Search for dissertations about: "exchange interactions"

Showing result 1 - 5 of 226 swedish dissertations containing the words exchange interactions.

2. 1. DNA strand exchange and hydrophobic interactions between biomolecules

   Author : Bobo Feng; Chalmers University of Technology; []
   Keywords : NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; ATP synthase; DNA; membrane proteins; linear dichroism; Hydrophobic interactions; self-assembly; strand exchange; nanotechnology; liposomes;

   Abstract : The role of hydrophobic interactions in DNA strand exchange has been studied using fluorescence-labeled DNA oligomers in a FRET assay. Strand exchange was found to be accelerated in the presence of polyethylene glycol, which provides a crowded and hydrophobic environment possibly mimicking that of the catalytically active recombinase-DNA complexes. READ MORE

4. 2. Electronic structure and exchange interactions from ab initio theory : New perspectives and implementations

   Author : Ramon Cardias Alves de Almeida; Olle Eriksson; Anders Bergman; Attila Szilva; R. B. Muniz; Uppsala universitet; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; ab initio; exchange interactions; non-collinear magnetism; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Abstract : In this thesis, the magnetic properties of several materials were investigated using first principle calculations. The ab initio method named real space linear muffin-tin orbitals atomic sphere approximation (RS-LMTO-ASA) was used to calculate the electronic structure and magnetic properties of bulk systems, surface and nanostructures adsorbed on surfaces. READ MORE

5. 3. Modelling biomolecular interactions

   Author : Johan Bredenberg; Karolinska Institutet; Karolinska Institutet; []
   Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; Computational chemistry; molecular dynamics; nuclear receptors; force field parameterization; zinc fingers; DNA; proteins.;

   Abstract : Computational approaches for understanding and aiding in molecular biology has increased in significance over the last decades, where a wealth of biochemical experiments have provided a solid ground for developing computer models that can be used to predict unresolved issues within biology. Molecular dynamics (MD) is one of these methods, based on classical laws, and suitable for handling large macromolecules in their natural environment, water. READ MORE

6. 4. Spin ice and demagnetising theory

   Author : Mikael Twengström; Patrik Henelius; Peter Holdsworth; KTH; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Geometrical frustration; spin ice; Monte Carlo simulations; demagnetising theory; special temperatures; Ewald summation; neutron scattering; structure factors; loop algorithms; parallel tempering; frustrated ferromagnets; equilibration issues; long-range interactions; exchange interactions.; Physics; Fysik;

   Abstract : Frustration, or the inability to simultaneously minimise all local interactions is, a phenomenon occurring in a broad number of physical systems. We will in this thesis focus on a class of frustrated ferromagnetic materials called spin ices and how both numerical and experimental techniques can be used to understand their properties. READ MORE

7. 5. Interactions, initial states, and low-dimensional semiconductors

   Author : Peter Jaksch; Stephanie M. Reimann-Wacker; Linköpings universitet; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; Q!uantum mechanical interactions; quantum point contact QPC ; quantum wires; exchange-correlation energy; Reilly model; quantum algorithms; Physics; Fysik;

   Abstract : This thesis is concerned with different aspects of quantum mechanical interactions. The first part of the thesis focuses on their effects in low-dimensional semiconductors; the second part on one of their applications: quantum algorithms, which utilize superpositions created from quantum mechanical interactions. READ MORE