is also shown that the additional surface data can help improve the analysis and forecast at low levels.Surface and low-level features of the squall line—including the surface warm inflow,cold pool,gust front,and low-level wind—are much closer to the observations after assimilating the surface data in VDRAS. | Xingchao CHEN Kun ZHAO Juanzhen SUN Bowen ZHOU Wen-Chau LEE | 2016 | Advances in Atmospheric Sciences2016，33，10： | 6 |
| 2 | N-doped porous carbon nanofibers sheathed pumpkin-like Si/C composites as free-standing anodes for lithium-ion batteries显示文摘Dramatic capacity fading and poor rate performance are two main obstacles that severely hamper the widespread application of the Si anode owing to its large volume variation during cycling and low intrinsic electrical conductivity.To mitigate these issues,free-standing N-doped porous carbon nanofibers sheathed pumpkin-like Si/C composites(Si/C-ZIF-8/CNFs)are designed and synthesized by electrospinning and carbonization methods,which present greatly enhanced electrochemical properties for lithium-ion battery anodes.This particular structure alleviates the volume variation,promotes the formation of stable solid electrolyte interphase(SEI)film,and improves the electrical conductivity.As a result,the as-obtained free-standing Si/C-ZIF-8/CNFs electrode delivers a high reversible capacity of 945.5 mAh g^(-1) at 0.2 A g^(-1) with a capacity retention of 64% for 150 cycles,and exhibits a reversible capacity of 538.6 mA h g^(-1) at 0.5 A g^(-1) over 500 cycles.Moreover,the full cell composed of a freestanding Si/C-ZIF-8/CNFs anode and commercial LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(NCM)cathode shows a capacity of 63.4 mA h g^(-1) after 100 cycles at 0.2 C,which corresponds to a capacity retention of 60%.This rational design could provide a new path for the development of high-performance Si-based anodes. | Yanfei Zeng Yudai Huang Niantao Liu Xingchao Wang Yue Zhang Yong Guo Hong-Hui Wu Huixin Chen Xincun Tang Qiaobao Zhang | 2021 | Journal of Energy Chemistry2021，30，3： | 6 |
| 3 | Core-shell structured 1,4-benzoquinone@TiO_2 cathode for lithium batteries显示文摘Organic carbonyl compounds are considered as promising candidates for lithium batteries due to their high capacity and environmental friendliness. However, they suffer from serious dissolution in the electrolyte, leading to fast capacity decay. Here we report core-shell structured 1,4-benzoquinone@titanium dioxide(BQ@TiO_2) composite as cathode for lithium batteries. The composite cathode can deliver a high discharge capacity of 441.2 mA h/g at 50 m A/g and a high capacity retention of 80.7% after 100 cycles. The good cycling performance of BQ@TiO_2 composite can be attributed to the suppressed dissolution of BQ,which results from the physical confinement effect of TiO_2 shell and the strong interactions between BQ and TiO_2. Moreover, the combination of ex situ infrared spectra and density functional theory calculations reveals that the active redox sites of BQ are carbonyl groups. This work provides an alternative way to mitigate the dissolution of small carbonyl compounds and thus enhance their cycling stability. | Aikai Yang Xingchao Wang Yong Lu Licheng Miao Wei Xie Jun Chen | 2018 | Journal of Energy Chemistry2018，27，6： | 2 |
| 4 | A novel PMA/PEG-based composite polymer electrolyte for all-solid-state sodium ion batteries显示文摘In recent years,development of all-solid-state batteries has become a promising approach to improve the safety of batteries.Herein,we report the preparation of a new composite polymer electrolyte (CPE)for use in all-solid-state sodium ion batteries.The CPE comprising of poly(methacrylate)(PMA),poly(ethylene glycol)(PEG),α-Al2O3 with acidic surface sites,and NaClO4 exhibited high ionic conductivity (1.46×10^-4 S·cm^-1 at 70℃),wide electrochemical stability window (4.5V vs.Na+/Na),and good mechanical strength.With the introduction of the prepared CPE and Na3V2(PO4)3,the final all-solid-state sodium ion batteries showed good rate and cycle performance,with a high reversible capacity of 85mAh·g^-1 when operated at 0.5C (1C=118mA·g^-1)and 94.1%capacity retention rate after 350cycles at 70℃.Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries. | Xuejing Zhang Xingchao Wang Shuang Liu Zhanliang Tao Jun Chen | 2018 | Nano Research2018，11，12： | 2 |
