Sökning: "Ab initio"

Visar resultat 1 - 5 av 252 avhandlingar innehållade orden Ab initio.

  1. 1. Ab initio Lattice Dynamics Hydrogen-dense and Other Materials

    Detta är en avhandling från Uppsala : Universitetsbiblioteket

    Författare :Duck Young Kim; Uppsala universitet.; [2009]
    Nyckelord :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; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : 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. LÄS MER

  2. 2. Molecular Electronics Insight from Ab-Initio Transport Simulations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Jariyanee Prasongkit; Uppsala universitet.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular Electronics; Ab Initio; DNA Sequencing; Nanoscience; Graphene; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : This thesis presents the theoretical studies of electronic transport in molecular electronic devices. Such devices have been proposed and investigated as a promising new approach that complements conventional silicon-based electronics. LÄS MER

  3. 3. Defects and Impurities in CdTe An ab Initio Study

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anna Lindström; Uppsala universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Native defects; Compensation mechanisms; Semiconductor doping; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : In this thesis defects and impurities in CdTe have been studied with ab initio methods. CdTe is a II-VI semiconductor with many important applications such as γ- and X-ray detectors, solar cells and medical imaging. LÄS MER

  4. 4. Ab initio modelling of alkali-ion battery electrolyte properties

    Detta är en avhandling från Chalmers University of Technology

    Författare :Erlendur Jónsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Batteries; electrolytes; lithium salts; sodium salts; anions; ab initio; DFT;

    Sammanfattning : Lithium-ion batteries are omnipresent in modern electronics. They can be found in laptops, mobile phones and electric vehicles. LÄS MER

  5. 5. Electronic structure and exchange interactions from ab initio theory New perspectives and implementations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Ramon Cardias Alves de Almeida; Uppsala universitet.; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ab initio; exchange interactions; non-collinear magnetism; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : In this thesis, the magnetic properties of several materials were investigated using first principle calculations. The ab initio method named real space linear muffin-tin orbitals atomic sphere approximation (RS-LMTO-ASA) was used to calculate the electronic structure and magnetic properties of bulk systems, surface and nanostructures adsorbed on surfaces. LÄS MER