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Showing result 21 - 25 of 37 essays matching the above criteria.

1. 21. Tribological evaluation of the contact between upper compression ring and cylinder liner with different surface coatings

   University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik

   Author : Pär Wassborg; [2016]
   Keywords : piston ring; cylinder liner; wear; friction; grey cast iron; titanium oxide; chromium oxide;

   Abstract : The constant pursuit in the automotive industry to increase the engines performance, new solutions are always developed and tested to reduce the friction and increase the efficiency in the engine. One component that contributes to friction losses is the piston ring pack where the top compression stands for up to 40 %. READ MORE

3. 22. Variability of GHG emissions from emergent aquatic macrophytes in mixed boreal and Equisetum dominated communities

   University essay from Linköpings universitet/Tema Miljöförändring; Linköpings universitet/Filosofiska fakulteten

   Author : Nina Marliden; [2015]
   Keywords : plant-mediated; GHG flux; methane; carbon dioxide; nitrous oxide; Equisetum fluviatile; wetland; lake;

   Abstract : Plants (macrophytes) growing in lake and wetland sediments are known mediators of greenhouse gases (GHG), specifically methane (CH4), carbon dioxide (CO2) and nitrous oxide (N2O). Current studies have emphasized the potential risk of underestimation regarding emissions of plant-mediated GHGs from terrestrial systems including lakes, streams and other freshwater bodies. READ MORE

4. 23. Fabrication and Characterization of UN-USix Nuclear Fuel

   University essay from KTH/Reaktorfysik

   Author : Alicia Marie Raftery; [2015]
   Keywords : ;

   Abstract : In this thesis, UN-U3Si2 nuclear fuel was fabricated using spark plasma sintering and characterized to analyze the microstructure and crystal structure of the resulting pellets. This work was done in collaboration with accident tolerant fuel research, an effort which aims at developing nuclear fuel with superior safety and performance compared to currently used oxide fuels. READ MORE

5. 24. Investigation of the dielectric breakdown strength of polymer nanocomposites

   University essay from Uppsala universitet/Tillämpad materialvetenskap

   Author : Mattias Karlsson; [2014]
   Keywords : breakdown; polyethylene;

   Abstract : The aim of this thesis is to investigate the possibility of enhancing the dielectric breakdown strength (DBS) of low density polyethylene (LDPE) with addition of voltage stabilizing additives. In the first part of the thesis, the influence of various process parameters on the alternating current DBS of pure LDPE and LDPE containing either 3 or 30 wt% magnesium oxide nanoparticles was investigated. READ MORE

6. 25. Iron Oxide Thin Film Growth On Ag(100)

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Synkrotronljusfysik

   Author : Sara Ataran; [2014]
   Keywords : Surface Science; Material Science; XPS X-Ray Photoelectron Spectroscopy ; STM Scaning Tunneling Microscopy ; LEED Low Energy Electron Diffraction ; Science General;

   Abstract : This thesis presents a study of iron oxide thin films, grown on a silver metal substrate, with the goal of characterizing the structures that form during growth of the first atomic layers. Such ultra-thin iron oxides are interesting model materials for fundamental surface chemistry and catalysis studies. READ MORE