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Propagation of liquid surface waves over finite graphene structured arrays of cylinders

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theoretical & Applied Mechanics Letters 2011年第5期1卷 73-76页

作者： Xuemei Liu,1,2 Yong Wei,1 Sheng Li,1 Yousheng Xu,1,Detang Lu,3.and Boming Yu 4 1) Department of physics,Zhejiang Normal University,Jinhua 3.1004,Zhejiang,china 2) Hangzhou No.14 Middle School,Hangzhou 3.0006,china 3. Department of Modern Mechanics,University of Science and Technology of{3.,Hefei 23.027,china 4) School of physics,Huazhong University of Science and Technology,Wuahn 43.074,china School of physics Huazhong University of Science and Technology Wuahn 430074 China

Based on the multiple scattering method,this paper investigates a benchmark problem of the propagation of liquid surface waves over finite graphene (or honeycomb) structured arrays of *** the graphene structured array with the square structured and with triangle structured arrays,it finds that the finite graphene structure can produce more complete band gaps than the other finite structures,and the finite graphene structure has less localized ability than the other finite structures.

关键词： propagation liquid surface wave graphene structured array multiple scattering method

Relations Between Characteristic Function,Positive P-Representation and Coherent Thermal State

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Communications in theoretical physics 2007年第7期48卷 67-70页

作者： FAN Hong-Yi XU Xing-Lei Department of Material Science and Engineering,University of Science and Technology of china,Hefei 23.026,china2 Department of physics,Shanghai Jiao Tong University,Shanghai 20003.,china3.Department of physics,Heze University,Heze 274015,china Department of Material Science and Engineering University of Science and Technology of China Department of physics Shanghai Jiao Tong University Department of physics Heze University

We employ the coherent thermal states(a kind of entangled states)in thermal field dynamics to establisha complete entangled state formalism expressing pseudo-classical representations of density operator for light ***,the relationship between the coherent thermal state and the characteristic function and the positive Prepresentation in quantum optics theory are obtained.

关键词： coherent thermal state characteristic function positive P-representation

Analytical Potential Energy Function,Spectroscopic Constants and Vibrational Levels for A^1E_u^+ State of Dimer ~7Li_2

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Communications in theoretical physics 2007年第12期48卷 1081-1087页

作者： SHI De-Heng~1 MA Heng~1 SUN Jin-Feng~(1,2)and ZHU Zun-Lue~1~1 College of physics & Information Engineering,henan Normal University,Xinxiang 453.07,china~2 Department of physics & Electron Science,Luoyang Normal University,Luoyang 471022,china College of physics & Information Engineering Henan Normal University Xinxiang 453007 China Department of physics & Electron Science Luoyang Normal University Luoyang 471022 China

The symmetry-adapted-duster configuration-interaction method is used to investigate the spectroscopicproperties of ~7Li_2(A^1∑_u^+) over the internuclear distance ranging from 2.4ao to *** complete potential energycurves are calculated at numbers of basis *** the ab initio calculated points are fitted to the analytic MurrellSorbie function and then employed to compute the spectroscopic *** comparison,the spectroscopic constantsreproduced by the potential attained at D95(3.f,3.d) are found to be very close to the experiments,a^d the values (T_e,D_e,R_e,ω_e,ω_eχ_e,α_e and B_e) are of 1.73. 93.eV,1.161 3. eV,0.3.3.27 nm,251.95 cm^(-1),1.623.cm^(-1),0.005 3. cm^(-1),and0.490 cm^(-1),*** the potential obtained at D95(3.f,3.d),the totally 75 vibrational states are found whenJ=*** vibrational levels,the classical turning points and the inertial rotation constants of the first 68 vibrationalstates are calculated for the first time and compared with the available *** agreement is *** centrifugal distortion constants of the first 3. vibrational states are also reported for the first *** reasonabledissociation limit for ~7Li_2(A^1∑_u^+) is deduced using the calculated results at present.

