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The complex variable reproducing kernel particle method for elasto-plasticity problems

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Science China(physics,Mechanics & Astronomy) 2010年第5期53卷 954-965页

作者： CHEN Li1 & CHENG YuMin2.1 Department of Engineering Mechanics,Chang’an university,Xi’an 710064,China 2.shanghai Institute of Applied Mathematics and Mechanics,shanghai university,shanghai 2.0072.China 1. Department of Engineering Mechanics Chang’an University Xi’an 710064 China2. Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

On the basis of reproducing kernel particle method(RKPM),using complex variable theory,the complex variable reproducing kernel particle method(CVRKPM) is discussed in this *** advantage of the CVRKPM is that the correction function of a two-dimensional problem is formed with one-dimensional basis function when the shape function is *** the CVRKPM is applied to solve two-dimensional elasto-plasticity *** Galerkin weak form is employed to obtain the discretized system equation,the penalty method is used to apply the essential boundary *** then,the CVRKPM for two-dimensional elasto-plasticity problems is formed,the corresponding formulae are obtained,and the Newton-Raphson method is used in the numerical *** numerical examples are given to show that this method in this paper is effective for elasto-plasticity analysis.

关键词： meshless method reproducing kernel particle method(RKPM) complex variable reproducing kernel particle method(CVRKPM) correction function elasto-plasticity

Quantum statistical entropy corresponding to cosmic horizon in five-dimensional spacetime

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Science China(physics,Mechanics & Astronomy) 2008年第2期51卷 140-146页

作者： ZHAO Ren1,2.& ZHANG ShengLi1 1 Department of Applied physics, Xi’an Jiaotong university, Xi’an 710049, China 2.Department of physics, Shanxi Datong university, Datong 037009, China Department of Applied physics Xi’an Jiaotong University Xi’an 710049 China Department of physics Shanxi Datong University Datong 037009 China

The generalized uncertainty relation is introduced to calculate the quantum statis-tical entropy corresponding to cosmic horizon. By using the new equation of state density motivated by the generalized uncertainty relation, we discuss entropies of Bose field and Fermi field on the background of five-dimensional spacetime. In our calculation, we need not introduce cutoff. There is no divergent logarithmic term in the original brick-wall method. And it is obtained that the quantum statistical en-tropy corresponding to cosmic horizon is proportional to the area of the horizon. Further it is shown that the entropy corresponding to cosmic horizon is the entropy of quantum state on the surface of horizon. The black hole's entropy is the intrinsic property of the black hole. The entropy is a quantum effect. In our calculation, by using the quantum statistical method, we obtain the partition function of Bose field and Fermi field on the background of five-dimensional spacetime. We provide a way to study the quantum statistical entropy corresponding to cosmic horizon in the higher-dimensional spacetime.

关键词： quantum statistical entropy generalized uncertainty relation high-dimensional spacetime

HMO in geometrical optics

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Chinese Journal of Lasers 1994年第4期B3卷 347-350页

作者： GUO Hong LIN Tao WANG Gang ZHANG Yuansheng DENG Ximing (1. Nafional laboratory on High Power Laser and physics,{2. Institute of Optics & Fine Mechanics,P. O. Box 800-2.1,{2. 2.1800,China)(2. Department of physics, university of Science & Technol shanghai Inst of Optics and Fine Mechanics Acad Sinica Shanghai China

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关键词： geometrical optics hydrodynamical model of optics nonlinear medium

Density functional theory study on the structural and electronic properties of Ag-adsorbed (MgO)_n clusters

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Science China(physics,Mechanics & Astronomy) 2009年第5期52卷 734-741页

作者： GE GuiXian1, JING Qun1 & LUO YouHua2.3 1 Key laboratory of Ecophysics and Department of physics, Normal College, Shihezi university, Shihezi 832.03, China 2.School of Science, East China university of Science and Technology, shanghai 2.02.7, China 3 Institute for Theoretical physics, Henan university, Kaifeng 475004, China Key laboratory of Ecophysics and Department of physics Normal College Shihezi University Shihezi 832003 China School of Science East China University of Science and Technology Shanghai 200237 China Institute for Theoretical physics Henan University Kaifeng 475004 China

Equilibrium geometries, charge distributions, stabilities and electronic properties of the Ag-adsorbed (MgO)n (n = 1-8) clusters have been investigated by density functional theory (DFT) with generalized gradient approximation (GGA) for exchange-correlation functional. The results show that hollow site is energetically preferred for n≥4, and the incoming Ag atoms tend to cluster on the existing Ag cluster. The Mulliken populations indicate that the interaction between the Ag atom and Magnesia clusters is mainly induced by a weak atomic polarization. The adsorbed Ag atom only causes charge redistributions of the atoms near itself. The effect of the adsorbed Ag atom on the bonding natures and structural features of Magnesia clusters is minor. Furthermore, the investigations on the first energy difference, fragmentation energies and electron affinities show that the Ag(MgO)4 and Ag(MgO)6 are the most stable among studied clusters.

关键词： Ag (MgO)_n clusters geometries electronic properties

Optical, Mechanical and Laser-induced Damage Threshold Properties of 1064 nm, 532.nm Frequency-doubled Antireflection Coating for LBO

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Journal of Wuhan university of Technology(Materials Science) 2011年第4期26卷 687-689页

作者：谭天亚 Department of physics Liaoning University

1 064 nm, 532.nm frequency-doubled antireflection （AR） coatings with buffer layer of SiO2.between the coating and the substrate were fabricated by the electron beam evaporation technology on the substrate of lithium triborate （LiB3O5 or LBO） crystals. The residual reflectance of the sample is 0.07% and 0.11% at 1 064 nm and 532.nm, respectively. The adhesion and the laser-induced damage threshold （LIDT） of the sample are greater than 2.0 mN and 18.6 J/cm2. The strengthening mechanism of adhesion and LIDT of the buffer layer of SiO2.were discussed by considering full plastic indentation and shear theory, and spallation of a plated film induced by thermal shock stress, respectively.

