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（2＋1）-Dimensional Electron Acoustic Solitary Waves in an Unmagnetized Collisionless Plasma with Vortex-Like Hot Electrons

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Communications in Theoretical Physics 2007年第2期47卷 339-342页

作者： LIN Mai-Mai duan wen-shan Department of Physics Northwest Normal University Lanzhou 730070 China

In this paper, （2＋1）-dimensional electron acoustic waves （EAW） in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique, respectively. The dispersion relation and a modified Kadomtsev-Petviashvili （KP） equation have been obtained for the EAW in the plasma considering a cold electron fluid and a vortex-like hot electrons. It is found from some numerical results that the parameter β（the ratio of the free hot electron temperature to the hot trapped electron temperature） effects on the amplitude and the Width of the electron acoustic solitary waves （EASW）. It can be indicated that the free hot electron temperature and the hot trapped electron temperature have very important effect on the characters of the propagation for the EASW.

关键词： electron acoustic solitary wave vortex-like hot electrons reductive perturbation method

Anti-synchronization in Different Hyperchaotic Systems

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Communications in Theoretical Physics 2008年第10期50卷 907-912页

作者： DOU Fu-Quan SUN Jian-An duan wen-shan College of Physics and Electronics Engineering Northwest Normal University Lanzhou 730070 China

Based on active control theory, anti-synchronization between two different hyperchaotic systems is investigated. The sufficient conditions for achieving anti-synchronization of two different hyperchaotic systems are derived. Moreover, numerical simulations are presented for hyperehaotic Lorenz-Chen system, hyperchaotic Lorenz-Lu system, and hyperchaotic Chen Lu system to verify the effectiveness and feasibility of the proposed anti-synchronization scheme.

关键词： anti-synchronization hyperchaotic system active control

Korteweg de Vries Description of One-Dimensional Superfluid Fermi Gases

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Chinese Physics Letters 2011年第12期28卷 199-202页

作者： XU Yan-Xia duan wen-shan College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070

We study one-dimensional matter-wave pulses in cigar-shaped superfluid Fermi gases,including the linear and nonlinear waves of the system.A Korteweg de Vries(KdV)solitary wave is obtained for the superfluid Fermi gases in the limited case of a BEC regime,a BCS regime and *** dependences of the propagation velocity,amplitude and the width of the solitary wave on the dimensionless interaction parameter y=1/(kF asc)are given for the limited cases of BEC and unitarity.

关键词： Fermi gases solitary

Compressive and Rarefactive Waves in Dust Plasma with Non-thermal Ions

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Communications in Theoretical Physics 2006年第6期45卷 1112-1116页

作者： duan wen-shan WANG Hong-Yan John Parkes Department of Physics Northwest Normal University Lanzhou 730070 China Department of Mathematics University of Strathclyde Glasgow G1 1XHUK

The governing equation of the dust fluid with non-thermal ions and variable dust charge on dust particles in hot dust plasmas is obtained. Both the compressive and rarefactive waves in this system are investigated. They can be determined by plasma parameters including the temperatures of （lust fluid, ions and electrons, as well as the non-thermal parameter of ions, and the number densities of the dust particles, the ions and the electrons, etc.

关键词： compressive wave rarefactive wave soliton

Nonlinear Waves in a Cigar-Shaped Bose-Einstein Condensate with Dissipation

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Communications in Theoretical Physics 2008年第1期49卷 119-122页

作者： YANG Xiao-Xian SHI Yu-Ren duan wen-shan College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

We discuss the possible nonlinear waves of atomic matter waves in a cigar-shaped Bose-Einstein condensatewith dissipation. The waves can be described by a KdV-type equation. The KdV-type equation has a solitary wave solution. The amplitude, speed, and width of the wave vary exponentially with time t. The dissipative term of ~/ plays an important role for the wave amplitude, speed, and width. Comparisons have been given between the analytical solutions and the numerical results. It is shown that both are in good agreement.

关键词： Bose Einstein condensate GP equation KdV-type equation

Existing Regions of Either Rarefactive or Compressive Solitary Waves for Particular Dusty Plasma

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Communications in Theoretical Physics 2008年第2期49卷 482-484页

作者： GAO Xiu-Yun LIN Mai-Mai duan wen-shan College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

By deriving a Korteweg-de Vries （KdV） equation for particular dusty plasma, we find the existing regions of solitary waves. The regions of both rarefactive and compressive solitary waves have also been given in this... 详细信息

关键词： dust acoustic solitary waves KdV equation

New Periodic Wave Solutions, Localized Excitations and Their Interaction Properties for （3＋1）-Dimensional Jimbo-Miwa Equation

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Communications in Theoretical Physics 2007年第4X期48卷 584-590页

作者： DOU Fu-Quan SUN Jian-An duan wen-shan LU Ke-Pu College of Physics and Electronics Engineering Northwest Normal University Lanzhou 730070 China

Based on the multi-linear variable separation approach, a class of exact, doubly periodic wave solutions for the （3＋1）-dimensional Jimbo-Miwa equation is analytically obtained by choosing the Jacobi elliptic functions and their combinations. Limit cases are considered and some new solitary structures （new dromions） are derived. The interaction properties of periodic waves are numerically studied and found to be inelastic. Under long wave limit, two sets of new solution structures （dromions） are given. The interaction properties of these solutions reveal that some of them are completely elastic and some are inelastic.

关键词： Jimbo-Miwa equation Jacobi elliptic function periodic solutions dromions

Instability of Waves in Magnetized Vortex-Like Ion Distribution Dusty Plasmas

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Communications in Theoretical Physics 2007年第1期47卷 149-154页

作者： duan wen-shan CHEN Jian-Hong HONG Xue-Ren WAN Gui-Xin Department of Physics Northwest Normal University Lanzhou 730070 China

A modified Zakharov-Kuznetsov equation for small but finite dustic waces in a magnetized votex-like ion distribution dusty plasma is obtained in this *** seems that there are instability for a soliton under higher-order transverse perturbations in this system. There is a certain critical value 4λ0. If the ratio of the wave length of the higher-order perturbations to the width of the soliton is larger than this critical value, the solitary wave is unstable, otherwise it is stable.

关键词： equationdust size distribution soliton modified Zakharov-Kuznetsov

Hot Dust Acoustic Solitary Waves in Dust Plasma with Variable Dust Charge

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Chinese Physics Letters 2001年第8期18卷 1088-1089页

作者： duan wen-shan LÜ Ke-Pu ZHAO Jin-Bao Department of Physics Northwest Normal UniversityLanzhou 730070

Considering the variation of dust charges,We have analytically studied the governing equation for the system with the same model as that for cold dust acoustic waves in a demagnetized plasma but the contribution of hot *** result indicates that the governing equation is also a Korteweg-de Vries equaiton,although its amplitude and width will be smaller compared with the cold dust case.

关键词： equation governing charges