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Aroma enhancement and characterization of the absolute osmanthus fragrans lour. / Wei-Rong Yao in The journal of essential oil research, Vol. 22 N° 2 (Mars/Avril 2010) 

Public ISBD [article]  in The journal of essential oil research > Vol. 22 N° 2 (Mars/Avril 2010) . - pp. 97-102 Titre : Aroma enhancement and characterization of the absolute osmanthus fragrans lour. Type de document : texte imprimé Auteurs : Wei-Rong Yao, Auteur ; Yin-Zhu Zhang, Auteur ; Yi Chen, Auteur Article en page(s) : pp. 97-102 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Osmanthus  fragrans  Oleaceae  Absolute  composition  Glycosidically  bound  volatiles  Megastigma-4,6(E)  8(E)-triene  Dihydro-β-ionol  (E)-β-ionone Index. décimale : 646 Résumé : In this paper, β-glucosidase hydrolysis approach was applied on Osmanthus fragrans Lour. flowers for the aroma enhancement of the extract. The hydrolysis and extraction conditions, including enzyme amount, temperature, time, rate of agitation, buffer pH, buffer volume, extraction time, extraction temperature and petroleum ether volume, were optimized. The crude extract (concrete) and refined extract (absolute) under optimum conditions had increased yields of 0.42% and 0.25%, which were 147.1% and 177.8%, respectively, as compared with the procedure without the β-glucosidase hydrolysis. Analyses showed no obvious qualitative differences in the volatiles produced with and without enzymatic hydrolysis. However, the amount of typical aroma components significantly increased in the hydrolysis sample. As compared with the no-hydrolysis control, the first four aroma components with the most increase were 6,10,14-trimethyl-2-pentadecan-2-one, nonanal, dihydro-β-ionol and (E)-β-ionone in the hydrolysis sample. Megastigma-4,6(E),8(E)-triene was only found in the hydrolysis sample, but the amount of trans-linalool oxide, cis-linalool oxide and dihydro-3-oxo-ionol decreased. Organoleptic assessment supported that the hydrolysis sample produced a stronger fragrance. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/50 [article] Aroma enhancement and characterization of the absolute osmanthus fragrans lour. [texte imprimé] / Wei-Rong Yao, Auteur ; Yin-Zhu Zhang, Auteur ; Yi Chen, Auteur . - pp. 97-102. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 22 N° 2 (Mars/Avril 2010) . - pp. 97-102 Mots-clés : Osmanthus  fragrans  Oleaceae  Absolute  composition  Glycosidically  bound  volatiles  Megastigma-4,6(E)  8(E)-triene  Dihydro-β-ionol  (E)-β-ionone Index. décimale : 646 Résumé : In this paper, β-glucosidase hydrolysis approach was applied on Osmanthus fragrans Lour. flowers for the aroma enhancement of the extract. The hydrolysis and extraction conditions, including enzyme amount, temperature, time, rate of agitation, buffer pH, buffer volume, extraction time, extraction temperature and petroleum ether volume, were optimized. The crude extract (concrete) and refined extract (absolute) under optimum conditions had increased yields of 0.42% and 0.25%, which were 147.1% and 177.8%, respectively, as compared with the procedure without the β-glucosidase hydrolysis. Analyses showed no obvious qualitative differences in the volatiles produced with and without enzymatic hydrolysis. However, the amount of typical aroma components significantly increased in the hydrolysis sample. As compared with the no-hydrolysis control, the first four aroma components with the most increase were 6,10,14-trimethyl-2-pentadecan-2-one, nonanal, dihydro-β-ionol and (E)-β-ionone in the hydrolysis sample. Megastigma-4,6(E),8(E)-triene was only found in the hydrolysis sample, but the amount of trans-linalool oxide, cis-linalool oxide and dihydro-3-oxo-ionol decreased. Organoleptic assessment supported that the hydrolysis sample produced a stronger fragrance. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/50

Hybrid fuzzy skyhook surface control using multi-objective microgenetic algorithm for semi-active vehicle suspension system ride comfort stability analysis / Yi Chen in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 4 (Juillet 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 4 (Juillet 2012) . - 14 p. Titre : Hybrid fuzzy skyhook surface control using multi-objective microgenetic algorithm for semi-active vehicle suspension system ride comfort stability analysis Type de document : texte imprimé Auteurs : Yi Chen, Auteur ; Zhong-Lai Wang, Auteur ; Jing Qiu, Auteur Année de publication : 2012 Article en page(s) : 14 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Fuzzy  sliding  mode  control  Skyhook  surface  method  Multi-objective  microgenetic  algorithm  (MOµGA)  Vehicle  semi-active  suspension Index. décimale : 629.8 Résumé : A polynomial function supervising fuzzy sliding mode control (PSFalphaSMC), which embedded with skyhook surface method, is proposed for the ride comfort of a vehicle semi-active suspension. The multi-objective microgenetic algorithm (MOµGA) has been utilized to determine the PSFalphaSMC controller's parameter alignment in a training process with three ride comfort objectives for the vehicle semi-active suspension, which is called the “offline” step. Then, the optimized parameters are applied to the real-time control process by the polynomial function supervising controller, which is named “online” step. A two-degree-of-freedom dynamic model of the vehicle semi-active suspension systems with the stability analysis is given for passenger's ride comfort enhancement studies, and a simulation with the given initial conditions has been devised in MATLAB. The numerical results have shown that this hybrid control method is able to provide real-time enhanced level of reliable ride comfort performance for the semi-active suspension system. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000004 [...] [article] Hybrid fuzzy skyhook surface control using multi-objective microgenetic algorithm for semi-active vehicle suspension system ride comfort stability analysis [texte imprimé] / Yi Chen, Auteur ; Zhong-Lai Wang, Auteur ; Jing Qiu, Auteur . - 2012 . - 14 p. Dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 4 (Juillet 2012) . - 14 p. Mots-clés : Fuzzy  sliding  mode  control  Skyhook  surface  method  Multi-objective  microgenetic  algorithm  (MOµGA)  Vehicle  semi-active  suspension Index. décimale : 629.8 Résumé : A polynomial function supervising fuzzy sliding mode control (PSFalphaSMC), which embedded with skyhook surface method, is proposed for the ride comfort of a vehicle semi-active suspension. The multi-objective microgenetic algorithm (MOµGA) has been utilized to determine the PSFalphaSMC controller's parameter alignment in a training process with three ride comfort objectives for the vehicle semi-active suspension, which is called the “offline” step. Then, the optimized parameters are applied to the real-time control process by the polynomial function supervising controller, which is named “online” step. A two-degree-of-freedom dynamic model of the vehicle semi-active suspension systems with the stability analysis is given for passenger's ride comfort enhancement studies, and a simulation with the given initial conditions has been devised in MATLAB. The numerical results have shown that this hybrid control method is able to provide real-time enhanced level of reliable ride comfort performance for the semi-active suspension system. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000004 [...]