Oscillation of certain partial difference equations

In this paper we consider a class of nonlinear delay partial difference equations and a class of linear delay partial difference equations with variable coefficients, which may change sign. We obtain oscillation criteria for these equations. There are no results for the oscillation of these equations up to now.     

Interval oscillation criteria for a forced second-order nonlinear differential equations with damping

In this paper, we are concerned with the oscillations in a class of forced second-order differential equations with nonlinear damping terms. By using classical variational principle and averaging technique, several new interval oscillation criteria for the equations are established, which improve and extend some known results. Example is also given to illustrate the results.     

具连续分布滞量的非线性中立型抛物偏泛函微分方程的振动性

考虑一类具连续分布滞量的非线性中立型抛物偏泛函微分方程解的振动性,借助Green定理和时滞微分不等式获得了这类方程在Robin,Dirichlet边值条件下所有解振动的若干充分条件.     

Oscillation and asymptotic behavior for second-order nonlinear perturbed differential equations

In this paper, for all regular solutions of a class of second-order nonlinear perturbed differential equations, new oscillation criteria are established. Asymptotic behavior for forced equations is also discussed.     

二阶非线性阻尼微分不等式解的振动性质

研究了一类二阶非线性阻尼微分不等式解的振动性质.在一定条件下,建立了两个新的振动性定理,推广和改进了已知的结果.     

具有可变时滞的非线性非自治差分方程的振动性及其应用

本文获得了一类具有可变时滞的非线性非自治差分方程的振动准则,建立了这类差分方程的几个线性化振动性定理,并得到了具有可变时滞的离散型非自治广义Logistic方程关于其正平衡点振动的一系列充分条件.     

一类二阶非线性泛函微分方程的振动性定理

研究了一类较为广泛的二阶非线性泛函微分方程解的振动性质.在一定条件下,利用广义黎卡提变换、积分平均技巧和分类讨论的方法建立了两个新的振动准则,改进和推广了已知的一些结果.     

非线性中立型偏微分方程解的振动性

本文考虑了一类非线性中立型偏微分方程，获得了方程的所有解振动的充分条件，同时也给出了实际应用例子。     

一类二阶非线性泛函微分方程的振动性质

研究了一类较为广泛的二阶非线性泛函微分方程解的振动性质.在一定条件下,利用广义黎卡提变换和积分平均技巧建立了方程(1)的两个新的振动准则,推广和改进了已知的一些结果.     

一类脉冲时滞抛物方程组边值问题的振动准则

考虑了一类带强迫项的脉冲时滞抛物方程组,利用脉冲时滞微分不等式,获得了该类方程组的解强迫振动的若干充分判据.     

变时滞高阶非线性中立型微分方程解的振动性、渐近性及分类

研究了变时滞高阶非线性中立型微分方程解的振动性和渐近性,并对方程解的分类进行了讨论,所得结论推广并改进了已知的一些结果.     

Some oscillation results for second-order nonlinear delay dynamic equations

This paper is concerned with oscillatory behavior of a class of second-order delay dynamic equations on a time scale. Two new oscillation criteria are presented that improve some known results in the literature. The results obtained are sharp even for the second-order ordinary differential equations.     

一类二阶非线性阻尼微分方程解的振动性质

研究了一类二阶非线性阻尼微分方程解的振动性质.在一定条件下,建立了四个新的振动性定理,推广和改进了已知的结果.     

Oscillation of Third-order Delay Dynamic Equations on Time Scales

This paper is concerned with the oscillatory behavior of a class of third-order noonlinear variable delay neutral functional dynamic equations on time scale. By using the generalized Riccati transformation and inequality technique, we establish some new oscilla- tion criteria for the equations. Our results extend and improve some known results, but also unify the oscillation of third-order nonlinear variable delay functional differential equations and functional difference equations with a nonlinear neutral term. Some examples are given to illustrate the importance of our results.     

Oscillations of Second Order Nonlinear ODE with Impulses

§ 1.Introduction　 There are a lot of good results on the oscillations of classical second-order nonlinearODE(see[1 ,2 ,3 ] ) ,but few of them are on second-order nonlinear ODE with impuls-es. Very recently,Chen and Feng[4] studied the following second-order nonlinear ODEwith impulses:x″(t) + f(t,x(t) ) =0 ,x(t+k ) =g(x(tk) ) ,x(t+0 ) =x0 ,　　t≥ t0 ,t≠ tk,k =1 ,2 ,… ,x′(t+k ) =hk(x′(tk) ) ,k =1 ,2 ,… ,x′(t+0 ) =x′0 ,(1 )and they obtained some interesting results about Eq. (1 ) .…     

三阶向量微分方程的非线性振动

本文利用Leray-Schauder连续性定理证明三阶向量微分方程非线性振荡周期解的存在性，在一定程度上推广了一些已有的结果。     

一类具偏差变元非线性偏微分方程解的振动性

研究了一类具有偏差变元的非线性偏微分方程解的振动性，获得了方程所有解振动的充分条件。     

二阶非线性微分方程的振动准则

本文给出关于二阶非线性常微分方程和时滞微分方程的一些新的振动准则．     

非线性脉冲时滞抛物型偏微分方程的强迫振动性

考虑一类具强迫项的非线性脉冲时滞抛物型偏微分方程，利用脉冲时滞微分不等式，获得了该类方程的解强迫振动的若干充分判据。     

一类二阶非线性常微分方程的初值问题

本文建立了一类二阶非线性常微分方程初值问题的一个定理,给出了它的关于解的周期性、振动性和估计式的三个推论及对应于它们的例子,指出由Thomas、DeSpantz和Lerman、Klamkin和Reid及Stare等人所考察过的一些二阶非线性常微分方程都是本文方程的特例。