Sökning: "random cluster model"

Visar resultat 11 - 15 av 21 avhandlingar innehållade orden random cluster model.

  1. 11. Numerical studies of spin chains and cold atoms in optical lattices

    Författare :Sara Bergkvist Sylvan; Anders Rosengren; Richard Scalettar; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Teoretisk Fysik; Kondenserade materiens teori; Condensed matter physics; Kondenserade materiens fysik;

    Sammanfattning : An important, but also difficult, research field in condensed matter physics is that of strongly correlated systems. This thesis considers two topics in this field. The first topic is disorder and frustration in spin models. The introduction of disorder into quantum spin chains creates a complex problem. LÄS MER

  3. 12. Bank branches and Entrepreneurship : A spatial analysis of new firm formation in Swedish regions and industries in a changing financial landscape

    Författare :Cynthia Sin Tian Ho; Björn Berggren; Mikaela Backman; KTH; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; New firm formation; entrepreneurship; financing; bank branches; proximity; spatial analysis; GWR; Sweden; Business Studies; Företagsekonomi;

    Sammanfattning : The purpose of this thesis is to analyse how bank branch closure has affected the formation of new firms and to explore the varying local relationships between the accessibility of bank branches and new firm formation in 290 Swedish municipalities. In the first paper, the effect of bank branch closure is examined through spatial econometric analysis, in particular, the fixed effects and the random effects spatial panel models. LÄS MER

  4. 13. Superfluid Phase Transitions in Disordered Systems

    Författare :Hannes Meier; Mats Wallin Wallin; Peter Olsson; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis presents results from large scale Monte Carlo simulations of systems subject to a superfluid phase transition in the presence of disorder. The simulations are performed by state-of-the-art, collective Monte Carlo algorithms treating phase degrees of freedom in effective models with amplitude fluctuations integrated out. LÄS MER

  5. 14. Theoretical Studies of Binaries in Astrophysics

    Författare :Johann Dischler; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomi; Astronomy; Galaxy: centre; Stars: mass-loss; Binaries: close; Binaries: eclipsing;

    Sammanfattning : This thesis introduces and summarizes four papers dealing with computer simulations of astrophysical processes involving binaries. The first part gives the rational and theoretical background to these papers. In paper I and II a statistical approach to studying eclipsing binaries is described. LÄS MER

  7. 15. Incentives and Norms in Social Insurance: Applications, Identification and Inference

    Författare :Johan Vikström; Per Johansson; John Ham; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi; nationalekonomi; Economics;

    Sammanfattning : This thesis consists of five self-contained essays. Essay 1: (with Patrik Hesselius and Per Johansson) This essay tests if social work norms are important for work absence using a large scale randomised experiment. LÄS MER