Sökning: "Åke Fransson"

Hittade 5 avhandlingar innehållade orden Åke Fransson.

  1. 1. Optimal thinning : a theoretical investigation on individual-tree level

    Författare :Peter Fransson; Åke Brännström; Ola Lindroos; Oskar Franklin; Per Lundberg; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Forest management; Simulation; Optimization; Spatially explicit model; Individual-based model;

    Sammanfattning : Paper I: In paper I, we asked how a tree should optimally allocate its resources to maximize its fitness. We let a subject tree grow in an environment shaded by nearby competing trees. The competitors were assumed to have reached maturity and had stopped growing, thus creating a static light environment for the subject tree to grow in. LÄS MER

  3. 2. The multifaceted concept of oral health : Studies on a Swedish general population and perspectives of persons with experience of long-term CPAP-treated obstructive sleep apnea

    Författare :Hanna Ahonen; Ulrika Lindmark; Anders Broström; Eleonor I. Fransson; Åke Tegelberg; Jönköping University; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; adults; CPAP treatment; obstructive sleep apnea; oral health; oral health determinants;

    Sammanfattning : Oral health is a multifaceted and changeable part of our overall health and well-being as it contributes to important everyday functions such as eating, talking, and conveying feelings. Our oral health can be affected by a range of determinants, one of which is obstructive sleep apnea [OSA] treated with continuous positive airway pressure [CPAP]. LÄS MER

  4. 3. Body mass index, cognitive ability, and dementia : prospective associations and methodological issues in late life

    Författare :Anna Dahl; Stig Berg; Bo Malmberg; Linda Hassing; Eleonor Fransson; Sven Nilsson; Åke Wahlin; Jönköping University; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; aging; body mass index; cognition; dementia; epidemiology; longitudinal; population-based; prospective; Older people and ageing; Äldre och åldrande;

    Sammanfattning : The aims of the present study were to investigate the association between overweight and cognitive ability and dementia, and to evaluate the usefulness of self-reported body mass index (BMI) in late life and various data sources commonly used in epidemiological studies to identify persons with dementia. Data were drawn from three population-based studies: the Swedish Adoption/Twin Study of Aging (SATSA), Aging in Women and Men: A Longitudinal Study of Gender Differences in Health Behaviour and Health among Elderly (the Gender Study), and the Finnish Lieto Study. LÄS MER

  5. 4. Migratory routes and stopover behaviour in avian migration

    Författare :Robert Stach; Cecilia Kullberg; Sven Jakobsson; Thord Fransson; Åke Lindström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bird migration; migration routes; stopover; geolocator; radio telemetry; tracking; fuel deposition; etologi; Ethology;

    Sammanfattning : Migratory birds, some small and light weight as matchboxes, engage in seasonal inter-continental journeys in order to take advantage of the long summer days and abundance of food at northern latitudes to breed and raise their young, and then escape the harsh winters by migrating to lower latitudes. This thesis deals with two important aspects of migration, the routes taken during migration and the birds’ behaviour at stopovers. LÄS MER

  7. 5. Microphysical Conditioning of Gamma-Ray Burst Shocks

    Författare :Jacob Trier Frederiksen; Claes Fransson; Åke Nordlund; Mikhail V. Medvedev; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic fields; particle acceleration; plasma instabilities; gamma-ray bursts; collisionless shocks; relativistic outflows; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

    Sammanfattning : Gamma-Ray Bursts (GRBs) are believed to be connected with either collapse of massive stars or – in some cases – coalescing neutron stars, both of which cause extreme relativistic explosions observable from the entire Universe. GRBs produce rapid flashes of high energy radiation, extending up to 2MeV in photon energies: as much energy per photon as the rest mass of 4 electrons. LÄS MER