Documents disponibles écrits par cet auteur

Development of a Scalable Power Semiconductor Switch (SPSS) / Wang, Hongfang in IEEE transactions on power electronics, Vol. 22 N°2 (Mars 2007)

Public ISBD [article]  in IEEE transactions on power electronics > Vol. 22 N°2 (Mars 2007) . - 364-373 p. Titre : Development of a Scalable Power Semiconductor Switch (SPSS) Titre original : Développement d'un commutateur de semi-conducteur de puissance de Scalable (SPSS) Type de document : texte imprimé Auteurs : Wang, Hongfang, Auteur ; Huang, Alex Q., Auteur ; Wang, Fei, Auteur Article en page(s) : 364-373 p. Note générale : Electronique Langues : Anglais (eng) Mots-clés : High  frequency  Switch  High  voltage  switich  Series  connection  Voltage  balance Index. décimale : 621.31 Production,approvisionnement et contrôle de l'électricité.Machines et appareils électriques.Mesure électrique.Magnétisme et électrostatique appliquées Résumé : This paper presents the design and development of a 4800-V, 300-A, 10-kHz scalable power semiconductor switch (SPSS) based on series connecting low voltage insulated gate bipolar transistors (IGBTs). The static and dynamic voltage balance among IGBTs is achieved using a hybrid approach of active clamp circuit and an active gate control that is also effective during tail current phase. The developed SPSS derives its control power directly from the main power bus. Control, packaging, and thermal characteristics are an integral part of the SPSS design. From a user's standpoint, the SPSS is a three-terminal optically controlled high-power switch. Experimental evaluation of the prototype SPSS shows it fully achieved the design objectives. In principle, the approach can be extended to building switches with higher voltages, currents, and switching frequencies, or even with other types of devices than IGBTs. Cet article présente la conception et le développement d'un 4800-V, 300-A, le commutateur scalable de semi-conducteur de la puissance 10-kHz (SPSS) basé sur la série reliant les transistors bipolaires isolés de porte de basse tension (IGBTs). L'équilibre statique et dynamique de tension parmi IGBTs est réalisé en utilisant une approche hybride de circuit actif de bride et d'une commande active de porte qui est également efficace pendant la phase de courant de queue. Le SPSS développé dérive sa puissance de commande directement de l'autobus de puissance principale. La commande, l'empaquetage, et les caractéristiques thermiques sont une partie intégrale de la conception de SPSS. Du point de vue d'un utilisateur, le SPSS est un commutateur de haute puissance à commande optique de trois-borne. Évaluation expérimentale des expositions du prototype SPSS il a entièrement atteint les objectifs de conception. En principe, l'approche peut être prolongée aux commutateurs de bâtiment avec des tensions, des courants, et des fréquences plus élevés de commutation, ou même avec d'autres types de dispositifs qu'IGBTs. DEWEY : 621 ISSN : 0885-8993 RAMEAU : Commutation (électricité)-- Semiconducteurs [article] Development of a Scalable Power Semiconductor Switch (SPSS) = Développement d'un commutateur de semi-conducteur de puissance de Scalable (SPSS) [texte imprimé] / Wang, Hongfang, Auteur ; Huang, Alex Q., Auteur ; Wang, Fei, Auteur . - 364-373 p. Electronique Langues : Anglais (eng) in IEEE transactions on power electronics > Vol. 22 N°2 (Mars 2007) . - 364-373 p. Mots-clés : High  frequency  Switch  High  voltage  switich  Series  connection  Voltage  balance Index. décimale : 621.31 Production,approvisionnement et contrôle de l'électricité.Machines et appareils électriques.Mesure électrique.Magnétisme et électrostatique appliquées Résumé : This paper presents the design and development of a 4800-V, 300-A, 10-kHz scalable power semiconductor switch (SPSS) based on series connecting low voltage insulated gate bipolar transistors (IGBTs). The static and dynamic voltage balance among IGBTs is achieved using a hybrid approach of active clamp circuit and an active gate control that is also effective during tail current phase. The developed SPSS derives its control power directly from the main power bus. Control, packaging, and thermal characteristics are an integral part of the SPSS design. From a user's standpoint, the SPSS is a three-terminal optically controlled high-power switch. Experimental evaluation of the prototype SPSS shows it fully achieved the design objectives. In principle, the approach can be extended to building switches with higher voltages, currents, and switching frequencies, or even with other types of devices than IGBTs. Cet article présente la conception et le développement d'un 4800-V, 300-A, le commutateur scalable de semi-conducteur de la puissance 10-kHz (SPSS) basé sur la série reliant les transistors bipolaires isolés de porte de basse tension (IGBTs). L'équilibre statique et dynamique de tension parmi IGBTs est réalisé en utilisant une approche hybride de circuit actif de bride et d'une commande active de porte qui est également efficace pendant la phase de courant de queue. Le SPSS développé dérive sa puissance de commande directement de l'autobus de puissance principale. La commande, l'empaquetage, et les caractéristiques thermiques sont une partie intégrale de la conception de SPSS. Du point de vue d'un utilisateur, le SPSS est un commutateur de haute puissance à commande optique de trois-borne. Évaluation expérimentale des expositions du prototype SPSS il a entièrement atteint les objectifs de conception. En principe, l'approche peut être prolongée aux commutateurs de bâtiment avec des tensions, des courants, et des fréquences plus élevés de commutation, ou même avec d'autres types de dispositifs qu'IGBTs. DEWEY : 621 ISSN : 0885-8993 RAMEAU : Commutation (électricité)-- Semiconducteurs

