Oscillation and asymptotic behavior of third-order nonlinear neutral delay differential equations with distributed deviating arguments

This paper concerns the oscillation and asymptotic behavior of a class of third-order nonlinear neutral delay differential equations with distributed deviating arguments. By employing a generalized Riccati transformation and integral averaging technique, we establish some sufficient conditions to ensure that all solutions of the considered equations are either oscillatory or converge to zero, which extend and improve some known results in the literature.     

Oscillatory and asymptotic behavior of strongly superlinear differential equations with deviating arguments

Summary This paper deals with the oscillation and the asymptotic behavior of the solutions of superlinear differential equations with general (retarded, advanced or mixced type) deviating arguments. The equations considered involve a damping term. The results obtained extend known fundamental oscillation criteria for superlinear differential equations without damping terms and especially the recent basic reults of Kitamura and Kusano [5], and Staikos [19, 20].     

ASYMPTOTIC BEHAVIOR OF SOLUTIONS TO A CLASS OF HIGHER ORDER NONLINEAR INTEGRO-DIFFERENTIAL EQUATIONS WITH DEVIATING ARGUMENTS

In this paper,we study the asymptotic behavior of solutions to a class of higher order nonlinear integro-differential equations with deviating arguments. And some properties of the oscillatory solutions are given. Our results generalize and improve the previous results.     

OSCILLATORY AND ASYMPTOTIC BEHAVIOR OF A CLASS OF FIRST ORDER NEUTRAL DIFFERENTIAL EQUATION WITH PIECEWISE CONSTANT DELAY

The oscillatory and asymptotic behavior of a class of first order nonlinear neutral differential equation with piecewise constant delay and with diverse deviating arguments are considered. We prove that all solutions of the equation are nonoscillatory and give sufficient criteria for asymptotic behavior of nonoscillatory solutions of equation.     

Oscillation criteria for boundary value problems of high-order partial functional differential equations

In this paper, a class of boundary value problems associated with high-order partial functional differential equations with distributed deviating arguments is investigated. Some oscillation criteria of solutions to the problem are developed. Our approach is to reduce the multi-dimensional oscillation problem to a one-dimensional oscillation one by employing some integral means of solutions and introducing some parameter functions. One illustrative example is considered.     

Oscillatory Behavior of Third-order Nonlinear Differential Equations with a Sublinear Neutral Term

The authors present some new criteria for oscillation and asymptotic behavior of solutions of thirdorder nonlinear differential equations with a sublinear neutral term of the form ■where z(t) = x(t)+∫_a~b p(t, ξ)x~γ(τ(t, ξ)) dξ, 0 < γ ≤ 1. Under the conditions∫_t0~∞ r-1/α(t)dt = ∞ or∫_t0~∞ r-1/α(t)dt <∞. The results obtained here extend, improve and complement to some known results in the literature. Examples are provided to illustrate the theorems.     

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.     

一阶非线性具偏差变元脉冲微分方程

给出了具有时滞和时超的一阶非线性脉冲微分方程所有解为振动的充分条件，所得结论包含了线性情形作为其推论。     

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.     

Oscillation of coupled nonlinear discrete systems

The problem of oscillation of a second order nonlinear difference system is considered and conditions for oscillation are derived by means of a complete analysis of nonoscillatory solutions. The case of systems with deviating arguments is also analyzed, and the results are shown to significantly generalize some existing ones.     

Fite–Hille–Wintner-type oscillation criteria for second-order half-linear dynamic equations with deviating arguments

We study oscillatory behavior of solutions to a class of second-order half-linear dynamic equations with deviating arguments under the assumptions that allow applications to dynamic equations with delayed and advanced arguments. Several improved Fite–Hille–Wintner-type criteria are obtained that do not need some restrictive assumptions required in related results. Illustrative examples and conclusions are presented to show that these criteria are sharp for differential equations and provide sharper estimates for oscillation of corresponding $q$-difference equations.     

On solutions of third order nonlinear differential equations

The aim of our paper is to study oscillatory and asymptotic properties of solutions of nonlinear differential equations of the third order with deviating argument. In particular, we prove a comparison theorem for properties A and B as well as a comparison result on property A between nonlinear equations with and without deviating arguments. Our assumptions on nonlinearity f are related to its behavior only in a neighbourhood of zero and/or of infinity.     

一阶非线性具连续分布变偏差微分方程解的振动性

本文建立了两类一阶具连续分布变偏差微分方程的所有解都振动的若干充分条件,所得结果推广并改进了现有文献中的一些结果.     

Dynamics of a higher-order rational difference equation

We consider a higher order rational difference equation. Firstly, we skillfully give a sufficient and necessary condition for the existence and uniqueness of the initial value problem. And then we investigate the local stability, asymptotic behavior, periodicity and oscillation of solutions for the difference equation. Finally, we give some numerical simulations to illustrate our results.     

On the oscillation properties of first-order impulsive differential equations with a deviating argument

For first order linear impulsive differential equations with a deviating argument a number of oscillation theorems are proved (of the type of the Sturmian Theorem). Various criteria for oscillation or non-oscillation of the solutions of these equations are found. The oscillatory properties of some concrete equations of the type considered are investigated. Supported by the Bulgarian Ministry of Education, Science and Technologies under Grant MM-422.     

关于高阶变系数非线性时滞泛函微分方程

本文中我们研究了如下高阶非线性时滞泛函微分方程解的振动性与渐适性．推广了目前关于线性高阶方程的相应结果．某些条件尚属首次给出．     

带有极大值项的中立型差分方程的振动性和非振动性

本文考虑带有极大值项的一阶中立型差分方程,获得了所有解振动的充分条件,同时也研究了非振动解的渐近性质。     

ASYMPTOTIC AND OSCILLATORY BEHAVIOR OF NTH ORDER NEUTRAL DIFFERENCE EQUATION WITH FORCED TERM

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OSCILLATION AND ASYMPTOTIC BEHMIOR OF SECOND ORDER NONLINEAR NEUTRAL DIFFERENCE EQUATION

1IntroductionLetR=(--co,co),R =[0,co)andN={l,2,'.},considerthesecondordernonlillearneutraldifferenceequationThesubjectissupportedbyHeilongjiangProvinceNaturalScienceF(,undatfonN,l,,hi6N,andletk~ma-c{li,hifiEIm,jeI.}.ThefunctionfiisrealvaluedcontinuousonR…     

Asymptotic analysis of oscillating parametric integrals and ordinary boundary value problems at resonance

This paper deals with boundary value problems whose nonlinear part involves periodic functions and such that the linear part has a one-dimensional solution space. We shall study the existence and multiplicity of solutions using various methods of Nonlinear Analysis such as the Lyapunov-Schmidt reduction and methods of critical point theory. The proofs are based on some general results on the oscillation and asymptotic behavior of certain parametric integrals.