Sökning: "Jan Öhman"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden Jan Öhman.

  1. 1. The measurement of compression wood and other wood features and the prediction of their impact on wood products

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Micael Öhman; Luleå tekniska universitet.; [2001]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träteknik; Wood Technology;

    Sammanfattning : Wood is a complex and highly variable biological material formed to give the tree best possible conditions for sustaining life. Thus every piece of wood is possessed of unique qualities. LÄS MER

  2. 2. Improving energy use in sawmills from drying kilns to national impact

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Jan-Olof Andersson; Luleå tekniska universitet.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Engineering; Energiteknik;

    Sammanfattning : Increased concern about environmental problems has amplified the public`s interest inenergy usage. The improved subsidies for biomass, together with the rising energy priceshave made biomass a desirable product on the energy market. LÄS MER

  3. 3. Residues from biochemical production of transport biofuels in Northern Europe combustion properties and applications

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Gunnar Eriksson; Luleå tekniska universitet.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Engineering; Energiteknik;

    Sammanfattning : Residues from biochemical production of liquid transport biofuels will probably become available for energy use if more gasoline and diesel is substituted. For processes used in northern Europe they amount to 35-65 % of the feedstock energy and despite interest from energy companies, their fuel properties are largely unknown. LÄS MER

  4. 4. Experimental studies of ash transformation processes in combustion of phosphorus-rich biomass fuels

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Alejandro Grimm; Luleå tekniska universitet.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energiteknik; Energy Engineering;

    Sammanfattning : The present thesis is a summary of eight papers dealing with experimental studies on bed agglomeration, slag formation, formation of deposits and fine particulate matter during combustion of phosphorus-rich biomass fuels. The experimental procedures were performed in a bubbling fluidized bed (5 kW), two fixed bed appliances (20 and 15 kW) and in a powder burner (150 kW). LÄS MER

  5. 5. Promoting adolescents' physical activity @ school

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Anna-Karin Lindqvist; Luleå tekniska universitet.; [2015]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Physiotherapy; Fysioterapi;

    Sammanfattning : The overall aim of this thesis was to explore the development of a health-promoting intervention that uses empowerment and information and communication technology, to examine the impact of the intervention and to describe adolescents' and parents' experiences of the intervention. This thesis includes four studies, three of which used a qualitative approach (I, III and IV) and one of which used a mixed method approach (II). LÄS MER