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 31 for “"Travelling waves"”.
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Travelling waves in Lotka-Volterra competition models
… (diffusion) and competitive strength can cause waves of invasion to be halted and reversed. By establishing rigorous results concerning related degenerate and near-degenerate systems,we build a picture of the dependence of the wave speed on system parameters. Our results lead us to conjecture …
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mKdV Loop Travelling Waves and Interactions of Loop Solitons
The modified Korteweg-de Vries (mKdV) equation is an integrable nonlinear evolution equation which has applications in modeling various physical phenomena. It also describes the curvature of curve which undergoes a certain non-stretching geometrical evolution in the Euclidean plane. This curve …
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Implementation of travelling waves on lifting surface for drag reduction
… One such new approach is to introduce a travelling wave on the lifting surface, a technique inspired by the undulatory motion of fish. In order to manufacture and test such a surface, first the necessary design specifications must be determined. Using NACA0012 and NACA0018 wings at a …
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Travelling waves modulated by resonant currents in laterally-inhibited grids of leaky integrate-and-fire neurons
Travelling waves of neural activity are a biologically salient and analytically tractable dynamic of networks of neurons. They have been observed experimentally across the whole brain as well as at smaller scales, linked to functions as diverse as visual processing, motor coordination, and …
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On Steady Water Waves and Their Properties
… related to various aspects of steady water waves. Paper I: Deep-water waves with vorticity: symmetry and rotational behaviour. We show that for steady, periodic, and rotational gravity deep-water waves, a monotone surface profile between troughs and crests implies symmetry. It is observed …
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Interfaces between Competing Patterns in Reaction-diffusion Systems with Nonlocal Coupling
… that the model exhibits bistability between travelling waves and Turing patterns. We present a study of interfaces separating wave and Turing patterns arising from the codimension-2 instability. We study theoretically and numerically the dynamics of such interfaces in the framework of the …
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Digital simulation of fault location algorithms for EHV transmission lines
… covers detailed analysis of the theory of travelling waves on transmission lines, including the frequency variance of the parameters. The analysis of the two and three terminal systems is carried out in the steady-state and transient conditions.
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Hydroelastic stability and wave propagation in fluid-filled channels
… to investigate the stability and propagation of waves in various fluid-filled elastic-walled channels. In Chapter 2 a linear temporal stability analysis is performed for various channel wall configurations, the results of which are compared to determine how different physical effects contribute …
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Hydroelastic stability and wave propagation in fluid-filled channels
… to investigate the stability and propagation of waves in various fluid-filled elastic-walled channels. In Chapter 2 a linear temporal stability analysis is performed for various channel wall configurations, the results of which are compared to determine how different physical effects contribute …
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The Loss in Solid Poles of Synchronous Machines On Load
… machines on load may be caused by several travelling waves and the thesis is directed towards a discussion of the problems arising from the superposition of these waves and of the effect of the superposed main field, which is stationary relative to the poles. The major part of the work is …
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Modelling the cochlear origins of distortion product otoacoustic emissions
… the cochlear response into forward and backward travelling waves, which<br/>is applied to investigate the multiple sources of both the 2f1 ? f2 and 2f2 ? f1 DPOAEs.<br/><br/>The model is used to explain and predict a variety of phenomena observed in experimental<br/>DPOAE studies. It also …
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INTRACELLULAR PATTERN FORMATION OF F-BAR PROTEIN FBP17
… dynamic biological patterns in the forms of waves and oscillations. Increasing attention is paid to their functions in efficient and robust signal transduction. However, whether plasma membrane plays an active role in wave propagation remains to be answered. In this work, I characterized the …
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Understanding flow-induced vibration via a physics-constrained, data-driven approach
… by the character, α, expresses the dominance of travelling or standing waves in the response. In a neural network model these new features are put in competition with fourteen previously known VIV parameters to see which of all these candidate features are most important. For cross-flow amplitude …
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Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy
… terahertz-frequency lattice vibrational waves that emanated outward from their multiple origins at lightlike speeds. Interferences among the waves resulted in fully specified far-field responses, including tilted, focusing, or amplified wavefronts. Generation and coherent amplification of …
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Geometric Mechanics of Active Particles
… crystal”, the presence of activity allows for travelling waves of position and orientation and the two-dimensional crystal acts as an elastic medium with Lamé constants that depend on activity. In the presence of a plane boundary, we show that the active Cosserat crystal can undergo a dynamical …
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Impulse ageing of polymeric materials
… as an overhead line. Both impulse events create travelling waves in the system, damaging insulation components and equipment. This work is concerned with the hypothesis that lightning impulses can lead to accelerated ageing of extruded polymeric cables. The results show that there may well be a …
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Analysis of the Zebrafish Segmentation Clock
… a tissue level, these oscillations manifest as travelling waves, departing from the posterior and arresting in the anterior. The position of arrest prefigures the position of the new somite boundary. The molecular network that comprises the cyclic genes and their regulation in the PSM is termed …
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Visualisation of chemistry in flow
… field which was able to produce stationary and travelling patterns. The complex structure of the stationary bands was explained by the flow, in which Taylor vortices translate axially up the tube in an approximation of plug flow. The rotation rate of the inner cylinder was identified as a new …
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Mathematical problems arising in interfacial electrohydrodynamics
… cut-off, that is, all sufficiently short waves are linearly stable. For the case of film flow down an inclined plane, the fully nonlinear equation can produce singular solutions (for certain parameter values) after a finite time, even in the absence of an electric field. This difficulty is …
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Energy modelling in the South African electric power industry
… stability studies, single and three phase travelling. Waves, and power and high ii frequency transmission line parameters. The costing and financial models include the analysis of costs of all new expansion equipment, the costs of operation and maintenance of the generation units, …
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