多楔带单根磨削机控制系统的改进

多楔带单根磨削机在调试时,存在步进电机只有正转不能反转的问题。在排除了步进电机驱动器、高速脉冲输出模块等硬件上的问题后,将高速脉冲输出模块设置成单脉冲控制方式,步进电机即可实现正、反转运行;如果程序中磨削进给量的分配是固定不变的,会产生磨削质量达不到要求,磨削效率低等问题。设计中采用磨削进给量和间隔时间都是变化的方法,可在保证产品质量的前提下提高生产效率。     

软启动器与SA828的结合应用

比较传统启动方式与软启动方式特点，简述软启动器的原理、功能。结合MCS-51系列单片机及PWM产生器SA828的特点，提出了一种用单片机实现的控制方法。     

韶山7E电力机车交流变频电动机的技术特点

交流变频电动机是电力机车的一种新装置，本文主要介绍了韶山7E电力机车交流变频电动机的技术特点。     

基于LabVIEW平台的数据采集系统中模拟量和脉冲量同步问题的探讨

同步问题是为了解决船模实验中同步采集拖车速度和其它物理量(模拟信号)而提出的。本文讨论了在LabVIEW环境下所能考虑到的所有的解决方法,详细说明了这些方法的实现,就其利弊及实验中出现的问题和结果作了深入的分析,并对各种方法进行了比较。     

“Can I play too?” Adapting common classroom activities for young children with limited motor abilities

This paper offers suggestions on adapting common classroom activities found in early childhood classrooms to increase participation of young children with limited motor abilities. It stresses the importance of de-emphasizing differences among children and highlighting that all children, even those with severe disabilities, can benefit from the same activities.     

数控机床三轴伺服电机安装——工程化教学案例实施

本文以数控机床三轴伺服电机安装为案例,结合自身数控机床装调与维修经验、课程项目工程化开发的经验及反思,积极探索研究数控机床装调与维修课程项目工程化的开发,建立一套具有职业教育工学结合的理论实践一体化的数控机床装调与维修专业方向课程项目工程化。     

电动汽车现状及未来

对电动汽车的关键技术进行了介绍,比较了电动汽车用各种型号电池的性能,总结了电动汽车用电动机需要满足的要求,及其动力总成的布局;对国内外电动汽车的现状进行了比较,并对其未来发展做了论述。     

Integrating Computer-Mediated Communication into an EAP course

The development of the computer along with the widespread use of the Internet has rapidly promoted Computer-Mediated Communication (CMC) as a very important communication media, which can be used widely and effectively in foreign language teaching and learning. This essay tries to explore the advantages of CMC as well as its proposed application, beginning with the introduction of some concepts related to CMC. From the research history, the rationale of using CMC in foreign language learning is summarised. The context of an EAP course is introduced and some suggestions on using CMC in this course are proposed.     

Application of stochastic method to optimum design of energy-efficient induction motors with a target of LCC

INTRODUCTIONMostcountrieshaveimplementednewpoli ciesontheenergysavingandenvironmentpro tection.AmericanPresidentBushsigned“TheComprehensiveNationalEnergyPolicyAct”in1992statingthatnogeneral purpose ,three phaseinductionmotorswillbeallowedintoUnit edStat…     

水喷雾灭火系统在柴油发电机房中的应用

介绍了水喷雾灭火系统的原理及其控制方式，并用一工程实例介绍了水喷雾灭火系统的设计。该系统的灭火特点使其在朴救可燃液体及电气火灾中得到广泛应用。