Sökning: "air pollutions"

Hittade 5 avhandlingar innehållade orden air pollutions.

  1. 1. Användning av tillgängliga klimat- och miljödata vid livslängdsbedömningar av byggnader

    Författare :Kjell Westberg; KTH; []
    Nyckelord :service life planning; degradation environment; degradation agents; transformation; buildings; structures; maintenance intervals; meteorological data; climate data; environmental data; air pollutions;

    Sammanfattning : Since there is a demand to achieve improved precision ofestimations of the service life of a building and itsmaintenance intervals, in international organisations tasks arerunning to establish methods, models and standards for servicelife estimations. However, exact estimations are not feasibleat a reasonable cost. LÄS MER

  3. 2. The variability in Salix BVOC emissions and possible consequences for managed SRC plantations

    Författare :Tomas Karlsson; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Salix; BVOCs; varieties; age; branch chamber; leaf chambe; GC-MS; aerosols; Salix; BVOCs; varieties; age; branch chamber; leaf chamber; GC-MS; aerosols;

    Sammanfattning : Willow (Salix spp.) trees have been used commercially since the 1980s to produce renewable energy. Some benefits with these trees are that they can clean soil from heavy metals, reduce the risk of nutrient leakage and eutrophication. LÄS MER

  4. 3. Towards Sustainable Construction: Life Cycle Assessment of Railway Bridges

    Författare :Guangli Du; Raid Karoumi; Håkan Sundquist; Helge Brattebo; KTH; []
    Nyckelord :Life cycle assessment; LCA; Environment; Railway Bridge; Sustainability; Järnvägsgruppen - Infrastruktur; Järnvägsgruppen - Infrastruktur;

    Sammanfattning : Since last few decades, the increased pressure from the environmental issues of natural resource depletion, global warming and air pollution have posed a great challenge worldwide. Among all the industrial fields, bridge infrastructures and their belonged construction sector contribute to a wide range of energy and raw materials consumptions, which is responsible for the most significant pollutions. LÄS MER

  5. 4. Metal-exchanged zeolites for NH3-SCR applications - Activity and Deactivation studies

    Författare :Soran Shwan; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; modeling; NOX.; Hydrothermal; Chemical; Kinetic; Copper; Deactivation; Iron; Zeolite; Nitrogen oxides; NH3; Ammonia; Catalyst; NSR; Emissions; Poisoning; Ageing; NH3-SCR;

    Sammanfattning : Emissions of nitrogen oxides (NOX) formed during the burning process in internal combustion engines is a major contributor to global air pollutions. One effective way to reduce NOX in lean environments, i.e. oxygen excess is selective catalytic reduction with ammonia (NH3-SCR). LÄS MER

  7. 5. Interactions between calcium and heavy metals in Norway spruce : Accumulation and binding of metals in wood and bark

    Författare :Ann Helén Österås; Maria Greger; Lena Kautsky; Douglas L. Godbold; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant physiology; Växtfysiologi;

    Sammanfattning : Waste products from the forest industry are to be spread in forests in Sweden to counteract nutrient depletion due to whole tree harvesting. This may increase the bioavailability of calcium (Ca) and heavy metals, such as cadmium (Cd), copper (Cu) and zinc (Zn) in forest soils. LÄS MER