一致稳定合作系统的全局稳定性

本文讨论了一类合作系统的解的收敛性.其基本假设是Jacobi矩阵在中一致稳定．在这个假设下,我们对这类系统给出了完整的全局性态．本文的主要结果如下：如果系统有一个正平衡点,那么它在Int中全局渐近稳定,并给出了系统的非负平衡点全局渐近稳定的充分必要条件．     

具有扩散影响的Hopfield型神经网络的全局渐近稳定性

对具有扩散影响的Hopfield型神经网络平衡点的存在唯一性和全局渐近稳定性进行了研究．在激活函数单调非减、可微且关联矩阵和Liapunov对角稳定矩阵有关时,利用拓扑度理论得到了系统平衡点存在的充分条件．通过构造适当的平均Liapunov函数,分析了系统平衡点的全局渐近稳定性．所得结论表明系统的平衡点(如果存在)是全局渐近稳定的而且也蕴含着系统的平衡点的唯一性．     

一类具有饱和传染力的Schoner竞争系统的概周期解

对一类具有饱和传染力的Schoner竞争系统进行了研究,得到了系统持久生存和任一正解全局渐近稳定的充分条件;同时当系统是概周期系统时,通过构造适当的Liapunov函数,建立了相应系统存在唯一、全局渐近稳定的概周期正解的充分判据.     

一类具有阶段结构和时滞的非自治捕食系统

本文研究一类具有阶段结构和时滞的非自治捕食系统解的渐近性质 ,在适当条件下 ,得到系统是持续生存的且全局渐近稳定的     

四阶非线性系统的全局渐近稳定性

运用构造李雅普诺夫函数的方法 ,研究了一类四阶非线性系统的全局渐近稳定性 ,给出了该系统零解全局渐近稳定的充分条件     

一类具有阶段结构和时滞的非自治捕食系统

本研究一类具有阶段结构和时滞的非自治捕食系统解的渐近性质,在适当条件下,得到系统是持续生存的且全局渐近稳定的。     

带有分布时滞和非线性发生率的媒介-宿主传染病模型全局稳定性(英文)

本文分析一类带有分布时滞和非线性发生率的媒介-宿主传染病动力学性质,得到模型基本再生数R0,发现系统中平衡态的全局动力学性质能够由基本再生数来完全确定:即,如果R01,无病平衡态是全局渐近稳定的;如果R01,则系统存在唯一地方病平衡态,并且该平衡态是全局渐近稳定的.     

Lienard方程零解全局渐近稳定的充要条件

本文在一定条件下,给出了Lienard方程零解全局渐近稳定的充要条件.它包括了以往关于这一问题的所有结果,并给出了必要性条件.作者还修正了Krasovskji对一类方程零解全局渐近稳定所加的条件.     

一类具有Machaelis-Menten型功能性反应的非自治两捕食者-两竞争食饵的系统的持久性与稳定性

研究了两捕食者均具有Machaelis-Menten型功能性反应,两食饵具有竞争关系的捕食系统,利用比较定理,得到了系统持久生存的充分条件,通过构造Liapunov函数,给出了系统全局渐近稳定的充分条件.此外,当系统是周期系统时,得到了系统正周期解存在唯一且全局渐近稳定的充分条件.最后,通过数值模拟来验证结论的正确性.     

具有功能性反应的非自治竞争系统的持续性

本文讨论了具有 类功能性反应的非自治扩散竞争系统 .在一定条件下证明了系统是持续的 ,给出了系统全局渐近稳定的充分条件 .     

退化时滞微分系统的特征根分布与指数稳定

该文首先研究了退化时滞微分系统的特征根分布, 指出如果退化时滞微分系统的所有特征根都具有负实部, 在一个条件下, 特征根的负实部的最大值为负.由此可以得到一个条件, 在该条件下如果所有特征根都具有负实部, 则退化时滞微分系统的解是指数稳定的.作为例子, 对中立型给出其解为指数稳定的条件.     

On stability of switched homogeneous nonlinear systems

In this paper, the problem of stability of switched homogeneous systems is addressed. First of all, if there is a quadratic Lyapunov function such that nonlinear homogeneous systems are asymptotically stable, a matrix Lyapunov-like equation is obtained for a stable nonlinear homogeneous system using semi-tensor product of matrices, and Lyapunov equation of linear system is just its particular case. Following the previous results, a sufficient condition is obtained for stability of switched nonlinear homogeneous systems, and a switching law is designed by partition of state space. In particular, a constructive approach is provided to avoid chattering phenomena which is caused by the switching rule. Then for planar switched homogeneous systems, an LMI approach to stability of planar switched homogeneous systems is presented. Similar to the condition for linear systems, the LMI-type condition is easily verifiable. An example is given to illustrate that candidate common Lyapunov function is a key point for design of switching law.     

