Documents disponibles écrits par cet auteur

Corrosion behavior of 3C magnesium alloys in simulated sweat solution / F. Wu in Materials and corrosion, Vol. 62 N° 3 (Mars 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 234–239 Titre : Corrosion behavior of 3C magnesium alloys in simulated sweat solution Type de document : texte imprimé Auteurs : F. Wu, Auteur ; S. Zhang, Auteur ; Z. Tao, Auteur Année de publication : 2011 Article en page(s) : pp. 234–239 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  behavior  Magnesium  alloys  Simulated  sweat  solution Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : AZ series Mg alloys AZ31, AZ61, and AZ80 are widely applied in 3C (computer, communication, and consumer electronic) industry. Their corrosion characters in simulated sweat solution have been investigated by electrochemical technology, surface analysis, and pH measurements. Electrochemical test results showed that the three magnesium alloys revealed different corrosion resistance (Rt) in simulated sweat solution, Rt(AZ31) < Rt(AZ61) < Rt(AZ80). Three major components of simulated sweat solution played different roles during corrosion processes. Lactic acid was a kind of strong erosive medium for the magnesium alloys, and NaCl can induce pitting corrosion on alloys surface, while urea acted as a corrosion inhibitor. The corroded surface morphology of the three magnesium alloys was observed using scanning electron microscopy (SEM) and corrosion products were analyzed by X-ray diffraction (XRD). Result of pH measurement tests showed that there were differences in climbing speed and final values of pH for the three magnesium alloys in simulated sweat solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905510/abstract [article] Corrosion behavior of 3C magnesium alloys in simulated sweat solution [texte imprimé] / F. Wu, Auteur ; S. Zhang, Auteur ; Z. Tao, Auteur . - 2011 . - pp. 234–239. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 234–239 Mots-clés : Corrosion  behavior  Magnesium  alloys  Simulated  sweat  solution Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : AZ series Mg alloys AZ31, AZ61, and AZ80 are widely applied in 3C (computer, communication, and consumer electronic) industry. Their corrosion characters in simulated sweat solution have been investigated by electrochemical technology, surface analysis, and pH measurements. Electrochemical test results showed that the three magnesium alloys revealed different corrosion resistance (Rt) in simulated sweat solution, Rt(AZ31) < Rt(AZ61) < Rt(AZ80). Three major components of simulated sweat solution played different roles during corrosion processes. Lactic acid was a kind of strong erosive medium for the magnesium alloys, and NaCl can induce pitting corrosion on alloys surface, while urea acted as a corrosion inhibitor. The corroded surface morphology of the three magnesium alloys was observed using scanning electron microscopy (SEM) and corrosion products were analyzed by X-ray diffraction (XRD). Result of pH measurement tests showed that there were differences in climbing speed and final values of pH for the three magnesium alloys in simulated sweat solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905510/abstract

A portfolio approach to managing procurement risk using multi-stage stochastic programming / Y. Shi in Journal of the operational research society (JORS), Vol. 62 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 11 (Novembre 2011) . - pp. 1958–1970 Titre : A portfolio approach to managing procurement risk using multi-stage stochastic programming Type de document : texte imprimé Auteurs : Y. Shi, Auteur ; F. Wu, Auteur ; L. K. Chu, Auteur Année de publication : 2011 Article en page(s) : pp. 1958–1970 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Portfolio  procurement  approach  Procurement  risk  Risk  mitigation  Stochastic  programming Index. décimale : 001.424 Résumé : Procurement is a critical supply chain management function that is susceptible to risk, due mainly to uncertain customer demand and purchase price volatility. A procurement approach in the form of a portfolio that incorporates the common procurement means is proposed. Such means include long-term contracts, spot procurements and option-based supply contracts. The objective is to explore possible synergies among the various procurement means, and so be able to produce optimal or near optimal results in profit while mitigating risk. The implementation of the portfolio approach is based on a multi-stage stochastic programming model in which replenishment decisions are made at various stages along a time horizon, with replenishment quantities being determined by simultaneously considering the stochastic demand and the price volatility of the spot market. The model attempts to minimise the risk exposure of procurement decisions measured as conditional value-at-risk. Numerical experiments to test the effectiveness of the proposed model are performed using demand data from a large air conditioner manufacturer in China and price volatility data from the Shanghai steel market. The results indicate that the proposed model can fairly reliably outperform other approaches, especially when either the demand and/or prices exhibit significant variability. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n11/abs/jors2010149a.html [article] A portfolio approach to managing procurement risk using multi-stage stochastic programming [texte imprimé] / Y. Shi, Auteur ; F. Wu, Auteur ; L. K. Chu, Auteur . - 2011 . - pp. 1958–1970. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 11 (Novembre 2011) . - pp. 1958–1970 Mots-clés : Portfolio  procurement  approach  Procurement  risk  Risk  mitigation  Stochastic  programming Index. décimale : 001.424 Résumé : Procurement is a critical supply chain management function that is susceptible to risk, due mainly to uncertain customer demand and purchase price volatility. A procurement approach in the form of a portfolio that incorporates the common procurement means is proposed. Such means include long-term contracts, spot procurements and option-based supply contracts. The objective is to explore possible synergies among the various procurement means, and so be able to produce optimal or near optimal results in profit while mitigating risk. The implementation of the portfolio approach is based on a multi-stage stochastic programming model in which replenishment decisions are made at various stages along a time horizon, with replenishment quantities being determined by simultaneously considering the stochastic demand and the price volatility of the spot market. The model attempts to minimise the risk exposure of procurement decisions measured as conditional value-at-risk. Numerical experiments to test the effectiveness of the proposed model are performed using demand data from a large air conditioner manufacturer in China and price volatility data from the Shanghai steel market. The results indicate that the proposed model can fairly reliably outperform other approaches, especially when either the demand and/or prices exhibit significant variability. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n11/abs/jors2010149a.html