直流调速系统模糊控制器设计

传统的转速-电流双闭环直流调速系统结构简单、设计较为方便,在工业中得到了广泛的应用。然而由于PI控制算法的局限性,使得传统直流调速系统鲁棒性较差,不能满足高精度动态性能应用场合的控制要求。本文采用Fuzzy(模糊)—PID复合控制方式,把转速的偏差的大小的绝对值和偏差变化率的绝对值作为模糊控制器的输入,用来调整转速环节PID控制器、、三个参数,实现控制器参数的在线自调整功能。仿真说明了所用方法的有效性。     

On Your Mark,Get Set … Talk! The First-Ever NASIG Speed Rounds

This article examines the purpose, structure, and short-term outcomes of a new Strategy Session format introduced at the NASIG Twenty-Second Annual Conference. Borrowing from the trend in modern matchmaking known as speed dates, this interactive Strategy Session employed a moderated round robin format that brought publishers and librarians together to discuss serials topics of common interest. Limited by the clock, participants had the opportunity to ask questions and share thoughts from their perspectives as serials producers and serials consumers. Though of limited duration, discussions could touch on any topic related to the creation, use, and impact of serials in the participants' respective areas of work and interest. The Strategy Session was offered in two time slots on the first day of the conference.     

普通高校400m运动员速度、速度耐力训练负荷控制研究

通过对广州体育学院田径队短跑运动员速度、速度耐力及负荷控制等训练要素的实施,总结出短跑训练的指导思想和基本思路,为短跑训练的科学化、系统化提供实践指导。     

A security-embedded infrastructure for Tele-Traffic Speed Control

In this paper we introduce a novel approach, relying on intelligent engineering, whereby the maximum speed limit at which vehicles on the road can cruise is controlled from some central or distributed facility. The system, as designed, leverages the use of the ubiquitous cellular infrastructure to cut down the costs involved that would otherwise accrue as a result of the need to build a dedicated traffic control system.In the new system maximum speed limits are transmitted from a Central Control Facility (CCF) to all stretches of roads and highways dispersed across urban areas in a highly dynamic manner. The system uses information arriving via a dynamic feedback system on prevailing weather conditions, road conditions, and bulk of traffic, amongst others, before it would broadcast maximum speed limit information to various destinations. When deployed in its final release, this will be done using a highly automated system with little human intervention.The work presented in this paper elaborates the TTC Network Design and RSU Network Distribution for the Tele-Traffic Speed Control System, to remotely manage, enforce, and control the maximum speed limit allowed on road stretches in rural and urban areas for different vehicle categories.The new system has been deployed successfully in a laboratory controlled environment on three vehicle categories; one category representing passenger vehicles, another buses and commuter transport, while the third representing trucks and freight traffic. It is expected that when the system is fully deployed on the wireless infrastructure, speed-related traffic accidents will witness a drop by more than 65-70% according to known accident statistics.     

提高应用程序执行速度的几种方法

应用程序执行的速度越快越好。讨论了几种提高应用程序运行速度的方法和技术。通过编写实际应用程序,证明这些方法和技术非常适合应用在短时间内(如在帧周期里)处理并显示大量的像素点的应用程序中。     

雅典世锦赛跨栏运动员速度与时间参数分析

通过雅典田径世锦赛男子110m栏和女子100m栏决赛运动员速度、时间参数的统计处理与分析,表明最大栏间速度是决定成绩的关健因素,只有当最大栏间速度达到更高水平,保持速度的能力才更有意义;世界优秀跨栏运动员的成绩与平均过栏时间不存在显著性相关;从分段时间看,影响成绩的关键区域是第二和第三段。     

中外优秀男子跳远运动员速度特征比较分析

助跑是跳远技术的基础,助跑速度是决定跳远成绩的主要因素,而速度利用率则是素质水平和技术水平以及能力的体现。通过文献收集国内外部分优秀男子跳远运动员的跳远运动学参数和速度特征。针对跳远运动中,绝对速度与跳远成绩的关系,以及助跑速度、起跳速度、速度利用率等因素对跳远成绩的影响进行比较。结果表明,尽快提高跳远运动员短跑水平和绝对速度,在此基础上保持适宜的速度利用率增大腾起角度,使水平速度和垂直速度的配比更为合理,是提高我国优秀跳远运动员成绩的有效途径。     

Training of poor readers' phonological decoding skills: Evidence for syllable-bound processing

A flash card computer program designed to increase decoding speed in reading was evaluated with a sample of 55 eight- to twelve-year-old Dutch poor readers by using a pretest-training-posttest control group design. The reading level of the poor readers was comparable to the reading level of normal readers in grade two. After 8 weeks of practicing (twice a week) for 30 minutes per session, children in the training group showed substantial improvements in decoding speed not only on pseudowords directly practiced during the training, but also in untrained pseudowords and in existing words. The no-training control group did not improve in decoding speed from pre- to posttest. The results, furthermore, indicate that syllable-bound processes play a role in phonological decoding in Dutch, and that the flash card method used in this study stimulates poor readers to decode letter strings into syllabic units, which leads to an increase in decoding speed. The role of the syllable in phonological decoding and the potential of a specific flash card technique as a means to improve decoding skills of poor readers are discussed.     

影响英语阅读速度的因素及解决途径

较快的阅读速度是有效获取信息的前提。不良阅读习惯、词汇量欠缺、阅读方法不当是影响阅读速度和效率的主要因素，克服这些缺点有利于提高阅读速度。     

交流变频调速系统的特点及其重要作用

2 0世纪 6 0年代以后 ,由于电力电子技术、微机控制技术和矢量控制技术的发展 ,使得交流电机变频调速系统日趋完善 ,并且有取代直流调速系统的趋势。本文指出了交流变频调速系统的特点 ,从三个方面论述了交流变频调速系统的重要作用