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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 42 for “"layered media"”.
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Stability of one-dimensional waves in layered media
… of a result on the stability of waves in layered media with respect to Webster's horn equation and travel-time velocity as a parameter The stability property of waves is related to the forward map. It is known that the forward map as a function of the vertical wave velocity is not locally …
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Forced vibrations of circular foundations on layered media.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1974. Sc.D.
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Geometrical formulation and traveltime computation in heterogeneous layered media
This thesis deals with the subject of seismic traveltime computation. The velocity field is represented by an arbitrary distribution of rectangular or square cells. The cells with an interface crossed are represented by two non-rectangular cells. Each cell is assigned a constant velocity. A …
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Frequency-scale effect in elastic periodic muti-layered media
… by the solution of the wave equation for elastic media. This solution allows the definition of Brillouin zones whose width is equal to pi/d and shows that the periodic medium exhibits a range of stop-bands frequencies where the wave does not propagate. These stop-bands are located at the boundary …
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Modeling of acoustic-emission wave propagation in layered media
… for acoustic-emission (AE) wave propagation in a layered medium, which can be used for damage detection in structural health monitoring in general, and crack identification in non-destructive testing and evaluation for materials in particular. In the model, the materials are characterized by …
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Radiation and scattering of electromagnetic waves in layered media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Seismic wave propagation in thinly-layered media with steep reflectors
Includes bibliographical references.
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The nonlinear differential semblance algorithm for plane waves in layered media
… output least-squares (OLS) seismic inversion for layered-media. The latter cannot guarantee a reliable solution for either synthetic or field data, because of the existence of many spurious local minima of the objective function for typical data, which lack low-frequency energy. To recover the …
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Elements for the numerical analysis of wave motion in layered media
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1981.
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Dynamic stiffness functions of strip and rectangular footings on layered media.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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Three-dimensional layerwise modeling of layered media with boundary integral equations
… for the analysis of layers, plates, and multi-layered systems consisting of isotropic and linear elastic materials. The problem is formulated for the general case of a multi-layered system using a total potential energy formulation and employing the layerwise laminate theory of Reddy. A …
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Fast Large-Scale Electromagnetic Simulation of Doubly Periodic Structures in Layered Media
… of doubly periodic structures embedded in layered media, which can be commonly found in extreme ultraviolet (EUV) lithography, metasurfaces, and frequency selective surfaces. Such problems can be solved by rigorous numerical methods like finite-difference time-domain (FDTD) method and …
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Multilevel Multipole -Free Fast Algorithm for Electromagnetic Scattering Problems in Layered Media
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Numerical Analysis of Axi-Symmetric Wave Propagation in Elastic-Plastic Layered Media
Made available in DSpace on 2014-12-08T23:57:11Z (GMT). No. of bitstreams: 1 6901434.pdf: 3488969 bytes, checksum: d37f97a4e97cfc6bb9e378a16cbfc255 (MD5) Previous issue date: 1968
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Electrodynamic Green's Functions in Layered Media: Accurate Closed -Form Approximations for Both Electric and Magnetic Sources
… Green's function in the presence of planar media composed of layers of arbitrary material composition and thickness. Special emphasis was placed on making the computer tool robust to ensure the accuracy of the calculated Green's function over a very broad range of frequencies, thus making it …
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Characteristic Mode Analysis of Crumpled Graphene Flakes and A New Green’s Functions Evaluation Method for Layered Media
… to TE and TM modes of a single dielectric layered medium backed by a ground plane. Finally, the RF coupling experiments to PCB were debugged, analyzed and explained using CMA. The analysis has shown a match in coupling frequency between measurement and simulation and has shown hotspots on …
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Integral Equation Methodologies for the Signal Integrity Analysis of PCB and Interconnect Structures in Layered Media From DC to Multi-Ghz Frequencies
… of electrodynamic Green's functions for lossy layered media, as well as the efficient modeling of the skin effect loss inside the metalization. The aforementioned difficulties are addressed effectively in this thesis through the following contributions. A fast iterative solver based on the …
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Efficient integral equation solution of electromagnetic scattering by arbitrarily shaped objects in planar, multilayered media
… scattering by objects located in planar, multilayered media has long been the subject of active research. For layered-media integral equation solutions via the Method of Moments (MoM), the O($N\sp2$) matrix fill is often prohibitively expensive, even for problems of moderate size. For …
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Mathematical Modeling and Scanning Electron Microscopic Study of Biofilm on Adsorptive Media (Orthogonal Collocation Method)
… term is nonlinear; and substrate diffuses in a layered-media. An advanced numerical technique, the Global Orthogonal Collocation Method, was employed to solve the model.
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