Abstract:In this paper some partial derivatives of a matrix funclion with respect to a vector variable are derived first. By using of these derivatives，the representation of the normal approximation for any distribution density function of a random vector is given. Next some moment formulas of normal random vector are developed. An approximation method of state estimation for a nonlinear system is discussed as an application of the above rersults.

Abstract:Taking two typical TV and FM broadcasting transmitting antennas for example，the paper relates to a computational method for electromagnetic pollution of TV and FM broadcasting transmitting stations. In the paper are also compiled different computational formulas in common use and their relative measuring charts and curves for some TV and FM broadcasting antennas field-strength. In addition，the general method of drawing "equivalent field-strength curve" is given to describe electromagnetic pollution range.

Abstract:Here presented is a specific calculation method bassed on the priciples of geometric optics of the advanced Cassegrain Antenna. And another calculation method is given to determine the amplifude and phase of the three-mode Conical Horn of TE₁₁, TM₁₁ and TE₁₁ by applying the aperture，field method，and also the figures of its phase center. Finally，the authors propose some ideas for improving the efficiecy of the antenna.

Abstract:An Automatic Recognition Procedure is provided to recognize military objects on simplified background，such as aeroplanes and tanks，etc. There are several steps in the digital processing procedure，they are noise filtering，object segmentation，feature extraction，classification and displacement measuring. Simple and effective algorithms are used in each step. They are median filtering for noise cleaning，histogram fitting algorithm for object segmentation，advanced moment invariant for feature extraction，nearest neighbor rule for object recognition and projection center measuring for displacement measurement of the object center. Simulation is applied to each procedure through an experimental image processing system and this method is proved to work effectively On simplified background，ie. low noise condition. Since all the algorithms are simple，the system may be accomplished with multi microprocessor cascade.

Abstract:Colour Display Systems play an ever-increasing important role in the development of C³ (command，control and communications) systems. In the paper we discusse a practical colour display system with Intel 86/330A system as the host microcomputer and the VDU-140s terminals. The discussion centres on the work in the development and the configuration of iRMX86 operating system.

Abstract:The stress corrosion cracking threshould stress intensity Kiscc and the rate of crack propagation da/dt of aluminum alloys LY12cz in the 3.5% NaCl aqueous solution，in saturated NaCl aqueous solution and in 3.5% NaCl aqueous solution of the containing combinated inhibitor are measured and studied by DCB specimen in this paper，the effect of Cl^- concentration and the combinated inhibitor have been analyzed in details. Through scanning electron microscopic fractography，it is shown that the fracture aspects of stress corrosion crack of aluminum a11oys LY12cz in contained Cl^- aqueous solution is a intergranular crack and the fracture feature is that of stone. Although the properties of stress corrosion cracking can be improved so as to decrease the rate of crack propagation abviously by the above mentioned combinated inhibitor，it can not be changed for the fracture feature.

Abstract:This paper theoretical1y solves the problem of decomposition of the general quadratic programming and proves that the programming after decomposition is also locally quadratic. Section 1 consists of the general problem of decomposition and the main result. Section 2 is a preliminary and section 3 presents a prove for the main result.

Abstract:This article presents a systematic and rigorous proof of several lemmas，theorems and corollaries of reachability and controllability for discrete-time，time-invariant systems，

Abstract:In this paper，the Galerkin method for solving a class of homogeneous Dirichlet problems of the second-order elliptic equation is put into the operator scheme by verture of (-⊿)^-1. I study the convergence of the method. The error estimates of the finite element and a form wich is applied more conveniently in some cases than the Aubin-Nitche technique are obtained.

Abstract:The paper briefly shows the significance in studying the history of mechanics of materials. By examples，the author points out several problems worthy of note in studying and introducing its history. In addition，some historical materials，both in China and abroad，are briefly introduced or studied.

Abstract:本文介绍一台200KeV中子发生器的调试结果：用200KeV，1.5mA 氚束轰击氚钛靶，由(d，T)反应产生中子产额可达2x10¹¹n/s；有效直径为20mm质量好的新靶，在160KeV，0.8mA下，中子产额5X10¹⁰n/s维持4小时。该发生器采用高频离子源，用普通高压电瓷绝缘环装配加连管，高压电源采用四级倍压回路、离子源和高压电源的供电频率50Hz，靶室用水冷却。

Abstract:本文补充了文献[1]中遗漏的二体算符矩阵元，包括玻色子（β，γ)→(α，α)→(α，α)→（β，γ)，(α，α)→(α，β)，(α，β)→(β，β)，(α，γ)→(γ，β)跃迁矩阵元和费米子(α，γ)→(γ，β)跃迁矩阵元，并给出了无遗漏地计算二体算符全部非零矩阵元的简便方法。本文结果与 Stater-Condon 规则一致^[2-4]，并已用于研究生《高等量子力学》教学。

Abstract:本文系统地探讨了对信号进行线性的变量代换的一般规律，分析了通常容易出错的原因，给出了实现这种代换的解析的及作图的系统性方法。

Abstract:Many papers about Fuzzy algebra have been published since A. Rosenfeld presented the concept of Fuzzy subgroups in 1971. As further work in this respect，we study the direct sum of Fuzzy subrings in this paper，introduce the concepts of projective Fuzzy sets and marginal Fuzzy sets of direct sum rings，and abtain a necessary and sufficient condition that a Fuzzy subring on the direct sum of rings may be represented by the direct sum of Fuzzy subrings on each ring. Finally，a similar discussion of t-Fuzzy subrings is suggested.