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 44 for “"local stability"”.
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A spectral method determination of the first critical Rayleigh number for a low-Prandtl number crystal melt in a cylindrical container
… system of ordinary differential equations. A local stability analysis using the linearized system determines the first critical Rayleigh number. The results are compared with experimental data and a numerical study.
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An SCIR Model of Meningococcal Meningitis
… prone countries. Analysis of the model shows the local stability of the disease free equilibrium, the existence of an endemic equilibrium and computation of the reproduction number, ℜ0 . Using a MATLAB program we simulate a time course of the model using parameters gathered from the World Health …
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Feedback Stabilization of Inverted Pendulum Models
… systems, as well as demonstrate the concepts of local stability, observability, controllability and detectability of linearized systems under varying parameters. Some examples of constant disturbances and effects are considered. The ultimate goal is to examine stabilizability, through both static …
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Control of a nonlinear underactuated system with adaptation, numerical stability verification, and the use of the LQR Trees algorithm
… a suitable Lyapunov Candidate used for proofs of stability, with claims of local stability made using Barbalat's Lemma. This provides us with a local domain of attraction for the altered classical nonlinear adaptive controller. In addition, the algorithm known as LQR Trees is applied to the system …
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A Three Dimensional Model of Virus Dynamics in HIV Patients
… point in the interior of Γ.</p> <p>The local and global stability of each equilibrium point is then studied. If N < N<sub>c</sub>, the local stability of the uninfected state is confirmed by showing the eigenvalues of the Jacobian matrix have negative real parts. A Lyapunov function is …
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Estabilidade local de painéis cilíndricos enrijecidos
… results from a non-linear analysis of elastic local stability of stringer stiffened cylindrical shells under axial compression are presented. The effects due to stiffeners spacing and slenderness as well as modal interaction and inicial geometric imperfections are investigated. It is shown that …
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The stability and control of curved liquid jet break-up
… of the linear and nonlinear models. A local stability analysis has been developed which can be used to investigate jet stability at any point on the jet at any time. The use of this model concerning break-up of a ligament and short wave generation at break-up is discussed. The …
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The stability and control of curved liquid jet break-up
… of the linear and nonlinear models. A local stability analysis has been developed which can be used to investigate jet stability at any point on the jet at any time. The use of this model concerning break-up of a ligament and short wave generation at break-up is discussed. The …
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Characterization of the dynamic response of continuous system discretized using finite element methods
… usually undesirable in engineering practice, the stability characterization of a system's behavior becomes essential. In this work, a numerical procedure to characterize the dynamic stability of continuous solid media, discretized using finite element methods, is proposed. The procedure is based …
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A Mathematical Model of the Dynamics of an Optically Pumped Codoped Solid State Laser System
… the equilibrium solutions are obtained and a local stability analysis is performed. The system of rate equations is solved numerically and the effects, on the solution, of varying physical parameters is discussed.</p> <p>Finally, the third part addresses the oscillatory behavior of the system …
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Modeling coupled physics and biology in ocean straits
… reviewed and an in-depth global equilibrium and local stability analysis of a Nutrient-Phytoplankton-Zooplankton (NPZ) model is performed. This analysis includes parameter studies and methods to evaluate parameter sensitivity, especially in the case where some system parameters are unknown. As an …
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Stable configurations for population and social dynamics
This dissertation investigates global and local minima in two models: the Lotka--Volterra model for population dynamics and a tractable polarized opinion social dynamic model. This dissertation contains stability results of the Lotka--Volterra model when induced by a cycle graph food web network. …
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The stability of model ecosystems
… different routes to study ecosystem stability of model ecosystems: classical community ecology and classical population ecology. In community ecology models, we can study the mathematical mechanisms of stability in general, large model ecosystems. In population ecology models, fewer …
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On Motion Mechanisms of Freight Train Suspension Systems
… mapping dynamics. The corresponding analyses of local stability and bifurcation are carried out, and the grazing and stick conditions are used to determine periodic motions. Numerical simulations are to illustrate periodic motions of stick and stuck motions. Finally, from field testing data, the …
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Network level performance of differentiated services (diffserv) networks
… network level, such as end-to-end QoS, network stability, and fairness of bandwidth allocation over the entire network have been extensively investigated. It has been shown in literature that the end-to-end delay of EF traffic can go to infinity even in an over-provisioned network. In this …
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On typicality and adaptation in driven dynamical systems
… of the motion. In particular, I argue that local dynamical stability, or exit rate, of a state is typically sufficient to predict steady-state probability in such systems -- circumventing the classic no-go theorems via our disorder approximation. I then focus on one consequence of this …
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Substrate denaturation and translocation by a proteolytic machine
… forms, I investigated the role of both substrate stability and ATP consumption during the individual substrate processing steps of this protease. My results demonstrate that the rate of substrate proteolysis by ClpXP correlates poorly with global thermodynamic stability, but instead appears to be …
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Epidemiological Models For Mutating Pathogens With Temporary Immunity
… equilibriums. We will also investigate the local stability of each of these equilibriums. The possibility of Hopf bifurcation using delay as the bifurcation parameter is studied using both analytical and numerical solutions.
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On the dynamics, stability and control of displaced lunar orbits
… by the Moon-Sail two-body problem, and their local stability characteristics are investigated. It was found that orbits with a large displacement are unstable, as expected. As will be shown, displaced periodic orbits exist at all libration points at linear order. A particular use of such …
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Mechanism of active substrate delivery by the AAA+ protease adaptor CIpS
… by CIpAP due to a combination of a high local stability and a challenging translocation sequence at the junction of the NTE and folded core domain. I propose a model in which CIpA remodels CIpS by translocating the NTE, triggering delivery of the N-end rule substrate. Similar mechanisms …
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