Er(Co1-xMnx)2合金的相变调控和磁热效应优化     

许家昊  姚杨  汪浩波  韩志达  房勇  钱斌  江学范 《常熟理工学院学报》2020,(2):4-6,29

研究了Mn掺杂对Er(Co1-xMnx)2合金的晶体结构、相变类型和磁热效应的影响.随着Mn含量的增加,合金的晶体结构不变,但是晶格常数逐渐增加,同时居里温度逐渐升高.当x≤0.06时,样品的磁相变为一级相变,表现出较大的磁熵变;而x=0.08时,样品经历铁磁到顺磁的二级相变,磁热效应大大降低.在一级相变和二级相变的临界点x=0.06,样品具有较大的磁熵变,几乎没有磁滞现象.因此,将相变调控到一级相变和二级相变的临界点是优化磁热效应的一种有效方法.  相似文献   

Is It a Challenge or a Threat? A Dual-Process Model of Teachers' Cognition and Appraisal Processes During Conceptual Change     

Michele Gregoire 《Educational Psychology Review》2003,15(2):147-179

What accounts for well-meaning teachers' lack of implementation of subject-matter reforms, such as making one's classroom centered on problem solving, even when they positively value the reform and believe they are implementing it in their classrooms? Teachers' subject-matter beliefs may constrain them from adopting practices that conflict with those beliefs. The purpose of this article is to propose a theoretical model, the Cognitive–Affective Model of Conceptual Change, that integrates key findings from overly cognitive models of belief change with motivational and affective factors found in social psychology theory and research. This model explains why teachers' beliefs about instruction are resistant to reforms that challenge their existing beliefs, and it provides a conceptual framework within which to devise a better means of advancing teachers' beliefs and supporting them in the process of implementation.  相似文献   

《秦妇吟》情韵结构探微     

唐韵 《青海师专学报》2002,22(2):60-63

叙事长诗《秦妇吟》自现世之日起，即受研究者瞩目，前代大家王国维，陈寅属等对其文学校勘，本事考证极为详赡，后人对其历史事实，思想意义也颇有研究，但鲜有人注意到此诗的声韵特色，本诗规模宏大，情境变换频繁，韵位转换繁密，且文随情转，情随韵迁，诗人实际上用声韵转换情境变换（叙事）和情感流程（抒情）融为一体。  相似文献   

Social anxiety in learning: stages of change in a sample of UK undergraduates     

Phil Topham  Naomi Moller  Hannah Davies 《Journal of Further & Higher Education》2016,40(1):125-145

Social anxiety in learning is prevalent amongst traditional-age students and has a marked effect on their engagement with higher education. It receives little attention from academic or support services and there is a presumption that students will manage their anxieties. Yet it is unclear what psychosocial resources they might bring to this task and how these may develop through the undergraduate years. This study sought to identify possible change processes in student social anxiety by analysing qualitative responses obtained from Level 2 undergraduate students (n=39) in relation to their experience of learning situations such as lectures, seminars and group presentations. Thematic analysis suggested a four-stage developmental progression for students in terms of their experience and orientation to coping with social anxiety. Implications for staff development and student support are outlined.  相似文献   

对传统农村家庭教育功能变迁的思考   总被引：1，自引：0，他引：1  

陈欢 《教育发展研究》2007,29(5):15-17

"民工潮"现象出现后,我国传统农村家庭教育功能呈现出新现象、新特点.本文以农村家庭模式划分理论为基础,进一步探讨了这一理论发展的趋向,并针对传统农村家庭教育功能变迁对子女社会化带来的不利影响,提出了若干建议与对策.  相似文献   

制度变迁是高校发展与管理效率提升的源泉     

柏育红 《荆门职业技术学院学报》2007,22(7):53-55

文章运用制度变迁理论,论述当代高校管理上一个具有主要意义的论题,--制度变迁是高校发展与管理效率提升的源泉。首先从制度变迁是经济发展与经济效率增长的源泉切入,进而推论出制度变迁是高校发展与管理效率提升的源泉,其次解析制度变迁推进高校发展与管理效率提升的三大机制,再次从分析制度对高校发展与管理效率的二重性作用入手,阐述高校制度变迁的必然性,最后在剖析当前我国高校发展与管理效率的五个方面制度性障碍的基础上,提出了颇具针对性、实用性与创造性的六项制度变迁措施。  相似文献   

Land cover change in Ningbo and its surrounding area of Zhejiang Province,1987～2000     

LU Shan-long SHEN Xiao-hua ZOU Le-jun 《浙江大学学报(A卷英文版)》2006,7(4):633-640

INTRODUCTION Land use and land cover change (LUCC) has become an increasingly important aspect of global environmental change and is a multi-disciplinary subject where geophysicist, bio-physicists and socio-economists meet one another. Land cover is an expression of human activities and, as such, changes with changes in land use and management (Louisa and Antonio, 2001), and land cover change could be regarded as change in biotic diversity, actual and potential productivity, soil quality…  相似文献   

普及型数控系统中随机自动换刀的实现   总被引：1，自引：0，他引：1  

张兆宇 《南通职业大学学报》2006,20(2):76-78

针对FANUC0MD系统,提出了通过编制PLC程序并结合宏程序以实现随机换刀的方法。通过设定刀具与刀座对应表,区分抓刀位置和送刀位置解决了PLC编程难点,并给出了随机自动换刀的PLC流程和M06宏程序。  相似文献   

陈寅恪论(中)     

蔡仲德 《南阳师范学院学报》2003,2(2):21-30

通过对陈寅恪学术贡献与学术观点的评估、对陈寅恪人特征与化取向的剖析、对陈寅恪研究中几个问题的讨论、对全面评价陈寅恪的若干思考，可得出结论，陈寅恪存在理智与情感的尖锐矛盾，理智上能清醒地看到中国旧化必然歇绝的历史命运，情感上却无法摆脱对此化的深深眷恋。不仅陈寅恪的《诗集》，而且陈寅恪的全部作，都是对这一化的余音不绝的挽歌。陈寅恪的思想基础不是人本主义，而是民族主义、国家主义，他所追求和维护的不是“天下万世的真理”，而是囿于一时间(前现代)、一地域(封建中国)的终将归于不可救疗之局的纲常名教。陈寅恪不是一个真正的自由主义，而是一个坚定的保守主义。  相似文献   

从文化的视角看西部高等教育观念的转变     

左兵 《煤炭高等教育》2005,23(2):40-43

西部高等教育与中东部存在着巨大的差距。面对新的历史机遇，西部高等教育要实现跨越式发展，转变观念是其逻辑前提。西部深厚的历史文化底蕴和独特的多元化民族传统，是西部高等教育办学理念的文化基础。西部高等教育要实现跨越式发展，只有在时间上与现代化相对接，在空间上与东部乃至世界相关联，才能在继承传统办学理念的基础上实现现代化的转型。  相似文献