数学季刊杂志 省级期刊

Weighted Composition Operators between Hardy Spaces on the Unit Ball

作者：XUHui-ming; LIUTai-shun 刊期：2004年第02期

We consider the weighted composition operators between Hardy spaces on the unit ball, and obtain some sufficient and necessary conditions of bounded or compact weighted composition operators. We also prove that the operator from H^1 to H^1 is compact if and only if it is weakly compact. Meanwhile, we get the analogue...

Eigenvalues of Spin^c Dirac Operator

作者：FENGXiu-fang; LANShe-yun; DINGLu; ZHENGZhu-jun 刊期：2004年第02期

In this paper we research the lower bound of the eigenvalue of Spin^c Diracoperator on the Spin^c manifold. By the Weisenboeck formula, we get an estimate of it, then following the idea of Th Friedrich [2] and X Zhang [6]. We get a finer estimate of it. As an application, we give a condition when the Seiberg-Witten e...

Statistical Analysis for the Birnbaum-Saunders Fatigue Life Distribution under Type-Ⅱ Bilateral Censoring and Multiply Type-Ⅱ Censoring

作者：WANGRong-hua; FEIHe-liang 刊期：2004年第02期

In present paper, we obtain the inverse moment estimations of parameters of the Birnbaum-Saunders fatigue life distribution based on Type-Ⅱ bilateral censored samples and multiply Type-Ⅱ censored sample. In this paper, we also get the interval estimations of the scale parameters.

Chromatic Uniqueness of the Complement of Tm（1,4,m-6）

作者：ZHANGShu-min 刊期：2004年第02期

In the paper, we prove that the complement of Tm(1,4,m-6)(m> 10) is chromatically unique if and only if m≠5k(k≥2).

Convergence Analysis on a Class of Nonmonotone Conjugate Gradient Methods without Sufficient Decrease Condition

作者：DUShou-qiang; CHENYuan-yuan 刊期：2004年第02期

In [3] Liu et al. investigated global convergence of conjugate gradient methods.In that paper they allowed βk to be selected in a wider range and the global convergence of the corresponding algorithm without sufficient decrease condition was proved. This paper investigates global convergence of nonmonotone conjugate ...

Geometric Properties of AR（q） Nonlinear Regression Models

作者：LIUYing-ar; WEIBo-cheng 刊期：2004年第02期

This paper is devoted to a study of geometric properties of AR(q) nonlinear regression models. We present geometric frameworks for regression parameter space and autoregression parameter space respectively based on the weighted inner product by fisher information matrix. Several geometric properties related to statis...

On the Sum of Two Piatetski-Shapiro Primes

作者：MENGXian-meng 刊期：2004年第02期

A Robin Problem for Quasi-linear System

作者：0UYANGCheng 刊期：2004年第02期

In this paper, a Robin problem for quasi-linear system is considered. Under the appropriate assumptions, the existence of solution for the problem is proved and the asymptotic behavior of the solution is studied using the theory of differential inequalities.

The Almost Periodic Solution on a Lienard Equation

作者：ZHUHuan-ran 刊期：2004年第02期

By using exponential dichotomies and Liapunov function method, we have studied the existence of almost periodic solutions on a Lienard system and have obtained some simple sufficient condition.

Constructing Pandiagonal Snowflake Magic Squares of Odd Order

作者：ZHANGShi-de; HUQing-wen; WANGJi-zhao 刊期：2004年第02期

The constructional methods of pandiagonal snowflake magic squares of orders 4m are established in paper [3]. In this paper, the constructional methods of pandiagonal snowflake magic squares of odd orders n are established with n = 6m+l, 6m+5 and 6m+3, m is an odd positive integer and m is an even positive integer 9|6...

On the Asymptotic Behavior of Certain Second Order Differential Equations

作者：XUZhi-ting; XIAYong 刊期：2004年第02期

Two criteria for asymptotic behavior of certain second order differential equations are obtained. The results extend and improve Feng's theorem.

Notes on the Scaling Function

作者：WUHua-an; ZHANGGui-zhen 刊期：2004年第02期

Regularity of Solution for a Class Zakharov-Kuznestov Equation

作者：MAYun-xin; GUOTian-fen 刊期：2004年第02期

In this paper, we consider the regularity of solution in S for Zakharov-Kuznestov equation in H^s(s>2). Meanwhile, by method of undetermined coefficient we prove that there don't exist and conservative integral include 2 order of higher order derived functions.

Global Convergence of a New Conjugate Gradient Methods with a Modification of the Curry-Altman Step-size Rule

作者：CAOLi-hua; SUNQing-ying 刊期：2004年第02期

Conjugate gradient optimization algorithms depend on the search directions with different choices for the parameter in the search directions. In this note, conditions are given on the parameter in the conjugate gradient directions to ensure the descent property of the search directions. Global convergence of such a c...

Boundedness of Multiplication Operators on α-Bloch Spaces

作者：GUOJi-dong; LOUZeng-jian 刊期：2004年第02期

In this note we study and give a full characterization of the boundeness of mul-tiplication operators on α-Bloch spaces.