Sökning: "FORESTRY"

Visar resultat 1 - 5 av 839 avhandlingar innehållade ordet FORESTRY.

  1. 1. Automation in forestry development of unmanned forwarders

    Detta är en avhandling från Umeå : Institutionen för datavetenskap, Umeå Universitet

    Författare :Ola Ringdahl; Thomas Hellström; Tomas Nordfjell; Arto Visala; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TECHNOLOGY Information technology Computer science; TEKNIKVETENSKAP Informationsteknik Datavetenskap; FORESTRY; AGRICULTURAL SCIENCES and LANDSCAPE PLANNING Area technology Forest engineering; SKOGS- och JORDBRUKSVETENSKAP samt LANDSKAPSPLANERING Areell teknik Skogsteknik; computer and systems sciences; data- och systemvetenskap;

    Sammanfattning : For the last 50 year, forestry operations have become more and more mechanized. In modern forestry in Europe two machines are typically used; a harvester that fells, debranches and cross-cuts the trees into logs and a forwarder that transports them to the nearest road. LÄS MER

  2. 2. Som man ropar i skogen : Modernitet, makt och mångfald i kampen om Njakafjäll och i den svenska skogsbruksdebatten 1970-2000

    Detta är en avhandling från Human Ecology Division, Lund University

    Författare :Ebba Lisberg Jensen; [2002]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; forestry technology; forestry; Silviculture; Njakafjäll; biodiversity; modernity; ecological modernisation; forestry debate; green thinking; Ecology; Skogsvetenskap; skogsbruk; skogsteknik; Ekologi;

    Sammanfattning : In this dissertation, the Swedish forestry debate during the last three decades of the 20th century is analysed. The contents, values and underlying assumptions of the debate are investigated from a discoursive point of view. Ideals, methods and aesthetics are analysed, as they have been expressed throughout the debate. LÄS MER

  3. 3. Ash Products for Nutrient Recycling in Forestry : Leaching and Drying Characteristics

    Detta är en avhandling från Human Ecology Division, Lund University

    Författare :Peter Mellbo; Tommy Claesson; Sirkku Sarenbo; Hans Samuelsson; [2007]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Ash products; Wood ash; Leaching; Drying; Nutrient; ; Sustainable forestry; FORESTRY; AGRICULTURAL SCIENCES and LANDSCAPE PLANNING Plant production Forestry; SKOGS- och JORDBRUKSVETENSKAP samt LANDSKAPSPLANERING Växtproduktion Skogsskötsel; Miljövetenskap; Environmental Science;

    Sammanfattning : As the demand for carbon dioxide neutral energy sources increases, forestry becomes more intensive. Entire trees are removed from the felling sites threatening the nutrient balance of the forest soils. LÄS MER

  4. 4. Towards semi-automation of forestry cranes automated trajectory planning and active vibration damping

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Szabolcs Fodor; Leonid Freidovich; Carlos Vázquez; Anton Shiriaev; Torben Ole Andersen; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forestry; forwarder cranes; semi-automation; slewing actuator; automated trajectory planning; oscillations; inner boom actuator; active vibration damping; frequency estimation; input shaping control technique; H2-optimal control;

    Sammanfattning : Forests represent one of the biggest terrestrial ecosystems of Earth, that can produce important raw renewable materials such as wood with the help of sun, air and water. To efficiently extract these raw materials, the tree harvesting process is highly mechanized in developed countries, meaning that advanced forestry machines are continuously used to fell, to process and to transport the logs and biomass obtained from the forests. LÄS MER

  5. 5. Skog, makt och människor. En miljöhistoria om svensk skog 1800-1875

    Detta är en avhandling från Kungliga Skogs och Lantbruks Akademien

    Författare :Per Eliasson; [2002]
    Nyckelord :HUMANIORA; HUMANITIES; forest commons; science of forestry; forest crimes; desiccation; silviculture; environmental history; forests; Silviculture; forestry; forestry technology; Skogsvetenskap; skogsbruk; skogsteknik;

    Sammanfattning : The aim of this dissertation is to investigate how and why silviculture was introduced in Sweden in the nineteenth century and the consequences this introduction had during the same period. The term silviculture refers to the systematic cultivation of high forest, a method that spread from Germany at the end of the eighteenth century. LÄS MER