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Extraction of germanium by the AOT microemulsion with N235 system / Fei Liu in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10005–10008 Titre : Extraction of germanium by the AOT microemulsion with N235 system Type de document : texte imprimé Auteurs : Fei Liu, Auteur ; Yanzhao Yang, Auteur ; Yanmin Lu, Auteur Année de publication : 2011 Article en page(s) : pp. 10005–10008 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microemulsion Résumé : The extraction of germanium to a W/O microemulsion by the combination with an anionic surfactant and an amine extractant was studied. In the AOT/n-butanol/n-heptane/Na2SO4/N235 system, AOT was used as an anionic surfactant to form a microemulsion in n-heptane, n-butanol was injected in the microemulsion as a cosurfactant to enhance the stability, and N235 was a typical extractant in the system. The microemulsion system without N235 showed poor extractability and stability. However, by adding N235, the extraction efficiency (E%) can be more than 99%, and the stability of the microemulsion extremely enhanced. The influences of the concentration of cosurfactant, temperature, pH of the feed solution, and composition of the feed solution on the extraction efficiency (E%) were verified. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100963t [article] Extraction of germanium by the AOT microemulsion with N235 system [texte imprimé] / Fei Liu, Auteur ; Yanzhao Yang, Auteur ; Yanmin Lu, Auteur . - 2011 . - pp. 10005–10008. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10005–10008 Mots-clés : Microemulsion Résumé : The extraction of germanium to a W/O microemulsion by the combination with an anionic surfactant and an amine extractant was studied. In the AOT/n-butanol/n-heptane/Na2SO4/N235 system, AOT was used as an anionic surfactant to form a microemulsion in n-heptane, n-butanol was injected in the microemulsion as a cosurfactant to enhance the stability, and N235 was a typical extractant in the system. The microemulsion system without N235 showed poor extractability and stability. However, by adding N235, the extraction efficiency (E%) can be more than 99%, and the stability of the microemulsion extremely enhanced. The influences of the concentration of cosurfactant, temperature, pH of the feed solution, and composition of the feed solution on the extraction efficiency (E%) were verified. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100963t

Feasibility of the use of visible and near infrared spectroscopy to assess soluble solids content and pH of rice wines / Fei Liu in Journal of food engineering, Vol. 83 N°3 (Decembre 2007) 

