中立多变时滞Volterra型随机动力系统的稳定性

探讨了一类非线性随机积分微分动力系统,并通过Banach不动点方法,给出了该系统零解均方渐近稳定的充要条件,形成了中立多变时滞Volterra型随机积分微分动力系统零解均方渐近稳定性定理。与前人的研究方法不同,该文根据多变时滞随机动力系统各时滞的特点,灵活构造算子,相比以往文献的方法更加灵活实用。文章的结论一定程度上改进和发展了相关研究论文的结果。另外,文章所得结论补充并推广了不动点方法在研究非线性中立多变时滞Volterra型随机积分微分动力系统零解稳定性方面的成果。     

具时滞Kolmogorov系统的强区间稳定性与部分稳定性

通过得用区间动力系统的稳定性理论和构造适当的Ｌｙａｐｕｎｏｖ科学家函，我们讨论了具离散时滞Ｋｏｌｍｏｇｏｒｏｖ生态系统的渐近性，分别获得了该系统强稳定、部分稳定的充分条件。     

一类具有垂直传染的传染病模型的稳定性

基于动力系统的理论,讨论了一类具有垂直传染的传染病模型的稳定性.采用下一代矩阵法获得了基本再生数R₀.当R₀<1时,由Routh-Hurwitz判别法,得到了无病平衡点的局部渐近稳定性.通过构造Lyapunov函数,证明了系统在无病平衡点全局渐近稳定.当R₀> 1时,地方病平衡点存在且唯一,借助Routh判据,得出了系统在地方病平衡点局部渐近稳定的条件,并通过构造Lyapunov函数,证明了系统在地方病平衡点全局渐近稳定.最后,用数值模拟验证了结论的合理性.     

时标上的一类二元神经网络模型的渐进性

在基于时标的稳定性理论基础上,考虑了时标上的一类二元神经网络动力系统的收敛性的充分条件,所得结论统一了已有连续和离散形式.通过讨论时标上一类带有McCulloch-pitts型信号函数的二元神经网络模型的渐进行为.将动力模型转化为时标上的几个方程来考虑,并应用时标中的微分学理论以及基本的不等式放缩传递方法,通过对建立的一维映射的迭代规律进行分析,得到神经网络模型的收敛性.     

格点动力系统中的异宿环

讨论格点动力系统中空间混沌出现的一个判据——异宿环.证明了若格点动力系统有渐近稳定的异宿环,则系统有渐近稳定的同宿点,从而系统有空间混沌.     

人口总数变化的急慢性阶段年龄结构传染病模型及稳定性

本文讨论总人口数量变化的具有急性及慢性阶段且都能感染的年龄结构传染病模型,求出了与人口增长指数λ*相关的基本再生数R_0.利用谱理论和齐次动力系统等理论证明,若R_01,则无病平衡点局部渐近稳定;若R_01,则无病平衡点不稳定,这时还有地方病平衡点,并得到地方病平衡点的局部渐近稳定性条件.     

时标上带有反馈控制的两种群竞争系统的概周期解

研究了一类时标上带有反馈控制的两种群竞争系统的概周期解的存在性与稳定性.首先应用微分不等式和比较原理得到了该系统的持久性.在此基础上,通过构造了一个合适的Lyapunov泛函,得到该系统存在唯一一致渐近稳定正概周期解的充分条件.文中对以前的相关文献研究结果进行了推广.     

泛函微分方程的弱指数渐近稳定性

本文提出一种新的稳定性概念,即弱指数渐近稳定,并给出两个关于弱指数渐近稳定的判别定理和一个较广泛的指数渐近稳定判别结果.从而使得许多具有一致渐近稳定性的解的趋零速度,得到了一种估计.文中还深入地揭露了一致渐近稳定性和弱指数渐近稳定性之间的内在联系以及弱指数渐近稳定性和指数渐近稳定性的关系.     

一类离散动力系统的稳定性

讨论离散动力系统yn 1=yneb(1-2yn-k)1-yn yneb(1-2yn-k),(n∈N,b∈(0,∞),K∈N )的稳定性.当k=1时,若02,则-y=12不稳定;当k 2时,若0相似文献   

时标上具反馈控制互惠系统的持久性与概周期解[英文]

本文研究时标上一类具有反馈控制的互惠系统.首先,构建时标上两个重要不等式,基于这些结果,得到系统是持久的充分条件.进一步,运用概周期函数的性质,并构建适当的Laypunov泛函,得到系统存在唯一一致渐近稳定的概周期解的充分条件.     

