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Auteur Wei Wang |
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Ajouter le résultat dans votre panier Faire une suggestion Affiner la rechercheApplication of bifunctional ionic liquid extractants [A336][CA-12] and [A336][CA-100] to the lanthanum extraction and separation from rare earths in the chloride medium / Wei Wang in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011)
Titre : Application of bifunctional ionic liquid extractants [A336][CA-12] and [A336][CA-100] to the lanthanum extraction and separation from rare earths in the chloride medium Type de document : texte imprimé Auteurs : Wei Wang, Auteur ; Hualing Yang, Auteur ; Hongmin Cui, Auteur Année de publication : 2011 Article en page(s) : pp. 7534-7541 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic liquid Résumé : In this Article, bifunctional ionic liquid extractants (Bif-ILEs) tricaprylmethylammonium sec-octylphenoxy acetic acid ([A366][CA-12]) and tricaprylmethylammonium sec-nonylphenoxy acetic acid ([A336][CA-100]) used for the rare earths (REs) extraction from the chloride medium have been investigated. The effects of extractants concentration, equilibrium pH of aqueous phase, salt concentration, temperature, etc., were discussed. The results show that the extraction ability of [A336][CA-12] and [A336] [CA-100] is higher than that of the conventional extractants sec-octylphenoxy acetic acid (CA-12), sec-nonylphenoxy acetic acid (CA-100), tri-n-butyl phosphate (TBP), and di-(1-metylheptyl)methyl phosphate (P350) under the same conditions. Furthermore, in the [A336][CA-12] system, the separation factors (β) between La(III) and other REs(III) are higher than 6.0, which indicates that [A336][CA-12] would be suitable for the La(III) extraction and separation. The extraction mechanism is also proposed, and there is a similar extraction tendency in both the [A336][CA-12] and the [A336][CA-100] systems. The loaded organic phase is easy to strip; more than 95% La(III) could be stripped from the loaded organic phase when the stripping acidity is higher than 0.03 M. The recycling experiments also indicate that the two extraction systems could be recycled without loss of the extraction efficiency. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239070
in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7534-7541[article] Application of bifunctional ionic liquid extractants [A336][CA-12] and [A336][CA-100] to the lanthanum extraction and separation from rare earths in the chloride medium [texte imprimé] / Wei Wang, Auteur ; Hualing Yang, Auteur ; Hongmin Cui, Auteur . - 2011 . - pp. 7534-7541.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7534-7541
Mots-clés : Ionic liquid Résumé : In this Article, bifunctional ionic liquid extractants (Bif-ILEs) tricaprylmethylammonium sec-octylphenoxy acetic acid ([A366][CA-12]) and tricaprylmethylammonium sec-nonylphenoxy acetic acid ([A336][CA-100]) used for the rare earths (REs) extraction from the chloride medium have been investigated. The effects of extractants concentration, equilibrium pH of aqueous phase, salt concentration, temperature, etc., were discussed. The results show that the extraction ability of [A336][CA-12] and [A336] [CA-100] is higher than that of the conventional extractants sec-octylphenoxy acetic acid (CA-12), sec-nonylphenoxy acetic acid (CA-100), tri-n-butyl phosphate (TBP), and di-(1-metylheptyl)methyl phosphate (P350) under the same conditions. Furthermore, in the [A336][CA-12] system, the separation factors (β) between La(III) and other REs(III) are higher than 6.0, which indicates that [A336][CA-12] would be suitable for the La(III) extraction and separation. The extraction mechanism is also proposed, and there is a similar extraction tendency in both the [A336][CA-12] and the [A336][CA-100] systems. The loaded organic phase is easy to strip; more than 95% La(III) could be stripped from the loaded organic phase when the stripping acidity is higher than 0.03 M. The recycling experiments also indicate that the two extraction systems could be recycled without loss of the extraction efficiency. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239070 Exemplaires
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Titre : Design and implementation of modular FPGA-based PID controllers Titre original : Conception et exécution des contrôleurs FPGA-basés modulaires de PID Type de document : texte imprimé Auteurs : Chan, Yuen Fong, Auteur ; M. Moallem, Auteur ; Wei Wang, Auteur Année de publication : 2007 Article en page(s) : 1898-1906 p. Note générale : Electronique Langues : Anglais (eng) Mots-clés : Distributed arithmetic (DA) Embedded controllers Field-programmable gate arrays (FPGAs) design Power and speed optimization Proportional-integral-derivative (PID) controller Arithmétique distribuée Contrôleurs incorporés Conception programmable de rangées porte champ Optimisation puissance et vitesse Contrôleur dérivé intégral proportionnel Index. décimale : 621 Ingénierie mécanique en général. Technologie nucléaire. Ingénierie électrique. Machinerie Résumé : In this paper, modular design of embedded feedback controllers using field-programmable gate array (FPGA) technology is studied. To this end, a novel distributed-arithmetic (DA)-based proportional–integral–derivative (PID) controller algorithm is proposed and integrated into a digital feedback control system. The DA-based PID controller demonstrates 80% savings in hardware utilization and 40% savings in power consumption compared to the multiplier-based scheme. It also offers good closed-loop performance while using less resources, resulting in cost reduction, high speed, and low power consumption, which is desirable in embedded control applications. The complete digital control system is built using commercial FPGAs to demonstrate the efficiency. The design uses a modular approach, so that some modules can be reused in other applications. These reusable modules can be ported into Matlab/Simulink as Simulink blocks for hardware/software cosimulation or integrated into a larger design in the Matlab/Simulink environment to allow for rapid prototyping applications.
