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耀斑激波的各向异性传播 被引量:1
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作者 胡友秋 《科学通报》 EI CAS CSCD 北大核心 1997年第17期1827-1829,共3页
对飞船观测和行星际闪烁记录的分析表明,耀斑激波的最快传播方向偏离耀斑法线:在赤道面内朝东偏转,在子午面内偏向日球电流片.即便扣除背景太阳风的对流效应,上述非对称传播特征仍然存在.可是,迄今对日球赤道面内耀斑激波的数值模拟给... 对飞船观测和行星际闪烁记录的分析表明,耀斑激波的最快传播方向偏离耀斑法线:在赤道面内朝东偏转,在子午面内偏向日球电流片.即便扣除背景太阳风的对流效应,上述非对称传播特征仍然存在.可是,迄今对日球赤道面内耀斑激波的数值模拟给出的最快激波传播方向几乎与耀斑法线平行,与观测结果相左.本文将证明,适当修改下边界的激波引入方式,可以获得最快传播方向东偏之结果. 既然耀斑源区随太阳自转,采用共转坐标系比较方便.在该坐标系中,日球赤道面内的理想 MHD二维平面流动满足如下方程: 展开更多
关键词 太阳耀斑 磁流体激波 耀斑激波 各向异性传播
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改进的基于样例修补的目标移除方法 被引量:13
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作者 彭宏京 侯文秀 宫宁生 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2006年第9期1345-1349,共5页
借助结构张量具有表达图像局部结构的性质,提出一种改进的区域填充图像修补方法.通过结构张量可以使图像的任意像素点的各个色彩分量获得一致的进化方向,其特征向量主导的目标块填充次序使得信息传播方式具有各向异性的特点.在真实自然... 借助结构张量具有表达图像局部结构的性质,提出一种改进的区域填充图像修补方法.通过结构张量可以使图像的任意像素点的各个色彩分量获得一致的进化方向,其特征向量主导的目标块填充次序使得信息传播方式具有各向异性的特点.在真实自然图像上移除巨大目标物的比较实验表明:文中方法比Criminisi的基于样例修补目标移除方法具有更合理的、视觉上更真实的修补效果. 展开更多
关键词 区域填充 图像修补 结构张量 各向异性传播 目标移除
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Calculation of seismic transmission speed of HTI medium
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作者 WANG Hongwei FAN Meining 《Global Geology》 2013年第4期221-225,共5页
During the seismic wave propagation process,as for the anisotropic lower medium,the speed is a function of the propagating direction.This article focuses on solving the problem how to get the transmittance angle and s... During the seismic wave propagation process,as for the anisotropic lower medium,the speed is a function of the propagating direction.This article focuses on solving the problem how to get the transmittance angle and speed,knowing the upper seismic wave propagation velocity and the angle of incidence conditions.The main theories used Snell law,Christoffel equation and speed characteristics.Taking the HTI medium as an example,the authors give the detailed solving process and draw the space velocity characteristic curve. 展开更多
关键词 EDA medium Snell law Christoffel equation speed characteristics
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Integral Equation Method for Electromagnetic Wave Propagation in Stratified Anisotropic Dielectric-Magnetic Materials
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作者 舒维星 付娜 +3 位作者 吕小方 罗海陆 文双春 范滇元 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第11期879-885,共7页
We investigate the propagation of electromagnetic waves in stratified anisotropic dielectric-magnetic materialsusing the integral equation method (IEM).Based on the superposition principle, we use Hertz vector formula... We investigate the propagation of electromagnetic waves in stratified anisotropic dielectric-magnetic materialsusing the integral equation method (IEM).Based on the superposition principle, we use Hertz vector formulations ofradiated fields to study the interaction of wave with matter.We derive in a new way the dispersion relation, Snell's lawand reflection/transmission coefficients by self-consistent analyses.Moreover, we find two new forms of the generalizedextinction theorem.Applying the IEM, we investigate the wave propagation through a slab and disclose the underlyingphysics, which are further verified by numerical simulations.The results lead to a unified framework of the IEM for thepropagation of wave incident either from a medium or vacuum in stratified dielectric-magnetic materials. 展开更多
关键词 integral equation stratified dielectric-magnetic materials extinction theorem METAMATERIALS
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Wavelength dependence of light propagation in a water suspension of anisotropic scatterers 被引量:2
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作者 SHI Fan ZHANG XinZheng +4 位作者 LI Jun WANG PiDong XU Yan YU XuanYi XU JingJun 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第11期1948-1952,共5页
We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles.First,the ballistic transmission in the visible range of the suspension is mea... We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles.First,the ballistic transmission in the visible range of the suspension is measured.The nonlinear relationship is observed between the transport mean free path and the wavelength of the incident light.Secondly,we measure the coherent backscattering (CBS) of the sample at different wavelengths.The full width at half maximum of the CBS cone at 532 nm is about 1.24 times as large as that at 671 nm.The results indicate that the light with a long wavelength propagates further than the short wavelength light and the localization state of the short one is stronger.Finally,we investigate the light-controllable CBS experiments in the disordered materials of anisotropic scatterers,which show that the configuration of pump light with the longer wavelength and the probe light with the shorter wavelength performs better. 展开更多
关键词 wavelength dependence light propagation in random media anisotropic scatterers light-control
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