Sökning: "per hedström"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden per hedström.

  1. 1. Climate change impacts on production and dynamics of fish populations

    Författare :Per Hedström; Pär Byström; Jan Karlsson; Peter Eklöv; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Temperature; terrestrial dissolved organic carbon; light extinction; GPP; recruitment; winter mortality; metabolism; cohort competition; fish production; fish biomass;

    Sammanfattning : Ongoing climate change is predicted to increase water temperatures and export of terrestrial dissolved matter (TDOM) to aquatic ecosystems influencing ecosystem productivity, food web dynamics and production of top consumers. Ecosystem productivity is mainly determined by the rates of primary production (GPP) in turn controlled by nutrients, light availability and temperature, while temperature alone affect vital rates like consumption and metabolic rates and maintenance requirements of consumers. LÄS MER

  3. 2. Skönhet och skötsamhet : Konstnärliga utsmyckningar i svenska skolor 1870-1940

    Författare :Per Hedström; Margaretha Rossholm Lagerlöf; Yvonne Eriksson; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Art in schools; Carl G. Laurin; Carl Larsson; Ellen Key; Georg Pauli; mural painting; public art; Art; Konstvetenskap;

    Sammanfattning : This thesis is about the permanent artistic decoration of Swedish school buildings during the period 1870–1940. Its main aim is to examine the ideals and values which the works installed can be said to convey. LÄS MER

  4. 3. Fuel Cells and Biogas

    Författare :Lars Hedström; Per Alvfors; Peter Lund; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; air bleed; biogas; carbon dioxide; carbon monoxide; current distribution; dilution; efficiency; energy conversion; energy systems; experimental; fuel cell; fuel cell systems; PEFC; poisoning; reformate; SOFC; Chemical energy engineering; Kemisk energiteknik;

    Sammanfattning : This thesis concerns biogas-operated fuel cells. Fuel cell technology may contribute to more efficient energy use, reduce emissions and also perhaps revolutionize current energy systems. The technology is, however, still immature and has not yet been implemented as dominant in any application or niche market. LÄS MER

  5. 4. Railway Infrastructure Robustness : Attributes, evaluation, assurance and improvement

    Författare :Per Norrbin; Ragnar Hedström; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance Engineering;

    Sammanfattning : According to the European program Horizon 2020, multifaceted challenges in transportinfrastructure include 1) making infrastructure more resilient to keep pace with the increasing mobility needs; 2) reducing the impact of infrastructure on the environment;and 3) dealing with declining resources to maintain and upgrade transport infrastructure. New design and maintenance approaches must be developed to handle these issues, ascurrent methods are inadequate. LÄS MER

  7. 5. Getting up when falling down : reducing fall risk factors after stroke through an exercise program

    Författare :Eva Holmgren; Per Wester; Britta Lindström; Gunilla Gosman-Hedström; Birgitta Lindmark; Umeå universitet; []
    Nyckelord :ADL; Balance; Depression; Exercise; Falls; Falls-efficacy; Gait; Health-related Quality of Life; Lifestyle Activities; Physiotherapy; Prevention; Rehabilitation; Stroke; Variability.; MEDICINE; MEDICIN; sjukgymnastik; Physiotherapy;

    Sammanfattning : The purpose of this thesis was to identify fall risk individuals (+55) after stroke by validating a fall risk index and in post-stroke individuals with high risk of falls evaluate the impact of an intervention program on fall risk factors.A previously developed fall risk index was validated, modified and re-validated. LÄS MER