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Auteur Yi Zhang |
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Ajouter le résultat dans votre panier Faire une suggestion Affiner la rechercheBlind System Identification of Noncoprime Multichannel Systems and Its Application to Noninvasive Cardiovascular Monitoring / Yi Zhang in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 126 N° 4 (Décembre 2004)
Titre : Blind System Identification of Noncoprime Multichannel Systems and Its Application to Noninvasive Cardiovascular Monitoring Titre original : Identification Sans Visibilité de Système des Systèmes Multicanaux de Noncoprime et de Son Application à la Surveillance Cardiovasculaire Non Envahissante Type de document : texte imprimé Auteurs : Yi Zhang, Auteur ; Harry Asada, H., Auteur Année de publication : 2006 Article en page(s) : 834-847 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Visibilité multicanale de système Système dynamique Méthode MBSI IIID cardiovasculaire Index. décimale : 629.8 Résumé : Multichannel blind system identification (MBSI) is a technique for estimating both an unknown input and unknown channel dynamics from outputs measured at different points of the system. MBSI is a powerful tool particularly for the identification and estimation of dynamical systems in which a sensor, for measuring the input, is difficult to place. MBSI algorithms, however, are not applicable unless the transfer functions of individual channels are coprime, i.e., sharing no common dynamics among the channels. This paper presents a MBSI method, called intermediate input identification (IIID), applicable to multichannel, noncoprime systems containing common dynamics. A variable is introduced to split the original multichannel system into coprime multichannel subsystems and the one consisting of common dynamics. A modified MBSI method is used for identifying the coprime distinct channel dynamics, while the common dynamics is identified based on its unforced response. Identifiability conditions using linear complexity are obtained for both known and unknown model structures. Uniqueness and other properties of the solution are examined. The IIID method is then applied to noninvasive monitoring of the cardiovascular system. The arterial network is modeled as a multichannel system where the blood flow generated by the left ventricle is the input and pressure profiles measured at different branches of the artery, e.g., brachial, carotid, and femoral arteries, are the outputs. While the direct measurement of the input requires a catheter to be inserted into the heart, the IIID method does not need invasive catheterization. It would allow us to estimate both the wave form of the input flow and the arterial channel dynamics from outputs obtained with noninvasive sensors placed at different branches of the arterial network. Numerical examples and simulations verify the major theoretical results and the feasibility of the method.
L'identification sans visibilité multicanale de système (MBSI) est une technique pour estimer une dynamique inconnue de canal d'entrée et d'inconnu des sorties mesurées à différents points du système. MBSI est un outil puissant en particulier pour l'identification et l'évaluation des systèmes dynamiques dans lesquels il est difficile placer une sonde, pour mesurer l'entrée. Les algorithmes de MBSI, cependant, ne sont pas applicables à moins que les fonctions de transfert de différents canaux soient copremières, c.-à-d., ne mettant en commun aucune dynamique commune entre les canaux. Cet article présente une méthode de MBSI, appelée l'identification intermédiaire d'entrée (IIID), applicable à multicanal, systèmes de noncoprime contenant la dynamique commune. Une variable est présentée pour couper le système multicanal original en sous-ensembles multicanaux copremiers et une dynamique commune se composante. Une méthode modifiée de MBSI est employée pour identifier la dynamique distincte copremière de canal, alors que la dynamique commune est identifiée basait sur le son unforced la réponse. Des états d'identifiabilité employant la complexité linéaire sont obtenus pour les structures modèles connues et inconnues. L'unicité et d'autres propriétés de la solution sont examinées. La méthode d'IIID est alors appliquée à la surveillance non envahissante du système cardiovasculaire. Le réseau artériel est modelé comme système multicanal où l'écoulement de sang produit par le ventricule gauche est les profils d'entrée et de pression mesurés à différentes branches de l'artère, par exemple, artères brachiales, carotides, et fémorales, sont les sorties. Tandis que la mesure directe de l'entrée exige d'un cathéter d'être inséré dans le coeur, la méthode d'IIID n'a pas besoin de cathéterisation invahissante. Elle nous permettrait d'estimer tous les deux la forme de vague de l'écoulement d'entrée et la dynamique artérielle de canal des sorties obtenues avec les sondes non envahissantes placées à différentes branches du réseau artériel. Les exemples et les simulations numériques vérifient les résultats théoriques principaux et la praticabilité de la méthode.
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 4 (Décembre 2004) . - 834-847 p.[article] Blind System Identification of Noncoprime Multichannel Systems and Its Application to Noninvasive Cardiovascular Monitoring = Identification Sans Visibilité de Système des Systèmes Multicanaux de Noncoprime et de Son Application à la Surveillance Cardiovasculaire Non Envahissante [texte imprimé] / Yi Zhang, Auteur ; Harry Asada, H., Auteur . - 2006 . - 834-847 p.
