Bounded Oscillation of Nonlinear Neutral Differential Equations of Arbitrary Order

The paper is concerned with oscillation properties of n-th order neutral differential equations of the form

有界时滞非线性随机微分方程解的振动性和非振性

研究了一类非线性随机时滞微分方程解的振动性和非振性,其中设定时滞可变且有界.依据该方程漂移项和扩散项的性质,证明了通过选定适当的初值,方程依概率存在正解;同时,给出了方程解几乎必然振动的一个充分条件.     

On Exact Sufficient Oscillation Conditions for Solutions of Linear Differential and Difference Equations of the First Order With Aftereffect

We obtain new unimprovable effective oscillation conditions for all solutions of linear first-order differential and difference equations with several delays. We show that known results of the kind are consequences of the new results. We reveal the reasons for the impossibility to obtain oscillation conditions for equations with several delays, as sharp as the conditions for the equation with one delay, in the case when only known approaches are used.     

Frequency Tests for the Existence and Stability of Bounded Solutions to Differential Equations of Higher Order

To study a vector-matrix differential equation of order n, the method of integral equations is used. When the Lipschitz condition holds, an existence and uniqueness theorem for a bounded solution and its estimates are obtained. This solution is almost periodic if the nonlinearity is almost periodic, and it is asymptotically Lyapunov stable if the matrix characteristic polynomial is a Hurwitz polynomial. Under a Lipschitztype condition, a theorem on the existence of at least one bounded solution is proved; among the bounded solutions, there is at least one recurrent solution if the nonlinearity is almost periodic. The equation is S-dissipative if the matrix characteristic polynomial is a Hurwitz polynomial.     

半线性二阶阻尼微分方程的振动定理

利用积分平均技巧,得到了半线性二阶阻尼微分方程[a(t)|x′(t)|α-1x′(t)]′+p(t)k(t,x(t),x′(t))x′(t)+q(t)|x(t)|α-1x(t)=0的一些新的振动定理.这些结果改进和推广了Manojlovic J V[5]的结果.     

Oscillation of Differential Equations with Deviating Arguments

1.IntroductionConsiderthefirstorderdifferentialequationwithdeviatingargumentoftheformX'(t) p(t)x(T(t))~0,t2to(1)where,p,reC([t,' co),R),tim,-ocr(t)~~andrisnondecreasingon[t,,co))'TheoscillatorybehaviourofsolutionsofEq.(1)hasbeeninvestigatedbythanyauthors.WerefertothemonographsbyErbe,KongandZhang[fi,andthepapers[2--6j.Mostoftheknownresults,however,dealwithequationswithretardedoradvancedarguments.ConsiderablylessisknownaboutthebehaviourofthesolutionsofEq.(1)whenitisofmixedtype,thatis,thedevi…     

具有振动系数的二阶非线性中立型时滞动力方程的有界振动性

研究时标T上具有振动系数的二阶非线性中立型时滞动力方程(r(t)(y(t)+p(t)y(r(t))]△)α)△+f(t,y(δ(t)))=0的有界振动性,其中p是一个定义于T上的振动函数,α＞0是两个正奇数之比.利用一种Riccati变换技术,获得了该方程所有有界解振动的几个充分条件,推广和补充了文献中要求p(t)≥ 0的一些结果,并举例说明了该文主要结果的应用.     

Oscillation Criteria for Impulsive Parabolic Differential Equations with Delay

In this paper, we investigate a class of nonlinear impulsive parabolic systems with delay. Several oscillation criteria are established for such systems subject to two different boundary conditions by employing Gauss' divergence theorem and certain impulsive delay differential inequalities.     

New Proofs of Some Results on Bounded Mean Oscillation Martingales Using Backward Stochastic Differential Equations

Using properties of backward stochastic differential equations, we give new proofs of some well-known results on bounded mean oscillation (BMO) martingales and improve some estimates of BMO norms.     

An Oscillation Theorem for Self-Adjoint Differential Equations

We consider a class of degenerate classical pseudodifferential operators on a closed curve and compute their index in Sobolev spaces. The index is expressed as a winding number by means of the principal and the subprincipal symbol. Furthermore, applications to the smoothness of solutions and the degenerate oblique derivative problem in the plane are given.     

一类n阶微分方程的振动性判别准则

给出了判断一类n阶微分方程振动性的充分条件.     

Oscillation Theorems for Quasilinear Elliptic Differential Equations

By using vector Riccati transformation and averaging technique, some oscillation criteria for the quasilinear elliptic differential equation of second order, ΣNi,j=1Di[Ψ（y）Aij（x）｜Dy｜^p-2Djy]＋p（x）f（y）=0, are obtained. These theorems extend and include earlier results for the semilinear elliptic equation and PDE with p-Laplacian.     

Oscillation of Second-Order Differential Equations with Mixed Argument

Our aim in this paper is to present a sufficient condition for the oscillation of the second order differential equation with mixed argument [formula] We compare (*) with the first order advanced equation of the form z′(t) − q₂(t)z(σ(t)) = 0.     

具变系数时滞微分方程解的振动性

研究了时滞微分方程解的振动性，其中P（t）、τ（t）非负连续．我们证明了：如果对充分大的，且，则方程（*）每一解振动．该结论改进和推广了许多已知结果．     

Computing Stability of Differential Equations with Bounded Distributed Delays

This paper deals with the stability analysis of scalar delay integro-differential equations (DIDEs). We propose a numerical scheme for computing the stability determining characteristic roots of DIDEs which involves a linear multistep method as time integration scheme and a quadrature method based on Lagrange interpolation and a Gauss–Legendre quadrature rule. We investigate to which extent the proposed scheme preserves the stability properties of the original equation. We derive and prove a sufficient condition for (asymptotic) stability of a DIDE (with a constant kernel) which we call RHP-stability. Conditions are obtained under which the proposed scheme preserves RHP-stability. We compare the obtained results with corresponding ones using Newton–Cotes formulas. Results of numerical experiments on computing the stability of DIDEs with constant and nonconstant kernel functions are presented.     

Sufficient Conditions for the Oscillation of Bounded Solutions of a Class of Impulsive Differential Equations of Second Order with a Constant Delay

Sufficient conditions are found for oscillation of bounded solutions of a class of impulsive differential equations of second order with a constant delay. Some asymptotic properties are studied for the bounded solutions.     

一类时滞微分方程解的振动准则

本文建立了一类时滞微分方程一切解振动的必要充分条件     

带有阻尼项的二阶非线性微分方程的振动性

利用一类Φ(t,s,l)型的新函数,对带有阻尼项的二阶非线性微分方程建立了新的振动准则,推广和改进了已有的一些振动结果.     

Oscillation Theorems for Second Order Nonlinear Differential Equations with Damping

In this paper, we present some new criteria for the oscillation of the differential equation with damping where p(t) and q(t) are allowed to change signs on [t₀ ∞]. These criteria are obtained by using an integral averaging technique and can be applied in some special cases in which other classical oscillation results are not applicable.