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Showing result 1 - 5 of 6 swedish dissertations matching the above criteria.

  2. 1. Magnetic and Structural Properties of f-electron Systems from First Principles Theory

    Author : Torbjörn Björkman; Olle Eriksson; Thomas Schulthess; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Materialvetenskap; Materials Science;

    Abstract : A series of studies of f-electron systems based on density functional theory methods have been performed.  The focus of the studies has been on magnetic and structural properties, as well as investigating ways to handle strong electron correlation in these systems. READ MORE

  4. 2. Alternative Methods for Assessment of Split Renal Function

    Author : Henrik Björkman; Anders Magnusson; Jonas Wadström; Torbjörn Andersson; Uppsala universitet; []
    Keywords : Radiology; Split renal function; Live kidney donor; CT; Renography; Dynamic MRI; Renal volume; Respiratory triggering; Radiologisk forskning;

    Abstract : Living kidney donation is a clinical situation with unique features in the sense that healthy individuals voluntarily expose themselves to certain risks and inconveniences. Therefore, eliminating as much of the associated discomfort as possible is crucial. READ MORE

  5. 3. Influence of defects and impurities on the properties of 2D materials

    Author : Soumyajyoti Haldar; Biplab Sanyal; Olle Eriksson; Torbjörn Björkman; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; 2D Materials; Defects on 2D materials; Impurities on 2D materials; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : Graphene, the thinnest material with a stable 2D structure, is a potential alternative for silicon-based electronics. However, zero band gap of graphene causes a poor on-off ratio of current thus making it unsuitable for logic operations. This problem prompted scientists to find other suitable 2D materials. READ MORE

  6. 4. Theoretical prediction of properties of atomistic systems : Density functional theory and machine learning

    Author : Alexander Lindmaa; Rickard Armiento; Igor Abrikosov; Torbjörn Björkman; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The prediction of ground state properties of atomistic systems is of vital importance in technological advances as well as in the physical sciences. Fundamentally, these predictions are based on a quantum-mechanical description of many-electron systems. READ MORE

  7. 5. Exploring magnetocaloric materials by ab-initio methods

    Author : Rafael Martinho Vieira; Heike C. Herper; Torbjörn Björkman; Olle Eriksson; Markus Gruner; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetocaloric; magnetism; ab-initio;

    Abstract : This thesis explores the characterization of magnetocaloric materials from first-principles calculations, emphasizing entropy variation associated with the magnetocaloric effect. The study happens in the context of the search for new magnetocaloric materials to be applied in domestic magnetic refrigerators,  as environmentally friendly and energy-efficient alternatives to conventional vapor-compression devices. READ MORE