Sökning: "DRIFTS"
Visar resultat 11 - 15 av 58 avhandlingar innehållade ordet DRIFTS.
11. Spectroscopic characterisation of surface hydroxyls during catalytic methane oxidation
Sammanfattning : Implementation of methane rich fuels as to develop sustainable vehicle transports requires improved catalytic exhaust aftertreatment technologies to convert engine-out methane emissions to carbon dioxide and water by total oxidation. A main challenge is that water formed during combustion inhibits the methane oxidation reaction even over the most active palladium-based catalysts presently known. LÄS MER
12. Spectroscopic investigation of palladium catalysts during wet methane oxidation
Sammanfattning : Abatement of the strong greenhouse gas methane in vehicle applications by use of catalytic end-of-pipe technologies is challenging due to the prevailing reaction conditions with low temperatures and high water content. In this thesis, the mechanisms behind low-temperature water inhibition of lean methane oxidation over palladium-based catalysts have been studied using an integrated experimental approach including wet-chemical preparation of model catalysts with systematic variation of key performance parameters, transient measurements of reaction kinetics in chemical flow reactor, and operando infrared and X-ray absorption spectroscopic characterisation. LÄS MER
13. Sawteeth and other Transport Phenomena Induced by Ex-drifts in Tokamaks
Sammanfattning : Electric fields and the concomitant ExB-drift play a prominent role in many plasma physics phenomena in Tokamaks. Several issues relevant for fusion research and related to the ExB-driven transport, are addressed in the present thesis. LÄS MER
14. Modeling and Tracking of Stochastic Polarization Drifts in Fiber-Optic Systems
Sammanfattning : In the past decade, accessing information has become easier than ever, leading to a rapid growth in popularity of social media, online gaming, and multimedia broadcast systems. These and other services put pressure on the Internet service providers to support high-speed Internet connections and motivate the need for faster communication systems. LÄS MER
15. Novel catalysts development for NOx reduction from H2 combustion engines
Sammanfattning : Hydrogen, as a clean energy carrier, burns without producing any carbon emissions. Hydrogen internal combustion engines (H2-ICE) are considered an alternative for the transition from conventional fossil-fuel vehicles. LÄS MER
