Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Mark J. Beran"'
Publikováno v:
Waves in Random and Complex Media. 18:435-460
In Ref. [1] (Appendix A) we derived equations governing the frequency and spatial spectrum of radiation propagating in three-dimensional time-dependent random media with randomly varying sound speed c ( x , t). From the spectral equations we determin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fee2d108466978dd08aaa62a8c3dfb97
https://doi.org/10.1080/17455030802078429
https://doi.org/10.1080/17455030802078429
Autor:
Shimshon Frankenthal, Mark J. Beran
Publikováno v:
Waves in Random and Complex Media. 17:189-212
We calculate the probability density distributions of the power reflection coefficient, and of the various fluxes of the components of an erstwhile plane wave that propagates in a one-dimensionally stratified slab of a time-independent scattering med
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1bdde50a6fd3e6cd6d57858bca6c2d6
https://doi.org/10.1080/17455030601121586
https://doi.org/10.1080/17455030601121586
Autor:
Shimshon Frankenthal, Mark J. Beran
Publikováno v:
Waves in Random and Complex Media. 16:231-259
We consider backscattering of stationary radiation in a random medium whose wavespeed fluctuations depend on time and on space. We modify a previous derivation of the equations that govern the range-evolution of the spectra of the ensemble-averaged f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f79592fdff5401b2cd0c5d6fba3998aa
https://doi.org/10.1080/17455030600710983
https://doi.org/10.1080/17455030600710983
Autor:
Mark J. Beran, Shimshon Frankenthal
Publikováno v:
Waves in Random Media. 13:241-268
We consider backscattering in a random stratified medium where the wave-speed fluctuations depend on time and on the range coordinate, which is normal to the planes of stratification. For the limit where the correlation time is shorter than the mean
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6eb4451d018fc8e3c29036b1c0091165
https://doi.org/10.1088/0959-7174/13/4/303
https://doi.org/10.1088/0959-7174/13/4/303
Publikováno v:
Waves in Random Media. 13:269-286
In this paper we first derive the equations governing the energy fluxes propagating in each of the modes of a duct. In each mode there is a forward and backward component and the equations are intended to treat ducts in which backscattering plays a m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4fdcdd17e39f54ba1f872623cbfcb5b5
https://doi.org/10.1088/0959-7174/13/4/304
https://doi.org/10.1088/0959-7174/13/4/304
Autor:
Alan M. Whitman, Mark J. Beran
Publikováno v:
Waves in Random Media. 10:231-251
In a previous paper (Whitman et al 1999 Waves Random Media 9 1–11) we discussed the scattering of acoustic waves by random sound-speed fluctuations in a two-dimensional channel and presented an asymptotic form for an acoustic pulse propagating in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33bbdf41c9d3b189ceea8bb32ab8c3fb
https://doi.org/10.1080/13616670009409772
https://doi.org/10.1080/13616670009409772
Publikováno v:
Waves in Random Media. 9:1-11
When acoustic waves are scattered by random sound-speed fluctuations in a two-dimensional channel the energy is continually transferred between the propagating modes. In the multiple- scattering region the energy flux assumes an asymptotic form in wh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65e7791143cc141d88abb384b4208e1e
https://doi.org/10.1088/0959-7174/9/1/001
https://doi.org/10.1088/0959-7174/9/1/001
Autor:
Mark J. Beran, Shimshon Frankenthal
Publikováno v:
The Journal of the Acoustical Society of America. 104:3282-3295
The statistics of a forward-propagating wave is considered in a random, anisotropic, stratified three-dimensional waveguide, where modal analysis offers unique advantages. After extracting the vertical dependence in the usual way, the equations are f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4092472e32fb197be4e1600063af1fbf
https://doi.org/10.1121/1.423968
https://doi.org/10.1121/1.423968
Autor:
Shimshon Frankenthal, Mark J. Beran
Publikováno v:
Waves in Random Media. 7:257-282
We consider the statistics of the transverse spectra of forward-propagating waves in a stationary random medium. A short-range perturbation solution is used to derive the difference equations that govern the long-range evolution of the ensemble-avera
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e7d4c370a30c763390fbcbea481bc62
https://doi.org/10.1088/0959-7174/7/2/007
https://doi.org/10.1088/0959-7174/7/2/007
Autor:
Mark J. Beran, Shimshon Frankenthal
Publikováno v:
The Journal of the Acoustical Society of America. 100:1463-1472
In previous work, a modal approach was used to study random volume scattering in a shallow channel [M. J. Beran and S. Frankenthal, J. Acoust. Soc. Am. 91, 3203–3211 (1992)]. Here, it is shown how to include the effects of a rough channel surface i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8b1525f2226ea337de7638ad095abda
https://doi.org/10.1121/1.415993
https://doi.org/10.1121/1.415993