Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 42 for “"random media"”.
-
Superfluidity and random media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1993.
-
Opportunistic Random Media Access in WLANs
… medium access. The protocol changes the media access opportunities of nodes by adjusting the contention window dynamically according to the different bit rates. Thereby, the protocol can reduce collision and improve throughput significantly. The n·aditional IEEE 802.11 standards access …
-
Probing Random Media With Singular Waves
… the light propagation in highly inhomogeneous media and the relationship to angular momentum transfer. Angular momentum carried by light can be, in many cases, divided in two terms. The first one relates to the polarization of light and can be associated, in the quantum description, to the spin …
-
Propagation of acceleration waves in random media
The paper studies the effects of material spatial randomness on the evolution of acceleration waves. The deterministic analysis of acceleration waves assumes perfectly homogeneous materials and has led to the derivation of the following Bernoulli equation [13], which models the time evolution of …
-
Standard and Anomalous Wave Transport Inside Random Media
… thesis is a study of wave transport inside random media using random matrix theory. Anderson localization plays a central role in wave transport in random media. As a consequence of destructive interference in multiple scattering, the wave function decays exponentially inside random systems. …
-
A Numerical Study of Rays in Random Media
Made available in DSpace on 2014-12-10T19:06:40Z (GMT). No. of bitstreams: 1 7115010.pdf: 3589240 bytes, checksum: d1382e4a2dd821dd2d7d86bb2f0233d8 (MD5) Previous issue date: 1970
-
Probabilistic analysis of the plastic collapse of random media
… plastic continuous medium exhibiting randomly varying yield strength. Both the Tresca and Mohr-Coulomb yield criteria are considered in the present study. The two probabilistic methods developed are based on the upper and lower bound theorems of plastic limit analysis. By extending …
-
Review of random media homogenization using effective medium theories
… to a particular problem. Homogenization of the random media using effective medium theories yields the effective propagation constants by effacing the particulate, microscopic nature of the medium. The Maxwell-Gamet and Bruggeman effective medium theories are widely used but their limitations …
-
Numerical simulation of optical wave propagation through random media
… simulation. For instantaneous realization of a random medium, a simplified version of the random-motion model [77] is used, and for wave-propagation calculation the wave-kinetic numerical method and/or the angular-spectral representation of the Huygens-Fresnel diffraction formula are used. For …
-
Theoretical studies for microwave remote sensing of layered random media
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1980.
-
Homogenization of Random Media: Random Walks, Diffusions and Stochastic Interface Models
… scaling limits and heat kernel estimates, for random processes moving in random environments and for stochastic interface models. The first chapter will survey recent research and introduce three models of interest: the random conductance model, the Ginzburg-Landau ∇φ model, and the symmetric …
-
Direct and inverse scattering models for random media and rough sufraces
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
-
Electromagnetic wave scattering by discrete random media with remote sensing applications
… of electromagnetic waves in medium with randomly distributed discrete scatterers is studied. Analytical and numerical solutions to several problems with implications for the active and passive remote sensing of the Earth environment are obtained. The quasi-magnetostatic (QMS) solution for …
-
Elastic Propagation in random media: applications to the imaging of volcano structures
… seismograms contain features that reflect the random inhomogeneities of the earth. In this work I use an imaging method to locate the high contrast small- scale heterogeneity respect to the background earth medium. This method was first introduced by Nishigami (1991) and than applied to …
-
An Investigation of the Multiple Scattering of Waves in Two-Dimensional Random Media
… average, or coherent, wave in a two-dimensional random medium have been undertaken for the steady-state and transient cases. The medium consisted of a tensioned mesh with a uniform distribution of point masses attached at the intersection points of the mesh. For the steady-state case, a random …
-
Optical polarization control in free space and through random media using wavefront shaping
… of light transmitted through highly scattering media. In this regard, we introduce the concept of the vector transmission matrix (VTM) by generalizing the conventional transmission matrix. We develop a novel technique to measure the absolute value of VTM elements and show that the randomness of …
-
Microwave scattering and synthetic aperture radar imaging of targets buried in random media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
-
Finite-difference time-domain simulation of electromagnetic scattering from objects under random media
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
-
A parallel Monte-Carlo partial-differential-equation procedure for the analysis of multicomponent random media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
Page 1 of 3