Sökning: "Doktorsavhandling"

Visar resultat 21 - 25 av 93830 avhandlingar innehållade ordet Doktorsavhandling.

  1. 21. A numerical investigation of energy conversions in geophysical boundary layers

    Författare :Patrik Andreasson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Sammanfattning : The detailed energy conversions in turbulent geophysical boundary layers are examined and quantified. The governing transport equations are solved by utilizing turbulence modelling. Different turbulence closures have been adopted for the boundary layers examined. LÄS MER

  3. 22. Hot working of powders : procedure and products

    Författare :Björn Arén; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik;

    Sammanfattning : This dissertation can be divided into two main parts. The first deals with the hot working conditions of mild steels in powder forging, the second with the deformation behaviour of powder forged products; both monolithic and compound parts are studied. LÄS MER

  4. 23. Formation of silicon nitride based materials by nitridation and sintering

    Författare :Alena Ashkin; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materialteknik; Engineering Materials;

    Sammanfattning : Todays demands on silicon nitride based materials for structural applications focus on microstructures rendering high strengths and reliability at reasonable costs. This work was mainly aimed at production of sialons for these types of applications by nitridation with subsequent sintering. LÄS MER

  5. 24. Transverse failure initiation in polymer composites

    Författare :Leif Asp; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymeric Composite Materials; Polymera konstruktionsmaterial;

    Sammanfattning : Transverse failure is one of the most important failure modes in polymer composites. The phenomenon often causes the first deviations from nonlinear laminate behavior. Also, in pressure vessels and pipes, fluid leakage through a path of transverse cracks is often the limiting design criterion. LÄS MER

  7. 25. Om organiserad komplexitet : integration av organisering, lärande och kunnande

    Författare :Sören Augustinsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industrial Work Environment; Industriell produktionsmiljö;

    Sammanfattning : The overall purpose of the thesis is how organisations can be understood according their own conditions instead of trying to make them more rational and structured than they actually are in practice. In order to accomplish this, the thesis includes theoretical discussions with support in the following central concepts: organisation, learning and knowing. LÄS MER