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 16 of 16 for “"Wave turbulence"”.
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Perpendicular Ion Heating by Low-frequency Alfven-wave Turbulence
… proposed models is based on low-frequency Alfven waves (o << O i) launched from the coronal base. Theoretical studies and numerical simulations have shown that Alfven-wave low-beta turbulence primarily cascades to smaller scales perpendicular to the mean magnetic field rather than smaller parallel …
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Contributions in fractional diffusive limit and wave turbulence in kinetic theory
… we consider the equations coming from weak wave turbulence theory and we study them via mean-field limits of finite stochastic particle systems. $\textbf{Anomalous transport from kinetic models.}$ The goal is to understand how fractional diffusion arises from kinetic equations. We explain …
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Theory and simulation of electrostatic wave turbulence in the space shuttle-induced plasma environment
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Investigations of the cascade of Langmuir wave turbulence over HAARP Observatory in Gakona, Alaska
… investigates the cascade lines from Langmuir wave turbulence as a result of Parametric Decay Instability (PDI) in the ionosphere. This effect is studied using a high-frequency (HF) heater located at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) Observatory in Gakona, …
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Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
… are the excitation and observation of Langmuir wave turbulence caused by the parametric decay instability (PDI) in high-frequency space plasma heating experiments conducted at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska during the spring and …
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Understanding of weak turbulence of capillary waves
First developed by Zakharov, Weak Turbulence Theory (WTT) aims at describing the steady-state statistical property of an ensemble of waves in weakly nonlinear interactions. In the wavenumber k domain, the WTT steady-state analytical solution yields a power-law inertial-range spectrum I - ka, with a …
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Direct and inverse turbulent cascades in a 2D Bose gas
… and (iii) the theoretical background for wave turbulence in Bose gases. We then turn to our experimental work; all of which begins with a quasi-pure 39K condensate, strongly confined along one direction to realise a 2D system and trapped in a uniform in-plane potential. The first study is …
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Two-Color interferometry as a fluctuation diagnostic on Alcator C-Mod
… electron density fluctuations for turbulence and transport studies. Heterodyne signals from ten vertical-viewing CO2 laser chords are demodulated relative to a local oscillator using high bandwidth analog in-phase/quadrature electronics, replacing lower bandwidth digital fringe …
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On the interaction of ocean waves and turbulence
The interaction of ocean waves and turbulence is a fundamental process in the ocean. Understanding and prediction of wind-wave generation, propagation, breaking, non-linear interactions and extreme wave development are directly linked to this complex and not well understood phenomenon (Thorpe …
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Laboratory scale experiments with water surface waves
… small scale, for the study of surface gravity waves. A number of measurement techniques are developed and implemented to capture space and time evolution of waves on a water surface in gravity, gravity-capillary and capillary ranges with the purpose to study the statistics of wave turbulence in …
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Energy loss and equilibration of a highly energetic parton in QCD plasmas
… the hard sector to the medium scale akin to weak wave turbulence. The turbulent cascade is characterized by a stationary solution known as the Kolmogorov-Zakharov spectrum, which is recovered at intermediate energy scales. This Kolmogorov-Zakharov spectrum leads to a scale invariant energy flux …
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Sound Waves and Turbulence in Two-dimensional Bose Gases
… part of the thesis concerns the emergence of the wave-turbulent cascade, as the gas is driven further and further from equilibrium. We monitor how the cascade builds up from large to small length scales starting from the microscopic dynamics of the discrete low-lying quantum states of the system. …
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Wave-particle interactions in the solar wind and solar flares
… interactions between particles and plasma waves play an important role in both the solar wind and solar flares. The dynamics of plasma turbulence in these settings controls the strength of the interactions, by determining the amplitudes of the small-scale electromagnetic fluctuations that …
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A Theoretical and Numerical Study of Turbulent Wind-Wave Interaction
A deep understanding of turbulent wind-wave interactions is critical for many applications, such as weather modeling in the marine environment, navigation safety of marine vehicles, and offshore wind energy harvesting. The present understanding of the fundamental flow dynamics underlying wind-wave …