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Two-dimensional relativistic electromagnetic dromion-like soliton in a cold transparent plasma 下载免费PDF全文
By using a standard multiple scale method, a Davey--Stewartson (DS) equation
has been derived and also applied to a multi-dimensional analytical
investigation on the interaction of an ultra-intense laser pulse with a cold
unmagnetized transparent electron-ion plasma. The regions of instability are
found by considering the modulation instability of a plane wave solution of
the DS equation. The DS equation is just of the Davey--Stewartson 1 (DS1) type
and admits a dromion solution, i.e. a two-dimensional (2D) dromion soliton
decaying exponentially in all spatial directions. A 2D relativistic
electromagnetic dromion-like soliton (2D REDLS) is derived for a vector
potential. 相似文献
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In the presence of an applied static and uniform magnetic field, a cylindrical Kadomtsev-Petviashivili equation is derived for a relativistic electromagnetic solitary wave propagating in collisionless plasma consisting electrons, positrons, and ions in the case of weak relativistic limit. This equation is solved in a stationary frame to obtain explicit expression for the velocity, amplitude and width of solitons. The amplitude of the solitary wave has a maximum value at a critical αc of the ratio of the ion equilibrium density to the electron one, and it increases as the applied magnetic field becomes larger. 相似文献
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学生自主选择教师上课的教学管理制度的宗旨是在教学中引入竞争机制, 使优胜劣汰的竞争机制在课
堂教学中发挥作用, 从而提升教师对本科教学的重视程度, 提升教师教学能力, 增加教师之间的沟通、 交流以及促进
教师对课程内容的深入研究. 在这种制度下, 学生可自主选择适合自己风格的教师听课, 即学生能主动参与到教学
活动中, 充分体现了“ 以学生为中心”的教学理念, 并调动了学生自主学习的积极性. 介绍了哈尔滨工业大学在大学
物理课程中实施学生自主选择教师上课制度的教学实践过程及获得的教学效果 相似文献
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