关键词： analytic potential energy function harmonic frequency dissociation energy vibrational level classical turning point

DFT study of the conductance of molecular wire:The effect of coupling geometry and intermolecular interaction on the transport properties

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Science china Chemistry 2006年第6期49卷 492-498页

作者： QI Yuanhua1,2, GUAN Daren1 & LIU Chengbu1 1. Institute of theoretical Chemistry, Shandong University, Jinan 250100, china 2. School of physics and Microelectronics, Shandong University, Jinan 250061, china 1. Institute of theoretical Chemistry Shandong University Jinan 250100 China 2. School of physics and Microelectronics Shandong University Jinan 250061 China

The density functional theory (DFT) combining with the non-equilibrium Green functions (NEGF) method is applied to the study of the electronic transport properties for a Di-thiol-benzene (DTB) molecule coupled to two Au(111) surfaces. The dependence of the transport properties on the bias, the coupling geometry of the molecule-electrode interface, and the intermolecular interaction are examined in detail. The results show that the existence of the hydrogen atom at the end of the DTB molecule would significantly decrease the transmission coefficients, and then the differential conductance (dI/dV). By changing the position of the DTB molecule located between two electrodes a maximum value of calculated current is observed. It is also found that the intermolecular interaction will strongly influence the transport properties of the system studied.

关键词： non-equilibrium Green functions method, transmission spectrum, the molecular projected selfconsistent Hamiltonian, projected density of state.

Symbolic Computation Study of (2+1)-Dimensional Dispersive Long Wave Equations

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Communications in theoretical physics 2006年第8期46卷 199-202页

作者： LU Zhuo-Sheng~(1,2,+) and XIE Fu-Ding~(2,3. ~1School of Science, Beijing University of Post and Telecommunications, Beijing 100876, china ~2Key Laboratory of Mathematics Mechanization, Academy of Mathematics and System Sciences, the Chinese Academy of Sciences, Beijing 100080, china ~3.epartment of Computer Science, Liaoning Normal University, Dalian 116029, china Department of Otolaryngology University Hospital VU P.O. Box 7057 1007 MB Amsterdam The Netherlands School of Science Beijing University of Post and Telecommunications Beijing 100876 China

Seeking exact analytical solutions of nonlinear evolution equations is of fundamental importance in mathematical physics. In this paper, based on a constructive algorithm and symbolic computation, abundant new exact solutions of the (2+1)-dimensional dispersive long wave equations are obtained, among which there are soliton-like solutions, mult-soliton-like solutions and formal periodic solutions, etc. Certain special solutions are considered and some interesting localized structures are revealed.

关键词： dispersive long wave equations symbolic computation exact solution localized structure

Special relativity and theory of gravity via maximum symmetry and localization

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Science china Mathematics 2008年第4期51卷 568-603页

作者： GUO HanYing Institute of theoretical physics Chinese Academy of Sciences Beijing 100080 china 1. Institute of theoretical physics Chinese Academy of Sciences Beijing 100080 China

Like Euclid, Riemann and Lobachevski geometries are on an almost equal footing, based on the principle of relativity of maximum symmetry proposed by Professor Lu Qikeng and the postulate on invariant universal constants c and R, the de Sitter/anti-de Sitter (dS/AdS) special relativity on dS/AdS-space with radius R can be set up on an almost equal footing with Einstein’s special relativity on the Minkowski-space in the case of R→∞.Thus the dS-space is coin-like: a law of inertia in Beltrami atlas with Beltrami time simultaneity for the principle of relativity on one side, and the proper-time simultaneity and a Robertson-Walker-like dS-space with entropy and an accelerated expanding S 3.fitting the cosmological principle on another side.If our universe is asymptotic to the Robertson-Walker-like dS-space of R ? (3.Λ)1/2, it should be slightly closed in O(Λ) with entropy bound S ? 3.c 3.k B /ΛG?. Contrarily, via its asymptotic behavior, it can fix on Beltrami inertial frames without ‘an argument in a circle’ and acts as the origin of inertia.There is a triality of conformal extensions of three kinds of special relativity and their null physics on the projective boundary of a 5-d AdS-space, a null cone modulo projective equivalence [ $ \mathcal{N} $ ] ? ? P (AdS 5). Thus there should be a dS-space on the boundary of S 5 × AdS 5 as a vacuum of supergravity.In the light of Einstein’s ‘Galilean regions’, gravity should be based on the localized principle of relativity of full maximum symmetry with a gauge-like dynamics. Thus, this may lead to the theory of gravity of corresponding local symmetry. A simple model of dS-gravity characterized by a dimensionless constant g ?(ΛG?/3. 3.1/2 ～ 10?61 shows the features on umbilical manifolds of local dS-invariance. Some gravitational effects out of general relativity may play a role as dark matter.The dark universe and its asymptotic behavior may already indicate that the dS special relativity and dS-gravity be the foundati

