Sökning: "Department of Physics Uppsala University"
Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Department of Physics Uppsala University.
1. Computational studies of core level XPS satellites in transition metal systems : Department of Quantum Chemistry, Uppsala University
Sammanfattning : Upon core ionization of a free molecule or a molecule adsorbed on a metal surface, higher binding energy satellites are observed, so called "shake-up" satellites, which can be viewed as valence excitations simultaneously to the creation of the core hole. In this thesis, theoretical studies of such core level XPS satellites in transition metal systems are presented, as well as cluster calculations of XES spectra, using the quantum mechanical INDO method. LÄS MER
2. Shake-up studies of model systems for adsorbates : Department of Quantum Chemistry, Uppsala University
Sammanfattning : Shake-up studies of model systems for adsorbates are presented. The molecule CO adsorbed on transition metal surfaces belong to one of the most studied systems in surface science. The interest is motivated by fundamental questions about the adsorbate-substrate interaction as well as technical applications, such as catalysis. LÄS MER
3. Calculation and Measurement of the Neutron Emission Spectrum due to Thermonuclear and Higher-Order Reactions in Tokamak Plasmas
Sammanfattning : A series of analytic and numerical models have been developed for the prediction and interpretation of the energy spectrum of the neutron emission from thermonuclear deuteriumtritium (DT) plasmas. The main component of the neutron emission, due to reactions between thermal fuel ions, has been modeled as well as minority components due to the presence of fast (supra-thermal) ions. LÄS MER
4. Preparation and Characterisation of Sputtered Titanium- and Zirconium Nitride Optical Films
Sammanfattning : Multilayered interference coatings based on titanium- and zirconium nitride and designed for solar control have been prepared using reactive d c magnetron sputtering. Preparation effects and degradation mechanisms were investigated. It was shown that the quality of the nitride strongly depends on the degree of crystallinity in the underlying oxide. LÄS MER
5. Improving Training of Deep Learning for Biomedical Image Analysis and Computational Physics
Sammanfattning : The previous decade has seen breakthroughs in image analysis and computer vision, mainly due to machine learning methods known as deep learning. These methods have since spread to other fields. This thesis aims to survey the progress, highlight problems related to data and computations, and show techniques to mitigate them. LÄS MER
