组态王6．5在变电站无功补偿装置的监控实现与应用

针对变电站对无功综合动态补偿监控系统的要求，提出了利用组态王King View6．5组态软件和PLC构成的无功补偿控制器方案。介绍了其工作原理，King View6．5通讯组态技术，以及系统硬件和组态软件实施方案。     

S7-200 PLC在变电站无功综合控制装置的应用

针对变电站对无功综合动态补偿的要求,提出了利用西门子PLC和组态软件WinCC构成SCADA系统在变电站无功补偿控制器的应用方案.介绍了其工作原理,提出了新型无功补偿控制策略,以及PLC硬件和软件实施方案.     

组态王6.5在变电站无功补偿装置的监控实现与应用

针对变电站对无功综合动态补偿监控系统的要求,提出了利用组态王KingView6.5组态软件和PLC构成的无功补偿控制器方案。介绍了其工作原理,KingView6.5通讯组态技术,以及系统硬件和组态软件实施方案。     

基于MSP430的无功补偿系统设计与实现

针对电网中无功补偿问题,介绍了一种基于MSP430F449的无功补偿系统,简要地论述了系统的硬件和软件设计.系统能够通过430F449内部自带的A/DC12模块实现电流、电压的采集,同时利用定时器的捕获功能来计算信号相位差,求得输出控制量,控制自动投切并联补偿电容器组,实现系统的无功补偿.     

基于PLC的无功补偿控制系统

论述了无功补偿的重要性及并联电容器进行无功补偿的原理,分析了常用补偿方式及控制系统存在的问题,结合实际工程介绍了PLC无功补偿控制系统硬件及软件的设计方案.     

串行接口在嵌入式低压无功补偿控制中的应用

针对以往低压无功补偿系统的控制思想及实际运行效果,阐述了一种运用串行接口电路设计的嵌入式动态无功补偿控制应用系统,介绍了系统无功检测控制原理、控制系统硬件电路设计及软件实现。系统设计中采用串行接口集成电路来实现数据采集、显示驱动、数据存贮及输出驱动,使系统结构简单,可靠性高;系统控制方案以电压和无功缺额作为判据,彻底克服了投切振荡及过补偿问题,实现了电网无功功率的最大限度补偿。经实际试投运表明,系统方案设计合理,工作性能良好。     

基于CAN总线无功补偿控制设计

在分析传统低压无功补偿控制器现状和存在问题的基础上,提出一种基于单片机AT89C52的CAN总线实现的低压无功补偿的实施方案。介绍了其工作原理,CAN总线通讯组态技术,以及系统硬件和软件实施方案。     

基于DSP+CPLD的新型高压连续无功补偿控制器的研制

介绍一种基于软开关投切技术的高压连续无功补偿装置．并设计出适用于该方案的基于DSP＋CPLD的无功补偿控制器。详细给出了控制器硬件设计方案以及软件设计流程。将DSP和CPLD应用于无功补偿控制器。使得控制器硬件结构紧凑。可靠性和实时性都得到了很大提高。     

电力系统低压无功补偿技术

从无功补偿的基本原理入手,介绍了从提高功率因数需要提高补偿容量的计算方法,并进一步介绍补偿电容器的三角形接法及容量计算,在此基础上引入检测无功功率自动投切法,最后给出低压无功补偿系统框图及产品基于现场数据的模拟仿真图,并通过对比得出该无功补偿技术方法现实可行,效果突出。     

单片机智能无功补偿仪的设计

一般的无功补偿设备大部分都是固定式或开关投切式，控制环节多为分立元件构成，可靠性低。本文从无功补偿理论出发，基于8031单片机，设计并制造了一台无功补偿自动装置，给出了硬件结构及软件设计。本系统可以降低变压器容量使其得到充分利用，也使得电力线路、电气设备的能耗、电压波动有很大程度的降低。它弥补了过去补偿器的不足，硬件简化，软件编程方便，具有较高的可靠性和抗干扰能力，易于广泛使用和推广。所设计的无功补偿仪具有实时控制性、可靠性、经济性和多功能性等特点。     

