Reflection and Refraction of Plane Waves at an Interface of Mirror-Conjugate Chiral Media

We consider reflection and refraction of plane electromagnetic waves by a plane interface of mirror-conjugate isotropic chiral media for differently assigned incident fields. Relationships between the reflection or refraction coefficients, the common angle of incidence, and the physical parameters of the interfacing media are adduced and discussed. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 48, No. 6, pp. 537–543, June 2005     

Plane Waves Propagating in Gases Composed of Composite Particles

The quantum discrete kinetic equations are solved to study the propagation of plane waves in a system of composite particles with hard-sphere interactions and the filling factor (ν) being 1/2. We compare the dispersion relations thus obtained by the relevant Pauli-blocking parameter B which describes the different-statistics particles for the quantum analog of the discrete Boltzmann system when B is positive (Bose gases), zero (Boltzmann gases), and negative (Fermi Gases). We found, as the effective magnetic field being zero (ν = 1/2 using the composite fermion formulation), the electric field effect will induce anomalous dispersion relations.     

Stable Propagating Waves and Wake Fields in Relativistic Electromagnetic Plasma

Stable propagating waves and wake fields in relativistic electromagnetic plasma are investigated. The incident electromagnetic field has a finite initial constant amplitude meanwhile the longitudinal momentum of electrons is taken into account in the problem. It is found that in the moving frame with transverse wave group velocity the stable propagating transverse electromagnetic waves and longitudinal plasma wake fields can exist in the appropriate regime of plasma.     

Obliquely Propagating Electron Acoustic Shock Waves in Magnetized Plasma

Obliquely propagating electron acoustic shock waves in plasma with stationary ions, cold and superthermal hot electrons are investigated in magnetized plasma. Employing reductive perturbation method, Korteweg-de Vries-Burgers equation (KdVB) is derived in the small amplitude approximation limit. The analytical and numerical calculations of the KdVB equation show the variation of shock waves structure (amplitude, velocity, and width) with different plasma parameters. Particle density (α), superthermal parameter (κ), electron temperature ratio (??), kinetic viscosity (η₀), obliqueness (k_z), and strength of magnetic field (ω_c) significantly modify the properties of the shock waves structures. The present investigation is useful to understand dissipative structures observed in space or laboratory plasma where multielectrons population with superthermal electrons are prevalent.     

Waves in the Faraday Chiral Media. II. Surface Waves

The propagation of surface waves directed by a plane boundary of the half-space of the Faraday chiral medium (chiroplasma or chiroferrite) is studied in the Voigt configuration. The frequency dependences of the wave parameters are investigated. Conditions of critical propagation regimes are determined.     

Waves in the Faraday Chiral Media. I. Bulk Waves

The propagation of bulk plane waves in the Faraday chiral media (chiroplasma and chiroferrite) at an arbitrary angle to the direction of a constant magnetic field is examined. The frequency dependences of the wave parameters are studied. The conditions of critical propagation regimes are established.     

Linear Analysis of Obliquely Propagating Longitudinal Waves in Partially Spin Polarized Degenerate Magnetized Plasma

Linear analysis of low frequency obliquely propagating electrostatic waves in a partially spin polarized degenerate magnetized plasma is presented. Using Fourier analysis, a general linear dispersion relation is derived for low frequency electrostatic lower hybrid(LH) wave, ion acoustic(IA) wave and ion cyclotron(IC) wave in the presence of electron spin polarization. It is found that the electron spin polarization gives birth to a new spin-dependent wave(spin electron acoustic wave) in the spectrum of these waves. Further, the electron spin polarization also causes drastic shifts in the frequency spectrum of these waves. These effects would have a strong bearing on wave phenomena in degenerate astrophysical plasmas.     

Reflection and Refraction of Harmonic Plane Acoustic Waves by a Plane Interface of Media with Arbitrary Acoustic Properties

Radiophysics and Quantum Electronics - We propose universal formulas for the amplitudes of longitudinal and transverse plane acoustic waves, which are reflected and refracted by a plane interface...     

On the Possibility of Reflectionless Propagation of Plane Acoustic Waves in Continuously Stratified Media

Acoustical Physics - The example of vertical propagation of acoustic plane waves in the atmosphere is used to establish that the reflectionless propagation of acoustic waves occurs only in...     

