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高效课堂是有教育教学理论指导的课堂; 高效课堂是教育教学环节顺序而完整的课堂; 高效课堂是注
重发挥“ 双主体( 教师是主导主体, 学生是学习主体) ”的课堂; 高效课堂是充满师生间思维碰撞的课堂; 高效课堂是
充满人文关怀的“ 人本课堂” ;高效课堂是激发师生总结和反思的课堂 相似文献
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大学物理是理工科的一门专业基础课,不仅是是整个自然科学的基础,而且是科学技术,尤其是高新技术的重要源泉,是极为重要的一门学科.本文结合多年的物理教学经验,对大学物理教学过程中存在的问题进行探讨以及提出一些改进的对策. 相似文献
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电磁振荡演示仪是用电流计来显示振荡电流的,其基本电路如图1所示。图中E是电源电动势,C是电容器的电容,L是振荡线圈的自感系数,R_L是振荡线圈的电阻,R_(?)是电流计的内阻。电流计的线圈自感系数与L相比甚小,略而不计。 相似文献
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《Journal of Geometry and Physics》2007,57(1):89-100
In this paper we study a generalized Darboux Halphen system given by where , , are real variables, are real constants and We prove that, for any , this system does not admit any non-constant global first integral that can be described by a formal power series. Furthermore, restricting the values of to a full Lebesgue measure set, we prove that this system does not admit any non-constant rational or Darbouxian global first integral. This is a first step toward proving that this system is chaotic. 相似文献
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With a view to get further insight into the integrability of a dynamical system, we investigate the complex invariant for a three-dimensional Hamiltonian system using the extended complex phase space approach (ECPSA) characterized by and . For this purpose the rationalization method is utilized and the invariant obtained is expected to play an important role in the study of the complex trajectories for the system of concern. 相似文献
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Rongjin Huang Laifeng Li Zhixiong Wu Xinxin Chu Xiangdong Xu Lihe Qian 《Solid State Communications》2010,150(35-36):1617-1620
Antiperovskite manganese nitrides (, 0.1, 0.15) were prepared and their negative thermal expansion, magnetic and specific heat properties were investigated. A frozen state with a freezing temperature was found at ~207 K in . This indicates that exhibits a spin glass state at low temperatures. We discussed the cause of spin glass behavior and correlated this spin glass behavior with broadening of the negative thermal expansion operation-temperature window of the manganese nitrides . 相似文献