Search for dissertations about: "Hydrogen Impurities"
Showing result 21 - 25 of 33 swedish dissertations containing the words Hydrogen Impurities.
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21. Electrically active defects in 4H silicon carbide
Abstract : Development of future technology needs to widen the application areas of semiconductor devices. The increased requirements are beyond the limits of the most common semiconductors today like silicon or gallium arsenide. Use of new materials could resolve many performance issues and also offer increased reliability and reduced cost of the devices. READ MORE
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22. Tribology of carbon fiber reinforced PTFE composites in dry gas environments
Abstract : With hydrogen being one of the key pillars of decarbonization, the reliability and efficiency of hydrogen applications become increasingly important. In applications such as oil-free reciprocating hydrogen compressors and Stirling engines, the self-lubricating pistonrings and other dynamic seals are critical components in terms of efficiency, service life and proper functioning. READ MORE
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23. Metal-exchanged zeolites for NH3-SCR applications - Activity and Deactivation studies
Abstract : Emissions of nitrogen oxides (NOX) formed during the burning process in internal combustion engines is a major contributor to global air pollutions. One effective way to reduce NOX in lean environments, i.e. oxygen excess is selective catalytic reduction with ammonia (NH3-SCR). READ MORE
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24. Evaluation of NMR Knight shifts in metallic nanoparticles and topological matter
Abstract : Elucidating the surface electron states of transition metal compounds is of primary importance in main heterogeneous catalytic processes, such as the hydrogen and oxygen evolution reactions. Key property in all these processes is the position of the energy of the d-band center relative to the Fermi-level of the catalyst; it must be shifted close to the Fermi level to achieve balance between adsorption and desorption of the catalyst and the adsorbate. READ MORE
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25. Alumina Thin Film Growth: Experiments and Modeling
Abstract : The work presented in this thesis deals with experimental and theoretical studies related to the growth of crystalline alumina thin films. Alumina, Al2O3, is a polymorphic material utilized in a variety of applications, e.g., in the form of thin films. READ MORE