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Converter-Based Reconfigurable Real-Time Electrical System Emulation Platform

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Chinese Journal of Electrical Engineering 2018年第1期4卷 20-27页

作者： Yiwei Ma Jingxin wang fred wang Leon M.Tolbert CURENT The University of TennesseeKnoxvilleTN 37996USA Oak Ridge National Laboratory Oak RidgeTN 37831USA

A Hardware Testbed(HTB)is developed for accurate and flexible emulation and testing of electrical power system and their control,measurement,and protection *** the HTB,modular and programmable power electronics converters are used to mimic the static and dynamic characteristics of electrical power *** paper overviews the development,integration,and application of the HTB,covering emulation principle,hardware and software configuration,and example results of power system research using the *** advantages of the HTB,compared with real-time digital simulation and downscaled hardware-based testing platform are discussed.

关键词： Emulation modeling real-time simulation

Modular Design Method for Motor Drives

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Chinese Journal of Electrical Engineering 2018年第1期4卷 1-10页

作者： Dong Jiang Puqi Ning Rixin Lai Zhihao Fang fred wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Electrical Engineering Chinese Academy of ScienceBeijing 100083China HITTOP Investment Management CO.LTD Beijing 100020China University of Tennessee KnoxvilleUSA

This paper introduces the concept of modular design methodology for hardware design and development of motor *** modular design process is first introduced separating the hardware development into three parts:controller,mother board and phase-leg *** control and circuit function can be decoupled from the phase-leg module *** hardware update can be simplified with the phase-leg module development and *** design examples are used to demonstrate this method:a DC-fed motor drive with Si IGBTs and an AC-fed motor drive with SiC *** of DC-fed motor drive aims at developing the converter with customized IGBT package for high *** with development of the converter with commercial IGBTs simplifies the *** the AC-fed motor drive is a more complex topology using more advanced devices,the modular design method can simplify and improve the development especially for new packaged ***,the modular design method can help to study the electromagnetic interference(EMI)issue for motor drives,which is presented with an extra design example.

关键词： Motor drive devices modular gate driver

中点钳位型三电平变换器两种故障状态的检测和保护

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电工技术学报 2010年第6期25卷 70-76页

作者：原熙博李永东 wang fred 清华大学电机工程与应用电子技术系北京100084 Center for Power Electronics Systems Virginia Polytechnic Institute and State University

针对中点钳位型三电平变换器的故障和保护进行研究,主要讨论系统的单相接地故障和电力电子器件短路故障。单相接地故障会引起变换器直流母线中点接地阻抗上的电压明显变化,提出一种通过检测接地阻抗电压从而检测系统接地故障的方法。变... 详细信息

针对中点钳位型三电平变换器的故障和保护进行研究,主要讨论系统的单相接地故障和电力电子器件短路故障。单相接地故障会引起变换器直流母线中点接地阻抗上的电压明显变化,提出一种通过检测接地阻抗电压从而检测系统接地故障的方法。变换器桥臂内侧电力电子器件的短路可以导致直流母线电容电压的不平衡,会出现电容电压的翻倍现象,须采取措施保护直流母线电容和电力电子器件。在分析电压翻倍现象产生原因的基础上,提出了抑制电容电压翻倍的方法。对以上两种故障状态的检测和保护进行了仿真和试验验证,仿真和试验结果验证了所提出方法的有效性。

关键词：三电平钳位型变换器故障状态器件短路故障接地故障检测

Application of GaN in Hard-switching Converters:Challenges and Potential Solutions

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电力电子技术 2017年第9期51卷 3-11页

作者： Bo LIU Zhe-yu ZHANG Edward Jones Fei(fred) wang University of Tennessee

This paper overviews the benefits,challenges,research trends and potential solutions on the design and application of gallium nitride(GaN) technology in hard-switching power electronic converters from the device level... 详细信息

关键词：氮化镓功率电子变换器电子技术

Microcosm study on fate and dynamics of mangrove tannins during leaf litter leaching