Electrical capacitance volume tomography imaging of three - dimensional flow structures and solids concentration distributions in a riser and a bend of a gas – solid circulating fluidized bed / Wang, Fei in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10968-10976 Titre : Electrical capacitance volume tomography imaging of three - dimensional flow structures and solids concentration distributions in a riser and a bend of a gas – solid circulating fluidized bed Type de document : texte imprimé Auteurs : Wang, Fei, Auteur ; Qussai Marashdeh, Auteur ; Aining Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 10968-10976 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Circulating  fluidized  bed  Fluidization  Gas  solid  Riser  Concentration  distribution  Three  dimensional  flow  Imaging  Tomography  Capacitance Résumé : Electrical capacitance volume tomography (ECVT) is a newly developed imaging technique that can quantify three-dimensional (3D) multiphase flows in a complex, geometric flow field. In this study, the 3D phase distribution images inside a gas―solid circulating fluidized bed (CFB) are obtained using ECVT. Specifically, measurements are made at a riser section and a 90° bend-shape riser exit section of the CFB. Inside the vertical riser, a symmetric core―annulus structure with a low solids holdup in the riser center along with a high solids holdup near the riser wall is observed. The average volume solids holdup and the thickness of the annulus decrease with the superficial gas velocity. A core―annulus flow structure is formed both in the vertical and horizontal parts of the bend. The annulus structure is noncentro-symmetric in the horizontal part of the bend. The solids holdup in the annulus near the top wall area in the bend is higher than that in other locations of the annulus. At a higher superficial gas velocity in the riser, the centrifugal acceleration increases due to high solids velocity in the bend, and more solids are separated to the outside of the bend from the main stream. A "reversed-S" shape solids holdup distribution along the diagonal line is also observed. The solids holdup increases and then decreases from the outer comer to the center of the bend, which indicates that a relatively dilute region is formed near the outer corner of the bend. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286471 [article] Electrical capacitance volume tomography imaging of three - dimensional flow structures and solids concentration distributions in a riser and a bend of a gas – solid circulating fluidized bed [texte imprimé] / Wang, Fei, Auteur ; Qussai Marashdeh, Auteur ; Aining Wang, Auteur . - 2012 . - pp. 10968-10976. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10968-10976 Mots-clés : Circulating  fluidized  bed  Fluidization  Gas  solid  Riser  Concentration  distribution  Three  dimensional  flow  Imaging  Tomography  Capacitance Résumé : Electrical capacitance volume tomography (ECVT) is a newly developed imaging technique that can quantify three-dimensional (3D) multiphase flows in a complex, geometric flow field. In this study, the 3D phase distribution images inside a gas―solid circulating fluidized bed (CFB) are obtained using ECVT. Specifically, measurements are made at a riser section and a 90° bend-shape riser exit section of the CFB. Inside the vertical riser, a symmetric core―annulus structure with a low solids holdup in the riser center along with a high solids holdup near the riser wall is observed. The average volume solids holdup and the thickness of the annulus decrease with the superficial gas velocity. A core―annulus flow structure is formed both in the vertical and horizontal parts of the bend. The annulus structure is noncentro-symmetric in the horizontal part of the bend. The solids holdup in the annulus near the top wall area in the bend is higher than that in other locations of the annulus. At a higher superficial gas velocity in the riser, the centrifugal acceleration increases due to high solids velocity in the bend, and more solids are separated to the outside of the bend from the main stream. A "reversed-S" shape solids holdup distribution along the diagonal line is also observed. The solids holdup increases and then decreases from the outer comer to the center of the bend, which indicates that a relatively dilute region is formed near the outer corner of the bend. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286471

