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．     

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。     

一类具有变量时滞的中立型大系统C_1-稳定性

本文首先给出了一个向量积分不等式,并通过它讨论了一类具有滞后的中立型大系统的C_1-稳定性,然后得到一些新的稳定性的充分条件。     

Volterra积分微分方程大系统的渐近稳定性

一个大系统通常是由若干孤立子系统经过互联而构成的,所以有关大系统的问题,可以通过对每个孤立子系统,以及它们之间的互联关系的分析来解决。由常微分方程所描述的大系统和由差分方程描述的离散大系统平衡态的稳定性问题,已有了许多成果。但对Volterra积分微分方程大系统的讨论还不多见。这里拟采用向量V-泛函及微分不等式方法讨论它的渐近稳定性。     

线性Volterra系统V泛函的构造及其应用

Ｖ泛函的构造是讨论Ｖｏｌｔｅｒｒａ积分微分系统稳定性的关键．近十年来，不少作者在Ｌｉａｐｕｎｏｖ泛函构造方面作了不少努力，但对一般的线性Ｖｏｌｔｅｒｒａ系统，还是没有构造Ｌｉｓｐｕｎｏｖ泛函通用而有效的方法．本文通过具体求解一个线性偏微分方程的方法来确定Ｖ泛函，得到了更广泛的Ｌｉａｐｕｎｏｖ泛函以及变号Ｖ泛函．同时，利用这些Ｖ泛函对线性Ｖｏｌｔｅｒｒａ系统的实用稳定性与Ｌｉｓｐｕｎｏｖ稳定性作了讨论．     

一类Volterra积分微分系统的稳定性

本文应用大系统的定性分析方法,通过作二次型加积分项的 Liapunov 泛函,讨论了一类 Volterra 积分微分系统平凡解的稳定性与一致渐近稳定性,由于作了一些更为细致的处理,我们得到了比文[1—2]的相应结果适应性更为广泛的充分性准则,并扩充了以往的研究工作。     

变系数时滞积微分系统的稳定性

本文给出了变系数时滞积微分系统稳定性的积分判据,利用一个简单的降阶方法并结合积分判据,给出了积微分大系统稳定性的一个充分性判据。文末用实例说明了方法的有效性。     

随机选择修理工的可修复系统指数稳定性分析

讨论了一个随机选择修理工的可修复系统解的指数稳定性,首先通过对积分微分方程组描述的可修复系统生成的系统算子的本质谱的增长性约束和扰动后本质谱半径的变化情况进行分析,进而得到了可修复系统解的指数稳定性.     

粘弹性板动力稳定性分析中的两模态Galerkin逼近

利用最大Liapunov指数分析法以及其它数值和解析的动力学方法,研究了大挠度粘弹性薄板的动力稳定性。材料的行为由Boltzmann叠加原理描述。采用Galerkin方法将原积分-偏微分模型简化为两模态的近似积分模型,而通过引进新变量,该近似积分模型可进一步化为一个常微分模型。数值比较了1-模态和2-模态截断系统的动力学性质,讨论了面内周期激励下材料的粘弹性性质、加载的幅度和初值对板动力学行为的影响。     

中立型积分微分方程的稳定性

本文研究了一类中立型积分微分方程的稳定性，在相应的常微分系统完全可不稳定的条件下，获得了稳定性判别准则．     

大范围市场系统的稳定性分析

本文利用 L iapunov泛函的加权研究具时间滞后效应的大范围市场系统的稳定性 ,得到系统的均衡价格为一致渐近稳定的充分条件 ,它们推广或改进了文献 [1,4 ,5 ]的相应结果     

Approximate solutions of linear Volterra integral equation systems with variable coefficients

In this paper, a new approximate method has been presented to solve the linear Volterra integral equation systems (VIEs). This method transforms the integral system into the matrix equation with the help of Taylor series. By merging these results, a new system which corresponds to a system of linear algebraic equations is obtained. The solution of this system yields the Taylor coefficients of the solution function. Also, this method gives the analytic solution when the exact solutions are polynomials. So as to show this capability and robustness, some systems of VIEs are solved by the presented method in order to obtain their approximate solutions.     

Symmetry of integral equation systems on bounded domains

In this paper, we investigate the symmetry of domains and solutions of integral equation systems on bounded domains. Under some natural integrability conditions, we prove that the domains are balls, all positive solutions of systems are radially symmetric and monotone decreasing with respect to the radius.     

Invariant imbedding and the resolvent of Fredholm integral equations with semi-degenerate kernels

In many branches of astrophysics, physics, biology, and nuclear engineering, the underlying functional equation is a Fredholm integral equation. In this paper, it is shown that Fredholm integral equations with semi-degenerate kernels can be reduced to initial-value problems for systems of ordinary differential equations using an interesting formula for the Fredholm resolvent. Semi-degenerate kernels are encountered in many applications in the foregoing fields. This procedure facilitates the computational solution of the two-point boundary-value problem by both analog and digital computers.     

Symmetry of integral equation systems with Bessel kernel on bounded domains

In this paper, we investigate the symmetry of integral equation systems with Bessel kernel on bounded domains. Under some natural integrability conditions, we prove that the domains are balls and all positive solutions are radially symmetric and monotonic decreasing.     

Antiplane shear deformations in a linear theory of elasticity with microstructure

In this paper, we solve fundamental boundary value problems in a theory of antiplane elasticity which includes the effects of material microstructure. Using the real boundary integral equation method, we reduce the fundamental problems to systems of singular integral equations and construct exact solutions in the form of integral potentials.     

An L refined projection approximate solution of the radiation transfer equation in stellar atmospheres

This paper deals with the numerical approximation of the solution of a weakly singular integral equation of the second kind which appears in Astrophysics. The reference space is the complex Banach space of Lebesgue integrable functions on a bounded interval whose amplitude represents the optical thickness of the atmosphere. The kernel of the integral operator is defined through the first exponential-integral function and depends on the albedo of the media. The numerical approximation is based on a sequence of piecewise constant projections along the common annihilator of the corresponding local means. In order to produce high precision solutions without solving large scale linear systems, we develop an iterative refinement technique of a low order approximation. For this scheme, parallelization of matrix computations is suitable.     

MULTILEVEL AUGMENTATION METHODS FOR SOLVING OPERATOR EQUATIONS

We introduce multilevel augmentation methods for solving operator equations based on direct sum decompositions of the range space of the operator and the solution space of the operator equation and a matrix splitting scheme. We establish a general setting for the analysis of these methods, showing that the methods yield approximate solutions of the same convergence order as the best approximation from the subspace. These augmentation methods allow us to develop fast, accurate and stable nonconventional numerical algorithms for solving operator equations. In particular, for second kind equations, special splitting techniques are proposed to develop such algorithms. These algorithms are then applied to solve the linear systems resulting from matrix compression schemes using wavelet-like functions for solving Fredholm integral equations of the second kind. For this special case, a complete analysis for computational complexity and convergence order is presented. Numerical examples are included to demonstra     

Parameter estimation in smooth empirical processes

In this paper we derive almost sure representation theorems and limit distribution results for the solution of a general parametric equation of integral type evaluated at the empirical distribution function. In particular, these are applied to R-, L- and (scale invariant) M-estimates as well as CvM minimum distance estimates. Also some new types of estimates (of location) are proposed.