APPROXIMATING ANALYSIS OF A KIND OF REPAIRABLE STANDBY SYSTEMS

ＬＩＷＥＩ（李伟）；ＣＡＯＪＩＮＨＵＡ（曹晋华）（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，ｔｈｅＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｂｅｉｊｉｎｇ１０００８０，ＣｈｉｎａａｎｄＡｓｉａ－ＰａｃｉｆｉｃＯｐｅｒａｔｉｏ...     

K-Group of Operater Algebras and Strongly Irreducible Decomposition of Operators

Ｋ┐ＧｒｏｕｐｏｆＯｐｅｒａｔｅｒＡｌｇｅｂｒａｓａｎｄＳｔｒｏｎｇｌｙＩｒｒｅｄｕｃｉｂｌｅＤｅｃｏｍｐｏｓｉｔｉｏｎｏｆＯｐｅｒａｔｏｒｓＣａｏＹａｎｇ（曹阳）ＦａｎｇＪｕｎｓｈｅｎｇ（房军生）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，Ｊ...     

C-cosine Operator Functions and the Second Order Abstract Cauchy Problem

Ｃ－ｃｏｓｉｎｅＯｐｅｒａｔｏｒＦｕｎｃｔｉｏｎｓａｎｄｔｈｅＳｅｃｏｎｄＯｒｄｅｒ　ＡｂｓｔｒａｃｔＣａｕｃｈｙＰｒｏｂｌｅｍＷａｎｇＨａｉｙａｎ（王海燕）（ＤｅｐａｒｔｍｅｔｎｏｆＭａｔｈｅｍａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ，Ｓｏｕｔｈｅａｓｔ...     

THE CONTINUOUS CASTING PON α-BLOCH FUNCTIONS AND VMOA

ＯＮα－ＢＬＯＣＨＦＵＮＣＴＩＯＮＳＡＮＤＶＭＯＡ￥（赵如汉）ＺｈａｏＲｕｈａｎ（ＷｕｈａｎＩｎｓｔｉｔｕｔｅｏｆＭａｔｈｅｍａｔｉｃａｌＳｃｉｅｎｃｅｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｗｕｈａｎ４５００７１，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：Ｉｎｔｈｉ...     

C-COSINE OPERATOR FUNCTIONS

Ｃ－ＣＯＳＩＮＥＯＰＥＲＡＴＯＲＦＵＮＣＴＩＯＮＳ￥ＨｕａｎｇＴｉｎｇｗｅｎ（黄廷文）＆ＨｕａｎｇＦａｌｕｎ（黄发伦）（ＳｉｃｈｕａｎＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａｃｔ：Ｉｎｔｈｉｓｐａｐｅｒ，ｗｅｉｎｖｅｓｔｉｇａｔｅｔｈｅｂａｓｉｃｐｒｏｐｅ...     

A Note on the Choice of Optimal Scores for Ordinal Data

ＡＮｏｔｅｏｎｔｈｅＣｈｏｉｃｅｏｆＯｐｔｉｍａｌＳｃｏｒｅｓｆｏｒＯｒｄｉｎａｌＤａｔａ＊）ＳｈｉＮｉｎｇｚｈｏｎｇ（史宁中）ａｎｄＧａｏＷｅｉ（高巍）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＮｏｒｔｈｅａｓｔＮｏｒｍａｌＵｎｉｖｅｒｓｉ...     

The U~* -property of Orlicz Spaces

Ａｂｓｔｒａｃｔ：ＦｏｒＯｒｌｉｃｚｓｐａｃｅｓ，ｔｈｅｃｒｉｔｅｒｉａｏｆＵ＊－ｐｒｏｐｅｒｔｙａｒｅｇｉｖｅｎ．Ｋｅｙｗｏｒｄｓ：ＯｒｌｉｃｚＳｐａｃｅｓ；Ｕ－ｐｒｏｐｅｒｔｙ；Ｕ＊－ｐｒｏｐｅｒｔｙ（王廷辅）（计东海）Ｌｅｔ（Ｘ，１１＇１１）ｂ...     

On Weak Topology of Sequence Orlicz Spaces

ＯｎＷｅａｋＴｏｐｏｌｏｇｙｏｆＳｅｑｕｅｎｃｅＯｒｌｉｃｚＳｐａｃｅｓＣｈｅｎＳｈｕｔａｏ（陈述涛）（ＨａｒｂｉｎＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｈｅｉｌｏｎｇｊｉａｎｇ，１５００８０）ＳｕｎＨｕｉｙｉｎｇ（孙慧颖）（ＨａｒｂｉｎＩｎｓｔｉｔｕｔ...     

On Unitary Equivalence of Analytic Toeplitz Operators

ＯｎＵｎｉｔａｒｙＥｑｕｉｖａｌｅｎｃｅｏｆＡｎａｌｙｔｉｃＴｏｅｐｌｉｔｚＯｐｅｒａｔｏｒｓＤｉｎｇＸｕａｎｈａｏ（丁宣浩）（ＤａｘｉａｎＴｅａｃｈｅｒ＇ｓＣｏｌｅｇｅ，Ｄａｘｉａｎ，Ｓｉｃｈｕａｎ，６３５０００）ＡｂｓｔｒａｃｔＩｎｔｈｉｓｐａｐ...     

