Sökning: "Subsurface oxygen"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden Subsurface oxygen.

  1. 1. Total-energy calculations with the effective-medium theory

    Författare :Uno Yxklinten; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; oxygen; subsurface site; total-energy calculations; force-dipole tensor; effective-medium theory; elastic properties; hydrogen; chemisorption; three-fold site; magnesium; adsorbate; aluminium;

    Sammanfattning : .... LÄS MER

  3. 2. Ghost in the shell : Studies on subsurface oxygen in oxide-derived copper nanocube catalysts

    Författare :Liu Chang; Lars Pettersson; Anders Nilsson; Tore Brinck; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : With the passage of time and the advancement of our industrial civilization, environmental concerns have become more and more recognized since the 1990s. Carbon dioxide reduction reactions are capable of converting carbon dioxide into valuable hydrocarbons and reducing the carbon emission from the combustion of fossil fuels. LÄS MER

  4. 3. Le Fantôme de l’Opéra - Studies on Atoms and Electrons Beneath

    Författare :Chang Liu; Lars G. M. Pettersson; Anders Nilsson; Anders Hellman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbon dioxide reduction; Subsurface oxygen; X-ray spectroscopy; Density functional theory; CO desorption; teoretisk fysik; Theoretical Physics;

    Sammanfattning : The carbon dioxide reduction reaction is a promising candidate to tackle ecological challenges of our age. This is due to its capability of reducing carbon dioxide emission generated from the combustion of fossil fuels by converting carbon dioxide into valuable hydrocarbons. LÄS MER

  5. 4. Nitrogen transformations in wetlands: Effects of water flow patterns

    Författare :Torbjörn Davidsson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Hydrobiology; hydrology; infiltration; subsurface flow; surface flow; wetland; nitrogen; Denitrification; mineralization; nitrification; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

    Sammanfattning : In this thesis, I have studied nitrogen turnover processes in watermeadows. A watermeadow is a wetland where water infiltrates through the soil of a grassland field. LÄS MER

  7. 5. Machinability of Single-phase Materials : Surface integrity and tool wear analysis

    Författare :Mike Olsson; Industriell Produktion; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machinability; Niobium; Tungsten; Oxygen-free copper; Surface integrity; Tool wear;

    Sammanfattning : The quality and performance of products are particularly important in sectors such as research facilities and in the nuclear, military and space industries. These sectors make use of high-performance materials that are uncommon in other contexts and therefore place high requirements on personnel, machines and tools. LÄS MER