非线性力学中的比较原理与应用

本文研究一类无限维非线性力学系统,即具有有限时间滞后的泛函微分方程描述的系统.建立了一类ЛРЧ型比较原理,并将其应用于时间滞后系统的平均原理及其在两种度量下的实用稳定性问题.     

具滞后中立型线性大系统的指数稳定性

采用具有加权向量范数型李雅谱诺夫函数，对具滞后中立型线型大系统进行模型集结，得到集结系统；再运用比较原理与时域中的微分积分不等式，讨论相应集结系统，从而通过集结系统的稳定性，获得了具滞后中立型大系统的指数稳定性。     

滞后型Филиппов系统解的整体存在性

本文利用比较原理讨论滞后型系统解的整体存在性,推广了文[2][4]的部分结果,得到一系列充分判别准则.     

泛函微分不等式与时滞随机系统（Ⅲ）：有界性判据

一、引言 由随机泛函微分方程描述的时滞随机系统的定性分析已由Ito和Nisio,Ladde,Sasagawa等讨论过,但他们均没有利用比较原理研究时滞随机系统的p阶均值有界性.本文的目的,就是应用作者建立的时滞随机系统的比较原理,给出时滞随机系统的p     

网络化非周期采样控制系统的主动时间滞后控制:随机脉冲切换系统方法

研究了一类带有随机丢包的非周期采样网络化控制系统的镇定问题.不同于传统观点往往将时滞看作系统稳定性的消极因素,考虑时间滞后对系统稳定性的积极影响,并提出一个新颖的主动时间滞后控制方法来镇定该系统.为了分析时间滞后控制的积极作用并获得较低保守性的结论,首先把带随机丢包的非周期采样系统建模为带固定切换率的随机脉冲切换系统,...     

一类具有脉冲效应和Beddington-DeAngelis功能函数的非自治随机捕食-被捕食系统

建立了一类具有Beddington-DeAngelis功能函数的非自治脉冲随机捕食-被捕食系统.通过It?公式和随机微分方程比较原理,证明了该系统解的存在唯一性和有界性以及系统趋于灭绝的条件.     

具滞后超中立型定常线性大系统的指数稳定性

采用具有加权向量范数型Lyapunov函数，对具滞后超中立型线性大系统进行模型集结，得到集结系统；再运用原理与时域中的微分积分不等式，讨论相应集结系统，通过集结系统的稳定性，获得了具滞后超中立型大系统的指数稳定性．     

比较原理与Markov调制的随机时滞系统的稳定性

建立了Markov调制的具可变时滞的随机非线性系统的比较原理, 并用比较原理给出了系统依概率稳定、概率渐近稳定、 p阶均值稳定、 p阶均值渐近稳定、 p阶均值指数稳定的判别准则.最后举例说明了文中结果的应用.     

具有随机干扰的时滞车辆跟随控制

考虑信息传输和车辆动力学行为对控制指令具有时间滞后因素和车辆动力学系统建模中忽略的随机因素,建立了一类具有时间滞后的随机车辆跟随系统,并研究了该系统的稳定性和控制器设计.根据Ito(伊藤)随机微分方程建立随机车辆动力学模型.利用滑模控制设计了系统的控制策略,并运用系统的稳定性判据得到了系统控制参数的收敛区域.数值仿真试验结果表明:各跟随车辆的加速度、速度和位移等状态能在较短的时间内迫近领头车辆;各车辆的车间距误差有较快的收敛速度,均能在10 s内收敛于0.     

具有多个参数扰动的随机恒化器模型的持久性与灭绝性

考虑了一类营养基输入浓度和营养转化率同时受到白噪声干扰的随机恒化器模型.首先应用随机微分方程的比较原理证明了模型正解的全局存在性和唯一性.其次通过构造Lyapunov函数,利用伊藤公式和随机微分方程的一些结论研究了随机系统的持久性和灭绝性.最后通过数值模拟验证了所得结果的正确性.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

CONTENTS OF VOLUME 30

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Instructions for contributions

正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with     

Journal of Mathematical Research with Applications Guide for Authors

正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics.     

Staircase transportation problems with superadditive rewards and cumulative capacities

A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6].