Search for dissertations about: "effective diffusion coefficient"
Showing result 1 - 5 of 26 swedish dissertations containing the words effective diffusion coefficient.
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1. Modeling of Hindered Diffusion in Gels
Abstract : Hindered diffusion occurs in the most different processes, as has been described in this thesis. It is very important to have an understanding of the influence of hindered diffusion on the mass transfer rate, especially when competing rate processes are acting simultaneously. READ MORE
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2. Heterogeneous Materials - Diffusion, Laplace spectrum and NMR
Abstract : Relations to the effective diffusion constant and the relaxation rate of the time-dependent diffusion coefficient for porous systems are derived from the Laplace operator spectrum. The Padé approximation is then explained in terms of the Laplace operator spectrum. READ MORE
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3. Diffusion of large molecules in steam-exploded wood
Abstract : The diffusion of large molecules in wood pre-treated with steam explosion is important to understand in the context of the materials biorefinery. Steam explosion is a pretreatment method used to both open up the internal structure of wood and increase the accessibility of the cell walls of the wood with the use of high-pressure steam, and it is considered an energy-efficient method. READ MORE
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4. Heterogeneous Materials - Diffusion, Laplace Spectrum, and Nuclear Magnetic Resonance
Abstract : In this thesis diffusion in heterogeneous materials is studied using spectral analysisof the Laplace operator. Relations to the effective diffusion constant and therelaxation rate of the time-dependent diffusion coefficient for porous systems arederived from the Laplace operator’s spectrum. READ MORE
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5. On the Growth of Bone through Stress Driven Diffusion and Bone Generation Processes
Abstract : In order to prevent or modify bone degeneration due to rest or due to diseases such as osteopenia and osteoporosis, the modeling and remodeling of bone tissue must be better understood. In this thesis it is assumed that the primary condition leading to bone growth is a change of the chemical environment caused by transport of matter resulting from stress driven diffusion. READ MORE