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 95 for “"plunge"”.
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Headcut retreat resulting from plunge pool erosion in a 3D landscape evolution model
Headcut retreat produced by plunge pools is represented using existing concepts about this type of erosion. The model estimates retreat rates, given flow, height of the headcut, upstream slope and Manning's roughness, and the relevant soil parameters (erodibility and critical shear stress). The …
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The Effects of Basin Slope and Boundary Friction on the Character and Plunge Location of Hyperpycnal Flows Entering a Laterally Unbounded Basin
… confined. These studies allow the flow to plunge only in two directions, the horizontal x-direction and the vertical z-direction. The goal of this study is to determine if there is observable plunging of hyperpycnal flows in the lateral y-direction, i.e. lateral spreading, in a three …
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Middle school plunge: a mixed-methods study exploring 6th grade students' perceptions of their transition to middle school experiences and its influences on school achievement and performance for urban youth
… transitional experiences and The Middle School Plunge academic decline phenomenon that impacts minority youth once they move into 6th grade (West & Schwerdt, 2012). Some researchers on the topic assert that middle school grade configurations influence student achievement outcomes and that …
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Aeroelastic Analysis of Membrane Wings
… In this thesis, aerodynamics of pitch and plunge are simulated using a 3-D, free wake, vortex lattice method (VLM), and structural characteristics of the wing are simulated as a membrane supported by a rigid frame. The aerodynamics is validated by comparing the results from the VLM model …
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The Analysis of Multimedia through the Lens of Music Theory: A Model for Analyzing the Interaction of Auditory, Visual, and Narrative Stimuli in Multimediatic Artforms
… a particular synchronization schema I call the plunge—that moment when a narrative agent makes a risky and definitive choice, which can range from minor dramatic moments to piece-defining climaxes. Comparing instances of the plunge in television, film, opera, ballet, and video games demonstrates …
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Feedback linearization and adaptive control of a nonlinear aeroelastic system
… results show that control of pitch angle and plunge displacement can be accomplished; Then, adaptive output feedback control law is examined. For the synthesis of the controller, it is assumed that only pitch angle and plunge displacement are measured. A canonical state variable representation …
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Analysis and Modeling of Plunging Flows
… and Best et al. (2005) observed a shifting plunge line and pulsing underflows in the field. In this research, we developed a theoretical model, an interplay between the flow momentum upstream of the plunge line and the turbulent Rayleigh-Taylor instability, to offer rational explanations for …
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Optimization of conditions for vitrification of aqueous solutions of relevance to cryobiology
… herein were designed to contribute to the plunge-cooling method of cryopreservation. The importance for further development of current plunge-cooling methods is for the cryopreservation of cell-types sensitive to the other method of cryopreservation, slow-equilibrium freezing. The purpose …
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Adaptive, suboptimal and nonlinear control of an aeroelastic system
… system. The aeroelastic model describes the plunge and pitch motion of a wing. The model includes plunge and pitch nonlinearties, and has a single control surface for the purpose of control. First an output feedback modular adaptive control system is derived. Quasi-steady aerodynamic model is …
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Ultrasonic seaming of PET, PET/cotton blend, and spectra fabrics
… from continuous mode of operation to that of plunge mode. Regression and analytical tests were used to analyze the results.</p> <p>Results indicate weld time and pressure have a significant affect on seam efficiency and stiffness, while amplitude influenced seam properties in conjunction with …
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The flow of rivers into lakes: Experiments and models
… inflow were interpreted as a laterally falling plunge region with little mixing, an underflow region with substantial mixing, and finally an intrusion. A simple theory for a laterally falling plunge region was developed, giving the ratio of offshore extent of the plunge region to river width as …
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Suppression of limit cycle oscillations in an aeroelastic system using robust and adaptive control
… system. The aeroelastic model describes the plunge and pitch motion of a wing. The model includes plunge and pitch nonlinearities, and has both leading and trailing edge control surfaces for the purpose of control. First the existence of limit cycle oscillations and domain of stability …
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Geology of the Blacksburg area, Montgomery County, Virginia
This 17 square mile area, on the western plunge of the Catawba syncline and the eastern plunge of the Price Mountain anticline, consists of the Cambrian Rome and Elbrook Formations thrust over younger Cambrian, Ordovician, and Mississippian rocks. The more or less age autochthonous rocks are the …
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Characterization of Heat Transfer Enhancement for an Oscillating Flat Plate-Fin
… flow. Reduced frequencies of 0.25 ≤ k ≤16 and plunge amplitudes of 0.03125 ≤ h ≤ 8 are investigated at Re=100 and Pr = 0.71. It is shown that the combined effect of frequency and amplitude on heat transfer enhancement can be accounted for as a single parameter “plunge velocity” (0.25 ≤ kh ≤ 4) …
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Scour under air entrained jets below dams and flip buckets
… x, y and z. It was. surmised by the writer that plunge pool air entrainment could also be a relevant parameter and apparatus was built to examine this assumption. Two dimensional testing without air indicated scour to be independent of head drop (H) and directly proportional to flow (q), such …
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Tiny
… herself and reignite her creativity she needs to plunge deeply into her multilayered psyche - an adventure that not only provides material for new creative insights but also guides Tiny to understanding herself better. She accepts the gods and demons that dwell within, recognising these complexes …
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The influence of abrasive surface topography on the basic mechanics of the metal grinding process
… of a practical grinding operation. A simplified plunge grinding operation is then considered to determine the influence of various process parameters on the mechanics of metal removal. Finally, a computer simulation of the above grinding operation, using Monte Carlo simulation techniques, is …
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A Finite Element Simulation of Temperature and Material Flow in Fricton Stir Welding
… evolution and material flow within the plunge portion of the process. Previous modeling created more heating within the billet than experimental results, probably due to the simplification of the simulation with adiabatic boundary conditions. More realistic tooling temperatures were …
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The Impact of Corporate Crisis on Stock Returns: An Event-driven Approach
… predictive variables for stock surge and stock plunge. Based on our trained hybrid deep learning model, we generate relevance scores for language features in news titles and tweets, which can indicate the amount of contributions these features made to the final predictions of stock surge and …
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