冶金行业照明系统构成及系统设计

随着各个冶金行业的快速发展，我们国家的冶金行业也有了很大的变化，对于冶金行业技术有了很高的要求。想要保证冶金的整体质量，必须要重视冶金的照明系统的建设，对于这些照明系统严格的进行把关和管理，从而能够做好这些部位的质量管理的工作，防止事故的发生，也就提升行业的服务质量。     

浅谈嵌入式系统原理在计算器设计中的应用

作为一种基于LED显示器与键盘的计算器，本文中探讨的计算器运用了嵌入式系统原理，只需要通过键盘输入数字和运算符号，LED就能显示出运算的结果。这种计算机的研究，极大的方便了我们的生活和学习，本文就以计算器实现功能、设计的思路等方面，谈谈嵌入式系统原理在计算器设计中的应用。     

WindowsNT环境下实现SCADA与MIS互联的技术

详细介绍了要ＷｉｎｄｏｗｓＮＴ环境下实现电力企业调度自动化系统与管理信息系统互联通信的软件技术，特别阐述了命名管道，邮件槽，ＤＤＥ等编程方法和多线程技术的使用，并实现了转发服务器，接收工作站的软件设计。     

变电站自动化系统技术方案探讨

论述了变电站监控系统的现状和技术组合实施方案，总结并提出了变电站自动化系统的结构，监控与保护，网络通信，布置方式及采用的经济技术原则，以及无人值守变电站自动化系统实施过程中的一些具体问题和意见。     

全分布开放式计算机监控系统及其应用

系统地介绍了新一代全分布开放式计算机监控系统，说明了该系统的结构，功能，特点，并着重介绍了系统人葛洲坝二江电厂的运行状况及使用效果。     

基于Web的电力企业培训考试系统的设计与应用

介绍了基于Web的网络型电力企业培训考试系统的设计与实现过程，阐述了网络考试系统从系统需求分析与功能设计到系统设计与系统实现的全过程，为电力系统的运行检修管理和其它标准化考试科目开发网络环境下的考试系统提供了借鉴。     

变电站异常处理指导系统的开发与实现

如何快速判断变电站设备的异常并采取正确的措施是变电站运行人员的难点，根据这一需要介绍了在变电站自动化系统下一个异常处理指导系统的实现。该系统对后台监控系统采集到的数据进行了信息集成、信息提炼，实现了一定程度的智能化，在线运行及离线查询的结合，为运行人员提供了全面的异常处理指导功能，有助于提高变电站的自动化水平，加快运行征处理异常的效率。     

输电系统发电机励磁自适应控制的研究

本文在对被控对象的结构特征分析后指出，当串并联自适应状态调节器的基本原理应用于发电机励磁控制时，不能保证自适应律是渐近超稳定的。为此，本文导出了改进的自适应律，并设计了自适应发发电机励磁调节器，利用最优控制来设计参考模型，计算机仿真给出了计算结果和响应曲线，并与常规控制以及最优控制进行了比较。     

复杂系统的脆性与系统演化分析

针对复杂系统的脆性的定义，初步分析了脆性这一复杂系统本身固有的特性对系统演化的影响．通过给出的脆性熵定义，建立复杂系统演化方向判别模型来判断系统的演化方向，并且对复杂系统的约束条件的关系进行了定性的研究，建立了初步的数学模型。     

一类切换系统的连续分段Lyapunov函数

切换系统是一类重要的混合动态系统，其稳定性不但与子系统是否稳定有关，还与切换控制函数有关。本文分析了在特定切换控制函数作用下，切换系统的稳定性，用连续分段Lyapunov函数讨论了切换系统稳定的充分条件。它不但适用于线性切换系统，对非线性系统也适用。连续分段Lyapunov函数的条件比公共Lyapunov函数和多Lyapunov函数的条件容易满足，能够分析含有不稳定子系统的切换系统的稳定性。最后给出两个例子说明了连续分段Lyapunov函数方法的有效性。     

Ultrasonic motors: Their models, drives, controls and applications

In the last decades piezoelectrically driven ultrasonic motors have become alternative actuators to the conventional electromagnetic motors especially for precise and accurate servo positioning applications. Different types of ultrasonic motors have been constructed and manufactured. Several drive systems have been designed, implemented and proposed for these motors. A variety of control techniques have been applied to them. The research given in this study covers bases of the ultrasonic motors. Theoretical background, modeling, drive systems, control techniques and applications of the ultrasonic motors have been introduced. Firstly, the general overview has been given. Then, modeling studies focused on performance estimation and analysis of ultrasonic motors have been examined. Afterwards, drive systems and control techniques of ultrasonic motors have been investigated. Furthermore, an example drive and control system has been presented. This drive system has been designed as to be controlled digitally. In addition, the important industrial and research applications of these motors have been included. The presented study has been arranged as a review of ultrasonic motors. The important points of specifications, models, drive systems and control methods of the ultrasonic motors have been emphasized.     