关键词： special relativity de Sitter invariance gravity local de Sitter invariance umbilical manifold 83.05 83.05 53.3. 53.50

Cyclic Heating-Annealing and Boltzmann Distribution of Free Energies in a Spin-Glass System

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Communications in theoretical physics 2007年第7期48卷 179-182页

作者： ZHOU Hai-Jun Institute of theoretical physics,the Chinese Academy of Sciences,Beijing 100080,china Institute of theoretical physics the Chinese Academy of Sciences Beijing 100080 China

Ergodicity of a spin-glass is broken at low temperatures;the system is trapped in one of many ergodicconfigurational *** between different ergodic domains are achievable through a *** this experiment is repeated infinite times,all ergodic configurational domains will be visited with frequencesthat decreasing exponentially with their free *** mean free energy density of a spin-glass system on a randomgraph is calculated based on this free energy Boltzmann distribution in the present work,by means of the cavity approach.

关键词： spin-glass ergodicity-broken cavity method

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一种空时体积与引力的激发和跃迁生成模式

物理学报 2011年第12期60卷 44-48页

作者：邵丹邵亮邵常贵江汉大学光电信息研究所武汉430056 武汉科技大学应用物理系武汉430081 湖北第二师范学院理论物理研究所武汉430205

利用4单形及其对偶1-骨架,描述了纯空时的跃迁.对自旋网编织成的三维空间在跃迁的两个台阶间体积的改变做出了证明.给出了四维空时体积的一个平坦量子涨落模型.利用自旋网腿中的圈线刺过曲面时产生的激发,获得了三维空间的2阶对称离散张... 详细信息

利用4单形及其对偶1-骨架,描述了纯空时的跃迁.对自旋网编织成的三维空间在跃迁的两个台阶间体积的改变做出了证明.给出了四维空时体积的一个平坦量子涨落模型.利用自旋网腿中的圈线刺过曲面时产生的激发,获得了三维空间的2阶对称离散张量hab,按照空时是激发和跃迁体系的观点,得到了离散引力场hμν的产生与改变机制.

关键词：体积量子膨胀空时度规涨落引力扰动的激发 2阶对称张量的产生

Acoustic impedance characteristics of linear compressors

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Journal of Zhejiang University-Science A(Applied physics & Engineering) 2013年第7期14卷 494-503页

作者： Zhi-hua GAN Long-yi WANG Sheng-ying ZHAO Yu-jing SONG Wei-wei WANG Yi-nong WU Institute of Cryogenics and Refrigeration Zhejiang University School of Information and Electrical Engineering Zhejiang University City College Shanghai Institute of Technical physics Chinese Academy of Sciences

The acoustic field of a linear compressor serves to deliver the compression work to the load, such as the connected cold head of a cryocooler; it plays an equivalently important role as the electrical and mechanical parts, especially in the impedance match issue. This paper studies the acoustic impedance characteristics of a linear compressor. The parameters including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, the pressure-volumetric (PV) power delivered, and the efficiency are theoretically and experimentally investigated. Different from previous theoretical studies, optimization for the operations away from the resonance is also included. More general optimization results imply relevance between thermoacoustic engines and linear compressors. The predicted results are validated by the experiments performed on a linear compressor with an adjustable resistive-capacitive (RC) acoustic load. The comparisons between the calculations and the measurements are presented and analyzed. The results provide deeper insight into the mechanism of the linear compressor and the impedance match in a cryocooler system.

关键词： Linear compressor Acoustic impedance Resistive-capacitive (RC) load