Documents disponibles écrits par cet auteur

Detwinning mechanisms for growth twins in face-centered cubic metals / J. Wang in Acta materialia, Vol. 58 N° 6 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2262–2270 Titre : Detwinning mechanisms for growth twins in face-centered cubic metals Type de document : texte imprimé Auteurs : J. Wang, Auteur ; N. Li, Auteur ; O. Anderoglu, Auteur Année de publication : 2011 Article en page(s) : pp. 2262–2270 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nanotwins  Detwinning  In  situ  TEM  Atomistic  simulations Résumé : Using in situ transmission electron microscopy, we studied the stability of growth twins. We observed the rapid migration of incoherent twin boundaries (ITBs), indicating that nanotwins are unstable. Topological analysis and atomistic simulations are adopted to explore detwinning mechanisms. The results show that: (i) the detwinning process is accomplished via the collective glide of multiple twinning dislocations that form an ITB; (ii) detwinning can easily occur for thin twins, and the driving force is mainly attributed to a variation of the excess energy of a coherent twin boundary; (iii) shear stresses enable ITBs to migrate easily, causing the motion of coherent twin boundaries; and (iv) the migration velocity depends on stacking fault energy. The results imply that detwinning becomes the dominant deformation mechanism for growth twins of the order of a few nanometers thick. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008556 [article] Detwinning mechanisms for growth twins in face-centered cubic metals [texte imprimé] / J. Wang, Auteur ; N. Li, Auteur ; O. Anderoglu, Auteur . - 2011 . - pp. 2262–2270. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2262–2270 Mots-clés : Nanotwins  Detwinning  In  situ  TEM  Atomistic  simulations Résumé : Using in situ transmission electron microscopy, we studied the stability of growth twins. We observed the rapid migration of incoherent twin boundaries (ITBs), indicating that nanotwins are unstable. Topological analysis and atomistic simulations are adopted to explore detwinning mechanisms. The results show that: (i) the detwinning process is accomplished via the collective glide of multiple twinning dislocations that form an ITB; (ii) detwinning can easily occur for thin twins, and the driving force is mainly attributed to a variation of the excess energy of a coherent twin boundary; (iii) shear stresses enable ITBs to migrate easily, causing the motion of coherent twin boundaries; and (iv) the migration velocity depends on stacking fault energy. The results imply that detwinning becomes the dominant deformation mechanism for growth twins of the order of a few nanometers thick. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008556

Dynamic modeling and optimal control of batch reactors, based on structure approaching hybrid neural networks / J. Wang in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6174-6186 Titre : Dynamic modeling and optimal control of batch reactors, based on structure approaching hybrid neural networks Type de document : texte imprimé Auteurs : J. Wang, Auteur ; L. Lin Cao, Auteur ; H. Yan Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 6174-6186 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Neural  network  Reactor  Batchwise  Optimal  control  Modeling  Dynamic  model Résumé : A novel Structure Approaching Hybrid Neural Network (SAHNN) approach to model batch reactors is presented. The Virtual Supervisor-Artificial Immune Algorithm method is utilized for the training of SAHNN, especially for the batch processes with partial unmeasurable state variables. SAHNN involves the use of approximate mechanistic equations to characterize unmeasured state variables. Since the main interest in batch process operation is on the end-of-batch product quality, an extended integral square error control index based on the SAHNN model is applied to track the desired temperature profile of a batch process. This approach introduces model mismatches and unmeasured disturbances into the optimal control strategy and provides a feedback channel for control. The performance of robustness and antidisturbances of the control system are then enhanced. The simulation result indicates that the SAHNN model and model-based optimal control strategy of the batch process are effective. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158916 [article] Dynamic modeling and optimal control of batch reactors, based on structure approaching hybrid neural networks [texte imprimé] / J. Wang, Auteur ; L. Lin Cao, Auteur ; H. Yan Wu, Auteur . - 2011 . - pp. 6174-6186. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6174-6186 Mots-clés : Neural  network  Reactor  Batchwise  Optimal  control  Modeling  Dynamic  model Résumé : A novel Structure Approaching Hybrid Neural Network (SAHNN) approach to model batch reactors is presented. The Virtual Supervisor-Artificial Immune Algorithm method is utilized for the training of SAHNN, especially for the batch processes with partial unmeasurable state variables. SAHNN involves the use of approximate mechanistic equations to characterize unmeasured state variables. Since the main interest in batch process operation is on the end-of-batch product quality, an extended integral square error control index based on the SAHNN model is applied to track the desired temperature profile of a batch process. This approach introduces model mismatches and unmeasured disturbances into the optimal control strategy and provides a feedback channel for control. The performance of robustness and antidisturbances of the control system are then enhanced. The simulation result indicates that the SAHNN model and model-based optimal control strategy of the batch process are effective. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158916

