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 56 for “"Surface Scattering"”.
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Kirchhoff approximation for rough surface scattering
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1993
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Applications of numerical models for rough surface scattering
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Spectroscopic surface scattering of confined acoustic phonons in silicon nanostructures
The specularity of phonons at rough crystal surfaces is a fundamental aspect of phonon transport in nanostructures. It directly impacts engineering problems such as heat conduction in nanostructures and dissipation in nanomechanical resonators. At room temperature, the available guidance from …
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The Monte Carlo techniques with pulse compression for rough surface scattering
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1996.
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Rough surface scattering under Gaussian beam illumination and the Kirchhoff approximation
In this thesis, an analysis of the scattering of a rough perfect electric conductor (PEC) surface under illumination by a Gaussian beam using the Kirchhoff approximation is presented. The analysis assumes a source distribution which yields a Gaussian beam solution as a radiated field. This field is …
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Rough Surface Scattering and Propagation over Rough Terrain in Ducting Environments
The problem of rough surface scattering and propagation over rough terrain in ducting environments has been receiving considerable attention in the literature. One popular method of modeling this problem is the parabolic wave equation (PWE) method. In this method, the Helmholtz wave equation is …
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On Quantum Reflection and The Casimir Effect : Application to atom-surface scattering
Quantum reflection of the light, neutral and surface sensitive 3He-atom is a novel method for investigating long-range attractive atom-surface potentials. This thesis presents the detailed analysis of experimental data obtained with the Atomic Beam Spin Echo (ABSE) spectrometer by scattering 3He …
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Effect of correlation between shadowing and shadowed points in rough surface scattering
Shadowing of random surfaces is accounted for by multiplying the Kirchhoff electric current density by a shadowing function. The shadow-corrected incoherent intensity is computed in the backscatter direction and is found to be proportional to the probability of a specular point being illuminated …
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Quantum dynamics in laser–assisted collisions, laser–molecule interactions, and particle–surface scattering
… homonuclear diatomic molecular ions, and for the scattering of an ion in front of a metallic surface. For laser-assisted proton – hydrogen collisions it is shown, that strong circularly polarized radiation significantly alters the capture and ionization probabilities and results in a dichroism …
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A Curvature-Corrected Rough Surface Scattering Theory Through The Single-Scatter Subtraction Method
… presented to study radio propagation and rough surface scattering problems based on a reformulation of the Magnetic Field Integration Equation (MFIE) called the Single-Scatter Subtraction (S^3) method. This technique amounts to a physical preconditioning by separating the single- and …
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A Study of Rough Surface Scattering Phenomena in the LMDS Band (28 GHz)
… study, the properties of the reflected paths and scattering phenomena were investigated in the LMDS band (28 GHz). We used the newly developed sampling swept time delay short pulse (SSTDSP) sounder to collect field data in certain locations on the Virginia Tech campus. The sounder collected the …
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I. Mechanism of Ethylidyne Formation on Ni(111) and II. Design of a Molecular Beam-Surface Scattering and Surface Analysis Instrument
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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Investigations of electron scattering mechanisms at the silicon-silicon dioxide interface
… was conducted to determine the possible scattering mechanisms of electrons at the silicon-silicon dioxide interface. Theoretical surface conductivity mobility in a semiconductor space-charge region for the temperature range 1000K to 4000K was calculated using a classical Boltzmann-Fuchs …
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Theory and Experiments of Scattering From Microscale Random Rough and Deterministic Surfaces
Surface scattering has received considerable attention in the last few decades and is of interest in various engineering disciplines including thermal system design, optical remote sensing and photorealistic image generation. A combined experimental and theoretical investigation has been conducted …
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Semiclassical studies of decoherence produced by scattering
The conventional notion of coherent atom-surface scattering originates from the existence of Bragg peaks in elastic scattering. The helium atom acts as a quantum mechanical matter wave that is coherent with itself; the well-defined phase relationship of the particle beam at the different spatial …
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An integrated modal approach to surface and volume scattering in ocean acoustic waveguides
… variations in ocean properties, including rough surfaces and volume fluctuations in the ocean or seabed. Such inhomogeneities scatter part of the incident acoustic field, stripping energy from the coherent part of the field. This scattered energy, or reverberation, propagates further in the modes …
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The applicability and accuracy of computer modeling in regards to acoustical scattering by a complex geometry
… to the Characterization and measurement of surface scattering uniformity. The uniformity of scattering can be analyzed and can give one an indication of the diffusive properties of the test samples. The product for which the testing is proposed, as previously mentioned, is a modification of …
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Interfacial Segregation in Perovskites and Applications to Boundary Layer Devices
… the properties of many materials. For example, surface segregation in single crystals may change the surface scattering of carriers, and electron emission characteristics. In polycrystalline materials, segregation of defects to grain boundaries may affect corrosion resistance, sintering …
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Effective mobility in silicon surface channels as measured with the MOS transistor
… was made of the effective mobility in silicon surface channels. Theoretical pursuits included a) ,specialization of the existing effective mobility theory to silicon and to the MOS transistor, and b) extension of the existing effective mobility theory by the removal of various simplifying …
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A Study of MLFMA for Large -Scale Scattering Problems
… parallel efficiency and scaling. The large-scale scattering program (LSSP), based on the ScaleME library, was used to solve ultra-large-scale problems including a 200lambda sphere with 20 million unknowns. As these large-scale problems were solved, techniques were developed to accurately estimate …
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