Sökning: "NATURVETENSKAP Fysik"
Visar resultat 31 - 35 av 5395 avhandlingar innehållade orden NATURVETENSKAP Fysik.
31. Searches for Particle Dark Matter : Dark stars, dark galaxies, dark halos and global supersymmetric fits
Sammanfattning : The identity of dark matter is one of the key outstanding problems in both particle and astrophysics. In this thesis, I describe a number of complementary searches for particle dark matter. LÄS MER
32. Synchrotron radiation induced fluorescence spectroscopy of gas phase molecules
Sammanfattning : A new experimental set-up for gas phase fluorescence studies using synchrotron radiation has been designed and constructed to perform simultaneously total and dispersed fluorescence measurements. Neutral photodissociation of CO has been investigated after excitation with 19-26 eV photons. LÄS MER
33. Nuclear symmetry energy and neutron-proton pair correlations in microscopic mean field theory
Sammanfattning : A major task of nuclear structure theory is to develop an effective interaction that is capable to predict properties of nuclei under extreme conditions. In this thesis three different areas of effective interactions have been studied: i) the density dependence, which is of importance for the understanding of neutron stars and neutron rich nuclei; ii) the symmetry energy which governs the evolution of the binding energy with changing N/Z ratio; and iii) the neutron proton pairing energy. LÄS MER
34. Diode-pumped rare-earth-doped quasi-three-level lasers
Sammanfattning : Many rare-earth-doped materials are suitable for laser operation and this thesis focuses on diode-pumped solid-state lasers employing crystals doped with the trivalent rare-earth ions neodymium (Nd3+), ytterbium (Yb3+) and erbium (Er3+). Especially, the quasi-three-level transitions in Nd and Yb have been studied as well as the eye-safe three-level transition around 1. LÄS MER
35. Spectroscopy of neutron deficient nuclei in the A=90 and A=170 mass regions
Sammanfattning : .... LÄS MER
