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Comparison study on the adsorption of CFC - 115 and HFC - 125 on activated carbon and silicalite - 1 / Yong Peng in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10009–10015 Titre : Comparison study on the adsorption of CFC - 115 and HFC - 125 on activated carbon and silicalite - 1 Type de document : texte imprimé Auteurs : Yong Peng, Auteur ; Fumin Zhang, Auteur ; Xiao Zheng, Auteur Année de publication : 2011 Article en page(s) : pp. 10009–10015 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption  Activated  carbon  Silicalite Résumé : The adsorption isotherms of CFC-115 (1-chloro-1,1,2,2,2-pentafluoroethane) and HFC-125 (1,1,1,2,2-pentafluoroethane) on Vruf activated carbon (Calgon Carbon Corp.; brand code, VRU-F) and silicalite-1 have been accurately measured at pressures up to 120 kPa and temperatures ranging from 273 to 348 K. The Tóth or dual-site Langmuir (DSL) model appropriately describes the equilibrium data for the adsorptives CFC-115 and HFC-125 on Vruf carbon or silicalite-1, respectively. Because HFC-125 molecule has a higher packing efficiency in the pores of Vruf carbon, its saturation capacity extracted by the Tóth model is higher than that for CFC-115. For CFC-115, a “kink” in the isotherm on silicalite-1 is observed at about 4 molecules (unit cell of silicalite-1)−1, and the measured isotherms of CFC-115 for the first time show a second-step adsorption at loadings over 4 molecules (unit cell)−1. This is ascribed to a large difference in the adsorption entropy between the molecular locations in the intersections and in the channels. The DSL model with fixed saturation capacities describes this behavior well. The mixture adsorption isotherms predicted by the ideal adsorbed solution theory show that both adsorbents could be industrially applicable in the separation of CFC-115 and HFC-125. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010806 [article] Comparison study on the adsorption of CFC - 115 and HFC - 125 on activated carbon and silicalite - 1 [texte imprimé] / Yong Peng, Auteur ; Fumin Zhang, Auteur ; Xiao Zheng, Auteur . - 2011 . - pp. 10009–10015. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10009–10015 Mots-clés : Adsorption  Activated  carbon  Silicalite Résumé : The adsorption isotherms of CFC-115 (1-chloro-1,1,2,2,2-pentafluoroethane) and HFC-125 (1,1,1,2,2-pentafluoroethane) on Vruf activated carbon (Calgon Carbon Corp.; brand code, VRU-F) and silicalite-1 have been accurately measured at pressures up to 120 kPa and temperatures ranging from 273 to 348 K. The Tóth or dual-site Langmuir (DSL) model appropriately describes the equilibrium data for the adsorptives CFC-115 and HFC-125 on Vruf carbon or silicalite-1, respectively. Because HFC-125 molecule has a higher packing efficiency in the pores of Vruf carbon, its saturation capacity extracted by the Tóth model is higher than that for CFC-115. For CFC-115, a “kink” in the isotherm on silicalite-1 is observed at about 4 molecules (unit cell of silicalite-1)−1, and the measured isotherms of CFC-115 for the first time show a second-step adsorption at loadings over 4 molecules (unit cell)−1. This is ascribed to a large difference in the adsorption entropy between the molecular locations in the intersections and in the channels. The DSL model with fixed saturation capacities describes this behavior well. The mixture adsorption isotherms predicted by the ideal adsorbed solution theory show that both adsorbents could be industrially applicable in the separation of CFC-115 and HFC-125. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010806

Robust control of formation dynamics for autonomous underwater vehicles in horizontal plane / Huizhen Yang in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 3 (Mai 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 3 (Mai 2012) . - 07 p. Titre : Robust control of formation dynamics for autonomous underwater vehicles in horizontal plane Type de document : texte imprimé Auteurs : Huizhen Yang, Auteur ; Fumin Zhang, Auteur Année de publication : 2012 Article en page(s) : 07 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Robust  controller  design  Autonomous  underwater  vehicles  Jacobi  transform  Horizontal  dynamics Index. décimale : 629.8 Résumé : This paper presents a novel robust controller design for formation control of autonomous underwater vehicles (AUVs). We consider a nonlinear three-degree-of-freedom dynamic model for the horizontal motion of each AUV. By using the Jacobi transform, the horizontal dynamics of AUVs are explicitly expressed as dynamics for formation shape and formation center, and are further decoupled by feedback control. We treat the coupling terms as perturbations to the decoupled system. An H-infinity state feedback controller is designed to achieve robust stability of the closed loop formation and translation dynamics. By incorporating an orientation controller, the formation shape under control converges and the formation center tracks a desired trajectory simultaneously. Simulation results demonstrate the effectiveness of the controllers. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000003 [...] [article] Robust control of formation dynamics for autonomous underwater vehicles in horizontal plane [texte imprimé] / Huizhen Yang, Auteur ; Fumin Zhang, Auteur . - 2012 . - 07 p. Dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 3 (Mai 2012) . - 07 p. Mots-clés : Robust  controller  design  Autonomous  underwater  vehicles  Jacobi  transform  Horizontal  dynamics Index. décimale : 629.8 Résumé : This paper presents a novel robust controller design for formation control of autonomous underwater vehicles (AUVs). We consider a nonlinear three-degree-of-freedom dynamic model for the horizontal motion of each AUV. By using the Jacobi transform, the horizontal dynamics of AUVs are explicitly expressed as dynamics for formation shape and formation center, and are further decoupled by feedback control. We treat the coupling terms as perturbations to the decoupled system. An H-infinity state feedback controller is designed to achieve robust stability of the closed loop formation and translation dynamics. By incorporating an orientation controller, the formation shape under control converges and the formation center tracks a desired trajectory simultaneously. Simulation results demonstrate the effectiveness of the controllers. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000003 [...]