Sökning: "Jan-erik Berg"
Hittade 4 avhandlingar innehållade orden Jan-erik Berg.
1. Fracture Behaviour of Wood and Fibres as Related to the Mechanical Pulping Process
Sammanfattning : The fibre separation step in refining is crucial to energy consumption.... LÄS MER
2. Wood and fibre mechanics related to the thermomechanical pulping process
Sammanfattning : 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. LÄS MER
3. Everyday Mobility and Travel Activities during the first years of Retirement
Sammanfattning : 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. LÄS MER
4. Process intensification in mechanical pulping : Reduced process complexity and improved energy efficiency
Sammanfattning : 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. LÄS MER