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The Prolongation Structure of a Coupled Kdv Equation

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Acta Mathematicae Applicatae Sinica 2018年第2期34卷 430-437页

作者： Yang-jie JIA wen-shan duan College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China Department of Mathematics Nationalities College of Qinghai Normal University Xining 810008 China

The new coupled KdV equation proposed by Ohta and Hirota, in which the phase shift depends on the mutual positions of solitons at the initial time, is investigated in the framework of prolongation structure theory. It... 详细信息

关键词： integrable equation prolongation structure lax pair

Numerical simulation on modulational instability of ion-acoustic waves in plasma

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Chinese Physics B 2019年第2期28卷 341-345页

作者： Yi-Rong Ma Lie-Juan Li wen-shan duan Center for Quantum Technology Research School of PhysicsBeijing Institute of Technology College of Physics and Electronic Engineering Joint Laboratory of Atomic and Molecular Physics of NWNU&IMP CASNorthwest Normal University

In this paper, the one-dimensional(1D) particle-in-cell(PIC) simulation is used to study the modulation instability of ion acoustic waves in electron–ion plasmas. The ion acoustic wave is described by using a nonlinear Schr¨odinger equation(NLSE) derived from the reductive perturbation method. Form our numerical simulations, we are able to demonstrate that,after the modulation, the amplitude increases steadily over time. Furthermore, by comparing the numerical results with traditional analytical solutions, we acquire the application scope for the reductive perturbation method to obtain the *** also find this method can also be extended to other fields such as fluid dynamics, nonlinear optics, solid state physics,and the Bose–Einstein condensate to validate the application scope of the results from the traditional perturbation method.

关键词： modulational instability particle-in-cell simulation the reductive perturbation method

Effects of the dust size distribution in one-dimensional quantum dusty plasma

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Frontiers of physics 2015年第5期10卷 69-74页

作者： Juan-Fang Han Dong-Ning Gao Heng Zhang Xiao-Yun Wang wen-shan duan College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China Department of Mathematics and Physics Lanzhou Jiao Tong University Lanzhou 730070 China

The effects of the dust size distribution in ultracold quantum dusty plasmas are investigated. The amplitude φm and width ω of quantum dust acoustic waves are studied with different dust size distributions in the system. The φm and ω of the quantum dust acoustic waves are found to increase as the total number density increases. The φm and ω are greater for unusual dusty plasmas than for typical dusty plasmas. Moreover, as the Fermi temperature of the dust grains increases, the φm of the wave decreases. The ω of quantum dust acoustic waves increases as the speed u0 of the wave increases

关键词： dusty plasma electrostatic waves

Small amplitude double layers in an electronegative dusty plasma with q-distributed electrons

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Chinese Physics B 2018年第10期27卷 449-454页

作者： Zhong-Zheng Li Juan-Fang Han Dong-Ning Gao wen-shan duan Physics of Department Gansu Normal University for Nationalities Hezuo 747000 China College of Physics and Electronic Engineering and Joint Laboratory of Atomic and Molecular Physics of Northwest Normal University Lanzhou 730070 China

The small amplitude dust ion-acoustic double layers in a collisionless four-component unmagnetized dusty plasma system containing nonextensive electrons, inertial negative ions, Maxwellian positive ions, and negatively charged static dust grains are investigated theoretically. Using the pseudo-potential approach and reductive perturbation method, an energy integral equation for the system has been derived and its solution in the form of double layers is obtained. The results appear that the existence regime of the double layer is very sensitive to the plasma parameters, e.g., electron nonextensivity,negative-to-positive ion number density ratio etc. It has been observed that for the selected set of parameters, the system supports rarefactive,（compressive） double layers depending upon the degree of nonextensivity of electrons.

关键词： dusty plasmas double layers

Particle-in-cell simulation of ion-acoustic solitary waves in a bounded plasma

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Chinese Physics B 2021年第3期30卷 364-370页

作者： Lin Wei Bo Liu Fang-Ping Wang Heng Zhang wen-shan duan College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China

We study some nonlinear waves in a viscous plasma which is confined in a finite *** averaging the physical quantities on the radial direction in some cases,we reduce this system to a simple one-dimensional *** seems that the effects of the bounded geometry(the radius of the cylinder in this case)can be included in the damping *** notice that the amplitudes of both Korteweg–de Vries(KdV)solitary waves and dark envelope solitary waves decrease exponentially as time increases from the particle-in-cell(PIC)*** dependence of damping coefficient on the cylinder radius and the viscosity coefficient is also obtained numerically and *** are in good *** using a definition,we give a condition whether a solitary wave exists in a bounded ***,some of potential applications in laboratory experiments are suggested.

