Sökning: "UO2"

Visar resultat 36 - 40 av 44 avhandlingar innehållade ordet UO2.

1. 36. Oxidative Dissolution of Spent Fuel and Release of Nuclides from a Copper/Iron Canister : Model Developments and Applications

   Författare :Longcheng Liu; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; model; oxidative dissolution; spent fuel; radiolysis; release; mass transport; radionuclide; hydrogen; corrosion; canister; near field; repository; Chemical engineering; Kemiteknik;

   Sammanfattning : Three models have been developed and applied in the performance assessment of a final repository. They are based on accepted theories and experimental results for known and possible mechanisms that may dominate in the oxidative dissolution of spent fuel and the release of nuclides from a canister. LÄS MER

3. 37. Multipoles in Correlated Electron Materials

   Författare :Francesco Cricchio; Lars Nordström; Peter Oppeneer; Igor Solovyev; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; correlated electrons; magnetic ordering; multipoles; actinides; hidden order; high temperature superconductors; Fe pnictides; electronic structure calculations; Condensed matter physics; Kondenserade materiens fysik; Superconductivity; Supraledning; Electronic structure; Elektronstruktur; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : Electronic structure calculations constitute a valuable tool to predict the properties of materials. In this study we propose an efficient scheme to study correlated electron systems with essentially only one free parameter, the screening length of the Coulomb potential. LÄS MER

4. 38. DNA Binding of Metal Complexes. A Spectroscopic Study of Trigonal Ru(II)phenanthroline Complexes and Uranyl(VI) Ion with Respect to Specific Interactions with DNA

   Författare :Catharina Hiort; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; uranyl; nucleic acids; optical probes;

   Sammanfattning : The interaction of metal complexes with nucleic acids has attracted attention owing to their potentials as optical probes, probes of chirality, and for use as artificial restriction enzymes. To understand the underlying mechanisms in these contexts we studied the binding to DNA of the enantiomers of two chiral ruthenium(II) metal complexes ([Ru(phen)3]2+ and [Ru(phen)2]2+DPPZ) phen=1,10-phenanthroline, DPPZ=dipyrido[3,2-a:2',3'-c]phenazine, and of the linear uranium(VI) complex, uranyl ([UO2]2+), using linear dichroism, circular dichroism and luminescence, as well as nuclear magnetic resonance spectroscopy. LÄS MER

5. 39. Radiation Induced Processes at Solid-Liquid Interfaces

   Författare :Miao Yang; Mats Jonsson; Susanna Wold; Simon Pimblott; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : In the thesis, the reactions between water radiolysis products—H2O2, HO• and O2—with metals and metal oxides utilized in nuclear industry are studied. The reactions include not only surface reactions, e.g. redox reactions and catalytic decomposition of H2O2, but also solution reactions (Haber-Weiss reactions). LÄS MER

7. 40. Non-collinear Magnetism in d- and f-electron Systems

   Författare :Raquel Lizárraga Jurado; Olle Eriksson; Lars Nordström; Axel Svane; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Non-collinear magnetism; spin spirals; first principles; density functional theory; Fermi surfaces; electronic structure; f-electron systems; Fysik;

   Sammanfattning : In this thesis, non-collinear magnetism has been studied by using density functional theory and the augmented plane wave method with local orbitals (APW+lo). Two conditions for non-collinear instabilities have been identified in this thesis. First, the Fermi energy should cut through both spin up and down states. LÄS MER