Construction of Inertial Manifolds by the Hadamard Method

ＣｏｎｓｔｒｕｃｔｉｏｎｏｆＩｎｅｒｔｉａｌＭａｎｉｆｏｌｄｓｂｙｔｈｅＨａｄａｍａｒｄＭｅｔｈｏｄＬｉｕＱｉｎｇｍｉｎ（刘青民）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＬａｎｚｈｏｕＵｎｉｖｅｒｓｉｔｙ，Ｌａｎｚｈｏｕ，７３００００）Ａｂ...     

具有线性扰动的线性脉冲微分系统的有界增长

本文介绍了脉冲微分系统的有界增长的概念，并进一步讨论了具有线性扰动的线性脉冲微分系统的有界增长问题，得到了反映无扰和扰动两种情形下脉冲微分系统有界增长关系的定理。     

关于M／M~［r］／1系统的一个注记

徐光辉［１，第六章§１］讨论了成批服务系统Ｍ／Ｍ［ｒ］／１，并在ｌｉｍＰｊ（ｔ）＝Ｐｊ＞０假设下，求出马氏过程Ｎ（ｔ）的平稳分布｛Ｐｉ｝，李文琦等在［２，Ｐ１６８８］指出［１．Ｐ２１８—２１９］给出的关于ｌｉｍＰｊ（ｔ）＝Ｐｊ＞０的证明是不准确的，并利用Ｆｏｓｔｅｒ判别法给出Ｎ（ｔ）的遍历性的严格证明。本文指出Ｎ（ｔ）的遍历性可由Ｐｉｊ（△ｔ）的表达式及Ｔａｋａｃｓ［４，Ｐ９４定理２］推出。     

Fission and Fusion in the New Localized Structures to the Integrable (2 + 1)-Dimensional Higher-Order Broer–Kaup System

By means of the Weiss–Tabor–Carnevale (WTC) truncation method and the general variable separation approach (GVSA), analytical investigation of the integrable (2+1)-dimensional higher-order Broer–Kaup (HBK) system shows, due to the possibility of selecting three arbitrary func.tions, the existence of interacting coherent excitations such as dromions, solitons, periodic solitons, etc. The interaction between some of the localized solutions are elastic because they pass through each other and preserve their shapes and velocities, the only change being the phase shift. However, as for some soliton models, completely non-elastic interactions have been found in this model. These non-elastic interactions are characterized by the fact that, at a specific time, one soliton may fission to two or more solitons; or on the contrary, two or more solitons will fuse to one soliton.     

时分双工方式下的F-PRMA协议及其性能分析

本文提出了一个适合微蜂窝移动通信的时分双工方式下的分组预约多址协议－Ｆ－ＰＲＭＡ（Ｆｒａｍｅ－ｂａｓｅｄＰａｃｋｅｔＲｅｓｅｒｖａｉｔｏｎＭｕｌｔｉｐｌｅＡｃｃｅｓｓ）利用马尔夫过程理论为Ｆ－ＰＲＭＡ协议系统建立了三状态简化模型，应用Ｔａｓａｋａ提出的平衡点分析方法（ＥＰＡ）对该协议进行了性能分析，推导出分组丢弃概率和系统吞吐率等重要性能参数的解析式，通过数值分析和系统仿真全面考察了允许概率Ｐ帧长     

High-temperature liquid chromatography. Part I. Determination of the vapour pressures of binary solvent mixtures—Implications for liquid chromatographic separations

This paper is the first in a series of consecutive publications, explaining the concept of high-temperature liquid chromatography under various important aspects. The first publication deals with the determination of the vapour pressure of binary solvent mixtures used in reversed-phase liquid chromatography. Also, the practical implications regarding the use of elevated temperatures in liquid chromatography and towards commercially available HPLC systems are explained.     

统一策略管理系统及安全产品通用规则设计

论文针对目前安全产品多样化和安全管理员负担过重的现状提出了统一化策略管理的概念,使定制和部署安全策略更加方便快捷,降低了网络安全管理的成本。文章设计了统一策略管理系统的整体架构,给出了规范定义的信息安全产品通用规则所包含的要素,并用XML实现了其语义,图形化界面开发也已经初具原型。最后,提出了统一策略系统的进一步的研究方向。     

解线性方程组的一种预处理方法

用迭代法求解线性代数方程组时,由于收敛条件较严,只能对一些特殊矩阵(如对角占优、对称正定矩阵等)构造迭代公式.针对一般的线性代数方程组,本文采用预处理的手段. Gauss-Seidel迭代法做出了改进,可以将Gauss-Seidel迭代法不收敛的线性方程组,选取适当的预处理因子,使得线性方程组预处理迭代收敛.     

ON THE CONVERGENCE DOMAIN OF THEMATRIX MULTISPLITTING RELAXATION METHODS FOR LINEAR SYSTEMS

The convergence of the parallel matrix multisplitting relaxation methods presented by Wang (Linear Algebra and Its Applications 154/156 (1991) 473-486) is further investigated.The investigations show that these relaxation methods really have considerably larger convergence domains.     

THE CAPACITY CALCULATION FOR CDMA MOBILE SATELLITE COMMUNICATION SYSTEM

On the basis of considering downlink power flux density limit, shadowing effect frequency reuse in different systems and adjoining beams of same system, adopting voice activity and polarization isolation techniques, the capacity of CDMA mobile satellite communication system at different downlink power flux density limit modes, channel spread bandwidth and mobile user's quality factor of receiving system(G/T) are analysed and calculated, and compared with the ones of TDMA and FDMA. The conclusions are given at the end of this paper.