Sökning: "sulfur"

Visar resultat 1 - 5 av 243 avhandlingar innehållade ordet sulfur.

  1. 1. Origin of volcanic sulfur in Iceland : a sulfur isotope study

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Peter Torssander; [1986]

    Sammanfattning : The chemistry and sulfur isotope composition have been determined in fresh and altered rocks and geothermal fluids in Iceland. Sulfur isotope ratios were analysed in 27 selected volcanic rocks, eight lava incrustations and three volcanic gas samples.The 63% of the basalts ranges from -2.0 o/oo to + 0. LÄS MER

  2. 2. Dynamic Sulfur Chemistry Screening, Evaluation and Catalysis

    Detta är en avhandling från Stockholm : KTH

    Författare :Rémi Caraballo; Olof Ramström; Nicolas Giuseppone; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Dynamic combinatorial chemistry; dynamic sulfur chemistry; thioglycoside; mutarotation; disulfide metathesis; hemithioacetal formation; 1H STD-NMR; inhibition; phosphine; Concanavalin A; beta-galactosidase; dynamic drug discovery.; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi; NATURAL SCIENCES Chemistry Organic chemistry Bioorganic chemistry; NATURVETENSKAP Kemi Organisk kemi Bioorganisk kemi;

    Sammanfattning : This thesis deals with the design, formation and evaluation of dynamic systems constructed by means of sulfur-containing reversible reactions, in organic and aqueous media and under mild conditions.In a first part, the synthesis of thioglycoside derivatives, constituting the biologically relevant starting components of the dynamic systems, is described. LÄS MER

  3. 3. The Fate of Sulfur during Oxy-Fuel Combustion

    Detta är en avhandling från Stockholm : KTH

    Författare :Daniel Fleig; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pulverized coal combustion; oxy-coal; SO3; Oxy-fuel; SO2; sulfur;

    Sammanfattning : Oxy-fuel combustion, where air is replaced by O2 and recycled flue-gas to enrich combustion products, is one of the main CO2 capture technologies suitable for large-scale coal-fired power plants. The changed combustion conditions in oxy-fuel combustion influences the sulfur chemistry, which has recently been the subject of increased attention due to the importance of sulfur species in corrosion and flue-gas cleaning issues. LÄS MER

  4. 4. Analytical Pyrolysis - Studies of Sulfur in Coal and Pulp

    Detta är en avhandling från Analytical Chemistry, Lund University

    Författare :Pernille Selsbo; [1996]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sulfur; pulp; PLS; PCA; fractionated pyrolysis; FPD; analytical pyrolysis; coal; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Sulfur in coal and pulp have been characterized using pyrolysis–gas chromatography with a sulfur-selective flame photometric detector (Py–GC/FPD). The samples (50–150 µg) were pyrolyzed at temperatures between 300 and 1400°C usually followed by a combustion in oxygen at high temperature (>1000°C). LÄS MER

  5. 5. Chemical Speciation of Sulfur and Metals in Biogas Reactors Implications for Cobalt and Nickel Bio-uptake Processes

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Sepehr Shakeri Yekta; Bo Svensson; Ulf Skyllberg; Åsa Danielsson; Charles Banks; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biogas; Anaerobic digestion; Chemical speciation; bio-uptake; Sulfur; Iron; Cobalt; Nickel; Biogas; Anaerob nedbrytning; Kemisk speciering; Bio-upptag; Svavel; Järn; Kobolt; Nickel;

    Sammanfattning : A balanced supply of micronutrients, including metals such as iron (Fe), cobalt (Co), and nickel (Ni), is required for the efficient and stable production of biogas. During biogas formation, the uptake of micronutrient metals by microorganisms is controlled by a complex network of biological and chemical reactions, in which reduced sulfur (S) compounds play a central role. LÄS MER