New results on the parametric stability of nonlinear systems

In this paper, we derive some new results on the parametric stability of nonlinear systems. Explicitly, we derive a necessary and sufficient condition for a nonlinear system to be locally parametrically exponentially stable at an equilibrium point. We also derive a necessary condition for the nonlinear system to be locally parametrically asymptotically stable at an equilibrium point. Next, we derive some new results on the parametric stability of discrete-time nonlinear systems. As in the continuous case, we derive a necessary and sufficient condition for a discrete-time nonlinear system to be locally parametrically exponentially stable at an equilibrium point. We also derive a necessary condition for the discrete-time nonlinear system to be locally parametrically asymptotically stable at an equilibrium point. We illustrate our results with some classical examples from the bifurcation theory.     

The asymptotic stability and exponential stability of nonlinear stochastic differential systems with Markovian switching and with polynomial growth

This paper discusses the asymptotic stability and exponential stability of nonlinear stochastic differential systems with Markovian switching (SDSwMSs). The systems coefficients are assumed to satisfy local Lipschitz condition and polynomial growth condition. By applying some novel techniques, we propose some conditions under which such SDSwMSs are asymptotically stable and exponentially stable. Nontrivial examples are provided to illustrate our results.     

Stability analysis of a class of nonlinear positive switched systems with delays

This paper addresses the stability problem of delayed nonlinear positive switched systems whose subsystems are all positive. Both discrete-time systems and continuous-time systems are studied. In our analysis, the delays in systems can be unbounded. Two conditions are established to test the local asymptotic stability of the considered systems. The method to compute the domains of attraction is also proposed provided that the system is locally asymptotically stable. When reduced to general nonlinear positive systems, that is, the considered switched system consists of only one mode, an interesting conclusion follows that the proposed nonlinear positive system is locally asymptotically stable for all admissible delays and nonnegative nonlinearities which satisfy an extra condition at the origin, if and only if the system represented by the linear part is asymptotically stable for all admissible delays. Finally, a numerical example is presented to illustrate the obtained results.     

开环与闭环时变人口系统的稳定性

其中各人口函数 p(r,t),μ(r,t),f(r),(?)(t)以及 r_m 的实际意义与文[1]相同.系统(1)—(3)(以下简称为系统(Ⅰ))是一开环时变人口系统,(?)(t)为系统(Ⅰ)的控制变量.本文将给出绝对出生率(?)(t)的时变临界值(?)_c(t),并给出系统(Ⅰ)稳定与渐近稳定的充分条件以及该系统稳定的必要条件.     

Stability analysis of switched impulsive systems with time delays

In this paper, a new stability analysis of switched impulsive systems with time delays whose subsystem is not necessarily stable is presented. A sufficient condition on uniformly asymptotical stability for nonlinear switched impulsive systems is obtained. Using the result obtained and the minimum (maximum) holding time, an easily verifiable condition on uniformly asymptotical stability for linear switched impulsive systems with time delays is derived. The control synthesis is also discussed. Finally, two examples with simulation results are given to validate the results.     

Finite-time stability and stabilization of nonlinear stochastic hybrid systems

This paper deals with the problem of finite-time stability and stabilization of nonlinear Markovian switching stochastic systems which exist impulses at the switching instants. Using multiple Lyapunov function theory, a sufficient condition is established for finite-time stability of the underlying systems. Furthermore, based on the state partition of continuous parts of systems, a feedback controller is designed such that the corresponding impulsive stochastic closed-loop systems are finite-time stochastically stable. A numerical example is presented to illustrate the effectiveness of the proposed method.     

Infinitesimally stable and unstable singularities of 2-degrees of freedom completely integrable systems

In this article we give a list of 10 rank zero and 6 rank one singularities of 2-degrees of freedom completely integrable systems. Among such singularities, 14 are the singularities that satisfy a non-vanishing condition on the quadratic part, the remaining 2 are rank 1 singularities that play a role in the geometry of completely integrable systems with fractional monodromy. We describe which of them are stable and which are unstable under infinitesimal completely integrable deformations of the system.