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 43 for “"propagation speed"”.
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Tropical Cyclone Hazards in Relation to Propagation Speed
… impact the coast. A recent study shows that the propagation speed of tropical cyclones has slowed over the past 60 years, which can lead to greater accumulation of precipitation and greater storm surge impacts. The study presented herein is meant to examine and analyze the relationships that …
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Development of a geometric model for the study of propagating stall inception based on flow visualization in a linear cascade
… separated boundary layer occurred with no propagation. The observed propagating stall process was the development of a vortex in the boundary layer and its subsequent shedding. The shedding mechanism was observed to be the interference by the reverse flow from the previously stalled passage …
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Microphysical Influences on cold pools
… factors for cold pool strength, depth, and propagation speed hampers these efforts. Prior studies have investigated the influence of different hydrometeor types upon the formation of the initial cold pool but have reached drastically different conclusions. This study uses CM1 (“Cloud Model …
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On the convergence of higher-order finite element methods to weak solutions
… to weak solutions in order for the discontinuity propagation speed to be correct. As shown by the Lax-Wendroff theorem, one method to guarantee that convergence, if it occurs, will be to a weak solution is to use a discretely conservative scheme. However, discrete conservation is not a strict …
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Microwave engineering in superconducting nanowires for single-photon detection
… to resolve photon numbers. Utilizing the slow propagation speed of electrical signals in the nanowire transmission lines, we developed a delay-line-multiplexed detector array. This two-terminal array can perform coincidence counting over a large number of spatial modes and can be scalably …
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Analytical and Computational Study of Flame Acceleration in Tubes: Effect of Wall Friction
… is especially strong in the case of flame propagation in tubes or channels. Being a reasonably simple configuration to investigate fundamental flame properties, combustion tubes have numerous practical applications such as safety issues in mines, subways and power plants. This work is …
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Model-based cardiac CT segmentation and 3D heart reconstruction
… on hand-draw sampling points. The fast-marching propagation speed at each location is controlled by the generated GMMs. After that, a parametric cylinder model based algorithm is proposed to remove the unnecessary vena cava from the segmentation result. The segmentation results are analyzed and …
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The Genesis and Evolution of African Easterly Waves
… baroclinic structure. The growth rate, the propagation speed and the overall structure of the observed easterly waves (Reed et al., 1977) are well reproduced in the model.
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Design of elastic metamaterials
… was derived and utilized to investigate the wave propagation in the elastic metamaterials. The effective continuum model works for long wavelength, and is able to accurately determine the band-gap region. In addition, the applications of double negativity metamaterials such as negative refraction …
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Quantitative Hydrodynamics Analysis of Left Ventricular Diastolic Dysfunction using Color M-Mode Echocardiography
… health and demonstrated that the filling wave propagation speed is a significant index of the severity of diastolic dysfunction. However, the governing flow physics underlying the relationship between propagation speed and diastolic dysfunction are poorly understood. More importantly, currently …
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An Investigation of the Role of Land-Atmosphere Interactions on Nocturnal Convective Activity in the Southern Great Plains
… cold pool strength, squall line morphology and propagation speed, and storm rainfall. At the meso-gamma scale, differences in land-cover and soil type have as much of an effect on the simulated pre-storm environment as the choice of PBL parameterization: MYJ simulations exhibit strong …
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Propagation of premixed flames in confined channels
The propagation of premixed flames in confined channels is investigated. In the unconfined case, the structure of the flame and the flame speed for the adiabatic planar flame have been numerically obtained and confirmed with the existing theory. It is seen that in the unconfined case, the flame …
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Travelling Wave Analysis of a Nonlinear Diffusion Equation
… key measurable quantities being the width and propagation speed of the proliferating region. In this thesis we consider the continuum limit of a model of an off-lattice, cell-based simulation of a contact-inhibited cell monolayer. Numerical solutions of the continuum model, which can be …
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Electromechanical Wave Propagation Analysis
… of synchrophasor 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 …
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Surface heat fluxes and MJO propagation through the Maritime Continent
… (MC) is a known hurdle in understanding the propagation of the Madden-Julian Oscillation (MJO). To understand the differing dynamics of MJO events that propagate versus stall over the MC, a new MJO tracking algorithm utilizing 30-96 day filtered NOAA Interpolated OLR anomalies is presented. …
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Seasonality of the Agulhas Current with respect to near- and far-field winds
… is found to be highly sensitive to the propagation speed of Rossby waves, which determines the arrival time of the wind stress signal at the western boundary. By matching Rossby wave speeds to those observed using altimetry, an Agulhas Current with a maximum flow in February and a …
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Sea level variability and coastal trapped waves around southern Africa
The propagation characteristics of the coastal trapped waves (CTWs) around the coast of southern Africa were investigated by analyzing the observed daily mean sea level data from 16 coastal tide gauges, as well as outputs of sea level anomalies from the Hybrid Coordinate Ocean Model (HYCOM) at a …
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Lamb wave propagation in laminated composite plates
… To have a general solution for Lamb wave propagation in multilayered composite laminates is not practical due to a large number of boundary conditions needed to be satisfied at the interlaminar interfaces. Various approximate theories have been proposed to model low frequency Lamb wave …
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Moored observations of shelfbreak processes at the inflow to and outflow from the Arctic Ocean
… the mean flow of 0.27 m/s, resulting in a total propagation speed of 0.72 m/s. They have a peak azimuthal speed of 0.22 m/s at a radius of 7.8 km and contain overflow water in their core. In the absence of the cyclones, the background flow is dominated by the East Greenland Spill Jet. This is …
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Oceanic planetary waves in the coupled ocean-atmosphere system
The propagation of planetary, or Rossby, waves is studied under the effects of different atmospheric couplings. First, analytical matchings are formulated in which a Rossby wave is coupled to different thermodynamical atmospheres, from a simple heat flux condition to the inclusion of an atmospheric …
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