| 5 | IL-12 Facilitates Both the Recovery of Endogenous Hematopoiesis and the Engraftment of Stem Cells after Ionizing Radiation显示文摘 | Tingchao Chen Kathleen A. Burke Yuxia Zhan Xingchao Wang Darryl Shibata Yi Zhao | 2007 | Experimental Hematology2007，，2： | 1 |
| 6 | Enhanced room-temperature Naþionic conductivity in Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)显示文摘Developing cost-effective and reliable solid-state sodium batteries with superior performance is crucial for stationary energy storage.A key component in facilitating their application is a solid-state electrolyte with high conductivity and stability.Herein,we employed aliovalent cation substitution to enhance ionic conductivity while preserving the crystal structure.Optimized substitution of Y^(3+)with Zr^(4+)in Na_(5)YSi_(4)O_(12) introduced Naþion vacancies,resulting in high bulk and total conductivities of up to 6.5 and 3.3 mS cm^(-1),respectively,at room temperature with the composition Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)(NYZS).NYZS shows exceptional electrochemical stability(up to 10 V vs.Naþ/Na),favorable interfacial compatibility with Na,and an excellent critical current density of 2.4 mA cm^(-2).The enhanced conductivity of Naþions in NYZS was elucidated using solid-state nuclear magnetic resonance techniques and theoretical simulations,revealing two migration routes facilitated by the synergistic effect of increased Naþion vacancies and improved chemical environment due to Zr^(4+)substitution.NYZS extends the list of suitable solid-state electrolytes and enables the facile synthesis of stable,low-cost Naþion silicate electrolytes. | Aikai Yang Kai Yao Mareen Schaller Enkhtsetseg Dashjav Hang Li Shuo Zhao Qiu Zhang Martin Etter Xingchen Shen Huimin Song Qiongqiong Lu Ruijie Ye Igor Moudrakovski Quanquan Pang Sylvio Indris Xingchao Wang Qianli Ma Frank Tietz Jun Chen Olivier Guillon | 2023 | eScience2023，3，6： | 0 |
| 7 | Lymphocyte integrins mediate entry and dysregulation of T cells by SARS-CoV-2显示文摘Dear Editor,T-cell infection by SARS-CoV-2 and associated immune responses are correlated with disease severity and prognosis of COVID-19.Lymphopenia is associated with increased disease severity in COVID-19.Significantly lower circulating T and B cell counts were observed in patients who died from COVID-19 compared with survivors.Moreover,SARS-CoV-2 infection causes aberrant lymphocyte activation and dysfunction. | Mengwen Huang Xingchao Pan Xinling Wang Qingfei Ren Bei Tong Xianchi Dong Gaoxiang Ge Lu Lu Shibo Jiang Jianfeng Chen | 2023 | Signal Transduction and Targeted Therapy2023，8，3： | 0 |
| 8 | Characteristics of biomarkers in source rocks of the Ganquan Formation in the Dahulishan region, Ejina Banner显示文摘Based on gas chromatography and gas chromatography mass spectrometry techniques, the authors examined biomarker characteristics of the Ganquan Formation source rocks in the area of Dahulishan, Ejina, and analyzed the information and petroleum geological significance that were indicated by the source of organic matter, sedimentary environment and maturity and so on. Gas chromatography peak of saturated hydrocarbons from the Ganquan Formation source rocks showed 'the former peak' of the single peak distribution, the main peak of carbon being C18 , indicating the main sources of organic matter with marine organic matter. Pr/Ph ranges from 0.3 to 0.6, indicating