Results 71 to 80 of about 1,885,669 (194)

On large deviation regimes for random media models

, 2009
The focus of this article is on the different behavior of large deviations of random subadditive functionals above the mean versus large deviations below the mean in two random media models.
Cranston, M., Gauthier, D., Mountford, T. S.   +2 more
core   +2 more sources

Fluctuations in a diffusive medium with gain

, 2013
We present a stochastic model for amplifying, diffusive media like, for instance, random lasers. Starting from a simple random-walk model, we derive a stochastic partial differential equation for the energy field with contains a multiplicative random ...
J. García-Ojalvo, P. Sheng, S. Prahl, Stefano Lepri, V. M. Markushev, V. S. Letokhov   +5 more
core   +1 more source

Lensless imaging based on coherent backscattering in random media

AIP Advances, 2014
We studied lensless imaging due to coherent backscattering in random media both theoretically and experimentally. The point spread function of the lensless imaging system was derived.
Lei Xu, Hao Yang, Peilong Hong, Fang Bo, Jingjun Xu, Guoquan Zhang   +5 more
doaj   +1 more source

Freezing of dynamical exponents in low dimensional random media

, 2000
A particle in a random potential with logarithmic correlations in dimensions $d=1,2$ is shown to undergo a dynamical transition at $T_{dyn}>0$. In $d=1$ exact results demonstrate that $T_{dyn}=T_c$, the static glass transition temperature, and that the ...
A. Cavagna, A. Stern, B. Derrida, B. Derrida, C. Chamon, D. A. Gorokhov, D. Carpentier, D. Carpentier, D. S. Fisher, F. I. B. Williams, G. Blatter, H. Castillo, Horacio E. Castillo, J. Honkonen, J. P. Bouchaud, L. H. Tang, L. Laloux, M. Cha, P. Le Doussal, P. Le Doussal, Pierre Le Doussal, S. Alexander, S. E. Derkachov, S. E. Korshunov, S. Scheidl, T. Nattermann, V. E. Kravtsov, V. Pham   +27 more
core   +1 more source

Imaging through random media [PDF]

The Journal of the Acoustical Society of America, 1988
The distorting effects of random media on imaging are discussed. Random phase and random intensity fluctuations will be treated and the importance of isoplanicity will be emphasized. Methods of processing to overcome the distortion in conventional imaging will be considered, and the advantages of speckle interferometry and intensity interferometry will
openaire   +1 more source

The average transmitted wave in random particulate materials

New Journal of Physics
Microwave remote sensing is significantly altered when passing through clouds or dense ice. This phenomenon is not unique to microwaves; for instance, ultrasound is also disrupted when traversing through heterogeneous tissues.
Aristeidis Karnezis, Paulo S Piva, Art L Gower   +2 more
doaj   +1 more source

Are waves all localized in two dimensional random media?

, 2002
It has been the dominant view for over two decades that all waves are localized in two dimensions for any given amount of disorder. Here, I would like to raise questions about this assertion. The discussion leads to the conclusion that there is a lack of
Abrahams, Abrahams, Anderson, Asatryan, Barenbatt, Bayindir, Bikash C. Gupta, Cao, Chabanov, Chen, Condat, Condat, Dalichaouch, Deych, Foldy, Gupta, Gupta, Hennino, Hoskinson, John, Lagendijk, Lax, Lee, Luan, March, Pudalov, Ramakrishnan, Robertson, Shashkin, Shashkin, Sheng, Sigalas, Soukoulis, Tarasov, Tarasov, Thouless, Twersky, van Albada, van Rossum, van Tiggelen, Vollhardt, Weaver, Wiersma, Wolf, Ye, Ye, Ye, Zhang, Zhen Ye   +48 more
core   +1 more source

Geometric Models for Isotropic Random Porous Media: A Review

Advances in Materials Science and Engineering, 2014
Models for random porous media are considered. The models are isotropic both from the local and the macroscopic point of view; that is, the pores have spherical shape or their surface shows piecewise spherical curvature, and there is no macroscopic ...
Helmut Hermann, Antje Elsner
doaj   +1 more source

Random Laser Action in Dye-Doped Polymer Media with Inhomogeneously Distributed Particles and Gain

Applied Sciences, 2019
The properties of random lasing are investigated for bubble-structure (BS) dye-doped polymer random media in which non-scattering and no-gain regions are distributed.
Takashi Okamoto, Masaki Mori
doaj   +1 more source

Analysis of self--averaging properties in the transport of particles through random media

, 1994
We investigate self-averaging properties in the transport of particles through random media. We show rigorously that in the subdiffusive anomalous regime transport coefficients are not self--averaging quantities.
B. Derrida, C. Aslangul, C. Aslangul, E. Eisenberg, E. Hernández-García, G. H. Weiss, J. M. López, J. P. Bouchaud, J. W. Haus, K. Binder, L. Pesquera, M. A. Rodríguez, M. A. Rodríguez, S. Alexander, S. H. Noskowicz, S. H. Noskowicz   +15 more
core   +1 more source