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Ecological Processes 2023年第1期12卷 520-533页

作者： Hai-Chao Zhou Hui-Xing Kang Jian Wei Chang-Jun Gao Muzammil Hussain Yi-Jian Fu Ming-Dang Li Feng-Lan Li Steven Jing-Liang Xu fred wang-Fat Lee Ming-Guo Jiang Yi-Bing wang Xiao-Xia Chen Nora Fung-Yee Tam Tao Lang Greater Bay Area Coastal Mangrove Wetland Research&Development Centre MNR Key Laboratory for Geo-Environmental Monitoring of Great Bay AreaCollege of Life Sciences and OceanographyShenzhen UniversityShenzhen 518060China Institute of Ecology College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of Ministry of EducationPeking UniversityBeijing 100091China Guangdong Provincial Key Laboratory of Silviculture Protection and UtilizationGuangdong Academy of ForestryGuangzhou 510520China School of Science and Technology The Hong Kong Metropolitan UniversityKowloonHong Kong 999077SARChina Guangxi Key Laboratory for Polysaccharide Materials and Modifications School of Marine Sciences and BiotechnologyGuangxi Minzu UniversityNanning 530008China State Key Laboratory of Marine Pollution City University of Hong KongKowloonHong Kong 999077SARChina

Background Mangrove tannins can participate in wetland biogeochemical ***,their fate and dynamics during leaf litter leaching have yet to be elucidated in coastal aquatic *** By using a simulated microcosm experiment,changes in leaf litter mass and tannin compounds,including total phenolics(TP),extractable condensed tannins(ECT),and bound condensed tannins(BCT),were examined in the litters and leachates of four common mangrove species:Kandelia obovata(Ko),Aegiceras corniculatum(Ac),Sonneratia apetala(Sa),and Avicennia marina(Am).Results Leaching caused a notable decline in litter mass,TP,and ECT in the leaf litter of Ko,Ac,Sa,and Am,while BCT increased significantly in Ko and *** in foliar TP was higher than in leaf litter mass,and loss in foliar ECT was higher than in TP of Ko and Ac,but Sa showed the opposite *** temporal changes of TP and ECT concentrations in leachates followed a similar trend,with an initial increase followed by a *** dynamics in Ko and Ac leachates correlated with their TP concentrations,while in Sa leachate,the peak ECT occurred 72 h later than its TP *** leachate ECT concentrations were highest in Ac,followed by Ko,and significantly lower in *** peak TP and ECT proportions in leachates accounted for 9.2-23.9%and 7.7-9.4%of the total decreases in foliar TP and ECT,*** During the leaching process,tannins’fate was species-specific,while the dynamics were almost similar.

关键词： Mangrove tannins Leaf litter decomposition Leaching Total phenolics Condensed tannins

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Modeling neuropsychiatric disorders using human induced pluripotent stem cells

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Protein & Cell 2020年第1期11卷 45-59页

作者： Meiyan wang Lei Zhang fred H.Gage Laboratory of Genetics The Salk Institute for Biological Studies10010 N.Torrey Pines RdLa JollaCA 92037USA Neurobiology Section Division of Biological SciencesUniversity of California San DiegoLa JollaCA 92093USA

Neuropsychiatric disorders are complex disorders characterized by heterogeneous genetic variations,variable symptoms,and widespread changes in anatomical *** the context of neuropsychiatric disorders,limited access to relevant tissue types presents challenges for understanding disease etiology and developing effective *** pluripotent stem cells(iPSCs)reprogrammed from patient somatic cells offer an opportunity to recapitulate disease development in relevant cell types,and they provide novel approaches for understanding disease mechanisms and for development of effective *** we review recent progress and challenges in differentiation paradigms for generating disease-relevant cells and recent studies of neuropsychiatric disorders using human pluripotent stem cell(hPSC)models where cellular phenotypes linked to disease have been *** use of iPSC-based disease models holds great promise for understanding disease mechanisms and supporting discovery of effective treatments.

