Search for dissertations about: "lattice energy"

Showing result 1 - 5 of 284 swedish dissertations containing the words lattice energy.

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

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

    Abstract : 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). READ MORE

  4. 2. Studies for the Low Emittance MAX-IV Storage Rings

    Author : Hamed Tarawneh; Lunds universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics; Touschek losses; energy acceptance; dynamic aperture; Lattice; emittance;

    Abstract : This thesis discusses the feasibility of a low emittance lattice proposed for the MAX-IV storage rings. The MAX-IV facility will have two storage rings that are identical but operated at two different energies, 1.5 GeV for soft X-ray and 3 GeV for hard X-ray production. READ MORE

  5. 3. Ab initio Lattice Dynamics : Hydrogen-dense and Other Materials

    Author : Duck Young Kim; Rajeev Ahuja; Richard Needs; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Density functional theory; Density functional perturbation theory; Hydrogen-dense materials; Phase transition; High pressure; Ab initio lattice dynamics; Superconductivity; Quasi-particle approximation; Physics; Fysik;

    Abstract : This thesis presents a theoretical study of materials under high pressure using ab initio lattice dynamics based on density functional theory and density functional perturbation theory using both super-cell and linear response approach. Ab initio lattice dynamics using super-cell approach is applied to compare our theoretical predictions with experimental findings. READ MORE

  6. 4. Theoretical studies of lattice- and spin-polarons

    Author : Nina Bondarenko; Olle Eriksson; Natalia Skorodumova; Manuel Pereiro; Maria Roser Valenti Vall; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polaron; Nonlinear Schrödinger Equation; Nonlocality; Solitons; Integrable systems; Quantum field theory low energy ; Electron-phonon interaction; Density functional theory; Electronic structure of atoms and molecules; Spin-polaron; Langevin equation; Transport properties; Hubbard model; Heisenberg lattice; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : Theoretical studies of lattice- and spin-polarons are presented in this thesis, where the primary tool is ab-initio electronic structure calculations. The studies are performed with employment of a variety of analytical and computational methods. READ MORE

  7. 5. Lattice dynamics in perovskites for green energy applications: A theoretical perspective

    Author : Petter Rosander; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; density func- tional theory; perovskites; defects; lattice dynamics; thermodynamic modelling; force constants; oxides;

    Abstract : Electrolyzers and fuel cells are used in green energy applications, electrolyzers split water to produce hydrogen, which can then be used in fuel cells to produce energy. Oxide perovskites have shown favorable properties for applications in this area, e.g., as electrolyte and cathode material in fuel cells and electrolyzers. READ MORE