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 86 for “"wave theory"”.
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Wave Theory based Extensions to Standard Room-acoustic Particle Models
In dieser Arbeit wurde die Anwendung von leistungsfähigen numerischen Methoden wie Finite Elemente Methode (FEM) und Randelementmethode (BEM) auf die Erweiterung von existierenden Schallpartikelmodellen untersucht. Es wurde für niedrige Frequenzen gezeigt, wie man die Wellenart des Schalls …
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A trajectory equation for walking droplets : hydrodynamic pilot-wave theory
… diffraction, tunneling, quantized orbits, and wave-like statistics in a corral. We here develop an integro-differential trajectory equation for these walking droplets with a view to gaining insight into their subtle dynamics. The orbital quantization is rationalized by assessing the stability …
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Bouncing and walking droplets : towards a hydrodynamic pilot-wave theory
… bouncing state is destabilized by the droplet's wavefield, leading to drop motion with a horizontal component called walking. The walking drops are of particular scientific interest because Couder and coworkers have demonstrated that they exhibit many phenomena reminiscent of microscopic quantum …
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Wave theory modeling of three-dimensional seismo-acoustic reverberation in ocean waveguides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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New full wave theory for plane wave scattering by a rough dielectric surface - the fictitious current method
A new full wave method for scattering of plane waves from a rough dielectric surface is developed. This new theory begins by postulating a zero-order field solution which does not satisfy Maxwell's source-free field equations. The zero-order field, however, is made to satisfy Maxwell's source …
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Asymptotic studies of gravity-driven reacting coating flows and pultrusion processes
… is large and heat release is significant, long wave theory and large activation energy asymptotics are applied jointly to derive a consistent set of governing equations, which describe wave formation on the free surface and evolution of the reaction front. The key feature shown by the solution …
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Theory and fabrication of colloidal-crystal Bragg filters
A theory, based on material parameters, is developed for colloidal-crystal Bragg filters. The coupling constant, for coupled-wave equations, is derived to produce filter spectra. The spectra are modified by convolving with a Gaussian function to represent crystal defects. Scattering losses are …
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Water Wave Refraction with Non-Linear Theory
<p>Two different kinds of wave refraction models are formulated in the present study using Stokes' third order wave theory. One type of model is utilized in a parametric study employing several different topographies. Wave trajectories obtained from this model, when obtained by using first and …
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A three-dimensional coupled modes solution for range-dependent waveguides
… environments. Numerical implementations of wave-theory solutions for range-dependent acoustic problems can be classified as: normal-mode techniques (adiabatic or coupled modes); parabolic-approximation techniques (narrow- or wide-angle parabolic equations solved by split-step or …
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The interaction of periodic surface gravity waves with slowly varying water currents
… for interactions between surface gravity wavetrains and slowly-varying water currents are derived and the incorporation of Vocoidal water wave theory into this framework is discussed. The emphasis throughout is on the derivation of the general form of the governing equations plus a …
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Development of an Engineering Model for Prediction of Ground Shock From Decoupled Detonations
… radial particle velocities from elastic plane-wave theory with appropriate attenuation.
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Contributors to Lifelong Moderate Physical Activity in the Lives of Women
… initiate contact with participants. The grounded theory approach was utilized. Data were analyzed using content and constant comparative analysis. Findings. Six themes, supported by subthemes, emerged from analysis of the data. The participants: perceived themselves as physically active, lead …
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Investigating Wave Forces on Coastal Bridge Decks
Tsunamis and hurricane induced waves are responsible for many coastal bridge failures, especially in the last decade. In the current study, three countermeasures (reducing the entrapped air, elevating the structures and rigidifying the structures) are considered, two wave types (solitary wave …
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Efficient perturbative framework for coupling of radiative and guided modes in nearly periodic surfaces
… computing the coupling of radiative and guided waves in slowly varying (nearly uniform or nearly periodic) surfaces, which is especially relevant to the exploitation of nonlocal effects in large-area metasurfaces. Our framework bridges a gap in the theory of slowly varying surfaces: aside from …
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Non-migrating tides in the Martian thermosphere
… to non-migrating tides is dominated by wavenumber 2 and wavenumber 3 harmonics during the periods studied. Comparison with the Neutral Ion and Gas Mass spectrometer (NGIMS) shows a good agreement in wave amplitudes observed for the first two cases studied. The temperatures and 𝑂/𝐶𝑂# …
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Systematic calibration of a theory-based transport model of tokamak plasmas
… from seven different tokamaks. The transport theory includes neoclassical, $\rm drift/\eta\sb{i},$ circulating electron mode, kinetic ballooning, neoclassical magnetohydrodynamic (MHD), and resistive ballooning effects. An important feature of this study is a reproducible simulation …
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Communal pairing in Fermi gases with attractive interactions
… superfluids, Fulde–Ferrell–Larkin–Ovchinnikov theory, and pair density wave theory. We propose a further extension of a superconducting state, dubbed a communal pairing state, whose underlying components are superpositions of Cooper pairs that share minority-spin fermions. This state includes …
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Monte Carlo simulation model for electromagnetic scattering from vegetation and inversion of vegetation parameters
… research, a coherent scattering model for microwave remote sensing of vegetation canopy is developed on the basis of Monte Carlo simulations. An accurate model of vegetation structure is essential for the calculation of scattering from vegetations, especially those with closely spaced elements …
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High resolution scattering measurements for stationary particles
… a way that can be quantified by electromagnetic wave theory. This scattering distribution is directly related to the cylinders diameter and material properties, as well as the wavelength of the incident light. This project designed and implemented a rig that measures the scattering distribution …
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Neoliberal globalization, racism and education: The model minority thesis in education policy
… policy research, which I summarize as Wave Theory, can rematerialize anti-racist policy analysis, strategy and social justice based initiatives in education.
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