Evanescent Plane Waves in Multilayer Structures

We have considered evanescent plane waves in structures with a layer of a substance with ε, μ < 0 and with a layer of a well-reflecting metal, ε < 0, μ ≥ 1. Waves with increased amplitude as compared with the initial wave have been found to occur, due to which evanescent waves with wave number as in the initial wave but with increased amplitude arise behind these layers. A composite material with ε, μ < 0 at optical frequencies are proposed. Surface waves on a metal layer are considered in detail. It is shown that surface waves with a sufficiently arbitrary wave number can be excited. It is also shown that, on very thin layers, surface waves with wave number exceeding ten times that of a homogeneous plane wave in vacuum can be excited. Propagation losses are calculated. For a silver layer, the wave path can be from 30 up to 100 wavelengths. Practical use in developing techniques for optical transformations of short-wave surface waves in 2D space, similar to those in 3D space, are pointed out.     

格子Boltzmann方法应用于气动声学研究

应用格子Boltzmann方法(LBM)对不同类型的气动声学问题进行数值研究.通过模拟一维平面声波和二维点源声波的传播,得到沿传播方向的声压脉动,其振荡幅值和衰减趋势与理论值相吻合.其次进行声波衍射和干涉现象的数值模拟.最后,模拟处于流场中运动声源辐射声场的多普勒效应.模拟结果说明LBM方法能较好地模拟低马赫数下的声学问题,包括声压脉动的传播,声波的波动特性以及流动与声波间的相互作用.     

Two-Flux Colliding Plane Waves in String Theory

We construct the two-flux colliding plane wave solutions in higher-dimensional gravity theory with dilaton, and two complementary fluxes. Two kinds of solutions have been obtained： Bell-Szekeres （BS） type and homogeneous type. After imposing the junction condition, we find that only the BS type solution is physically well-defined. Furthermore, we show that the future curvature singularity is always developed for our solutions.     

Two-Flux Colliding Plane Waves in String Theory

We construct the two-flux colliding plane wave solutions in higher-dimensional gravity theory with dilaton,and two complementary fluxes. Two kinds of solutions have been obtained: Bell-Szekeres (BS) type and homogeneous type. After imposing the junction condition, we find that only the BS type solution is physically well-defined. Furthermore, we show that the future curvature singularity is always developed for our solutions.     

Erratum to: On the Possibility of Reflectionless Propagation of Plane Acoustic Waves in Continuously Stratified Media

Acoustical Physics - An Erratum to this paper has been published: https://doi.org/10.1134/S1063771022340024     

Beam Loading in Plasma Waves

Certain key accelerator issues relevant to plasma-based accelerators are studied in this article. Analytic results for important quantities of interest, such as maximum beam current, efficiency, and energy spread will be given. These results will then be compared with one-and two-dimensional particle-in-cell (PIC) computer simulations. Special emphasis will be placed on those schemes that offer not only high accelerating gradients, but also high efficiency and small energy spread.     

Quality Factor of Inhomogeneous Plane Waves

Acoustical Physics - We first compare two apparently dissimilar expressions for the quality factor Q of inhomogeneous plane waves in isotropic viscoelastic media, where Q is defined as the result...     

Relativistic Spherical Plasma Waves in a Collisional and Warm Plasma

Under Lagrange coordinates, the relativistic spherical plasma wave in a collisional and warm plasma is discussed theoretically. Within the Lagrange coordinates and using the Maxwell and hydrodynamics equations, a wave equation describing the relativistic spherical wave is derived. The damped oscillating spherical wave solution is obtained analytically using the perturbation theory. Because of the coupled effects of spherical geometry,thermal pressure, and collision effect, the electron damps the periodic oscillation. The oscillation frequency and the damping rate of the wave are related to not only the collision and thermal pressure effect but also the space coordinate. Near the center of the sphere, the thermal pressure significantly reduces the oscillation period and the damping rate of the wave, while the collision effect can strongly influence the damping rate. Far away from the spherical center, only the collision effect can reduce the oscillation period of the wave, while the collision effect and thermal pressure have weak influence on the damping rate.     

The Coupling of Magnetoacoustic Waves Propagating Along the Direction of Stratification of a Viscous Plasma Situated in a Variable Magnetic Field

The components of the coupling matrix were evaluated, corresponding to the coupling of magnetoacoustic waves in a non-ideal plasma for the physical situation modelling the terrestrial ionosphere.     

流体饱和多孔介质中的声波

流体饱和多孔介质（以下简写为FSPM）中的声波研究，既属于声学范围，又属于地球物理学范围，无论从原理上和应用上都值得深入研究．本文对流行的BIOt理论以及它的发展和应用做一个简要介绍，包括Blot理论和三种体波，声波在FSPM和流体及固体界面上的反射、折射问题，FSPM样品的参数约声学测量以及并中渗透率的声学测量问题。在附录中介绍了流体和框架间的粘性相互作用项和惯性相互作用项，因为在B沁t理论的发展中，这两项是经常讨论的问题。