Sökning: "Simon Berg"

Hittade 4 avhandlingar innehållade orden Simon Berg.

  1. 1. Technology and systems for stump harvesting with low ground disturbance

    Författare :Simon Berg; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Tree stumps could make a significant contribution to the transition from a fossil- to a bio-based economy, but current stump harvesting operations have adverse ecological effects. The ground disturbance caused by the up-rooting leads to increased carbon emissions from the soil and increases risks of leaching of heavy metals and nutrients, while removal of stump wood increases nutrient removal and reduces amounts of dead wood in the forest. LÄS MER

  3. 2. On Simulation of Uniform Wear and Profile Evolution in the Wheel - Rail Contact

    Författare :Roger Enblom; Mats Berg; Simon Iwnicki; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wheel-rail contact; wear; wear prediction; wear model; wheel profile; rail; Vehicle engineering; Farkostteknik;

    Sammanfattning : Numerical procedures for reliable wheel and rail wear prediction are rare. Recent development of simulation techniques and computer power together with tribological knowledge do however suggest computer aided wear prediction as possible. LÄS MER

  4. 3. Gymnasieelevers diskussioner utifrån hållbar utveckling : meningsskapande, naturkunskapande, demokratiskapande

    Författare :Katarina Ottander; Eva Silfver; Anders Berg; Shirley Simon; Leif Östman; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; science education; environmental- and sustainability education; ESE; education for sustainable development; ESD; scientific literacy; socioscientific issues; upper secondary school students. meaning-making; democracy; discursive psychology; naturvetenskaplig utbildning; miljö- och hållbarhetsutbildning; utbildning för hållbar utveckling; scientific literacy; sociovetenskapliga frågor; sociovetenskapliga dilemman; gymnasieelever; meningsskapande; demokrati; naturkunskapande; diskurspsykologi;

    Sammanfattning : In this thesis the focus is on upper secondary school students’ meaning-making in sustainability in science civic education. The aim is to study how meaning is created, if/how natural science is used and how democratic participation is constructed in students’ group discussions. LÄS MER

  5. 4. Tilting trains : Enhanced benefits and strategies for less motion sickness

    Författare :Rickard Persson; Mats Berg; Björn Kufver; Simon Iwnicki; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tilting trains; running time; ride comfort; motion sickness; tilt control; Vehicle engineering; Farkostteknik; Järnvägsgruppen - Gröna tåget; Järnvägsgruppen - Gröna tåget;

    Sammanfattning : Carbody tilting is today a mature and inexpensive technology that allows higher train speeds in horizontal curves, thus shortening travel time. This doctoral thesis considers several subjects important for improving the competitiveness of tilting trains compared to non-tilting ones. LÄS MER