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High Voltage 2024年第2期9卷 275-286页

作者： yi Luo Shiyi Mao Ju Tang Zijun pan Cheng pan State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityWuhanChina

The surface charge accumulation on the basin insulator is a particular problem in high-voltage direct current(HVDC)gas insulated switchgears(GIS)and gas insulated trans-mission lines(GIL),which restricts the development and application of extra/ultra high-voltage(EHV/UHV)*** surface charge distribution and anti-flashover performance are closely related to the insulator *** obtain the optimal basin insulator,a shape optimisation model based on artificial bee colony algorithm was established,and the minimisation objective functions based on capacitive(initial)electric field distribution and resistive(steady-state)electric field distribution were respectively *** optimisation results of the two objective functions were calculated,and the electric field and charge distribution on the surface of the insulator before and after optimisation were evaluated and compared using the simulation *** results indicated that the optimisation based on the capacitive electric field can significantly inhibit the surface charge accumulation,and the optimised insulator can significantly reduce the surface normal electric field and make the distribution of the tangential electric field more uniform,and the maximum tangential electric field can be reduced by 10%;the optimisation based on resistive electric field can achieve similar results,but requires more computational *** on the results,the‘anti-charge’basin insulator structure suitable for the DC field was given.

关键词： insulator artificial charge

Contrasting the Skills and Biases of Deterministic Predictions for the Two Types of El Nio

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Advances in Atmospheric Sciences 2017年第12期34卷 1395-1403页

作者： fei ZHENG Jin-yi YU International Center for Climate and Environment Science Institute of Atmospheric PhysicsChinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Department of Earth System Science University of California

The tropical Pacific has begun to experience a new type of El Nio, which has occurred particularly frequently during the last decade, referred to as the central Pacific(CP) El Nio. Various coupled models with different degrees of complexity have been used to make real-time El Nio predictions, but high uncertainty still exists in their forecasts. It remains unknown as to how much of this uncertainty is specifically related to the new CP-type El Nio and how much is common to both this type and the conventional Eastern Pacific(EP)-type El Nio. In this study, the deterministic performance of an El Nio–Southern Oscillation(ENSO) ensemble prediction system is examined for the two types of El Nio. Ensemble hindcasts are run for the nine EP El Nio events and twelve CP El Nio events that have occurred since 1950. The results show that(1) the skill scores for the EP events are significantly better than those for the CP events, at all lead times;(2) the systematic forecast biases come mostly from the prediction of the CP events; and(3) the systematic error is characterized by an overly warm eastern Pacific during the spring season, indicating a stronger spring prediction barrier for the CP El Nio. Further improvements to coupled atmosphere–ocean models in terms of CP El Nio prediction should be recognized as a key and high-priority task for the climate prediction community.

关键词： ENSO EP El Nio CP El Nio prediction skill systematic bias spring prediction barrier

Enhancing cycle stability of Li metal anode by using polymer separators coated with Ti-containing solid electrolytes

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Rare Metals 2021年第6期40卷 1357-1365页

作者： Zhao Yan Hong-yi pan Jun-Yang Wang Ru-Song Chen Quan Li fei Luo Xi-Qian Yu Hong Li Beijing Advanced Innovation Center for Materials Genome Engineering Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Tianmulake Excellent Anode Materials Co. Ltd.Liyang 213300China Yangtze River Delta Physics Research Center Co. Ltd.Liyang 213300China

The employment of lithium metal anode in rechargeable lithium batteries has been hindered by the safety concerns which are associated with the uncontrolled lithium dendrite growth and the unceasing side reactions with liquid *** this work,we report that the use of Ti-containing solid electrolyte-coated separators can greatly enhance the cycle performances of lithium metal anode in cells using liquid *** detailed morphologic studies indicate that more uniform lithium deposition is achieved in cells using Ti-containing solid electrolyte-coated separators than that using Al_(2)O_(3)-coated separators,which is likely due to the modified anode and electrolyte interfacial properties induced by the reactive nature of Ti-containing solid electrolytes with metallic *** work demonstrates an effective strategy to enhance the homogeneity of lithium deposition,which leads to the stable cycling of lithium metal anode in rechargeable lithium-ion batteries.

关键词： Lithium metal anode Lithium batteries Solid electrolyte Separator

Conductivity of carbon-based molecular junctions from ab-initio methods

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Frontiers of physics 2014年第6期9卷 748-759页

作者： Xiao-fei Li yi Luo School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China KTH Royal Institute of Technology School of Biotechnology Division of Theoretical Chemistry and Biology S-106 91 Stockholm Sweden

Carbon nanomaterials （CNMs） are prompting candidates tor next generational electronics. In this review we provide a mini overview of recent results on the conductivity of carbon-based molecular junctions obtained from ab-mitio methods. CNMs used as nanoelectrodes and molecular materials in molecular junctions are discussed. The flmctionalities that include the nanomechanically controlled molecular conductance switches, negative differential resistance devices, and electronic rectifiers realized by using CNMs have been demonstrated.

