Browsing by Author "Vaughan, G."
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- ItemStructural evolution in Ti-Cu-Ni metallic glasses during heating(New York : American Institute of Physics, 2015) Gargarella, P.; Pauly, S.; Stoica, M.; Vaughan, G.; Afonso, C.R.M.; Kühn, U.; Eckert, J.The structural evolution of Ti50Cu43Ni7 and Ti55Cu35Ni10 metallic glasses during heating was investigated by in-situ synchrotron X-ray diffraction. The width of the most intense diffraction maximum of the glassy phase decreases slightly during relaxation below the glass transition temperature. Significant structural changes only occur above the glass transition manifesting in a change in the respective peak positions. At even higher temperatures, nanocrystals of the shape memory B2-Ti(Cu,Ni) phase precipitate, and their small size hampers the occurrence of a martensitic transformation.
- ItemVortex-averaged Arctic ozone depletion in the winter 2002/2003(München : European Geopyhsical Union, 2005) Christensen, T.; Knudsen, B.M.; Streibel, M.; Andersen, S.B.; Benesova, A.; Braathen, G.; Claude, H.; Davies, J.; De Backer, H.; Dier, H.; Dorokhov, V.; Gerding, M.; Gil, M.; Henchoz, B.; Kelder, H.; Kivi, R.; Kyrö, E.; Litynska, Z.; Moore, D.; Peters, G.; Skrivankova, P.; Stübi, R.; Turunen, T.; Vaughan, G.; Viatte, P.; Vik, A.F.; von der Gathen, P.A total ozone depletion of 68±7 Dobson units between 380 and 525K from 10 December 2002 to 10 March 2003 is derived from ozone sonde data by the vortex-average method, taking into account both diabatic descent of the air masses and transport of air into the vortex. When the vortex is divided into three equal-area regions, the results are 85±9DU for the collar region (closest to the edge), 52±5DU for the vortex centre and 68±7DU for the middle region in between centre and collar. Our results compare well with other studies: We find good agreement with ozone loss deduced from SAOZ data, with results inferred from POAM III observations and with results from tracer-tracer correlations using HF as the long-lived tracer. We find a higher ozone loss than that deduced by tracer-tracer correlations using CH4. We have made a careful comparison with Match results: The results were recalculated using a common time period, vortex edge definition and height interval. The two methods generally compare very well, except at the 475K level which exhibits an unexplained discrepancy.