Sökning: "Boltzmann equation"

Visar resultat 11 - 15 av 38 avhandlingar innehållade orden Boltzmann equation.

  1. 11. Radiation and matter: how do they play with each other?

    Författare :Davide Mancusi; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; heavy ions; models; transport codes; Boltzmann equation; Monte Carlo; radioprotection in space; radiotherapy; nuclear reactions;

    Sammanfattning : The propagation of radiation is affected by the presence of matter; at the same time, the physicochemical properties of matter are modified by the passage of radiation. The interplay of radiation and matter is of crucial importance in many modern applications: accelerated heavy ions, in particular, can be used in radiotherapeutical treatments of some cancers; moreover, they are present in the space radiation environment and represent a serious threat to the health of spaceship crews and to the functionality of electronic equipment on board. LÄS MER

  3. 12. Strong L1 convergence to equilibrium without entropy conditions for the spatially homogenous Boltzmann equation

    Författare :Fredrik Abrahamsson; Jönköping University; []
    Nyckelord :;

    Sammanfattning : This paper deals with solutions to the Cauchy problem for the spatially homogeneous non-linear Boltzmann equation. The main result is that for the hard sphere kernel, a solution to the Boltzmann equation converges strongly in L1 to equilibrium given that the initial data f0 belongs to L1(R^3;(1+v^2)dv). LÄS MER

  4. 13. A regularity property and strong L1 convergence to equilibrium for the relativistic Boltzmann equation

    Författare :Håkan Andreasson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  5. 14. On Microstructural Analysis of Porous Media Existing in Fuel Cells Using the Lattice Boltzmann Method

    Författare :Mayken Espinoza Andaluz; Värmeöverföring; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Porous media; lattice Boltzmann method; microscale; Gas-phase tortuosity; Porosity; Fuel Cell;

    Sammanfattning : This Licentiate thesis aims to gain understanding related to the fluid behavior in porous media existent in fuel cells (FCs) at microscale. In order to achieve this; the widely used methodology for solving problems in porous media has been applied, the Lattice Boltzmann Method (LBM). LÄS MER

  7. 15. Electronic Transport in Materials

    Författare :Velimir Meded; Susanne Mirbt; Ingrid Mertig; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Electronic Structure; Ab initio; Condensed Matter Theory; Hydrogen; Boltzmann Transport Equation; Magnetism; Alloys; Fysik; Physics; Fysik;

    Sammanfattning : Transport properties within the Boltzmann transport equation for metallic multi-layer structures as well as bulk materials, were the prime topic of this work. Ab initio total energy calculations for Hydrogen loaded metallic multi-layers were performed in order to shed some light onto problem of H depleted layers at the interfaces that have been experimentally observed. LÄS MER