Sökning: "Oxidering"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet Oxidering.

  1. 1. Numerical Investigations on Debris Bed Coolability and Mitigation Measures in Nordic Boiling Water Reactors

    Detta är en avhandling från KTH Royal Institute of Technology

    Författare :Zheng Huang; KTH.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Severe accident; Debris bed; Coolability; Quench; Oxidation; MEWA code; Coupled analysis; Svåra haverier; Grusbädd; Kylbarhet; Kylning; Oxidering; MEWA program; Kopplad analys; Physics; Fysik;

    Sammanfattning : This thesis is aiming at coolability assessment of particulate debris beds formed in hypothetical severe accidents of Nordic boiling water reactors (BWRs) which may employ either lower drywell flooding or control rod guide tubes (CRGT) cooling as severe accident management strategies. For this purpose, quench and cooling limit (dryout) of debris beds after their formation from fuel coolant interactions were investigated by numerical simulations using the MEWA code. LÄS MER

  2. 2. Above and Below Graphene: Nanoparticle Chemistry and Interface Reactions

    Detta är en avhandling från KTH Royal Institute of Technology

    Författare :Elin Grånäs; Lund University.; Lunds universitet.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Graphene; Scanning tunneling microscopy; X-ray photoelectron spectroscopy; Adsorption; Nanoparticles; Ir 111 ; Surface science;

    Sammanfattning : The work presented in this dissertation addresses two main topics: (i) graphene supported nanoparticles and their stability upon gas adsorption, and (ii) intercalation of different molecules under graphene and their reactions under graphene. From an interplay of X-ray photoelectron spectroscopy, scanning tunneling microscopy, low energy electron diffraction, and density functional theory an atomic scale understanding of both the nanoparticles and the intercalated structures is obtained. LÄS MER

  3. 3. Studies of Electrocatalytic Reactions of NADH at Mediator Modified Electrodes and of H2O2 at Peroxidase Modified Electrodes

    Detta är en avhandling från Analytical Chemistry, Lund University

    Författare :Florentina Munteanu; Lund University.; Lunds universitet.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electrochemistry; Elektrokemi; kinetic studies; silica gel; titanium phoshate; zirconium phosphate; NADH; redox mediator; phenolic compounds; hydrogen peroxide; electron transfer; graphite and carbon paste electrodes; peroxidase; biosensor;

    Sammanfattning : This thesis addresses: (1) studies of direct and mediated electron transfer and kinetics of peroxidases on electrodes and the development of amperometric peroxidase-based biosenors, (2) electrochemical and kinetic studies of NADH oxidation at mediator modified electrodes. The direct and mediated electron transfer of horseradish and tobacco peroxidase were investigated on graphite electrodes by using wall-jet electrode methodology. LÄS MER

  4. 4. In situ structural studies and gas phase visualization of model catalysts at work

    Detta är en avhandling från Lund University, Faculty of Science, Department of Physics, Division of Synchrotron Radiation Research

    Författare :Sara Blomberg; Lund University.; Lunds universitet.; [2017-05]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CO-oxidation; model catalysts; AP-XPS; PLIF; Pd; Rh; PdAg; Fysicumarkivet A:2017:Blomberg;

    Sammanfattning : This thesis reports on in situ structural studies relevant to a catalytic surface during CO oxidation. The materials that have been studied are palladium, rhodium and an alloy of palladium and silver, with applications in emission cleaning by catalytic converters in vehicles. LÄS MER

  5. 5. A Chloroplast Localized Small Heat Shock Protein, Hsp21. Importance of Hsp21 in stress protection of transgenic Arabidopsis thaliana, recombinant expression and characterization of oxidation-dependent conformational changes

    Detta är en avhandling från Department of Biochemistry, Lund University

    Författare :Ulrika Härndahl; Lund University.; Lunds universitet.; [2000]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; a-crystallin; sHsp; chaperone; amphipathic a-helix; oligomer; redox-regulated; methionine sulfoxidation; oxidative stress; regulation; protein structure; circular dichroism; mass spectrometry; fluorescence spectroscopy; Biochemistry; Metabolism; Biokemi;

    Sammanfattning : A specific group of heat shock proteins, the so called small heat shock proteins (sHsps), exists in all organisms but are especially abundant in plants. The sHsps prevent aggregation of other proteins (substrate proteins) during transient heat and oxidative stress. LÄS MER