检索结果-南通市图书馆

Analytical and Numerical Studies for Chaotic Dynamics of a Duffing Oscillator with a Parametric Force

Communications in Theoretical Physics 2007年第3X期48卷 477-480页

作者： WANG Yan-Qun WU Qin Department of Mathematics Hengyang Normal University Hengyang 421008 China School of Basic Medical Science Guangdong Medical College Dongguan 523808 China

The chaotic dynamics of a Duffing oscillator with a parametric force is investigated. By using the direct perturbation technique, we analytically obtain the general solution of the lst-order equation. Through the boundedness condition of the general solution we get the famous Melnikov function predicting the onset of chaos. When the parametric and external forces are strong, numerical simulations show that increasing the amplitude of the parametric or external force can lead the system into chaos via period doubling.

关键词： general solution Melnikov function period doubling chaos

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atomic population oscillations between two coupled Bose-Einstein condensates with time-dependent nonlinear interaction

引用

Chinese Physics B 2007年第3期16卷 650-659页

作者：李飞舒维星罗海陆任中洲 Department of Physics Nanjing University Nanjing 210093 China

The atomic population oscillations between two Bose-Einstein condensates with time-dependent nonlinear interaction in a double-well potential are studied. We first analyse the stabilities of the system＇s steady-state solutions. And then in the perturbative regime, the Melnikov chaotic oscillation of atomic population imbalance is investigated and the Melnikov chaotic criterion is obtained. When the system is out of the perturbative regime, numerical calculations reveal that regulating the nonlinear parameter can lead the system to step into chaos via period doubling bifurcations. It is also numerically found that adjusting the nonlinear parameter and asymmetric trap potential can result in the running-phase macroscopic quantum self-trapping （MQST）. In the presence of a weak asymmetric trap potential, there exists the parametric resonance in the system.

关键词： Bose-Einstein condensates Melnikov chaotic criterion period doubling macroscopic quantum self-trapping

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

On Flow Vortex Shedding Behind Two Side-by-Side Cylinders

On Flow Vortex Shedding Behind Two Side-by-Side Cylinders

引用

第四届海峡两岸计算流体力学学术研讨会

作者： Robert R. Hwang and Yih-Ferng Peng Professor, Institute of Physics, Academia Sinica, Taipei 11529, Taiwan Assistant professor, Department of Civil Engineering, National Chi-Nan University, Taiwan

＜正＞ Low Reynolds number in-phase and anti-phase vortex shedding flows behind two side-by-side square cylinders in a uniform flow are studied both by direct numerical simulations and by experimental flow-visualization method. Above a critical gap ratio （g*=1）, vortex shedding synchronizations are observed to occur either in in-phase or in anti-phase. Below the critical gap ratio, the vortex shedding behavior is observed to become asymmetric. The developed in-phase, anti-phase, and the asymmetric vortex shedding flows along with time-velocity histories are presented and analyzed with the help of Fourier power spectrum of the velocity of evolution, and the phase-space trajectory of the velocities. Interestingly, the spatially period doubling and the inverse period doubling like phenomena are observed for the in-phase and the asymmetric vortex shedding flows, respectively.

关键词： Vortex shedding period doubling Direct numerical simulation Particle Tracing Visualization.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：