Dans cette conception de papier et modulaire des contrôleurs incorporés de rétroaction employant la technologie programmable de la rangée de porte de champ (FPGA) est étudié. À cet effet, un roman a distribué l'arithmétique (DA) - le contrôleur (PID) dérivé intégral proportionnel basé que l'algorithme est proposé et intégré dans un système de commande numérique de rétroaction. Le contrôleur DA-basé de PID démontre l'épargne de 80% dans l'utilisation de matériel et l'épargne de 40% dans la puissance d'énergie comparée à l'arrangement multiplicateur-basé. Il offre également la bonne exécution de boucle bloquée tout en en utilisant moins de ressources, ayant pour résultat la réduction des coûts, la vitesse, et la consommation de basse puissance, qui est souhaitable dans des applications incluses de commande. Le système complet de commande numérique est établi en utilisant FPGAs commercial pour démontrer l'efficacité. La conception emploie une approche modulaire, de sorte que quelques modules puissent être réutilisés dans d'autres applications. Ces modules réutilisables peuvent être mis en communication dans Matlab/Simulink comme blocs de Simulink pour le cosimulation de matériel/logiciel ou être intégrés dans une plus grande conception dans l'environnement de Matlab/Simulink pour tenir compte des applications rapides de prototypage.DEWEY : 621 ISSN : 0278-0046 RAMEAU : Rétroaction (électronique) En ligne : mmoallem@sfu.ca
in IEEE transactions on industrial electronics > Vol. 54 N°4 (Août 2007) . - 1898-1906 p.[article] Design and implementation of modular FPGA-based PID controllers = Conception et exécution des contrôleurs FPGA-basés modulaires de PID [texte imprimé] / Chan, Yuen Fong, Auteur ; M. Moallem, Auteur ; Wei Wang, Auteur . - 2007 . - 1898-1906 p.
Electronique
Langues : Anglais (eng)
in IEEE transactions on industrial electronics > Vol. 54 N°4 (Août 2007) . - 1898-1906 p.
Mots-clés : Distributed arithmetic (DA) Embedded controllers Field-programmable gate arrays (FPGAs) design Power and speed optimization Proportional-integral-derivative (PID) controller Arithmétique distribuée Contrôleurs incorporés Conception programmable de rangées porte champ Optimisation puissance et vitesse Contrôleur dérivé intégral proportionnel Index. décimale : 621 Ingénierie mécanique en général. Technologie nucléaire. Ingénierie électrique. Machinerie Résumé : In this paper, modular design of embedded feedback controllers using field-programmable gate array (FPGA) technology is studied. To this end, a novel distributed-arithmetic (DA)-based proportional–integral–derivative (PID) controller algorithm is proposed and integrated into a digital feedback control system. The DA-based PID controller demonstrates 80% savings in hardware utilization and 40% savings in power consumption compared to the multiplier-based scheme. It also offers good closed-loop performance while using less resources, resulting in cost reduction, high speed, and low power consumption, which is desirable in embedded control applications. The complete digital control system is built using commercial FPGAs to demonstrate the efficiency. The design uses a modular approach, so that some modules can be reused in other applications. These reusable modules can be ported into Matlab/Simulink as Simulink blocks for hardware/software cosimulation or integrated into a larger design in the Matlab/Simulink environment to allow for rapid prototyping applications.
