软起动器在邯钢5#高炉热风炉助燃风机上的应用

针对邯钢5#高炉热风炉原助燃风机串电抗器起动方式不能实现无冲击起动的缺陷,笔者在5#高炉扩容改造时采用了固态软起动器较好地解决了这一问题.     

2004年高压开关设备运行统计分析

文章给出了2004年国家电网公司系统7.2~550kV高压断路器的装用情况,重点对其在运行中的事故及障碍情况分别按类型、电压等级、事故责任分布进行了统计分析,对发生拒动、误动、绝缘、载流、外力及其他不同类型故障的原因进行了分析,指出了在专业管理中存在的问题,并提出了技术对策,以供电力系统运行部门和高压开关制造厂参考。     

VB中MSComm控件的设置与应用

介绍了利用VB的MSComm控件进行串行通信时的一些常用属性的设置,结合工程实例,给出了部分程序清单.     

完善新时期高校德育工作管理体系提高大学生综合素质

在当今信息时代,教育指数和人才素质的指标,在衡量一个国家发展水平和综合国力的评估体系中,占据越来越重要的位置,因而,培养高素质人才已经成为世界各国可持续发展的重要课题.我国高校既是人才的培养基地,又是对社会思想文化能够产生重要影响的知识分子的集散地;既是培养社会主义建设者的主要阵地,又是先进思想文化的传播中心.因此,高校德育工作成功与否,直接影响着社会主义现代化经济建设、政治建设和道德建设.     

LM331在温度测控中的应用

LM331是一种精密频率电压转换器。非常适用于用作模/数转换器。文中介绍了LM331的主要性能指标．同时给出了其与单片机8098的接口。     

基于蓄电池性能检测的交流恒流源设计

为了对蓄电池的性能进行在线检测和故障诊断．介绍了用以提供检测蓄电池的交流恒流源的设计思想和实现方法。通过实验进行了实例应用和验证，取得了较好的效果．为蓄电池的在线检测提供了一种实用的方法。     

基于双端口RAM的并口与89C51通信的电路设计

双端口RAM和增强型并口EPP是近年来研究的热点。本文通过对它们读写时序的详细探讨设计出了新的单片机和并口通信电路。该电路简单实用，可以较好地运用在数据采集系统中。     

Refinement of wavelength calibrations of hyperspectral imaging data using a spectrum-matching technique

The concept of imaging spectrometry, or hyperspectral imaging, is becoming increasingly popular in scientific communities in recent years. Hyperspectral imaging data covering the spectral region between 0.4 and 2.5 μm and collected from aircraft and satellite platforms have been used in the study of the earth's atmosphere, land surface, and ocean color properties, as well as on planetary missions. In order to make such quantitative studies, accurate radiometric and spectral calibrations of hyperspectral imaging data are necessary. Calibration coefficients for all detectors in an imaging spectrometer obtained in a laboratory may need to be adjusted when applied to data obtained from an aircraft or a satellite platform. Shifts in channel center wavelengths and changes in spectral resolution may occur when an instrument is airborne or spaceborne due to vibrations, and to changes in instrument temperature and pressure. In this paper, we describe an algorithm for refining spectral calibrations of imaging spectrometer data using observed features in the data itself. The algorithm is based on spectrum-matching of atmospheric water vapor, oxygen, and carbon dioxide bands, and solar Fraunhofer lines. It has been applied to real data sets acquired with airborne and spaceborne imaging spectrometers.     

A novel neural network for nonlinear convex programming

In this paper, we present a neural network for solving the nonlinear convex programming problem in real time by means of the projection method. The main idea is to convert the convex programming problem into a variational inequality problem. Then a dynamical system and a convex energy function are constructed for resulting variational inequality problem. It is shown that the proposed neural network is stable in the sense of Lyapunov and can converge to an exact optimal solution of the original problem. Compared with the existing neural networks for solving the nonlinear convex programming problem, the proposed neural network has no Lipschitz condition, no adjustable parameter, and its structure is simple. The validity and transient behavior of the proposed neural network are demonstrated by some simulation results.     

Cost-based cache replacement and server selection for multimedia proxy across wireless Internet

Multimedia proxy plays an important role in multimedia streaming over wireless Internet. Since wireless network exhibits different characteristics from the Internet, multimedia proxy caching over wireless Internet faces additional challenges. In this paper, we present a study of cache replacement for a single server and server selection for multiple servers across wireless Internet. By considering multiple objectives of multimedia proxy, we design a unified cost metric to measure proxy performance in wireless Internet. Based on the defined unified cost metric, we propose a novel replacement algorithm for single-server and a new server-selection policy for multiple servers to improve the end-to-end performance such as throughput, media quality, and start-up latency. To effectively handle errors occurred on wireless link, channel-adaptive unequal error protection is deployed according to distinct quality of service requirements of layered or scalable media. Simulation results demonstrate that our approaches achieve significantly better performance than the known cache-replacement algorithms and sever selection schemes, respectively.