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.
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Showing 1 to 20 of 37 for “"Inhomogeneous Media"”.
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Sound Propagation in Inhomogeneous Media
… Biot theory of wave propagation in poro-elastic media is reviewed and contrasted with a recent theory advanced by de la Cruz and Spanos, particularly in respect of boundary conditions; - the influence of porosity on wave propagation in fluid-saturated porous elastic media is investigated using …
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Propagation of molecular outflows into inhomogeneous media
Molecular clouds have inhomogeneous density profiles and have been observed to be `clumpy' in nature, containing dense cores, rarefied filaments and cocoons. Energetic mass-ejection phenomena created during the gravitational collapse of dense cores are thought to be responsible for the molecular …
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Elastic wave scattering in laterally inhomogeneous media
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 1991
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Multiple Scattering Of Light In Inhomogeneous Media And Applications
… being developed for non-invasive diagnostics of inhomogeneous media in various fields, such as medicine, biology, and material characterization. However, as most media of interest are highly scattering and have a complex structure, it is difficult to obtain a full analytical solution of the …
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Propagation of electromagnetic waves in spatially dispersive inhomogeneous media
Spatial dispersion is the effect where media respond not only to a signal at one particular point, but to signals in an area around that point. While temporal dispersion is a well studied topic, spatial dispersion is relatively unexplored. This thesis investigates the behaviour of electromagnetic …
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Reflection and transmission coefficients in multi-wave inhomogeneous media.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1970. Ph.D.
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An investigation of the perfectly matched layer for inhomogeneous media
Although perfectly matched layers (PMLs) have been widely used to truncate numerical simulations of electromagnetism and other wave equations, we point out important cases in which a PML fails to be reflectionless even in the limit of infinite resolution. In particular, the underlying …
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Immersed Discontinuous Galerkin Methods for Acoustic Wave Propagation in Inhomogeneous Media
… acoustic wave propagation problems in inhomogeneous media where elements are allowed to be cut by the material interface. The proposed methods use the standard discontinuous Galerkin finite element formulation with polynomial approximation on elements that contain one fluid while on …
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Theoretical and numerical studies of wave propagation and scattering in inhomogeneous media
… Green's function for the background inhomogeneous medium with the linear refractive index profile is obtained. The technique is extended to treat the three-dimensional and range-dependent media with or without turning points. Two analytical expressions of the Green's functions are …
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A numerical study of the effects of inhomogeneous media in diffusion weighted imaging
… we investigate the changes in the ADC in an inhomogeneous model by including higher order moments of the DPDF and we discuss the possible advantages of these alternative definitions.
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Propagation Effect In Inhomogeneous Media, Including Media With Light-induced And Fixed Gratings
… in the approximation of constant impedance media. As examples, this equation successfully describes a) Fresnel transmission coefficient, and b) Goose-Hanschen shift in total internal reflection, for depolarized incident light and, at the same time, polarization-insensitive detectors. …
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Scattering of SH wave by surface depression or convex in density inhomogeneous media
L'abstract è presente nell'allegato / the abstract is in the attachment
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Irreversible thermodynamic effects in inhomogeneous media and their applications in certain geoelectric problems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963.
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Hybrid Galerkin boundary element-wavenumber integration method for acoustic propagation in laterally inhomogeneous media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1991.
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A study of the propagation of a acoustic waves and instabilities in inhomogeneous media
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1963
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Stability Analysis of Krylov Subspace Spectral Methods for the 1-D Wave Equation in Inhomogeneous Media
… KSS method applied to the wave equation in inhomogeneous media.</p>
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On the boundary integral equation method for the solution of some problems for inhomogeneous media / Mohammad Ivan Azis.
… kinds of engineering problems associated with inhomogeneous materials or media: a class of elliptical boundary value problems (BVPs), the boundary value problem of static linear elasticity, and the calculation of the solution of the initial-boundary value problem of non-linear heat conduction …
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Drift-diffusion of a vacancy in inhomogeneous media and its material constants : a Fokker-Planck equation approach with an application to foreign exchange data
… equation describing a vacancy hopping in inhomogeneous media in one dimension under a directed stress. The study used the general master equation as a basis for a physical model because of the mesoscopic view that the change in average concentration is inadequate to describe small …
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Coherence Properties Of Optical Near-fields
… fields in the vicinity of optically inhomogeneous media which emit or scatter radiation. The properties of such fields are being characterized within the frame of the coherence theory. While successful in describing the far-field properties of optical fields, the fundamental results …
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Numerical green's function in surface integral equation method and hydrodynamic model for solar cell analysis
… the surface integral equation (SIE) method for inhomogeneous media have been addressed, including the process of solving for the NGF from differential equation, the integrating of NGF with SIE, the NGF based augmented-electric field integral equation (A-EFIE) for low-frequency problems and the …
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