Search for dissertations about: "quasilinear diffusion"

Showing result 1 - 5 of 8 swedish dissertations containing the words quasilinear diffusion.

  2. 1. 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. 2. Parabolic equations with low regularity

    Author : Magnus Fontes; Matematik LTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Matematik; Mathematics; Galerkin approximation.; low regularity; variational method; Hilbert transformation; fractional calculus; parabolic equations; quasilinear;

    Abstract : In this work we study a variational method for treating parabolic equations that yields new results for non-linear equations with low regularity on source and boundary data. We treat mainly strongly parabolic quasilinear equations and systems in divergence form. READ MORE

  5. 3. Numerical solution of quasilinear kinetic diffusion equations in toroidal plasmas

    Author : Lars Josef Höök; Torbjörn Hellsten; Thomas Johnson; Jukka Heikkinen; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : One of the main challenges for the realization of a working fusion power plant is an increased detailed understanding of kinetic phenomena in toroidal plasmas. The tokamak is a toroidal, magnetically confined plasma device and is currently the main line towards a power plant. READ MORE

  6. 4. Nonlinear Dynamics of Coherent and Partially Coherent Optical Waves

    Author : Tobias Hansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; soliton interaction; Wigner transform; logarithmically saturable media; Nonlinear Schrödinger equation; parabolic beams; partial coherence; quasilinear diffusion; modulational instability;

    Abstract : In optics an important nonlinear effect is manifested by the fact that the refractive index, in addition to its frequency dependence, also depends on the intensity of the light. Nonlinear effects are present within a wide range of optical applications e.g. the fast growing fields of fiber-optic communication and all-optical signal processing. READ MORE

  7. 5. The dynamics of Alfvén eigenmodes excited by energetic ions in toroidal plasmas

    Author : Emmi Tholerus; Torbjörn Hellsten; Thomas Johnson; Lars-Göran Eriksson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fusion plasma physics; tokamak; wave-particle interactions; toroidal Alfvén eigenmodes; bump-on-tail instabilities; magnetohydrodynamics; nonlinear dynamics; quasilinear dynamics; Hamiltonian mechanics; Monte Carlo method; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Experiments for the development of fusion power that are based on magnetic confinement deal with plasmas that inevitably contain energetic (non-thermal) particles. These particles come e.g. from fusion reactions or from external heating of the plasma. READ MORE