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Research on the discrete variational method for a Birkhoffian system

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Chinese physics B 2014年第6期23卷 328-332页

作者：刘世兴花巍郭永新 college of physics Liaoning University college of physics and Technology Shenyang Normal University

In this paper, we present a new integration algorithm based on the discrete Pfaff-Birkhoff principle for Birkhoffian systems. It is proved that the new algorithm can preserve the general symplectic geometric structures of Birkhoffian systems. A numerical experiment for a damping oscillator system is conducted. The result shows that the new algorithm can better simulate the energy dissipation than the R-K method, which illustrates that we can numerically solve the dynamical equations by the discrete variational method in a Birkhoffian framework for the systems with a general symplectic structure. Furthermore, it is demonstrated that the results of the numerical experiments are determined not by the constructing methods of Birkhoffian functions but by whether the numerical method can preserve the inherent nature of the dynamical system.

关键词： Birkhoff's equations discrete variational methods general symplectic structure discrete Birkhoff's equations

Alpha-Chain States in 4N-Nuclei

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Chinese journal of nuclear physics 1997年第2期19卷 99-102页

作者： Xie Wenfang Chen Chuanyu Department of physics,Guangzhou Teachers’ college,Guangzhou 510400 广州师范学院物理系广东广州 510400 广州师范学院物理系广东广州

Alpha-chain states in 4N-nuclei are studied via an analysis of underlying quantummechanical *** candidates for linear chain states in N alpha particles arepointed out.

关键词： Alpha-chain states 4N-nuclei Quantum mechanical symmetry

Analysis of Fourier Transforming System Contained Revolution Nonsymmetric Optical Elements by Using Ray Matrix Methods

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光电子.激光 1989年第2期 113-115页

作者： Xie Xian-Wen(Department of Mathematics and physics,Zhejiang Educational college)

Ray matrix methods are used to study a paraxial Fourier transforming system which contains nonsymmetric optical elements. Two equalization conditions of Fourier transform are drived: matrix elements criteria and lens law, which may be used to distinguish a Fourier system and to determine Fourier trams-forming plane, Computing formulas for Fraunhofer diffraction region, Fourier transforming region and physical focus-depth region are *** image formation is given. As applying examples, two nonsymmetric systems are studied.

关键词： Analysis of Fourier Transforming System Contained Revolution Nonsymmetric Optical Elements by Using Ray Matrix Methods

From the Green's Function in Tight-Binding Representation to Interatomic Many-body Potentials

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Journal of Materials Science & Technology 1999年第4期15卷 315-319页

作者： Shaojun LIU(Department of physics, Beijing Normal University, Beijing 100875, China)Xiaobo WEI(Department of physics, Liuzhou college of Education, Liuzhou 545005, China)Zhaodou CHEN Jun CAI and Benkun MA(Department of physics, Beijing Normal University, Department of physics Beijing Normal University Beijing 100875 China Department of physics Liuzhou College of Education Liuzhou 545005 China

In this paper, we deduce the analytical form of many-body interatomic potentials based on the Green's function in tight-binding representation. The many-body potentials are expressed as the functions of the hopping integrals which are the physical origin of cohesion of atoms. For thesimple case of s-valent system, the inversion of the many-body potentials are discussed in detail by using the lattice inversion method.

关键词： Rev Li Chen From the Green’s Function in Tight-Binding Representation to Interatomic Many-body Potentials body

Research progress in the study of atmospheric pressure glow barrier discharge

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Progress in Natural Science:Materials International 2007年第3期17卷 247-253页

作者： LI Xuechen, DONG Lifang and JIA Pengying (college of physics Science and Technology, Hebei University, Baoding 071002, China) college of physics Science and Technology Hebei University Baoding 071002 China

Atmospheric pressure glow barrier discharge (APGBD) can operate at high pressure, and so vacuum device is not necessary. Furthermore, the produced plasma by APGBD has moderate electron temperature and density besides good uniformity. Therefore, APGBD has extensive potential applications in industry and has been becoming a hot issue in the research of low temperature plasma. In this paper, the main problems in the study of atmospheric pressure glow discharge generated by dielectric barrier discharge, including the experimental setup, judging criterion, discharging conditions, physical mechanisms, and parameter diagnoses, are discussed, and further research prospects of APGBD are proposed.

