Search for dissertations about: "Tomas Jonsson"

Showing result 1 - 5 of 8 swedish dissertations containing the words Tomas Jonsson.

  2. 1. Characterization of the BOLD signal in functional MRI

    Author : Tomas Jonsson; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : In the last two decades, functional magnetic resonance imaging (fMRI) has become an important and widely used imaging technique for functional brain mapping. However, blood oxygen level dependent (BOLD) technique is quite insensitive and task invoked BOLD signal change at 3T is typically in the order of a few percent. READ MORE

  4. 2. Collective behavior of disordered magnetic systems

    Author : Tomas Jonsson; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; Solid State Physics; fasta tillståndets fysik;

    Abstract : Magnetic properties of disordered and frustrated magnets have been experimentally investigated. The magnetic systems in focus in this work are spin-glasses and frozen ferrofluids (suspensions of nano-sized magnetic particles). READ MORE

  5. 3. Food webs and the distribution of body sizes

    Author : Tomas Jonsson; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Many ecologically relevant life-history traits of organisms, (such as generation time and ingestion rate) are significantly correlated to body size. Since these individual and species characteristics can affect the interactions between the species in a community, it is possible that the distribution of body sizes (in communities) can affect different properties of foodwebs as well. READ MORE

  6. 4. Two Problems in non-linear PDE’s with Phase Transitions

    Author : Karl Jonsson; Henrik Shahgholian; Tomas Sjödin; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Conductivity jump; Free boundary problem; Quasilinear elliptic equation; Mathematical techniques; Nonlinear analysis; Free boundary; Free-boundary problems; Quasi-linear elliptic; Quasilinear elliptic equations; Hele-Shaw flow; non-local; implicit function theorem; Heterogeneous Multi Scale; HMM; Finite Element; FEM; FE; Mathematics; Matematik;

    Abstract : This thesis is in the field of non-linear partial differential equations (PDE), focusing on problems which show some type of phase-transition. A single phase Hele-Shaw flow models a Newtoninan fluid which is being injected in the space between two narrowly separated parallel planes. READ MORE

  7. 5. The decline of great Arctic charr in Lake Vättern : empirical and theoretical analyses of suggested causes

    Author : Malin Setzer; Tomas Jonsson; Bo Ebenman; Mark C. Emmerson; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Naturvetenskap;

    Abstract : Human activity is affecting species and ecosystems all over the world. In aquatic systems negative trends can be seen for many fish stocks and potential consequences of this, for ecosystem structure and functions, are of particular concern. READ MORE