Documents disponibles écrits par cet auteur

H2SO4 - catalyzed hydrothermal pretreatment of triploid poplar to enhance enzymatic hydrolysis / Haiyan Yang in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11598-11604 Titre : H2SO4 - catalyzed hydrothermal pretreatment of triploid poplar to enhance enzymatic hydrolysis Type de document : texte imprimé Auteurs : Haiyan Yang, Auteur ; Kun Wang, Auteur ; Feng Xu, Auteur Année de publication : 2012 Article en page(s) : pp. 11598-11604 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrolysis  Pretreatment  Catalytic  reaction Résumé : Sealed structure of plant biomass resists assault on cellulose from enzymatic deconstruction. In this study, pretreatments of triploid poplar were conducted with 0.5 wt % H2SO4 at various temperatures (100―200 °C) to loosen the intricate structure. The effect of temperature on cellulose structure and enzymatic digestibility was evaluated. The results indicated that the effective removal of hemicelluloses and amorphous cellulose incurred the increment of crystalline indices of residues. Companied with the degradation of carbohydrates, inhibitory compounds were accumulated with the increasing severity. On the whole, 120 °C was considered as the optimum temperature by taking the balance between substrate digestibility and recovery into account. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350324 [article] H2SO4 - catalyzed hydrothermal pretreatment of triploid poplar to enhance enzymatic hydrolysis [texte imprimé] / Haiyan Yang, Auteur ; Kun Wang, Auteur ; Feng Xu, Auteur . - 2012 . - pp. 11598-11604. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11598-11604 Mots-clés : Hydrolysis  Pretreatment  Catalytic  reaction Résumé : Sealed structure of plant biomass resists assault on cellulose from enzymatic deconstruction. In this study, pretreatments of triploid poplar were conducted with 0.5 wt % H2SO4 at various temperatures (100―200 °C) to loosen the intricate structure. The effect of temperature on cellulose structure and enzymatic digestibility was evaluated. The results indicated that the effective removal of hemicelluloses and amorphous cellulose incurred the increment of crystalline indices of residues. Companied with the degradation of carbohydrates, inhibitory compounds were accumulated with the increasing severity. On the whole, 120 °C was considered as the optimum temperature by taking the balance between substrate digestibility and recovery into account. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350324

Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks / Kun Wang in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8797–8804 Titre : Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks Type de document : texte imprimé Auteurs : Kun Wang, Auteur ; Feng Xu, Auteur ; Run-Cang Sun, Auteur Année de publication : 2010 Article en page(s) : pp. 8797–8804 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Physicochemical  properties Résumé : Hemicellulosic polysaccharides were isolated from the raw and steam-exploded Lespedeza crytobytrya stalks by sequential 1 M NaOH extraction and fractionated into Hemi-a and Hemi-b fractions by acidification and ethanol precipitation, respectively. The Hemi-a fractions had relatively lower molecular weights and took up 84.6−95.5% of the total released hemicelluloses. After steam explosion, both hemicellulosic fractions were obviously degraded, and a certain amount of glucose or oligosaccharides derived from the amorphous cellulose was coisolated. The influence of increasing incubation time from 2 to 10 min is further discussed, based on the physicochemical properties of the obtained hemicelluloses characterized in terms of sugar component, gel permeation chromatography (GPC), thermal stability, and 13C NMR spectroscopy analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101180p [article] Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks [texte imprimé] / Kun Wang, Auteur ; Feng Xu, Auteur ; Run-Cang Sun, Auteur . - 2010 . - pp. 8797–8804. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8797–8804 Mots-clés : Physicochemical  properties Résumé : Hemicellulosic polysaccharides were isolated from the raw and steam-exploded Lespedeza crytobytrya stalks by sequential 1 M NaOH extraction and fractionated into Hemi-a and Hemi-b fractions by acidification and ethanol precipitation, respectively. The Hemi-a fractions had relatively lower molecular weights and took up 84.6−95.5% of the total released hemicelluloses. After steam explosion, both hemicellulosic fractions were obviously degraded, and a certain amount of glucose or oligosaccharides derived from the amorphous cellulose was coisolated. The influence of increasing incubation time from 2 to 10 min is further discussed, based on the physicochemical properties of the obtained hemicelluloses characterized in terms of sugar component, gel permeation chromatography (GPC), thermal stability, and 13C NMR spectroscopy analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101180p

Scaling analysis of the unsteady natural convection boundary layer adjacent to an inclined plate for Pr > 1 following instantaneous heating / Suvash C. Saha in Journal of heat transfer, Vol. 133 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [112501/1-9] Titre : Scaling analysis of the unsteady natural convection boundary layer adjacent to an inclined plate for Pr > 1 following instantaneous heating Type de document : texte imprimé Auteurs : Suvash C. Saha, Auteur ; Feng Xu, Auteur ; