Sökning: "Forests and forestry"

Visar resultat 1 - 5 av 117 avhandlingar innehållade orden Forests and forestry.

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

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Szabolcs Fodor; Umeå universitet.; [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

  2. 2. Model-Based Stem Volume Retrieval and Windthrow Detection using CARABAS and P-band SAR

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Klas Folkesson; [2008]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CARABAS; remote sensing; forest monitoring; model-based stem volume retrieval; image segmentation; synthetic aperture radar SAR ; P-band; windthrow detection;

    Sammanfattning : Radar remote sensing is an efficient method for monitoring forests over large areas. Radar waves transmitted from a system carried by a satellite or an aircraft interact with trees on the ground, and the reflected waves are used to form images which are independent of weather and light conditions. LÄS MER

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

    Detta är en avhandling från Kungliga Skogs och Lantbruks Akademien

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

    Sammanfattning : Popular Abstract in Swedish Syftet med denna avhandling är att undersöka varför och hur skogsbruk införs i Sverige under 1800-talet och vilka konsekvenser det har under perioden. Med skogsbruk avses den systematiska odling av högskog som sprids från Tyskland från 1700-talets slut. LÄS MER

  4. 4. Cadmium induced kidney dysfunction in rodents and its relevance to biomonitoring experimental and environmental findings

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Per Leffler; Umeå universitet.; [1996]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Forestry; forest worker; chain saw; mechanization; rationalization; labour history; working life; technical change; cutting operation;

    Sammanfattning : This study deals with how workers actively introduced a new technique to their own labour process. More specifically, it is concerned with how Swedish forest workers during the 1950s gradually replaced the manual one-man crosscut saw with the motor-driven saw. LÄS MER

  5. 5. Land-Use and Climate Effects of Bioenergy: Carbon balances of Swedish forest bioenergy systems – and – Geospatial biomass supply-and-demand matching for Europe

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Olivia Cintas Sanchez; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GIS; EU; bioenergy; Sweden; agriculture; residues; Forestry; climate change; GHG balances;

    Sammanfattning : In order to keep global warming below 2 degrees Celsius, greenhouse gas emissions have to be drastically reduced. Bioenergy can play a role in climate change mitigation by substituting for energy from fossil fuels; however, biomass is a limited resource associated with emissions from land use and land-use change. LÄS MER