Experimental and numerical studies of water droplet impact on a porous surface in the film-Boiling regime / Zhao Yu in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9174–9182 Titre : Experimental and numerical studies of water droplet impact on a porous surface in the film-Boiling regime Type de document : texte imprimé Auteurs : Zhao Yu, Auteur ; Wang, Fei, Auteur ; L.-S. Fan, Auteur Année de publication : 2009 Article en page(s) : p. 9174–9182 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Experimental  and  Numerical  Studies  Water  Droplet  Film-Boiling  Regime Résumé : An experimental and numerical study of the water droplet in collision with a porous surface in the film-boiling regime is reported. The porous substrate with a porosity of 34% and pore size of 76 nm is heated to 300 °C, and the motion of the droplet is recorded by a high-speed digital camera. A new three-dimensional (3-D) numerical model is developed to account for the transport phenomenon both inside and outside the porous media, by coupling the flow field with the heat and mass transfer process. The vapor layer model is used as a subgrid model to calculate the induced vapor pressure in the narrow region between the droplet and the surface. The vapor mass transfer is modeled considering the vapor generation and transport mechanisms in different domains. Direct numerical simulation is performed under the same conditions as the experiment, and the simulation results for the droplet behavior are in good agreement with the experimental results. The collision of a water droplet on the porous surface shows similar features to those on nonporous surfaces in the film-boiling regime, probably because of the small pore size of the material used in the current study. However, the droplet has a longer residence time, and it also seems to be less stable on the porous surface. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800479r [article] Experimental and numerical studies of water droplet impact on a porous surface in the film-Boiling regime [texte imprimé] / Zhao Yu, Auteur ; Wang, Fei, Auteur ; L.-S. Fan, Auteur . - 2009 . - p. 9174–9182. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9174–9182 Mots-clés : Experimental  and  Numerical  Studies  Water  Droplet  Film-Boiling  Regime Résumé : An experimental and numerical study of the water droplet in collision with a porous surface in the film-boiling regime is reported. The porous substrate with a porosity of 34% and pore size of 76 nm is heated to 300 °C, and the motion of the droplet is recorded by a high-speed digital camera. A new three-dimensional (3-D) numerical model is developed to account for the transport phenomenon both inside and outside the porous media, by coupling the flow field with the heat and mass transfer process. The vapor layer model is used as a subgrid model to calculate the induced vapor pressure in the narrow region between the droplet and the surface. The vapor mass transfer is modeled considering the vapor generation and transport mechanisms in different domains. Direct numerical simulation is performed under the same conditions as the experiment, and the simulation results for the droplet behavior are in good agreement with the experimental results. The collision of a water droplet on the porous surface shows similar features to those on nonporous surfaces in the film-boiling regime, probably because of the small pore size of the material used in the current study. However, the droplet has a longer residence time, and it also seems to be less stable on the porous surface. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800479r

Parasitic effects of grounding paths on common-mode EMI filter's performance in power electronics systems / Shuo, Wang in IEEE transactions on industrial electronics, Vol. 57 N° 9 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 57 N° 9 (Septembre 2010) . - pp. 3050 - 3059 Titre : Parasitic effects of grounding paths on common-mode EMI filter's performance in power electronics systems Type de document : texte imprimé Auteurs : Shuo, Wang, Auteur ; Maillet, Yoann Yorrick, Auteur ; Wang, Fei, Auteur Année de publication : 2011 Article en page(s) : pp. 3050 - 3059 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Electromagnetic-interference  (EMI)  filter  Grounding  Inductive  coupling  Motor  drive  Mutual  inductance  Parasitic Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : High-frequency common-mode (CM) electromagnetic-interference (EMI) noise is difficult to suppress in electronics systems. EMI filters are used to suppress CM noise, but their performance is greatly affected by the parasitic effects of the grounding paths. In this paper, the parasitic effects of the grounding paths on an EMI filter's performance are investigated in a motor-drive system. The effects of the mutual inductance between two grounding paths are explored. Guidelines for the grounding of CM EMI filters are derived. Simulations and experiments are finally carried out to verify the theoretical analysis. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5345721 [article] Parasitic effects of grounding paths on common-mode EMI filter's performance in power electronics systems [texte imprimé] / Shuo, Wang, Auteur ; Maillet, Yoann Yorrick, Auteur ; Wang, Fei, Auteur . - 2011 . - pp. 3050 - 3059. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 9 (Septembre 2010) . - pp. 3050 - 3059 Mots-clés : Electromagnetic-interference  (EMI)  filter  Grounding  Inductive  coupling  Motor  drive  Mutual  inductance  Parasitic Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : High-frequency common-mode (CM) electromagnetic-interference (EMI) noise is difficult to suppress in electronics systems. EMI filters are used to suppress CM noise, but their performance is greatly affected by the parasitic effects of the grounding paths. In this paper, the parasitic effects of the grounding paths on an EMI filter's performance are investigated in a motor-drive system. The effects of the mutual inductance between two grounding paths are explored. Guidelines for the grounding of CM EMI filters are derived. Simulations and experiments are finally carried out to verify the theoretical analysis. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5345721

