Effects of gas temperature fluctuations on the evolution of nitrogenous species during coal devolatilization / Hongtao Zhang in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2206–2211 Titre : Effects of gas temperature fluctuations on the evolution of nitrogenous species during coal devolatilization Type de document : texte imprimé Auteurs : Hongtao Zhang, Auteur ; Jian Zhang, Auteur Année de publication : 2009 Article en page(s) : p. 2206–2211 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas temperature fluctuations Nitrogenous species Coal Devolatilization Résumé : The effects of gas temperature fluctuations on the instantaneous evolution processes of nitrogenous species were investigated for pulverized coal particles undergoing devolatilization in a hot gas. The instantaneous mass variations of nitrogenous species released from the particles with diameters of 10−50 μm were computed for different conditions. The instantaneous gas temperature was varied with time either in a simple harmonic way or in a random way. The calculated results showed that, under different time-average gas temperatures, the HCN evolution behaviors of particles with different diameters were all affected by the gas temperature fluctuations. The gas temperature fluctuations led to more rapid HCN release from the pulverized coal particles compared to the results obtained without gas temperature fluctuations. The effects were further enhanced by increasing the amplitude or intensity of the gas temperature fluctuations. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801076u [article] Effects of gas temperature fluctuations on the evolution of nitrogenous species during coal devolatilization [texte imprimé] / Hongtao Zhang, Auteur ; Jian Zhang, Auteur . - 2009 . - p. 2206–2211. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2206–2211 Mots-clés : Gas temperature fluctuations Nitrogenous species Coal Devolatilization Résumé : The effects of gas temperature fluctuations on the instantaneous evolution processes of nitrogenous species were investigated for pulverized coal particles undergoing devolatilization in a hot gas. The instantaneous mass variations of nitrogenous species released from the particles with diameters of 10−50 μm were computed for different conditions. The instantaneous gas temperature was varied with time either in a simple harmonic way or in a random way. The calculated results showed that, under different time-average gas temperatures, the HCN evolution behaviors of particles with different diameters were all affected by the gas temperature fluctuations. The gas temperature fluctuations led to more rapid HCN release from the pulverized coal particles compared to the results obtained without gas temperature fluctuations. The effects were further enhanced by increasing the amplitude or intensity of the gas temperature fluctuations. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801076u

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Sharing demand information in competing supply chains with production diseconomies / Albert Y. Ha in Management science, Vol. 57 N° 3 (Mars 2011)  

Public ISBD [article]  inManagement science > Vol. 57 N° 3 (Mars 2011) . - pp. 566-581 Titre : Sharing demand information in competing supply chains with production diseconomies Type de document : texte imprimé Auteurs : Albert Y. Ha, Auteur ; Shilu Tong, Auteur ; Hongtao Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 566-581 Note générale : Management Langues : Anglais (eng) Mots-clés : Supply chain management competition Information sharing Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : This paper studies the incentive for vertical information sharing in competing supply chains with production technologies that exhibit diseconomies of scale. We consider a model of two supply chains each consisting of one manufacturer selling to one retailer, with the retailers engaging in Cournot or Bertrand competition. For Cournot retail competition, we show that information sharing benefits a supply chain when (1) the production diseconomy is large and (2) either competition is less intense or at least one retailer's information is less accurate. A supply chain may become worse off when making its information more accurate or production diseconomy smaller, if such an improvement induces the firms in the rival supply chain to cease sharing information. For Bertrand retail competition, we show that information sharing benefits a supply chain when (1) the production diseconomy is large and (2) either competition is less intense or information is more accurate. Under Bertrand competition a manufacturer may be worse off by receiving information, which is never the case under Cournot competition. Information sharing in one supply chain triggers a competitive reaction from the other supply chain and this reaction is damaging to the first supply chain under Cournot competition but may be beneficial under Bertrand competition. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/cgi/content/abstract/57/3/566 [article] Sharing demand information in competing supply chains with production diseconomies [texte imprimé] / Albert Y. Ha, Auteur ; Shilu Tong, Auteur ; Hongtao Zhang, Auteur . - 2011 . - pp. 566-581. Management Langues : Anglais (eng) in Management science > Vol. 57 N° 3 (Mars 2011) . - pp. 566-581 Mots-clés : Supply chain management competition Information sharing Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : This paper studies the incentive for vertical information sharing in competing supply chains with production technologies that exhibit diseconomies of scale. We consider a model of two supply chains each consisting of one manufacturer selling to one retailer, with the retailers engaging in Cournot or Bertrand competition. For Cournot retail competition, we show that information sharing benefits a supply chain when (1) the production diseconomy is large and (2) either competition is less intense or at least one retailer's information is less accurate. A supply chain may become worse off when making its information more accurate or production diseconomy smaller, if such an improvement induces the firms in the rival supply chain to cease sharing information. For Bertrand retail competition, we show that information sharing benefits a supply chain when (1) the production diseconomy is large and (2) either competition is less intense or information is more accurate. Under Bertrand competition a manufacturer may be worse off by receiving information, which is never the case under Cournot competition. Information sharing in one supply chain triggers a competitive reaction from the other supply chain and this reaction is damaging to the first supply chain under Cournot competition but may be beneficial under Bertrand competition. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/cgi/content/abstract/57/3/566

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