Documents disponibles écrits par cet auteur

Application of closely spaced inclined channels in gravity separation of fine particles / K. P. Galvin in Minerals engineering, Vol. 23 N° 4 (Mars 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 4 (Mars 2010) . - pp. 326–338 Titre : Application of closely spaced inclined channels in gravity separation of fine particles Type de document : texte imprimé Auteurs : K. P. Galvin, Auteur ; J. Zhou, Auteur ; K. Walton, Auteur Année de publication : 2011 Article en page(s) : pp. 326–338 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Coal  Gravity  concentration  Elutriation  Oxide  ores  Gold  ores Résumé : This paper is concerned with the gravity separation of fine particles in a Reflux Classifier, a fluidized bed device with a system of parallel inclined channels located above. A significant advance is reported here over what was previously possible, through the application of a recent discovery described by Galvin et al. (2009). By using closely spaced inclined channels it is possible to achieve significant suppression of the effects of particle size, and hence produce a powerful separation on the basis of density. Experimental work was undertaken on the continuous steady state separation of coal and mineral matter, with a very narrow channel spacing of 1.77 mm used to process a feed finer than 0.5 mm in diameter, and a channel spacing of 4.2 mm used to process coarser feeds finer than 2.0 mm. These results are compared with previous findings reported in the literature for wider channels. The gravity separation performance is shown to be remarkably high, with a significant reduction in the variation of the separation density with particle size, and a significant reduction in the Ecart probable error, Ep. For example, over the particle size range 0.25–2.0 mm the composite Ep for the size range decreased from 0.14 for the wide channels used in previous studies to a typical level of 0.06 for the closely spaced inclined channels used in the present study. The separation performance was also shown to be insensitive to feed pulp density and feed solids throughput over a very broad range. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002404 [article] Application of closely spaced inclined channels in gravity separation of fine particles [texte imprimé] / K. P. Galvin, Auteur ; J. Zhou, Auteur ; K. Walton, Auteur . - 2011 . - pp. 326–338. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 4 (Mars 2010) . - pp. 326–338 Mots-clés : Coal  Gravity  concentration  Elutriation  Oxide  ores  Gold  ores Résumé : This paper is concerned with the gravity separation of fine particles in a Reflux Classifier, a fluidized bed device with a system of parallel inclined channels located above. A significant advance is reported here over what was previously possible, through the application of a recent discovery described by Galvin et al. (2009). By using closely spaced inclined channels it is possible to achieve significant suppression of the effects of particle size, and hence produce a powerful separation on the basis of density. Experimental work was undertaken on the continuous steady state separation of coal and mineral matter, with a very narrow channel spacing of 1.77 mm used to process a feed finer than 0.5 mm in diameter, and a channel spacing of 4.2 mm used to process coarser feeds finer than 2.0 mm. These results are compared with previous findings reported in the literature for wider channels. The gravity separation performance is shown to be remarkably high, with a significant reduction in the variation of the separation density with particle size, and a significant reduction in the Ecart probable error, Ep. For example, over the particle size range 0.25–2.0 mm the composite Ep for the size range decreased from 0.14 for the wide channels used in previous studies to a typical level of 0.06 for the closely spaced inclined channels used in the present study. The separation performance was also shown to be insensitive to feed pulp density and feed solids throughput over a very broad range. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002404

Behavior of cold bend pipes under bending loads / M. Sen in Journal of structural engineering, Vol. 137 N° 5 (Mai 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 5 (Mai 2011) . - pp. 571-578 Titre : Behavior of cold bend pipes under bending loads Type de document : texte imprimé Auteurs : M. Sen, Auteur ; Cheng, J. J. R., Auteur ; J. Zhou, Auteur Année de publication : 2011 Article en page(s) : pp. 571-578 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Pipe  Cold  bend  Bending  Buckle  Strain  Imperfection Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Ground movement along a buried pipeline often places the line in net compression. The local buckling resistance at cold bends is less than at straight sections, and hence, local buckling tends to occur at bends. Correspondingly, this full-scale testing program was conducted to investigate the local and global load-deformation relationships for seven cold bend pipes under applied loads. The specimens were loaded under bending, axial load, and internal pressure until local buckling occurred, and their curvatures were subsequently increased to establish their postbuckling behaviors. It was demonstrated though these tests that the buckling strain of the cold bend pipes was considerably lower than a straight pipe and that the presence of internal pressure exhibited a predominant role on the specimens load-deformation behaviors. It was also established that the behavior of the specimens was relatively unaffected by the bending methods that were employed during cold bending. DEWEY : 624 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i5/p571_s1?isAuthorized=no [article] Behavior of cold bend pipes under bending loads [texte imprimé] / M. Sen, Auteur ; Cheng, J. J. R., Auteur ; J. Zhou, Auteur . - 2011 . - pp. 571-578. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 5 (Mai 2011) . - pp. 571-578 Mots-clés : Pipe  Cold  bend  Bending  Buckle  Strain  Imperfection Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Ground movement along a buried pipeline often places the line in net compression. The local buckling resistance at cold bends is less than at straight sections, and hence, local buckling tends to occur at bends. Correspondingly, this full-scale testing program was conducted to investigate the local and global load-deformation relationships for seven cold bend pipes under applied loads. The specimens were loaded under bending, axial load, and internal pressure until local buckling occurred, and their curvatures were subsequently increased to establish their postbuckling behaviors. It was demonstrated though these tests that the buckling strain of the cold bend pipes was considerably lower than a straight pipe and that the presence of internal pressure exhibited a predominant role on the specimens load-deformation behaviors. It was also established that the behavior of the specimens was relatively unaffected by the bending methods that were employed during cold bending. DEWEY : 624 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i5/p571_s1?isAuthorized=no