Dans cette conception de papier et modulaire des contrôleurs incorporés de rétroaction employant la technologie programmable de la rangée de porte de champ (FPGA) est étudié. À cet effet, un roman a distribué l'arithmétique (DA) - le contrôleur (PID) dérivé intégral proportionnel basé que l'algorithme est proposé et intégré dans un système de commande numérique de rétroaction. Le contrôleur DA-basé de PID démontre l'épargne de 80% dans l'utilisation de matériel et l'épargne de 40% dans la puissance d'énergie comparée à l'arrangement multiplicateur-basé. Il offre également la bonne exécution de boucle bloquée tout en en utilisant moins de ressources, ayant pour résultat la réduction des coûts, la vitesse, et la consommation de basse puissance, qui est souhaitable dans des applications incluses de commande. Le système complet de commande numérique est établi en utilisant FPGAs commercial pour démontrer l'efficacité. La conception emploie une approche modulaire, de sorte que quelques modules puissent être réutilisés dans d'autres applications. Ces modules réutilisables peuvent être mis en communication dans Matlab/Simulink comme blocs de Simulink pour le cosimulation de matériel/logiciel ou être intégrés dans une plus grande conception dans l'environnement de Matlab/Simulink pour tenir compte des applications rapides de prototypage.DEWEY : 621 ISSN : 0278-0046 RAMEAU : Rétroaction (électronique) En ligne : mmoallem@sfu.ca Exemplaires
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Titre : Guaranteed cost control for networked control systems based on an improved predictive control method Type de document : texte imprimé Auteurs : Rui, Wang, Auteur ; Liu, Guo-Ping, Auteur ; Wei Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 1226-1232 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Guaranteed cost control Linear matrix inequalities (LMIs) Networked system (NCS) Predictive Switched systems Index. décimale : 629.1 Résumé : This brief deals with the problem of guaranteed cost control for a class of uncertain networked control systems with time-varying delay. An improved predictive controller design strategy is proposed to compensate for the delay and data dropout in both the forward and backward channels to achieve the desired control performance. The varying controller gains which are designed to vary with delays can lead to less conservative results. Meanwhile, an algorithm involving a convex optimization problem is presented to achieve a suboptimal guaranteed cost. Furthermore, a numerical simulation and a practical experiment are given to illustrate the effectiveness of the proposed method.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5352229
in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1226-1232[article] Guaranteed cost control for networked control systems based on an improved predictive control method [texte imprimé] / Rui, Wang, Auteur ; Liu, Guo-Ping, Auteur ; Wei Wang, Auteur . - 2011 . - pp. 1226-1232.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1226-1232
Mots-clés : Guaranteed cost control Linear matrix inequalities (LMIs) Networked system (NCS) Predictive Switched systems Index. décimale : 629.1 Résumé : This brief deals with the problem of guaranteed cost control for a class of uncertain networked control systems with time-varying delay. An improved predictive controller design strategy is proposed to compensate for the delay and data dropout in both the forward and backward channels to achieve the desired control performance. The varying controller gains which are designed to vary with delays can lead to less conservative results. Meanwhile, an algorithm involving a convex optimization problem is presented to achieve a suboptimal guaranteed cost. Furthermore, a numerical simulation and a practical experiment are given to illustrate the effectiveness of the proposed method.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5352229 Exemplaires
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Titre : H [infinity] control for networked predictive control systems based on the switched Lyapunov function method Type de document : texte imprimé Auteurs : Rui, Wang, Auteur ; Liu, Guo-Ping, Auteur ; Wei Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 3565 - 3571 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : H[infinity] control Networked systems (NCSs) Predictive Switched Lyapunov function Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper investigates the problem of H∞ control for a class of networked control systems (NCSs) with time-varying delay in both forward and backward channels. Combined with the switched Lyapunov function technique, an improved predictive controller design strategy is proposed to compensate for the delay and data dropout to achieve the desired control performance. Based on these methods, the controllers can be designed to guarantee that the closed-loop system is asymptotically stable with an H∞-norm bound in terms of nonlinear matrix inequalities. An iterative algorithm is presented to solve these nonlinear matrix inequalities to obtain a suboptimal minimum disturbance attenuation level. Numerical simulations and a practical experiment are given to illustrate the effectiveness of the proposed method. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5371853
in IEEE transactions on industrial electronics > Vol. 57 N° 10 (Octobre 2010) . - pp. 3565 - 3571[article] H [infinity] control for networked predictive control systems based on the switched Lyapunov function method [texte imprimé] / Rui, Wang, Auteur ; Liu, Guo-Ping, Auteur ; Wei Wang, Auteur . - 2011 . - pp. 3565 - 3571.
