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 34 for “"chaotic behavior"”.
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Chaotic behavior and energy polarisation in flatband lattice models
… investigate the wave packet dynamics and chaotic behaviour of a simple tight-binding system exhibiting FBs, the so-called stub lattice model. Initially we show the existence of a FB and of two dispersive frequency bands for this model and identify three different dynamical regimes, namely …
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Effects of the chaotic behavior of a superposition of waves in the flux across a channel
… were carried out to study the effects of chaotic behavior on the net tracer flux across a channel. The flow is given by a superposition of two propagating waves. The domain was set up so that a mode-I wave would fit on it, and the perturbation was a mode-4 wave. The experiments were …
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An Investigation of Determinism and Chaotic Behavior in Flight Performance Data: A Chaos Theory and Nonlinear Time Series Analysis Approach
… analysis methods to determine deterministic chaotic behavior in the data. Using a sequence of steps of non-linear methods, four flight performance data were used to investigate for the existence of deterministic chaotic behavior. Results revealed that flight performance data may exhibit …
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Invariant measures for inner functions
This thesis describes the chaotic behavior of inner functions in the unit disk and in the upper half plane. Absolutely continuous invariant, measures for inner functions, ergodicity and exactness will be discussed. Moreover, under some conditions, we prove that the restriction of an inner function …
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Controlling Chaos in Dynamical Systems Described by Maps
… parameter of the system is perturbed. The chaotic behavior is successfully suppressed and the maps are stabilized about an unstable fixed point. Next, a more complex two-dimensional map is studied: the dynamics of a marker particle advected by the flow field generated by a blinking vortex. …
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Computational Studies in Chemical Quantum Physics
… The vector model shows some differences in behavior as compared to the hopping model. In certain regimes the vector model shows chaotic behavior.
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RETI DI CONTROLLO A CAPACITÀ COMMUTATE PER CONVERTITORI DC/DC PWM
… it easily highlights the different dynamic behaviors of power devices such as limit cycle, chaotic behavior and local bifurcations. The filter and the converter were simulated by both Matlab, Simulink, and SPICE. An important part of the work was the sensitivity analysis of the circuit with …
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Nonsmooth Bifurcations and the Role of Density Dependence in a Chaotic Infectious Disease Model
… Classically, the minimal dimension to observe chaotic behavior in an ODE model is three; whereas it can be achieved in a one-dimensional discrete map. It is often the choice of mathematical biologists to use discrete systems as it fills many roles such as sparse data, incorporation of life …
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Stochastic chaos and thermodynamic phase transitions : theory and Bayesian estimation algorithms
The chaotic behavior of dynamical systems underlies the foundations of statistical mechanics through ergodic theory. This putative connection is made more concrete in Part I of this thesis, where we show how to quantify certain chaotic properties of a system that are of relevance to statistical …
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Mechanical relaxations, spin glasses and 1/f resistance noise
… were tested and no evidence was found for chaotic behavior with temperature changes. These results, and others, are more consistent with hierarchical models for the spin glass phase space.
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Mechanical relaxations, spin glasses and 1/f resistance noise
… were tested and no evidence was found for chaotic behavior with temperature changes. These results, and others, are more consistent with hierarchical models for the spin glass phase space.
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Iterated Grid Search Algorithm on Unimodal Criteria
… for unimodal function to avoid the possible chaotic behavior of the function. Furthermore, in case the loss function to be optimized is not unimodal, we suggest a weaker condition: almost (noisy) unimodality, under which the iterated grid search finds an estimated optimum point.
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Effects of broad-banded higher harmonics on fatigue damage of risers due to vortex-induced vibrations
Recent works have discussed "chaotic" or "Type-II" riser motion and suggested that it is a general feature of VIV riser response. Chaotic riser response contains broad-banded harmonics and a combination of standing and traveling waves, unlike periodic or " Type-I" motion which contains only …
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Noniterative construction of optimal quadratically-nonlinear ODE models from time series
… for ODE systems having solutions that exhibit chaotic behavior. The approach is illustrated with numerical examples demonstrating its utility for a variety of nonchaotic and chaotic time series, including systems where the time series is corrupted by multiplicative noise, and for cases where a …
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Physical Realizations of Memory Capacitive Systems
… charged-voltage and capacitance-voltage curves. Chaotic behavior is demonstrated for some amplitudes of a sinusoidal applied voltage.</p>
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Complex dynamics of a microwave time-delayed feedback loop
The subject of this thesis is deterministic behaviors generated from a microwave time-delayed feedback loop. Time-delayed feedback systems are especially interesting because of the rich variety of dynamical behaviors that they can support. While ordinary differential equations must be of at least …
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Investigating chaos by the generalized alignment index town (GALI) method
… is the discrimination between regular and chaotic behavior. Over the years several methods of chaos detection have been developed. Some of them, such as the construction of the system's Poincar´e Surface of Section, are appropriate for low-dimensional systems. However, an enormous number of …
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Reduced rank filtering in chaotic systems with application in geophysical sciences
… Here, the focus is on geophysical systems with chaotic behavior defined as extreme sensitivity of the dynamics to perturbations in the state or parameters of the system. In particular, uncertainties in a chaotic system experience growth and instability along a particular set of directions in the …
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The Dynamics of Rigid Bodies on Moving Deformable Support Media
… nonlinearities and, under some circumstances, chaotic behavior. For that reason, since the first model proposed by G. W. Housner in 1963, a number of alternative models have been proposed for its mathematical simulation. Although, with very few exceptions, the previous models in the literature …
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