Sökning: "Random walk"

Visar resultat 6 - 10 av 64 avhandlingar innehållade orden Random walk.

  1. 6. Random walk boundaries: their entropies and connections with Hecke pairs

    Författare :Hanna Oppelmayer; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Poisson boundary; Hecke pairs; Non-singular dynamical systems; Schlichting completion; random walks on groups; non-monotone sequences of $ sigma$-algebras; Furstenberg entropy;

    Sammanfattning : We present three papers in non-singular dynamics concerning boundaries of random walks on locally compact, second countable groups. One common theme is entropy. Paper II and III are concerned with boundary entropy spectra, while Paper I studies topological properties of entropy. LÄS MER

  3. 7. Nuclear fission and fusion in a random-walk model

    Författare :Martin Albertsson; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fission; Brownian shape motion; energy partition; neutron multiplicity; kinetic energy; fusion; superheavy elements; quasifission; Fysicumarkivet A:2021:Albertsson;

    Sammanfattning : This dissertation deals with theoretical descriptions of nuclear fission and synthesis of superheavy elements via fusion. The associated shape evolutions are treated using a random-walk approach where both the potential energy and the nuclear level density influence the dynamics. LÄS MER

  4. 8. My first-passage : target search in physics and biology

    Författare :Markus Nyberg; Ludvig Lizana; Martin Rosvall; Carlos Mejia-Monasterio; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; first-passage; mean first-passage time; mean first-arrival time; random walk; diffusion; zero-crossing; persistence; survival probability; network; resetting; teoretisk fysik; Theoretical Physics;

    Sammanfattning : Random walks and diffusing particles have been a corner stone in modelling the random motion of a varying quantity with applications spanning over many research fields. And in most of the applications one can ask a question related to when something happened for the first time. That is, a first-passage problem. LÄS MER

  5. 9. Internal oxidation processing : New alloys and new simulation techniques

    Författare :Henrik Larsson; KTH; []
    Nyckelord :Internal oxidation; nitriding; diffusion; simulation; random walk; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Nitriding and oxidising treatments of alloys for toolingpurposes have been investigated both experimentally andtheoretically. Specimens prepared by a combination of differentprocessing steps are investigated by light-optical, scanningand transmission electron microscopy and hardness measurments. LÄS MER

  7. 10. Harmonic measures

    Författare :Jonatan Vasilis; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; harmonic measure; square root of the Poisson kernel; Hardy space; p-Laplace operator; random walk; regular tree; discrete minimal thinness; Hardy space;

    Sammanfattning : This thesis uses both analytic and probabilistic methods to study continuous and discrete problems. The main areas of study are the asymptotic properties of p-harmonic measure, and various aspects of the square root of the Poisson kernel. Fix a domain and a boundary point, subject to certain regularity conditions. LÄS MER