Génie Mécanique
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 4 (Décembre 2004) . - 834-847 p.
Mots-clés : Visibilité multicanale de système Système dynamique Méthode MBSI IIID cardiovasculaire Index. décimale : 629.8 Résumé : Multichannel blind system identification (MBSI) is a technique for estimating both an unknown input and unknown channel dynamics from outputs measured at different points of the system. MBSI is a powerful tool particularly for the identification and estimation of dynamical systems in which a sensor, for measuring the input, is difficult to place. MBSI algorithms, however, are not applicable unless the transfer functions of individual channels are coprime, i.e., sharing no common dynamics among the channels. This paper presents a MBSI method, called intermediate input identification (IIID), applicable to multichannel, noncoprime systems containing common dynamics. A variable is introduced to split the original multichannel system into coprime multichannel subsystems and the one consisting of common dynamics. A modified MBSI method is used for identifying the coprime distinct channel dynamics, while the common dynamics is identified based on its unforced response. Identifiability conditions using linear complexity are obtained for both known and unknown model structures. Uniqueness and other properties of the solution are examined. The IIID method is then applied to noninvasive monitoring of the cardiovascular system. The arterial network is modeled as a multichannel system where the blood flow generated by the left ventricle is the input and pressure profiles measured at different branches of the artery, e.g., brachial, carotid, and femoral arteries, are the outputs. While the direct measurement of the input requires a catheter to be inserted into the heart, the IIID method does not need invasive catheterization. It would allow us to estimate both the wave form of the input flow and the arterial channel dynamics from outputs obtained with noninvasive sensors placed at different branches of the arterial network. Numerical examples and simulations verify the major theoretical results and the feasibility of the method.
L'identification sans visibilité multicanale de système (MBSI) est une technique pour estimer une dynamique inconnue de canal d'entrée et d'inconnu des sorties mesurées à différents points du système. MBSI est un outil puissant en particulier pour l'identification et l'évaluation des systèmes dynamiques dans lesquels il est difficile placer une sonde, pour mesurer l'entrée. Les algorithmes de MBSI, cependant, ne sont pas applicables à moins que les fonctions de transfert de différents canaux soient copremières, c.-à-d., ne mettant en commun aucune dynamique commune entre les canaux. Cet article présente une méthode de MBSI, appelée l'identification intermédiaire d'entrée (IIID), applicable à multicanal, systèmes de noncoprime contenant la dynamique commune. Une variable est présentée pour couper le système multicanal original en sous-ensembles multicanaux copremiers et une dynamique commune se composante. Une méthode modifiée de MBSI est employée pour identifier la dynamique distincte copremière de canal, alors que la dynamique commune est identifiée basait sur le son unforced la réponse. Des états d'identifiabilité employant la complexité linéaire sont obtenus pour les structures modèles connues et inconnues. L'unicité et d'autres propriétés de la solution sont examinées. La méthode d'IIID est alors appliquée à la surveillance non envahissante du système cardiovasculaire. Le réseau artériel est modelé comme système multicanal où l'écoulement de sang produit par le ventricule gauche est les profils d'entrée et de pression mesurés à différentes branches de l'artère, par exemple, artères brachiales, carotides, et fémorales, sont les sorties. Tandis que la mesure directe de l'entrée exige d'un cathéter d'être inséré dans le coeur, la méthode d'IIID n'a pas besoin de cathéterisation invahissante. Elle nous permettrait d'estimer tous les deux la forme de vague de l'écoulement d'entrée et la dynamique artérielle de canal des sorties obtenues avec les sondes non envahissantes placées à différentes branches du réseau artériel. Les exemples et les simulations numériques vérifient les résultats théoriques principaux et la praticabilité de la méthode.Exemplaires
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Titre : Control of product distribution of fischer – tropsch synthesis with a novel rotating packed - bed reactor : From diesel to light olefin Type de document : texte imprimé Auteurs : Jian-feng Chen, Auteur ; Yi Liu, Auteur ; Yi Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 8700-8703 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fixed bed reactor Fischer Tropsch synthesis Résumé : A rotating packed-bed (RPB) reactor has been first applied to the Fischer―Tropsch synthesis (FTS) reaction. The main products of the FTS can be selectively formed by choosing the optimum high gravity level of the RPB reactor, which has opened a door to tailor the product distribution of FTS. The high selectivity of light olefins in RPB reactor provides a novel pathway to directly and effectively form light olefins from syngas, syngas to olefin (STO), which would avoid low-efficiency methanol synthesis and methanol-to-olefin (MTO) process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066798
