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Using a variational approach,the propagation of a moderately intense laser pulse in a parabolic preformed plasma channel is investigated.The effects of higher-order relativistic nonlinearity (HRN) and wakefield are included.The effect of HRN serves as an additional defocusing mechanism and has the same order of magnitude in the spot size as that of the transverse wakefield (TWF).The effect of longitudinal wakefield is much larger than those of HRN and TWF for an intense laser pulse with the pulse length equaling the plasma wavelength.The catastrophic focusing of the laser spot size would be prevented in the present of HRN and then it varies with periodic focusing oscillations. 相似文献
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应用ＴＨＥＢＡＴ２．０和ＤＩＲＥＣＴＯＲ４．０两套多媒体创作软件，结合电子线路课程，制作了两套ＣＡＩ课件。本文分屏幕整体，文本，图形，图象，动画，视频，声音等七个方面进行了介绍。并对两套软件作了简单比较。 相似文献
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介绍了三相干式变压器温度检测控制仪的设计，分析了电路的工作原理及设计思路。对一些特殊电路进行了剖析，对整机的应用也作了简略介绍。 相似文献
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线段垂直平分线是初中数学几何部分非常重要的知识点，常在几何证明、计算、尺规作图中使用.考查方式通常比较灵活，且与角平分线结合考查时难度较高.基于此，本文对线段垂直平分线的四种常考题型进行分析，并以此为基础探究与垂直平分线有关的几何题的解决思路. 相似文献
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