Public ISBD [article]  in Journal of food engineering > Vol. 83 N°3 (Decembre 2007) . - 430-435 p. Titre : Feasibility of the use of visible and near infrared spectroscopy to assess soluble solids content and pH of rice wines Type de document : texte imprimé Auteurs : Fei Liu, Auteur ; He, Yong, Auteur ; Wang, Li, Auteur Article en page(s) : 430-435 p. Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Vis/NIR  spectroscopy  Rice  wine  Soluble  solids  content  (SSC)  pH  Partial  least  squares  (PLS)Vis  /  NIR  spectroscopie  Vin  de  riz  Solides  solubles  (SSC)  Le  pH  Moindres  carrés  partiels  (PLS) Index. décimale : 664 Résumé : Visible and near infrared (Vis/NIR) transmission spectroscopy and a hybrid chemometric method were applied to determine the soluble solids content (SSC) and pH of rice wines. Rice wine samples were scanned by a spectroradiometer within a wavelength region of 325–1075 nm. The calibration set was composed of 240 samples and 60 samples were used as the validation set. Two pre-processing methods were applied on the spectra prior to build PLS regression models. The correlation coefficient (r), standard error of prediction (SEP) and root mean square error of prediction (RMSEP) were 0.95, 0.16 and 0.17 for SSC, while 0.94, 0.02 and 0.02 for pH, respectively. Adequate wavelengths for the SSC and pH prediction were proposed according to the x-loading weights and regression coefficients. The results indicated that Vis/NIR spectroscopy is a promising approach for predicting the SSC and pH of the rice wine. Visible et le proche infrarouge (Vis / NIR) et la spectroscopie de transmission hybride chemometric méthode a été appliquée pour déterminer les éléments solides solubles (SSC) et le pH des vins de riz. Vin de riz échantillons ont été scannés par un spectroradiomètre sein d'une longueur d'onde de 325-1075 mn. L'étalonnage de la série était composée de 240 échantillons et 60 échantillons ont été utilisés comme l'ensemble de validation. Deux méthodes de traitement préalable ont été appliquées sur les spectres avant de construire les modèles de régression PLS. Le coefficient de corrélation (r) erreur standard de prédiction (SEP) et la racine erreur quadratique moyenne de prédiction (RMSEP) étaient 0,95, 0,16 et 0,17 pour la coopération Sud-Sud, tandis que 0,94, 0,02 et 0. 02 pour le pH, respectivement. Les longueurs d'ondes adéquates pour la coopération Sud-Sud et le pH de prédiction ont été proposés en fonction de la charge x poids et coefficients de régression. Les résultats ont indiqué que Vis / NIR spectroscopie est une approche prometteuse pour prédire le pH de la coopération Sud-Sud et le vin de riz. DEWEY : 664 ISSN : 0260-8774 RAMEAU : Alcool de riz En ligne : http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleLis [...] [article] Feasibility of the use of visible and near infrared spectroscopy to assess soluble solids content and pH of rice wines [texte imprimé] / Fei Liu, Auteur ; He, Yong, Auteur ; Wang, Li, Auteur . - 430-435 p. Génie Chimique Langues : Anglais (eng) in Journal of food engineering > Vol. 83 N°3 (Decembre 2007) . - 430-435 p. Mots-clés : Vis/NIR  spectroscopy  Rice  wine  Soluble  solids  content  (SSC)  pH  Partial  least  squares  (PLS)Vis  /  NIR  spectroscopie  Vin  de  riz  Solides  solubles  (SSC)  Le  pH  Moindres  carrés  partiels  (PLS) Index. décimale : 664 Résumé : Visible and near infrared (Vis/NIR) transmission spectroscopy and a hybrid chemometric method were applied to determine the soluble solids content (SSC) and pH of rice wines. Rice wine samples were scanned by a spectroradiometer within a wavelength region of 325–1075 nm. The calibration set was composed of 240 samples and 60 samples were used as the validation set. Two pre-processing methods were applied on the spectra prior to build PLS regression models. The correlation coefficient (r), standard error of prediction (SEP) and root mean square error of prediction (RMSEP) were 0.95, 0.16 and 0.17 for SSC, while 0.94, 0.02 and 0.02 for pH, respectively. Adequate wavelengths for the SSC and pH prediction were proposed according to the x-loading weights and regression coefficients. The results indicated that Vis/NIR spectroscopy is a promising approach for predicting the SSC and pH of the rice wine. Visible et le proche infrarouge (Vis / NIR) et la spectroscopie de transmission hybride chemometric méthode a été appliquée pour déterminer les éléments solides solubles (SSC) et le pH des vins de riz. Vin de riz échantillons ont été scannés par un spectroradiomètre sein d'une longueur d'onde de 325-1075 mn. L'étalonnage de la série était composée de 240 échantillons et 60 échantillons ont été utilisés comme l'ensemble de validation. Deux méthodes de traitement préalable ont été appliquées sur les spectres avant de construire les modèles de régression PLS. Le coefficient de corrélation (r) erreur standard de prédiction (SEP) et la racine erreur quadratique moyenne de prédiction (RMSEP) étaient 0,95, 0,16 et 0,17 pour la coopération Sud-Sud, tandis que 0,94, 0,02 et 0. 02 pour le pH, respectivement. Les longueurs d'ondes adéquates pour la coopération Sud-Sud et le pH de prédiction ont été proposés en fonction de la charge x poids et coefficients de régression. Les résultats ont indiqué que Vis / NIR spectroscopie est une approche prometteuse pour prédire le pH de la coopération Sud-Sud et le vin de riz. DEWEY : 664 ISSN : 0260-8774 RAMEAU : Alcool de riz En ligne : http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleLis [...]

