Global ETD Search

101	Dispositifs optoélectroniques à base de semi-conducteurs organiques en couches minces Brunner, Pierre-Louis Marc 08 1900 (has links) No description available. Cellules solaires organiques Photovoltaïque Diodes organiques électroluminescentes Matériaux à bande interdite étroite Petite molécule de type push-pull Morphologie des films minces Matrices polymères Polymères électroluminescents Gabarit organique Patron nanométrique Substrats de NaCl Gaufre de silicium Rayon ionique focalisé Recyclage Rendements quantiques Réglage d’émission Goussets polymères Masse molaire des polymères Organic solar cells Photovoltaics Organic light-emitting diodes Low bandgap materials Push-pull small molecules Thin film morphologies Polymer matrices Polymer pockets Polymer molar mass Electroluminescent polymers Emission tuning Quantum yield Recycling Tin-doped indium oxide (ITO) Transmission electron microscopy Focused ion beam Silicon wafer NaCl substrates Organic templates Nano-patterning
102	The Effect of Salt Concentration on Aqueous Strong Acid, Carbon Dioxide, andHydrogen Sulfide Corrosion of Carbon Steel Madani Sani, Fazlollah January 2021 (has links) No description available. Chemical Engineering Petroleum Geology Materials Science Geochemistry Environmental Geology CO2 corrosion H2S corrosion Strong acid corrosion Corrosion modeling Solution chemistry modeling Diffusion coefficient model Concentrated brines NaCl solution MSE model HKF equations Pitzer equations Limiting current density equation Concentration unit conversion Corrosion model Corrosion rate measurement Carbon steel corrosion Salt
103	Impact of climate change-induced drought on tree root hydraulic properties and competition belowground / Einfluss von Bodentrockenheit auf die hydraulischen Eigenschaften und das Konkurrenzverhalten von Baumwurzeln Rewald, Boris 30 April 2008 (has links) No description available. 580 Pflanzen (Botanik) WNA 250 WVC 400 WVE 420 WVR 200 Mathematics and Natural Science Winterlinde Hainbuche Altbäume asymetrische Konkurrenz Buche Boden-Trockenheit Dach-Experiment Embolierate Feinwurzel Grobwurzel Klimawandel Olive Salzstress spezifische Leitfähigkeit Traubeneiche unterirdische Konkurrenz Xylemmorphologie Tilia cordata Carpinus betulus asymmetric competition belowground competition climate change coarse root drought stress embolism Fagus sylvatica fine root salt stress specific conductivity mature trees NaCl Olea europaea Quercus petraea roof experiment xylem morphology 42.40 42.58 42.97 43.47 43.61
104	An Analysis of Microstructure and Corrosion Resistance in Underwater Friction Stir Welded 304L Stainless Steel Clark, Tad Dee 30 June 2005 (has links) (PDF) An effective procedure and parameter window was developed for underwater friction stir welding (UWFSW) 304L stainless steel with a PCBN tool. UWFSW produced statistically significant: increases in yield strengths, decreases in percent elongation. The ultimate tensile strength was found to be significantly higher at certain parameters. Although sigma was identified in the UWFSWs, a significant reduction of sigma was found in UWFSWs compared to ambient FSWs. The degree of sensitization in UWFSWs was evaluated using double loop EPR testing and oxalic acid electro-etched metallography. Results were compared to base metal, ambient FSW, and arc welds. Upper and lower sensitization localization bands were identified in the UWFSWs. Although higher sensitization levels were present in UWFSWs compared to the arc weld, ambient FSW, and heat treated base metals, the UWFSWs were found less susceptible to corrosion than arc welds due to the subsurface location of the sensitization bands. A SCC analysis of UWFSWs relative to base metal and arc weldments was performed. U-bends were exposed to two 3.5% NaCl cyclic immersion experiments at 21 °C and 63 °C for 1000 hours each. A tertiary test was conducted in a 25% NaCl boiling solution. The UWFSW u-bends were no more susceptible to SCC than base metal in the cyclic immersion tests. In the boiling NaCl test, the SCC of the UWFSWs showed significant improvement over the SCC of arc welds. Arc u-bends cracked entirely within the weld bead and HAZ, while SCC in the UWFSWs showed no cracking localization. friction stir weld FSW underwater friction stir weld UWFSW stainless steel stir zone 304L austenite austenitic procedure process window welding parameters corrosion intergranular stress corrosion cracking SCC u-bend sensitization PCBN double loop EPR current ratio potentiostat electrochemical reactivation sampling area quantification tensile strength ductility elongation statistical significance microstructure optical microscopy oxidation surface finish base metal sigma Murakami oxalic acid electro-etch arc weld comparison cyclic immersion test boiling NaCl test subsurface location residual stress improvement superiority ASTM standard HAZ heat affected zone Mechanical Engineering

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