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Conformists and Contrarians in a Kuramoto Model with Uniformly Distributed Natural Frequencies

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Communications in Theoretical Physics 2013年第6期59卷 684-688页

作者： YUAN Di yang jun-zhong School of Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Physics and Electrical Engineering Anyang Normal University Anyang 455000 China

A generalization of the Kuramoto model in which oscillators are coupled to the mean field with random signs is investigated in this work. We focus on a situation in which the natural frequencies of oscillators follow a uniform probability density. By numerically simulating the model, we find that the model supports a modulated travelling wave state except for already reported 7r state and travelling wave state in the one with natural frequencies following Lorenztian probability density or a delta function. The dependence of the observed dynamics on the parameters of the model is explored and we find that the onset of synchronization in the model displays a non-monotonic dependence on both positive and negative coupling strength.

关键词： Kuramoto model modulated travelling wave state conformist contrarian

Generalized Synchronization in a Drive-Response System

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Communications in Theoretical Physics 2008年第2期49卷 391-395页

作者： yang jun-zhong ZHANG Mei School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Center for Advanced Study Tsinghua University Beijing 100084 China

The phenomena of GS in a drive-response system have been studied. Several kinds of GS are found： the driver-induced GS, the responser-induced GS, and the intermediate GS. The mechanism generating these types of GS is... 详细信息

关键词： generalized synchronization drive-response system

Transition to Amplitude Death in Coupled System with Small Number of Nonlinear Oscillators

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Communications in Theoretical Physics 2009年第3期51卷 460-464页

作者： CHEN Hai-Ling yang jun-zhong School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

In this work, we investigate the amplitude death in coupled system with small number of nonlinear oscillators. We show how the transitions to the partial and the complete amplitude deathes happen. We also show that th... 详细信息

关键词： coupled nonlinear oscillators amplitude death phase synchronization

Organization of the Strategy Pattern in Evolutionary Prisoner's Dilemma Game on Scale-Free Networks

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Chinese Physics Letters 2011年第6期28卷 1-4页

作者： CHENG Hong-Yan yang jun-zhong School of Science Beijing University of Posts and TelecommunicationsBeijing 100876

Based on the recently proposed concepts of asymptotic behaviors,*** cooperator,pure defector and fluctuating strategy,we explore thoroughly the dynamical organization of the strategy pattern in evolutionary prisoner's... 详细信息

关键词： pure lemma asymptotic

Wave Instability and Spatiotemporal Chaos in Reaction-Diffusion System with Oscillatory Dynamics

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Communications in Theoretical Physics 2006年第1期45卷 180-188页

作者： XIE Fa-Gen yang jun-zhong LI Hong-Gang Research Department Kaiser Permanente 100 S. Los Robles Ave Pasadena CA 91101 USA School of Sciences Beijing University of Posts and Telecommunications Beijing 100876 China Department of Systems Science Beijing Normal University Beijing 100875 China

We investigate the Turing-like wave instability of the uniform oscillator in oscillatory mediums using theoretical and flumerical methods. A propagating wave pattern originated at the corner of the system emerges when the uniform oscillator becomes unstable via Thring-like wave instability. Bifurcations from periodically propagated wave patterns to quasi-periodically propagated wave patterns, then to spatiotemporal chaos occur, as the system size increases from the instability threshold of the uniform oscillator.

关键词： wave instability oscillator reaction-diffusion chaos

Optimal Cooperation Enhancement on Spatial Networks

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Chinese Physics Letters 2014年第11期31卷 1-4页

作者： Tao Shui-Yuan Cui Ming-Zhu Dai Qiong-Lin yang jun-zhong Beijing Univ Posts & Telecommun Sch Sci Beijing 100876 Peoples R China

We investigate the evolutionary Prisoner＇s dilemma game on the simplest spatial networks constructed as geometrical graphs. The optimal cooperation enhancement against the topology randomness is found. It is proposed that the optimal behavior of the cooperation results from the competition between individuals with high degrees and with low degrees： the former assists the formation of cooperator clusters and the latter tends to prevent the formation of such dusters.