关键词： frequency-doubled AR coating LBO adhesion LIDT buffer layer

A computational investigation of boron-doped chromium and chromium clusters by density functional theory

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Science China(physics,Mechanics & Astronomy) 2010年第5期53卷 812-817页

作者： GE GuiXian1,JING Qun1 & LUO YouHua2.3 1 Key laboratory of Ecophysics and Department of physics,Normal College,Shihezi university,Xinjiang 832.03,China 2.School of Science,East China university of Science and Technology,shanghai 2.02.7,China 3 Institute of Theoretical physics,School of physics and Information Optoelectronics,Henan university,Kaifeng 475004,China 1. Key laboratory of Ecophysics and Department of physics Normal College Shihezi University Xinjiang 832003 China2. School of Science East China University of Science and Technology Shanghai 200237 China3. Institute of Theoretical Physics School of Physics and Information Optoelectronics Henan University Kaifeng 475004 China

The geometries,stabilities and electronic properties of Crn and CrnB(n=2.9) clusters have been systematically investigated by density functional *** results suggest that the lowest energy structures for CrnB clusters can be obtained by substituting one Cr atom in Crn+1 clusters with B *** geometries of CrnB clusters are similar to that of Crn+1 clusters except for local structural *** second-order difference and fragmentation energy show Cr4,Cr6,Cr8,Cr3B,Cr5B and Cr8B cluster are the most stable among these studied *** impurity B increases the stabilities of chromium *** B is doped on the Crn clusters,cluster geometry does dominate positive role in enhancing their *** doped B atom does not change the coupling way of the Cr site in Crn clusters,but breaks the symmetry and the Cr atoms are no longer *** doped B atom increases the total magnetic moments of Crn in most cases.

关键词： Crn and CrnB clusters geometries electronic properties

Electrochemical Characterization of surface-modified LiMn_2._4 Cathode Materials for Li-ion Batteries

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Journal of Wuhan university of Technology(Materials Science) 2006年第4期21卷 56-59页

作者：禹筱元 College of Science South China Agricultural University Guangzhou 510642ChinaSchool of Physics & Engineering Sun Yat-sen University Guangzhou 510275China

To improve the performance, the surface of 12.n2.4 was coated with very fine MgO , Al2.3 and ZnO by solgel method, respectively. The structure and morphology of the coated materials were investigated by X-ray diffraction （ XRD ）, X-ray photoelectron spectroscopy （ XPS ） and scanning electron microscopy （SEM）. The charge and discharge performance of uncoated and surfnce modified 12.n2.4 spinel at 2.℃ and 55 ℃ were tested, using a voltage window of 3.0-4.35 V and a current deasity of 0. 1 C rate. There is a slight decrease in the initial discharge capacity relative to that of uncoated UMn2.O4, bat the cycle ability of 12.12.n2.4 coated by metal-oxide has remarkably been improved. The EIS measuremeuts of uncoated and Al2.3 -coated 12.n2.4 were carried out by a model 2.3 A potentiostatl galvanistat controUed by a computer using M2.0 software, and using a freqnency response analyzer （ Zsimpwin ） combined with a potentiostate （ PAR 2.3）. Coaseqnently, the reason for the improved cycle properties is that the surface modification reduces the dissolution of Mn , which results from the suppression of the electrolyte decomposition, and suppresses the formation of passivation film that acts as an electronic insulating layer. In conclusion, the use of surface modification is an effective way to improve the electrochemical performance of 12.n2.4 cathode material for lithium batteries.

关键词： lithium-ion batteries surface modification metal-oxide coating: 12.n2.4 cathode

Tunneling conductance in graphene ferromagnet/p wave superconductor junctions

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Science China(physics,Mechanics & Astronomy) 2012年第4期Mechanics & Astronomy) .卷 649-653页

作者： LI XiaoWei 1,2.,CHEN HuaBao 1 & LIU ShuJing 1 1 School of physics and Electronic Electrical Engineering,Huaiyin Normal university,Huaian 2.3300,China 2.State Key {2. of Functional Materials for Informatics,shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,shanghai 2.0050,China 1. School of physics and Electronic Electrical Engineering Huaiyin Normal University Huaian 223300 China2. State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Using the extended Blonder-Tinkham-Klapwijk formalism,we investigate the conductance spectra of graphene ferromagnet/p wave superconductor *** is found that the conductance spectra are affected by the p wave pairing *** ferromagnetic exchange energy in the ferromagnet can suppress Andreev retroreflection but enhance the specular Andreev reflection in graphene ferromagnet/p wave superconductor *** conductance decreases with increasing exchange energy Eh for EhEF.

关键词： graphene ferromagnet p wave superconductor tunneling conductance

Study on Stabilization of a Synchronously Pumped Dye Laser

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Chinese Journal of Lasers 1995年第3期B4卷 223-228页

作者： ZHU Heyuan SUN Diechi HU Yimei LI Fuming(State Key Joint laboratory for Material Modification by Laser,Ion and Electron beams, fudan BranchDept. of {2., fudan university, shanghai 2.0433, China) fudan Univ Shanghai China

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关键词： coherent photon seeding time-bandwidth product frequency hopping