THE PROOF OF A.M. FINK′S CONJECTURE

ＴＨＥＰＲＯＯＦＯＦＡ．Ｍ．ＦＩＮＫ′ＳＣＯＮＪＥＣＴＵＲＥ￥ＺｅｎｇＷｅｉｙａｏ（曾唯尧）（ＨｕｎａｎＬｉｇｈｔＩｎｄｕｓｔｒｉａｌＣｏｌｌｅｇｅ）Ａｂｓｔｒａｃｔ：ＩｎｔｈｉｓｐａｐｅｒｗｅｗｉｌｌｓｈｏｗＡ．Ｍ．Ｆｉｎｋ′ｓｃｏｎｊｅｃｔｕｒｅ...     

Oscillation criteria for first-order neutral differential equations

This paper discusses a class of first-order neutral differential equations with variable coefficients and variable deviations. A series of sufficient conditions are established for all solutions of the equations to be oscillatory, and some of the conditions are sharp.     

一类变系数线性微分方程及其解

根据常系数线性微分方程的求解原理,通过一个适当变换,研究了一类变系数线性微分方程及其解的问题,从而可以得到这类方程在特征根都是互异单根时的解法和通解,并对三阶方程的各种情况进行了较为详尽的讨论.     

Dynamics and exact solutions of non-evolutionary partial differential equations

The article presents a new method for constructing exact solutions of non-evolutionary partial differential equations with two independent variables. The method is applied to the linear classical equations of mathematical physics: the Helmholtz equation and the variable type equation. The constructed method goes back to the theory of finite-dimensional dynamics proposed for evolutionary differential equations by B. Kruglikov, O. Lychagina and V. Lychagin. This theory is a natural development of the theory of dynamical systems. Dynamics make it possible to find families that depends on a finite number of parameters among all solutions of PDEs. The proposed method is used to construct exact particular solutions of linear differential equations (Helmholtz equations and equations of variable type).     

An indirect variable transformation approach and Jacobi elliptic solutions to Korteweg de Vries equation

Based on a variable change and the variable separated ODE method, an indirect variable transformation approach is proposed to search exact solutions to special types of partial differential equations (PDEs). The new method provides a more systematical and convenient handling of the solution process for the nonlinear equations. Its key point is to reduce the given PDEs to variable-coefficient ordinary differential equations, then we look for solutions to the resulting equations by some methods. As an application, exact solutions for the KdV equation are formally derived.     

Some remarks on extremal solutions of multivalued differential equations

In this paper, we consider extremal solutions of multivalued differential equations, i.e., solutions that steer to the boundary of the attainable set. Multivalued differential equations arise in a natural way from control systems governed by ordinary differential equations that have a variable control-constraint set. Extremal solutions of multi-valued differential equations are important in the study of the optimal control of such systems. We give conditions under which extremality of a solution at a certain time implies extremality of the solution at all previous times where it is defined. Necessary conditions for extremality are also obtained. We treat both the time-dependent case and the time-independent case.     

Stability of solutions to differential equations with several variable delays. I

We consider a class of scalar linear differential equations with several variable delays and constant coefficients. A family of equations of the class is defined by coefficients and maximum admissible values of delays. We obtain conditions that are necessary and sufficient for the stability of solutions to all equations of the family. It is ascertained that the conditions are determined entirely by properties of the solution to the initial problem for an autonomous equation that belongs to the family. Some alternatives of required conditions are obtained in the form of estimates for solutions to autonomous equations in a finite interval.     

Asymptotics of solutions of difference equations with delays

We consider a linear scalar difference equation with several variable delays and constant coefficients. The coefficients and maximum admissible values of delays are supposed to be the set of parameters that define a family of equations of the investigated class. We obtain effective necessary and sufficient conditions of the uniform and exponential stability of solutions to all equations of the family, as well as the conditions of the sign-definiteness and monotonicity of stable solutions.     

Die Polynomlösungen spezieller partieller Differentialgleichungen

One of the main problems in the theory of orthogonal polynomials in several variables is the determination of partial differential equations which have the given polynomials as their solutions. In this note, we consider partial differential equations which are two-dimensional generalizations of the classical differential equation for the Chebyshev polynomials in one variable and we will give conditions for its polynomial solutions. In addition, we will be able to determine all polynomials of a given class which are solutions of the partial differential equation under consideration. In the last section, we establish a connection between the different polynomial solutions.     

Burgers and Black–Merton–Scholes equations with real time variable and complex spatial variable

The purpose of this article is to study the Burgers and Black–Merton–Scholes equations with real time variable and complex spatial variable. The complexification of the spatial variable in these equations is made by two different methods which produce different equations: first, one complexifies the spatial variable in the corresponding (real) solution by replacing the usual sum of variables (translation) by an exponential product (rotation) and secondly, one complexifies the spatial variable in the corresponding evolution equation and then one searches for analytic and non-analytic solutions. By both methods, new kinds of evolution equations (or systems of equations) in two dimensional spatial variables are generated and their solutions are constructed.     

EXACT SOLUTIONS OF THE VARIABLE COEFFICIENT KdV AND SG TYPE EQUATIONS

In this paper,the variable cofficient KdV equation with dissipative loss and nonuniformity terms and the variable coefficient SG equation with nonuniformity term are studied. The exact solutions of the KdV and SG equations are obtained. In particular,the soliton solutions oftwo equations are found.