Sökning: "GWA"
Hittade 4 uppsatser innehållade ordet GWA.
1. COMPARATIVE ANALYSIS OF WIND ATLASES: WIND RESOURCE ASSESSMENT OF FORESTED SITES FOR WIND POWER DEVELOPMENT
Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaperSammanfattning : Wind atlases are interactive databases used extensively for preliminary wind resource assessment aimed at optimal wind power development. The selection and processing of wind atlas data are important and will determine the quality of the subsequent WRA (Wind Resource Assessment) phases. LÄS MER
2. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States
Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionenSammanfattning : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. LÄS MER
3. The self-screening correction to RPA and GW – A model and ab initio study
Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionenSammanfattning : The self-screening error in the GW approximation is studied by applying correction schemes beyond the random-phase approximation in model and ab inito calculations. Two model systems in the form of Hubbard dimers, with one and two orbitals per site respectively, are considered. LÄS MER
4. Combining the GW Approximation with the Hubbard I Approximation for strongly correlated materials
Magister-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionenSammanfattning : In this thesis, the GW approximation (GWA, Green's function G times screened interaction W) and the Hubbard I approximation (HIA) are combined in a non-self-consistent one-shot calculation to determine the electronic structure of a one-dimensional strongly-correlated model. The scheme was chosen to incorporate both screening effects through the GWA and strong on-site correlations through the atomic HIA. LÄS MER