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 4773 for “"Propagation"”.
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Propagation
… use our grief as a souvenir of what we’ve lost? Propagation envisions a world that turns this kind of grief into an asset by processing it into a source of literal power. In this alternate world, human bodies produce a grief-triggered hormone – memorin – that can power their electrical grids. …
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High dimensional uncertainty propagation for hypersonic flows and entry propagation
To solve complex design problems, engineers cannot avoid to take into account the involved uncertainties. This is important for the analysis and design of hypersonic objects and vehicles, which have to operate in extreme conditions.;In this work, two approaches for a high dimensional uncertainty …
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Sound propagation in woodland
A review of past research into sound propagation in woodland is presented. The attenuation of sound in woodland is small between about 800 and 2000Hz and greater at low and high frequencies. Attenuation measurements made in three contrasting woodlands are presented and compared with theoretical …
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Sound propagation in streets.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1974. M.S.
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Electromechanical Wave Propagation Analysis
… measurement instruments. The speed of EMW propagation is hundreds of miles per second, much less than the electromagnetic wave propagation speed, which is the speed of light. Recently, with the development of renewable energy resources and a growth in using HVDC and FACTS devices, these …
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Sparse Matrix Belief Propagation
We propose sparse-matrix belief propagation, which executes loopy belief propagation in Markov random fields by replacing indexing over graph neighborhoods with sparse-matrix operations. This abstraction allows for seamless integration with optimized sparse linear algebra libraries, including those …
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Sound propagation around underwater seamounts
… methods which improve the understanding of sound propagation around underwater seamounts. The depth-dependent sound velocity profile of typical ocean waveguides force sound to travel in convergence zones about a minimum sound speed depth. This ducted nature of the ocean makes modeling the acoustic …
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Mechanisms of turbulent flame propagation
… eddies. It is assumed that laminar flame propagation occurs through the large eddies, whilst two approaches are considered in the case of dissipative eddies. In the first approach, laminar flame propagation across a vortex tube is employed, whilst in the second the concept of reaction time …
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Automated Defense Against Worm Propagation.
… which can automatically react to stop worm propagation. The method has to be signature independent so that it can stop new worms. In this thesis, an automated defense system (ADS) is developed to automate defense against worms and contain the worm to a level where manual intervention is …
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Sound Propagation in Inhomogeneous Media
Outdoor sound propagation is of interest in community noise problems, for example noise prediction. The interaction of sound with the ground is also of interest in remote surveillance by acoustic and seismic sensors. In this thesis, previous work concerned with sound propagating in a layered …
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Crack propagation in isotropic materials
This thesis presents a numerical study of crack propagation in brittle materials. The finite element method using constant strain triangular elements was used. The experimental investigation is based on Gurney and Hunt's quasi-static method of fracture testing.<br/><br/>The applicability of the …
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Ultrasound propagation in colloidal dispersions
… of the properties and uses of ultrasound propagation in dispersions is followed by an extensive review of theories which relate the particulate properties of the dispersions to the measurable ultrasonic parameters, velocity (c) and attenuation (a [alpha]). Measurement principles are …
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Ultrasonic propagation in cancellous bone
… theories in attempt to apply them to the propagation in cancellous bone. The work is related to a new technique which uses ultrasonic attenuation to measure and predict osteoporosis, especially in the elderly population.The ultrasonic attenuation, the longitudinal ultrasonic velocity, the …
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Investigating tau propagation in situ
… models of tau assembly suggest that prion-like propagation may underlie this progression, including the intracellular trafficking, intercellular transfer and seeded aggregation of assembled tau. However, the underlying molecular mechanisms are poorly understood. The goal of my thesis was to …
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Wave propagation in flexible tubes
Wave dissipation was previously investigated intensively in the frequency domain, in which the dissipation of waves is described as attenuation of pressure pulse decay with respect to the frequency or harmonics. In this thesis, wave dissipation, including decay of pressure pulse, peak of wave …
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Radio propagation in fire environments.
Radio propagation in the presence of fire is known to be problematic to communications. In this thesis we use both experimental and theoretical approaches to examine and understand radio propagation in fire environments. Propagation is examined for three small scale fires with broadband equipment …
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