Search for dissertations about: "size effect"

Showing result 21 - 25 of 1952 swedish dissertations containing the words size effect.

2. 21. Incentives in Education and Moral Behavior in Groups

   Author : Pol Campos-Mercade; Nationalekonomiska institutionen; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Field experiment; Academic performance; Threshold incentives; Lab experiment; Moral action; Group size; Bystander effect; Volunteer s dilemma; Social preferences;

   Abstract : This thesis uses field experiments, lab experiments, and theory to study questions that are relevant to the fields of education and behavioral economics.The first paper, Threshold Incentives and Academic Performance, begins with the observation that students often face incentives to reach performance thresholds. READ MORE

4. 22. Population ecology of perch (Perca fluviatilis) in boreal lakes

   Author : Arne Linløkken; Eva Bergman; Larry Greenberg; Anders Hargeby; Karlstads universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; perch; growth; size; mortality; temperature; acidification; density; roach; competition; Biology; Biologi; Biology; Biologi;

   Abstract : I studied the effects of temperature, pH, competition and predation on Eurasian perch (Perca fluviatilis) in 30 lakes in Norway during 1981-2001. The study lakes were situated in two different areas in southern Norway; four lakes in Aust-Agder county in southernmost Norway were explored during 1981-1984 and 26 lakes in Hedmark county in south-eastern Norway were investigated during 1992-2001. READ MORE

5. 23. Dynamics of the aphid-ant mutualism

   Author : Karolina Tegelaar; Olof Leimar; Judith Bronstein; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; mutualism; transgenerational; aphids; aphid-ant; conflict of interest; E -β-farnesene; phenotypic plasticity; predation risk; wing induction; maternal effect; reproductive investment; embryo size; etologi; Ethology;

   Abstract : An appreciation of the role of mutualism is essential when studying ecology and evolution in most ecosystems. Information covering aspects of mutualistic interactions can serve as a complement to the somewhat one-sided perspective from the 1950’s and 60’s that is used when teaching biology. READ MORE

6. 24. Occupation-focused and occupation-based interventions for community-dwelling older people : Intervention effects in relation to facets of occupational engagement and cost effectiveness

   Author : Magnus Zingmark; Ingeborg Nilsson; Anne Fisher; Lars Lindholm; Kerstin Tham; Umeå universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Activities of daily living; Bathing disabilities; Cost effectiveness; Effect size; Health promotion; Occupational therapy; Leisure engagement; Reablement; Self-rated health; Successful aging; QALY;

   Abstract : Background Occupation-focused and occupation-based interventions can potentially promote occupational engagement among community-dwelling older people, but there is limited evidence to identify the most effective and cost-effective interventions. For independent-living older people, there is a lack of evidence to determine if occupation-focused and occupation-based interventions have an effect on their occupational engagement. READ MORE

7. 25. Studies of Volcanic Influence on Aerosols, Clouds and Climate

   Author : Johan Friberg; Ergonomi och aerosolteknologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; lowermost stratosphere; volcanic aerosol; upper troposphere; sulfurous aerosol; carbonaceous aerosol; ion beam analysis; volcanism; indirect effect; radiative forcing; direct effect; Stratosphere; Fysicumarkivet A:2016:Friberg;

   Abstract : This thesis focuses on the influence of volcanism on the compositions of the aerosols in the upper troposphere (UT) and lowermost stratosphere (LMS), and their direct and indirect impact on climate. Aerosol data were obtained by aircraft-borne sampling, using the CARIBIC (Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Container) platform, and laboratory-based ion beam analysis of aerosol samples at the Lund Ion Beam Analysis Facility (LIBAF). READ MORE