Abstract:In order to search for new antihypertensive agent,1,4-benzodioxane type neolignan Eusiderin G analog was synthesized,and we think that the cyclization of a dihydroxy intermediate under catalysis of strong acid ion exchange resin to give 1,4-benzodioxane s

Abstract:Aiming at the YZ_ 22 vehicle and the 16 m simply supported beam-bridge in crosswind,based on the numerical simulation,the conclusion that both the drag coefficients of the vehicle and the 16 m freebeam bridge with different angle of attack become obvious

Abstract:Based on upper(lower) homomorphisms,we introduce and investigate upper(lower)sublattices as well as direct sums of generalized continuous lattices.The motive is to use them instead of traditional congruence lattices as a new tool of structure problems.

Abstract:Some algebraic criteria for unifromly asymptotic stability and instability of grey systems of time lag are obtained,by using Liapunov Razumikhin theorems of functional differential equations and properties of non negative irreducible matrices.

Abstract:The oscillation of neutral difference equation with continuous arguments is discussed.Some sufficient conditions for the oscillation of solutions of the eqution are established.

Abstract:The transportation of carriers in electroluminescent organic thin films is studied.As known,the mobility is a key physics quantity for describing transportation procession.A theoretical model for describing transportation procession in organic thin films

Abstract:Non-linear vibration of generally laminated non-circular cylindrical shells is examined using the Timoshenko-Mindlin-Kinamatic hypothesis and an extension of Donnell-type shell theory.Equations ofmotion,in which the effects of transverse shear deformation

Abstract:The dynamical equations of the Timoshenko-Mindlin moderate-thickness plate in a non-inertial reference system are derived by Hamiton's principle.The free vibrations of plate in different elastic boundary conditions are analysised.And the system vibration

Abstract:通过对材料组成和结构的设计，获得了高炉渣和钢渣用量为55％－60％，抗弯强度大于300MPa，显微硬度达12GPa，耐磨性比GCr15钢高26倍的玻璃陶瓷。探讨了微晶化工艺条件对钢铁废渣玻璃陶瓷的显微结构和性能的影响，在一定工艺条件下所制备的玻璃陶瓷的晶相含量可达90％以上，晶粒大小仅0．1－0．3μm，多为等轴柱状晶，以辉石类为主晶相。

Abstract:The artificial intelligence and the resolution process of mass spectrum are organically integrated in this system,as a result,the complexity of the resolution process is greatly decreased.At the same time,the ability of resolving practical problem is incr

Abstract:The new way of measuring the outer circle of the piston ring on-position measure is presented.Also the hardware and software of the system is designed.In order to integrate the function of building the free curve of the piston ring,the system includes the

Abstract:The relationship of efficiency,flow direction of meshing power and motion parameter of non-H closed epicyclic gear train are researched.A simple method is developed for judging flow direction of meshing power according to transmitting ratios of epicyclic

Abstract:提出了一种非递推全周波富氏算法中滤除衰减直流分量Ae^t/r的新方法，并在单一数据窗口中推导了与τ无关的精确校正算法，该算法简单，适用于微机继电保护中提取各次谐波分量。

Abstract:Load forecast is the basis of electric power system design,there have been many ways and mathematical models,and the model of grey forecast has been used successfully in load forecast.In this paper,the theory of the limited automator to study the realizin

Abstract:The design principle and constitution of remote concentrated ammeter reading system is presented,the design of its communication software is described.The system can realize not only reading and setting digital ammeter,but also centralizing management of

Abstract:A rule adaptive fuzzy controller is presented to control AC servo system,and a new fuzzy inference algorithm is designed to adjust the rules of fuzzy controller on line.The results of simulation show that the performance of the AC servo system based on ru

Abstract:On the basis of analyzing the filtration mechanisms of membrane filter,the filtering features of each capillary in membrane are changeable with the time and spatial positions during operation.And filtering features of filter should be estimated comprehens

Abstract:The cost functions,which is used as the objectives in water quality programs is always non-linear,the common way to solve this question is to linearize the objective function and use the LP method.The paper concluded through examples that the result of pr

Abstract:Accroding to the concept of reliability on construction,the method of corroborating reliability and the scale of reliability is discussed.The program of reliability of constructing project is analyzed and the accounting method is discussed.It gives a demo

Abstract:采用数值模拟技术，分别计算了横风中不同来流攻角下YZ22型车辆单体、铁路16m预应力T形简支梁桥单体、YZ22型车辆和铁路16m预应力T型简支梁桥组合体的阻力系数和升力系数。研究表明，当YZ22型车辆通过铁路16mT形简支梁桥时，YZ22型车辆和T形简支梁桥所受风荷载均比各自单独存在时明显增大，认为在桥梁设计时，应考虑车辆过桥对桥梁风荷载的影响。

Abstract:A new algorithm of image retrieval based on dominant color set is presented.Each image only has several dominant colors.First,the quantification,color cluster and color composition are taken to reduce the dimensionality of the HSV color space,and then a d

Abstract:An image equalization method modified with bit-right is discussed.The result shows:compared with ordinary process method,this improved method is more adaptable and has better effect,and will have wide application to X-ray picture processing.

Abstract:Two of the main modern portfolio selection theoriesCapital Assets Pricing Model and Arbitrage Pricing Theory are introduced.The construction of the two models and their description about forming equlibrium are analysed and compared.A conclusion is drawed.