Sökning: "Helen Olofsson"

Hittade 4 avhandlingar innehållade orden Helen Olofsson.

  1. 1. Strategy games; on survival and reproduction

    Författare :Helen Olofsson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ekologi; Ecology; evolution of sexual reproduction; dormancy; game theory; migration; bet-hedging; Life history theory;

    Sammanfattning : Classical evolutionary life history concerns questions such as optimal timing of maturation, life span and number of offspring. These questions have mostly been studied theoretically under the assumption that the environment is stable and without taking into account frequency and density dependence. LÄS MER

  2. 2. Skriftbruk i fordonsverkstaden : En studie av läs- och skrivstrategier i mötet med arbetslivets texter

    Författare :Helén Olofsson; Mara Westling Allodi; Gunilla Jansson; Anna-Lena Eriksson-Gustavsson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; literacy practices; reading-and-writing strategies; working life; upper-secondary school; vocational education; Education; Pedagogik; specialpedagogik; Special Education;

    Sammanfattning : The aim of the study was to describe the reading and writing activities that takes place in vehicle repair workshops and to elucidate how people experiencing low reading-and-writing ability describe their encounters with text in working life. Reading and writing are considered in the study from an educational-philosophical and special educational perspective. LÄS MER

  3. 3. Monitoring transport and fate of de-icing salt in the roadside environment : Modelling and field measurements

    Författare :Annika Lundmark; Per-Erik Jansson; Bo Olofsson; Ann-Catrine Norrström; Helen K. French; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chloride; De-icing salt; Groundwater; Modelling; Monitoring; Road; Roadside; Soil water; Water in nature and society; Vatten i natur och samhälle;

    Sammanfattning : Roads and traffic are a major non-point source of pollutants and may have severe impacts on surface water, groundwater, soil and vegetation. In cold climates, de-icing salt is one such pollutant that may cause increased chloride concentrations and induce other effects on the environment. LÄS MER

  4. 4. Water in roads: Flow paths and pollutant spread

    Författare :Hedi Rasul; B. Olofsson; Helen Kristine French; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; De-icing salt; Road; Tracer test; ERT; Water content; Road pollutants; Flow pathways; Land and Water Resources Engineering; Mark- och vattenteknik;

    Sammanfattning : For better road construction and maintenance while minimising damage to the environment and groundwater, it is essential to monitor and model hydrological impacts on roads and consider pollution of groundwater. Water content in unbound material in road layers changes continuously and water flow usually occurs along pathways that are the main corridors for pollutant spread to groundwater. LÄS MER