On the Stability of Periodic Impulsive Systems

In this paper, we consider periodic systems of ordinary differential equations with impulse perturbations at fixed points of time. It is assumed that the system possesses the trivial solution. We show that if the trivial solution of the system is stable or asymptotically stable, then it is uniformly stable or uniformly asymptotically stable, respectively. By using the method of Lyapunov functions, we establish criteria of uniform asymptotical stability and instability.     

Massera-Type theorem and asymptotically periodic Logistic equations

Some important properties of asymptotically periodic functions were studied in this paper. Sufficient conditions of existence of globally stable asymptotically periodic solution were obtained. Then, Massera-Type theorems were discussed for one-dimensional, two-dimensional, higher-dimensional asymptotically periodic systems. Finally, global stability of periodic Logistic equations and asymptotically periodic Logistic equations were considered, respectively.     

An asymptotic stability involving collision and avoidance

Generally it is not easy task whether the stable systems governed by nonlinear ordinary differential equations are asymptotically stable or not. This problem often appears in studying a collision and avoidance control problem based on the stability theory. In this paper we devoted to finding conditions that the stable system obtained from the collision and avoidance control problem is asymptotically stable.     

Non-uniform asymptotic stability for the damped linear oscillator

Sufficient conditions are established for non-uniform asymptotic stability of a linear oscillator with damping term. The obtained results clarify a difference between the uniform asymptotic stability and the asymptotic stability. Some simple examples are included to illustrate the results. Especially, Bessel’s differential equations are taken up and it is proved that the equilibrium is asymptotically stable, but it is not uniformly asymptotically stable.     

STABILITY OF TIME-PERIODIC TRAVELING FRONTS IN BISTABLE REACTION-ADVECTION-DIFFUSION EQUATIONS

This paper is concerned with the global exponential stability of time periodic traveling fronts of reaction-advection-diffusion equations with time periodic bistable nonlinearity in infinite cylinders.It is well known that such traveling fronts exist and are asymptotically stable.In this paper,we further show that such fronts are globally exponentially stable.The main difficulty is to construct appropriate supersolutions and subsolutions.     

Resonance bifurcation from homoclinic cycles

Differential equations that are equivariant under the action of a finite group can possess robust homoclinic cycles that can moreover be asymptotically stable. For differential equations in R⁴ there exists a classification of different robust homoclinic cycles for which moreover eigenvalue conditions for asymptotic stability are known. We study resonance bifurcations that destroy the asymptotic stability of robust ‘simple homoclinic cycles’ in four-dimensional differential equations. We establish that typically a periodic trajectory near the cycle is created, asymptotically stable in the supercritical case.     

非线性变延迟微分方程隐式Euler法的渐近稳定性

本讨论非线性变延迟微分方程隐式Euler法的渐近稳定性。我们证明，在方程真解渐近稳定的条件下，隐式Euler法也是渐近稳定的。     

Asymptotically stable invariant manifold for coupled nonlinear parabolic-hyperbolic partial differential equations

This article considers a coupled system of nonlinear parabolic and hyperbolic partial differential equations which arises in the study of wave phenomena which are heat generating or temperature related. Under appropriate conditions, for example high thermal diffusivity, it is proved that there exists an invariant manifold for the full system of equations. The asymptotic stability of the invariant manifold is also considered. Moreover, it is shown that an equilibrium which is asymptotically stable for flows on the invariant manifold will be asymptotically stable for the full system.     

一类中立型延迟积分微分方程Runge-Kutta方法的稳定性

讨论了一类非线性中立型延迟积分微分方程Runge-Kutta方法的稳定性.在适当的条件下证明了运用Runge-Kutta方法求解这类方程既是数值稳定的也是渐近稳定的.     

Impulsive stabilization of functional differential equations with infinite delays

In this paper, we study the stability of a class of impulsive functional differential equations with infinite delays. We establish a uniform stability theorem and a uniform asymptotic stability theorem, which shows that certain impulsive perturbations may make unstable systems uniformly stable, even uniformly asymptotically stable.