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WAVE PROPAGATION WITH MASS-COUPLING EFFECT IN FLUID-SATURATED POROUS MEDIA 被引量:1
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作者 李向维 李向约 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第4期321-327,共7页
This article utilizes the theory of mixtures to formulate a general theory of wave propagation with mass-coupling effect in fluid-saturated porous media. An attempt is made to discuss the physical interpretation and t... This article utilizes the theory of mixtures to formulate a general theory of wave propagation with mass-coupling effect in fluid-saturated porous media. An attempt is made to discuss the physical interpretation and the thermodynamic restriction of the coefficients appearing in the equations obtained, by the comparison it is shown that Biot's classical theory and the present one are essentially consistent. Also wave velocities in some special cases are calculated, from which it is concluded that mass-coupling and permeability of media greatly affect wave propagation behavior. 展开更多
关键词 WAVE propagation WITH MASS-COUPLING EFFECT IN FLUID-SATURATED POROUS media
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Coupled-generalized nonlinear Schr¨odinger equations solved by adaptive step-size methods in interaction picture
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作者 陈磊 李磐 +3 位作者 刘河山 余锦 柯常军 罗子人 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第2期332-340,共9页
We extend two adaptive step-size methods for solving two-dimensional or multi-dimensional generalized nonlinear Schr ¨odinger equation(GNLSE): one is the conservation quantity error adaptive step-control method(R... We extend two adaptive step-size methods for solving two-dimensional or multi-dimensional generalized nonlinear Schr ¨odinger equation(GNLSE): one is the conservation quantity error adaptive step-control method(RK4IP-CQE), and the other is the local error adaptive step-control method(RK4IP-LEM). The methods are developed in the vector form of fourthorder Runge–Kutta iterative scheme in the interaction picture by converting a vector equation in frequency domain. By simulating the supercontinuum generated from the high birefringence photonic crystal fiber, the calculation accuracies and the efficiencies of the two adaptive step-size methods are discussed. The simulation results show that the two methods have the same global average error, while RK4IP-LEM spends more time than RK4IP-CQE. The decrease of huge calculation time is due to the differences in the convergences of the relative photon number error and the approximated local error between these two adaptive step-size algorithms. 展开更多
关键词 nonlinear optics optical propagation in nonlinear media coupled-generalized nonlinear Schr?dinger equations(C-GNLSE) adaptive step-size methods
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Propagation of elastic plane waves in homogeneous and transversely isotropic media 被引量:2
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作者 WANG Xiaomin LI Mingxuan(Institute of Acoustics, Acadetnia Sinica Beijing 100080) 《Chinese Journal of Acoustics》 1998年第3期280-288,共9页
Solutions to the equation of waves motion are derived for homogeneous and transversely isotropic media such as fiber-reinforced composites, and three dimensional slowness surfaces are shown as well. A brief discussion... Solutions to the equation of waves motion are derived for homogeneous and transversely isotropic media such as fiber-reinforced composites, and three dimensional slowness surfaces are shown as well. A brief discussion on the propagation of plane waves is given.Elastic plane waves are characterized by slowness vectors, wave vectors, polarization vectors and group velocity vectors, etc. The results obtained are presented in a coordinate-free form due to the introduction of the crystal axis' orieniation vector which specifies the anisotropy of the media. Therefore, the results are the most general and convenient for further application 展开更多
关键词 GENE propagation of elastic plane waves in homogeneous and transversely isotropic media ROSE
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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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A sweeping preconditioner for Yee's finite difference approximation of time-harmonic Maxwell's equations
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作者 Paul TSUJI Lexing YING 《Frontiers of Mathematics in China》 SCIE CSCD 2012年第2期347-363,共17页
This paper is concerned with the fast iterative solution of linear systems arising from finite difference discretizations in electromagnetics. The sweeping preconditioner with moving perfectly matched layers previousl... This paper is concerned with the fast iterative solution of linear systems arising from finite difference discretizations in electromagnetics. The sweeping preconditioner with moving perfectly matched layers previously developed for the Helmholtz equation is adapted for the popular Yee grid scheme for wave propagation in inhomogeneous, anisotropic media. Preliminary numerical results are presented for typical examples. 展开更多
关键词 Electromagnetic scattering Yee grid finite difference methods perfectly matched layers LDLT factorizations multifrontal method wave propagation in inhomogeneous and anisotropic media matrix preconditioners
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