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Highly active Fe_(7)S_(8) encapsulated in N-doped hollow carbon nanofibers for high-rate sodium-ion batteries

Journal of Energy Chemistry 2021年第2期30卷 26-35,I0002页

作者： Chengzhi Zhang donghai wei Fei Wang Guanhua Zhang Junfei Duan Fei Han Huigao Duan Jinshui Liu Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and EngineeringHunan UniversityChangsha 410082HunanChina State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082HunanChina School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410004HunanChina

Nanostructured iron sulfides are regarded as a potential anode material for sodium-ion batteries in virtue of the rich natural abundance and remarkable theoretical ***,poor rate performance and inferior cycling stability caused by sluggish kinetics and volume swelling represent two main obstacles at present. The previous research mainly focuses on nanostructure design and/or hybridizing with conductive *** boosting the property by adjusting Fe/S atomic ratio in iron sulfides is rarely *** this work,Fe_7 S_8 and FeS_2 encapsulated in N-doped hollow carbon fibers(NHCFs/Fe_7 S_8 and NHCFs/FeS_2) are constructed by a combined chemical bath deposition and subsequent sulfidation *** well-designed NHCFs/Fe_(7) S_(8) electrode displays a remarkable capacity of 517 mAh g^(-1) at 2 A g^(-1)after 1000 cycles and a superb rate capability with a capability of 444 mAh g^(-1) even at 20 A g^(-1) in etherbased ***,the rate capability of NHCFs/Fe_(7) S_(8) is superior to that of the contrast NHCFs/FeS_(2) electrode and also much better than the values of the most previously reported iron sulfide-based *** in-depth mechanism explanation is explained by further experimental analysis and theoretical calculation,revealing Fe_(7) S_(8) displays improved intrinsic electronic conductivity and faster Na^(+) diffusion coefficient as well as higher reaction reversibility.

关键词： Sodium-ion batteries Anode High rate Iron sulfides N-doped hollow carbon fibers

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“Three essential elements”of the primary health care system:A comparison between California in the US and Guangdong in China

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Family Medicine and Community Health 2015年第1期3卷 23-29页

作者： Minfang Huang donghai wei Louis Rubino Lianshen Wang Dazhuang Li Bofeng Ding Gan Li School of Health Management Guangzhou Medical UniversityGuangzhou 510182China California State University NorthridgeLos Angeles 91325USA

The primary health care system(PHCS)is the portal and basis for the national health delivery *** are a number of elements which comprise the PHCS,but the system cannot be established and developed without the support of“three essential elements,”including general practitioners(GPs),health insurance,and government health *** comparative analysis of the“three essential elements”of the PHCS between California in the US and Guangdong in China,this article indicates that there are three important aspects in developing a PHCS in China,as follows:training qualified GPs;establishing a diversified health insurance system to strengthen the policy connections between health insurance and the PHCS thereby increasing government health investment;and broadening health financing channels.

关键词： Primary health care system(PHCS) general practitioner(GP) health insurance government health investment California Guangdong

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Evolving governance during health care reform in the United States and China

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中国研究型医院 2014年第1期1卷 78-89页

作者： donghai wei Louis Rubino Robert Peterson Guangzhou Medical University Guangdong Provincial Health Economics Association California State University

Governance of public hospitals has become an important consideration in China. Research is being conducted, consultants are being engaged, and new models are being tested to determine how a change in governance can positively affect health care reform. The United States is looked to as an example for hospital governance. Old principles and new trends for boards of directors of hospitals are discussed. Critical thought is given as to the governance principles that can be applied in China which will augment the changes taking place to make hospitals more autonomous under health care reform. Recommendations are made by the authors as to which of these principles and new methods should be considered to be adopted for China's public hospitals.

关键词： Governance Board of Directors Fiduciary Responsibility Public Hospitals Strategic Direction

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Thermal characteristic evolution of lithium-ion batteries during the whole lifecycle

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Journal of Energy Chemistry 2024年第5期92卷 534-547页

作者： Guangxu Zhang Xuezhe wei donghai Chen Xueyuan Wang Siqi Chen Jiangong Zhu Haifeng Dai School of Materials Science and Engineering Tongji UniversityShanghai 201804China Clean Energy Automotive Engineering Center Tongji UniversityShanghai 201804China School of Automotive Studies Tongji UniversityShanghai 201804China

