Sökning: "seasons"

Visar resultat 11 - 15 av 259 avhandlingar innehållade ordet seasons.

  1. 11. Impact of school outdoor environment upon pupils' physical activity and sun exposure across ages and seasons

    Författare :Peter Pagels; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Background and aims: Among children, the lack of physical activity (PA) is widespread in developed countries. Further, the majority of all skin cancers depend on an overexposure to solar ultraviolet radiation (UVR) in early life. LÄS MER

  3. 12. Epidemiology and prevention of football injuries

    Författare :Martin Hägglund; Jan Ekstrand; Lars Engebretsen; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Football; Injury prevention; Incidence; Re-injury; Rehabilitation; Elite; Social medicine; Socialmedicin;

    Sammanfattning : The aims of this thesis were to study the incidence, severity and pattern of injury in male and female elite football players; to study time trends in injury risk; to identify risk factors for injury; and to test the effectiveness of an intervention programme aimed at preventing re-injury.All studies followed a prospective design using standardised definitions and data collection forms. LÄS MER

  4. 13. Modelling Transpiration and Growth of Salinity and Drought Stressed Tomatoes

    Författare :Louise Karlberg; KTH; []
    Nyckelord :water-use efficiency; osmotic effect; ion toxicity; semi-arid;

    Sammanfattning : Irrigation with saline waters is an agricultural practicethat is becoming increasingly common as competition for freshwater increases. In this thesis the mechanisms behind salinityand drought stress has been studied using data from fieldexperiments in combination with a modelling tool, theCoupModel. LÄS MER

  5. 14. Adapting Scots pine Regeneration to the Changing Climate : An investigation of the effects of seed coating, arginine addition, and planting position

    Författare :Matej Domevscik; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : In Sweden, new forest stands have long been artificially regenerated using conifer seedlings. While standardized and widely adopted, this approach may need to be further adapted to the predicted increases in variations in the weather, such as extended periods of drought. LÄS MER

  7. 15. Greenhouse gas emission from tropical reservoirs : Spatial and temporal dynamics

    Författare :Annika Linkhorst; Sebastian Sobek; Frédéric Guérin; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; methane; carbon dioxide; climate; carbon cycle; lake; limnology; inland water;

    Sammanfattning : The emission of methane (CH4) and carbon dioxide (CO2) from reservoirs has been estimated to make up for about 1.3% of the global anthropogenic greenhouse gas emission. The impoundment of a river leads to the accumulation of sediment that is brought in from inflowing rivers, and the sediment organic matter is degraded to CH4 and CO2. LÄS MER