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Dynamic response of UHMWPE plates under combined shock and fragment loading

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Defence Technology（防务技术） 2023年第9期27卷 9-23页

作者： Chun-Zheng Zhao Lu-Sheng Qiang Rui Zhang Qian-Cheng Zhang jun-yang zhong Zhen-Yu Zhao Tian Jian Lu State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016PR China MIIT Key Laboratory of Multi-functional Lightweight Materials and Structures(MLMS) Nanjing University of Aeronautics and AstronauticsNanjmg 210016PR China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhai430200PR China School of Aerospace Xi'an Jiaotong UniversityXi'an710049PR Chuia

Ultra-high molecular weight polyethylene(UHMWPE)fiber composite has been extensively used to construct lightweight protective structures against ballistic impacts,yet little is known about its performance when subjected to combined blast and fragment *** upon a recently developed laboratory-scale experimental technique to generate simulated combined loading through the impact of a fragment-foam composite projectile launched from a light gas gun,the dynamic responses of fullyclamped UHMWPE plates subjected to combined loading were characterized experimentally,with corresponding deformation and failure modes compared with those measured with simulated blast loading ***,to explore the underlying physical mechanisms,three-dimensional(3D)numerical simulations with the method of finite elements(FE)were systematically carried *** predictions compared favorably well with experimental measurements,thus validating the feasibility of the established FE *** to the case of blast loading alone,combined blast and fragment loading led to larger maximum deflections of clamped UHMWPE *** position of the FSP in the foam sabot affected significantly the performance of a UHMWPE target,either enhancing or decreasing its ballistic *** the blast loading and fragment impact arrived simultaneously at the target,its ballistic resistance was superior to that achieved when subjected to fragment impact alone,and benefited from the accelerated movement of the target due to simultaneous blast loading.

关键词： UHMWPE composite Ballistic performance Combined blast and fragment loading Impact test Finite element simulation

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农户外出务工及对区域经济影响的研究

经济经纬 2009年第3期26卷 66-68页

作者：杨俊中河南大学环境与规划学院河南开封475001

通过对农户外出务工的区位特征、渠道以及对区域经济的影响的研究发现,不同区域经济发展水平和不同地域农户外出务工的区位具有不同的空间分布特征;外出务工渠道以自发外出为主,社会网络和其他途径具有重要作用;外出务工对区域经济具有... 详细信息

通过对农户外出务工的区位特征、渠道以及对区域经济的影响的研究发现,不同区域经济发展水平和不同地域农户外出务工的区位具有不同的空间分布特征;外出务工渠道以自发外出为主,社会网络和其他途径具有重要作用;外出务工对区域经济具有双重影响。然而,现有文献多是研究外出务工对宏观层面上区域经济的影响,基于农户的微观区位的研究较少,尤其是对外出务工对村域经济影响的关注有待提高。

关键词：农户外出务工区域经济

PREPARATION OF HETEROPOLY COMPOUND MEMBRANE AND ITS CATALYTIC PROPERTY

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Chinese Journal of Catalysis 1999年第6期20卷 589-590页

作者： Zhang Yuanming, Song Ruiqi, Mao Xuan, yang jun, zhong Bangke (Department of Chemistry, Jinan University, Guangzhou 510632) 暨南大学广东广州

Heteropoly compounds (HPC), a kind of polyoxometallates, with their strong acidity and oxidative ability, are good homogeneous and heterogeneous catalysts in both acid-catalyzed and selective oxidation reactions, and have been widely used in petroleum and fine chemical industries. Owing to the diversity in their composition and structure, the catalytic properties of HPC can be altered in a wide range. Among them, the heteropolyanions with Keggin structure have been studied by far the most,especially on their applications in heterogeneous catalysis. However, since they are thermally unstable at high temperatures, their utilization in this field has been restricted. In the last ten years, inorganic membranes have been proved to be beneficial to heterogeneous catalytic processes for their high selectivity and good heat-conductivity. And the sol-gel method, one of the most common approaches to prepare inorganic membranes, is becoming mature. Here a sol-gel method to prepare a porous HPC membrane is reported. The catalytic performance of the membrane was tested through a model reaction, the selective oxidation of t-BuOH.

关键词： heteropoly compound inorganic membrane butanol selective oxidation methacrylic acid