Removal of perchlorate from aqueous solution using protonated cross-linked chitosan / Yanhua Xie in Chemical engineering journal, Vol. 156 N° 1 (Janvier 2010) 

Public ISBD [article]  in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 56-63 Titre : Removal of perchlorate from aqueous solution using protonated cross-linked chitosan Type de document : texte imprimé Auteurs : Yanhua Xie, Auteur ; Shiyu Li, Auteur ; Wang, Fei, Auteur Année de publication : 2010 Article en page(s) : pp. 56-63 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Protonated  cross-linked  chitosan  Perchlorate  Adsorption  Regeneration Index. décimale : 660 Résumé : Protonated cross-linked chitosan was used to remove perchlorate from aqueous solution. Adsorption isotherms, the effects of pH and co-existing anions on the adsorption process, proper actual contact time in the adsorption column and the regeneration ability of the adsorbent were investigated. The equilibrium data fitted well with Langmuir and Freundlich isotherm models, and the maximum monolayer adsorption capacity was 45.455 mg g−1. To balance the protonated degree of the amino groups and the effect of the ion competing on adsorption capacity, the optimal pH value was determined to be about 4.0. Column adsorption results indicated that the proper actual contact time was 8.1 min and the effluent perchlorate could be steadily kept below 24.5 μg L−1 up to about 95 bed volumes with the influent perchlorate of 10 mg L−1. The presence of other anions weakened the perchlorate adsorption, especially the high valence anion such as sulfate. The adsorbents could be well regenerated by sodium hydroxide solution with pH 12 and reused at least for 15 cycles. Electrostatic attraction as well as physical force was the main driving force for perchlorate adsorption. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-9&_user=6 [...] [article] Removal of perchlorate from aqueous solution using protonated cross-linked chitosan [texte imprimé] / Yanhua Xie, Auteur ; Shiyu Li, Auteur ; Wang, Fei, Auteur . - 2010 . - pp. 56-63. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 56-63 Mots-clés : Protonated  cross-linked  chitosan  Perchlorate  Adsorption  Regeneration Index. décimale : 660 Résumé : Protonated cross-linked chitosan was used to remove perchlorate from aqueous solution. Adsorption isotherms, the effects of pH and co-existing anions on the adsorption process, proper actual contact time in the adsorption column and the regeneration ability of the adsorbent were investigated. The equilibrium data fitted well with Langmuir and Freundlich isotherm models, and the maximum monolayer adsorption capacity was 45.455 mg g−1. To balance the protonated degree of the amino groups and the effect of the ion competing on adsorption capacity, the optimal pH value was determined to be about 4.0. Column adsorption results indicated that the proper actual contact time was 8.1 min and the effluent perchlorate could be steadily kept below 24.5 μg L−1 up to about 95 bed volumes with the influent perchlorate of 10 mg L−1. The presence of other anions weakened the perchlorate adsorption, especially the high valence anion such as sulfate. The adsorbents could be well regenerated by sodium hydroxide solution with pH 12 and reused at least for 15 cycles. Electrostatic attraction as well as physical force was the main driving force for perchlorate adsorption. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-9&_user=6 [...]

Soot optical properties in the terahertz spectra domain / Wang, Fei in Journal of heat transfer, Vol. 134 N° 7 (Juillet 2012) 

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