Sökning: "niklas wikström"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden niklas wikström.

  1. 1. Approaching Large Eddy Simulation of Cavitating Flows for Marine Applications

    Författare :Niklas Wikström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VOF; OpenFOAM; CFD; LES; Navier-Stokes; incompressible free surface flow; Cavitation;

    Sammanfattning : Cavitation is a major concern in naval craft design as well as in the shipping industry. Although the nature of cavitation is not fully understood, propellerdesigns are presently improved by experimental analysis of the phenomena. LÄS MER

  3. 2. Evolution of Lycopodiaceae (Lycopsida) : Relationships and Patterns of Diversification

    Författare :Niklas Wikström; Anders Tehler; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; systematisk botanik; Systematic Botany;

    Sammanfattning : A series of phylogenetic analyses using nucleotide sequence data resolves many aspects of the relationships in a group of land plants that until now have received comparatively little attention, the homosporous lycopsids or Lycopodiaceae. Although the group has evolved as an isolated lineage ever since the Late Devonian (more than 470 Myr ago), little is known about how modern species diversity relate to this ancient history. LÄS MER

  4. 3. Reticulate Evolution in Diphasiastrum (Lycopodiaceae)

    Författare :Sunniva Margrethe Due Aagaard; Niklas Wikström; Tom A. Ranker; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; admixture analysis; Bayesian clustering; Diphasiastrum; Feulgen DNA image densitometry; homoploid hybridization; Lycopodiaceae; phylogenetic analysis; polyploidy; reticulate evolution; Systematics and phylogenetics; Systematik och fylogeni; systematisk botanik; Systematic Botany;

    Sammanfattning : In this thesis relationships and the occurrence of reticulate evolutionary events in the club moss genus Diphasiastrum are investigated. Diphasiastrum is initially established as a monophyletic group within Lycopodiaceae using non recombinant chloroplast sequence data. LÄS MER

  5. 4. Spatial interaction and local government expenditures for functionally impaired in Sweden

    Författare :Lena Birkelöf; Magnus Wikström; Niklas Hanes; Hendrik Folmer; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Local public expenditures; Spatial econometrics; Spatial interaction; Intergovernmental grants; Expenditure crowding out; Functionally impaired.; Economics; Nationalekonomi; Economics; nationalekonomi;

    Sammanfattning : The thesis consists of an introductory part and three self-contained papers. Paper [I] studies the determinants of the differences in expenditure on services for functionally impaired individuals among municipalities in Sweden. LÄS MER

  7. 5. Economic policy in health care : Sickness absence and pharmaceutical costs

    Författare :David Granlund; Magnus Wikström; Niklas Rudholm; Åke G Blomquist; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; vertical fiscal externalities; sickness absence; sickness benefits; health care expenditure; fixed budgets; pharmaceuticals; cost containment; dynamic panel data models; endogeneity; propensity score matching; Economics; Nationalekonomi;

    Sammanfattning : This thesis consists of a summary and four papers. The first two concerns health care and sickness absence, and the last two pharmaceutical costs and prices. Paper [I] presents an economic federation model which resembles the situation in, for example, Sweden. LÄS MER