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 14 of 14 for “"instability analysis"”.
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Instability Studies on a Spherical Inertial Electrostatic Confinement
… is essential to develop a reliable and flexible instability analysis method for an equilibrium plasma in a potential well. Subsequently stability of this well can be studied. As a part of this study, methods are sought to avoid or suppress any destructive instabilities. Methods to be explored …
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Study on dynamic behavior of ring-cavity quantum-cascade lasers with group velocity dispersion
… Previous research on QCLs shows that the instability and dynamic behaviors are more complicated than conventional semiconductor lasers due to interaction among various intracavity effects, such as material nonlinearities, unique gain and dispersions. Group velocity dispersion (GVD) plays …
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The onset of gouging in high-speed sliding contacts
… welding, and Kelvin-Helmholtz waves, a linear instability analysis was also performed. A total of 22 railgun experiments were performed to explore different aspects of gouging. Through these experiments, the effect of new slider materials, thin aluminum coatings, and macroscopic rail …
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On the interaction of rate-induced and bifurcation-induced tipping in ecosystems
… Specifically, we use classical bifurcation analysis to identify a codimension-three degenerate Bogdanov-Takens bifurcation: the organising centre for bifurcation-induced tipping (B-tipping) and the source of a dangerous subcritical Hopf bifurcation. We introduce basin instability analysis to …
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Analysis, detection and early warning control of dynamic rollover of heavy freight vehicles
… design of the early warning based roll instability enhancement system is realized through systematic investigations on static and dynamic roll behavior of the vehicles, identification of indicators for the onset of instability, and reliability analysis. The relative and absolute roll …
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Uncertainty analysis of disc brake squeal propensity
… problem but the popular complex eigenvalue analysis (CEA) as a prediction tool is linear, while the material properties, operating conditions and friction behavior at the rotor-pad contact interface are not known accurately. In this thesis, the uncertainty analysis is used to improve the …
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Covariant thermodynamics & relativity
… may occur. Within this work, the two-stream instability analysis is extended to the relativistic domain. As far as the author is aware, such extension has not been discussed in the literature. The analysis allows to assess the stability and causality of relativistic models of matter and their …
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Dynamics of the innate immune response to infection: a mathematical modelling approach
… forms of cell death. Through use of Turing instability analysis and simulated solutions of the lesion model, I show that the spatial structure of lesions can arise simply through the interactions of infected and uninfected phagocytes, bacteria and a chemokine. I also demonstrate the …
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Hindfoot and forefoot kinematic differences among individuals with and without Functional Ankle Instability
… of giving-way, known as Functional Ankle Instability (FAI). It has been proposed that altered joint kinematics during activity may contribute to instability in these individuals, however research findings have been inconsistent. Objective: To capture foot and ankle kinematic data during …
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NUMERICAL ANALYSIS OF CO-FLOWING IMMISCIBLE LIQUIDS IN CO-AXIAL MICROTUBES
This research developed dimensionless correlations, based on the numerical simulations, for the boundaries between the dripping, transition and jetting regimes. Additional correlations are also developed for the radius and formation frequency of disperse droplet in the dripping regime and the …
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Drug Loaded Multifunctional Microparticles for Anti-VEGF Therapy of Exudative Age-related Macular Degeneration
… voltage increasing. A theoretical model using instability analysis has been developed to understand the process physics and predict the process outcome. Meanwhile, the biodegradation time of PLGA MPs as well as the bioavailability of Lucentis under single-axial electrospray is tested by …
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Electrostatic control and enhancement of film boiling heat transfer
… suppress the Leidenfrost state. Detailed linear instability analysis is conducted to investigate the growth of electrostatically-induced perturbations on the liquid-vapor interface in the Leidenfrost state, and predict the threshold voltage required for suppression. The third part of this …
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Mixed-Phase Solidification of Thin Silicon Films on Silicon Dioxide
… relationship. This local-interface-curvature analysis reveals how the anisotropic nature of the Si/SiO2 interfacial energy and the film thickness affect the surface texture evolution observed during the MPS processing of Si films on SiO2. Our model of MPS is noteworthy in that it is in …
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Modeling of shock boundary layer interactions and stability analysis using particle approaches
… between two contact surfaces. A Kelvin-Helmholtz instability arising at the shear layer results in an unsteady flow for the highest Reynolds number. These findings suggest that consideration of experimental measurement times is important when it comes to deter- mining the steady state surface …