Integrated membrane process for the treatment of desulfurization wastewate / Na Yin in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3337–3341 Titre : Integrated membrane process for the treatment of desulfurization wastewate Type de document : texte imprimé Auteurs : Na Yin, Auteur ; Fei Liu, Auteur ; Zhaoxiang Zhong, Auteur Année de publication : 2010 Article en page(s) : pp. 3337–3341 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Integrated  Membrane  Desulfurization  Wastewate Résumé : In the desulfurization process for purification of coking gas, a huge amount of wastewater is generated. In order to recover the usable substances such as suspended sulfur (SS) and ammonium salts, e.g., (NH4)2S2O3 and NH4SCN, in the wastewater and also to avoid severe environmental problems in the case of improper disposal, an integrated membrane process mainly consisting of ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) was proposed to treat the wastewater. In the UF process, a ceramic membrane was employed to remove SS and an efficiency of 99.9% and a steady flux of about 500 L·m−2·h−1 were achieved. In the NF step, (NH4)2S2O3 was separated from NH4SCN with a retention ratio of 95.0%, and finally 83.0% of (NH4)2S2O3 was recovered in the retentate, whereas 99.2% of NH4SCN was recovered in the permeate via dialysis with deionized water. In the RO process, NH4SCN can be recovered with an efficiency of 99.0% through a four-pass filtration process. Meanwhile, the RO permeate can be reused in the salt diafiltration process. The results show that the proposed integrated membrane process is technically feasible and economically efficient for the treatment of desulfurization wastewater generated in the coking industry. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901267q [article] Integrated membrane process for the treatment of desulfurization wastewate [texte imprimé] / Na Yin, Auteur ; Fei Liu, Auteur ; Zhaoxiang Zhong, Auteur . - 2010 . - pp. 3337–3341. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3337–3341 Mots-clés : Integrated  Membrane  Desulfurization  Wastewate Résumé : In the desulfurization process for purification of coking gas, a huge amount of wastewater is generated. In order to recover the usable substances such as suspended sulfur (SS) and ammonium salts, e.g., (NH4)2S2O3 and NH4SCN, in the wastewater and also to avoid severe environmental problems in the case of improper disposal, an integrated membrane process mainly consisting of ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) was proposed to treat the wastewater. In the UF process, a ceramic membrane was employed to remove SS and an efficiency of 99.9% and a steady flux of about 500 L·m−2·h−1 were achieved. In the NF step, (NH4)2S2O3 was separated from NH4SCN with a retention ratio of 95.0%, and finally 83.0% of (NH4)2S2O3 was recovered in the retentate, whereas 99.2% of NH4SCN was recovered in the permeate via dialysis with deionized water. In the RO process, NH4SCN can be recovered with an efficiency of 99.0% through a four-pass filtration process. Meanwhile, the RO permeate can be reused in the salt diafiltration process. The results show that the proposed integrated membrane process is technically feasible and economically efficient for the treatment of desulfurization wastewater generated in the coking industry. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901267q

