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FDTD Simulation of Bistatic Scattering by Conductive Cylinder Covered with Inhomogeneous Time-Varying Plasma 被引量:1
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作者 刘少斌 刘三秋 袁乃昌 《Plasma Science and Technology》 SCIE EI CAS CSCD 2006年第2期190-194,共5页
A finite-different time-domain (FDTD) algorithm is applied in this paper to study the bistatic electromagnetic(EM) scattering by a conductive cylinder covered with inhomogeneous, collision, cold, time-varying plas... A finite-different time-domain (FDTD) algorithm is applied in this paper to study the bistatic electromagnetic(EM) scattering by a conductive cylinder covered with inhomogeneous, collision, cold, time-varying plasma. The collision frequency of plasma is a function of the electron density and the pressure of the background gas. The plasma density follows any prescribed distribution function of the rise time of plasma and the radius of the column. The bistatic radar cross section (RCS) of the conductive cylinder covered with inhomogeneous time-varying plasma and inhomogeneous steady-state plasma is calculated under different conditions. The results illustrate that a plasma cloaking system can successfully reduce the RCS of the conductive cylinder. 展开更多
关键词 plasma sheath radar cross section (RCS) inhomogeneous time-varying plasma electromagnetic wave FDTD electromagnetic scattering
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THE ELECTROMAGNETIC SCATTERING OF A RADIALLY INHOMOGENEOUS DIELECTRIC CYLINDER
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作者 张守融 王卫延 《Journal of Electronics(China)》 1990年第1期83-87,共5页
A new method is demonstrated for solving the electromagnetic scattering problemof a radially inhomogeneous lossless or lossy dielectric cylinder by Fourier series expansion.Com-pared with other methods,the method is s... A new method is demonstrated for solving the electromagnetic scattering problemof a radially inhomogeneous lossless or lossy dielectric cylinder by Fourier series expansion.Com-pared with other methods,the method is simpler in numerical calculation and can be used forsolving scattering problems of a cylinder due to an arbitrary incident electromagnetic beam. 展开更多
关键词 scattering LOSSY DIELECTRIC CYLINDER Radially inhomogeneous
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THE INVERSE ELECTROMAGNETIC SCATTERING OF INHOMOGENEOUS DIELECTRIC THIN TUBES
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作者 王卫延 张守融 《Journal of Electronics(China)》 1989年第4期337-342,共6页
By using the method of Fourier series expansion, the inverse electromagnetic scattering problemof a 2- dimensional lossy dielectric body, of which the cross section is a narrow annulus, is studied. Theanalytic express... By using the method of Fourier series expansion, the inverse electromagnetic scattering problemof a 2- dimensional lossy dielectric body, of which the cross section is a narrow annulus, is studied. Theanalytic expressions of the electric parameters of a dielectric body are given in terms of the outsidesca,ttering field, and the simulative results are satisfactory. 展开更多
关键词 inhomogeneous dielectric BODY INVERSE scattering Parameter reconstruction.