Evidence-based recommendations for building better bras for women treated for breast cancer

Participating in exercise is beneficial for women who have been treated for breast cancer. However, not being able to find a comfortable exercise bra can be a barrier to exercise participation. This study aimed to systematically investigate what breast support women treated for breast cancer want when they exercise in order to provide evidence-based recommendations to improve exercise bra designs for these women. Based on 432 responses from a national online survey, frequency and relationship data were analysed (binary logistic regression) to understand exercise bra issues pertinent to this population. These issues included being able to control for asymmetrical cup sizes, managing heightened skin sensitivity, managing fluid (size) fluctuations, managing a prosthesis and restoring body image by restoring shape. This study provides evidence-based recommendations to inform an exercise bra design that will meet the unique needs of women treated for breast cancer. Rigorous, evidence-based evaluations of exercise bras for women treated for breast cancer may contribute to their well-being and quality of life through enhanced designs.     

为奥运喝彩 为中国加油

美齐九款液晶齐降价全球瞩目焦点2008北京奥运会已经开幕,美齐和所有中国人一起,为此次盛会的成功开幕欢欣鼓舞。与此同时,为了与广大消费者共享奥运激情,美齐(JEAN)宣布,在奥运期间举办为奥运喝彩的降价促销活动,一举将旗下的JT178R、JT198R、JT198F、JT209RP、     

医院多功能情报监控系统的研究

介绍了基于AT89S52单片机设计的医院多功能情报监控系统,该系统分为监测端和控制端2个部分.监测端位于病房内,和控制端通过CAN总线进行通讯,传递病房内的环境参数以及室内环境调节装置的控制信息.控制端位于控制室内,通过RS232与上位机通信,可以使用计算机上的C语言编译的人机对话界面,对各个病房的环境进行实时监测调节.     

Design for Testability for Complete Test Coverage

Some design-for-testability techniques, such as level-sensitive scan design, scan path, and scan/set, reduce test pattern generation of sequential circuits to that of combinational circuits by enhancing the controllability and/or observability of all the memory elements. However, even for combinational circuits, 100 percent test coverage of large-scale circuits is generally very difficult to achieve. This article presents DFT methods aimed at achieving total coverage. Two methods are compared: One, based on testability analysis, involves the addition of test points to improve testability before test pattern generation. The other method employs a test pattern generation algorithm (the FAN algorithm). Results show that 100 percent coverage within the allowed limits is difficult with the former approach. The latter, however, enables us to generate a test pattern for any detectable fault within the allowed time limits, and 100 percent test coverage is possible.     

Grammar engineering for multiple front-ends for Python

In this paper, we describe our experience in grammar engineering to construct multiple parsers and front ends for the Python language. We present a metrics-based study of the evolution of the Python grammars through the multiple versions of the language in an effort to distinguish and measure grammar evolution and to provide a basis of comparison with related research in grammar engineering. To conduct this research, we have built a toolkit, pygrat , which builds on tools developed in other research. We use pygrat to build a system that automates much of the process needed to translate the Python grammars from EBNF to a formalism acceptable to the bison parser generator. We exploit the suite of Python test cases, used by the Python developers, to validate our parser generation. Finally, we describe our use of the menhir parser generator to facilitate the parser and front-end construction, eliminating some of the transformations and providing practical support for grammar modularisation.     

Regional Process Modeling for Design for Environment

This research is an effort towards providing higher level Design for Environment (DFE) tools for a broad industrial region. Issues ranging from the levels immediately above existing design tools, to the envisioned highest level for a broad geographical region are discussed. A tool for the regional planning of the DFE activities is proposed, considering a model construction based on material flows across the industry. The Multi-Lifecycle approach is supported by organizing the input/output flows for industries, potentially utilizing waste material, side products and recycling. Capitalizing on the conceptual integration of the design and process activities, an Abstract Design Environment is used for the design of the basically process oriented material flow tool. Within the context, the relations among design, process and flow-modeling concepts are discussed.