Effect of sodium silicate pretreatment on phosphate layer: Morphology and corrosion resistance behavior / J. Wang in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 317–322 Titre : Effect of sodium silicate pretreatment on phosphate layer: Morphology and corrosion resistance behavior Type de document : texte imprimé Auteurs : J. Wang, Auteur ; W. Zhou, Auteur ; Y. Du, Auteur Année de publication : 2012 Article en page(s) : pp. 317–322 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Phosphating;  pretreatment;  sodium  silicate Résumé : Phosphating is a widely adopted treatment in industry for many purposes. In this paper, carbon steel was pretreated with sodium silicate before phosphating. X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements were used to evaluate the pretreatment effect by sodium silicate on the phosphating layer. The results demonstrate that the phosphate layer pretreated by sodium silicate has a better corrosion resistance as compared with the un-pretreated ones. More compact and uniform coatings composed of finer crystals were obtained with the pretreatment of sodium silicate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005742/abstract [article] Effect of sodium silicate pretreatment on phosphate layer: Morphology and corrosion resistance behavior [texte imprimé] / J. Wang, Auteur ; W. Zhou, Auteur ; Y. Du, Auteur . - 2012 . - pp. 317–322. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 317–322 Mots-clés : Phosphating;  pretreatment;  sodium  silicate Résumé : Phosphating is a widely adopted treatment in industry for many purposes. In this paper, carbon steel was pretreated with sodium silicate before phosphating. X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements were used to evaluate the pretreatment effect by sodium silicate on the phosphating layer. The results demonstrate that the phosphate layer pretreated by sodium silicate has a better corrosion resistance as compared with the un-pretreated ones. More compact and uniform coatings composed of finer crystals were obtained with the pretreatment of sodium silicate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005742/abstract

Experimental study of a two-stage adsorption freezing machine driven by low temperature heat source / J. Wang in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1029–1036 Titre : Experimental study of a two-stage adsorption freezing machine driven by low temperature heat source Titre original : Etude expérimentale effectuée sur un système frigorifique biétagé à adsorption fonctionnant grâce à une source de chaleur à basse température Type de document : texte imprimé Auteurs : J. Wang, Auteur ; L. W. Wang, Auteur ; W. L. Luo, Auteur Année de publication : 2013 Article en page(s) : pp. 1029–1036 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Adsorption  refrigerator;  Composite  adsorbent;  Low-temperature  heat  source;  Freezing Résumé : A novel two-stage adsorption freezing machine, which is powered by the heat source with the temperature below 100 °C was developed. The composite adsorbents of CaCl2 and BaCl2 developed by the matrix of expanded natural graphite were chosen as adsorbents. The performance of the system was tested, and the results showed that the system can generate the refrigerating power at −15 °C for the coolant temperature of 25 °C when the temperature of heat source is as low as 75 °C. For the heat source of 85 °C and the coolant temperature of 25 °C, the optimal coefficient of performance (COP) and specific cooling power (SCP) at −15 °C refrigeration are 0.127 and 100 W kg−1, respectively. COP and SCP increased with the increasing heat source temperature and decreased with the decreasing evaporating temperature; the influence of evaporating temperature is not as significant as that of the regeneration temperature. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002897 [article] Experimental study of a two-stage adsorption freezing machine driven by low temperature heat source = Etude expérimentale effectuée sur un système frigorifique biétagé à adsorption fonctionnant grâce à une source de chaleur à basse température [texte imprimé] / J. Wang, Auteur ; L. W. Wang, Auteur ; W. L. Luo, Auteur . - 2013 . - pp. 1029–1036. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1029–1036 Mots-clés : Adsorption  refrigerator;  Composite  adsorbent;  Low-temperature  heat  source;  Freezing Résumé : A novel two-stage adsorption freezing machine, which is powered by the heat source with the temperature below 100 °C was developed. The composite adsorbents of CaCl2 and BaCl2 developed by the matrix of expanded natural graphite were chosen as adsorbents. The performance of the system was tested, and the results showed that the system can generate the refrigerating power at −15 °C for the coolant temperature of 25 °C when the temperature of heat source is as low as 75 °C. For the heat source of 85 °C and the coolant temperature of 25 °C, the optimal coefficient of performance (COP) and specific cooling power (SCP) at −15 °C refrigeration are 0.127 and 100 W kg−1, respectively. COP and SCP increased with the increasing heat source temperature and decreased with the decreasing evaporating temperature; the influence of evaporating temperature is not as significant as that of the regeneration temperature. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002897