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A STUDY ON EM SCATTERING OF A TWO-DIMENSIONAL INHOMOGENEOUS STRUCTURE BURIED IN STRATIFIED MEDIA
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作者 Wang Weiyan Zhang Shourong(Institute of Electronics, Academia Sinica, Beijing 100080) 《Journal of Electronics(China)》 1997年第1期90-96,共7页
The TM-polarized electromagnetic scattering problem of a two-dimensional inho-mogeneous structure buried in lossy stratified media is presented. Analysis work consists of two parts mainly, derivation of the Green’s f... The TM-polarized electromagnetic scattering problem of a two-dimensional inho-mogeneous structure buried in lossy stratified media is presented. Analysis work consists of two parts mainly, derivation of the Green’s function of a filament buried in lossy stratified media and constitution of the electric field integral equation of the equivalent current caused by the differences between the inhomogeneities and the stratified media. Based on these works, illustrative numerical results are given to model inhomogeneous underground tubes in lossy stratified media, and to describe the scattering field affected by different factors such as permittivity distribution, dimension, and buried depth of the inhomogeneities and so on. 展开更多
关键词 EM scattering STRATIFIED media 2-D inhomogenEITY BURIED OBJECT
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Fast Single Image Haze Removal Method for Inhomogeneous Environment Using Variable Scattering Coefficient
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作者 Rashmi Gupta Manju Khari +4 位作者 Vipul Gupta Elena Verdú Xing Wu Enrique Herrera-Viedma Rubén González Crespo 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第6期1175-1192,共18页
The images capture in a bad environment usually loses its fidelity and contrast.As the light rays travel towards its destination they get scattered several times due to the tiny particles of fog and pollutants in the ... The images capture in a bad environment usually loses its fidelity and contrast.As the light rays travel towards its destination they get scattered several times due to the tiny particles of fog and pollutants in the environment,therefore the energy gets lost due to multiple scattering till it arrives its destination,and this degrades the images.So the images taken in bad weather appear in bad quality.Therefore,single image haze removal is quite a bit tough task.Significant research has been done in the haze removal algorithm but in all the techniques,the coefficient of scattering is taken as a constant according to the homogeneous atmosphere but in real time this does not happen.Therefore,this paper introduces a simple and efficient method so that the scattering coefficient becomes variable according to the inhomogeneous environment.Then,this research aims to remove the haze with the help of a fast and effective algorithm i.e.,Prior Color Fading,according to the inhomogeneous environmental properties.Thereby,to filter the depth map,the authors used a weighted guided image filtering which removes the drawbacks of guided image filter.Afterwards the scattering coefficient is made variable according to the inhomogeneous atmosphere and then the Simple Color Balance Algorithm is applied so that the readability property of images can be increased.The proposed method tested on various general outdoor images and synthetic hazy images and analyzed on various parameters Mean Square Error(MSE),Root Mean Square Error(RMSE),Peak Signal to Noise Ratio(PSNR),Mean Structural Similarity(MSSIM)and the Universal Objective Quality Index(UQI).Experimental results for the proposed method show that the proposed approach provides better results as compared to the state-of-the-art haze removal algorithms. 展开更多
关键词 Image dehazing scattering coefficient simple color balance inhomogeneous environment
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MULTIPLE SCATTERING THEORY OF EFFECTIVE MECHANICAL PROPERTIES OF INHOMOGENEOUS MEDIA
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作者 南策文 袁润章 +1 位作者 张清杰 蔡克峰 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1993年第4期13-23,共11页
The rate of hydrothermal reaction of SiO_2 and/or A1_2O_3 in the system of CaO-Al_2O_3-SiO_2-H_2O at 200℃ and the factors which influence the reactions are investigated by determining the reaction ratio.The rate of r... The rate of hydrothermal reaction of SiO_2 and/or A1_2O_3 in the system of CaO-Al_2O_3-SiO_2-H_2O at 200℃ and the factors which influence the reactions are investigated by determining the reaction ratio.The rate of reactions depends on the reactive activities of raw materials, initial composition of mixture and relative activity of SiO_2 and A12O3. The hydrothermal reaction can be accelerated by sodium hydroxide,in the case of silica,which has low activity, this is quite obvious. 展开更多
关键词 CPA MULTIPLE scattering THEORY OF EFFECTIVE MECHANICAL PROPERTIES OF inhomogeneous MEDIA ATA
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ANTI-PLANE SHEAR WAVES SCATTERING FROM A PARTIALLY DEBONDED MAGNETO-ELECTRO-ELASTIC CIRCULAR CYLINDRICAL INHOMOGENEITY 被引量:7
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作者 DuJianke ShenYapeng TianWeiping 《Acta Mechanica Solida Sinica》 SCIE EI 2004年第1期1-11,共11页
This article presents an analysis of the scattering of anti-plane shear waves from a single cylindrical inhomogeneity partially bonded to an unbounded magneto-electro-elastic matrix. The magneto-electric permeable bou... This article presents an analysis of the scattering of anti-plane shear waves from a single cylindrical inhomogeneity partially bonded to an unbounded magneto-electro-elastic matrix. The magneto-electric permeable boundary conditions are adopted. The crack opening displacement is represented by Chebyshev polynomials and a system of equations is derived and solved for the unknown coefficients. Some examples are calculated and the results are illustrated. The results show that the COD increases when the piezomagnetic coefficient of the inhomogeneity bonded to the piezoelectric matrix becomes larger, and that the COD decreases when the piezomagnetic coefficient of the matrix with the piezoelectric inhomogeneity increases. 展开更多
