稀土室温磁制冷材料Gd3Al2系列合金研究现状     

生利英 《包头职业技术学院学报》2013,14(1):29-30

针对室温磁制冷材料的研究现状,设计了以Gd3Al2合金为基础,通过加入Gd、Mn、Si和Zn等合金元素形成Gd3Al2系列合金,寻找合适的低磁场下的室温磁制冷材料。  相似文献   

Influence of ski materials on muscle activity     

J.P. Clarys  L. van Puymbroeck  J. Publie  E. Bollens  J. Cabri  B. de Witte 《Journal of sports sciences》2013,31(2):129-139

The purpose of this study was to examine whether differences in construction between the compact ski, the racing ski and the soft ski influence the behavioural and electromuscular responses of the user. Eight qualified male ski instructors performed two ‘shuss’ trials and three different basic turns. Six muscles (M. biceps femoris, M. gastrocnemius lateralis and medialis, M. rectus femoris, M. vastus lateralis and M. tibialis anterior) were studied, using a conventional but portable electromyographic (EMG) registration with telemetric synchronization, active electrodes and a six‐channel portable data recorder. Muscle contractions were continuously registered and visualized in raw EMG form and linear envelopes. The differences between the mean rectified EMG data of dynamic contractions while skiing and the mean rectified EMG data of the maximal voluntary contraction were used in the primary analysis of data, from which the participation levels of the muscles investigated could be calculated for each type of ski. Based on this comparison, differences between the effects on muscle activity of the three types of skis were unimportant. In a second phase, the normalized linear envelopes of all subjects were graphically superimposed and averaged. This was performed for each muscle, for each movement, for each leg and for each ski tested. The EMG data were considered in combination with anthropometric values, with snow characteristics and with the velocity of skiing. This study showed systematic differences between the use of the racing, soft and compact ski. On average the soft ski showed the lowest muscle activity patterns and thus the most economical muscular efforts for all muscles investigated and within all movements.  相似文献   

巧用美术材料 拓展表现空间     

丁颖 《佳木斯教育学院学报》2012,(4):211-211

美术的发展伴随着对材料的探寻和研究,当今创作者更加需要突破思维定势,变革、创新美术材料在作品中的应用方式和效果,尝试用复杂而又丰富的材料表现求新求异的艺术作品。初中美术课堂中,教师应及早开展巧用材料,拓展艺术表现空间的教育活动,传输创新使用材料也是创作的观念,引导学生开发利用身边可用资源,探究寻常美术材料的"特别"用法,在体验尝试中感受美术创作的乐趣。  相似文献   

五年制高职应用文写作教材的现状分析     

陈承 《佳木斯教育学院学报》2012,(7):219-219

教材在人才培养目标的实现过程中承担着重要的任务。但是,笔者对现有的应用文写作教材进行了一番比较与分析后,发现目前五年制高职校的应用文写作教材的使用现状不容乐观,本文对该问题进行了探究。  相似文献   

我国基础教育阶段使用英文原版教材进行英语教学初探     

乔静雅 《黑龙江教育学院学报》2012,(3):63-66

近年来,我国经济发达地区和中西部大中城市越来越多的中小学和幼儿园引进英文原版教材作为英语课教材或补充教材。由于受原版教材自身的特殊性以及与国内教材的差异等多种因素的影响,目前英文原版课程教学还存在不少问题。因此,学校和教师在使用英文原版教材时一定要根据我国的国情和学情,采取合理的应对措施,不断改进教学方法并提高教学水平。  相似文献   

非通用语种外语公共选修课课程及教材改革研究     

张晓晖 《黑龙江教育学院学报》2012,31(3):156-158

随着世界各国之间的合作的日益密切及交流的不断加深,非通用语种外语的重要性越发突出。德语、俄语、日语、法语、西班牙、朝鲜语等非通用语种外语公修课也成了非外语专业学生及渴望掌握多门外语的外语专业学生了解异国语言、文化的一大重要窗口,这也要求并进一步促进了非通用语种外语公共选修课课程及教材改革研究。  相似文献   

提高独立学院学生日语听力课后自主学习能力的思考     

林莉莉 《黑龙江教育学院学报》2012,(11):189-190

听力在语言运用能力中是至关重要的一个环节,如何提高独立学院学生课后自主学习能力已成为听力课程教学模式改革与创新的重要课题。基于此,通过分析听力课后自主学习的材料、任务及评估手段来探索提高学生课后自主学习能力的方法,以期全面提高独立学院的听力教学水平,实现日语教学的目标。  相似文献   

“教辅类产品评价”的必要性及可行性分析     

窦旭  张霄冰 《四川教育学院学报》2013,(8):79-81

当前教辅产品市场比较混乱,质量参差不齐,很多低劣产品混杂其中,不利于老师、家长和孩子的选用,甚至毒害孩子的心灵。整合社会资源,对教辅产品进行评价和规范,已成为当务之急。当前这种现状已经引起相关部门重视,且目前已经具备教辅类产品评价的条件。  相似文献   

Learning objects,repositories, sharing and reusability     

Tony Koppi  Lisa Bogle  Mike Bogle 《Open Learning》2013,28(1):83-91

The online Learning Resource Catalogue (LRC) Project has been part of an international consortium for several years and currently includes 25 institutions worldwide. The LRC Project has evolved for several pragmatic reasons into an academic network whereby members can identify and share reusable learning objects as well as collaborate in a number of ways. Collaboration through the LRC3 toolset may be concerned with the development or redevelopment of learning resources or for administrative and research purposes. For practical and particularly academic cultural reasons, the ‘catalogue’ itself has adopted a broad perspective on the nature of a ‘repository’. Many academic staff do not wish to give away their learning resources by uploading them to a public place but they may be prepared to describe the resources (objects) and retain control over their use. The LRC3 therefore includes a ‘distributed repository’ in that the objects may reside in many different places yet can be located through the catalogue which uses IMS‐based learning object metadata. The LRC3 also includes uploading of resources for people who wish to avail themselves of a central repository for their learning objects. A third aspect of ‘repository’ exists in the collaborative workspace whereby group members can upload their resources to enable sharing and development work within the group.  相似文献   

Dissolution-precipitation growth of uniform and clean two dimensional transition metal dichalcogenides     

Zhengyang Cai  Yongjue Lai  Shilong Zhao  Rongjie Zhang  Junyang Tan  Simin Feng  Jingyun Zou  Lei Tang  Junhao Lin  Bilu Liu  Hui-Ming Cheng 《国家科学评论(英文版)》2021,8(3)

Two dimensional transition metal dichalcogenides (TMDCs) have attracted much interest and shown promise in many applications. However, it is challenging to obtain uniform TMDCs with clean surfaces, because of the difficulties in controlling the way the reactants are supplied to the reaction in the current chemical vapor deposition growth process. Here, we report a new growth approach called ‘dissolution-precipitation’ (DP) growth, where the metal sources are sealed inside glass substrates to control their feeding to the reaction. Noteworthy, the diffusion of metal source inside glass to its surface provides a uniform metal source on the glass surface, and restricts the TMDC growth to only a surface reaction while eliminating unwanted gas-phase reaction. This feature gives rise to highly uniform monolayer TMDCs with a clean surface on centimeter-scale substrates. The DP growth works well for a large variety of TMDCs and their alloys, providing a solid foundation for the controlled growth of clean TMDCs by the fine control of the metal source.  相似文献