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The Asymptotic Behavior of Chern-Simons Higgs Model on a Compact Riemann Surface with Boundary

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Acta Mathematica Sinica,English Series 2012年第1期28卷 145-170页

作者： Meng wang Department of Mathematics Zhejiang UniversityHangzhou 310027P.R.China

We study the self-dual Chern-Simons Higgs equation on a compact Riemann surface with the Neumann boundary condition. In the previous paper, we show that the Chern-Simons Higgs equation with parameter A 〉 0 has at least two solutions （uλ^-, uλ^2） for A sufficiently large, which satisfy that uλ^1 - -u0 almost everywhere as λ →∞, and that uλ^2 →-∞ almost everywhere as λ→∞, where u0 is a （negative） Green function on M. In this paper, we study the asymptotic behavior of the solutions as λ →∞, and prove that uλ^2 - uλ^2- converges to a solution of the Kazdan-Warner equation if the geodesic curvature of the boundary OM is negative, or the geodesic curvature is nonpositive and the Gauss curvature is negative where the geodesic curvature is zero.

关键词： Riemann surface,. Neumann condition Chern-Simons Higgs model Green function Kazdan-Warner equation

NEW SPECIES AND NEW RECORDS OF REDUVIIDAE FROM chiNA

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Zoological Systematics 1965年第2期 116-120页

作者： hsiao TSAI-YU Nankai University

The present paper deals with 13 species of chinese Reduviidae, eight belonging toEmesinae, four to Saicinae and one to Tribelocephalinae. Among them nine species aredescribed as new to science and four are recorded for the first time from this country. Asynoptic key to the chinese genera of subfamily Emesinae and one to the chinese speciesof the genus Polytoxus Spin. are given. The four new records are Emesopsis spicatus

关键词： length than NEW SPECIES AND NEW RECORDS OF REDUVIIDAE FROM chiNA

Long-term optical and radio variability analysis of BL Lacertae 2200+420

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Science china(Physics,Mechanics & Astronomy) 2014年第2期57卷 375-380页

作者： wang HongTao Faculty of Physics and Electronic Information LangFang Teacher's College

Based on the radio light curves in 22 GHz and 37 GHz from the Metsahovi monitoring program and the optical light curves in BVRI bands from previously published results and the"Whole Earth Blazar Telescope"(WEBT)archives,we analyze the time delay among 22 GHz,37 GHz and optical bands(B,V,R,I)of BL Lacertae by means of discrete correlation *** results suggest there exist strong correlation among 22 GHz,37 GHz and optical bands(B,V,R,I)with *** 37 GHz lags behind R band by 11 *** correlation of brightness and color index among BVRI bands,brightness and spectral index between 37GHz and 22 GHz are also *** results show a clear trend of bluer-when-brighter.

关键词： astronomy blazar galaxy: nuclei

Mechanism investigation of enhanced electrochemical H_(2)O_(2) production performance on oxygen-rich hollow porous carbon spheres

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Nano Research 2022年第5期15卷 4599-4605页

作者： Zhiping Deng Xiaolei wang Department of Chemical and Materials Engineering University of Alberta9211-116 Street NWEdmontonAlberta T6G 1H9Canada

Electrochemical oxygen reduction is a promising approach for the sustainable decentralized production of H_(2)O_(2),but its viable commercialization is hindered by the insufficient development of efficient ***,we demonstrate a promising carbon-based catalyst,consisting of oxygen-rich hollow mesoporous carbon spheres(HMCSs),for selective oxygen reduction to H_(2)O_(2).The as-prepared HMCS exhibits high onset potential(0.82 V)and half-wave potential(0.76 V),delivering a significant positive shift compared with its oxygen-scarce counterparts and commercial Vulcan ***,excellent H2O2 selectivity(above 95%)and electrochemical stability(7%attenuation after 10 h operation)make this material a state-of-the-art catalyst for electrochemical H_(2)O_(2) *** outstanding performance arises from a combination of several aspects,such as porous structure-facilitation of mass transport,large surface area,and proper distribution of oxygen-containing functional groups modification on the ***,the proposed oxygen reduction reaction(ORR)mechanism on HMCS surface reveals that-OH functional groups help promote the first electron transfer process while other oxygen modification facilitate the second electron transfer.

关键词： H_(2)O_(2)production oxygen reduction reaction hollow porous carbon spheres electrocatalysis oxygen functionalization

Artificial Hybrid Solid Electrolyte-Mediated Ca Metal for Ultradurable Room Temperature 5 V Calcium Batteries

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Energy & Environmental Materials 2023年第2期6卷 142-151页

作者： Huawei Song Chengxin wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-Sen(Zhongshan)UniversityGuangzhou 510275China

The anodic stability and reversibility of Ca metal electrodeposition/dissolution have always been hampered by surface passivation and anion corrosion,especially in F-based carbonate ester electrolytes at high device *** avoid direct Ca metal/electrolyte reactions,an artificial hybrid solid electrolyte layer(AHSEL),which is characteristic of sodium/calcium carbonate and calcium hydride nitride nanocrystals of size1400 h at a polarization shift of3.3 V),a large capacity of≈80 mAh g^(-1)at 200 mA g^(-1),and an ultralong lifespan≈5000 cycles.

