A self-adaptive synchronization controller for Liu chaotic systems

A kind of synchronization controller for Liu chaotic systems whose nonlinear components are subject to Lipschitz condition was proposed. By using Lyapunov function and linear matrix inequality technique, a self-adaptive synchronization controller was constructed for Liu chaotic systems. There are two components of our derived synchronization controller: linear and nonlinear component. Linear component is composed of errors of the state variables between driving-systems and responding-stems, and nonlinear co...     

Henon-Heiles体系的混沌控制

分析了不可积哈密顿系统混沌控制的LDG方法,并利用它实现了对Henon-Heiles体系周期1轨迹的混沌控制,通过实例分析了该方法的优点和局限性.     

Pre-processing for time domain image formation in SS-BSAR system

A pre-processing procedure is designed for a space-surface bistatic synthetic aperture radar (SS-BSAR) system when a time domain image formation algorithm is employed. Three crucial technical issues relating to the procedure are fully discussed. Firstly, unlike image formation algorithms operating in the frequency domain, a time domain algorithm requires the accurate global navigation satellite system (GNSS) time and position. This paper proposes acquisition of this information using a time-and-spatial transfer with precise ephemeris and interpolation. Secondly, synchronization errors and compensation methods in SS-BSAR are analyzed. Finally, taking the non-ideal factors in the echo and the compatibility of image formation algorithms into account, a matched filter based on the minimum delay is constructed. Experimental result using real data suggest the pre-processing is functioning properly.     

随机非对称耦合控制螺旋波和时空混沌

通过引入随机非对称耦合方法对螺旋波和时空混沌进行控制,数值模拟结果表明:在选择适当的控制参数下,螺旋波和时空混沌能被控制并最终达到稳定的靶波态,实现了对螺旋波和时空混沌的有效控制,在一定的耦合强度c和随机耦合概率p下,两个不同的系统之间存在相同步和完全同步现象,通过计算瞬时平均相位差△φ和泊松系数γ进一步验证了这一现象...     

纷乱、纷争中的集权趋势——辛亥革命的必然结局

辛亥年,浙江迅速取得了光复的胜利,随即又陷入社会纷乱和政治纷争之中———仍然贫穷、破败的农村成为社会纷乱的源头;新政权内部权利纷争不断。但乱极而治是规律,重建秩序和权威是必须。只是在20世纪初的浙江土地上,重建秩序与规范的社会要求,并没有导向民主政治的法制建设、法治运作,而是旧式的集权、强权和武力,并回复专制。浙江光复的这一结局,也是整个辛亥革命最后趋向的缩影。     

下丘脑-垂体-肾上腺轴激素分泌的周期震荡及混沌现象

结合生理学内分泌调节理论,采用了变步长龙格-库塔法,以Matlab软件为计算平台,对改进的下丘脑-垂体-肾上腺轴激素脉冲分泌的非线性动力学进行了参变量数据模拟,求出了下丘脑-垂体-肾上腺轴激素脉冲分泌的周期振荡解及混沌解.结果显示,此分泌系统中激素浓度变化与实验事实相符,其混沌模型是合理的.     

浅谈广播电视数字通信系统的网同步

介绍了广播电视实现数字传输的特殊性,分析了网同步的必要性、方式及时钟类型,从时钟的工作模式、SDH(同步数字体系,Synchronous Digital Hierarchy)网同步的工作方式和SDH网元的定时方法等,指出只有实现数字通信网的网同步,才能实现数字节目的正常接收和交换。     

在非线性三波耦合的不稳定饱和过程中的Lorenz型混沌

我们证明了在等离子体中,三波耦合方程同构于 Lorenz 型方程,预言了在此过程中会出现 Lorenz 型混沌.     

涡运动:混沌与混合机理

本文综述了利用非线性动力学方法研究有涡流动的进展,并讨论了它们在流体混合机理研究中的应用.