Génie électrique
Langues : Anglais (eng)
in IEEE transactions on industrial electronics > Vol. 57 N° 10 (Octobre 2010) . - pp. 3565 - 3571
Mots-clés : H[infinity] control Networked systems (NCSs) Predictive Switched Lyapunov function Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper investigates the problem of H∞ control for a class of networked control systems (NCSs) with time-varying delay in both forward and backward channels. Combined with the switched Lyapunov function technique, an improved predictive controller design strategy is proposed to compensate for the delay and data dropout to achieve the desired control performance. Based on these methods, the controllers can be designed to guarantee that the closed-loop system is asymptotically stable with an H∞-norm bound in terms of nonlinear matrix inequalities. An iterative algorithm is presented to solve these nonlinear matrix inequalities to obtain a suboptimal minimum disturbance attenuation level. Numerical simulations and a practical experiment are given to illustrate the effectiveness of the proposed method. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5371853 Exemplaires
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Titre : Morphology and catalytic performance of flake - shaped NiO - yttria - stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains Type de document : texte imprimé Auteurs : Yuzhou Wu, Auteur ; Wei Wang, Auteur ; Kun Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 6387-6394 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalytic reaction Morphology Résumé : The flake-shaped NiO-yttria-stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains were synthesized using the sucrose-concentrated H2SO4, dehydration reaction, and their microstructure was characterized by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). To evaluate the properties of the flakeshaped NiO-YSZ particles as the anode materials for solid oxide fuel cells, the reduction temperature of the flake-shaped NiO-YSZ particles and catalytic activity on the methane steam/CO2 reforming reactions of the H2-reduced particles as well as the electrochemical impedance spectra of the YSZ supported symmetrical cells with the electrodes made from these particles were examined in comparison with the mixed commercial NiO-YSZ. HRTEM revealed that the nanocrystalline YSZ was dispersed in the NiO matrix and distributed on the surface of the flake-shaped NiO-YSZ particles. The catalytic performance of the flake-shaped NiO-YSZ particles was better than that of the mixed commercial NiO-YSZ in both steam reforming and CO2 reforming of methane. The symmetrical cell made from the flake-shaped NiO-YSZ exhibited a much lower polarization resistance at the operating temperatures below 800 °C than that made from the mixed commercial NiO-YSZ. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867290
in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6387-6394[article] Morphology and catalytic performance of flake - shaped NiO - yttria - stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains [texte imprimé] / Yuzhou Wu, Auteur ; Wei Wang, Auteur ; Kun Wang, Auteur . - 2012 . - pp. 6387-6394.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6387-6394
Mots-clés : Catalytic reaction Morphology Résumé : The flake-shaped NiO-yttria-stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains were synthesized using the sucrose-concentrated H2SO4, dehydration reaction, and their microstructure was characterized by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). To evaluate the properties of the flakeshaped NiO-YSZ particles as the anode materials for solid oxide fuel cells, the reduction temperature of the flake-shaped NiO-YSZ particles and catalytic activity on the methane steam/CO2 reforming reactions of the H2-reduced particles as well as the electrochemical impedance spectra of the YSZ supported symmetrical cells with the electrodes made from these particles were examined in comparison with the mixed commercial NiO-YSZ. HRTEM revealed that the nanocrystalline YSZ was dispersed in the NiO matrix and distributed on the surface of the flake-shaped NiO-YSZ particles. The catalytic performance of the flake-shaped NiO-YSZ particles was better than that of the mixed commercial NiO-YSZ in both steam reforming and CO2 reforming of methane. The symmetrical cell made from the flake-shaped NiO-YSZ exhibited a much lower polarization resistance at the operating temperatures below 800 °C than that made from the mixed commercial NiO-YSZ. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867290 Exemplaires
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