电力有源滤波器(APF)技术的探讨

随着大功率开关器件的广泛应用,电力系统谐波抑制及无功补偿问题变得日益迫切,电力有源滤波技术是解决上述问题的有效手段。首先简要介绍电力有源滤波技术的特点、基本原理,然后介绍APF的主要控制策略,最后对APF技术应用中应考虑的一些问题作简单介绍。     

Image segmentation via self-organising fusion

A method called self-organising fusion (SOF) for performing fast image segmentation is presented. The input image is divided into a set of small regions, each associated with a working feature. First, all regions are simultaneously updated and then a statistical process is applied to merge the qualified regions. The contours of objects are obtained by alternating the two processes of updating and merging until convergence. The concurrent updating creates a SOF behaviour that facilitates the identification of regions presumably comprising the same object. The method can save computation cost as both updating and merging are conducted in parallel fashion, and as parameter selection is done for local regions, it is able to deal with fairly complex images     

现代钢铁生产流程的优化与发展

现代钢铁生产流程进入新世纪后正加快优化的进程.紧凑、高效和智能化是主要发展方向;新流程发展和现有流程的改造相结合,是流程变革的主要特点;与多学科新技术的结合,将成为发展的主要特征;符合社会可持续发展的要求是钢铁流程优化最重要的目标.     

以职业培训促进人才开发

经济社会的发展,不仅需要大量的专业技术人才,也需要大量的职业技术工人.以职业培训促进人才开发,树立培训是基础,鉴定是手段,就业是目的,素质提高是关键的思想.     

Electroplated hard magnetic material and its application in microelectromechanical systems

We describe the preparation of CoNiMnP-based permanent-magnet material using several sulfate and chloride solutions. We studied eight samples, and all the samples show vertical magnetic anisotropy. Sample8, which was electroplated from a low-concentration chloride solution and under external magnetic field, demonstrates the best magnetic properties with coercivity 2632 Oe, remanence 0.20 T, and maximum magnetic energy 10.185 kJ/m/sup 3/. An array structure can avoid the stress between the electroplated layer and the seed layer. The electroplated Co/sub 0.8/Ni/sub 0.1174/Mn/sub 0.0062/P/sub 0.0762/ permanent magnet has potential for bidirectional actuators in micro-electromechanical systems.     

采用LabVIEW图形程式设计构成虚拟仪控设备

本文介绍了虚拟仪控的概念和LabVIEW图形程式语言的编程方法,性能特点,以及目前在广州地区的推广应用.     

学习新课标体会新理念

基础教育课程改革的浪潮滚滚而来,新课程体系有了重大的创新和突破.这场改革给教师带来了严峻的挑战,同时也给我们带来了不可多得的机遇.     

VC下实现基于Modbus协议的DCS与远程I/O系统通信

本文在分析Modbus协议及其通信原理的基础上，结合工程实际，提出了一种在工业PC机上实现串行通信的方法，并在Visual C 6．0环境下开发了通信的应用程序，实现了基于Modbus协议的DCS与远程I／O系统通信。     

振动式微机械陀螺的驱动模态的研究

本文针对的是振动式微机械陀螺自动增益驱动模态的研究.通常的振动式微机械陀螺的驱动模态采用交-直流电压变化的办法来获取振幅信号,然后通过反馈去控制驱动电压,从而达到恒幅振荡的效果.本文提出了一种直接由交流信号去控制驱动电压的方法,这就避免了由交-直流电压变化造成的延时,达到实时自动增益控制的效果.