Documents disponibles écrits par cet auteur

Intensification of catalytic oxidation with a T-junction microchannel reactor for deep desulfurization / D. Huang in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3870–3875 Titre : Intensification of catalytic oxidation with a T-junction microchannel reactor for deep desulfurization Type de document : texte imprimé Auteurs : D. Huang, Auteur ; Y. C. Lu, Auteur ; Y. J. Wang, Auteur ; L. Yang, Auteur Année de publication : 2008 Article en page(s) : p. 3870–3875 Note générale : Bibliogr. p. 3874-3875 Langues : Anglais (eng) Mots-clés : Microreactor  system;  Dibenzothiophene;  Deep  desulfurization Résumé : In this paper, a microreactor system is developed to enhance the oxidation of dibenzothiophene (DBT) and 4,6-DMDBT for deep desulfurization with the oxidant of hydrogen peroxide. A T-junction microchannel was applied to form the aqueous slug flow and a long PTFE (polytetrafluoroethylene) capillary with an inner diameter of 1 mm was connected directly downstream to maintain the two-phase dispersion condition. Surfactant of octadecyltrimethyl ammonium bromide (STAB) and phosphotungstic acid (TPA) were mixed in the microchannel to form the combined amphiphilic catalyst directly. The parameters affecting slug formation and DBT oxidation were investigated, including two-phase flow rates, temperature, surfactant type, and catalyst concentrations. DBT conversion of 97% was achieved with a residence time of 1.3 min at 60 °C. Furthermore, 4,6-DMDBT could also be effectively oxidized, and increasing the reaction temperature from 25 to 70 °C led to a substantial increase in 4,6-DMDBT conversions, from 57% at 25 °C to 97% at 70 °C. This T-junction microchannel reactor is far superior to the conventional equipment in terms of providing more interfacial area with much less power input. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701781r [article] Intensification of catalytic oxidation with a T-junction microchannel reactor for deep desulfurization [texte imprimé] / D. Huang, Auteur ; Y. C. Lu, Auteur ; Y. J. Wang, Auteur ; L. Yang, Auteur . - 2008 . - p. 3870–3875. Bibliogr. p. 3874-3875 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3870–3875 Mots-clés : Microreactor  system;  Dibenzothiophene;  Deep  desulfurization Résumé : In this paper, a microreactor system is developed to enhance the oxidation of dibenzothiophene (DBT) and 4,6-DMDBT for deep desulfurization with the oxidant of hydrogen peroxide. A T-junction microchannel was applied to form the aqueous slug flow and a long PTFE (polytetrafluoroethylene) capillary with an inner diameter of 1 mm was connected directly downstream to maintain the two-phase dispersion condition. Surfactant of octadecyltrimethyl ammonium bromide (STAB) and phosphotungstic acid (TPA) were mixed in the microchannel to form the combined amphiphilic catalyst directly. The parameters affecting slug formation and DBT oxidation were investigated, including two-phase flow rates, temperature, surfactant type, and catalyst concentrations. DBT conversion of 97% was achieved with a residence time of 1.3 min at 60 °C. Furthermore, 4,6-DMDBT could also be effectively oxidized, and increasing the reaction temperature from 25 to 70 °C led to a substantial increase in 4,6-DMDBT conversions, from 57% at 25 °C to 97% at 70 °C. This T-junction microchannel reactor is far superior to the conventional equipment in terms of providing more interfacial area with much less power input. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701781r

Measurements of transient ground movements below a ballasted railway line / J. A. Priest in Géotechnique, Vol. 60 N° 9 (Septembre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 60 N° 9 (Septembre 2010) . - pp. 667–677 Titre : Measurements of transient ground movements below a ballasted railway line Type de document : texte imprimé Auteurs : J. A. Priest, Auteur ; W. Powrie, Auteur ; L. Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 667–677 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : In  situ  testing  Dynamics  Field  instrumentation  Deformation  Monitoring  Numerical  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the results of a detailed investigation into the ground deformations that occur under a railway line during the passage of a train. Four horizontal boreholes were installed at different depths below a ballasted railway track. Ground deformations were measured using geophones at set distances from the centreline of the track within each borehole. The results show vertical displacements reducing with depth, from a maximum at the sleeper. Sleeper displacements are dominated by pairs of bogies at the ends of adjacent wagons (which have a frequency of loading 1 Hz), although the effects of individual bogies (2 Hz) and axles (6 Hz) are also apparent. Higher loading frequencies attenuate with depth so that at a depth of 0·780 m below the sleeper soffit no axles are visible within the displacement data and by a depth of 1·98 m only the combined effect of pairs of adjacent bogies is apparent. In contrast, longitudinal horizontal motion is greatest at a depth of 0·78 m below the sleeper soffit, and the longitudinal horizontal displacements at the sleeper and at a depth of 0·78 m are dominated by the individual axles (∼6 Hz). By a depth of 1·98 m, the longitudinal horizontal motion is dominated by the bogie pairs. A dynamic linear-elastic two-dimensional finite element model was developed and validated using the measured displacements. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00172 [article] Measurements of transient ground movements below a ballasted railway line [texte imprimé] / J. A. Priest, Auteur ; W. Powrie, Auteur ; L. Yang, Auteur . - 2011 . - pp. 667–677. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 9 (Septembre 2010) . - pp. 667–677 Mots-clés : In  situ  testing  Dynamics  Field  instrumentation  Deformation  Monitoring  Numerical  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the results of a detailed investigation into the ground deformations that occur under a railway line during the passage of a train. Four horizontal boreholes were installed at different depths below a ballasted railway track. Ground deformations were measured using geophones at set distances from the centreline of the track within each borehole. The results show vertical displacements reducing with depth, from a maximum at the sleeper. Sleeper displacements are dominated by pairs of bogies at the ends of adjacent wagons (which have a frequency of loading 1 Hz), although the effects of individual bogies (2 Hz) and axles (6 Hz) are also apparent. Higher loading frequencies attenuate with depth so that at a depth of 0·780 m below the sleeper soffit no axles are visible within the displacement data and by a depth of 1·98 m only the combined effect of pairs of adjacent bogies is apparent. In contrast, longitudinal horizontal motion is greatest at a depth of 0·78 m below the sleeper soffit, and the longitudinal horizontal displacements at the sleeper and at a depth of 0·78 m are dominated by the individual axles (∼6 Hz). By a depth of 1·98 m, the longitudinal horizontal motion is dominated by the bogie pairs. A dynamic linear-elastic two-dimensional finite element model was developed and validated using the measured displacements. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00172