关键词： ion-acoustic solitary waves particle-in-cell simulation bounded plasmas

Head-on collision between two solitary waves in a one-dimensional bead chain

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Chinese Physics B 2018年第4期27卷 327-334页

作者： Fu-Gang Wang Yang-Yang Yang Juan-Fang Han wen-shan duan Institute of Modem Physics ＆ College of Physics and Electronic Engineering and Joint Laboratory of Atomic and Molecular Physics of Northwest Normal University Lanzhou 730070 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

The head on collision between two opposite propagating solitary waves is studied in the present paper both numerically and *** interesting result is that no phase shift is observed which is different from that found in other branches of *** is found that the maximum amplitude in the process of the head on collision is close to the linear sum of two colliding solitary waves.

关键词： discrete system bead chain solitary waves

Rectification and phase locking of graphite

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Frontiers of physics 2015年第4期10卷 111-118页

作者： Zhen-Bin Zhang Ru-Juan Jia Jasmina Tekic Yang Yang Cang-Long Wang Jia-Wei Li Xiao-Yun Wang wen-shan duan Lei Yang College of Physics and Electronic Engineering Northwest Norvnal University Lanzhou 730070 China Theoretical Physics Department 020 "Vinca" Institute of Nuclear Sciences University of Belgrade P.O. Box 522 11001 Belgrade Serbia Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Department of Chemistry Northwest Normal University Lanzhou 730070 China Department of Mathematics and Physics Lanzhou Jiao Tong University Lanzhou 730070 China

Rectification phenomena and the phase locking in a two-dimensional overdamped Frenkel-Kontorova model with a graphite periodic substrate were studied. The presence of dc and ac forces in the longitudinal direction causes the appearance of dynamicalmode locking and the steps in the response function of the system. On the other hand, the presence of an ac force in the transverse direction causes the appearance of rectification,even though there is no net dc force in the transverse direction. It is found that whereas the longitudinal velocity increases in a series of steps, rectification in the transverse direction can occur only between two neighbor steps. The amplitude and phase of the external ac driving force affect the depinning force,rectification of the system and particles trajectories.

关键词： classical transport friction and lubrication computer simulation of molecular and particle dynamics

Advances in bio-inspired electrocatalysts for clean energy future

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Nano Research 2024年第2期17卷 515-533页

作者： Jing-wen duan Mu Min-Rui Gao Division of Nanomaterials&Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Electrocatalysis can enable efficient energy storage and conversion and thus is an effective way to achieve carbon *** unique structure and function of organisms can offer many ideas for the design of electrocatalysts,which has become one of the most promising research ***,the understanding of the mechanism of bio-inspired electrocatalysis has become clearer,which has promoted the design of bio-inspired catalysts and catalytic *** bio-inspired catalysts(enzyme-like catalysts,layered porous catalysts,superhydrophobic/superhydrophilic surfaces,and so on)have been developed to enable efficient electrocatalytic ***,we discuss the key advances in the field of bio-inspired electrocatalysts progressed in recent ***,the role of bio-inspiration in increasing the intrinsic activity and number of active sites of catalysts is ***,the structure and mechanism of layered porous catalytic systems that mimic biological transport systems are comprehensively ***,the design of three-phase interfaces from micro-nanoscale to atomic scale is highlighted,including the wettability of the electrode surface and the transport system near the *** conclude the review by identifying challenges in bio-inspired electrocatalysts and providing insights into future prospects for the exciting research field.

关键词： bio-inspired electrocatalysts active sites layered porous structure three-phase interface

Unidirectional propagation of water waves near ancient Luoyang Bridge

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Frontiers of physics 2024年第3期19卷 167-174页

作者： Linkang Han Qilin duan Junliang duan shan Zhu Shiming Chen Yuhang Yin Huanyang Chen Shenzhen Research Institute of Xiamen University Shenzhen 518000China Department of Physics Xiamen UniversityXiamen 361005China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education Xiamen UniversityXiamen 361005China

Metasurfaces and metagratings offer new platforms for electromagnetic wave control with significant ***,metasurfaces based on abrupt phase change and resonant structures suffer from the drawback of high loss and face challenges when applied in water ***,the application of metasurfaces in water wave control is not ideal due to the limitations associated with high loss and other *** have discovered that non-resonant metagratings exhibit promising effects in water wave *** the similarity between bridges and metagratings,we have successfully developed a water wave metagrating model inspired by the ancient Luoyang Bridge in *** conduct theoretical calculations and simulations on the metagrating and derive the equivalent anisotropic model of the *** model provides evidence that the metagrating has the capability to control water waves and achieve unidirectional surface water *** accuracy of our theory is strongly supported by the clear observation of the unidirectional propagation phenomenon during simulation and experiments conducted using a reduced version of the *** is the first time that the unidirectional propagation of water waves has been seen in water wave metagrating *** all,we realize the water wave metagrating experiment for the first *** combining complex gratings with real bridges,we explore the physics embedded in the ancient building—Luoyang Bridge,which are of great significance for the water wave metagrating design and provide a new method for analyzing the effects of water waves on *** the same time,this discovery also provides a new idea for ocean cargo transportation,ocean garbage cleaning,and the development and protection of ancient bridges.

关键词： Luoyang Bridge unidirectional propagation water wave metagratings equivalent anisotropic model