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 7 of 7 for “"delay differential equation"”.
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A Numerical Study of a Delay Differential Equation Model for Breast Cancer
… of certain drug therapies on the cancer. We use delay differential equations to model the interaction of breast cancer cells with the immune system. The new model is constructed by combining two previous models. The first model accounts for different cell cycles and includes terms to evaluate …
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A Stochastic Delay Model for Pricing Corporate Liabilities
… price of a firm follows a nonlinear stochastic delay differential equation. We also assume that any claim whose value depends on firm value and time follows a nonlinear stochastic delay differential equation. Using self-financed strategy and replication we are able to derive a random partial …
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Complex dynamics of a microwave time-delayed feedback loop
… 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 third-order to produce chaos, even a …
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Machine tool chatter suppression using spindle speed variation
… with the dynamics and stability of nonlinear delay gyroscopic systems with periodically varying delay. The aim is to demonstrate that greater depths of cut may be achieved in a boring process (2 DOF) when the speed of the spindle is modulated sinusoidally instead of being kept constant. Since …
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Business Cycle Models with Embodied Technological Change and Poisson Shocks
… solution is presented. In the general case a delay differential equation (DDE) has to be solved. Standard numerical solution methods fail, because the steady state is path dependent. A new solution method is presented which is based on a modified method of steps for DDEs. It provides not only …
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Modelling the Impact of Climate Change on the Polar Bear Population in Western Hudson Bay
… 6. The second model is a system of continuous delay differential equations with time-dependent parameters, also influenced by increasing temperatures. The positivity of solutions is found, dependent on sufficient initial conditions. Numerical simulations predicted a threshold value for the …
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Nonlinear Dynamics and Chaos in Systems with Time-Varying Delay
Systeme mit Zeitverzögerung sind dadurch charakterisiert, dass deren zukünftige Entwicklung durch den Zustand zum aktuellen Zeitpunkt nicht eindeutig festgelegt ist. Die Historie des Zustands muss in einem Zeitraum bekannt sein, dessen Länge Totzeit genannt wird und die Gedächtnislänge festlegt. In …