Sökning: "nitrogen iron"

Visar resultat 21 - 25 av 78 avhandlingar innehållade orden nitrogen iron.

  1. 21. Combined Iron-Manganese Oxides for Chemical-Looping with Oxygen Uncoupling

    Författare :Golnar Azimi; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Iron-manganese oxide.; Keywords: CO2 capture; Chemical-looping with oxygen uncoupling; Chemical-looping combustion;

    Sammanfattning : AbstractThe most important factor affecting global warming is the increased concentrations of greenhouse gases in the atmosphere. Carbon dioxide is considered as the most important anthropogenic greenhouse gas. LÄS MER

  2. 22. Screening of oxygen-carrier particles based on iron-, manganese-, copper- and nickel oxides for use in chemical-looping technologies

    Författare :Marcus Johansson; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Oxygen Carrier; Carbon Dioxide Capture; Chemical-Looping Combustion; Chemical-Looping Reforming; Nickel Oxide; Iron Oxide; Copper Oxide; Manganese Oxide;

    Sammanfattning : Capture and storage of carbon dioxide from combustion will likely be used in the future as a method of reducing emissions of greenhouse gases and thus be part of the overall strategy to stabilize the atmospheric levels of CO2. Chemical-looping combustion is a method of combustion where CO2 is inherently separated from the non-condensable components in the flue gas without the need for an energy intensive air separation unit. LÄS MER

  3. 23. Microstructural characterization of iron ore green pellets

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Iftekhar Uddin Bhuiyan; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical Technology; Kemisk teknologi;

    Sammanfattning : The aim of this thesis work was to develop new methodologies to characterize iron ore green pellets, in wet and dry state. The new characterization methods applied and developed in this work were mainly based on scanning electron microscopy (SEM) to gather both qualitative and quantitative data on different components of the pellets, i.e. LÄS MER

  4. 24. X-ray studies on the binary systems of iron with nitrogen, phosphorus, arsenic, antimony and bismuth

    Detta är en avhandling från Uppsala : Almqvist & Wiksell

    Författare :Gunnar Hägg; [1929]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  5. 25. Towards an understanding of diazocyte development and diazotrophy in the marine cyanobacterium Trichodesmium

    Detta är en avhandling från Stockholm : Department of Botany, Stockholm University

    Författare :Gustaf Sandh; Birgitta Bergman; Rehab El-Shehawy; Louis Sherman; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cyanobacteria; Trichodesmium; diazocyte; cell differentiation; nitrogen fixation; cell division; flavodoxin; NATURAL SCIENCES Biology Organism biology Plant physiology; NATURVETENSKAP Biologi Organismbiologi Växtfysiologi; växtfysiologi; Plant Physiology;

    Sammanfattning : Trichodesmium is a filamentous cyanobacterium of great ecological significance as it contributes significantly to primary production in oceans through an efficient nitrogen fixation strategy, including a unique cell type, the diazocyte. The aim of this thesis was to generate a deeper understanding of the structural and molecular background related to the development of diazocytes and the maintenance of diazotrophy in Trichodesmium erythraeum IMS101. LÄS MER