This work extensively investigates the thermal characteristic evolution of lithium-ion batteries under different degradation paths,and the evolution mechanism through multi-angle characterization is *** different degradation paths,the evolution trend of temperature rise rate remains unchanged with respect to depth of discharge during the adiabatic discharge process,albeit to varying degrees of *** temperature rise rate changes significantly with aging during the adiabatic discharge process under low-temperature cycling and high-rate cycling *** total heat generation rate,irreversible heat generation rate,and reversible heat generation rate exhibit similar evolution behavior with aging under different degradation *** interval range of endothermic process of reversible electrochemical reactions increases and the contribution of irreversible heat to the total heat increases with *** further standardize the assessment of different degradation paths on the thermal characteristics,this work introduces the innovative concept of“Ampere-hour temperature rise”.In low-temperature cycling and high-rate cycling paths,the ampere-hour temperature rise increases significantly with aging,particularly accentuated with higher discharge ***,in high-temperature cycling and high-temperature storage paths,the ampere-hour temperature rise remains relatively stable during the initial stages of aging,yet undergoes a notable increase in the later stages of *** multi-angle characterization reveals distinct thermal evolution behavior under different degradation paths primarily attributed to different behavior changes of severe side reactions,such as lithium *** findings provide crucial insights for the safe utilization and management of lithium–ion batteries throughout the whole lifecycle.

关键词： Lithium-ion batteries Adiabatic discharge Thermal characteristics Ampere-hour temperaturerise Degradation

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Electric-controlled tunable thermal switch based on Janus monolayer MoSSe

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npj Computational Materials 2022年第1期8卷 2483-2489页

作者： donghai wei E Zhou Xiong Zheng Huimin Wang Chen Shen Hongbin Zhang Zhenzhen Qin Guangzhao Qin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan University410082ChangshaP.R.China Hunan Key Laboratory for Micro-Nano Energy Materials&Device and School of Physics and Optoelectronics Xiangtan University411105XiangtanHunanChina Institute of Materials Science Technical University of DarmstadtAlarich-Weiss-Str.264287DarmstadtGermany School of Physics and Microelectronics Zhengzhou University450001ZhengzhouChina

The high-performance,wide-range tunable thermal switches play a significant role in the thermal management,high-power-density intelligent devices,energy systems,***,traditional thermal switch components,such as thermal diodes,suffer from poor stability,small adjustability,low time efficiency,and difficult ***,we propose the superior electric-controlled thermal switch(ECTS)based on Janus monolayer *** high-effective and asymmetric regulation of the thermal conductivity driven by electric field demonstrates a wide-range adjustable thermal switch ratio,where the peak value reaches 2.09 under the electric field of 0.04 VÅ^(−1).The underlying mechanism is revealed by electronic structures that the interactions between electrons and phonons are renormalized due to the electric field driving charge density redistribution,which ultimately modulates the phonon *** high-efficiency adjustable ECTS component is expected to provide new inspiration for next-generation thermal management and information processing.

关键词： tunable thermal switch

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美国卫生管理专业教员的多样性及给中国的建议(英文)

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中国研究型医院 2016年第1期3卷 14-21页

作者： Frankline Augustin Louis Rubino donghai wei California State University Guangzhou Medical University

Research hospitals/academic medical centers have a threefold mission of patient care, research and education. The meaning of education is to train students with both clinical and administrative personnel in order to better suit themselves in the health care industry. Health administration programs are proliferating in China and the United States due to the influence of their recent health reform movements. In China, health administration programs are staffed with faculty from clinical medicine and management, mostly from their university affi liated medical centers. However, health administration program faculty in the United States have a diverse set of industry backgrounds and bring an invaluable wealth of experience into the classroom. The authors provide a literature background on the often-followed paths that a person in the U.S. might take while pursuing a full time teaching career in higher education. A health administration faculty typology has been well developed, and concentrating on the following professional roles: a healthcare operator, an academic/educational administrator, a consultant, a clinician and a researcher. Thus, the authors discuss anecdotal data that they have collected on the perceived positives and negatives associated for each type. The authors conclude with providing recommendations to both Chinese and American programs to produce a more collegial and collaborative academic environment.

关键词： Comparative studies Practitioners Faculty Health administration Typology

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EMOTIONAL INTELLIGENCE AND ITS APPLICATION TO HOSPITAL ADMINISTRATION

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中国医院 2001年第7期 58-60页

作者： Brenda Freshman, Ph.D. Louis Rubino, Ph.D. , FACHE donghai wei Ph.D.

