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张国贤 《中国教育技术装备》2012,(26):120-121
运用现代信息技术辅助教学,不仅可以将抽象的教学内容具体化、清晰化,而且可以使学生的思维活跃起来,兴趣盎然地参与教学活动,使教师以教为主变成学生以学为主,从而优化教学过程,增强教学效果,提高教学质量。探讨信息技术在中学政治教学中的优点与运用原则,提出一些教学方法与实践经验。 相似文献
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Elastic metal plastic (EMP) journal bearing is a kind of original bearing. Because of the specialty of the composite materials,
elastic and thermal deformations of the EMP bush are much larger than that of common metal bush. In this paper, the three-dimensional
mathematical model is established to analyze thermo-elasto-hydrodynamics (TEHD) of EMP. The numerical TEHD analysis software
is programmed. An example is given to prove the lubrication performance of EMP.
Supported by the National Natural Science Foundation of China (59775037) 相似文献
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这次我们下放到农场还只短短的四十多天,每个人的收获却非常丰富。边学习、边劳动,不但没有如某些观潮派和反对派所料想的降低了教学质量,相反,质量是大大提高了!我们虽然是生物系三年级的学生了,但在生产中我们还是无知的小学生,尽管过去在植物分类学上学过“油菜系小白菜的变种,叶小而茎高……”但仍有同学分不清哪是油菜,哪是萝卜菜;学过鱼的知识,却不知道怎样培养鱼,学了猪、牛、羊的知识,不知道怎样饲养;学了菌类的理论,不能鉴别家畜和农作物的普通病害,更无法治疗。至于象有的同学站在肥土上嚷着找不到肥 相似文献
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德育工作作为学校管理的重点工作之一,其开展的教育活动需要围绕学生身心的成长特点,对于任何一个学校而言,培养具有优秀素质的人才定会受到德育管理工作的影响。因此,加强农村初中学校德育管理工作十分必要。新时期了解农村初中德育管理工作存在的不足,对其进行针对性的优化和整合,增强德育管理工作质量为初中教师首要思考的问题,以下为笔者对加强初中学校德育管理工作给予的相关分析与建议。 相似文献
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Ion-exchange polymer-metal composite （IPMC） is a new electroactive material. It has large deformation and high force weight ratio in the presence of low voltage （〈1.5 V）. In this study a soft actuator known as artificial muscle based on IPMC was prepared. The IPMC actuator is composed of a perfluorinated ion-exchange membrane and platinum plated on both sides of the membrane by chemical means. Experiences and some key points are introduced in preparation of the IPMC. Electromechanical behaviors of the actuator are investigated, Factors related to the actuator performance are discussed. 相似文献
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弹性金属氟塑料径向滑动轴承润滑特性的实验研究及建模仿真 总被引：1，自引：0，他引：1
In recent years, much attention has been devoted to the design and operation of bearings made of elastic metal plastic (EMP).The surface of the bearing bush is covered by a layer of polymer PTFE(polytetrafluoroethylene).The physical performances of the polymer are quite different from that of metal.It can reduce friction because of its lower surface energy, and it is more difficult for the fluid to be adhered.Consequently, the slip will exist at the oil-bush interface.The journal bearings made of this material are researched in this article.Through test, the existence of slip is proven and the equation of the slip velocity for the EMP journal bearing is established when shear stress up to a certain value.Thus, the classical Reynolds equation is modified.The lubrication mechanism is analyzed by some simulation results. 相似文献
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