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The Ruin Probability of the Renewal Model with Constant Interest Force and Upper-tailed Independent Heavy-tailed Claims

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Acta Mathematica Sinica,English Series 2010年第9期26卷 1815-1826页

作者： Xin mei SHEN Zheng yan LIN Department of Mathematics Zhejiang University Hangzhou 310027 P. R. China

In this paper, we obtain the uniform estimate for discounted aggregate claims in the continuous-time renewal model of upper-tailed independent and heavy-tailed random variables. With constant interest force and constant premium rate, we establish a uniform simple asymptotic formula for ruin probability of the renewal model in the case where the initial surplus is large.

关键词： Asymptotic estimate consistent variation renewal process upper-tail independent

Behavior of High Strength Concrete Filled Square Steel Tube Stub Columns with Inner CFRP Tube Under Biaxial Eccentric Compression

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Computer Modeling in Engineering & Sciences 2021年第4期127卷 273-290页

作者： Zhijian yang Guochang Li yan lang Zengmei Qiu School of Civil Engineering Shenyang Jianzhu UniversityShenyang110168China Department of Building Engineering Suqian CollegeSuqian223800China

This paper studies the contribution of CFRP(carbon fiber-reinforced polymer)to the mechanical behavior of high strength concrete-filled square steel tube(HCFST)under biaxial eccentric *** new type of composite member is composed of an inner CFRP tube and an outer steel tube with concrete filled in the two *** finite element analysis was made by ABAQUS on the behavior of high strength concrete filled square steel tubular columns with inner CFRP circular tube subjected to bi-axial eccentric *** results obtained from the finite element analysis were verified with the experimental *** addition,the load-deflection curves in the whole process were calculated and analyzed,which can be divided into three segments:Elastic phase,plastic phase,descending *** on the load-deflection curves,the stresses analysis on the core concrete,CFRP tube and steel tube were *** confinement effect of the CFRP tube improves the ductility of HCFST-CFRP stub *** ratio and eccentricity affect the ultimate bearing capacity of HCFST stub ***,a calculation formula of ultimate bearing capacity was proposed in the paper.

关键词： CFRP tube concrete-filled square steel tube high strength concrete bi-axial bending stub column

Nanomechanical behaviors of (110) and (111) CdZnTe crystals investigated by nanoindentation

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Rare Metals 2009年第6期28卷 570-575页

作者： LI yan KANG Renke GAO Hang WANG Jinghe lang yanjua Key Laboratory of the Ministry of Education of China for Precision and Nan-Traditional Machining Technology Dalian University of Technology Dalian 116024 China Precision Engineering Research Institute Harbin Institute of Technology Harbin 150001 China

The nanomechanical behaviors of （110） and （111 ） CdZnTe crystals were investigated by nanoindentation. It was found that the indenter tip was adhered by the removed materials in scanning testing area although the scanning force on the tested surface was very small （1000 nN）, which would affect the testing result of nanoindentation, so the indenter was clean before nanoindentation test. The experimemtal results showed that the hardness and Young＇s modulus decreased with the increase of indentation loads on the same plane. Because of the anisotropy of the CdZnTe crystal, the average hardness of （110） plane is 35% lower than that of （111） plane, and there are about 30% difference of the hardness along different crystallographic directions on the same plane. The hardness in 0° and 120° testing directions was the same due to the threefold symmetry of a Berkovich indenter. And the anisotropy affected the surface quality during machining of CdZnTe crystal.

关键词： nanomechanics anisotropy nanoindentation CdZnTe

Synthesis and Crystal Structure of a Copper(II) Complex with a Tab-Tab Disulfide Ligand (Tab-Tab)[CuBr_4](Tab=Trimethylammoniumphenyl-4-thiolate)

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Chinese Journal of Structural Chemistry 2006年第9期25卷 1100-1104页

作者： TANG Xiao-yan CHEN Jin-Xiang lang Jian-Ping School of Chemistry and Chemical Engineering Suzhou University Jiangsu 215123 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

Reaction of CuBr2 with TabHPF6/Et3N in methanol followed by dissolving the resulting precipitate in hydrobromic acid yielded purple blocks of the title complex [Tab-Tab][CuBr4] 1 （C18H26CuBraN2S2）. 1 crystallizes in the monoclinic system, space group P2 1/n with a = 9.686（3）, b = 19.257（5）, c = 13.399（4） ,A, β= 93.610（9）°, V= 2494.2（13） ,A^3, Z= 4, Dc = 1.911 g/cm^3, T= 193（2） K, Mr = 717.71, F（000） = 1396,μ = 74.58 cm^-1, S = 1.126, R = 0.0748 and wR = 0.1736 for 2921 observed reflections with 1 〉 2σ（I）. The structure of 1 contains a discrete [CuBr4]^2- dianion and a [Tab-Tab]^2＋ dication. In the dianion, the Cu atom is coordinated to four Br atoms forming a distorted tetrahedral coordination geometry. The bromides of the dianion interact with the H atoms of the phenyl and methyl groups of the dications to form a 1D hydrogen-bonded chain.

关键词： tetrabromocuprate(Ⅱ) disulphide synthesis crystal structure

Orientation selectivity in cat primary visual cortex: local and global measurement

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Neuroscience Bulletin 2015年第5期31卷 561-571页

作者： Tao Xu Hong-mei yan Xue-mei Song Ming Li Key Laboratory for Neuroinformation of Ministry of Education University of Electronic Science and Technology of China Shanghai Institutes of Biological Sciences Chinese Academy of Sciences The Department of Automatic Control College of Mechatronics and Automation National University of Defense Technology

In this study,we investigated orientation selectivity in cat primary visual cortex（V1） and its relationship with various *** found a strong correlation between circular variance（CV） and orthogonal-topreferred response ratio（O/P ratio）,and a moderate correlation between tuning width and O/P ***,the suppression far from the peak that accounted for the lower CV in cat V1 cells also contributed to the narrowing of the tuning width of *** also studied the dependence of orientation selectivity on the modulation ratio for each cell,which is consistent with robust entrainment of the neuronal response to the phase of the drifting grating *** conclusion,the CV（global measure） and tuning width（local measure） are significantly correlated with the modulation ratio.

