Search for dissertations about: "Jan-Erik Berg"

Found 4 swedish dissertations containing the words Jan-Erik Berg.

  2. 1. Fracture Behaviour of Wood and Fibres as Related to the Mechanical Pulping Process

    Author : Jan-Erik Berg; Mittuniversitetet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustic emission; Engineering mechanics; Teknisk mekanik;

    Abstract : The fibre separation step in refining is crucial to energy consumption.... READ MORE

  4. 2. Wood and fibre mechanics related to the thermomechanical pulping process

    Author : Jan-Erik Berg; Per Engstrand; Per A. Gradin; Tomas Björkqvist; Mittuniversitetet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustic emission; Chips; Compression tests; Defibration; Disc refiners; Energy consumption; Fibre structure; Force sensors; Fracture; Impact strength; Mathematical analysis; Moisture content; Picea abies; Refining; Stiffness degradation; Strains; Temperature; Thermomechanical pulping; Velocity; Chemical engineering; Kemiteknik;

    Abstract : The main objective of this thesis was to improve the understanding of some aspects on wood and fibre mechanics related to conditions in the thermomechanical pulping process. Another objective was to measure the power distribution between the rotating plates in a refiner. READ MORE

  5. 3. Everyday Mobility and Travel Activities during the first years of Retirement

    Author : Jessica Berg; Jan-Erik Hagberg; Marianne Abramsson; Lena Levin; Kerstin Westin; Linköpings universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Ageing; retirement; mobility; travel activities; place; time-geography; interviews; travel diaries; qualitative longitudinal analysis; åldrande; pensionering; mobilitet; resande; aktivitet; plats; tidsgeografi; intervjuer; resdagböcker; kvalitativ longitudinell analys; 11 Road: Personal transport;

    Abstract : Mobility is central to living an independent life, to participating in society, and  to maintaining well-being in later life. The point of departure in this thesis is that retirement implies changes in time-space use and interruption in routines, which influence demands and preconditions for mobility in different ways. READ MORE

  6. 4. Process intensification in mechanical pulping : Reduced process complexity and improved energy efficiency

    Author : Christer Sandberg; Per Engstrand; Jan-Erik Berg; Göran Bengtsson; Mittuniversitetet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : This work shows that, for newsprint quality grades, the production processes for mechanical pulp can be simplified, and the specific electrical energy demand can be reduced with around 600 kWh/ton (30%). The purpose of the work is to demonstrate how the production cost for mechanical pulps can be decreased through increased energy efficiency and reduced number of unit operations. READ MORE