Novel high torque bearingless two-sided rotary ultrasonic motor   总被引：3，自引：0，他引：3  

LI Xia CHEN Wei-shan XIE Tao LIU Jun-kao 《浙江大学学报(A卷英文版)》2007,8(5):786-792

Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide suffi-ciently high torque and power. The conventional travelling-wave USM needs the bearing to support, which required lubricant. To solve the above problem, a bearingless travelling-wave USM is designed. First, a novel structure of the two-sided USM consisting of a two-sided teeth stator and two disk-type rotors is designed. And the excitation principle of the two-sided travelling-wave USM is analyzed. Then, using ANSYS software, we set up the model of the stator to predict the excitation frequency and modal response of the stator. The shape of the vibration mode was obtained. Last, the load characteristics of the USM are measured using ex-perimental method. The maximum stall torque and the no-load speed were obtained. The results showed that the characteristics of the two-sided USM are better than those of the conventional one-sided USM.  相似文献   

集值映象与随机集值映象的几个不动点定理     

陈宁 《绵阳师范学院学报》1994,(Z1)

在本文中我们得到了关于集值映象与随机集值映象的几个新的不动点定理,扩充了[3]中结果,主要结果是定理1—3与定理6—7  相似文献   

浅议高校共青团学生干部队伍建设   总被引：1，自引：0，他引：1  

黄朝晖  陈林 《湖北成人教育学院学报》2004,10(6):15-16

本文论述了高等学校共青团学生干部队伍的重要性，并对如何进行高校共青团干部队伍建设进行了有益的探讨。  相似文献   

基于等级反应模型的CAT系统的研究和开发     

周婕  陈平  丁树良 《考试研究》2005,(3)

计算机化自适应测验是现代测验研究中的一个重要领域,而目前大多研究都基于0-1评分模型,适用范围不广。本文对Samejima等级反应模型进行探讨和研究,运用DELPHI开发研制多级评分计算机化自适应测验。  相似文献   

Teaching Against the Grain as an Act of Love: Disrupting White Eurocentric Masculinist Frameworks Within Teacher Education     

Ganiva Reyes  Rachel Radina  Brittany A. Aronson 《The Urban Review》2018,50(5):818-835

What is radical love in teaching? How can radical love incite change and transformation within teacher education? What does radical love entail to prepare critically minded teachers for urban schools? In this conceptual paper, we respond to these questions through our individual and collective experiences as social justice oriented teacher educators preparing students to teach in urban schools. We engage with our womanist ways of knowing (Walker in In search of our mothers’ gardens: womanist prose, Houghton Mifflin Harcourt, Boston, 2004) and “theory in flesh” (Moraga and Anzaldúa in This bridge called my back: writings by radical women of color, 2nd edn, Kitchen Table/Women of Color Press, New York, 1983) to collaboratively reflect and analyze our conversations, reflective journaling, meetings, and other telling moments about what it means to practice radical love in teaching. More specifically, we identify three central concepts of what love as an act of resistance or teaching against the grain entails: (1) vulnerability, (2) collective support and healing, and (3) critique. Through these concepts we offer a framework from which to practice radical love in teaching and work in solidarity with others to transform oppressive systems in urban (teacher) education.  相似文献   

着眼于主体发展:关于德育功能的新思考     

陈明龙 《高等工程教育研究》2006,42(5):53-57

本文从马克思主义关于人的本质理论和个体社会化理论出发,对传统的德育功能观做了系统考察,指出了传统德育功能观存在着的重大问题;概述了主体性德育的相关主张以及对于新德育功能观所做出的贡献。提出要将德育功能问题的考察还给德育本身;要站在主体性德育理论的成果上,着眼于德育对象(作为社会关系主体的人)的主体发展,从人的本质理论和个体社会化理论出发,来研究德育功能,确立一种新的德育功能观。  相似文献   

La Littérature De Jeunesse Entre Normes Pédagogiques Et Littéraires : Le Cas Des Pays Francophones D’afrique     

Kodjo Attikpoé 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2007,53(1):23-37

YOUTH LITERATURE IN THE CONTEXT OF PEDAGOGIC AND LITERARY NORMS: THE FRENCH-SPEAKING COUNTRIES OF AFRICA – There are two approaches to children’s and youth literature, one didactic, the other aesthetic. This gives rise to the following question: taking into account the fact that children’s literature aspires to be a literary form in its own right, should more weight be attibuted to its aesthetic value when evaluating it? This paper examines this question – which has in the past been the subject of highly controversial discussions in the German-speaking regions – by focusing on youth literature in the French-speaking coutries of Africa. The pedagogic dimension cannot be ignored when considering this literary context because it is so much a part of the post-colonial dynamic. Youth literature in the French-speaking countries of Africa echoes current realities. Examples are used to demonstrate how literature can deal with vital questions without neglecting the literary aspect.  相似文献   

美国本科教学的启示——以北亚利桑那大学为例     

陈永森  叶信治  俞姗 《长春工业大学学报(高教研究版)》2007,28(4):105-108

美国北亚利桑那大学本科教学具有如下特点:成熟且富有成效的管理制度、有序安排课程表和课程教学、丰富而高效的网络资源、相互协作的教学风格、学生的积极参与和充分的师生互动、多样而综合的考核方式等。北亚利桑那大学的本科教学对我国本科教学有很大启示,给学生更多自主选择、尽快完成数字化课程网络辅助教学平台建设、增加师生互动、综合考评学生等。  相似文献   

从高职学生就业流向看就业资源的重点开发     

陈国梁 《中国职业技术教育》2007,(24):54-55,57

解决高职毕业生就业问题除了发挥高职人才培养特色,强化学生职业素质,加强技能培训外,重点开发就业资源,形成稳定的毕业生就业市场,也是解决高职毕业生就业的重要途径。高职院校必须认真分析毕业生就业流向状况,开发与利用相对稳定的就业资源,保障高职教育事业的蓬勃发展。  相似文献   

结构多样化:现代高等教育发展趋势及启示   总被引：5，自引：0，他引：5  

康全礼  陈志强 《高教探索》2003,(1):28-30

现代高等教育在层次结构、形式结构、等级结构、部门结构等多方面都呈现多样化的趋势 ,这些对于我国高等教育的改革、发展和大众化进程具有重要的启示作用  相似文献