Sökning: "Zirconium dioxide"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Zirconium dioxide.

  1. 1. Zirconium dioxide based dental restorations : studies on clinical survival and fracture behaviour

    Författare :Christel Larsson; Malmö högskola; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Zirconium dioxide; Y-TZP; Dental restorations;

    Sammanfattning : POPULÄRVETENSKAPLIG SAMMAN-FATTNINGAtt förlora tänder påverkar en människas utseende och funktioner såsom tal och tuggning. Det finns därmed ett behov att rehabilitera och ersätta förlorade tänder för att upprätthålla en god livskvalitet. LÄS MER

  3. 2. Porous Cerium Dioxide for Catalytic Applications

    Författare :Mats Lundberg; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; materialteknik; Chemical technology and engineering; Kemiteknik och kemisk teknologi; Materiallära; Material technology; catalysis; transmission electron microscopy; macroporous; mesoporous; cerium dioxide; zirconium dioxide;

    Sammanfattning : Mesoporous cerium dioxide with high crystallinity has been synthesized and studied by TEM, SEM, nitrogen adsorption, PXRD, AFM, and SAXS. The catalytic properties of the materials have been investigated The results of the catalysis experiments were correlated with high resolution TEM investigations of the corresponding material, and it was found that the exposed crystallographic facets play an important role in the conversion of carbon monoxide to carbon dioxide. LÄS MER

  4. 3. Micromechanical retention and chemical bonding to polycrystalline dental ceramics : studies on aluminum oxide and stabilized zirconium dioxide

    Författare :Evaggelia Papia; Malmö högskola; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; alumina; aluminium oxide; bond strength; oxide ceramics; polycrystalline dental ceramics; stabilized zirconium dioxide; Y-TZP; zirconia; adhesive cements;

    Sammanfattning : Det pågår en ständig utveckling av olika dentala material avsedda föratt ersätta förlorad tandsubstans. En materialgrupp som är särskiltintressant är höghållfasta keramiska material, oxidkeramer så somyttriumdioxidstabiliserad tetragonal polykristallin zirkoniumdioxid(Y-TZP). LÄS MER

  5. 4. Monolithic and semi-monolithic translucent zirconium-dioxide restorations : aspects on design, material and strength

    Författare :Fahad Bakitian; Malmö universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : Although many clinical reports have shown high rates of clinical success associated with fixed dental restorations made of traditional zirconium-dioxide (zirconia), clinical failure due to improper design aiming to achieve high strength and optimal aesthetics, still occurs. Previous clinical and laboratory studies indicated that veneering porcelain and the connector represent the weak parts of the fully-veneered zirconia restorations where failure may occur. LÄS MER

  7. 5. RhPt and Ni based catalysts for fuel reforming in energy conversion

    Författare :Angélica Viviana González Arcos; Lars J. Pettersson; Klas Engvall; Anker Jensen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RhPt bimetallic catalysts; Ni catalysts; ceria-zirconia; potassium tungsten bronze; zirconium dioxide; autothermal reforming; biodiesel; diesel; sulfur; deactivation; tar reforming; steam reforming; biomass gasification; auxiliary power units; naphthalene; Chemical Engineering; Kemiteknik;

    Sammanfattning : Although current trends in global warming are of great concern, energy demand is still increasing, resulting in increasing pollutant emissions. To address this issue, we need reliable renewable energy sources, lowered pollutant emissions, and efficient and profitable processes for energy conversion. LÄS MER