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Showing result 1 - 5 of 33 swedish dissertations matching the above criteria.

  2. 1. Deformation and martensitic phase transformation in stainless steels

    Author : Peter Hedström; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik;

    Abstract : The use of high-energy synchrotron x-rays which has enabled three- dimensional structural characterization from the nano- to the macroscopic scale, and now to the meso-scale, such as individual grains and dislocation structures, is a major scientific advance. This is the first technique with sufficient spatial resolution and penetration power to probe the local structure embedded deep within the material. READ MORE

  4. 2. Deformation induced martensitic transformation of metastable stainless steel AISI 301

    Author : Peter Hedström; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik;

    Abstract : Metastable stainless steels are promising engineering materials demonstrating good corrosion resistance and mechanical properties. Their mechanical properties are however significantly affected by the deformation induced martensitic transformation. READ MORE

  5. 3. Fuel Cells and Biogas

    Author : Lars Hedström; Per Alvfors; Peter Lund; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  6. 4. Climate change impacts on production and dynamics of fish populations

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

    Abstract : 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. READ MORE

  7. 5. Local Social Exposure and Inter-Neighborhood Mobility

    Author : Alex Giménez de La Prada; Peter Hedström; Eduardo Tapia; Petri Ylikoski; Gianluca Manzo; Linköpings universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Ethnic segregation; residential mobility; social interdependency;

    Abstract : Studies on ethnic residential segregation analyze how the inter-neighborhood mobility of individuals shapes their spatial distribution across cities. This literature has shown that the residential choices of households partly depend on the ethnic composition of their neighborhoods: higher in-group shares promote the presence of more in-group members, and vice versa. READ MORE