Abstract:This paper described the variations of frequency spectrum when ultrasonic pulse transfered at cement paste in hardening process and analysed the relation among the velocity,frequency,amplitude of ultrasonic and age of cement paste from testing results,the

Abstract:Characteristics of transfer girder are analyzed by using finit element method.The effect of relative stiffness of the transfer girder with the upper wall and below column on the mechanical behaviour of transfer girder is analyzed.

Abstract:This paper presents a hypercube hierarchy model(HHM).The distribution and adjacent relation of each vertex of HHM are discussed in detail.The alogrithm for optimal fault diagnosis in systems represented by HHM and the maximum independent sets are also dis

Abstract:多级分层网络是ＡＴＭ中实现自由交换虚电路的一种实现策略之一。由此提出了一种递归扩展的层次式互联网络结构，分析了号码制度，信令协议等技术问题，并研究了这种对应于分层地址分配的层界面ＡＴＭ交换机的排队模型。

Abstract:This paper shows the optimal marketing strategy for the agricultural products to export is a geometric programming problem.We can use dual theory to change this particular nonlinear optimization problem into the solution of an equivalent system of linear

Abstract:This paper discusses the goal of optimal control of foreign debts' scale and structure,and the determination of the constraints.Then the non linear goal programming model of the optimal control is set up.

Abstract:Based on bayesian principle,inference in structure change of parameters of Gamma distribution with multiple change points is investigated,and a general formula of Bayesian detection is given .By comparison among marginal posterior densities,detection and

Abstract:We introduce and investigate lower homomorphisms and upper homomorphisms of generalized continuous lattices.A necessary and sufficient condition for a mapping between compact elements of generalized algebraic lattices to be extended to a lower homomorph

Abstract:We discuss the boundedness in L p for commutators of general Riesz means.The result obtained here shows that under the assumption that the hypersurface has non vanishing Gaussian curvature,the boundedness is similar to the classical Bochner Riesz m

Abstract:A geometric nonlinear dynamic analysis of beam is presented and the importance of interaction of shearing and axial forces in nonlinear dynamic analysis is investigated.The results obtained show that the interaction of shearing and axial forces is the key

Abstract:This paper introduces the multimedia CAI system on university physics established by the authors which can be applied in classroom teaching and students' selfstudying.

Abstract:合成了海泡石固载金属卟啉，研究了它们对亚碘酰苯在常温常压下选择性氧化环己烷成为环己醇和环己酮反应的催化作用。研究结果表明，对环己烷的温和氧化反应，海泡石固载金属卟啉比未固载金属卟啉具有更好的催化性能和重复使用性能。

Abstract:Cosine gradient loaded column has been designed.The proportion of stationary liquid and support is changed according to cosine gradient in column.The relationship between gradient loaded effect and parameters have been deducted theoretically and verified

Abstract:By using the point charge model in K 3C 60 crystal,we have computed the cohesive energy,crystal lattice constant at equilibrium and bulk modulus.The obtained crystal lattice constant is in good agreement with experimental value.

Abstract:According to the feature of deep micro hole drilling,the importance of studying new micro drill is introduced.The mathematical models for flank and rake of new micro drill point are set up.The solving method for main cutting edge and grinding principle

Abstract:We have studied the experimental apparatus for laser welding diamond saw blades,the process parameters,the metallurgy aspect of the weld and the bonding strength of the diamond saw blades.

Abstract:Characterization of EPS cushion material under vibration is employed.The mathematical model of the cushion material is established using non linear viscoelastic theory.By means of the stress relaxation test,the parameters of the model are determined by u

Abstract:采用化学反应方法使平均粒径２－３μｍ的铬质点在天然鳞片石墨表面原位生成，由粉末冶金制备的含有这种铬质点的石墨／铜基复合材料的电阻率为９．５μΩ．ｃｍ，且磨损率极低。

Abstract:This paper introduces the design thinking,general construction,knowledge expression,inference rules,and implementation functions for remote sensing image with interpretation expert system(RSPES).The RSPES integrates the image processing system,expert syst

Abstract:This paper introduced one kind of storage and transmission technology for NVOD(near video on demand) system,analysed one implementation of STB's(set top box) playing functions,studied the problem of controlling the information in STB's buffer and proposed

Abstract:A design method for ripple free deadbeat control systems using two degree of freedom configuration is proposed.The parameters of the controllers are directly determined by successively solving two Diophantine equations.The resulting ripple free deadb

Abstract:Based on the research into the characteristics of impedance frequency and impedance moisture of cereals,the new instrument for quick measuring moisture content of cereals was made.It has advantages of better stability,high sensitivity,fast response and

Abstract:A new method for describing failure criterias is presented.It is fit for describing failure criterias of concrete.As a reference,it can be used to choose experimental data and to design failure surfaces.