针阀体开裂原因实验分析     

陈亚军 《实验室研究与探索》2004,23(12):37-39

对针阀体使用中发生球头部位开裂的原因进行了硬度测定及金相检验等。结果表明,由于渗碳过程中,球头部位的尖角效应,使得该处碳势过高,导致球头部位出现网状碳化物,碳化物网状分布破坏了基体的连续性,从而降低了球头部位的疲劳强度,在交变高压油的作用下萌生微裂纹,并不断扩展导致球头出现开裂。  相似文献   

西方大学评价的权力模式   总被引：4，自引：0，他引：4  

刘凡丰 《清华大学教育研究》2002,23(3):71-74

本文把西方各国大学评价过程中表现出来的权力分配模式（大学自治与责任的相互作用模式）分为：英国，荷兰，美国三种模式，荷兰模式备受国际高等教育界推崇，这种模式在外部责任要求与大学自治之间达到了较为理想的平衡，这有可能使大学发展起组织学习文化。  相似文献   

试论学分制条件下高校学生工作的转型     

缪锐锋 《扬州大学学报(高教研究版)》2007,11(6):72-74

学分制改革是高校教育教学改革的必然趋势。学分制条件下,传统高校学生工作模式受到严峻挑战。通过转变学生工作理念、拓展学生工作阵地、建立导师制、完善学生综合素质测评体系、改革学生工作运行机制等措施可以有效实现学分制条件下高校学生工作的转型。  相似文献   

Influence of an integrated learning diagnosis and formative assessment-based personalized web learning approach on students learning performances and perceptions     

Charoenchai Wongwatkit  Niwat Srisawasdi  Gwo-Jen Hwang 《Interactive Learning Environments》2017,25(7):889-903

The advancement of computer and communication technologies has enabled students to learn across various real-world contexts with supports from the learning system. In the meantime, researchers have emphasized the necessity of providing personalized learning guidance or support by considering individual students’ status and needs in order to improve their learning performance. Based on this perspective, this study proposes a formative assessment-based approach for improving the learning performance of students in a personalized learning environment. An integrated learning diagnosis and formative assessment-based personalized web learning system was developed based on this approach. To evaluate the effectiveness of the proposed approach, an experiment was conducted in an elementary school mathematics course in Thailand. The experimental results showed that (1) the students learning with the proposed system revealed significantly better learning achievement and learning perceptions than those learning with the conventional learning system and (2) students’ learning perceptions of the system had significant relationships with their learning achievement.  相似文献   

Measurement invariance and validity of a brief questionnaire on reading motivation in elementary students          下载免费PDF全文

Franziska Stutz  Ellen Schaffner  Ulrich Schiefele 《Journal of Research in Reading》2017,40(4):439-461

In order to initiate more research on the role of reading motivation during the initial stages of learning to comprehend texts, we developed the Reading Motivation Questionnaire for Elementary Students (RMQ‐E). The sample comprised 1497 elementary students in Grades 1–3. By means of exploratory and confirmatory factor analyses, three factors were determined: Curiosity, involvement and competition. The three‐factor structure of the RMQ‐E was found to be invariant across grade levels (scalar invariance) and across female and male students (strict invariance). As was anticipated, students in higher grades and male students were lower in curiosity and involvement than students in lower grades and female students. Whereas competitive reading motivation did not differ across grade levels, it was higher for boys than for girls. Moreover, the contributions of involvement and competition to reading amount and reading competence were in accordance with the hypotheses. The predictive validity of curiosity, however, was not confirmed.  相似文献   

社区林业评估与科学的发展观     

王周绪 《高校教育管理》2008,(3)

如何在林业项目的建设中落实以人为本的科学发展观,是林业工作者一直探讨的重要课题。参与式社区林业评估方法起源于国外非政府组织在林业项目上的实践,引入我国大型林业项目已有十多年的历史。社区林业评估工作共有九个步骤,其核心就是要按照自然规律和当地社区的需求选择和开展项目活动。社区林业评估中要特别注意十个问题,最为重要的是要解决好参与问题。实践证明,社区林业评估是动员群众积极参与林业建设、落实科学发展观的一个好方法,值得推广。  相似文献   

西部地区中小学教师课堂教学评价标准调查     

胡定荣 《教育学报》2007,3(1):31-36

通过对中国西部地区162名中小学教师对评价一堂好课标准的问卷调查,结果表明:新课程倡导的教学理念得到部分体现;教师理想的评价标准和现实的评价标准之间存在差距;一堂课的评价标准具有一定的结构,指向善于讲解、设计环境、调动学生、运用手段、选择目标五个维度,学段、学科、性别、年龄对教师的评课标准不存在显著影响。  相似文献   

评估——高职院校改革与发展的助推器     

米兰 《北京工业职业技术学院学报》2007,6(3):81-84

高职高专院校人才培养工作水平评估,是我国高职教育改革与发展的内在要求,是政府依法行政、学校依法办学的重要举措.从实践效果看,评估有力地促进了学校教育教学观念的转变,办学思路的清晰,办学条件的改善,教学改革的深化,师资队伍的加强和教育管理的规范,实现了学校更好更快的发展.要巩固发展评估的成果,必须高度重视评估的整改工作,建立起评估的长效机制,不断推进高职院校的发展.  相似文献   

Application of Charpy Impact Absorbed Energy to the Safety Assessment Based on SINTAP     

王东坡邓彩艳  张玉凤霍立兴 《天津大学学报(英文版)》2006,12(2):116-120

The European Structural Integrity Assessment Procedure(SINTAP) was applied to the assessment of welded joints of the API 5L X65 pipeline steel with an assumed embedded flaw and surface flaw at the weld toe. At default level (level 0), the assessment point was established by estimating fracture toughness value KIC conservatively from Charpy energy test data. At the same time, the analysis level 1 (basic level)was applied based on the fracture toughness CTOD. Then the two assessment levels were compared. The assessment results show that all assessment points are located within the failure lines of analysis levels 0 and 1. So the welded joint of the pipeline is safe. It can be concluded that the assessment based on Charpy absorbed energy is practicable when other fracture toughness data are not available, or cannot be easily obtained. The results are conservative.  相似文献   

美国高校的学术反思与学术评价   总被引：29，自引：0，他引：29  

顾建民  董小燕 《高等教育研究》2002,(2)

20世纪 80年代末以来 ,美国高教界对美国高校中存在的学术评价日益窄化和教师奖励制度越来越片面的倾向进行了深刻反思。尤其是博耶在 90年代初发表的两篇文献 ,提出了包括发现的学术、综合的学术、应用的学术和教学的学术四种形式在内的新学术观 ,并构建了包括学者的品质、学术工作的标准、学术证明和过程的可靠性四条原则的新的学术评价体系。博耶的新学术观拓展了学术概念的内涵 ,涵盖了现代大学日益丰富的使命。他提出的学术评价四原则 ,对于纠正当前我国高校学术评价中普遍存在的简单化、公式化、数字化倾向具有重要的现实意义  相似文献