Abstract:The relation of four definitions of elementary Mbius groups of N dimensions is studied.A necessary and sufficient condition for that a Mbius group being a elementary group is obtained.When elementary groups are discrete,a structure theorem is given.

Abstract:By using Mawhin's coindence degree theory,the existence of periodic solutions for the second order functional differential equations is discussed.Some examples are given to illustrate its applications.

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Abstract:The controllability of singular control systems with delay is studied,then some necessary and sufficient conditions are given.

Abstract:Two classes of distance boundary condition domains K BC and j BC are studied,and several properties of them and some relations between them are obtained.

Abstract:The stroboscopic method presented by Li Li for the study of strongly nonlinear systems with single degree of freedom is extended to systems with many degrees of freedom.By using the method,the stroboscopic equations are set up and the approximate expressi

Abstract:研究了广义Ｈａｒｐｅｒ模型的量子扩散，分析了自关联函数Ｃ（ｔ）在不同哈密顿量参数区域的长时特征。结果表明，在金属区Ｃ（ｔ）－Ｔ＾－１，而在绝缘体区Ｃ（ｔ）－ｔ＾０。

Abstract:A new telephone with kinds of functions is devised,stringing together to call and wiretap illegally is resisted.The date and time used during conversing is displayed and stored by single slice computer,and can be printed.

Abstract:The synthetic method of unsaturated carboxylic acid copolymer is studied and that copolymer presented high performance for air entraining and water reducing function.The synthetic route is designed.In this route polyethylenediol derivative maleic anhydr

Abstract:对化学共沉淀法制备了ＴＺＰ纳米粉末进行了系统的研究，探讨了盐溶液浓度，ｐＨ值，煅烧温度对粉末性能的影响，提出了制备ＴＺＰ纳米粉末的适宜工艺参数Ｃ＝１．０ｍｏｌ／Ｌ，ｐＨ＝９．５，Ｔｃ＝７００℃。

Abstract:A new method for structural parameters identification using BP neural networks is presented,which takes the dynamic residual vector of a structure as inputs of the neural network for parameters identification.The method named the Generalized Spaced Latt

Abstract:A new distribution function on edge point is presented according to the requirement of grid quality during the aerodynamic simulation.Two dimension grid generation system,which is suitable to control the density of grid on any edge condition,is establishe

Abstract:A multi channel engine analyzer,used for the measurement of transient combustion characteristics of an engine,is introduced.The consecutive cycle number that the system can measure is over 100 when four input channels work at the same time.The practice s

Abstract:Nanometer SnO 2 powder was prepared by the hydroxylation method of metal alcoxides.The structural characterizations of the powder were studied.The technique has many advantages:simple flow sheet and equipment,low cost,little pollution,high purity(99.9 %)

Abstract:The object of this paper is to demonstrate the influence of synthetic conditions such as synthetic temperature,time of keeping constant temperature and Mn/Li molar ratio in raw materials on the microstructure and charging discharging capacity of LiMn 2O

Abstract:A new method based on sampling data is presented to measure frequency of power systems.By this method,not only the speed of calculation is accelerated,but also the accuracy of measurement is improved.The method is especially suitable for real time me

Abstract:This paper generalizes the developing trend of doubly fed machine in domestic or international,deals with its advantages on technology.And it points out that the doubly fed machine is a kind of Hi tech product closly related to the technology of power

Abstract:The sufficient and necessary conditions of stability and controllable outputs and control laws for systems with unmeasurable and measurable constant disturbances are derived.Based upon above a design method of practical industrial regulators for linear ti

Abstract:对有理双子的“和”运算与“积”运算的“湮没”问题作了一般性的研究，其结果在简化双子运算，揭示其有理双子的稳态部分的性质有十分广泛的应用。

Abstract:In the sub structure technique of dynamic soil structure interaction analysis,the frequency dependence of the impedance of soil results in a fact that the stiffness matrices and the damping matrices of the motion equations of soil structure systems ar

Abstract:The design principle of Discharge Meter by selecing the measurment point using precision analysis is expounded.The conversion formulas are developed between the average velocity of cross section and the maximun velocity by carrying out regression analysis

Abstract:The concept of dynamic thermal performance identification for building envelopes is presented.It's approaches and positions are described.The construction and characteristics of a system for the dynamic thermal performance identification is introduced in

Abstract:A design of the experimenttal system,in which the temperature and humidity can be controled by using saturated salt solution,has been introduced.The moisture equilibrium contents under different temperature and humidity conditions of three kinds of the co

Abstract:The mechanism of dynamic data exchange is analysed.Using the advantage of the source of Windows and the object oriented programming method the software is developed.Furthermore,the several data exchange's standards of HVAC CAD software are also explored

Abstract:A microcomputer system which is made of single chip microcomputer and PC is presented.The system is used to real time monitor,record and analyse the frequency for the power network.This method can overcome the difficulties in manually operation,improve t

Abstract:以资本资产定价资产定价模型的均衡性为基础，分析市场证券组合的代理证券中Ｒ－β的普通最小二乘回归截面关系与代理证券边界。