具有无限时滞的中立型高维周期微分系统的周期解

本文考虑中立型高维周期微分系统d/dt(x(t)+cx(t-r))=A(t,x(t-r(t)))x(t)+ ∫t-∞C(t,s)x(s)ds+f(t,xt)+b(t)的T-周期解的存在性问题,利用线性系统的指数型 二分性和Krasnoselskii不动点定理,建立了保证系统存在T-周期解的充分条件.     

一类退化中立型微分系统的周期解

该文考虑一类退化中立型微分系统，利用不动点定理，得到了这类系统周期解存在的充分条件．     

具无限时滞的非线性积分微分方程的周期解

本文考虑具无限时滞非线性积分微分方程和其中t∈R,T≥0是常数,x∈Rn;A(t,x),C(t,s)为n×n连续的函数矩阵;f(t,x),g(t,x),b(t)是n维连续向量.本文利用线性系统的指数型二分性理论和不动点定理研究此系统,建立了保证其周期解存在性.唯一性的充分条件.得到了一些新的结果,推广了相关文献的主要结果.     

具有无穷时滞退化微分系统的周期解

讨论具有无穷时滞的非线性退化微分系统E(t)x(t)=A(t)x(t) integral from n=-∞to 0(H(t,s)x(t s)ds f(t,x_t)).的周期解问题.利用矩阵测度和Krasnoselskii不动点定理获得了系统存在周期解的充分条件,并且实例说明了所得结果的有效性.     

一类退化中立型微分系统的周期解

该文考虑一类退化中立型微分系统, 利用不动点定理, 得到了这类系统周期解存在的充分条件.     

一类中立型退化时滞微分方程的周期解

讨论了一类中立型退化时滞微分方程的周期解的存在条件,并且给出了二维退化滞后微分方程的周期解的存在性问题,且给出了一个充要条件和两个充分条件,最后举例说明结论的有效性。     

一类具分布时滞的退化微分系统的周期解

本文利用重合度理论讨论一类具分布时滞的退化微分系统的周期解存在性,给出了周期解的存在条件.     

具有变量时滞的周期微分系统的周期解

本文考虑周期微分系统x(t) =A(t,x(t- r1(t) ) ) x(t) + f (t,x (t- r2 (t) ) )的 T-周期解的存在性问题 ,其中 (t,x)∈R× Rn,A(t,x)是 n× n连续矩阵函数 ,f(t,x)是 n维连续向量函数 ,时滞 ri(t) (i=1,2 )是连续函数 ,且 A(t+ T,x) =A(t,x) ,f(t+ T,x) =f(t,x) ,ri(t+ T) =ri(t) (i=1,2 ) ,常数T>0 .本文利用不动点方法 ,建立了保证系统存在 T-周期解的充分条件 ,推广了文 [1- 3]的相关结果 .     

具有混合时滞的中立型Hopfield神经网络的概周期解

研究一类具有混合时滞的中立型Hopfield神经网络概周期解.通过运用指数二分性及不动点定理,获得了其概周期解的存在性与全局指数稳定性的充分条件,所得结果是新的,并且推广和改进了已有文献的相关结果.     

具无限时滞线性中立型泛函微分方程周期解

本文证明了具无限时滞D算子型线性中立型泛函微分方程存在周期解当且仅当存在有界解,推广了MasseraJ．L,ChowS．N．和MakayM．的结果．     

PERIODIC SOLUTIONS FOR A CLASS OF DEGENERATE NEUTRAL PERIODIC SYSTEM WITH DELAY

In this paper, using fixed point method, discusses the problem of periodic solution for a class of degenerate neutral periodic system with delay, and obtains some sufficient conditions for the existence and uniqueness of periodic solution of the system, the result extends and improves some results of paper [1-2].     

PERIODIC SOLUTIONS TO NEUTRAL FUNCTIONAL DIFFERENTIAL EQUATIONS WITH INFINITE DELAY

A new and convenient method is used to study the existence of periodic solutions to neutral functional differential equations with infinite delay. A new criterion for the existence of periodic solutions is obtained in this paper.     

PERIODIC SOLUTION FOR A CLASS OF NEUTRAL HIGHER DIMENSIONAL DIFFERENTIAL SYSTEM WITH DELAY

This paper,using the theory of exponential dichotomy and fixed point theo- rem,discusses the existence of periodic solution for a class of neutral higher dimensional differential system with delay,the result extends and improves the result of paper[6].     

PERIODIC SOLUTIONS OF SCALAR NEUTRAL VOLTERRA INTEGRO-DIFFERENTIAL EQUATIONS WITH INFINITE DELAY

This paper deals with the existence and uniqueness of periodic solutions of the following scalar neutral Volterra integro-differential equation with infinite delaywhere a, C, D, f are continuous functions, also a(t + T) = a(t), C(t + T,s + T) = C(t, s), D(t + T,s + T) = D(t, s), f(t + T) = f(t). Sufficient conditions on the existence and uniqueness of periodic solution to this equation are obtained by the contraction mapping theorem.     

EXISTENCE OF POSITIVE PERIODIC SOLUTIONS FOR INFINITE DELAY FUNCTIONAL DIFFERENTIAL EQUATIONS

In this paper, the existence of positive periodic solutions for infinite delay functional differential equations(FDEs for short) is discussed by utilizing a fixed point theorem on a cone in Banach space. Some results on the existence of positive periodic solutions are derived.     

具有无穷时滞的中立型积分微分系统的平稳振荡

利用重合度理论中的延拓定理和微分积分不等式讨论具有无穷时滞的中立型积分微分系统其中x(t)=(x1(t),…,xn(t))T,G∈C2(Rn,R),f∈C(R×R×Rn×Rn,Rn),e∈C(R,Rn),e(t ω)≡e(t),f(t ω,u ω,x,y)≡f(t,u,x,y),f(t,u,0,0)≡0,t,u∈R,x,y∈Rn,ω>0为常数,获得了该系统平稳振荡的易于检验的判别条件.     

EXISTENCE OF MILD SOLUTIONS TO NEUTRAL FRACTIONAL DIFFERENTIAL EQUATIONS WITH INFINITE DELAY

In this paper, we consider the existence of mild solution to a class of neutral fractional differential equations with infinite delay. By means of fixed points methods, we obtain some sufficient conditions for the existence and uniqueness of mild solutions, which extend some known results.     

THE POSITIVE PERIODIC SOLUTIONS OF PERIODIC RFDEs WITH INFINITE DELAY

This paper is concerned with the periodic retarded functional differential equati-ons(RFDEs) with infinite delay. The sufficient conditions for the existence of noncon-stant positive periodic solutions are established by combining the theory of monotone semiflows generated by RFDEs with infinite delay and the fixed point theorems of solution operators. A nontrivial application of the results obtained here to a well-known nonautonomous Lotka-Volterra system with infinite delay is also presented.     

无穷时滞泛函微分方程周期解的存在性

本文利用Mawhin度的方法在较容易判别和较简单的假设下,得到ω周期方程存在周期解．