Velocity Profile in Fixed Beds: A Study on the Representativeness of the Experimental Measurement of Downstream Flow Characteristics

Although considerable progress has been made in the development of experimental techniques for investigating velocity distribution inside a fixed bed, these techniques were limited to special cases. Consequently, the velocity distribution is normally measured at downstream of the fixed bed and then this measurement is considered to be representative for the flow inside the bed. To evaluate the representativeness of this technique, this work presents a study of the change in the flow characteristics, starting from the boundary of the fixed bed within the pipe to a downstream position where the experimental measurement is taken, by using simulations based on computational fluid dynamics methods.     

A unified proposal for characteristic testing methods and figure of merit of 8‐kV/3.5‐kVA class light‐triggered thyristors

Power devices with high capability have been developed. 8‐kV/3.5‐kA‐class light‐triggered thyristors have the highest capability among power devices. These devices are used in the Kii Channel HVDC transmission system in Japan. In this paper, we report the extracted problems of conventional testing methods of 8‐kV/3.5‐kA‐class light‐triggered thyristors among manufacturers, and the proposed unified testing methods on the basis of element characteristics and operating conditions in the Kii Channel HVDC system. Furthermore, we propose a figure of merit for power devices for the practical use, and try to extract elements used at the Kii Channel HVDC system with small margins and low withstand capabilities. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 140(3): 61–70, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10024     

离心泵性能参数的自动测定和自动控制

通过将计算机技术应用于离心泵性能参数的研究，实现了离心泵性能参数的自动测定和自动控制。     

胶带机拉紧装置的计算分析

从胶带机三种基本拉紧装置的特点出发，考虑可能出现的工况，编制计算机程序，全面地分析了三种拉紧装置对选用胶带的影响，同时对拉紧行程的范围也加以讨论。     

Computation of concentrations of characteristic atoms of alloys in BCC structure

In this paper,taking Nb-Mo alloy system as an example,the equations of concentration of characteristic atoms of alloys in BCC structure were obtained on the basis of the idea of systematic science of alloys and the number of coordination atoms.The concentrations of characteristic atoms in B2-NbMo type ordered alloys were calculated as functions of ordering degree(s) and composition xMo.When s=smax,the concentrations of characteristic atoms of stoichiometric B2-NbMo intermetallic compound are equal to that o...     

DEPENDENCE OF PREDICTION MODEL OF FORMING LIMIT STRAINS ON FORMING METHOD AND MECHANICAL PROPERTIES OF SHEET METALS

ＤＥＰＥＮＤＥＮＣＥＯＦＰＲＥＤＩＣＴＩＯＮＭＯＤＥＬＯＦＦＯＲＭＩＮＧＬＩＭＩＴＳＴＲＡＩＮＳＯＮＦＯＲＭＩＮＧＭＥＴＨＯＤＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＳＨＥＥＴＭＥＴＡＬＳ①ＺｈｏｕＷｅｉｘｉａｎＤｅｐａｒｔｍｅｎｔｏｆＡｅ...     

探索新体系 形成新特色──编写《电力系统分析》教材的体会和作法

本文介绍了作者在总结教学改革和课程建设成果的基础上编写《电力系统分析》教材的体会和作法。指导思想是‘探索新体系,形成新特色”。针对课程本身的任务和学科的系统性,将全书分为三篇：电力系统的基础知识;电力系统的基本计算和电力系统的运行分析。特色为：注重学生能力的培养;少而精;适时反映学科的发展与进步。配套：思考题、习题及计算机辅助教学软件包（ＣＡＩ）。     

电镀塑料制品对结构设计及成形工艺的要求

为保证电镀塑料制品的质量,提出了符合电镀要求的塑料制品设计原则,并且指出在注塑成形时,对塑料经过充分干燥,采用较高的注塑温度,较低的注射压力和较慢的注射速度,是使镀层获得良好结合强度的先决条件。     

中国传统造物艺术研究——中国古代建筑环境造物艺术的美学特征

美学是研究美、美感以及艺术美的学科,对于中国古代建筑环境造物艺术的美学特征,自古有之,它充分的体现了中国悠久的建筑的历史,同时表达了人们对生活的向往和热爱。本文就以中国古代建筑环境造物艺术的美学特征进行论述,从文中可以领会到中国古代建筑环境造物艺术的博大精深。