Sökning: "Lars Johansson"

Visar resultat 21 - 25 av 162 avhandlingar innehållade orden Lars Johansson.

  1. 21. Mechanical Pulp. Effects of Pretreatment and Wood Source on Fiber Separation and Pulp Properties

    Författare :Lars Johansson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; torsional stress; pulp properties; chips; impregnation; screw press; SEM; mechanical pulp; sulfonation; shear stress; fracture surface; wood quality; temperature;

    Sammanfattning : The work presented in this thesis concerns the mechanical pulping process and the effects of wood source and pretreatment conditions on the pulp properties. In the first part, the deformation of Norway spruce (Picea abies) wood samples was investigated under shear and torsional loading at different temperatures (20-95°C) and sulfonation conditions. LÄS MER

  3. 22. Engaged in digital service innovation

    Författare :Lars-Olof Johansson; Ulrika Lundh Snis; Dick Stenmark; Harald Holone; Högskolan Väst; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Digital service innovation; Human-Centred Service Systems; value; practice perspective; learning in practice; engaged scholarship research; Work Integrated Learning; Arbetsintegrerat lärande; Informatik; Informatics;

    Sammanfattning : The research in this thesis has digital services innovation to support Human-Centred Service Systems (HCSSs) from a practice theory perspective as a foundation. Digital service innovation is understood as service system reconfiguration due to digitalization, with the aim to change the service systemsin a way that increases the value for the involved actors. LÄS MER

  4. 23. Visualization/graphical modeling as a supporting tool in organizational development activities : an action oriented approach

    Författare :Lars-Olof Johansson; Växjö University; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Graphical modeling; Computer science; Datalogi;

    Sammanfattning : .... LÄS MER

  5. 24. Bitumen ageing and hydrated lime

    Författare :Lars S. Johansson; KTH; []
    Nyckelord :;

    Sammanfattning : This doctoral thesis consists of a literature review andfour papers describing experimental studies of the influence ofhydrated lime on bitumen ageing.The literature review describes contemporary knowledge ofbitumen with respect to chemistry, rheology and modification.The relation between chemical composition and mechanicalbehaviour is discussed. LÄS MER

  7. 25. Teenager fatalities : epidemiology and implications for prevention

    Författare :Lars Johansson; Anders Eriksson; Leif Svanström; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Teenager; fatalities; injury; suicide; alcohol; drugs; intoxication; trends; Forensic medicine; Rättsmedicin; Forensic Medicine; rättsmedicin;

    Sammanfattning : A significant number of teenagers are killed each year by unintentional or intentional injuries. A teenager is in a vulnerable phase of her/his life, going from being a child to adult. This transition often includes testing the limits of their capabilities, which can include, e.g. LÄS MER