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 87 for “"population model"”.
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A unified population model of Calanus finmarchicus and C. helgolandicus in the North Atlantic
… in the literature. Second, we produce a unified population model of both species across the North Atlantic, which relates differences in geographic distribution to inter-species differences in biology. This model is then used to highlight the limits of current understanding of mortality, and of …
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Discrete and dynamic population models with logistic growth rate
… defines a discrete relation describing a population model. Considering periodic carrying capacity and periodic inherent growth rate, a population with seasonal changing life cycle and environment is reflected. The so-called periodically forced Beverton-Holt equation is investigated and its …
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Norway lobster and Hematodinium sp. in the Clyde, modelling the population dynamics of a commercially important host-parasite system
… the development of a Nephrops-Hematodinium population model which simulates the coupled dynamics of Nephrops and Hematodinium in the Clyde Sea Area.;This includes a representation of harvesting by fisheries. The model involves a dynamic energy budget approach to modelling the moult cycle of …
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Probabilistic Models For Population Dynamics
… particle systems that serve as probabilistic models for population dynamics are studied in this work. The quadratic contact process is a stochastic spatial model for a population in which each individual has two parents and the dynamics are governed by random birth and death rates and an …
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Modeling the Impact Of Environmental Factors, Diapause and Control Strategies on Tick and Tick-Borne Disease Dynamics
… and have increasingly affected the Canadian population through a variety of tick-borne diseases including Lyme disease. In order to address this problem, the Public Health Agency of Canada has dedicated an entire section of its website to discuss the risks and the possibility of preventing, …
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Combined correlation induction strategies for designed simulation experiments
… the estimation of the mean response in a single population model. We explore how these methods may reduce the variance of the estimator of interest. A combined method (Combined Method 1) using antithetic variates for the non-control variate stochastic components and independent streams for the …
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Analysis of discrete dynamical system models for competing species
… (LV) differential equations for competing population species is analyzed in detail, much the same way as the discrete form of the logistic equation has been investigated as a source of bifurcation phenomena and chaotic dynamics. Another related system, namely, the Exponentially Self …
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A model for Arctic Charr populations in Cambridge Bay considering fluctuating environment
… age- and stage-structured discrete-time matrix population model to describe the behaviour of an Arctic Charr population. Given the properties of the model, a weak ergodic behaviour is expected in the long run. Then, utilizing data collected in Cambridge Bay and using a generalized weighted least …
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Modeling Environmental Effects on MSX Prevalence and Intensity in Eastern Oyster (<i>Crassostrea virginica</i>) Populations
<p>An oyster population model coupled with a model for Haplosporidium nelsoni, the causative agent of the oyster disease MSX, was used with salinity time-series constructed from Delaware River flow measurements to study environmentally-induced variations in the annual cycle of this disease. …
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Mathematical and computational approaches to contagion dynamics on networks
… basics of graph/network theory, epidemiological models (both well mixed and on networks), and mobility models (the gravity and radiation models). After the introduction of these topics, we propose a general framework for epidemiological network models from which the known individual-based and …
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Weed seed survival in an agriculturally-based anaerobic digester
… viability. By applying the Schafer-Chilcote seed population model, it was observed that the fermentation process was more effective in destroying non-dormant seeds than dormant seeds.
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Evaluating the Effectiveness of Population Reconstruction for Black Bear (Ursus americanus) and White-Tailed Deer (Odocoileus virginianus) Population Management
This study was a comprehensive evaluation of population reconstruction techniques. Population reconstruction techniques are population estimation methods that calculate a minimum population size based on age-specific harvest data (Downing 1980, Roseberry and Woolf 1991). Population reconstruction …
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Direct visualization of cold denaturation of cytochrome-C Using Small Angle X-Ray Scattering
… folding theory using by using a two‐state population model to relate thermodynamic quantities to physical measurements. The incorporation of a temperature‐dependent pH and solvent dielectric constant is critical to incorporating the electrostatic interactions of both the protein and the …
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Application of population pharmacokinetic-pharmacodynamic modelling evaluate and optimise aminoglycoside therapy in patients with cystic fibrosis
… regimens. The focus of this thesis was to use population pharmacokinetic methodologies to examine how aminoglycoside pharmacokinetic parameters change over time in this group of patients and to develop and evaluate dosing regimens and data interpretation methods. A population pharmacokinetic …
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Maintaining pathogens with short infectivity in seasonally structured tick populations: relative importance of three transmission pathways
… affects how the pathogens are maintained in tick populations. In addition to systemic and vertical transmission, cofeeding transmission has been proposed as an important route for the persistence of pathogens with short infectivity (e.g., tick-borne encephalitis causing viruses, TBEv). Because …
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A study of a random-mating population of fixed size
… is devoted to a study of absorption in a genetic population model and the second part to introducing a new method of matrix inversion. The author begins Part I by presenting the haploid population model under consideration, a constant-size population in which mutation is absent. Using the approach …
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Structure-function relationship in hierarchical model of brain networks
… network of cat cortical connectivity. We model the cortical areas by a subnetwork of interacting excitable neurons (multilevel model) and by a neural mass model (population model). With weak couplings, the multilevel model displays biologically plausible dynamics and the synchronization …
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The simulation of surface ship micro-bubble wakes
… which the transport and evolution of the bubble population in a surface ship wake is numerically simulated is presented. The simulation is accomplished by constructing an advective-diffusive transport model for the scalar bubble field and solving this model for late times after ship passage. The …
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Modelling the star formation histories of nearby elliptical galaxies
… of observational data against which computer models of galaxy evolution have been compared. However, as this thesis demonstrates, observed Lick indices lead to mathematical ill-conditioning: small variations in observations can lead to very large differences in population synthesis models …
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