关键词： artificial solid electrolyte calcium metal batteries depth analysis electrolyte interphases high voltage

Analysis of crack initiation location and its influencing factors of fretting fatigue in aluminum alloy components

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chinese Journal of Aeronautics 2022年第6期35卷 420-436页

作者： Jian wang Caizhi ZHOU School of Civil Engineering and Architecture Southwest University of Science and TechnologyMianyang 621010China Shock and Vibration of Engineering Materials and Structures Key Laboratory'of Sichuan Province Southwest University of Science and TechnologyMianyang 621010China Department of Mechanical Engineering University of South CarolinaColumbia 29208United States

To promote the development of fretting fatigue assessment and control technology for aircraft components,this paper uses the Crystal Plasticity Finite Element(CPFE)method and sub-modeling technology to study the Crack Initiation Location(CIL)of fretting fatigue in Aluminum Alloy(AA)*** effects of external excitations such as normal load,tangential load,and axial stress on the CIL are *** is found that the Most Likely Cracked(MLC)site revealed in a specimen and the CIL may always be consistent after a limited number of cyclic loadings,and they are both located at the hotspot on the contact surface or in the *** MLC site may also migrate from the hotspot on the contact surface to the hotspot in the subsurface with an increase of the cyclic number,and finally transform into a *** relationship between the MLC site and the CIL of fretting fatigue and its influencing factors have also been described,as well as the identification method of the CIL of fretting fatigue,which provide theoretical and technical supports for anti-fretting fatigue design of AA components in service.

关键词： Crack nucleation Crystal plasticity Equivalent plastic strain Fretting fatigue Hotspot

Effects of layer number and initial pressure on continuum-based buckling analysis of multi-walled carbon nanotubes accounting for van der Waals interaction

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Applied Mathematics and Mechanics(English Edition) 2022年第12期43卷 1857-1872页

作者： Xinlei LI Jianfei wang Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

The structural instability of multi-walled carbon nanotubes(MWCNTs) has captured extensive attention due to the unique characteristic of extremely thin hollow cylinder structure. The previous studies usually focus on the buckling behavior without considering the effects of the wall number and initial pressure. In this paper, the axial buckling behavior of MWCNTs with the length-to-outermost radius ratio less than 20 is investigated within the framework of the Donnell shell theory. The governing equations for the infinitesimal buckling of MWCNTs are established, accounting for the van der Waals(vd W) interaction between layers. The effects of the wall number, initial pressure prior to buckling, and aspect ratio on the critical buckling mode, buckling load, and buckling strain are discussed, respectively. Specially, the four-walled and twenty-walled CNTs are studied in detail, indicating the fact that the buckling instability may occur in other layers besides the outermost layer. The obtained results extend the buckling analysis of the continuum-based model, and provide theoretical support for the application of CNTs.

关键词： multi-walled carbon nanotubes(MWCNTs) buckling load cylindrical shell model instability region buckling mode

Edge choosability of planar graphs without short cycles

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Science china Mathematics 2005年第11期48卷 1531-1544页

作者： wang Weifan School of Mathematics and Physics Zhejiang Normal University Jinhua 321004 China

In this paper we prove that if G is a planar graph with △= 5 and without 4-cycles or 6-cycles, then G is edge-6-choosable. This consequence together with known results show that, for each fixed k ∈{3,4,5,6}, a k-cyc... 详细信息

关键词： planar graph,coloring,choosability,cycle

Desorption-diffusion model and lost gas quantity estimation of coalbed methane from coal core under drilling fluid medium

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Science china Earth Sciences 2010年第4期53卷 626-632页

作者： Geoff wang School of Engineering University of Queensland

The differences of coalbed methane(CBM) desorption-diffusion from coal drilling-core under various drilling fluid medium are not considered in the present calculating methods of lost CBM quantity,which leads possibly to the inaccuracy of CBM quantity in coal *** we took the desorption of CBM from coal core under drilling fluid medium as a pressure-swing process,and based on the Langmuir equation and Fick-first law,established the desorption-diffusion model and numerical modeling method of lost gas(including free CBM) calculation in coal core under various drilling fluid mediums through physical simulation test and by considering comprehensively primary *** results showed that the physical simulated t-Qt curves can be rightly fitted by the numerical modeling data,which indicated the ultimate desorption quantity from the numerical modeling was adjacent to that from the physical simulation as a *** was found that the lost CBM quantity from the modeling method was generally higher than that from the direct method when lost time was relatively ***,we sug-gest that it is necessary to emend the active china national standard through further investigation,since the lost CBM quantity from coal drilling-core was generally underestimated using the method in the current standard.

关键词： drilling fluid CBM lost gas quantity desorption-diffusion model numerical modeling method