in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8700-8703[article] Control of product distribution of fischer – tropsch synthesis with a novel rotating packed - bed reactor : From diesel to light olefin [texte imprimé] / Jian-feng Chen, Auteur ; Yi Liu, Auteur ; Yi Zhang, Auteur . - 2012 . - pp. 8700-8703.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8700-8703
Mots-clés : Fixed bed reactor Fischer Tropsch synthesis Résumé : A rotating packed-bed (RPB) reactor has been first applied to the Fischer―Tropsch synthesis (FTS) reaction. The main products of the FTS can be selectively formed by choosing the optimum high gravity level of the RPB reactor, which has opened a door to tailor the product distribution of FTS. The high selectivity of light olefins in RPB reactor provides a novel pathway to directly and effectively form light olefins from syngas, syngas to olefin (STO), which would avoid low-efficiency methanol synthesis and methanol-to-olefin (MTO) process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066798 Exemplaires
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Titre : Novel Ethanol Synthesis Method via C1 Chemicals without Any Agriculture Feedstocks Type de document : texte imprimé Auteurs : Yi Zhang, Auteur ; Xiaoguang San, Auteur ; Noritatsu Tsubaki, Auteur Année de publication : 2010 Article en page(s) : pp. 5485–5488 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ethanol Synthesis Résumé : A new method of ethanol synthesis from dimethyl ether (DME) and syngas was developed, which is via combined carbonylation of dimethyl ether and hydrogenation of methyl acetate. The conversion of DME is up to 100% and the selectivity of ethanol is as high as 48.5%. On the other hand, methanol as another main product of this study is formed as 47.6%, which can be recycled as a reactant of DME synthesis (MTD), leading to lower the cost of this new ethanol synthesis method. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901882s
in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5485–5488[article] Novel Ethanol Synthesis Method via C1 Chemicals without Any Agriculture Feedstocks [texte imprimé] / Yi Zhang, Auteur ; Xiaoguang San, Auteur ; Noritatsu Tsubaki, Auteur . - 2010 . - pp. 5485–5488.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5485–5488
Mots-clés : Ethanol Synthesis Résumé : A new method of ethanol synthesis from dimethyl ether (DME) and syngas was developed, which is via combined carbonylation of dimethyl ether and hydrogenation of methyl acetate. The conversion of DME is up to 100% and the selectivity of ethanol is as high as 48.5%. On the other hand, methanol as another main product of this study is formed as 47.6%, which can be recycled as a reactant of DME synthesis (MTD), leading to lower the cost of this new ethanol synthesis method. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901882s Exemplaires
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Titre : Novel inherently flame-retardant poly(trimethylene terephthalate) copolyester with the phosphorus-containing linking pendent group Type de document : texte imprimé Auteurs : Hong-Bing Chen, Auteur ; Yi Zhang, Auteur ; Chen, Li, Auteur Année de publication : 2010 Article en page(s) : pp 7052–7059 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Copolyester Phosphorus. Résumé : A novel phosphorus-containing copolyester, poly(trimethylene terephthalate)-co-poly(trimethylene DDP)s (PTTP), was synthesized through esterification and polycondensation of terephthalic acid (TPA), 1,3-propane diol (PDO), and 9,10-dihydro-10-[2,3-di(hydroxycarbonyl)propyl]-10-phospha-phenanthrene-10-oxide (DDP). The analysis of phosphorus content and the test of intrinsic viscosity indicated that DDP was successfully introduced to the poly(trimethylene terephthalate) (PTT) chain. The chemical structure of the resulting copolyesters was further confirmed by 1H NMR and 31P NMR. The thermal behaviors were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and it was shown that the introduction of DDP lowered the melting temperature and crystallization because of its bulky pendent groups and decreased the initial decomposition temperature in the nitrogen atmosphere due to its weak P−C bond. The flame retardant properties of the resulting copolyesters were characterized by limiting oxygen index (LOI) and cone calorimeter, and it was shown that the copolyesters had good inherent flame retardancy. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1006917
in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 7052–7059[article] Novel inherently flame-retardant poly(trimethylene terephthalate) copolyester with the phosphorus-containing linking pendent group [texte imprimé] / Hong-Bing Chen, Auteur ; Yi Zhang, Auteur ; Chen, Li, Auteur . - 2010 . - pp 7052–7059.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 7052–7059
