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 15 of 15 for “"Lotka-Volterra model"”.
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Identification and incorporation of quantitative indicators of ecosystem function into single-species fishery stock assessment models and the associated biological reference points
… trawl fishery, and to utilize a multispecies Lotka-Volterra model to examine possible community level effects of fishing. Community level effects include predator-prey interactions and the responses of fish in the same community to fishing pressure. The summer and fall Southeast Area …
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Stable configurations for population and social dynamics
… 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. Results such …
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Pitchfork bifurcations of invariant manifolds
… to a 2-dimensional discrete version of the Lotka-Volterra model, describing dynamics of a predator-prey population. The Lotka-Volterra model is slightly modified to depend on a continuously varying parameter. Significance of a pitchfork bifurcation in the Lotka-Volterra model is discussed …
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On the Relaxation Dynamics of Disordered Systems
… systems: the two-species predator-prey Lotka-Volterra model with rate variability, and an elastic line model to simulate vortex lines in type-II superconductors. We study the effects of intrinsic demographic variability with inheritance in the reaction rates of the Lotka-Volterra model …
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Understanding community changes in ecological systems: a probabilistic and geometric perspective
… This framework, rooted in the generalized Lotka-Volterra model, adopts a probabilistic and geometric perspective to understand these dynamics. In particular, my thesis comprises three core projects. The first project develops probabilistic system-level measures to quantify the effects of …
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Nonlinear oscillation and control in the BZ chemical reaction.
In this thesis, a reversible Lotka-Volterra model was proposed to study the nonlinear oscillation of the Belousov-Zhabotinsky(BZ) reaction in a closed isothermal chemical system. The reaction zone can be divided into two zones, oscillation zone and transition zone, where the oscillation time and …
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The Spread of Change in French Negation
… progression observed by Kroch (1989). Following Lotka (1925) and Volterra (1926), we can extend this model to take into account the competition between constructions to express the same function. To test these models, I have compiled a corpus of French theatrical texts from the twelfth to the …
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Algorithms for Reconstructing Biological History from Genomic Data
… The second half of the thesis concerns models for the microbiome and practical algorithms that emphasize scalability and interpretability. We present work on strain tracking, in which one is asked to reconstruct a time-series profile of bacterial strain ratios from shotgun-sequenced …
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Travelling waves in Lotka-Volterra competition models
… multi-stable reaction-diffusion systems used to model competing species. Systems in this class possess uniform stable steady states representing semi-trivial solutions. We start by considering a bistable, interaction, where the interactions are of classic “Lotka-Volterra” type and we consider a …
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Interaction strengths and net effects in food web models
… that can be used to inform and test predictive models, which means that much of our knowledge regarding the response of ecological communities to perturbations is obtained from theoretical analyses and simulations. This thesis is composed of two strands of research: an empirical experiment …
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I. Kinetic Modeling of Surface Reactions II. Computational Design of Organic Semiconductors
… moment closures. Using the lattice Lotka-Volterra model (LLVM) as a model system, we trained feedforward neural networks (FFNNs) on kinetic Monte Carlo (KMC) results at select values of rate constants and initial conditions. The ML moment closure (MLMC) gave drastic improvements in …
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Population dynamics of stochastic lattice Lotka-Volterra models
In a stochastic Lotka-Volterra model on a two-dimensional square lattice with periodic boundary conditions and subject to occupation restrictions, there exists an extinction threshold for the predator population that separates a stable active two-species coexistence phase from an inactive state …
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Aspects of population dynamics
… dynamical behavior. Ecological systems can be modeled through relatively simple population dynamics models. There is a plethora of models describing deterministic models of ecological systems evolving in a constant environment. However, stochasticity can lead to extinction or fixation events, …
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Software defined radio : a system engineering view of platform architecture and market diffusion
… are being forced toward new organizational models. New products require integrating knowledge across technologies, architectures, and functions in new ways, building product platforms that can adapt to changes in markets and product design throughout the product development process. In …
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Il dilemma Cooperazione vs Competizione in applicazioni economiche e ecologiche
… is devoted to the discussion of mathematical models for the study of cooperation and competition, from Game Theory to dynamic systems models. The two systems analyzed are very different in nature, but their study still falls within the framework of complex systems, to which is dedicated the …