关键词 SH waves scattering magneto-electro-elasticity inhomogenEITY crack opening dis- placement
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INVERSE CONDUCTIVE MEDIUM SCATTERING WITH UNKNOWN BURIED OBJECTS
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作者 曲风龙 贾瑞雪 崔艳丽 《Acta Mathematica Scientia》 SCIE CSCD 2023年第5期2005-2025,共21页
This paper is concerned with inverse acoustic scattering in an inhomogeneous medium with a conductive boundary condition and the unknown buried impenetrable objects inside.Using a variational approach,we establish the... This paper is concerned with inverse acoustic scattering in an inhomogeneous medium with a conductive boundary condition and the unknown buried impenetrable objects inside.Using a variational approach,we establish the well-posedness of the direct problem.For the inverse problem,we shall numerically reconstruct the inhomogeneous medium from the far-field data for different kinds of cases.For the case when a Dirichlet boundary condition is imposed on the buried object,the classical factorization method proposed in[1]is justified as valid for reconstructing the inhomogeneous medium from the far-field data.For the case when a Neumann boundary condition is imposed on the buried object,the classical factorization method of[1]cannot be applied directly,since the middle operator of the factorization of the far-field operator is only compact.In this case,we develop a modified factorization method to locate the inhomogeneous medium with a conductive boundary condition and the unknown buried objects.Some numerical experiments are provided to demonstrate the practicability of the inversion algorithms developed. 展开更多
关键词 inverse acoustic scattering factorization method numerical reconstruction inhomogeneous medium
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Electromagnetic scattering from two parallel 2D targets arbitrarily located in a Gaussian beam 被引量:9
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作者 王运华 郭立新 吴琼 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第8期1755-1765,共11页
In this paper based on the equivalence principle and the reciprocity theorem, the scattered field up to second-order by two parallel 2D targets arbitrarily located in a Gaussian beam is considered. The first-order sol... In this paper based on the equivalence principle and the reciprocity theorem, the scattered field up to second-order by two parallel 2D targets arbitrarily located in a Gaussian beam is considered. The first-order solution can easily be obtained by calculating the scattered field from isolated targets when illuminated by a Gaussian beam. However, because of the difficulty in formulating the couple scattering field, it is almost impossible to find an analytical solution for the second-order scattered field if the shapes of 2D targets are not canonical geometries. In order to overcome this problem, in this paper, the second-order solution is derived by using the technique based on the reciprocity theorem and the equivalence principle. Meanwhile, the relation between the secondary scattered field from target #1 and target #2 is obtained. Specifically, the bi- and mono-static scattering of Gaussian beam by two parallel adjacent inhomogeneous plasma-coated conducting circular cylinders is calculated and the dependence of attenuation of the scattering width on the thickness of the coated layer, electron number density, collision frequency and radar frequency is discussed in detail. 展开更多
关键词 reciprocity theorem equivalence theorem electromagnetic scattering inhomogeneous plasma-coated conducting cylinders Gaussian beam
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Fast and accurate analysis of electromagnetic scattering from targets situated in dielectric half space 被引量:3
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作者 Yongpin Chen Zaiping Nie Jun Hu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第1期37-40,共4页
Electromagnetic scattering from targets situated in half space is solved by applying fast inhomogeneous plane wave algorithm combined with a tabulation and interpolation method. The integral equation is set up based o... Electromagnetic scattering from targets situated in half space is solved by applying fast inhomogeneous plane wave algorithm combined with a tabulation and interpolation method. The integral equation is set up based on derivation of dyadic Green's functions in this environment. The coupling is divided into nearby region and well-separated region by grouping. The Green's function can be divided into two parts: primary term and reflected term. In the well-separated region, the two terms are both expressed as Sommerfeld integral, which can be accelerated by deforming integral path and taking interpolation and extrapolation. For the nearby region, the direct Sommerfeld integral makes the filling of impedance matrix time-expensive. A tabulation and interpolation method is applied to speed up this process. This infinite integral is pre-computed in sampling region, and a two-dimensional table is then set up. The impedance elements can then be obtained by interpolation. Numerical results demonstrate the accuracy and efficiency of this algorithm. 展开更多
关键词 electromagnetic scattering dielectric half space fast inhomogeneous plane wave algorithm tabulation and interpolation.