Impact micro-elastohydrodynamics in point contacts / M. Kaneta in Transactions of the ASME . Journal of tribology, Vol. 133 N° 3 (Juillet 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 09 p. Titre : Impact micro-elastohydrodynamics in point contacts Type de document : texte imprimé Auteurs : M. Kaneta, Auteur ; F. Guo, Auteur ; J. Wang, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Deformation  Elastodynamics  Hydrodynamics  Impact  (mechanical)  Lubricating  oils  Lubrication  Mechanical  contact  Micromechanics  Point  contacts Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The influences of a single bump (dent) or regularly arranged bumps (dents) on the film thickness in impact circular elasthydrodynamic lubrication (EHL) contacts lubricated with a Newtonian lubricant are investigated numerically. It has been found that the deformation of the bump or the dent at the contact center depends mainly on the macroscopic pressure distribution produced between the smooth surfaces by impact. The macroscopic pressure distribution is influenced by the initial impact gap, the loading speed, and the mass of the moving body. The central bump or dent hardly deforms when the initial impact gap or the base radius of the bump or dent is small. When the initial impact gap is large and the radius of the base of the central bump is not so small, the oil is entrapped in the bump, and micro-dimple is formed. The deformation of noncentral bumps or dents is mainly influenced by the film profile under conditions of smooth surfaces. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Impact micro-elastohydrodynamics in point contacts [texte imprimé] / M. Kaneta, Auteur ; F. Guo, Auteur ; J. Wang, Auteur . - 2012 . - 09 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 09 p. Mots-clés : Deformation  Elastodynamics  Hydrodynamics  Impact  (mechanical)  Lubricating  oils  Lubrication  Mechanical  contact  Micromechanics  Point  contacts Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The influences of a single bump (dent) or regularly arranged bumps (dents) on the film thickness in impact circular elasthydrodynamic lubrication (EHL) contacts lubricated with a Newtonian lubricant are investigated numerically. It has been found that the deformation of the bump or the dent at the contact center depends mainly on the macroscopic pressure distribution produced between the smooth surfaces by impact. The macroscopic pressure distribution is influenced by the initial impact gap, the loading speed, and the mass of the moving body. The central bump or dent hardly deforms when the initial impact gap or the base radius of the bump or dent is small. When the initial impact gap is large and the radius of the base of the central bump is not so small, the oil is entrapped in the bump, and micro-dimple is formed. The deformation of noncentral bumps or dents is mainly influenced by the film profile under conditions of smooth surfaces. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution / Y. Hu in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Permalink

Research on coating deterioration process under fully immersing condition by using multi-parameters / X. Zhao in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Permalink