关键词： carbon nanotubes graphene all-carbon nanodevice quantum transport ab-initio molecular dynamics simulations

Dynamics of surface charge and electric field distributions on basin-type insulator in GIS/GIL due to voltage polarity reversal

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High Voltage 2020年第2期5卷 151-159页

作者： yi Luo Ju Tang Cheng pan Zijun pan yi Li Zhaolun Cui School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072People's Republic of China

In this study,a simulation model of surface charge accumulation has been *** model considers three accumulation ways,*** conduction within the gas,through insulator volume and along the insulator *** generation,diffusion,drift and recombination of charge carriers are also taken into *** on it,the influence of polarity reversal,reversal time on surface charge and electric field distribution on a basin-type insulator are *** polarity of the surface charges and the direction of the electric field change after the voltage polarity *** the preload voltage is equal to reversal voltage,the surface charge and the electric field distributions at steady state before and after voltage polarity reversal are all the same with opposite sign,and not affected by the reversal ***,the time to reach the steady state varies with different reversal *** steady-state surface charge and electric field increased with the rise of reversal *** transient normal and tangential electric field would not exceed the value of the steady state,which means voltage polarity reversal has no additional influence on insulation *** research can provide guidance to the design and manufacture of DC GIS/GIL.

关键词： charge insulator polarity

High-performance On-chip Micro-supercapacitors(MSCs)with Three-dimensional(3D)Nanostructures

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材料导报 2020年第12期34卷 12003-12004页

作者： WANG yi LI fei ZHANG Yuxin College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Material Systems for Nanoelectronics Chemnitz University of TechnologyChemnitz 09107Germany

In recent years,the attractive concept of smart life has undoub-tedly provided opportunities for the development of micro-supercapacitors(MSCs).Among the current energy-storage devices used in integrated microelectronics applications,despite micro-batte-ries endow a stable current supply or deliver a high peak current,micro-supercapacitors(MSCs)still hold several intrinsic advantages such as superior power densities,longer operating lifetime(>100000 cycles),faster charge/discharge rates,wide working temperature range as well as desirable safety properties[1-3].Because of the limited area available for integrating components into small scale systems,areal performance properties(capacity,power and energy per footprint area)are more significant indicators than volumetric or gravimetric performance.

关键词： performance attractive integrating

Density functional theory study of structural stability for gas hydrate

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Chinese Physics B 2018年第4期27卷 272-275页

作者： Ping Guo yi-Long Qiu Long-Long Li Qiang Luo Jian-fei Zhao yi-Kun pan State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China

Using the first-principles method based on the density functional theory（DFT）,the structures and electronic properties of different gas hydrates（CO2,CO,CH4,and H2） are investigated within the generalized gradient *** structural stability of methane hydrate is studied in this *** results show that the carbon dioxide hydrate is more stable than the other three gas hydrates and its binding energy is-2.36 e V,and that the hydrogen hydrate is less stable and the binding energy is-0.36 e *** cages experience repulsion from inner gas molecules,which makes the hydrate structure more *** the electronic properties of two kinds of water cages,the energy region of the hydrate with methane is low and the peak is close to the left,indicating that the existence of methane increases the stability of the hydrate *** the methane molecule in water cages and a single methane molecule,the energy of electron distribution area of the former is low,showing that the filling of methane enhances the stability of hydrate structure.

关键词： first principles gas hydrate binding energy stability

Archaeal community structure in sediments from a seamount in the Mariana Volcanic Arc

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Journal of Oceanology and Limnology 2019年第4期37卷 1197-1210页

作者： ZHANG Wenyan LIU Jia DONG yi LI Xuegang XU Cong XIAO Tian pan Hongmiao WU Long-fei Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms (LIA-MagMC) CNRS-CAS Marseille-Beijing-Qingdao-Sanya Aix Marseille Univ CNRS LCB Marseille 31 chemin Joseph Aiguier F-13402 France Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao 266071 China

Seamounts are subsurface mountains in the ocean. Examination of the abundance and distribution of Archaea in seamount ecosystems may provide a better understanding of their ecological functions. Most studies of marine archaeal assemblages in seamount area have focused on hydrothermal vents or ferromanganese crusts. We investigated the archaeal communities from a seamount of the Mariana Volcanic Arc, in the tropical western Pacific Ocean by using high-throughput sequencing. Thaumarchaeota was dominant in the sediments of all sample stations. Community diversity and species richness were greatest at stations near the top of the seamount, and lowest at the deepest station. One sample station on the steep southeast slope that faced the Yap-Mariana trench had a unique composition of Archaea. In summary, depth has an important influence on archaeal community structure, and the geographic properties and sediment characteristics may explain the unique distribution patterns of Archaea in this seamount. This study provides a foundation for future research on Archaea in seamounts.

关键词： seamount archaeal diversity community structure Nitrosopumilales

On the Boundedness of Rough Oscillatory Singular Integrals on Triebel-Lizorkin Spaces

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1881-1898页

作者： Leslie CHENG yi Biao pan Department of Mathematics Bryn Mawr College Bryn Mawr PA 19010 USA Department of Mathematics University of Pittsburgh Pittsburgh~ PA 15260 USA

We obtain appropriate sharp bounds on Triebel-Lizorkin spaces for rough oscillatory inte- grals with polynomial phase. By using these bounds and using an extrapolation argument we obtain some new and previously known ... 详细信息

关键词： Oscillatory singular integral rough kernel Orlicz spaces Block spaces extrapolation Triebel-Lizorkin spaces

Life science progress and andrology development

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Asian Journal of Andrology 2010年第2期12卷 133-135页

作者： yi-fei Wang Editor-in-Chief of Asian Journal of Andrology 294 Tai-Yuan Road Shanghai 200031 China

As requested by many participants, I would like to share with you the opening remark, which I made at the Third Asia-Pacific Forum on Andrology, in conjunction with the Celebration of the Tenth Anniversary of Asian Journal of Andrology, Nanjing, China, October 10, 2009. In my opening remark, I raised three questions about the development of Andrology, as well as highlighted three major trends of current progress of life science, which might be of great help in setting up our strategy for Andrology development in the coming years.

关键词： Life science progress andrology development