Sökning: "Perturbations"

Visar resultat 1 - 5 av 345 avhandlingar innehållade ordet Perturbations.

  1. 1. On Supersingular Perturbations

    Författare :Christoph Neuner; Annemarie Luger; Rostyslav Hryniv; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; matematik; Mathematics;

    Sammanfattning : This thesis consists of four papers and deals with supersingular rank one perturbations of self-adjoint operators and their models in Hilbert or Pontryagin spaces. Here, the term supersingular describes perturbation elements that are outside the underlying space but still obey a certain regularity conditions. LÄS MER

  2. 2. Renormalization of perturbations in the spin-1/2 chain

    Författare :David Gustafsson; Chalmers University of Technology; []
    Nyckelord :non-abelian bosonization; renormalization group; perturbations; operator product expansion; Spin- 1 2 chain;

    Sammanfattning : .... LÄS MER

  3. 3. Neutronics in reactors with propagating perturbations

    Författare :Anders Jonsson; Chalmers University of Technology; []
    Nyckelord :one-group theory; Green s function; Molten Salt Reactors; two-group theory; neutron noise; propagating perturbations;

    Sammanfattning : This thesis contains several studies of the properties of neutron noise, primarily in Molten Salt Reactors and other reactors with propagating perturbations. Both one- and two-group diffusion theory are employed to investigate the differences that arise from the movement of the fuel. LÄS MER

  4. 4. Numerical computations of the unsteady flow in turbochargers

    Författare :Fredrik Hellström; Laszlo Fuchs; Ricardo Martinez-Botas; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbochargers; turbine; compressor; unsteady pulsatile flow; perturbations; Large Eddy Simulation; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : Turbocharging the internal combustion (IC) engine is a common technique to increase the power density. If turbocharging is used with the downsizing technique, the fuel consumption and pollution of green house gases can be decreased. LÄS MER

  5. 5. Perturbations of metal-ligand bonds : porphyrins and metal surfaces

    Författare :Jan Paul; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

    Sammanfattning : .... LÄS MER