Parameter design of a two-current-loop controller used in a grid-connected inverter system with LCL filter / Fei Liu in IEEE transactions on industrial electronics, Vol. 56 N° 11 (Novembre 2009) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 56 N° 11 (Novembre 2009) . - pp. 4483 - 4491 Titre : Parameter design of a two-current-loop controller used in a grid-connected inverter system with LCL filter Type de document : texte imprimé Auteurs : Fei Liu, Auteur ; Zhou, Yan, Auteur ; Duan, Shanxu, Auteur Article en page(s) : pp. 4483 - 4491 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Grid  connected  LCL  filter  Renewable  energy  generation  Two-current-loop  controller Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : LCL filters offer a better choice of attenuating switching frequency harmonics. However, in a grid-connected system, an LCL filter may cause resonance which is a disaster for the system's stability. In order to solve the problem, a two-current-loop control strategy, which includes grid-current outer loop and filter-capacitor-current inner loop, is adopted here. The implementation of this strategy is easy, but the tuning procedure is complex since the outer and inner controllers cannot cooperate well if the parameters of the controllers are not suitable. There is no literature which mentions a method to help give out accurate parameters of the controller. The difficulty of designing the controller is that only two feedbacks cannot provide complete information of a three-order LCL filter. A specific method is proposed in this paper to design the controller. The advantage of this method is to provide a way to maximize the utilization of the two feedbacks to get good system performance through parameter determination. The practicability of the method is tested by using bode diagram, and the antidistortion ability of the system is analyzed. Finally, experimental results verify the availability and correctness of the proposed method. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4909027 [article] Parameter design of a two-current-loop controller used in a grid-connected inverter system with LCL filter [texte imprimé] / Fei Liu, Auteur ; Zhou, Yan, Auteur ; Duan, Shanxu, Auteur . - pp. 4483 - 4491. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 56 N° 11 (Novembre 2009) . - pp. 4483 - 4491 Mots-clés : Grid  connected  LCL  filter  Renewable  energy  generation  Two-current-loop  controller Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : LCL filters offer a better choice of attenuating switching frequency harmonics. However, in a grid-connected system, an LCL filter may cause resonance which is a disaster for the system's stability. In order to solve the problem, a two-current-loop control strategy, which includes grid-current outer loop and filter-capacitor-current inner loop, is adopted here. The implementation of this strategy is easy, but the tuning procedure is complex since the outer and inner controllers cannot cooperate well if the parameters of the controllers are not suitable. There is no literature which mentions a method to help give out accurate parameters of the controller. The difficulty of designing the controller is that only two feedbacks cannot provide complete information of a three-order LCL filter. A specific method is proposed in this paper to design the controller. The advantage of this method is to provide a way to maximize the utilization of the two feedbacks to get good system performance through parameter determination. The practicability of the method is tested by using bode diagram, and the antidistortion ability of the system is analyzed. Finally, experimental results verify the availability and correctness of the proposed method. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4909027

Stochastic finite-time stabilization for uncertain jump systems via state feedback / Shuping He in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 132 N° 3 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 3 (Mai 2010) . - 04 p. Titre : Stochastic finite-time stabilization for uncertain jump systems via state feedback Type de document : texte imprimé Auteurs : Shuping He, Auteur ; Fei Liu, Auteur Année de publication : 2010 Article en page(s) : 04 p. Note générale : Systèmes dynamiques Langues : Anglais (eng) Mots-clés : Linear  matrix  inequalities  Lyapunov  methods  Markov  processes  Robust  control  State  feedback Index. décimale : 629.8 Résumé : The stochastic finite-time stabilization problem is considered for a class of linear uncertain Markov jump systems that possess randomly jumping parameters. The transition of the jumping parameters is governed by a finite-state Markov process. By using the appropriate stochastic Lyapunov–Krasovskii functional approach, sufficient conditions are proposed for the design of stochastic finite-time stabilization controller. The stabilization criteria are formulated in the form of linear matrix inequalities and the designed finite-time stabilization controller is described as an optimization one. The designed finite-time stabilized controller makes the stochastic MJSs stochastic finite-time bounded and stochastic finite-time stabilizable for all admissible unknown external disturbances and uncertain parameters. Simulation results illustrate the effectiveness of the developed approaches. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013200 [...] [article] Stochastic finite-time stabilization for uncertain jump systems via state feedback [texte imprimé] / Shuping He, Auteur ; Fei Liu, Auteur . - 2010 . - 04 p. Systèmes dynamiques Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 3 (Mai 2010) . - 04 p. Mots-clés : Linear  matrix  inequalities  Lyapunov  methods  Markov  processes  Robust  control  State  feedback Index. décimale : 629.8 Résumé : The stochastic finite-time stabilization problem is considered for a class of linear uncertain Markov jump systems that possess randomly jumping parameters. The transition of the jumping parameters is governed by a finite-state Markov process. By using the appropriate stochastic Lyapunov–Krasovskii functional approach, sufficient conditions are proposed for the design of stochastic finite-time stabilization controller. The stabilization criteria are formulated in the form of linear matrix inequalities and the designed finite-time stabilization controller is described as an optimization one. The designed finite-time stabilized controller makes the stochastic MJSs stochastic finite-time bounded and stochastic finite-time stabilizable for all admissible unknown external disturbances and uncertain parameters. Simulation results illustrate the effectiveness of the developed approaches. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013200 [...]

Study on the FCC process of a novel riser−downer coupling reactor (III) / Fei Liu ; Wei Fei ; Guoliang Li in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

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