a strongly reducing sedimentary environment. Biomarker assemblages of the Ganquan Formation source rocks are abundant in tricyclic terpane with long side chains, with a high level of gammacerane, showing dominant distribution of C27 sterane. High contents of gammacerane in organic matter show organic facies of source rocks in the saltwater sedimentary environment. That average hopane/sterane ratio is 0.59, showing that algae have made more contributions to organic matter than bacteria. And the high level of C27 steranes shows that algae are the main source of hydrocarbon precursors. The Ganquan Formation's methylphenanthrene index, which is an effective molecular parameter index to measure thermal evolution of organic matter, ranges from 0.35 to 0.50, and the conversion of vitrinite reflectance Rc from it is within the range of 2.00-2.09, indicating that the Ganquan Formation source rocks are in the over-mature stage of thermal evolution. | SU Kui TANG Youjun JIANG Xingchao CHEN Jianfa | 2013 | Chinese Journal Of Geochemistry2013，32，3： | 0 |
| 9 | Electrolyte solvation chemistry to construct an anion-tuned interphase for stable high-temperature lithium metal batteries显示文摘Lithium metal batteries are regarded as promising alternative next-generation energy storage systems.However,the unstable anode interphase results in dendrite growth and irreversible lithium consumption with low Coulombic efficiency(CE).Herein,we rationally design a Li^(+)coordination structure via electrolyte solvation chemistry.Nitrate anions are aggregated in the solvation sheath,even at low concentration in a solvent with moderate solvation ability,which promotes Li^(+)desolvation and constructs a nitrate anion-tuned interphase.Meanwhile,a high-donor-number solvent is introduced as an additive to strongly coordinate with Li^(+),which accelerates the ion-transfer kinetics and rate performance.This not only results in micro-sized lithium deposition and a high CE of 99.5%over 3500 h,but also enables superior anode stability even under 50%depth plating/stripping and with a lean electrolyte of 3 g Ah^(-1)at 50℃.A lithium-sulfur battery exhibits a prolonged lifespan of 2000 cycles with an average CE of 100%.A full battery using 1x excess lithium exhibits a high capacity near 1600 mAh g S^(-1)for 100 cycles without capacity loss.Moreover,a 0.55 Ah pouch cell delivers a reversible energy density of 423 Wh kg^(-1)based on these electrodes and electrolyte. | Jiahang Chen Yang Zhang Huichao Lu Juan Ding Xingchao Wang Yudai Huang Huiyang Ma Jiulin Wang | 2023 | eScience2023，3，4： | 0 |
| 10 | Improving the Analyses and Forecasts of a Tropical Squall Line Using Upper Tropospheric Infrared Satellite Observations显示文摘The advent of modern geostationary satellite infrared radiance observations has noticeably improved numerical weather forecasts and analyses.However,compared to midlatitude weather systems and tropical cyclones,research into using infrared radiance observations for numerically predicting and analyzing tropical mesoscale convective systems remain mostly fallow.Since tropical mesoscale convective systems play a crucial role in regional and global weather,this deficit should be addressed.This study is the first of its kind to examine the potential impacts of assimilating all-sky upper tropospheric infrared radiance observations on the prediction of a tropical squall line.Even though these all-sky infrared radiance observations are not directly affected by lower-tropospheric winds,the high-frequency assimilation of these all-sky infrared radiance observations improved the analyses of the tropical squall line’s outflow position.Aside from that,the assimilation of all-sky infrared radiance observations improved the analyses and prediction of the squall line’s cloud field.Finally,reducing the frequency of assimilating these all-sky infrared radiance observations weakened these improvements to the analyzed outflow position,as well as the analyses and predictions of cloud fields. | Man-Yau CHAN Xingchao CHEN | 2022 | Advances in Atmospheric Sciences2022，39，5： | 0 |
