Distributed collaborative control for industrial automation with wireless sensor and actuator networks / Jiming, Chen in IEEE transactions on industrial electronics, Vol. 57 N° 12 (Décembre 2010)  

Public ISBD [article]  inIEEE transactions on industrial electronics > Vol. 57 N° 12 (Décembre 2010) . - pp. 4219 - 4230 Titre : Distributed collaborative control for industrial automation with wireless sensor and actuator networks Type de document : texte imprimé Auteurs : Jiming, Chen, Auteur ; Xianghui, Cao, Auteur ; Cheng Peng, Auteur Année de publication : 2011 Article en page(s) : pp. 4219 - 4230 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Distributed collaborative control (DCC) estimation Industrial automation Wireless sensor and actuator networks (WSANs) Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : Wireless sensor and actuator networks (WSANs) bring many benefits to industrial automation systems. When a control system is integrated by a WSAN, and particularly if the network scale is large, distributed communication and control methods are quite necessary. However, unreliable wireless and multihop communications among sensors and actuators cause challenges in designing such systems. This paper proposes and evaluates a new distributed estimation and collaborative control scheme for industrial control systems with WSANs. Extensive results show that the proposed method effectively achieves control objectives and maintains robust against inaccurate system parameters. We also discuss how to dynamically extend the scale of a WSAN with only local adjustments of sensors and actuators. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5416281 [article] Distributed collaborative control for industrial automation with wireless sensor and actuator networks [texte imprimé] / Jiming, Chen, Auteur ; Xianghui, Cao, Auteur ; Cheng Peng, Auteur . - 2011 . - pp. 4219 - 4230. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 12 (Décembre 2010) . - pp. 4219 - 4230 Mots-clés : Distributed collaborative control (DCC) estimation Industrial automation Wireless sensor and actuator networks (WSANs) Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : Wireless sensor and actuator networks (WSANs) bring many benefits to industrial automation systems. When a control system is integrated by a WSAN, and particularly if the network scale is large, distributed communication and control methods are quite necessary. However, unreliable wireless and multihop communications among sensors and actuators cause challenges in designing such systems. This paper proposes and evaluates a new distributed estimation and collaborative control scheme for industrial control systems with WSANs. Extensive results show that the proposed method effectively achieves control objectives and maintains robust against inaccurate system parameters. We also discuss how to dynamically extend the scale of a WSAN with only local adjustments of sensors and actuators. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5416281

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Simulation and analysis of an ethylene slurry polymerization system using supercritical propane / Zhao Xiaojun in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 682-690 Titre : Simulation and analysis of an ethylene slurry polymerization system using supercritical propane Type de document : texte imprimé Auteurs : Zhao Xiaojun, Auteur ; Guo Xiaojun, Auteur ; Cheng Peng, Auteur Année de publication : 2012 Article en page(s) : pp. 682-690 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Supercritical state Polymerization Résumé : In this paper, a model for an ethylene slurry polymerization system using supercritical propane as a solvent is developed by adopting a set of thermodynamic and kinetic parameters using fundamental chemical engineering principles and Polymers Plus software. The Ziegler-Natta catalyst is characterized by assuming the existence of multiple types of catalyst sites and deconvolution data from gel permeation chromatography to determine the most probable chain-length distribution and relative amounts of polymer produced at each site type. A set of suitable reaction subclasses and kinetic constants for different site types that fit plant conditions is developed, validating our model. The values calculated for production rate, ethylene conversion, residence time, H2/C2H4 molar ratio in the reactor, number-average molecular weight, and polydispersity index are all close to actual values, verifying that our model accurately describes plant conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476400 [article] Simulation and analysis of an ethylene slurry polymerization system using supercritical propane [texte imprimé] / Zhao Xiaojun, Auteur ; Guo Xiaojun, Auteur ; Cheng Peng, Auteur . - 2012 . - pp. 682-690. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 682-690 Mots-clés : Supercritical state Polymerization Résumé : In this paper, a model for an ethylene slurry polymerization system using supercritical propane as a solvent is developed by adopting a set of thermodynamic and kinetic parameters using fundamental chemical engineering principles and Polymers Plus software. The Ziegler-Natta catalyst is characterized by assuming the existence of multiple types of catalyst sites and deconvolution data from gel permeation chromatography to determine the most probable chain-length distribution and relative amounts of polymer produced at each site type. A set of suitable reaction subclasses and kinetic constants for different site types that fit plant conditions is developed, validating our model. The values calculated for production rate, ethylene conversion, residence time, H2/C2H4 molar ratio in the reactor, number-average molecular weight, and polydispersity index are all close to actual values, verifying that our model accurately describes plant conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476400

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Why is it necessary to use a damage model to simulate the mechanical behavior of concrete under drying and leaching? / Thomas Rougelot in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 923-935 Titre : Why is it necessary to use a damage model to simulate the mechanical behavior of concrete under drying and leaching? Type de document : texte imprimé Auteurs : Thomas Rougelot, Auteur ; Cheng Peng, Auteur ; Nicolas Burlion, Auteur Année de publication : 2011 Article en page(s) : pp. 923-935 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cementitious materials Drying Leaching Damage X-ray microtomography Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Short and long-term behaviors of concrete structures are of importance when dealing with durability aspects. One particular interesting aspect is the change in microstructure of concrete submitted to drying or leaching processes, and a potentially induced cracking pattern. Experimental investigations which focus on the effect of the dimensions of aggregates over cracks are proposed in this paper. The samples are submitted to accelerated leaching or to drying, and the evolution of their microstructure is regularly recorded by means of X-ray microtomography. A method is then proposed to study the cracking pattern, which appears to be greatly dependant of the size of inclusions. In particular, it appears that a larger diameter of inclusions tends to increase the crack opening. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Why is it necessary to use a damage model to simulate the mechanical behavior of concrete under drying and leaching? [texte imprimé] / Thomas Rougelot, Auteur ; Cheng Peng, Auteur ; Nicolas Burlion, Auteur . - 2011 . - pp. 923-935. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 923-935 Mots-clés : Cementitious materials Drying Leaching Damage X-ray microtomography Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Short and long-term behaviors of concrete structures are of importance when dealing with durability aspects. One particular interesting aspect is the change in microstructure of concrete submitted to drying or leaching processes, and a potentially induced cracking pattern. Experimental investigations which focus on the effect of the dimensions of aggregates over cracks are proposed in this paper. The samples are submitted to accelerated leaching or to drying, and the evolution of their microstructure is regularly recorded by means of X-ray microtomography. A method is then proposed to study the cracking pattern, which appears to be greatly dependant of the size of inclusions. In particular, it appears that a larger diameter of inclusions tends to increase the crack opening. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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