Sökning: "Lennart Bengtsson"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Lennart Bengtsson.

  1. 1. Efficient Density-Functional-Based Calculational Methods for Surfaces

    Författare :Lennart Bengtsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; potential energy surfaces; pseudopotentials; surface physics; density functional theory; optimization techniques; computer simulations;

    Sammanfattning : During the last decades, computer simulations have become an important tool for the study of elementary surface processes, such as atomic and molecular adsorption, diffusion of ad-atoms and surface recombination. The knowledge gained by such studies can be used to understand and develop technologically important processes such as catalysis and crystal growth. LÄS MER

  3. 2. Att lämna en placering i samhällsvård : En studie om ungas övergång från samhällsvård till vuxenliv

    Författare :Mattias Bengtsson; Peter Öberg; Yvonne Sjöblom; Lennart Nygren; Högskolan i Gävle; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; societal care; out-of-home care; youths; transitions; leaving care; care leavers; foster care; residential care; life course perspective; samhällsvård; placering; dygnsvård; ungdomar; transitioner; övergångar; familjehem; HVB; livsloppsperspektiv; Health-Promoting Work; Hälsofrämjande arbete;

    Sammanfattning : The focus in this thesis is young peoples’ (aged 17–20) experiences of leaving out-of-home care (OHC) and making the transition into adulthood. Prior research shows care leavers as a vulnerable group making the transition to adulthood at younger age, in shorter duration and with less support than their peers. LÄS MER

  4. 3. An Adjustable 3D Brain Atlas for Quantitative Analysis of Neuroimaging Data : Algorithmical and Methodological Aspects

    Författare :Lennart Thurfjell; Ewert Bengtsson; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Datoriserad bildanalys; Computerized Image Analysis;

    Sammanfattning : .... LÄS MER

  5. 4. A Variational data assimilation scheme and its use of meteorological observations

    Författare :Erik Andersson; Lennart Bengtsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; meteorologi; Meteorology;

    Sammanfattning : Meteorological data assimilation is the process by which a model simulation of the atmosphere is corrected by observations. In operational weather forecasting, this is done in near real-time, to provide accurate initial conditions for numerical forecasts. The accuracy of the forecasts depends crucially on the accuracy of the data assimilation. LÄS MER

  7. 5. Segmentation and Visualisation of Human Brain Structures

    Författare :Roger Hult; Ewert Bengtsson; Lennart Thurfjell; Håkan Hall; Ingrid Agartz; Arvid Lundervold; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bildanalys; segmentation; visualisation; brain; cortex; hippocampus; autoradiography; MRI; PET; ROI; Bildanalys; Image analysis; Bildanalys; Computerized Image Analysis; datoriserad bildanalys;

    Sammanfattning : In this thesis the focus is mainly on the development of segmentation techniques for human brain structures and of the visualisation of such structures. The images of the brain are both anatomical images (magnet resonance imaging (MRI) and autoradigraphy) and functional images that show blood flow (functional magnetic imaging (fMRI), positron emission tomography (PET), and single photon emission tomograpy (SPECT)). LÄS MER