时间尺度上具阻尼项的二阶半线性时滞动力方程的振动准则(Ⅱ)

本文讨论一类具阻尼项的二阶半线性时滞动力方程解的振动性质, 利用广义Riccati 变换和不等式技巧. 在一定条件下, 建立了四个新的振动准则, 改进和推广了已知的一些结果.     

时间尺度上具阻尼项的二阶半线性时滞动力方程振动性的新结果

本文讨论一类具阻尼项的二阶半线性时滞动力方程解的振动性质, 利用广义Riccati 变换和不等式技巧, 在一定条件下, 建立了4 个新的振动准则, 其结果改进和推广了已知的一些结果.     

含连续时滞和阻尼项的二阶半线性微分方程解的振动性

研究了一类含有连续分布时滞和阻尼项的二阶半线性微分方程运用Riccati变换和H函数方法,获得了该方程解的振动性的若干充分条件.     

时间尺度上具阻尼项的二阶半线性多时滞动力方程的振动准则

讨论一类时间尺度上具阻尼项的二阶半线性多时滞动力方程解的振动性,利用广义Riccati变换和不等式技巧,在一定条件下,建立了新的振动准则,这些准则改进和推广已知的一些结论.     

时间测度链上具正负系数的二阶阻尼动力方程的振动准则

研究了时间测度链上一类具正负系数和阻尼项及非线性中立项的二阶变时滞非线性动力方程的振荡性.利用时间测度链上的有关理论及广义Riccati变换,结合大量不等式技巧,建立了该方程若干新的振动准则,这些准则不仅推广和改进了一些已知的结果,而且在时间测度链上统一了二阶非线性时滞阻尼微分方程和二阶非线性时滞阻尼差分方程的振动性质.     

时间尺度上一类二阶具阻尼项的半线性中立型时滞动力方程的振动性

借助时间尺度的有关理论,运用Riccati变换技巧,平均函数技术及不等式技巧,研究了时间尺度上一类二阶具阻尼项的半线性中立型时滞动力方程的振动性,给出该类方程振动的几个充分条件,推广并改进了已有的某些结果.     

具分布时滞和阻尼项的偶阶半线性中立型微分方程的振动性

研究一类具分布时滞和阻尼项的偶阶半线性中立型微分方程解的振动性质,利用广义Riccati变换和积分平均技巧得到方程一切解均为振动的若干新的振动准则,推广、改进和统一了新近文献中的某些结果.     

具连续分布时滞的半线性阻尼微分方程的振动性

研究一类具连续分布时滞的二阶半线性阻尼微分方程,利用Yang不等式、广义Riccati变换和H函数,给出了此类方程所有解振动新的充分条件,所得结果推广和改进了已有文献的结果.     

二阶非线性阻尼泛函差分方程的振动性定理

研究一类具阻尼项的二阶广义Emden-Fowler型变时滞的泛函差分方程的振动性,通过引入二重序列H_(n,s),并结合一些经典不等式,获得了该类差分方程振动的4个新的充分条件,所得结果反应了时滞项和阻尼项在差分系统振动中的影响作用.     

一类二阶半线性时滞微分方程解的振动性质

研究了一类二阶半线性时滞微分方程解的振动性质.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.     

Oscillation of second-order half-linear delay dynamic equations with damping on time scales

By using the generalized Riccati transformation and the inequality technique, we establish a few new oscillation criterions for certain second-order half-linear delay dynamic equations with damping on a time scale. Our results extend and improve some known results, but also unify the oscillation of the second-order half-linear delay differential equation with damping and the second-order half-linear delay difference equation with damping.     

Interval criteria for second-order super-half-linear functional dynamic equations with delay and advance arguments

Interval oscillation criteria are established for second-order forced super half-linear dynamic equations on time scales containing both delay and advance arguments, where the potentials and forcing term are allowed to change sign. Four discrete examples are provided to illustrate the relevance of the results. The theory can be applied to second-order dynamic equations regardless of the choice of delta or nabla derivatives.     

Oscillation Theorems for Fourth-Order Half-Linear Delay Dynamic Equations with Damping

This article is concerned with oscillatory behavior of a class of fourth-order half-linear delay dynamic equations with damping on a time scale. Some new oscillation criteria are established.     

Oscillation of second-order nonlinear delay dynamic equations with damping on time scales

By using the generalized Riccati transformation and the inequality technique, we establish some new oscillation criteria for the second-order nonlinear delay dynamic equations with damping on a time scale. Our results extend and improve some known theorems, but also unify the oscillation of the second-order nonlinear delay differential equation with damping and the second-order nonlinear delay difference equation with damping.     

Critical oscillation constant for half-linear differential equations with periodic coefficients

We compute explicitly the oscillation constant for certain half-linear second-order differential equations involving periodic coefficients. If these periodic functions are constants, our results reduce to the well-known oscillation constants for half-linear Euler and Riemann–Weber differential equations.     

Linearization of second-order superlinear oscillation theorems

In this paper, for second-order superlinear differential equations, we present new oscillation criteria. Our results involve comparison with related linear and half-linear second-order differential equations, so that the known oscillation theorems from literature can be employed directly.     

Sharp oscillation criteria for second-order neutral delay differential equations

This paper is a continuation of a recent work by the authors on the oscillatory properties of second-order half-linear neutral delay differential equations. Providing a new apriori bound for a nonoscillatory solution, we present a new oscillation criterion, which essentially improves the existing ones. In a particular nonneutral case, the obtained oscillation constant is unimprovable.