Zobrazeno 1 - 10 of 10 pro vyhledávání: '"S G Usmar"'
1
Spectral analysis of respiratory noise in horses with upper airway disorders
Autor: J. F. Burn, J. G. Lane, S G. Usmar, J. Shuttleworth, Samantha H. Franklin
Publikováno v: Equine Veterinary Journal. 35:264-268
Summary Reasons for performing study: It has long been recognised that the production of abnormal respiratory sounds by horses during exercise is frequently associated with upper airway obstructions. Respiratory acoustic measurements have shown promi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1dd911804c416b4232d3fd3c01840131
https://doi.org/10.2746/042516403776148228
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2
Positron states in pure and Fe doped polycrystalline YBa2Cu3O7- deltasuperconductors
Autor: Maurizio Biasini, Y. Xu, S G Usmar, A R Moodenbaugh, H.M. Fretwell
Publikováno v: Journal of Physics: Condensed Matter. 6:10487-10497
The temperature dependences of bulk positron annihilation parameters for pure and Fe doped YBa2Cu3O7- delta are considered in the context of temperature dependent positron trapping. Data for samples of composition YBa2(Cu1-xFex)3O7- delta with x=0.0,
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a31f8cb2da98148032e723e0d856e536
https://doi.org/10.1088/0953-8984/6/48/010
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3
Enhanced helium bubble diffusion in aluminum containing a liquid metal impurity
Autor: S. G. Usmar, C. De W. Van Siclen, R. N. Wright
Publikováno v: Journal of Nuclear Materials. 200:200-206
Remarkably rapid Brownian motion of helium bubbles in aluminum alloyed with very low concentrations of lead or of indium has been observed in situ by hot-stage transmission electron microscopy. Bubble diffusion is enhanced as the impurity, which appe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::472cb6479153bbbd1b88cafc2305c26f
https://doi.org/10.1016/0022-3115(93)90330-2
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4
Submicrostructural and microstructural evolution of pure and oxygen contaminated vacuum melt-spun 99.9999% Al and Al:90 at p.p.m. C
Autor: S. G. Usmar, R. N. Wright
Publikováno v: Journal of Materials Science. 27:5916-5920
Positron lifetime (PLS) and TEM studies have been completed on a series of pure, carbon-doped (∼90 at p.p.m.) and oxygen contaminated (340–670 at p.p.m.) vacuum melt-spun (VacMS) aluminium samples. Both TEM and PLS data have shown pure and carbon
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::568634fefc8bd82bf7f001221e9fb3bb
https://doi.org/10.1007/bf01119760
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5
Vacancy-type defects after post-growth heat treatment in SI GaAs: a positron study
Autor: J M Clayton, A Alam, D J Stirland, D T J Hurle, S G Usmar
Publikováno v: Semiconductor Science and Technology. 7:A233-A236
Positron lifetime results in semi-insulating and p-type materials after various heat treatments are presented. In as-grown and subsequently annealed (at 950 degrees C) materials a long-lived component of approximately 300 ps of substantial intensity
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1dbcf9a69b4a20ff0ffccd3f805de37e
https://doi.org/10.1088/0268-1242/7/1a/045
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9
Defect structures in cold worked and small grain pure and boron-doped Ni3Al alloys
Autor: S. G. Usmar, Kelvin G. Lynn
Publikováno v: Journal of Materials Research. 4:55-61
Positron lifetime spectroscopy was used to study the isochronal annealing of cold worked Ni3Al samples. In pure Ni76Al24, Ni74Al26, and boron-doped Ni74Al26 three annealing stages were observed. Boron-doped Ni76Al24 showed only two annealing stages.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9eb39095dab845f55182a09c729193d6
https://doi.org/10.1557/jmr.1989.0055
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