| 11 | Oxidation behavior of non-stoichiometric(Zr,Hf,Ti)C_(x) carbide solid solution powders in air显示文摘Multi-component solid solutions with non-stoichiometric compositions are characteristics of ultra-high temperature carbides as promising materials for hypersonic vehicles.However,for group IV transition-metal carbides,the oxidation behavior of multi-component non-stoichiometric(Zr,Hf,Ti)C_(x)carbide solid solution has not been clarified yet.The present work fabricated four kinds of(Zr,Hf,Ti)C_(x)carbide solid solution powders by free-pressureless spark plasma sintering to investigate the oxidation behavior of(Zr,Hf,Ti)C_(x)in air.The effects of metallic atom composition on oxidation resistance were examined.The results indicate that the oxidation kinetics of(Zr,Hf,Ti)C_(x)are composition dependent.A high Hf content in(Zr,Hf,Ti)C_(x)was beneficial to form an amorphous Zr-Hf-Ti-C-0 oxycarbide layer as an oxygen barrier to enhance the initial oxidation resistance.Meanwhile,an equiatomic ratio of metallic atoms reduced the growth rate of(Zr,Hf,Ti)O_(2)oxide,increasing its phase stability at high temperatures,which improved the oxidation activation energy of(Zr,Hf,Ti)C_(x). | Huilin LUN Yi ZENG Xiang XIONG Ziming YE Zhongwei ZHANG Xingchao LI Haikun CHEN Yufeng LIU | 2021 | Journal of Advanced Ceramics2021，10，4： | 0 |
| 12 | Extraction of selected rare earth elements from anthracite acid mine drainage using supercritical CO2 via coagulation and complexation显示文摘Rare earth elements(REEs)are valuable raw materials which are in great demand in modern high technology industries.Developing methods to produce/recover REEs from waste is significant to the national security of any developed country.This study was focused on investigating the use of supercritical CO2(sCO2)to extract REEs from anthracite acid mine drainage(AMD).Four different mine drainage water source locations at Blaschak Coal Corp.in Pennsylvania,USA were selected for sample collection.An extraction process was developed and demonstrated for two of those water sources containing the highest concentration of REEs.A method involving metal ion coagulation,their dissolution from the sludge into a concentrated aqueous HNO3 solution,complexation with organic ligands and sCO2 extraction was developed to recover REEs from AMD.Specifically,sodium aluminate(NaAlO2)was used as the coagulant to concentrate REEs from the AMD into a solid precipitate.Consequently,over 99%of the REEs in AMD is concentrated in the remaining sludge.During the coagulation process,the effects of pH and NaAlO2 concentration on REE precipitation were investigated.Fuming nitric acid(HNO3)was used to digest the pre-concentrated sludge and tributyl phosphate(TBP)was used to form REE/TBP/HNO3,a non-polar complex with selected REEs,specifically,cerium(Ce),lanthanum(La)and neodymium(Nd).HNO3 concentration and organic/aqueous phase ratio were considered as the variables to improve complexation efficiency.Dynamic extraction experiments using sCO2 and REE/TBP/HNO3 solutions were then conducted at optimal conditions of 60℃and 20 MPa.The overall REE extraction efficiencies are found to increase with the atomic number of the REE.As a result,the average overall REE extraction efficiencies of 41.8%,40.1%and 58.2%for Ce,La and Nd,respectively,are obtained.The potential improvements in the overall extraction efficiency are also discussed. | Guanrong Song Xingchao Wang Carlos Romero Huazhi Chen Zheng Yao Alfred Kaziunas Rolf Schlake Madhu Anand Tom Lowe Greg Driscoll Boyd Kreglow Harold Schobert Jonas Baltrusaitis | 2021 | Journal of Rare Earths2021，39，1： | 0 |
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