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A NEW METHOD FOR SOLVING THE SCATTERING PROBLEM OF DIELECTRIC BODIES
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作者 王卫延 张守融 《Journal of Electronics(China)》 1989年第1期42-49,共8页
A new approach to the EM scattering problem of an inhomogeneous lossy dielectric body is pro-posed.It is shown that the entire interior electric field distribution can be obtained from the measured exteri-or field dis... A new approach to the EM scattering problem of an inhomogeneous lossy dielectric body is pro-posed.It is shown that the entire interior electric field distribution can be obtained from the measured exteri-or field distribution by simple recurrence relations.Detailed derivations of these recurrence relations for thefield distribution inside the scattering body are presented,and the results obtained by computer simulationsare given. 展开更多
关键词 inhomogeneous dielectric BODY EM scattering CAA RECURRENCE
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Scattering characteristics of conducting cylinder coated with nonuniform magnetized ferrite
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作者 胡斌杰 容启宁 +1 位作者 张军 Toutain Serge 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第11期2305-2313,共9页
An analytical technique, referred to as the scattering matrix method (SMM), is developed to analyse the scattering of a planar wave from a conductolution for the nonuniform fering cylinder coated with nonuniform mag... An analytical technique, referred to as the scattering matrix method (SMM), is developed to analyse the scattering of a planar wave from a conductolution for the nonuniform fering cylinder coated with nonuniform magnetized ferrite. The SMM srite coating can be reduced to the expressions for the scattering and penetrated coefficients in four particular cases: nonuniform magnetized ferrite cylinder, uniform magnetized ferrite-coated conducting cylinder, uniform ferrite cylinder as well as homogeneous dielectric-coated conducting cylinder. The resonant condition for the nonuniform ferrite coating is obtained. The distinctive differences in scattering between the nonuniform ferrite coating and the nonuniform dielectric coating are demonstrated. The effects of applied magnetic fields and wave frequencies on the scattering characteristics for two types of the linear profiles are revealed. 展开更多
关键词 scattering inhomogeneous ferrite conducting cylinder scattering matrix method
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Numerical Solutions of the Electromagnetic Scattering by Overfilled Cavities with Inhomogeneous Anisotropic Media
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作者 Meiling Zhao Jiahui He Liqun Wang 《Communications in Computational Physics》 SCIE 2023年第7期530-562,共33页
In this paper,the electromagnetic scattering from overfilled cavities with inhomogeneous anisotropic media is investigated.To solve the scattering problem,a Petrov-Galerkin finite element interfacemethod on non-body-f... In this paper,the electromagnetic scattering from overfilled cavities with inhomogeneous anisotropic media is investigated.To solve the scattering problem,a Petrov-Galerkin finite element interfacemethod on non-body-fitted grids is presented.We reduce the infinite domain of scattering to a bounded domain problem by introducing a transparent boundary condition.The level set function is used to capture complex boundary and interface geometry that is not aligned with the mesh.Nonbody-fitted grids allow us to save computational costs during mesh generation and significantly reduce the amount of computer memory required.The solution is built by connecting two linear polynomials across the interfaces to satisfy the jump conditions.The proposed method can handle matrix coefficients produced by permittivity and permeability tensors of anisotropic media.The final linear system is sparse,making it more suitable for most iterative methods.Numerical experiments show that the proposed method has good convergence and realizability.Meanwhile,we discover that the absorbing properties of anisotropic media clearly and positively influence the reduction of radar cross section.It has also been demonstrated that the method can achieve second-order accuracy. 展开更多
关键词 Electromagnetic scattering overfilled cavity inhomogeneous anisotropicmedia nonbody-fitted grids Petrov-Galerkin finite element interface method
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In-plane bistatic backward scattering from seabottom with randomly inhomogeneous sediment and rough interface 被引量:8
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作者 PENG Zhaohui1,,ZHOU Jixun1,& ZHANG Renhe1 2 2 1.Institute of Acoustics,Chinese Academy of Sciences,Beijing 100080,China 2.School of Mechanical Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2004年第6期702-716,共15页
The in-plane bistatic backward scattering caused by seabottom with random inhomogeneities and rough interface is studied. This work combines the ray tube integral method of Ivakin et al. and the complex-ray/steepest d... The in-plane bistatic backward scattering caused by seabottom with random inhomogeneities and rough interface is studied. This work combines the ray tube integral method of Ivakin et al. and the complex-ray/steepest descent method of Hines. For a given incident grazing angle, the theoretical expression can easily be used to calculate scattering strength for different backward scattering angles. (This is essential for modeling shallow water reverberation by the normal mode approach.) The model is tested against published scattering measurements. The frequency/angle dependence of backward scattering and effects of volume inhomogeneity parameters on backward scattering are also discussed. 展开更多
关键词 IN-PLANE BISTATIC BACKWARD scattering inhomogeneous sediment ROUGH interface.
