Documents disponibles écrits par cet auteur

Combinatorial assessment of the activity-composition correlation for several alloy nanoparticle catalysts / Xiajing Shi in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4675–4682 Titre : Combinatorial assessment of the activity-composition correlation for several alloy nanoparticle catalysts Type de document : texte imprimé Auteurs : Xiajing Shi, Auteur ; Jin Luo, Auteur ; Peter N. Njoki, Auteur ; Yan Lin, Auteur Année de publication : 2008 Article en page(s) : p. 4675–4682 Note générale : Bibliogr. p. 4682 Langues : Anglais (eng) Mots-clés : Nanoparticle  catalysts;  Electrocatalytic  parameters;  Response  surface  approach Résumé : The screening of catalysts with desired catalytic activity and selectivity for electrocatalytic fuel cell reactions is a time-consuming process. One approach to address this problem is to apply combinatorial analysis techniques. In this paper, we present the results of an investigation of the application of systematic statistical analysis techniques such as analysis of variance (ANOVA) analysis and regression modeling for the development of effective screening methods of bimetallic and trimetallic nanoparticle catalysts. Based on several sets of experimental data from the chosen catalysts, empirical models derived from statistical analysis techniques were first built to fit the experiment results for each of the electrocatalytic parameters such as catalytic peak current, peak potential, Tafel slope and mass activities. These parameters were expressed as a function of catalyst component proportion variables and process variables. The adequacy of the chosen models is verified with residual analysis. The catalyst properties were also analyzed using a response surface approach. The statistical analysis results from the available experiment data provided useful information to aid the understanding of the relationship between the catalyst activities and compositions, which may provide guidance for experimental design toward discovery of catalysts with desired activity and selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800308h [article] Combinatorial assessment of the activity-composition correlation for several alloy nanoparticle catalysts [texte imprimé] / Xiajing Shi, Auteur ; Jin Luo, Auteur ; Peter N. Njoki, Auteur ; Yan Lin, Auteur . - 2008 . - p. 4675–4682. Bibliogr. p. 4682 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4675–4682 Mots-clés : Nanoparticle  catalysts;  Electrocatalytic  parameters;  Response  surface  approach Résumé : The screening of catalysts with desired catalytic activity and selectivity for electrocatalytic fuel cell reactions is a time-consuming process. One approach to address this problem is to apply combinatorial analysis techniques. In this paper, we present the results of an investigation of the application of systematic statistical analysis techniques such as analysis of variance (ANOVA) analysis and regression modeling for the development of effective screening methods of bimetallic and trimetallic nanoparticle catalysts. Based on several sets of experimental data from the chosen catalysts, empirical models derived from statistical analysis techniques were first built to fit the experiment results for each of the electrocatalytic parameters such as catalytic peak current, peak potential, Tafel slope and mass activities. These parameters were expressed as a function of catalyst component proportion variables and process variables. The adequacy of the chosen models is verified with residual analysis. The catalyst properties were also analyzed using a response surface approach. The statistical analysis results from the available experiment data provided useful information to aid the understanding of the relationship between the catalyst activities and compositions, which may provide guidance for experimental design toward discovery of catalysts with desired activity and selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800308h

Mode-independent stabilization of Markovian jump systems with time-varying delays / Ran Huang in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 5 (Septembre 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 5 (Septembre 2012) . - 10 p. Titre : Mode-independent stabilization of Markovian jump systems with time-varying delays : a sliding mode approach Type de document : texte imprimé Auteurs : Ran Huang, Auteur ; Yan Lin, Auteur ; Zhongwei Lin, Auteur Année de publication : 2012 Article en page(s) : 10 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Markovian  jump  systems  Time-delay  Sliding  mode  control  Jumping  effect Résumé : This paper investigates mode-independent stabilization of Markovian jump systems with time-varying delays via a sliding mode approach. A sufficient condition is proposed to guarantee the existence of a mode-independent sliding surface. Because the real plant regime mode is not directly accessible and instantly available, a controller is reconfigured online by calculating a detection function such that the closed-loop system converges to the sliding surface in finite time. A comparison example is presented to illustrate merits of the developed theory. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000005 [...] [article] Mode-independent stabilization of Markovian jump systems with time-varying delays : a sliding mode approach [texte imprimé] / Ran Huang, Auteur ; Yan Lin, Auteur ; Zhongwei Lin, Auteur . - 2012 . - 10 p. Dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 5 (Septembre 2012) . - 10 p. Mots-clés : Markovian  jump  systems  Time-delay  Sliding  mode  control  Jumping  effect Résumé : This paper investigates mode-independent stabilization of Markovian jump systems with time-varying delays via a sliding mode approach. A sufficient condition is proposed to guarantee the existence of a mode-independent sliding surface. Because the real plant regime mode is not directly accessible and instantly available, a controller is reconfigured online by calculating a detection function such that the closed-loop system converges to the sliding surface in finite time. A comparison example is presented to illustrate merits of the developed theory. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000005 [...]

