Sökning: "surface x-ray diffraction"

Visar resultat 16 - 20 av 270 avhandlingar innehållade orden surface x-ray diffraction.

  1. 16. Exploration of Non-Aqueous Metal-O2 Batteries via In Operando X-ray Diffraction

    Författare :Chenjuan Liu; Torbjörn Gustafsson; Laurence Hardwick; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Keywords: lithium-oxygen batteries; sodium-oxygen batteries; metal-air; in operando X-ray diffraction; cathode materials; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Sammanfattning : Non-aqueous metal-air (Li-O2 and Na-O2) batteries have been emerging as one of the most promising high-energy storage systems to meet the requirements for demanding applications due to their high theoretical specific energy. In the present thesis work, advanced characterization techniques are demonstrated for the exploration of metal-O2 batteries. LÄS MER

  3. 17. Advances in Biomolecular Imaging with X-ray Free-Electron Lasers

    Författare :Christofer Östlin; Carl Caleman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; XFEL; serial femtosecond x-ray crystallography; single particle imaging; radiation damage; GROMACS; Cretin; computer simulation;

    Sammanfattning : Utilizing X-rays to solve molecular structures has proven to be an immensely powerful and im- portant scientific technique. The invention of X-ray crystallography has allowed for countless breakthroughs in chemistry, biology and material science and remains the number one method used for structural determination today. LÄS MER

  4. 18. Dissociative Adsorption of CO2 on Copper: The Role of Steps

    Författare :Benjamin Hagman; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; koppar; CO2; Copper surface; Carbon Dioxide : chemistry; Dissociative adsorption; Surface oxidation; Ambient pressure X-ray photoelectron spectroscopy APXPS ; Surface X-ray diffraction SXRD ;

    Sammanfattning : CO2 chemistry has received significant interest in recent time, due to the greenhouse effects of CO2 emissions and the resulting climate change. CO2 reduction reactions, such as methanol synthesis and reverse water-gas shift, is providing a route for recycling of CO2 and thus limiting the CO2 emissions. LÄS MER

  5. 19. Surface Integrity Characterization of Gears with respect to Running-in

    Författare :Dinesh Mallipeddi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; micropitting; surface asperities; running-in; surface roughness; residual stresses; Gears; surface chemistry;

    Sammanfattning : A gearbox with gears of different sizes is part of a vehicle transmission system that plays an important part in transmitting the engine power to the wheels. The efficient energy transmission highly relies on the performance of gears. Together, the mesh efficiency and durability determines the gear performance. LÄS MER

  7. 20. Glypican-1: Structural and functional analysis of the N-glycosylated human protein

    Författare :Wael Awad Abdelhady; Biokemi och Strukturbiologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Proteoglycans; glypicans; glypican-1; heparan sulphate; N-glycosylation; exostosin-proteins; X-ray crystallography; crystal dehydration; diffraction anisotropy; Small angle X-ray scattering SAXS9; protein spectroscopy;

    Sammanfattning : Glypicans are multifunctional cell surface heparan sulphate proteoglycans co-regulating numerous signalling pathways, and are thereby involved in the control of cellular division, differentiation, and morphogenesis. The heparan sulphate (HS) chains are responsible for many of those biological functions; nevertheless recent studies suggest functional roles for the glypican core proteins in mediating the signalling of various growth factors. LÄS MER