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Properties of Ternary One Dimensional Plasma Photomic Crystals for an Obliquely Incident Electromagnetic Wave Considering the Effect of Collisions in Plasma Layers 被引量:2
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作者 S. PRASAD Vivek SINGH A. K. SINGH 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第12期1084-1090,共7页
An analytical study is presented on the modal dispersion characteristics, group velocity, and effective group, as well as the phase index of a ternary one dimensional plasma photonic crystal for an obliquely incident ... An analytical study is presented on the modal dispersion characteristics, group velocity, and effective group, as well as the phase index of a ternary one dimensional plasma photonic crystal for an obliquely incident electromagnetic wave considering the effect of collisions in plasma layers. The dispersion relation is derived by using the transfer matrix method and the boundary conditions based on electromagnetic theory. The dispersion curves are plotted for both the normal photonic band gap structure and the absorption photonic band gap structure. It is found that the increase in the angle of incidence shifts the photonic band gap toward higher frequencies. Also, the cutoff frequency is independent of collisions. 展开更多
关键词 ternary plasma photonic crystal dispersion curves group and phase velocities obliquely incident collision effect
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全力防范偶发事件转化为大规模群体性事件——抓好源头治理和初期处置 被引量:1
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作者 郭经文 《吉林公安高等专科学校学报》 2009年第2期5-9,共5页
近年来,因偶发因素引发的群体性事件逐渐增多,社会危害极其严重,已成为影响社会和谐、稳定的突出问题,如不能有效加以防范和控制,极易引发社会骚动,甚至造成局部社会动荡。偶发事件引发社会骚动存在一定的必然因素,它反映的是我国社会... 近年来,因偶发因素引发的群体性事件逐渐增多,社会危害极其严重,已成为影响社会和谐、稳定的突出问题,如不能有效加以防范和控制,极易引发社会骚动,甚至造成局部社会动荡。偶发事件引发社会骚动存在一定的必然因素,它反映的是我国社会转型、经济转轨时期的深层次社会矛盾,所暴露出来的是政府职能部门及其党员干部在工作理念、工作机制、工作方式中存在的一些不足和弊端。 展开更多
关键词 偶发事件 群体性事件 偶发因素 政府职能 源头治理 初期处置
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