Performance and application of equivalent force control method for real-time substructure testing / Bin Wu in Journal of engineering mechanics, Vol. 138 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 11 (Novembre 2012) . - pp.1303–1316. Titre : Performance and application of equivalent force control method for real-time substructure testing Type de document : texte imprimé Auteurs : Bin Wu, Auteur ; Guoshan Xu, Auteur ; Yan Lin, Auteur Année de publication : 2013 Article en page(s) : pp.1303–1316. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Real-time  substructure  test  Hybrid  simulation  Equivalent  force  control  Implicit  integration  Pseudodynamic  test Résumé : The equivalent force control (EFC) method has been developed for real-time substructure testing with implicit integration to replace the numerical iterative process with feedback control. This paper addresses two issues concerning the performance of this method. One is the determination of the force-displacement conversion factor (a key component of EFC) for nonlinear specimens. The analysis conducted here shows that the force-displacement conversion factor is largely governed by the properties of the numerical substructure and the numerical scheme when a small integration time interval is used. Otherwise, the factor has to be determined with the secant stiffness of the specimen and of the numerical substructure if a proportional-derivative controller is used for EFC. The other issue is the overshooting problem, which may arise for multidegree-of-freedom structures because of the relatively quick response feedback from the numerical substructure in the closed-loop EFC. This problem can be resolved by reducing either the EFC gains or the increment size of the equivalent force command. The analytical studies on these two issues are verified by numerical simulations and for real-time substructure tests conducted on structural models with buckling restrained braces. Furthermore, a real-time substructure test was conducted on an offshore platform with magnetorheological dampers in order to serve as an example of a practical application of the method ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000445?journalCod [...] [article] Performance and application of equivalent force control method for real-time substructure testing [texte imprimé] / Bin Wu, Auteur ; Guoshan Xu, Auteur ; Yan Lin, Auteur . - 2013 . - pp.1303–1316. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 11 (Novembre 2012) . - pp.1303–1316. Mots-clés : Real-time  substructure  test  Hybrid  simulation  Equivalent  force  control  Implicit  integration  Pseudodynamic  test Résumé : The equivalent force control (EFC) method has been developed for real-time substructure testing with implicit integration to replace the numerical iterative process with feedback control. This paper addresses two issues concerning the performance of this method. One is the determination of the force-displacement conversion factor (a key component of EFC) for nonlinear specimens. The analysis conducted here shows that the force-displacement conversion factor is largely governed by the properties of the numerical substructure and the numerical scheme when a small integration time interval is used. Otherwise, the factor has to be determined with the secant stiffness of the specimen and of the numerical substructure if a proportional-derivative controller is used for EFC. The other issue is the overshooting problem, which may arise for multidegree-of-freedom structures because of the relatively quick response feedback from the numerical substructure in the closed-loop EFC. This problem can be resolved by reducing either the EFC gains or the increment size of the equivalent force command. The analytical studies on these two issues are verified by numerical simulations and for real-time substructure tests conducted on structural models with buckling restrained braces. Furthermore, a real-time substructure test was conducted on an offshore platform with magnetorheological dampers in order to serve as an example of a practical application of the method ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000445?journalCod [...]

Robust fuzzy tracking control design for a class of nonlinear stochastic markovian jump systems / Ran Huang in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 132 N° 5 (Septembre 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 5 (Septembre 2010) . - 09 p. Titre : Robust fuzzy tracking control design for a class of nonlinear stochastic markovian jump systems Type de document : texte imprimé Auteurs : Ran Huang, Auteur ; Yan Lin, Auteur ; Zhongwei Lin, Auteur Année de publication : 2010 Article en page(s) : 09 p. Note générale : Systèmes dynamiques Langues : Anglais (eng) Mots-clés : Robust  tracking  control  Fuzzy  approximation  Nonlinear  stochastic  systems  Markovian  jumps Index. décimale : 629.8 Résumé : This paper deals with the problem of robust fuzzy tracking control design for a class of nonlinear stochastic Itô-type systems with Markovian jumps. Considering the fuzzy approximation errors as norm-bounded uncertainties, we derive two sufficient conditions for the nonlinear stochastic robust fuzzy tracking control in terms of coupled matrix inequalities, which ensure the globally asymptotical stability in probability and [script L]2 property for the augmented system, respectively. Then, a systematic algorithm is developed to construct the robust fuzzy tracking controller by reformulating the coupled matrix inequalities into two intertwined linear matrix inequalities (LMIs). Finally, a simulation example is presented to illustrate the design procedure. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013200 [...] [article] Robust fuzzy tracking control design for a class of nonlinear stochastic markovian jump systems [texte imprimé] / Ran Huang, Auteur ; Yan Lin, Auteur ; Zhongwei Lin, Auteur . - 2010 . - 09 p. Systèmes dynamiques Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 5 (Septembre 2010) . - 09 p. Mots-clés : Robust  tracking  control  Fuzzy  approximation  Nonlinear  stochastic  systems  Markovian  jumps Index. décimale : 629.8 Résumé : This paper deals with the problem of robust fuzzy tracking control design for a class of nonlinear stochastic Itô-type systems with Markovian jumps. Considering the fuzzy approximation errors as norm-bounded uncertainties, we derive two sufficient conditions for the nonlinear stochastic robust fuzzy tracking control in terms of coupled matrix inequalities, which ensure the globally asymptotical stability in probability and [script L]2 property for the augmented system, respectively. Then, a systematic algorithm is developed to construct the robust fuzzy tracking controller by reformulating the coupled matrix inequalities into two intertwined linear matrix inequalities (LMIs). Finally, a simulation example is presented to illustrate the design procedure. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013200 [...]