نتایج جستجو برای: random wave

تعداد نتایج: 497113  

Journal: :Multiscale Modeling & Simulation 2015
Ricardo Alonso Liliana Borcea

Abstract. We study long range propagation of electromagnetic waves in random waveguides with rectangular cross-section and perfectly conducting boundaries. The waveguide is filled with an isotropic linear dielectric material, with randomly fluctuating electric permittivity. The fluctuations are weak, but they cause significant cumulative scattering over long distances of propagation of the wave...

2001
Dmitri A. Ivanov

In disordered vortices in p-wave superconductors the two new random-matrix ensembles may be realized: B and DIII-odd (of so(2N + 1) and so(4N + 2)/u(2N + 1) matrices respectively). We predict these ensembles from an explicit analysis of the symmetries of Bogoliubov– deGennes equations in three examples of vortices with different p-wave order parameters. A characteristic feature of the novel sym...

Journal: :Physical review letters 2011
Denys Dutykh Céline Labart Dimitrios Mitsotakis

The estimation of the maximum wave run-up height is a problem of practical importance. Most of the analytical and numerical studies are limited to a constant slope plain shore and to the classical nonlinear shallow water equations. However, in nature the shore is characterized by some roughness. In order to take into account the effects of the bottom rugosity, various ad hoc friction terms are ...

2015
D V. Churkin I V. Kolokolov E V. Podivilov I D. Vatnik M A. Nikulin S S. Vergeles I S. Terekhov V V. Lebedev G. Falkovich S A. Babin S K. Turitsyn

Traditional wave kinetics describes the slow evolution of systems with many degrees of freedom to equilibrium via numerous weak non-linear interactions and fails for very important class of dissipative (active) optical systems with cyclic gain and losses, such as lasers with non-linear intracavity dynamics. Here we introduce a conceptually new class of cyclic wave systems, characterized by non-...

Journal: :Optics letters 2015
Tan H Nguyen Hassaan Majeed Gabriel Popescu

We investigate the uniqueness of the plane-wave decomposition of temporally deterministic, spatially random fields. Specifically, we consider the decomposition of spatially ergodic and, thus, statistically homogeneous fields. We show that when the spatial power spectrum is injective, the plane waves are the only possible coherent modes. Furthermore, the randomness of such fields originates in t...

1997
Akira Ishimaru

No wonder you activities are, reading will be always needed. It is not only to fulfil the duties that you need to finish in deadline time. Reading will encourage your mind and thoughts. Of course, reading will greatly develop your experiences about everything. Reading wave propagation and scattering in random media is also a way as one of the collective books that gives many advantages. The adv...

2000
Guillaume Bal Valentin Freilikher

We study transport and di usion of classical waves in two-dimensional disordered systems and in particular surface waves on a at surface with randomly uctuating impedance. We derive from rst principles a radiative transport equation for the angularly resolved energy density of the surface waves. This equation accounts for multiple scattering of surface waves as well as for their decay because o...

2016
ROBERT A. SCHMELTZER

Wave propagation in a random continuous medium is studied by solving the stochastic wave equation with a random function for the refractive index coefficient. By the application of the Rytov transformation, an equivalent spatial form of the nonlinear Riccati equation is obtained which is then solved by means of an iteration scheme. The statistical properties of the propagated wave are then comp...

Journal: :Physical review letters 2004
Kees Wapenaar

A correlation-type reciprocity theorem is used to show that the elastodynamic Green's function of any inhomogeneous medium (random or deterministic) can be retrieved from the cross correlation of two recordings of a wave field at different receiver locations at the free surface. Unlike in other derivations, which apply to diffuse wave fields in random media or irregular finite bodies, no assump...

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