2,548 research outputs found
Oxidation of Aluminium-Magnesium alloys at elevated temperature in the solid, semi-liquid and liquid states
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Sensitive thermogravimetric equipment was used to monitor the oxidation rates of A1-1 to 9% Mg alloys in 0.21 oxygen/0.79 helium mixtures with and without 0.03 atm water vapour pressure, in the temperature range 500-725°C which include their respective solid, semi-liquid and liquid states. These measurements were supported by structural and topographical studies of oxide films using SEM, X-ray diffraction, and TEM with electron diffraction and EDX techniques. The objective was to provide information in the context of dross formation during melting operations. The only oxidation product observed was MgO. The oxidation rates do not follow simple rate laws. The rate normally increases as the temperature is raised except for a curious inverse relationship for liquid alloys just above the liquidus temperatures due to the formation of undulating surfaces. An amorphous MgO film formed on liquid alloys restricted the initial oxidation but, following an incubation period, crystallisation of the film induced breakaway oxidation. The crystallisation was promoted by high magnesium contents, high temperatures and moist atmospheres. The oxidation rates for alloys in the semi-liquid state were as follows: (i) for 50% liquid, the rates were initially faster than those for wholly liquid alloys due to the presence of solid phase particles which acted both as disruptive stress-raisers and as sources of nuclei for crystallisation of the amorphous oxide film over the liquid phase. For the moist atmosphere: (i) wholly solid alloys and semi-liquid alloys with 50% liquid oxidised faster than in the dry atmosphere because of the injection of OH- ions into the oxide with consequent disruptive effects caused by hydrogen absorption by the alloy. The addition of 0.003% Be to Al-8% Mg alloy decreased the oxidation rate markedly by toughening the MgO films preventing cracking and hence the nucleation of tertiary MgO. Small additions of Mn or Zr offset the effect of Be and probably enhanced the Mg 2+ ion conductivity in the oxide by the 4+ injection of Mn 2+ , Mn 4+ or Zr ions. For alloys with Be, although breakaway eventually occurred it was not initiated by crystallisation of the amorphous film and moisture in the atmosphere increased the oxidation throughout the temperature range, 500-725°C.Financial support was provided by the
Science and Engineering Research Council (SERC), Swindon, U.K
Aberration-like cusped focusing in the post-paraxial Talbot effect
No full textWe present an analysis of the Talbot effect beyond the paraxial regime, where deviation from Fresnel propagation destroys perfect, periodic self-imaging. The resulting interference structures are examples of aberration without geometric optical rays, which we describe analytically using post-paraxial theory. They are similar to, but do not precisely replicate, a standard integral representation of a diffraction cusp (the Pearcey function). Beyond the Talbot effect, this result illustrates that aberration—as the replacement of a perfect focus with a cusp-like pattern—can occur as a consequence of improving the paraxial approximation, rather than due to imperfections in the optical system
C.J. Koch (1932 - )
No full textBiographical, bibliographical, and literary historiography of Australian author C.J. Koch
Audio Interview with Mr. C.J. Rayner Whiteley
No full textAudio - Mr. Whiteley recounts the story of delivering the message of the flood of 1904. He took seventeen hours by horse to travel from Perryvale to Edmonton. Billy Loutit took the same message by foot arriving in Edmonton about the same time. Mr. Whiteley discusses early settlers, farming, homesteading and businesses. He has many anecdotes about life and people living in Athabasca at the start of the twentieth century. He freighted for ten years with the Hudson's Bay Company and also discusses early farming prices and technology extensivelyInformative Interview of Mr. C.J. Raymor Whitely In April 1961 on a Reel to Reel tape recorded onto cassette by R. Tanhas March 198
1861-09-25 C.J. Talbot recommends D.P. Stowell for Lieutenant Colonel of the 1st Maine Cavalry
No full texthttps://digitalmaine.com/cw_me_1st_cav/1073/thumbnail.jp
Specialty farming in Idaho: Selecting a site
No full textBulletin no. 744 Moscow, Idaho :University of Idaho, College of Agriculture, Cooperative Extension System, 1992-10-01. Author(s): Barney, D.L.; Finnerty, T.L.; Mancuso, C.J
The Actors' Perceptions and Expectations of their Roles in BIM-based Collaboration
No full textThe inter-organisational collaboration with Building Information Modelling (BIM) is one of the hottest topics in construction sector nowadays. The implementation of BIM is a complex inter-organisational process, and the sharing of information among numerous actors from multi-disciplinary backgrounds may affect the actors’ role perception and performance. This study offers insights into the BIM roles of various actors by analysing a BIM-based project carried out by an integrated partnership across many tiers. The analysis identified inconsistencies between the actors' perceptions and their partners’ expectations of their BIM roles. Inconsistencies in BIM roles were more related to soft rather than hard (domain- or technical) skills. Mismatches were found in the architect's role, as it was deemed necessary to be more domain- and BIM-related, contrary to their perceptions. Likewise, the suppliers' role called for an enhanced BIM orientation. The paper concludes with set of suggestions for increasing the joint responsibility and supporting the multi-actor collaboration.Design & Construction ManagementSustainable Housing Transformatio
The Duke's prize, a story of art and heart in Florence.
No full textContains also: Peterson, C.J. Kate Mowbray's sacrifice.Mode of access: Internet
Strange Fellah! Review of Philip Butterss, An Unsentimental Bloke: The Life and Work of C.J. Dennis
No full textC.J. Dennis, author of The Songs of a Sentimental Bloke (1915), was once considered the unofficial poet laureate of Australia. Throughout his career he was erroneously conflated with his famous character 'the Bloke' in the public imagination. 'Many have imagined him as a sentimental bloke', argues Philip Butterss, 'an easygoing fellow with a naïve and slightly romantic view of the world'(1). Since three previous biographical works have the word 'sentimental' in the title, Butterss' decision to add the 'un' to 'sentimental' immediately signals his intention to examine the darker side of Dennis
July 30, 1905 Page four Col. landes doubles money invested Bank officers are elected Something doing in police lines Deserter when arrested about to be married Communication with the cape interrupted by fires Sailors' Union moves into new quarters
No full textSmith, C.J.; Landes, Henry; Petrerson, M.W.; Burnside, C.E.; Clark, G.F.; Felger, W.W.; Hill, D.H.; Talbot, W.; Walker, Cyrus; Levy, S.W.; Steinhart, L.; Lewis, Sol; Lewis, Rosa; Joacelyn, F.P.; Kendrick, John; Latimer, N.H.; Felger, W.W.; Hopkins, H. D.; McCurdy, James G.; Kalstrom, Charles; Woodley, Babe; Weber, Edward John; Pollard, Joseph; McGee, S.M.
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