高阶变系数函数方程的振动性

建立了一类高阶非线性变系数函数方程一切解振动的几个充分条件,并且给出了在差分方程中的若干应用.结果全面推广了某些文献的结果.     

高阶中立型时滞差分方程解的振动性

研究了一类具有变系数的高阶中立型时滞差分方程解的振动性，给出了其有界解振动的两个充分条件。     

一类高阶变系数线性非齐次微分方程的解

利用高阶变系数之间的关系,通过适当的线性变换,得到了五阶变系数线性非齐次方程常系数化的条件,给出了一类高阶变系数线性非齐次微分方程的新解法.     

高阶拟线性变时滞差分方程解的振动性和渐近性

对一类高阶拟线性变时滞差分方程进行了研究,给出了解振动或者单调趋近了0的一些充分性结论,同时给出例子验证其有效性.所得结果推广了已有结果.     

一类中立型泛函微分方程的振动准则

考虑了一类具连续偏差变元的高阶中立型方程,得到了该类方程的振动准则,所得结果推广了以往的相应结果,并给出了具体例子.     

一类高阶中立型方程的强迫振动性

讨论了一类具有偏差变元的高阶中立型方程,给出了该类方程解振动的充分条件.     

高阶变系数线性微分方程的一些新的可积类型

借助双变换—未知函数的变换和自变量的变换,将几类高阶变系数线性微分方程化为相应的常系数线性微分方程,从而顺利求得它们的通解,得到了变系数线性微分方程新的可积类型,所得结果极大地推广了著名的Euler方程及前人的一些的工作,并给出了相应的实例加以佐证.     

一阶偏差变元微分方程振动的充要条件及应用

本文中,首先给出了一阶线性偏差变元微分方程所有解振动的充分必要条件,然后应用这个结果研究了具正负系数的中立型微分方程的振动性.     

一类高阶非线性泛函微分方程的振动性

给出了一类高阶非线性泛函微分方程的若干振动定理,推广了文献中的一些振动结果.     

带有多个变滞量的二阶中立型差分方程振动性判据

研究了一类较广泛的带有多个变滞量的变系数的二阶中立型差分方程的振动性 ,给出了该类方程振动及差分算子△振动的判据 .     

高阶变系数函数方程的非振动解

给出一类高阶非线性函数方程的一些新的非振动准则,并且给出了在差分方程中的若干应用,结果改进和推广了近期文献的某些结果.     

Oscillation criteria for certain third-order variable delay functional dynamic equations on time scales

The oscillation of certain third-order nonlinear variable delay functional dynamic equations with nonlinear neutral on time scales is discussed in this article. By using the generalized Riccati transformation and a lot of inequality techniques, some new oscillation criteria for the equations are established. Many of the results are new for the corresponding third-order difference equations and differential equations are as special cases. Some examples are given to illustrate the importance of our results.     

Oscillations of solutions of second order quasilinear differential equations with impulses

Some Kamenev-type oscillation criteria are obtained for a second order quasilinear damped differential equation with impulses. These criteria generalize and improve some well-known results for second order differential equations with /and without impulses. In addition, new oscillation criteria are also obtained to generalize and improve known results. Two examples of applications are given to illustrate the theory.     

Oscillatory applications of some fourth-order differential equations

Fourth-order advanced differential equations naturally appear in models concerning physical, biological, chemical phenomena applications. The aim of this paper is to study the oscillatory properties of fourth-order advanced differential equations with p-Laplacian like operators. We obtain some oscillation criteria for the equation by the theory of comparison. The obtained results improve the well-known oscillation results in the literature. Some examples to illustrate the results are given.     

偶次中立型泛函微分方程解的振荡性

研究偶次中立型泛函微分方程，给出了该微分方程解的振荡性的充分条件,得到了一些新的结果并给出了一些示例。     

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.     

On the oscillation of some linear difference equations with periodic coefficients

Some linear difference equations with periodic coefficients (not necessarily nonnegative) are considered. Necessary conditions and sufficient conditions for the oscillation of the solutions are established. Conditions under which all nonoscillatory solutions tend to zero at ∞ are also presented. The results obtained are the discrete analogues of the oscillation results for some linear delay differential equations with periodic coefficients, which were given earlier by the second author [Oscillations of some delay differential equations with periodic coefficients, J. Math. Anal. Appl. 162 (1991) 452–475].     

三阶非线性时滞微分方程振动性的新准则

研究了一类三阶非线性时滞微分方程的振动性问题, 利用算子和积分技巧给出了该类方程不存在A型解(或B型解)的判定条件．进而借助适当的比较定理, 得到了该类方程振动的几个新的充分条件, 所得结果推广和改进了最近文献中的结果, 并充分反映了时滞在方程振动中的影响作用．主要结果由实例加以阐述.     

Oscillation of a class of partial functional population model

This paper is concerned with the oscillation of a class of partial functional population model, and some sufficient conditions for all positive solutions of the model to oscillate about the positive equilibrium are obtained. The approach is based on the upper- and lower-solution method of the partial functional differential equations and the oscillation theory of the functional differential equation. Moreover, some numerical simulations are also given to illustrate our results.     

Oscillation and Nonoscillation in Delay or Advanced Differential Equations and in Integrodifferential Equations

Some new oscillation and nonoscillation criteria are given for linear delay or advanced differential equations with variable coefficients and not (necessarily) constant delays or advanced arguments. Moreover, some new results on the existence and the nonexistence of positive solutions for linear integrodifferential equations are obtained.