Sökning: "Electron paramagnetic resonance EPR"

Visar resultat 21 - 25 av 33 avhandlingar innehållade orden Electron paramagnetic resonance EPR.

1. 21. Magnetic Resonance Parameters of Radicals Studied by Density Functional Theory Methods

   Författare :Lyudmyla Telyatnyk; KTH; []
   Nyckelord :electronic g-tensor; hyperfine coupling constant; nuclear shielding tensor; spin restricted DFT; restricted-unrestricted appoach;

   Sammanfattning : The recent state of art in the magnetic resonance area putsforward the electron paramagnetic resonance, EPR, and nuclearmagnetic resonance, NMR, experiments on prominent positions forinvestigations of molecular and electronic structure. A mostdifficult aspect of such experiments is usually the properinterpretation of data obtained from high-resolution spectra,that, however, at the same time opens a great challenge forpure theoretical methods to interpret the spectral features. LÄS MER

3. 22. Lithium formate EPR dosimetry for accurate measurements of absorbed dose in radiotherapy

   Författare :Emelie Adolfsson; Åsa Carlsson Tedgren; Eva Lund; Håkan Gustafsson; Sara Olsson; Gudrun Alm Carlsson; Peter Sharpe; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

   Sammanfattning : Lithium formate has shown to be a material with properties suitable for electron paramagnetic resonance (EPR) dosimetry, among them up to 7 times higher sensitivity compared to alanine, which is a well-established EPR detector material for dose determinations in radiotherapy.The aim of this thesis was to further investigate the properties of lithium formate and develop the dosimetry system towards applications in radiotherapy. LÄS MER

4. 23. Optical and Magnetic Properties of Copper(II) Compounds

   Författare :Katia Júlia de Almeida; Olav Vahtras; Santiago Alvarez; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bioengineering; Bioteknik;

   Sammanfattning : This thesis encloses quantum chemical calculations and applications of a response function formalism recently implemented within the framework of density functional theory. The optical and magnetic properties of copper(II) molecular systems are the main goal of this work. LÄS MER

5. 24. Untangling ambiguities in the microbial fossil record : experimental abiotic and biological approaches

   Författare :Sigrid Huld; Anna Neubeck; Sebastian Willman; Sean McMahon; Barbara Cavalazzi; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; chemical gardens; pseudofossils; experimental mineralisation; microbial fossils; methanogens;

   Sammanfattning : Life on early earth has long been the topic of discussion for many researchers: how did it come to be? Which cells came first? Where can we find them? The most ancient rocks on our planet may hold some of the answers to these questions, but many may only be answered in laboratories. Chemical and morphological traces can be found from Archaean deposits, tantalisingly similar to modern day prokaryotes. LÄS MER

7. 25. Efficiency of molecular doping of conjugated polymers

   Författare :Emmy Järsvall; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : In recent years, organic semiconductors have become known as a promising alternative to traditional inorganic materials. Conjugated polymers are one of the most studied classes of organic semiconductors. Molecular doping is a powerful tool to tune their optical, electronic and –possibly– even the mechanical properties. LÄS MER