共查询到20条相似文献,搜索用时 229 毫秒
1.
文章从实验物理教学的范畴和性质出发,比较中外实验教学的差异,结合当前存在的问题,探讨理想的实验物理教学模式.提出实验物理教学应当以学生为中心,鼓励学生的自主创新精神和师生密切互动;发展实验教学中心应当以质量为重点,而不是盲目追求数量;努力把实验物理教学中心建设成为教学的平台、探索的基地、求知的乐园. 相似文献
2.
3.
4.
5.
6.
7.
8.
9.
QI An-shen 《理论物理通讯》1988,9(4):396-404
The approximate profiles of transversely deformed wave front solutions of a special kind of reaction-diffusion equations are investigated. A transformation for the wave variable is introduced. Then the problem is solved by using Gelerkin procedure. 相似文献
11.
12.
用自制的演示仪器,容易说明弹簧的形变主要是由金属丝的扭转引起的,借助于量纲分析及螺旋弹簧变形机理的二维模型,直接推导出螺旋弹簧的变形公式与劲度系数。 相似文献
13.
CHU CHUNG-YUAN AN ING 《中国物理C(英文版)》1977,1(1):47-51
In this paper the internal wave functions of mesons are obtained by solving the Bethe-Salpeter equation with a pseudoscalar covariant oscillator potential.The transi-tion probabilities of various weak and electromagnetic processes of mesons are calculat- ed by using these wave functions.The results are qualitatively in agreement with experiments.Quantitatively the results given are in good agreements with experi- ments for processes not involving π mesons,but are not so for processes involving π mesons,for which we give some speculative explanations. 相似文献
14.
15.
文中介绍一种在悬浮带电粒子云中模拟雷云放电的方法.试验表明,在合理的参数配合下在带电粒子云中可以获得放电通道达到2.5—3.0m的火花通道以模拟雷电放电.详细讨论了悬浮带电粒子云发生器的原理和构成;悬浮带电粒子云的基本特征;不同极性下放电的形式和特点.文中还比较了带电粒子云中的放电以及长空气间隙外加冲击电压时的放电,说明两种放电的一些特征参数比较接近. 相似文献
16.
利用旋转磁场驱动电流技术产生场反向磁场位形(FRC)。实验中未观察到任何等离子体不稳定性。FRC的寿命由所加旋转磁场的时间(40ms)决定。
关键词: 相似文献
17.
D.Y. ZHENGS.C. FAN 《Journal of sound and vibration》2002,255(2):243-259
This paper presents the derivation of the governing equations for the stability of vibration of an integrated system comprising a moving train and the railway track. The train consists of a convoy of articulated two-axle wagons. The equations are applicable to any arbitrary number of axles at arbitrary spacing. Each axle is modelled as a mass-spring-damper vibration unit. The railway track is an infinitely long Euler beam subjected to an axial compressive force and rests on a visco-elastic foundation. The governing equations for the integrated system are coupled differential equations, which can be transformed to algebraic equations by Fourier and Laplace transforms. Subsequent inverse Fourier transform and contour integration yield the instability equation. Critical parameter is identified. It follows by parametric studies on the instability of vibration due to different train configurations. Illustrative examples for trains having up to 20 wagons or 40 axles are given. 相似文献
18.
大量粒子系统的课程教学体系探讨 总被引:2,自引:1,他引:1
本文讨论了分布函数的概念、分布函数与熵的联系和最大熵原理。阐述了引入信息熵与最大熵原理对于大量粒子系统的课程教学体系改革的必要性和重要性。 相似文献
19.