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 23 for “"reaction-diffusion model"”.
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Synthesis, characterisation and engineering of thin films of ZSM-5 on alumina, quartz and sand supports
… properties of these materials by estimating the reaction-diffusion model parameters from the results of the tri-isopropylbenzene (TIPB) cracking and para-xylene (pX) isomerization probe reactions. These intrinsic model parameters are then correlated with respect to the physical analysis of the …
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Mathematical models for vector-borne disease: effects of periodic environmental variations.
Firstly, I proposed a very simple SIS/SIR model for a general vector-borne disease transmission considering constant population sizes over the season, where contact between the host and the vector responsible of the transmission is assumed to occur only during the summer of each year. I discussed …
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Modeling of controlled-release drug delivery from autocatalytically degrading polymer microspheres
A mathematical model is developed for the simultaneous treatment of PLGA degradation and erosion and diffusive drug release with autocatalytic effects and nonconstant effective diffusivity of the drug. A mechanistic reaction-diffusion model with pore evolution coupled to hydrolysis and related to …
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Diffusion in an absorbing porous medium : from microscopic geometry to macroscopic transport
Two physical models of diffusion in absorbing porous media are proposed on two length scales. One models diffusion in the pore space of a random medium with absorbing interfaces while the other is a reaction diffusion model where particles are absorbed in the bulk. Typical particle traveling …
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Spatial Dynamics and the Mechanoresponse in CD4+ T Cell Activation
… that are required to relay CD28 costimulation. A reaction-diffusion model that describes the spatial regulation of costimulation in activating human T cells is developed. The Src kinase Lck, though predominantly cytosolic, is an ideal candidate for the coupling of the TCR and CD28 pathways. …
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Applications of the Discrete Adjoint Method in Computational Fluid Dynamics
… depending on the solution of a mathematical flow model which has the form of a discretised system of partial differential equations. In this context particular emphasis is given to efficient solution strategies for the linear systems arising in the discretisation of the flow models. Numerical …
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Reaction-Diffusion Models of Cancer Dispersion
<p>The phenomenological modeling of the spatial distribution and temporal evolution of one-dimensional models of cancer dispersion are studied. The models discussed pertain primarily to the transition of a tumor from an initial neoplasm to the dormant avascular state, i.e. just prior to the …
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Quantitative modeling and control of nascent sprout geometry in in vitro Angiogenesis
… Mechanistic understanding and quantitative modeling of the dominant dynamics involved in nascent vessel growth will enable new strategies for regulating vessel growth rate and geometry, and will have implications in controlling growth of complete vascular networks in many research areas, …
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Diffusion and reaction of nitric oxide in cell cultures
… and peroxynitrite (ONOO-), formed during its reaction with molecular oxygen or superoxide anion (O2-)- It is not technically feasible to monitor the concentrations of these species under most conditions of interest, yet assessing the amounts of these species reaching target cells is essential …
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Predictive Modeling of Chemical Reactivity for Sustainability
… material and process design. However, modeling reactivity at scale remains challenging due to the computational demands of quantum chemical methods and the complexity of reaction mechanisms. This thesis explores how high-throughput computational approaches, rooted in quantum chemistry …
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Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs)
… operating away from equilibrium), a mathematical model was developed for reactive chemicals transferring between PE and sediment beds. The reaction diffusion model was used to infer in situ degradation rates of dichlorodiphenyltrichloroethane (DDT), which in the sediments of a freshwater lake were …
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Paper-based Molecular Technologies for Faster, More Accessible Infectious Disease Diagnostics
… better understand the eosin photopolymerization reaction mechanism and its diagnostic applications, a reaction-diffusion model that closely mimicked paper diagnostic assay conditions was developed based on a proposed reaction mechanism. After experimental validation, the model and experimental …
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Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs)
… operating away from equilibrium), a mathematical model was developed for reactive chemicals transferring between PE and sediment beds. The reaction diffusion model was used to infer in situ degradation rates of dichlorodiphenyltrichloroethane (DDT), which in the sediments of a freshwater lake were …
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Predicting rates and patterns of alien plant spread
… The aim of this thesis was to use succession models to develop a modelling protocol for predicting rates and patterns of alien plant spread. The rationale was that such a model would both improve our understanding of the determinants of invasions and allow us to make predictions on the rates …
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Manufacturing of glass-fiber-reinforced dicyclopentadiene-matrix composites via frontal polymerization
The student, Sagar Ketan Vyas, accepted the attached license on 2020-03-05 at 10:28.
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Modeling polymerization-based amplification
… lower than that of oxygen. A series of model simulation studies that systematically examined the effects of including additional elementary reactions based on proposed reactions in published literature into the classical free radical polymerization scheme without fitting any unknown …
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Prediction of concentrations of reactive nitrogen species in aqueous solutions and cells
… representative of inflamed tissues, a kinetic model was developed that included the effects of cellular antioxidants, amino acids, proteins, and lipids. For an NO concentration of 1 [mu]M, total peroxynitrite (Per, the sum of ONOO- and ONOOH), nitrogen dioxide (NO2), and nitrous anhydride (N20 …
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Studies of Carbon Dioxide Methanation and Related Phenomena in Porous Catalysts
… thermogravimetry. Separately a CO hydrogenation reaction, the Fischer-Tropsch process, was modelled numerically to examine the influence of mass transfer in practical, commercial pellets of catalyst. The kinetics of methanation was investigated for Ni/γ-Al2O3 over a wide range of reactant partial …
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Regulation of T-cell signaling networks
… and T-cells in particular function, using models built from basic principles in chemical engineering, statistical physics and network theory, together with experiments performed by our collaborators. The ultimate objectives are to gain an insight into the mechanisms of certain key …
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Multiscale modeling of microbial communities
… developing and applying the tools necessary to model the complex dynamics of bacterial communities. In Chapter 2, I utilize a reaction–diffusion model to determine the population dynamics for a population with two species. One species (CDI+) utilizes contact dependent inhibition to kill the …
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