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 79 for “"population models"”.
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Population models
… explore the interactions of the lynx and hare populations in Canada based on data retrieved by the Hudson Bay Company. The purpose of this study is to find a suitable mathematical model, namely that of a three-variable Lotka-Volterra system. Also, the paper will explore short-term infectious …
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Transient dynamics in plant population models
… short-term responses to unstable conditions in population models. Although the theoretical potential of these short-term effects to change interpretation of model behavior has been demonstrated, it is unclear whether transient analyses will be relevant or useful in management applications. This …
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Transient dynamics in plant population models
… short-term responses to unstable conditions in population models. Although the theoretical potential of these short-term effects to change interpretation of model behavior has been demonstrated, it is unclear whether transient analyses will be relevant or useful in management applications. This …
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Complex population models with coalescent simulations
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Dormancy in spatial population models in random environments
This thesis introduces spatial models for populations with dormancy in random environments. The models are formulated as continuous-time two-type branching random walks, where individuals switch between active and dormant states. We consider two scenarios: one where the switching rates are …
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A Comparison of Deterministic and Stochastic Population Models
… considers the exponential and the predator-prey population models. A comparison of the deterministic and stochastic versions of each is made. The author shows that on average a stochastic model is precisely its corresponding deterministic model. The first model considered is the exponential …
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Discreet dynamical population models : higher dimensional pioneer-climax models
There are many population models in the literature for both continuous and discrete systems. This investigation begins with a general discrete model that subsumes almost all of the discrete population models currently in use. Some results related to the existence of fixed points are proved. Before …
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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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On the Dynamic Dichotomy between Positive Equilibria and Synchronous 2-cycles in Matrix Population Models
For matrix population models with nonnegative, irreducible and primitive inherent projection matrices, the stability of the branch of positive equilibria that bifurcates from the extinction equilibrium as the dominant eigenvalue of the inherent projection matrix increases through one is determined …
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Inconsistency of Statistical Tests to Discriminate Lifetime Distributions and lines of Indistinguishabilty in Uniform Metric
… three distributions have successfully served as population models for evaluating the lifetime of product, they have different characteristics. Therefore, it is necessary to distinguish the correct model specifications in the lifetime analysis. My thesis investigates the inconsistency of the …
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The Andromeda Optical and Infrared Disk Survey
… of galaxies inform us about a galaxy’s stellar populations and interstellar medium, revealing stories of galaxy formation and evolution. How we interpret this light depends in part on our proximity to the galaxy. For nearby galaxies, detailed star formation histories can be extracted from the …
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The foraging behaviour of granivorous birds: a mechanistic perspective.
… of prey density, links resource availability to population level demographic rates. The functional response is often central to behavioural-based population models that predict the effect of environmental changes on populations based on the assumption that each individual tries to maximise its …
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Algorithmic Approaches to Nonparametric Causal Inference
… which exploit probabilistic structure in superpopulation, fixed covariate, and finite population models to facilitate nonparametric inference for a wide variety of statistics in completely randomized designs. The resampling algorithms extend the classical bootstrap paradigm by leveraging modern …
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Optimal Management Of Biological Populations
The successful management of biological populations is essential to both the world's economic and environmental wellbeing. This includes controlling invasive species and sustainably harvesting biological resources for profit. In the first chapter we consider monitoring programs for the management …
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A Toxicological Analysis of Exposure Magnitude, Duration, and Frequency and the Significance for Monitoring and Management of Episodic Pollution Events
Information on organism and population effects was then expanded through the use of toxicity and population modeling. Several toxicity models were evaluated against organism effects of single and multiple exposures and appropriate models were used to expand the analysis of organism effects to …
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Probabilistic data analysis with probabilistic programming
… This thesis introduces composable generative population models (CGPMs), a computational abstraction that extends directed graphical models and can be used to describe and compose a broad class of probabilistic data analysis techniques. Examples include hierarchical Bayesian models, …
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Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations
… affects growth of organisms and, therefore, populations. Persistent lipophilic toxicants acquired with the energy can bioaccumulate and harm individuals. Marine mammals are particularly vulnerable because of their large energy requirements, and transfer of energy and toxicants from mothers to …
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Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations
… affects growth of organisms and, therefore, populations. Persistent lipophilic toxicants acquired with the energy can bioaccumulate and harm individuals. Marine mammals are particularly vulnerable because of their large energy requirements, and transfer of energy and toxicants from mothers to …
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Chapters from modeling mortality in Hungary
… and aims to support the development of the population projection model of the Hungarian Central Statistical Office. From the Lee–Carter model family, we have selected both those used to forecast mortality in a single population, and those used to study the mortality of different populations …
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