基于逻辑法的长距离和多方向皮带输送机电气控制系统设计

采用S7-300作为主从控制器,西门子系列中压变频器为调速驱动进行长距离胶带输送机的系统设计,实现了多驱动器之间的协调控制。该方案中的变频装置及控制系统可适用于输送机类恒转矩负载的调速驱动过程。     

开放教育电工电子技术网络课程建设探析

开放教育《电工电子技术》课程由于其学科特点,在传统的教学形式下无论是理论知识还是操作技能教学都是学生开放学习的难点。通过网络课程建设,对网络环境下的《电工电子技术》教学设计的相关方面进行分析,其中包括网络教学形式和教学内容的多样性,实践环节的网络虚拟教学,以及网络教学的检测、评价等方面。     

高职机电一体化专业应用数学课程的整体设计

文章从实用性和发展性出发,结合机电一体化专业的特点,对高职机电一体化专业应用数学的课程目标、内容、考核评价体系进行了整体设计,提出采用适合机电类行业的真实任务的项目式教学模式,运用多种教学方法进行教学,实现导学做用一体化。     

22nd Annual NASIG Conference Registrants NASIG Conference 2007—Registrants by Last Name

The article provides an outline from an historical standpoint of how Italian cataloging rules have dealt with serials and gives a general picture of the current situation and trends. The most recent of the three national codes issued up to the present lime (1921,1956, and 1979) recommends the creation of a separate catalog for this type of publication in conformity with a national standard (UNI norm 6392) conceived outside the framework of the functions of the general library catalog. There exists, however, a substantially uniform cataloging tradition that allows access by title and deals with title changes in accordance with the principle of successive entry. The only existing national periodical file was created by the Istituto di studi sulla ricerca e documentazione scientifica (ISRDS) of the Consiglio nazionale delle ricerche (CNR), set up in conformity with UNI norm 6392. The existence of this file, whose records are to be adapted and converted, forms the basis of a government project to create a periodical file within the catalog of the National Library Service (SBN).     

Part III: The Cambridge Years

This is the third installment in Robert Berring's autobiography, The Education of a Twentieth Century Law Librarian. The first installment is at 32 Legal Reference Services Quarterly 1 (2013). The end of the traditional world of law libraries is chronicled through a study of the workings of the Harvard Law Library in the period 1978-1981. Computerized catalogs, changing styles of reference and difficult questions of management are explored. The painful transition that faced all libraries is discussed. This is the third installment of a five part series on the profound change in law libraries during this period.     

Super-2000 SCADA在配电通信系统中的应用

本文介绍了SUPER-2000系统在配电系统中的应用,它是在深入剖析了传统SCADA系统存在的缺陷和局限的基础上,采用全新思想、全新技术和全新策略开发完成的。本系统具有完备的SCADA功能,完全满足调度自动化设计技术规范和实用化验收功能技术规范,适应控制无人值守变电所运行的技术要求,配备完整的配电网自动化功能。     

基于办公自动化安全策略的研究

本文总结了办公自动化网络常见的安全问题及其后果,探讨了解决这些安全问题的方法,提供了基于网络内部的安全策略.     

配电网继电保护的现状与展望

文章论述了当前配电网中常见的继电保护类型,讨论了它们的优点和不足,并在此基础上分析和指出了配电网继电保护的发展方向.     

利用ActiveX Autom ation二次开发AutoCAD

介绍了使用 Active X Automation和 VB,Delphi进行 Auto CAD二次开发的原理和方法