电致伸缩陶瓷微位移器非线性的数值方法补偿

本文通过对电致伸缩陶瓷材料的非线性进行分析。找到了补偿电致伸缩陶瓷非线性的数值方法，并对不同回程大小的电滞回线进行了分段处理，使补偿结果更为精确。     

石家庄市CATV系统网络技术指标分配初探

在ＣＡＴＶ系统网络工程设计中，技术指标的分配产关键问题。本文介绍了石家庄市在系统设计时采用的符合实际的设计程序，并对系统前端，传输及用户网各部分技术指标的确定，计算与分配方法，指标的核算等作了较详细地阐述，以供同行参考。     

The inverse mapping and distortion measures for 8-node hexahedral isoparametric elements

The inverse relations of the isoparametric mapping for the 8-node hexahedra are derived by using the theory of geodesics in differential geometry. Such inverse relations assume the form of infinite power series in the element geodesic coordinates, which are shown to be the skew Cartesian coordinates determined by the Jacobian of the mapping evaluated at the origin. By expressing the geodesic coordinates in turn in terms of the isoparametric coordinates, the coefficients in the resulted polynomials are suggested to be the distortion parameters of the element. These distortion parameters can be used to sompletely describe the inverse relations and the determinant of the Jacobian of the mapping. The meanings of them can also be explained geometrically and mathematically. These methods of defining the distortion measures and deriving the inverse relations of the mapping are completely general, and can be applied to any other two-or three-dimensional isoparametric elements.     

多级泵站老化的模糊评价模式

多级泵站是一个包括各级泵站及泵站内各种设施的复杂系统，系统内各个泵站的老化直接影响整个泵站系统的正常运行，采用单元化方法将多级泵站系统单元伦，引和泵站老化评价指标，建立了多级泵站老化的模糊评价模式，并对甘肃省景泰高扬程提水灌区多级泵站系统进行分析，提出了评价多级泵站老化程度的排序方法。     

并购是手段,效益是目的,整合是保障--对中国啤酒工业规模扩张潮的思考

近年来啤酒工业掀起并购扩张高潮，虽然规模扩张，但是却没有带来经济效益的同步增长。其主要原因是：扩张后生产能力未能充分发挥；价格战的扼制；没有充分的资金、人力对并购企业进行内部整合。而内部整合重于规模扩张建设，扩张的目的不是简单做大，而是要做强。有效的整合应做到：（1）具备充足的整合能力。（2）被并购企业积极支持内部整合。（3）加强企业文化整合，使两种企业文化完美融合，并形成一种新的文化。（君健）     

“仪表系统接地设计规定”介绍

概述“仪表系统接地设计规定”（2000版）的内容，重点介绍等电位联结的接地方式及其特点。     

AN EXTENDED MODELING OF TIDE-WAVE MOTION

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｏｓｔｕｄｙｔｈｅｍｏｔｉｏｎｏｆｔｈｅｔｉｄｅ ｗａｖｅｓ,ｔｈｅｓｈａｌｌｏｗｗａｔｅｒｅｑｕａｔｉｏｎｓ ,ｉ.ｅ .ｔｈｅｖｅｒｔｉｃａｌｉｎｔｅｒｇｒａ ｔｉｏｎｏｆｔｈｅｃｏｎｔｉｎｕｉｔｙｅｑｕａｔｉｏｎａｎｄｍｏｍｅｎｔｕｍｅｑｕａ ｔｉｏｎ ,ｉｓｃｏｎｓｉｄｅｒｅｄａｓｔｈｅｇｏｖｅｒｎｉｎｇｅｑｕａｔｉｏｎｓ.Ｂｙａｂｏｖｅｅｑｕａｔｉｏｎｓｔｗｏｅｑｕａｔｉｏｎｓｒｅｌａｔｅｄｔｏｔｈｅｈｏｒｉｚｏｎ ｔａｌｆｌｕｘｏｆｔｈｅｔｉｄｅ ｃｕｒｒｅｎｔｓａ…     

Flammability and thermal stability studies of ABS/Montmorillonite nanocomposite

Acrylonitrile–butadiene–styrene (ABS)/montmorillonite nanocomposites have been prepared using a direct melt intercalation technique by blending ABS and organophilic clay of two different particle sizes: OMTa (5 µm) and OMTb (38 µm). Their structure and flammability properties were characterized by X‐ray diffraction, high resolution electronic microscopy (HREM), thermogravimetric analysis (TGA) and cone calorimeter experiments. The results of HREM showed that ABS/5 wt% OMTa nanocomposite was a kind of intercalated–delaminated structure, while ABS/5 wt% OMTb nanocomposite was mainly an intercalated structure. The nanocomposites showed a lower heat release rate peak and higher thermal stability than the original ABS by TGA and cone calorimeter experiments. Also, the intercalated nanocomposite was more effective than an exfoliated–intercalated nanocomposite in fire retardancy. Copyright © 2003 Society of Chemical Industry     

原油沥青质沉积引起储集层损害的室内评价

防止沥青质沉积造成的储集层损害是渤海稠油油藏开发生产中遇到的技术难题之一。结合渤海SZ36-1油田实际情况，使用岩心流动实验装置，建立沥青质沉积导致储集层岩心渗透率下降的室内评价方法，并应用SARA法对稠油发生沥青质沉积的可能性进行预测。评价实验结果表明，损害程度与沥青质沉积量和储集层岩心的原始渗透率有关。沉积量越大，原始渗透率越低，则损害越严重。表5参12     

基于B点磁探针膛内电枢电弧长度与速度分布测量的计算机控制系统的研究

基于B点磁探针的测量原理，建立了电磁轨道炮膛内三维等离子体电枢电弧长度和电弧运动速度测量的数学模型，通过对该模型的分析给出了用于测量膛内电枢电弧长度和运动速度分布的相应推论。开发了用于测量膛内等离子体电枢电弧长度和速度的多通道计算机控制诊断系统，并进行了相应的试验研究。