Sökning: "nitrogen iron"

Visar resultat 6 - 10 av 78 avhandlingar innehållade orden nitrogen iron.

  1. 6. Factors influencing the success of pelagic cyanobacteria

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Per Hyenstrand; [1999]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; cyanobacteria; inorganic nitrogen; competition; iron; phytoplankton succession; Biologi; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi; limnologi; Limnology;

    Sammanfattning : Cyanobacteria are present in most aquatic systems, and pelagic bloom-forming species often flourish in lakes. Since blooms of cyanobacteria are undesirable for several reasons, e.g. they can result in foul odours and tastes as well as toxicity, these organisms have been subject to an extensive amount of research around the globe. LÄS MER

  2. 7. Metal-exchanged zeolites for NH3-SCR applications - Activity and Deactivation studies

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Soran Shwan; [2014]
    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

  3. 8. Iron Carbonyl Mediated Parallel Synthesis

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Henrik Gradén; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dienyl; scavenger; solid phase; galectin inhibitor; oseltamivir; iron carbonyl complex; polymer bound reagent; cation; linker; parallel synthesis; active ester;

    Sammanfattning : This thesis describes the examination and development of cationic iron carbonyl complexes for use in parallel synthesis both in solution phase and on solid phase. A solution phase methodology for carbon-carbon and carbon-heteroatom formation, utilizing polymer bound reagents and scavengers and amenable for automation has been successfully developed. LÄS MER

  4. 9. Nitrogen-cycling tracing methods Case studies at cold-climate mine sites in northern Sweden

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Lino Nilsson; Anders Widerlund; Andreas Bryhn; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geochemistry; Tillämpad geokemi;

    Sammanfattning : High nitrogen effluents from mine sites is an environmental issue which has received relatively little attention historically. In recent years a number of studies have showed the environmental effects of high nitrogen discharge to natural water bodies, which include local eutrophication, high risk of acute reducing conditions and changed species composition in the receiving waters. LÄS MER

  5. 10. NOx formation in iron ore rotary kilns

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Rikard Edland; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rotary kiln; Grate-Kiln process; emissions control; combustion chemistry; Nitrogen oxides;

    Sammanfattning : Iron ore pellets are often produced using the so-called Grate-Kiln process, which is designed to oxidize the magnetite (Fe3O4) to hematite (Fe2O3) and to sinter the pellets so they can be used in steel manufacturing. The heat required for this process comes from the combustion of a pulverized fuel in a rotary kiln, involving the formation of a jet flame. LÄS MER