Sökning: "Carbon transfer efficiency"

Visar resultat 1 - 5 av 59 avhandlingar innehållade orden Carbon transfer efficiency.

  1. 1. Air-sea exchange of O2 and CO2 Processes controlling the transfer efficiency

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Andreas Andersson; Anna Rutgersson; Brian Ward; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; air-sea flux; oxygen; transfer velocity; water-side convection; Arctic; UVCN; Meteorology; Meteorologi;

    Sammanfattning : World oceans cover more than 70% of the earth surface and constitutes a major sink of atmospheric CO2. Two of the most important gases in the marine carbon cycling are O2 and CO2 and hence accurate descriptions of the air-sea gas exchange of these gases are crucial. LÄS MER

  2. 2. Towards 3D Integration of Carbon Based Electronics

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Wei Mu; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; transfer; carbon nanomaterials; polymer filling; MWCNTs; interconnect; 3D integration; packaging; graphene; horizontally aligned SWCNTs; through silicon via;

    Sammanfattning : Carbon-based nanomaterials such as carbon nanotubes (CNTs) and graphene, which possess superior electrical, thermal and mechanical properties, have been proposed as alternative materials for future electronics. The proposed applications span from the device level, replacing silicon-based transistors, with single-walled carbon nanotubes (SWCNTs) or graphene, to packaging level using multi-walled carbon nanotubes (MWCNTs) for interconnects. LÄS MER

  3. 3. Food web structures and carbon transfer efficiencies in a brackish water ecosystem

    Detta är en avhandling från Umeå : Umeå universitet, Institutionen för Ekologi, Miljö och Geovetenskap

    Författare :Kristin Dahlgren; Ulf Båmstedt; Agneta Andersson; Marja Koski; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbon transfer efficiency; Food web efficiency; zooplankton; production; pelagic; benthic; fatty acids; wax esters; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Marine ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Marin ekologi;

    Sammanfattning : Two differently structured food webs can be distinguished in the pelagic habitat of aquatic systems; the classical one (autotrophic) with phytoplankton as a base and the microbial food web (heterotrophic) with bacteria as a base. Energy (produced at the basal trophic level) reaches higher trophic levels, i.e. LÄS MER

  4. 4. An Experimental and Theoretical Study of Decentralized Gas Fired Liquid Heating

    Detta är en avhandling från Department of Chemical Engineering, Lund University

    Författare :Rolf Christensen; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; liquid heating.; efficiency; environmental impact; emissions; corrugated tube; heat transfer augmentation; heat transfer enhancement; energy conservation; decentralized heating; Natural gas; steam replacement; gas firing; Carbochemistry; petrochemistry; fuels and explosives technology; Petrokemi; bränslen; sprängämnen;

    Sammanfattning : The effects on the energy situation in industry when gas fired liquid heaters replace steam have been determined by energy surveys performed in a brewery and a slaughterhouse, measurements of the performance and emissions from liquid heaters installed in these industries, and theoretical analyses of the potential energy saving. The theoretical study in the first part of the project provides information that allows assessment of the effects on the energy situation, of part or complete conversion to decentralized heating, under the conditions prevailing in the industries concerned. LÄS MER

  5. 5. MECHANISMS OF ENHANCED ACTIVITY OF MODEL TiO2/CARBON and TiO2/METAL NANOCOMPOSITE PHOTOCATALYSTS

    Detta är en avhandling från Department of Chemical Engineering, Lund University

    Författare :Raja Sellappan; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Photocatalysis; graphite; solar energy conversion; graphene; localized surface plasmon resonance; photocatalytic mechanisms; nanocomposites; TiO2; carbon;

    Sammanfattning : TiO2 is the most widely used photocatalyst for energy and environmental applications because of its outstanding physical and chemical properties. However, the quantum efficiency of TiO2 is greatly diminished by fast electron-hole pairs recombination and light absorption only in the UV region. LÄS MER