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Showing result 1 - 5 of 20 swedish dissertations matching the above criteria.

  1. 1. Hopf Invariants in Real and Rational Homotopy Theory

    University dissertation from Stockholm : Department of Mathematics, Stockholm University

    Author : Felix Wierstra; Alexander Berglund; Urtzi Buijs; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Rational homotopy theory; Real homotopy theory; operads; Hopf invariants; matematik; Mathematics;

    Abstract : In this thesis we use the theory of algebraic operads to define a complete invariant of real and rational homotopy classes of maps of topological spaces and manifolds. More precisely let f,g : M -> N be two smooth maps between manifolds M and N. READ MORE

  2. 2. Hopf and Frobenius algebras in conformal field theory

    University dissertation from Karlstad : Karlstad University Press

    Author : Carl Stigner; Jürgen Fuchs; Jens Fjelstad; Ingo Runkel; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; conformal field theory; category theory; Hopf algebra; Frobenius algebra; coends; mapping class group; defect lines; factorization constraints; Physics; Fysik;

    Abstract : There are several reasons to be interested in conformal field theories in two dimensions. Apart from arising in various physical applications, ranging from statistical mechanics to string theory, conformal field theory is a class of quantum field theories that is interesting on its own. First of all there is a large amount of symmetries. READ MORE

  3. 3. Irreducible Representations of Quantum Affine Algebras

    University dissertation from Karlstad : Karlstad University Press

    Author : Jesper Thorén; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Number Theory; Matematik; Mathematics; quantum evaluation modules; highest weight representations; quantum Yang-Baxter equation; quantum affine algebras; quantum groups; comultiplication; Hopf algebras; affine Lie algebras; field theory; algebraic geometry; algebra; group theory; Talteori; fältteori; algebraisk geometri; gruppteori;

    Abstract : We construct finite-dimensional representations of the quantum affine algebra associated to the simple finite-dimensional Lie algebra sl(n+1). The module structure is defined on the vector space tensor product of the fundamental representations of the quantum affine algebra. READ MORE

  4. 4. Heat loss to the ground from a building : slab on the ground and cellar

    University dissertation from Byggnadsfysik LTH, Lunds Tekniska Högskola

    Author : Carl-Eric Hagentoft; [1988]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Heat loss; heat transfer in the ground; thermal analysis; slab; cellar; crawl-space;

    Abstract : Heated buildings induce a heat flow from the building foundation into the ground. The topic of this thesis is the thermal process in the ground and, in particular, the heat losses from the building to the ground. Foundations of the three types slab on the ground, cellar, and crawl-space are dealt with. The crawl-space is treated in separate report. READ MORE

  5. 5. Elastic Wave Scattering by Cracks - Interfacial Forces and High Frequency Diffraction

    University dissertation from Byggnadsfysik LTH, Lunds Tekniska Högskola

    Author : Gert Persson; [1992]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ultrasonic testing; Wiener-Hopf calculations; Geometrical Theory of Diffraction; edge diffracted body waves; PEDGE; two-dimensional diffraction; geometrical elastodynamic waves;

    Abstract : This thesis treats elastic wave scattering by cracks with interfacial forces. The results are of practical interest in ultrasonic testing and includes development of numerical methods used to predict such testing. First the canonical problem of two-dimensional (2-D) diffraction from a semi-infinite crack is solved. READ MORE