并网运行的异步发电机设计中几个问题的探讨

本文讨论了并网运行异步发电机设计时,技术指标的选择原则。并从理论上分析了突然三相机端短路和并网时引起的冲击电流,提出了短路及并网冲击电流的计算公式。某些理论分析的结果得到了实验的证明。     

Optimal placement of piezoelectric patches over a smart structure

Control of structural vibrations has significant applications in manufacturing, infrastructure engineering, aerospace engineering and various consumer products. In last two decades, considerable attention has been focused to suppress structural vibrations using active vibration control technique. Various researchers have proposed various optimization criteria for optimal placement of piezoelectric patches over a smart structure to suppress vibrations using various optimization techniques. This paper presents a review of various optimization criteria and techniques that have been used by various researchers in the field of smart structures. Mathematical expressions of objective functions of twelve optimization criteria have been presented and their justifications have been reasoned. Step by step procedures of commonly used optimization techniques have also been presented.     

Modeling stimulus‐driven attentional selection in dynamic natural scenes

In this paper we have developed a neuromorphic model of bottom‐up (BU) visual attentional selection. The output of a recently developed neuromorphic multi‐channel retina model has represented the input of our model. As a first step, a saliency map has been calculated for each retinal channel which, next, has been integrated into a master saliency map. Model parameters have been optimized based on human eye movement data measured during viewing dynamic natural scenes. We have tested two different strategies for weighting the channel‐specific saliency maps during integration into a master map. In the first case, channel weights have been kept constant throughout the verification measurements, whereas, in the other case, they have been updated on each frame, according to the specific properties of the visual input. Surprisingly, the constant channel weighting strategies have performed better than the continually updated ones. We have measured the model's accuracy by defining the hit ratio (concurrence) between the first few predicted locations (the most salient locations) and the measured fixation locations. Constant weighting methods have achieved ～74% hit ratio on four predictions. For a comparison, the accidental chance for this case has been less than 20%. This pure BU approach has performed surprisingly well on dynamic natural input. Some practical applications have already been made with task‐dependent simplifications. Copyright © 2008 John Wiley & Sons, Ltd.     

Novel modeling for the prediction of aged transformer oil characteristics

The effect of aging on transformer oil physical, chemical and electrical properties has been studied using the international testing methods for the evaluation of transformer oil quality. The study has been carried out on twelve transformers in the field and for monitoring periods up to 8 years. The properties which are strongly time dependent have been specified and those which have a great impact on the transformer oil breakdown voltage have been defined. Mathematical models for the breakdown voltage, total acidity and water content as a function of service periods have been given. The validity and applicability of these models for future prediction of these properties have been verified by the good agreement between the measured end predicted values. A multiple linear regression model for each transformer oil breakdown voltage as a function of its water content, total acidity and service period has been introduced and its adequacy has been illustrated by statistical analysis. Another multiple linear regression model has been developed by combining the results of a group of transformers into that of a single equivalent transformer. This model has been validated by predicting the properties of some other transformers and comparing them with the measured values. The comparison showed a good agreement for the results of transformers which have either been used or not in the derivation of the model.     

多总线式光电编码器的设计与应用

介绍一种新型多圈绝对值光电编码器的结构及原理,设计了基于DSP芯片的数据接口与多总线式协议转换装置,给出了软硬件设计方法,使其适应不同现场总线的工业应用领域。实现了对风电控制系统变桨电机转子旋转速度和位置的精确测控。     

Insulator contour optimization by a neural network

Contour optimization of axi-symmetric insulators in multi-dielectric arrangements by a neural network (NN) has been carried out to obtain not only a uniform but also a complex electric stress distribution along the insulator surface. Three case studies have been reported In detail. Multilayer feed-forward networks with error backpropagation and also with resilient propagation learning algorithms have been employed. The training and test data have been prepared by means of electric field calculations. The results show that optimized insulator contours have been obtained with an acceptable degree of accuracy with the help of a trained NN     

Detection of disconnection faults and double-phase short circuits in the wires of overhead transmission lines by the location method

The specific features of the detection of disconnection faults and double-phase short circuits in the wires of overhead transmission lines (OTLs), which have a tree topology with a voltage of 6–35 kV and a linear structure with a voltage of 110 kV and higher, have been studied. The techniques for interpreting reflectograms at failures in the wires of OTLs have been shown. Studies have been carried out under laboratory conditions using OTL models and under real conditions using operating OTLs.     

关于排汽联合装置除氧问题的研究

为了把空冷机组中的带凝结水箱的排汽装置,设计成具有内置除氧及加热功能的联合装置,文中提出了两种设计方案,详细讲述了设计原理,剖析了方案的优点和不足,同时也提出了需要解决的问题。为内置式排气联合装置的除氧方案提出了新的思路和方向。     

湛江电厂1号发电机定子冷却水处理方式的改造

简述发电机铜导线腐蚀机理,湛江电厂1号发电机定子冷却处理方式改造前后各自的特点。比较新旧两种方式水质处理效果、安全性、经济性。采用超净化装置后,解决了原来处理方式的所有缺点,水质达到质量标准, 创造良好的经济效益,值得推广改造和借鉴。