Search for dissertations about: "two dimensions"

Showing result 1 - 5 of 1145 swedish dissertations containing the words two dimensions.

  2. 1. Dimensions of validity : studies of the Swedish national tests in mathematics

    Author : Anna Lind Pantzare; Christina Wikström; Per-Erik Lyrén; Gordon Stobart; Umeå universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; national tests; validity; interrater reliability; standard setting; linking; subscores; test development; didactics of educational measurement; beteendevetenskapliga mätningar;

    Abstract : The main purpose for the Swedish national tests was from the beginning to provide exemplary assessments in a subject and support teachers when interpreting the syllabus. Today, their main purpose is to provide an important basis for teachers when grading their students. READ MORE

  4. 2. Fractal spectral measures in two dimensions

    Author : Bengt Alrud; Högskolan i Borås; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Matematik och teoretisk fysik;

    Abstract : .... READ MORE

  5. 3. A numerical study of two-fluid models for dispersed two-phase flow

    Author : Reynir Levi Gudmundsson; Björn Sjögreen; Anders Petersson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Numerical analysis; two-phase flow; two-fluid mode; well-posedness; numerical experiments; Numerisk analys; Numerical analysis; Numerisk analys;

    Abstract : In this thesis the two-fluid (Eulerian/Eulerian) formulation for dispersed two-phase flow is considered. Closure laws are needed for this type of models. We investigate both empirically based relations, which we refer to as a nongranular model, and relations obtained from kinetic theory of dense gases, which we refer to as a granular model. READ MORE

  6. 4. Characteristic properties of two-dimensional superconductors close to the phase transition in zero magnetic field

    Author : Kateryna Medvedyeva; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; superconductor; two dimensions; phase transition; vortex; currentvoltage characteristics; complex conductivity; scaling; critical exponents; XY-type models; dynamics; Physics; Fysik; fysik; Physics;

    Abstract : The main focus of this thesis lies on the critical properties of twodimensional (2D) superconductors in zero magnetic field. Simulations based on variants of the 2D XY model are shown to give characteristic features close to the phase transition which agree qualitatively with experimental data. READ MORE

  7. 5. Fermions in two dimensions and exactly solvable models

    Author : Jonas de Woul; Edwin Langmann; Fabian Essler; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bosonization; Exactly solvable models; Hubbard model; Mean field theory; Quantum field theory; Strongly correlated systems;

    Abstract : This Ph.D. thesis in mathematical physics concerns systems of interacting fermions with strong correlations. For these systems the physical properties can only be described in terms of the collective behavior of the fermions. READ MORE