关键词： cat orientation selectivity tuning width circular variance primary visual cortex

Remote preparation for single-photon state in two degrees of freedom with hyper-entangled states

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Frontiers of physics 2021年第4期16卷 65-73页

作者： mei-Yu Wang Fengli yan Ting Gao College of Physics Hebei Normal UniversityShijiazhuang 050024China School of Mathematics Science Hebei Normal UniversityShijiazhuang 050024China Hebei Key Laboratory of Photophysics Research and Application Shijiazhuang 050024China

Remote state preparation(RSP)provides a useful way of transferring quantum information between two distant nodes based on the previously shared *** this paper,we study RSP of an arbitrary single-photon state in two degrees of freedom(DoFs).Using hyper-entanglement as a shared resource,our first goal is to remotely prepare the single-photon state in polarization and frequency DoFs and the second one is to reconstruct the single-photon state in polarization and time-bin *** the RSP process,the sender will rotate the quantum state in each DoF of the photon according to the knowledge of the state to be *** performing a projective measurement on the polarization of the sender’s photon,the original single-photon state in two DoFs can be remotely reconstructed at the receiver’s quantum *** work demonstrates a novel capability for longdistance quantum communication.

关键词： remote state preparation hyper-entanglement

Polyoxometalate-based ionic liquids-promoted CO_2 conversion

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Science China Chemistry 2016年第5期59卷 507-516页

作者： mei-yan Wang Ran Ma Liang-Nian He State Key Laboratory and Institute of Elemento-Organic Chemistry Collaborative Innovation Center of Chemical Science and Engineering Nankai University

Polyoxometalates(POMs) are a class of molecular metal oxides, showing numerous applications in various chemical processes due to their unique acid/base and redox features. By adjusting the tunable molecular structures of the anions and counter cations, plenty of POM-based ionic liquids(POM-based ILs) have been fabricated to be used in various fields, such as catalysis, structural chemistry and material science. As a class of excellent catalysts, POM-based ILs have shown advantages in the emerging field of CO_2 utilization such as CO_2 capture, cycloaddition of CO_2 to epoxides, and reduction of CO_2, owing to the efficient activation of CO_2 by POM anions. This review summarizes recent advances in the catalysis of POM-based ILs, and particularly highlights the areas that are related to CO_2 conversion.

关键词： ionic liquid catalysis CO2 conversion polyoxometalate

Mg doping and native N vacancy effect on electronic and transport properties of AlN nanowires

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Science China(Technological Sciences) 2015年第5期58卷 832-841页

作者： QIN mei SHANG yan WANG Xiao ZHANG GuiLing Innovative Research Team of Green Chemical Technology in University of Heilongjiang Province College of Chemical and Environmental Engineering Harbin University of Science and Technology

The effects of Mg doping(MgAl) and native N vacancy(VN) on the electronic structures and transport properties of Al N nanowire(Al NNW) were theoretically investigated by using density functional theory. Either the MgAl defect or the VN defect prefers to be formed on the Al NNW surfaces. Both MgAl and VN defects could increase the conductivity owing to introducing a defect band inside the band gap of Al N and split the Al N band gap into two subgaps. The defect concentration has little influence on the magnitude of the subgaps. The MgAl serves as a shallow acceptor rendering the nanowire a p-type conductor. The VN introduces a deep donor state enabling the nanowire an n-type conductor. The MgAl systems exhibit higher conductivity than the VN ones owing to the narrow subgaps of MgAl systems. The conductivity is roughly proportional to the defect concentration in the MgAl and VN defect systems. When the MgAl and VN coexist, the hole state of the MgAl defect and the electron state of the VN defect will compensate each other and their coupling state appears just above the valence-band maximum leading to a little decrease of the band gap compared with the pure Al NNW, which is unfavorable for the enhancing of the conductivity.

关键词： doping enabling rendering compensate introducing valence magnitude defects narrow nanotubes

Projected Climate Change against Natural Internal Variability over China

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Atmospheric and Oceanic Science Letters 2015年第4期8卷 193-200页

作者： JIANG Jiang SUI Yue lang Xian-mei Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology

The ability of 42 Coupled Model Intercomparison Project Phase 5(CMIP5) models in simulating the annual and seasonal temperature and precipitation over China is first examined by using their historical experiments for 1986–2005, and then 39 relatively reliable models are chosen to project temperature and precipitation changes against the natural internal variability over the country under the Representative Concentration Pathways(RCP) scenarios in the 21 st century. The result shows the temperature continuing to increase, especially in northern China. The annual warming for 2081–2099 relative to 1986–2005 over the whole of the country is larger than the background variability, with the multimodel median changes under RCP2.6, RCP4.5, RCP6.0, and RCP8.5 being 9.9, 19.3, 22.8, and 35.9 times greater than one standard deviation of internal variability, respectively. The annual precipitation is projected to increase by 6.1%, 9.3%, 9.6%, and 16.2% for 2081–2099 relative to 1986–2005 under RCP2.6, RCP4.5, RCP6.0, and RCP8.5 respectively, while large changes with high model agreement only occur over the northern Tibetan Plateau and Northeast China, which is mainly due to the robust changes in winter and spring under RCP6.0 and RCP8.5.

关键词： temperature precipitation internal variability China CMIP5