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Multi-hybrid method for investigation of EM scattering from inhomogeneous object above a dielectric rough surface 被引量:2
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作者 LI Jie GUO LiXin +1 位作者 HE Qiong WEI Bing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第10期1781-1790,共10页
An iterative strategy combining Kirchhoff approximation (KA) method is presented in this paper to study the interactions between KA is applied to study scattering from underlying rough surfaces with the hybrid finit... An iterative strategy combining Kirchhoff approximation (KA) method is presented in this paper to study the interactions between KA is applied to study scattering from underlying rough surfaces with the hybrid finite element-boundary integral (FE-BI) the inhomogeneous object and the underlying rough surface. whereas FE-BI deals with scattering from the above target. Both two methods use updated excitation sources. Huygens equivalence principle and an iterative strategy are employed to consider the multi-scattering effects. This hybrid FE-BI-KA scheme is an improved and generalized version of previous hybrid Kirchhoff approximation-method of moments (KA-MoM). This newly presented hybrid method has the following advantages: (1) the feasibility of modeling multi-scale scattering problems (large scale underlying surface and small scale target); (2) low memory requirement as in hybrid KA-MoM; (3) the ability to deal with scattering from inhomogeneous (including coated or layered) scatterers above rough surfaces. The numerical results are given to evaluate the accuracy of the multi-hybrid technique; the computing time and memory requirements consumed in specific numerical simulation of FE-BI-KA are compared with those of MoM. The convergence performance is analyzed by studying the iteration number variation caused by related parameters. Then bistatic scattering from inhomogeneous object of different configurations above dielectric Gaussian rough surface is calculated and the influences of dielectric compositions and surface roughness on the scattering pattern are discussed. 展开更多
关键词 electromagnetic scattering hybrid method rough surface inhomogeneous target
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TWO-DIMENSIONAL VECTOR RADIATIVE TRANSFER EQUATION FOR INHOMOGENEOUS SCATTERING MEDIA
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作者 金亚秋 《Chinese Science Bulletin》 SCIE EI CAS 1991年第1期29-32,共4页
In the last decade or so the radiative transfer (RT) theory has been widely applied to the numerical simulations of scattering and thermal emission in both passive and active remote sensing. However, the model of scat... In the last decade or so the radiative transfer (RT) theory has been widely applied to the numerical simulations of scattering and thermal emission in both passive and active remote sensing. However, the model of scattering media has been largely restrictive to the horizontallyinfinite, stratified random media where the scatterers are homogeneously and randomly distributed. Correspondingly, the RT equation is one-dimensional (1-D). Recent 展开更多
关键词 inhomogeneous scattering media 2-D RADIATIVE transfer REMOTE sensing.
