异步电机矢量控制系统仿真研究   总被引：5，自引：0，他引：5  

张玉霞  刘海燕  张瑾  李晓梅 《大连大学学报》2005,26(2):44-47

异步电动机是一个高阶、非线性、强耦合的多变量系统.文中提出一种异步电动机矢量控制系统方案,并在此基础上设计了一个典型的矢量控制系统,然后利用matlab/simulink仿真软件对该控制系统进行建模与仿真研究.  相似文献   

异步教学与教育创新     

郑文发  赵复查 《韩山师范学院学报》2005,26(4):81-83,91

教育创新是由教育理念、教育目标、教育途径和教育方式所构成的教育体系，它体现在创造性的教学活动中，其目的是为了培养具有创造性人格、创造性思维和创造性技能的高素质人才。异步教学是黎世法经过20多年的潜心研究创立的具有创造性活力的教学模式，它是我国新时期基础教育实施新课程标准，培养创造性人才，强化素质教育的难得资源。异步教学与教育创新有十分密切的关系，它对培养、训练学生的创造性人格、思维和技能有独特的功能。  相似文献   

A tale of two mailing lists     

Martyn Wild 《Education and Information Technologies》1999,4(4):369-389

This paper serves to report a research study on the use made of two separate mailing lists or listservs, for professional development—Oz-Teachers and UK-Schools. Both lists were, and still are, used by teachers in Australia and the United Kingdom, as well as by teachers across the globe, to communicate electronically with each other. The practice of this communication is typically characterised by text messages that pose questions or offer answers; by threads of discussion based around single or combined themes; and by statements of information. In this context, two windows are opened in this study: one shows a dynamic picture of teachers at work and play in the technology of listservs, developing skills and practices in asynchronous communications. The other looks into the content of many of the postings, demonstrating the practices, views, ideas and concerns teachers have with using technology in traditional school and classroom environments. Whilst this paper provides a detailed overview of the study, the full report of the research programme, of which this study constitutes one part, can be found elsewhere, in Lankshear et al. (1997) and Wild (1999).  相似文献   

A Meta-Analysis of Approaches to Engage Social Work Students Online     

Dorothy Farrel  Kateri Ray  Telvis Rich  Zulema Suarez  Brian Christenson  Lisa Jennigs 《Journal of Teaching in Social Work》2018,38(2):183-197

ABSTRACT

With an increase in social work courses being offered in online and hybrid formats, it is imperative that social work programs understand the new teaching tenets and engagement mediums employed to meet the new Council on Social Work Education’s Educational Policy and Accreditation Standards. This meta-analysis explores best-practices pedagogy for student engagement using the delivery of content through both asynchronous and synchronous methods.  相似文献   

Teacher Perceptions of Moodle and Throughput in a Blended Learning Programme for In-Service Secondary School Mathematics Teachers     

Mdutshekelwa C. Ndlovu  Ingrid Mostert 《Africa Education Review》2018,15(2):131-151

The purpose of this article is to analyse teachers’ perceptions of using the modular object-oriented dynamic learning environment (Moodle) platform as a learning management system in a small-scale blended learning (b-learning) Advanced Certificate in Education (ACE) programme for in-service secondary school mathematics teachers in South Africa. It describes how the Moodle platform was used in combination with on-campus and later off-campus contact sessions for a widely dispersed population of 76 in-service mathematics teachers over a four-year period. Qualitative data was gathered by means of a questionnaire with open-ended items, while quantitative data was gathered from the centre's archives. The main findings were that Moodle enabled in-service teachers to experience social, cognitive and teaching presences, through synchronous and asynchronous discussions with peers and facilitators, and a teaching presence by submitting their inquiries and assignments online for facilitators to provide them with answers and feedback. The main obstacles to the integration of Moodle were limited availability of technology, slow speed, and unaffordable cost when available. With increased broadband connectivity Moodle holds the prospect for diversifying b-learning experiences that can support teachers’ professional learning outcomes and throughput for distributed populations of practising mathematics teachers, in particular.  相似文献   

论异步教育学派     

赵复查  陈平 《韩山师范学院学报》2002,23(3):89-93

由湖北大学黎世法从 1979年开始主持的教学改革课题———异步教学研究 ,以其旺盛的生命力迅速在全国各地生根、开花、结果 ,现已得到国内外的认可。异步教学研究课题无论是从理论还是从实践上都具有自己独特的风格 ,在二十多年的发展过程中积蓄了巨大的力量 ,已初步形成教育学派。对异步教育学派的研究 ,有助于对教学改革的深入认识 ,有助于提高基础教育的理论水平 ,特别是对实施素质教育有重大帮助 ,同时还能丰富我国教育科学理论的宝库。  相似文献   

Student and Teacher Perspectives in Computer-Mediated Learning Environments in Teacher Education     

Chiew Goh  Swee  Tobin  Kenneth 《Learning Environments Research》1999,2(2):169-190

Rapid advances in technology, particularly with the Internet, have led to the availability of numerous tools to support teaching and learning. This study involved the use of an Internet application, Connecting Communities of Learners (CCL), in courses for prospective teachers. Unlike earlier studies involving the use of the CCL, the context of this study related to full-time graduate students who used the CCL to augment weekly face-to-face instruction. An interpretive study was undertaken to ascertain student and teacher perceptions of the learning environments associated with the use of the CCL. Through the use of the CCL, students were able to be autonomous in regard to their own learning, co-participate with their peers and the instructor, and establish and maintain a community of learners in which participants could interact with others as co-teachers and co-learners. The CCL was perceived as a useful tool for building learning environments in which all participants can contribute written texts as evidence of what is known and as objects from which others can learn. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

异步电动机特性研究的(f、b、0)坐标法     

邹道生 《赣南师范学院学报》1999,(6):70-73

采用 (f、b、0 )坐标法 ,推导出适用于分析异步电动机在变频调速时稳态特性的基本表达式。  相似文献   

单片机在电动机软起动中应用     

王辉 《淮南职业技术学院学报》2009,9(3):25-27

近几年来,单片机已经被认为在现代文明和技术发展与进步中,起着越来越重要的作用;工业上,单片机技术有着广泛的应用,针对其应用的越来越广泛,提出了利用面向对象技术设计的方法,并将其用于以intel16位系列单片机8098为中央处理单元的电子软设计中;因为三相交流异步电动机启动电流过大,易烧毁或损坏电机,基于单片机系统、集成芯片和可控硅为辅助,提出了三相晶闸管交流调压的数字移相控制方法,通过控制触发角来控制输出电压,从而降低电动机的启动电流,使安全稳定的启动。这种方法具有其特点.即达到了延长异步电动机使用寿命的目的,具有故障显示及自诊断功能。  相似文献   

MSI中规模计数器设计课程中的教法探讨     

黄晓明 《培训与研究》2010,(8):126-129

在数字电子技术课程的教学中有一章专门讨论时序逻辑电路的分析与设计,随着MSI中规模芯片的普及,大量的MSI计数器芯片进入了教材。由于课时的限制,教师不可能全面讲授这类芯片的设计方法,从而导致许多同学在考研时或在毕业后的工作中遇到不同的MSI芯片设计时就会出现困难。为此在本文中,我利用多年的教学经验总结归纳了此类问题的相关特征和简便的设计方法,为在校电子专业学习的同学们和从事电子专业教学的教师们提供一个参考。  相似文献