Sökning: "urea"

Visar resultat 1 - 5 av 162 avhandlingar innehållade ordet urea.

  1. 1. Urea Decomposition for Urea-SCR Applications

    Författare :Andreas Lundström; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NOx; Selective Catalytic Reduction; Urea; Thermolysis; Modeling; Computational Fluid Dynamics;

    Sammanfattning : Volatile emissions produced by the combustion of fossil fuels may be converted on a catalyst to less harmful products. During lean combustion an excess of oxygen in the exhaust gases together with a catalyst effectively oxidizes carbon monoxide and hydrocarbons into carbon dioxide and water. LÄS MER

  3. 2. On the mechanism of Urea-induced protein denaturation

    Detta är en avhandling från Umeå : Department of Chemistry, Umeå university

    Författare :Matteus Lindgren; Umeå universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemical denaturation; Protein unfolding; urea; MD simulations; NMR spectroscopy; NATURAL SCIENCES Chemistry Physical chemistry Biophysical chemistry; NATURVETENSKAP Kemi Fysikalisk kemi Biofysikalisk kemi; fysikalisk kemi; Physical Chemistry;

    Sammanfattning : It is well known that folded proteins in water are destabilized by the addition of urea. When a protein loses its ability to perform its biological activity due to a change in its structure, it is said to denaturate. LÄS MER

  4. 3. Urea and Non-Protein Nitrogen Metabolism in Infants With Special Reference to the Sudden Infant Death Syndrome (SIDS)

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Mary George; Uppsala universitet.; [2001]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Surgery; Urea; non-protein nitrogen metabolism; SIDS; drinking water nitrate concentration; carbon dioxide production; Kirurgi; MEDICINE Surgery; MEDICIN Kirurgi; anestesiologi; Anaesthesiology;

    Sammanfattning : A large amount of non-protein nitrogen, in the form of urea and ammonium, is present in human breastmilk; however its physiological role in the infant is as yet not fully understood. It has been hypothesized that an insufficient enteric metabolism of urea could play a role in the sudden infant death syndrome (SIDS). LÄS MER

  5. 4. Computational Fluid Dynamics and Experimental Studies of the Urea-SCR System

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Andreas Lundström; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; urea; SCR; decomposition; CYA; HNCO; NH3; CFD; thermolysis;

    Sammanfattning : Volatile emissions produced by the burning of fossil fuels may be converted on a catalyst to less harmful products. During lean combustion an excess of oxygen in the exhaust gases together with a catalyst effectively oxidizes carbon monoxide and hydrocarbons into carbon dioxide and water. LÄS MER

  7. 5. Corrosion of Stainless Steel in Diesel Exhaust Gas After-treatment Systems with Urea Injection

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Johanna Nockert; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; urea; stainless steel; thermal cycling; High temperature corrosion; AES; XPS; condensate; SCR; diesel exhaust;

    Sammanfattning : The demands on lowering the emissions from fossil fuel keep increasing. Together with higher demands of longer component lifetime and lighter vehicles for lower fuel consumption this has led to an increasing use of stainless steels in exhaust after-treatment systems. LÄS MER