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Cold-Induced Reprogramming of Subcutaneous White Adipose Tissue Assessed by Single-Cell and Single-Nucleus RNA Sequencing

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Research 2024年第1期2023卷 763-778页

作者： Qing Liu Qiaoyun Long Jiayu Zhao Wenjie Wu Zexin Lin wei Sun Ping Gu Tuo Deng Kerry Martin Loomes donghai Wu Alice P.S.Kong Jingying Zhou Alfred S.Cheng Hannah Xiaoyan Hui School of Biomedical Sciences The Chinese University of Hong KongHong KongChina Department of Pharmacology and Pharmacy The University of Hong KongHong KongChina Guangzhou Institute of Biomedicine and Health Chinese Academy of SciencesGuangzhouChina China-New Zealand Joint Laboratory on Biomedicine and Health Chinese Academy of SciencesGuangzhouChina Department of Endocrinology Jinling HospitalNanjing UniversitySchool of MedicineNanjingChina National Clinical Research Center for Metabolic Diseases and Department of Metabolism and EndocrinologyThe Second Xiangya Hospital of Central South UniversityChangshaChina Key Laboratory of Diabetes Immunology Ministry of Educationand Metabolic Syndrome Research CenterThe Second Xiangya Hospital of Central South UniversityChangshaChina Clinical Immunology Center The Second Xiangya Hospital of Central South UniversityChangshaChina School of Biological Sciences and Maurice Wilkins Centre University of AucklandAucklandNew Zealand Department of Medicine and Therapeutics The Chinese University of Hong KongHong KongChina Hong Kong Institute of Diabetes and Obesity The Chinese University of Hong KongPrince of Wales HospitalShatinHong KongChina Li Ka Shing Institute of Health Sciences The Chinese University of Hong KongPrince of Wales HospitalShatinHong KongChina

Adipose browning has demonstrated therapeutic potentials in several ***,by conducting transcriptomic profiling at the single-cell and single-nucleus resolution,we reconstituted the cellular atlas in mouse inguinal subcutaneous white adipose tissue(iWAT)at thermoneutrality or chronic cold *** major nonimmune cells within the iWAT,including adipose stem and progenitor cells(ASPCs),mature adipocytes,endothelial cells,Schwann cells,and smooth muscle cells,were recovered,allowing us to uncover an overall and detailed blueprint for transcriptomes and intercellular cross-talks and the dynamics during white adipose tissue brown *** findings also unravel the existence of subpopulations in mature adipocytes,ASPCs,and endothelial cells,as well as new insights on their interconversion and reprogramming in response to *** adipocyte subpopulation competent of major histocompatibility complex class Ⅱ(MHCⅡ)antigen presentation is ***,a subcluster of ASPC with CD74 expression was identified as the precursor of this MHCⅡ^(+)*** adipocytes are transdifferented from preexisting lipid generating adipocytes,which exhibit developmental trajectory from de novo differentiation of amphiregulin cells(Aregs).Two distinct immune-like endothelial subpopulations are present in iWAT and are responsive to *** data reveal fundamental changes during cold-evoked adipose browning.

关键词： evoked programming generating

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基于VMD和SVD的柴油机气门间隙异常特征提取研究

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振动与冲击 2020年第16期39卷 23-30页

作者：江志农魏东海张进杰茆志伟北京化工大学高端机械装备健康监控与自愈化北京市重点实验室北京100029 北京化工大学发动机健康监控及网络化教育部重点实验室北京100029

为有效地从柴油机缸盖表面振动信号中提取气门间隙故障特征,提出一种基于变分模态分解(VMD)和奇异值分解(SVD)的特征提取新方法。采用VMD算法对缸盖振动信号进行分解,利用所得的模态分量构建特征矩阵;接着应用SVD理论将特征矩阵转变为... 详细信息

为有效地从柴油机缸盖表面振动信号中提取气门间隙故障特征,提出一种基于变分模态分解(VMD)和奇异值分解(SVD)的特征提取新方法。采用VMD算法对缸盖振动信号进行分解,利用所得的模态分量构建特征矩阵;接着应用SVD理论将特征矩阵转变为表征频率特性的奇异值序列,探讨了稳定工况下的奇异值序列与不同气门间隙状态之间的关系;由于转速、负荷等工况的改变对信号特征层的影响与故障所引起的信号特征的改变可能非常相似,因此将奇异值序列作为特征参数,输入到随机森林分类器中,构建分类模型,对柴油机变工况下的气门间隙故障进行诊断。实验结果表明:该方法能有效识别气门间隙故障,突出故障敏感特征;与传统基于Hankel矩阵和小波包系数矩阵的SVD特征提取方法相比,该方法所提特征参数在柴油机变工况条件下具有更高的识别率。

关键词：特征提取变分模态分解(VMD) 奇异值分解(SVD) 气门间隙故障

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HT200灰铁叶轮的精密铸造

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特种铸造及有色合金 2015年第2期35卷 174-175页

作者：赵竞翔李桐王拓卫东海郑州机械研究所铸造工程技术中心

重点介绍了采用中温蜡料、硅溶胶型壳、智能检测金属液质量生产HT200灰铁叶轮的精密铸造工艺。介绍了铸件生产的技术难点、生产条件、模具设计、制壳、熔炼及浇注工艺,成功批量生产出了高品质的产品。

关键词：叶轮硅溶胶型壳智能检测精密铸造

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