学生主动参与学习艺术初探

教师在课堂上要注重学生主动参与,讲究学生积极参与学习的科学性、艺术性、和创造性,从而使你的课堂教学像火种,点燃学生心底的兴趣之火,像石块,贱起学生心灵港湾的兴趣之波,使课堂摆脱“闷气”和“匠气”,而充满“生气”和“灵气”。     

He-H_2 mixture and Er_3NiH_χ packing for the refrigeration enhancement of pulse tube refrigerator

The computation with the theory of modified Brayton Cycle indicates that higher cooling power and coefficient of performance for a pulse tube refrigerator can be achieved with He-H_2 mixture as working gas than those with pure He in the temperature region of 30 K. In addition, it is found that Er_3Ni, a regenerative material, is able to absorb H_2 and produces Er_3NiH_x. The computation presents that the regenerative performance of Er_3NiH_x is better than that of Er_3Ni due to its higher volume specific heat. Experimental results show that the pulse tube refrigeration performance in 30 K temperature region is enhanced greatly with He-H_2 mixture and Er_3NiH_x packing.     

用Backstepping方法实现一类混沌系统的同步

利用控制论中著名的backstepping方法,将发射系统的混沌输出作为目标态,则接收系统在类似的输入控制下,也将收敛到这个混沌轨道上,即实现了一类混沌系统的同步。仿真结果表明这种方法具有可以预先设定收敛速度、实现系统化设计策略、在全局范围同步等优点。     

加强物理实验教学,培养学生创新能力

本文在阐述创新能力内涵的基础上，就如何利用物理实验教学培养学生创新能力的方法、途径进行了较为深入的探讨。     

浅谈21世纪公共图书馆的读者参考咨询工作

21世纪人类已步入信息社会，公共图书馆将面临新的挑战，封闭式服务转为开放式服务，其核心在于如何加强原有的读参考咨询工作。