关键词： neuropsychiatric disorders iPSCs brain organoid schizophrenia autism spectrum disorder bipolar disorder

Recent developments of the stoichiometric displacement model for separation processes

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Chinese Science Bulletin 2001年第21期46卷 1763-1772页

作者： GENG Xindu fred E.Regnier wang Yan Institute of Modern Separation Science Northwest Universitythe Key Lab of Modern Separation Science of Shaanxi ProvinceXi’an 710069China Department of Chemistry Purdue UniversityWest LafayetteIN 4 7907USA

Substantial attention has been paid to the stoi-chiometric displacement models for solute retention (SDM-R) in liquid chromatography and adsorption (SDM-A) at surfaces since they were developed. The SDM has a strongly theoretical basis and has evolved to the point that it is widely applied in chemistry, biochemistry, molecular biology and biotechnology. This review introduces the history, recent developments, and new concepts relating to the SDM, including theory, mathematical expressions, and applications across a broad range of fields.

关键词： liquid chromatography liquid-solid system stoichiomet- ric displacement retention model adsorption mechanism protein folding.

^(40)Ar/^(39)Ar ages of seamount trachytes from the South China Sea and implications for the evolution of the northwestern sub-basin

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Geoscience Frontiers 2015年第4期6卷 571-577页

作者： Xiaohu Li Jiabiao Li Xing Yu Chunsheng wang fred Jourdan Key Laboratory of Submarine Geoscience State Oceanic Administration Second Institution of Oceanography State Oceanic Administration Key Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration Western Australian Argon Isotope Facility Department of Applied Geology and Jd L Centre Curtin University

A chronological study of seamount rocks in the South China Sea basin provides a great opportunity to understand the expansion and evolution history of the sea basin. In this paper, we analyzed the ^40Ar/^39Ar age of trachytic samples collected from the Shuangfeng seamounts in the northwestern sub-basin of the South China Sea. The two samples yielded plateau ages of 23.80 ± 0.18 and 23.29 ± 0.22 Ma, respectively, which indicate magmatic activity in late Oligocene which helpful constraints the expansion time of the northwest sub-basin. Previous studies suggested that the northwestern sub-basin and southwestern sub-basin have experienced a relatively consistent expansion in the NW-SE direction followed by a late expansion of the eastern sub-basin. We concluded that the expansion of the northwestern sub-basin began prior to ca. 24 Ma, which also implicated magmatic events of a late or stop expansion of the northwestern sub-basin combined with our results of^40Ar/^39Ar age data and previous geophysical data.

关键词： ^40Ar/^39Ar datingSeamount trachyteNorthwest sub-basinExpansion historySouth China Sea

PHOTODYNAMIC THERAPY—AN UPDATE ON CLINICAL APPLICATIONS

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Journal of Innovative Optical Health Sciences 2009年第1期2卷 73-92页

作者： ZHENG HUANG LIBO LI HONGWEI wang XIULI wang KAIHUA YUAN ARLEN MEYERS LIHAO YANG fred W.HETZEL School of Medicine University of Colorado Denver Aurora CO 80045USA Nanfang Hospital Southern Medical University Guangzhou China Shanghai Skin and STD Hospital Shanghai China Liuhuaqiao Hospital Guangzhou China Department of Molecular Cellularand Developmental Biology University of Colorado at Boulder BoulderCO 80309USA

Photodynamic therapy(PDT)has received increased attention since the regulatory approvals of several photosensitizers and light applicators in numerous countries and regions around the *** recent years,much progress has been seen in basic research as well as clinical *** clinical application has now extended from treating malignant diseases to nonmalignant *** review article will present recent clinical data published in English *** data will be organized according to their clinical *** new development and future direction in clinical applications of PDT for the management of both malignant and nonmalignant diseases will be discussed.

关键词： Photodynamic therapy clinical application malignant disease non-malignant disease