Search for dissertations about: "Fokker-Planck"

Showing result 16 - 20 of 28 swedish dissertations containing the word Fokker-Planck.

  2. 16. Statistical Aspects of Diffusion in Turbulent Plasmas

    Author : Igor Holod; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbulent diffusion; fluctuations; fluid closure; Fokker-Plack equation; non-Markovian effects;

    Abstract : In this work we address the closure issue in kinetic and fluid descriptions of turbulent plasmas. In fluid description contribution has been made to the nonlinear closure by Mattor and Parker [Phys. Rev. Lett. READ MORE

  4. 17. Estimation and Model Validation of Diffusion Processes

    Author : Erik Lindström; Finansiell matematik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Estimation and Model Validation of Diffusion Processes Abstract The main motivation for this thesis is the need for estimation and model validation of diffusion processes, i.e. stochastic processes satisfying a stochastic differential equation driven by Brownian motion. READ MORE

  5. 18. Ion cyclotron resonance heating and current drive in tokamaks

    Author : Johan Carlsson; KTH; []
    Keywords : ;

    Abstract : In this thesis numerical studies, performed with theMonte-Carlo code FIDO of the evolution of the resonant-iondistribution function in the presence of ion cyclotronresonance heating (ICRH) in toroidal geometry are presented. Inparticular it is pointed out how the absorption of toroidalmomentum from a wave field with finite parallel wave numberscauses spatial drift and diffusion, which together with thefinite orbit widths of the tail ions is shown to have a largeeffect on the temperature profile of the resonant ion speciesand also to cause losses of high-energy ions to the wall. READ MORE

  6. 19. Numerical solution of the Fokker–Planck approximation of the chemical master equation

    Author : Paul Sjöberg; Per Lötstedt; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Scientific Computing; Beräkningsvetenskap;

    Abstract : The chemical master equation (CME) describes the probability for the discrete molecular copy numbers that define the state of a chemical system. Each molecular species in the chemical model adds a dimension to the state space. READ MORE

  7. 20. Studies of distributions in physics using maximum entropy and scaling methods

    Author : Lotten Hägg; Uppsala universitet; []
    Keywords : Maximum Entropy; Scaling Methods; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : The maximum entropy method (MEM) is applied in the analysis of equilibrium systems. Some general properties of the MEM and how to choose constraints as well as moments are discussed. A numerically stable algorithm is developed and implemented. Distributions arising from physical processes are studied. READ MORE