地电位升高对通信设备的影响及其防护

针对电力通信系统运行特点,着重对电力系统接地故障引起的地电位升高及其对通信设备的影响进行了分析,提出了相应的保护措施,并介绍了两种保护装置。     

无功、负序及谐波电流检测中的数字滤波器研究

数字滤波器是基于瞬时无功理论的无功、负序及谐波电流检测中一个重要部分,其精度和速度直接影响检测的结果。文中在各种电压和电流情况下对电流检测中所需要的数字滤波器进行分析,得出数字滤波器分类设计的想法,并优化设计出三种适用于不同电压和电流情况的数字滤波器。仿真和实验结果证明所设计的数字滤波器与目前电流检测中使用的数字滤波器相比,在保证精度的同时能有效提高速度,且本身算法的复杂性并未显著增加。     

MODELING METHOD OF 4D INFORMATION MODEL FOR COOPERATIVE DESIGN OF MECHANICAL PRODUCTS

The continuous developing features in the design of mechanical product and based on 3D entity model is aimed at, and the extension of the 4-dimensional model with the process of designing, the knowledge described model on the level of semantic understanding and summarizing the designing process and the way of discovering knowledge from multi-information model are studied. On the basis of designing the broad sensed collaborative system, through discussion of the relationship between the implicit knowledge of the users and the designing knowledge as well as commanding all the designing links, taking advantage of the way of concluding and deducting in the concept of the designers, the synthetic knowledge unit formed in the dynamic process from the conception design to the last design is schemed out, and the knowledge discovered principle in the dynamic designing process of the mechanical products and the key technology in its implementation under the milieu of network is brought forward.     

五阶非线性作用下光纤中类明孤子的演化特性

根据含五阶非线性微扰修正项的非线性薛定谔方程,采用变分法,导出了光纤中类明孤子各参数随传输距离演化的方程组,研究了脉宽与距离、啁啾与脉宽之间的关系,并对描述相位和频率的方程组用龙格-库塔算法进行了数值求解.结果表明:五阶非线性使类明孤子的脉宽压缩,可在一定程度上抵消初始啁啾和三阶色散对脉宽的展宽作用;五阶非线性对类明孤子的相位和频率演化特性的影响不明显,因而适度的五阶非线性(γ在0.0001到0.1之间)有利于类明孤子的稳定传输.     

生物芯片扫描仪研究进展

简要介绍生物芯片的基本概念以及生物芯片检测装置的国内外发展动态;分别介绍了本文设计的CCD系统生物芯片检测仪和激光共聚焦生物芯片扫描仪的原理、结构、工作状况以及设备的技术参数。最后指出更高分辨率(小于1μm)的生物芯片扫描仪是该设备今后的发展趋势。     

化工原理及其实验教学改革

为了适应化学工业新技术日新月异的发展,根据化工原理及化工原理实验课程的特点以及化工学科今后的发展趋势对化工原理及其实验课程教学进行教学改革,以提高学生对该课程的理解、独立实验操作能力和实验创新能力,促进课程教学质量的提高。     

STUDIES ON RETRIEVAL OF THE TURBULIVITY OF ATMOSPHERIC BOUNDARY LAYER

1. INTRODUCTION Human activities mainly occur in the atmospheric boundary layer and turbulent transfer is a key factor for the exchange of substance and energy of the earth-atmosphere system, so atmospheric turbulence must be described accurately for all …     

AN ALTERNATIVE PERSPECTIVE ON FUZZY SET-BASED APPROXIMATE REASONING

Abstract

On the subject of fuzzy set-based approximate reasoning, this paper attempts to present a perspective that is both rigorously stated and different from the standard approach as stated by Mamdani and many others. Functionally speaking, this alternative perspective produces results essentially the same as the standard one, and in fact we intend to prove that subject to certain assumptions the results will be exactly die same. We feel however that the alternative perspective offers advantages in that it makes a more appropriate and more understandable use of such concepts as fuzzy relations, the extension principle, and fuzzy composition. If indeed it can lead to a clearer and more widespread understanding of the approximate reasoning formalism then this could conceivably spark broader interest in fuzzy control and other applications.     

按阻抗原理特殊配置的220kV变压器保护应用

在详细分析220 kV和110 kV变压器的容量不相匹配,以及采用常规保护配置与整定方法可能引发220 kV主变压器110 kV侧后备保护越级跳闸,造成大面积停电事故的基础上,研究并提出220 kV主变保护中的相应后备保护改用距离原理保护而其他保护保留的特殊配置的解决方案。对该解决方案进行了分析和计算,提出在不同情况下对距离保护的整定策略。研制了按阻抗原理配置的220 kV变压器保护装置,进行了静态模拟和动态模拟试验,结果表明,该保护装置是有效和可行的,取得了上下级保护相互配合的预期效果。     

路易斯·康的话语方式和修辞策略

以路易斯·康的论文《Order Is》为例,对法则问题及其研究方法的未来走向进行了思考。