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Conservation and Density Wave Equations of Plasma in Presence of Intense Laser Field

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Chinese Physics Letters 1997年第2期14卷 113-116页

作者： LIU shi-bing chen shi-gang Graduate School China Academy of Engineering PhysicsBeijing 100088 Institute of Applied Physics and Computational Mathematics Beijing 100088

The pressure tensor,energy density,and conservation equations of plasma in an intense laser field are derived by using a nonequilibrium distribution *** results show that the effect of the intense laser field on the behavior of plasma cannot be *** an application,the adiabatic equation of state,electronic density wave equation,and relevant dispersion relation are obtained for the electrostatic wave behavior.A substitution relation of the conserwtion equations from weak to intense field limits are presented.

关键词： function. intense equation

Non-Gaussian Phase Screen Based on log-Poisson Distribution and Effect on Imaging

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Communications in Theoretical Physics 2009年第12期52卷 1093-1101页

作者： YUAN Guo-Yong chen shi-gang Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing 100088 China Department of Physics Hebei Normal University Shijiazhuang 05{）016 China Hebei Advanced Thin Films Laboratory Shijiazhuang 050016 China

Gaussian models without intermittency are extensively used in estimating the effect of turbulence,but italso brings some puzzles,for example the observed pulse shape that disagrees with the result of the standard theoryof interstellar *** the property of intermittency is inherent in turbulence,i.e.,all the quantities thatcharacterize it suffer from strong *** it is necessary to consider turbulent intermittency in many *** this paper we propose a non-Gaussian phase screen,which obeys log-Poisson statistics,and also offers the correspondingpoint spread function(PSF).These results describe that intermittency leads to the more extent and different directionaldistribution of *** analysis is made under the hypothesis of the phase difference satisfying log-Poissonstatistics,and the average point spread function,which accord qualitatively with the result of the above generated phasescreen,is derived.

关键词： turbulence intermittency log-Poisson distribution phase screen

High-Order Harmonic Generation in the Ionization Process

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Chinese Physics Letters 2000年第10期17卷 723-725页

作者： chen Jing chen shi-gang LIU Jie Institute of Theoretical Physics Chinese Academy of ScienceBeijing 100080 Institute of Applied Physics and Computational Mathematics P.O.Box 8009Beijing 100088

Based on the nonperturbative quantum electrodynamics scattering theory for multiphoton ionization developed recently,high-order harmonic generated in the ionization process is *** influence of the Coulomb potential is treated as a perturbation in the expansion of the transition *** is deduced that the harmonic photons are emitted in the resonant process during ionization and the width of the harmonic peaks is just the ionization rate of the atom.

关键词： matrix. harmonic ionization

Quantum Electrodynamic Perspective on Multiphoton Ionization

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Chinese Physics Letters 1999年第12期16卷 888-890页

作者： chen Jing chen shi-gang LIU Jie Institute of Applied Physics and Computational Mathematics Beijing 100088 Graduate School of China Academy of Engineering Physics P.O.Box 2101Beijing 100088

A fully quantum nonperturbative method is developed to describe multiphoton ionization in intense fields. It is shown that, treating the radiation field with quantum electrodynamic(QED) theory enables u s to obtain the above-threshold ionization energy distribution spectrum in analytical form firstly. Moreover, in addition to the well-known semiclassical theory, the framework presented here, derived from a QED perspective, provides a new picture of the multiphoton ionization.

关键词： dynamic quantum ionization

Floquet Eigenstate, Phase Space Distribution and Entropy in the Atomic Stabilization Dynamics

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Chinese Physics Letters 1997年第9期14卷 652-655页

作者： XIE Bai-song chen shi-gang Graduate School China Academy of Engineering PhysicsBejing 100088 Institute of Applied Physics and Computational Mathematics Bejing 100088

A simple numerical method is developed to calculate the Floquet eigenstate and the quasienergy;the quantum Wigner function and the Husimi function in phase space in the atomic stabilization dynamics have also been studied Within the Kramers-Henneberger reference *** characteristic Wehrl entropy is introduced and used to measure the spreading and ionization of those obtained Floquet eigenstate wave packets.

关键词： state stabilization function

Control of Unstable Periodic Orbit by Means of Projective Operator Method

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Chinese Physics Letters 1997年第7期14卷 499-502页

作者： LIU Zong-hua chen shi-gang Graduate School China Academy of Engineering PhysicsBeijing 100088 Department of Physics Guangxi UniversityNanning 530004 Institute of Applied Physics and Computational Mathematics Beijing 100088

We define the projective operators for controlling unstable periodic orbit(UPO),and project the eigenvectors of Jacobian matrix of a system in the direction of trajectory and in the direction perpendicular to the *** the two eigenvalues in the perpendicular direction are changed to negative ones by adjusting the controlling *** the control of UPO can be *** is also shown that the procedure is effective even in the presence of noise.

关键词： parameter. perpendicular controlling

Finding and Control of Unstable Periodic Orbit in Autonomous Differential System

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Chinese Physics Letters 1997年第2期14卷 85-88页

A new method used to control unstable periodic orbit is *** method can reduce the three-dimensional system into two-dimensional by considering an appropriate variable equation as free *** is also effective in the pres... 详细信息

关键词： equation. Periodic equation

Synchronization of Conservative Flow

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Chinese Physics Letters 1997年第11期14卷 816-819页

Two identical chaotic systems of conservative flow are shown to be synchronous by applying periodic pubes at a regular time *** idea is illustrated with a numerical *** is robust against external noise.

关键词： applying conservative chaotic

Cascade of Random Rotation and Scaling in a Shell Model Intermittent Turbulence

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Communications in Theoretical Physics 2006年第6X期46卷 1074-1080页

作者： SUN Peng chen shi-gang WANG Guang-Rui Graduate School of China Academy of Engineering Physics P.O. Box 2101 Beijing 100088 China Physics Department Anshan Normal College Anshan 1140057 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 (28) Beijing 100088 China

The time behaviors of intermittent turbulence in Gledzer-Ohkitani-Yamada model are investigated. Two kinds of orbits of each shell which is in the inertial range are discussed by portrait analysis in phase space. We find intermittent orbit parts wandering randomly and the directions of unstable quasi-periodic orbit parts of different shells form rotational, reversal and locked cascade of period three with shell number. We calculate the critical scaling of intermittent turbulence and the extended self-similarity of the two parts of orbit and point out that nonlinear scaling in inertial-range is decided by intermittent orbit parts.

关键词： intermittent orbit unstable quasi-periodic orbit critical scaling extended self-similarity (ESS)