Ultrasonic spectrum characterization of pig''''s pathological liver tissues

I.IntroductionCurrent1ythemajorityofcommcrcialultrasonicscannersutilizeon1ytheamplitudcinformationcarriedbytheechoesbackscatteredfrombiologicaltissuestoproduccandriageintimedomain.Potentia1lyusefulinformationinfrequencyd0maincontainedbytheechoesiscomp1ete1ydiscarded.Theu1trasonicspectrumanalysistechnique,whichcancompensatethislack,canpresentsomeusefulparametcrsinfrcqucncydomainusedinultrasonictissuecharacterization.Onthisbackgroud,asericsofworksonthisficldhavcbeendoneduringthepastdecadell-5l.…     

纳米结构氧化薄膜的固态多核核磁共振研究(英文)

Knowledge of the structure of thin oxide films is very important for electrochemistry, microelectronics and catalyses. Supported oxide catalysts （supported thin oxide films） are used extensively in the petroleum, chemical and pollution control industries as catalysts for a wide range of chemically important transformations.     

达兰贝尔函数方程

Ⅰ 引言 达兰贝尔函数方程(1) 2f(x)f(y)=f(x y) f(x-y)有悠久历史,可回溯到达兰贝尔(d'Alembert),泊松(Poisson)和皮卡(Picard)。这个方程在各种欧氏几何和非欧几何的两个矢量的求和中起着重要作用。 在方程(1)中,被预定为定义在全体实数上的连续实值函数。在这个假定下,(1)的解只     

拉曼散射研究微尺寸圆锥形状的GeSi合金薄膜的应力(英文)

pacc:7830,7850C Wepresentthemicro-Ramanstudyof curvedGexSi1-x/GeySi1-yheterostructure,and foundthestrainofthecurvedthinlayerispropor tionaltothecurvature,i.e.inverselyproportional tothediameter.TheopticalandelectricpropertiesofSi1-x GexalloygrownonSisubst…     

ANALYTIC SOLUTIONS OF AN ITERATIVE EQUATION WITH FIRST ORDER DERIVATIVE

This paper is concerned with a nonlinear iterative equation with first order derivative. By construction a convergent power series solution, analytic solutions for the original equation are obtained.     

THE POINCAR BIFURCATION OF QUADRATIC SYSTEMS HAVING A REGION CONSISTING OF PERIODIC CYCLES BOUNDED BY A HYPERBOLA AND AN ARC OF EQUATOR

The usual bifureation problems oeeurred in the study of the Planar differential systems having a region eonsisting of Periodie eycles are as follows:15 there any closed orbit whieh generates limit eyeles after a small perturbation?How many limit eyel     

光纤设备在安全领域中的应用

光纤设备在安全领域中正在获得日益广泛的应用。分离器、耦合器、多路调制器、开关以及为扩充光缆能力而开发的传感器等方面近年来都获得了迅速的进展。由于技术上的改进,目前已能提供黑白与彩色两种无噪音视频传输系统。采用光纤进行视频传输的系统,还可同时在监控区域内传送声音。在安全领域中对光纤设备进行配套组合应用,能确保设备运行更为安全、有效。本文所提出的光学设备,对室内应用和室外应用都是适合的。光纤设备在数据通信领域中无论用作短距离还是长距离的通信都是适宜的。     

方位角关联函数与核媒质态方程

本文采用方位角关联函数二种方法对Bevalac流光室1.2A GeV Ar+KC1碰撞实验进行了研究,并和相对论Vlasov-Uehling-Uhlenbeck理论的结果进行比较,检测了核媒质态方程的软硬程度.对于方位角方法,反应平面方位角的离散使方位角分布最大非对称性的计算值比真值下降了约30%.采用本文提出的方位角关联函数的方法能够消除这一影响.     

Interval Valued Intuitionistic （S, T）-fuzzy Hv-submodules

On the basis of the concept of the interval valued intuitionistic fuzzy sets introduced by K. Atanassov, the notion of interval valued intuitionistic fuzzy Hv-submodules of an Hv-module with respect to a t-norm T and an s-norm S is given and the characteristic properties are described. The homomorphic image and the inverse image are investigated. In particular, the connections between interval valued intuitionistic （S, T）-fuzzy Hv-submodules and interval valued intuitionistic （S, T）-fuzzy submodules are discussed.