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Inverse scattering transforms of the inhomogeneous fifth-order nonlinear Schrodinger equation with zero/nonzero boundary conditions
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作者 Jin-Jin Mao Shou-Fu Tian +1 位作者 Tian-Zhou Xu Lin-Fei Shi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第8期56-68,共13页
The present work studies the inverse scattering transforms(IST)of the inhomogeneous fifth-order nonlinear Schrodinger(NLS)equation with zero boundary conditions(ZBCs)and nonzero boundary conditions(NZBCs).Firstly,the ... The present work studies the inverse scattering transforms(IST)of the inhomogeneous fifth-order nonlinear Schrodinger(NLS)equation with zero boundary conditions(ZBCs)and nonzero boundary conditions(NZBCs).Firstly,the bound-state solitons of the inhomogeneous fifth-order NLS equation with ZBCs are derived by the residue theorem and the Laurent's series for the first time.Then,by combining with the robust IST,the Riemann-Hilbert(RH)problem of the inhomogeneous fifth-order NLS equation with NZBCs is revealed.Furthermore,based on the resulting RH problem,some new rogue wave solutions of the inhomogeneous fifth-order NLS equation are found by the Darboux transformation.Finally,some corresponding graphs are given by selecting appropriate parameters to further analyze the unreported dynamic characteristics of the corresponding solutions. 展开更多
关键词 the inhomogeneous fifth-order nonlinear Schrodinger equation inverse scattering transforms Darboux transformation bound-state soliton rogue wave zero/nonzero boundary conditions
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混合散射体的分解方法
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作者 王昱皓 曲风龙 《烟台大学学报(自然科学与工程版)》 CAS 2023年第3期264-273,共10页
考虑混合散射体在时谐声波散射下的反散射问题,该散射体是由具有导电传输边界的可穿透非齐次介质和具有阻抗边界的不可穿透障碍物组成。首先利用变分方法证明正问题解的适定性,然后基于远场数据利用分解方法同时反演混合散射体的位置和... 考虑混合散射体在时谐声波散射下的反散射问题,该散射体是由具有导电传输边界的可穿透非齐次介质和具有阻抗边界的不可穿透障碍物组成。首先利用变分方法证明正问题解的适定性,然后基于远场数据利用分解方法同时反演混合散射体的位置和形状,最后给出数值算例来验证提出的反演算法的有效性。 展开更多
关键词 分解方法 混合反散射 变分方法 非齐次介质
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高能闪光照相中钨球散射规律研究 被引量:13
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作者 施将君 李必勇 +2 位作者 宗嵩 刘军 刘进 《强激光与粒子束》 EI CAS CSCD 北大核心 2004年第4期526-530,共5页
 用解析法和Monte Carlo法研究了钨球闪光X光照相的散射照射量空间分布随钨球半径、系统中元件构成以及保护器件与记录平面间距的变化规律。指出散射照射量的空间分布是不均匀的,它随球半径增加而变大;保护器件是散射照射量的主要来源...  用解析法和Monte Carlo法研究了钨球闪光X光照相的散射照射量空间分布随钨球半径、系统中元件构成以及保护器件与记录平面间距的变化规律。指出散射照射量的空间分布是不均匀的,它随球半径增加而变大;保护器件是散射照射量的主要来源,增加从保护器件到记录平面的距离,可以降低散射分布不均匀性,以及有效地减少散射。 展开更多
关键词 钨球 保护器件 散射照射量 直散比 散射分布不均匀性
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凝胶结构非均匀性的静态光散射研究 被引量:5
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作者 徐建宽 何明霞 +2 位作者 何志敏 左榘 安英丽 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2000年第2期125-128,共4页
提出了一种利用同一角度静态光散射测量来研究透明聚合物凝胶结构非均匀性的新方法 ,并以聚丙烯酰胺凝胶为例 ,研究了聚合物凝胶结构的非均匀性及交联度对凝胶结构的影响。研究结果表明 ,聚合物凝胶具有明显的非均匀性 ,且随交联度的增... 提出了一种利用同一角度静态光散射测量来研究透明聚合物凝胶结构非均匀性的新方法 ,并以聚丙烯酰胺凝胶为例 ,研究了聚合物凝胶结构的非均匀性及交联度对凝胶结构的影响。研究结果表明 ,聚合物凝胶具有明显的非均匀性 ,且随交联度的增大 ,其结构的非均匀性聚随之增强。 展开更多
关键词 凝胶 非均匀性 静态光散射 高聚物 聚丙烯酰胺
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