关键词： atmospheric pressure glow discharge dielectric barrier discharge low temperature plasma.

Study on (2+1)-Dimensional Nizhnik-Novikov-Veselov Equation by Using Extended Mapping Approach

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Communications in Theoretical physics 2006年第7期46卷 10-14页

作者： XU Chang-Zhi and HE Bao-Gang Department of physics, Jinhua Education college, Jinhua 321000, China Department of physics Jinhua Education College Jinhua 321000 China

Extended mapping approach is introduced to solve (2+1)-dimensional Nizhnik-Novikov-Veselov equation. A new type of variable separation solutions is derived with arbitrary functions in the model. Based on this excitation, rich localized structures such as multi-lump soliton and ring soliton are revealed by selecting the arbitrary function appropriately.

关键词： extended mapping approach (2+1)-dimensional Nizhnik-Novikov-Veselov equation new localized excitation

Controlled Quantum N-Party Simultaneous Direct Communication

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Communications in Theoretical physics 2007年第7期48卷 79-82页

作者： XIA Yun-Jie MAN Zhong-Xiao college of physics and Engineering,Qufu Normal University,Qufu 273165,China college of physics and Engineering Qufu Normal University Qufu 273165 China

In this paper,we propose a controlled quantum N-party simultaneous direct communication protocolwith single-qubit *** users can simultaneously exchange their secret messages in a set of devices withthe control of a **... 详细信息

关键词： direct communication N-party simultaneous

Lattice dynamical simulation of methane hydrate

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Journal of Natural Gas Chemistry 2010年第1期19卷 43-46页

作者： Lin Wang, Shunle Dong physics Department, college of Information Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, China physics Department College of Information Science and Engineering Ocean University of China Qingdao 266100 Shandong China

INS （Inelastic Neutron Scattering） spectrum of methane hydrate was measured on MARI （a direct-geometry chopper spectrometer） at Ruther-ford Appleton Laboratory, UK. Compared with ice Ih, it is found that the whole spectrum of methane hydrate moves toward high-energy by about 1.5 meV. Using lattice dynamical （LD） technique, computer simulations of methane hydrate were carried out. In the simulations, four potential models （BE TIP3P, TIP4P, MCY） were employed to calculate the phonon density of states （PDOS）. Comparing the calculated PDOS spectrum with the experimental spectrum, it is found that BF, TIP4P, and TIP3P potential lattices give out well-separated translational and librational bands while MCY potential lattice is unstable to do so and this model is not suitable to describe hydrate system.

关键词： methane hydrate inelastic neutron scattering lattice dynamical simulation

Chaos correlation optical time domain reflectometry

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Science China(Information Sciences) 2010年第2期53卷 398-404页

作者： WANG AnBang & WANG YunCai Department of physics, college of Science, Taiyuan University of Technology, Taiyuan 030024, China Department of physics College of Science Taiyuan University of Technology Taiyuan China

We propose a novel correlation optical time domain reflectometry (C-OTDR) of using broadband chaotic light. This reflectometry has the advantage over the conventional OTDR and the pseudorandom signal C-OTDR in range-independent spatial resolution. We employ a laser diode with feedback from a long fiber ring cavity as the source of chaotic probe light. Experimental and numerical studies show that the chaotic light has broad and flat spectrum, and excellent correlation properties. Using this broadband chaotic laser, we experimentally demonstrate the proposed chaos C-OTDR for locating the fiber reflection events, and analyze the spatial resolution and dynamic range. The results show that the chaos C-OTDR can realize a range-independent resolution of 6 cm and its dynamic range is at least 25 km.

关键词： optical time domain reflectometry chaos laser diode optical feedback