基于Matlab的直流电动机双闭环调速系统的仿真研究     

王昊 《河北职业技术学院学报》2011,(5)

分析了直流调速系统的原理和工程设计方法,详细介绍了基于Matlab/Simulink的双闭环直流调速系统仿真和建模设计。教学实践表明,通过仿真可以帮助学生理解直流调速原理。  相似文献   

网球正手击球准确性的教具教学实验研究——以哈尔滨体育学院为例     

张旭辉 《哈尔滨体育学院学报》2013,(4):79-82

本文运用文献资料法、实验法等,以哈尔滨体育学院网球专修学生为研究对象进行教具教学实验,并对测试正手击球准确性进行,结果发现,有教具教学的实验组,击球准确性明显高于无教具教学的对照组,且此差距在实验后能持续提高。说明教具的合理使用能为学生练习提供目标和反馈,激发学生练习的积极性,促进学生积极思考,提高学生的学习效率。  相似文献   

Stick it in Your Ear: The Psychodynamics of iPod Enjoyment     

Joshua Gunn 《传播与批判/文化研究》2013,10(2):135-157

Through a sustained critique of the iPod and discourse about it, this essay advances a psychoanalytic rhetoric of music that characterizes listening experiences in terms of two psychical economies: the psycho-somatic or experiential and the symbolic. We argue that these economies work together to produce the fantasy of a “sonorous envelope,” a re/presentation of losing one's self in music. Because the dis/pleasurable experience of the sonorous envelope is a retroactively imposed understanding of an otherwise ineffable musical encounter, we argue for analyzing representations of the sonorous envelope in popular culture.  相似文献   

欧拉公式在电梯曳引力计算中的应用     

刘辉  刘晓红 《孝感职业技术学院学报》2009,12(4):86-89

曳引驱动电梯是由钢丝绳和曳引轮槽之间摩擦而产生曳引力来驱动轿厢作上下运动,钢丝绳对曳引轮的摩擦关系式符合欧拉公式。本文以欧拉公式为基础,推导出曳引力计算公式,并以实际电梯参数为例,计算出电梯在四种工作状况下的曳引力。  相似文献   

《信息技术》教学设计与实践探索——基于“合作型任务驱动”教学设计模式的尝试     

李子运  陈剑俊 《现代教育技术》2009,19(2):113-117,127

在高中《信息技术》课程的教学过程中尝试"合作型任务驱动"教学设计模式是本研究的重点。该模式融合了多种当代流行教学思想,结合信息技术课程的特点和当前学校教学的实际情况,具有可操作性。本文将该模式的设计、实践过程整理出来,并提供详实的案例和数据分析,为《信息技术》课程的教学提供参考。  相似文献   

基于MOEMS技术的光开关研究     

陈君 《衡水学院学报》2009,11(4):125-128

微光机电系统(MOEMS)技术是全光网络光开关的关键技术,在光通信器件研究中的应用能极大提高光通信器件的研发水平.为此,主要介绍了MOEMS光开关、国内外MOEMS技术的研究现状及MOEMS光开关的驱动方式,并指出了目前国内MOEMS光开关研究工作中存在的不足,以期对MOEMS光开关的研究者提供参考价值.  相似文献   

中国居民消费嵌入式碳排放增长的驱动因素研究     

汪臻  赵定涛  余文涛 《中国科技论坛》2012,(7):56-62

本文结合环境投入产出—生命周期分析(EIO-LCA)和结构分解分析(SDA),将1992—2007年中国居民消费嵌入式碳排放的增长,分解为生产系统和消费系统的驱动效应。研究结果表明:生产系统中因素的总效应始终为负值,消费系统中因素的总效应始终为正值,且后者的绝对值大于前者,进而引起嵌入式碳排放总量的增加。进一步研究发现,技术进步始终是抑制碳排放增长的最主要因素,而消费模式的改变已成为推动嵌入式碳排放增长的主要力量,且消费模式变化的增排效应强于技术进步的减排效应。基于以上分析,我们认为,目前仅仅针对生产系统的减排政策和措施并不能实现有效减排,减排需要生产系统和消费系统同时改进。除了技术节能外,我国还应把消费领域的节能作为"节能减排"一个重要内容,并采取更有力的措施来引导和促使居民消费模式向低碳方向转变。  相似文献   

Structuring academic conflicts between majority and minority students: Hindrance or help to integration     

David W. Johnson  Roger Johnson  Margaret Tiffany 《Contemporary educational psychology》1984,9(1):61-73

The effects of two types of structured academic conflict, controversy and debate, were compared with individual study in a study on desegregation. Seventy-two sixth grade students were assigned to conditions on a stratified random basis controlling for sex, reading ability, and ethnic membership. In all three conditions students studied a controversial issue with materials representing both pro and con views. In the controversy condition each learning group was divided into two pairs representing the pro and con sides. In the debate condition each member of a learning group was assigned a pro or con position to represent in a debate with the other three members. In the individualistic condition subjects were told to learn the material without interacting with other students and each student was given all the pro and con materials. The results indicate that controversy promotes the most cross-ethnic verbal rehearsal and exchange of the assigned material, the most concern that all students master the assigned material, the most active search for more information about the topic being studied, the most reevaluation of one's position and incorporation of opponents' arguments, the most liking for the subject matter and the instructional experience, the highest self-esteem, and the most accepting and supportive relationships among minority and majority students. The debate condition generated higher levels of these dependent variables than did individualistic study.  相似文献   

The effect of cooperative and individualistic learning experiences on positive and negative cross-handicap relationships     

Stuart Yager  Roger T. Johnson  David W. Johnson  Bill Snider 《Contemporary educational psychology》1985,10(2):127-138

The effects of cooperative and individualistic learning contingencies on interpersonal attraction, social acceptability, and self-esteem between handicapped and nonhandicapped fourth-grade students were tracked and compared. Sixty-nine students were assigned to conditions on a stratified random basis controlling for handicap, sex, and age. They participated in the study for 45 min a day for 54 instructional days during science class. Nonhandicapped peer ratings of the social acceptability of each handicapped student and several attitude measures were obtained four separate times at 18-day intervals. The results indicate that continued use of cooperative learning contingencies promote positive growth in interpersonal attraction, social acceptability, and self-esteem between handicapped and nonhandicapped students. The results also indicate that when cooperative learning contingencies are replaced with individualized learning contingencies, decay in the above-mentioned variables occurs.  相似文献   

机房软件快速构建     

黄国斌  吴蕾  易昌中 《宜春学院学报》2002,24(4):50-51,67

本文以Norton Ghost6.0为主要工具软件，并对其所提供的一对多复制的多播技术以RTL8139网卡为例，对网络机房软件的快速安装及快速维护，给出了详细的实现技术及操作过程。  相似文献