Modulational instability of ion—acoustic waves in a warm plasma

Using the standard reductive perturbation technique,a nonlinear Schroedinger equation is derived to study the modulational instability of finite-amplitude ion-acoustic waves in a non-magnetized warm plasma.It is found that the inclusion of ion temperature in the equation modifies the nature of the ion-acoustic wave stability and the soliton stuctures.The effects of ion plasma temperature on the modulational stability and ion-acoustic wave properties are inestigated in detail.     

利用T r a c k e r软件验证机械能守恒定律

T r a c k e r软件是一种广泛使用的视频分析软件. 利用T r a c k e r软件分别对单摆、 弹簧振子和自由落体运 动的实验视频进行分析, 通过自动追踪研究对象的运动轨迹, 同步描绘研究对象在运动过程中重力势能、 弹性势能 和动能随时间变化的图像, 验证了机械能守恒定律     

Effect of dust charge variation on dust—acoustic solitary waves in a magnetized two—ion—temperature dusty plasma

The effect of dust charge variation on the dust-acoustic solitary structures is investigated in a warm magnetized two-ion-temperature dusty plasma consisting of a negatively and variably charged extremely massive dust fluid and ions of two different temperatures. It is shown that the dust charge variation as well as the presence of a second component of ions would modify the properties of the dust-acoustic solitary structures and may exite both dust-acoustic solitary holes (soliton waves with a density dip) and positive solitons (soliton waves with a density hump).     

The KP and ZK equations for electrostatic waves with grain charge fluctuation

The propagation of three-dimensional nonlinear dust-acoustic and dust-Coulomb waves in unmagnetized/magnetized dusty plasmas consisting of electrons, ions, and charged dust particles is investigated. The grain charge fluctuation effect is also incorporated through the current balance equation. By using the perturbation method, a Kadomtsev－Petviashvili equation and a Zakharov－Kuznetsov equation governing the nonlinear waves in the unmagnetized and magnetized systems are obtained respectively. It has been shown that with the combined effects of grain charge fluctuation, the transverse perturbation, and the external magnetic field would modify the wave structures. Waves in those systems are unstable to the high-order long-wave perturbations.     

中学物理中的电磁感应佯谬现象

高中物理第二册电磁感应是中学物理教学中的重点和难点,也是中学生认为比较难理解和难把握的一部分内容.     

基于思维导图的“ 电磁感应”复习课教学设计

“ 电磁感应”这部分内容综合性强, 题目难度大且灵活性高, 学生难以理解各知识点间的联系与区别, 以致难以掌握解题的规律和技巧. 思维导图因具有发散、 递进的特点, 在复习该部分内容知识点时能够起到高效的 作用     

基于思维型课堂教学理论的 “ 物体的浮沉条件及应用”教学设计

本文以思维型课堂教学理论为依据, 遵循思维互动的核心思想, 探讨了以激发学生思维的积极主动性、 发挥思维的效能、 提高课堂教学的效果为目的初中物理课堂教学设计程序, 并将其应用于人教版初中物理“ 物体的 浮沉条件及应用”的教学设计中     

保守单摆系统中的复杂结构

讨论了保守单摆系统中随机层、混沌海及椭圆岛屿随扰动强度的复杂演变特征 ,并给出了保守单摆系统处于规则运动时的复杂结构     

薄透镜的会聚与发散问题讨论

详细讨论了薄透镜形状及透镜两侧介质对透镜的会聚与发散的影响 :当透镜两侧介质确定但不相同时 ,透镜的会聚与发散不但与透镜的凸、凹有关 ,而且与透镜及透镜两侧介质的折射率的相对大小有关 .特别是当像方折射率大于物方折射率时 ,会出现一些特殊情况     

保守单摆系统中的混沌运动

分析并数值模拟了受扰保守单摆系统中KAM环面的变形、扭曲、破裂及混沌出现的过程。