Mots-clés : Copolyester Phosphorus. Résumé : A novel phosphorus-containing copolyester, poly(trimethylene terephthalate)-co-poly(trimethylene DDP)s (PTTP), was synthesized through esterification and polycondensation of terephthalic acid (TPA), 1,3-propane diol (PDO), and 9,10-dihydro-10-[2,3-di(hydroxycarbonyl)propyl]-10-phospha-phenanthrene-10-oxide (DDP). The analysis of phosphorus content and the test of intrinsic viscosity indicated that DDP was successfully introduced to the poly(trimethylene terephthalate) (PTT) chain. The chemical structure of the resulting copolyesters was further confirmed by 1H NMR and 31P NMR. The thermal behaviors were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and it was shown that the introduction of DDP lowered the melting temperature and crystallization because of its bulky pendent groups and decreased the initial decomposition temperature in the nitrogen atmosphere due to its weak P−C bond. The flame retardant properties of the resulting copolyesters were characterized by limiting oxygen index (LOI) and cone calorimeter, and it was shown that the copolyesters had good inherent flame retardancy. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1006917 Exemplaires
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Titre : Selective leaching of steelmaking slag for indirect CO2 mineral sequestration Type de document : texte imprimé Auteurs : Weijun Bao, Auteur ; Huiquan Li, Auteur ; Yi Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 2055–2063 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : CO2 Steelmaking Lleaching Calcium ions Indirect CO2 mineral Résumé : Indirect CO2 mineral sequestration, which could make CO2 fixate into precipitated calcium carbonate (PCC) of value-added products, is an important technology that is used to reduce greenhouse gas emissions economically. It can be conducted in two steps, one of which has been investigated in the previous paper. In this work, extraction of calcium ions from steelmaking slag using a novel leaching medium, which involves organic solvent tributyl phosphate (TBP), acetic acid, and ultrapure water, was studied. Several operating variables, including stirring speed, phase-volume ratio, organic solvent-to-solid ratio, initial acetic acid concentration, acid-to-slag ratio, reaction temperature, and reaction time were investigated. It was found that the leaching process could be divided into three regions according to the acid-to-slag ratio. The first region below 0.5 g/g was characterized by the acid-to-solid ratio; the second region above 0.5 g/g but below 1.0 g/g was characterized by the acid-to-solid ratio; and the third region above 1.0 g/g was characterized by the acid-to-solid ratio. When the acid-to-solid ratio was below 1.0 g/g, only Ca and Mg could be leached with the maximum leached ratios of 75% and 35%, respectively. Moreover, the leaching behaviors of Ca, Mg, Fe, Al, and Si were greatly affected by reaction temperature and reaction time. Results show that the calcium ions can be effectively and selectively extracted from the steelmaking slag and that the reaction medium can be recovered and recycled with high efficiency. These are the keys to indirect CO2 mineral sequestration. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801850s
in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2055–2063[article] Selective leaching of steelmaking slag for indirect CO2 mineral sequestration [texte imprimé] / Weijun Bao, Auteur ; Huiquan Li, Auteur ; Yi Zhang, Auteur . - 2010 . - pp. 2055–2063.
Industrial Chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2055–2063
Mots-clés : CO2 Steelmaking Lleaching Calcium ions Indirect CO2 mineral Résumé : Indirect CO2 mineral sequestration, which could make CO2 fixate into precipitated calcium carbonate (PCC) of value-added products, is an important technology that is used to reduce greenhouse gas emissions economically. It can be conducted in two steps, one of which has been investigated in the previous paper. In this work, extraction of calcium ions from steelmaking slag using a novel leaching medium, which involves organic solvent tributyl phosphate (TBP), acetic acid, and ultrapure water, was studied. Several operating variables, including stirring speed, phase-volume ratio, organic solvent-to-solid ratio, initial acetic acid concentration, acid-to-slag ratio, reaction temperature, and reaction time were investigated. It was found that the leaching process could be divided into three regions according to the acid-to-slag ratio. The first region below 0.5 g/g was characterized by the acid-to-solid ratio; the second region above 0.5 g/g but below 1.0 g/g was characterized by the acid-to-solid ratio; and the third region above 1.0 g/g was characterized by the acid-to-solid ratio. When the acid-to-solid ratio was below 1.0 g/g, only Ca and Mg could be leached with the maximum leached ratios of 75% and 35%, respectively. Moreover, the leaching behaviors of Ca, Mg, Fe, Al, and Si were greatly affected by reaction temperature and reaction time. Results show that the calcium ions can be effectively and selectively extracted from the steelmaking slag and that the reaction medium can be recovered and recycled with high efficiency. These are the keys to indirect CO2 mineral sequestration. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801850s Exemplaires
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