Sökning: "Diffusion model"

Visar resultat 1 - 5 av 732 avhandlingar innehållade orden Diffusion model.

  1. 1. Diffusion in Bone Tissue

    Detta är en avhandling från Solid Mechanics, Faculty of Engineering, Lund University

    Författare :Gustav Lindberg; [2013-11]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bone growth; diffusion; stress enhanced; finite element method; steady-state; periosteal membrane; diffusion in bovine bone; diffusion experiment; Conductivity measurement; Fick’s law; Fourier series; Kalman filter; transient solution;

    Sammanfattning : In order to prevent or modify the processes of bone degeneration 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. LÄS MER

  2. 2. Pushing diffusion MRI towards new dimensions

    Detta är en avhandling från Lund University, Faculty of Science, Department of Chemistry, Division of Physical Chemistry

    Författare :Joao Martins; [2020-01]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NMR; MRI; diffusion; relaxation; multidimensional diffusion MRI; relaxation-diffusion correlations; Laplace NMR; porous media; tissue microstructure; heterogeneity; anisotropy;

    Sammanfattning : Diffusion-MRI techniques allow the non-invasive investigation of microstructural changes in living tissues. However, a detailed interpretation of the data is complicated by the fact that multiple microscopic environments with varying diffusion properties all contribute to the measured signal. LÄS MER

  3. 3. CALIBRATION OF CHROMATOGRAPHY MODELS

    Detta är en avhandling från Inst för Kemiteknik, Kemicentrum, Lunds Universitet

    Författare :Patrik Persson; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; film mass transfer resistance; Kemiteknik och kemisk teknologi; sorption kinetics; external volume; monolithic bed; shallow bed; packed bed; capillary model; detailed model; computer simulation; parameter estimation; diffusion; model calibration; Chromatography; modelling; proteins; Chemical technology and engineering;

    Sammanfattning : AbstractThis thesis is devoted to calibration of mathematical chromatography models. Chromatography models include unknown parameters that must be determined before the models can be applied to optimization or scale-up of a chromatography process. LÄS MER

  4. 4. Predictive Modeling of Lake Eutrophication

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Jan Mikael Malmaeus; Lars Håkanson; Kurt Pettersson; Jürg Bloesch; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; mass balance model; dynamic model; mechanistic model; phosphorus; LEEDS; suspended particulate matter; settling velocity; sedimentation; accumulation sediments; burial; diffusion; climate scenario; Erken; Balaton; Kinneret; Batorino; Miastro; Naroch; Galten; Ekoln; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap;

    Sammanfattning : This thesis presents predictive models for important variables concerning eutrophication effects in lakes. The keystone is a dynamic phosphorus model based on ordinary differential equations. LÄS MER

  5. 5. On the determination of diffusion coefficients in bone

    Detta är en avhandling från Division of solid mechanics, Lund University

    Författare :Abdallah Shokry; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kalman filter; Mathematical model; Spatially dependent diffusion; Diffusion in bone; Diffusion coefficient; Conductivity; Elastic modulus; Porous materials;

    Sammanfattning : Diffusion in bone is needed for bone remodeling and bone healing. Understanding the phenomenon is often important for comprehension bone diseases. Mathematical modeling of the diffusion processes is a required prerequisite in the study of this important physical process in living bone tissue. LÄS MER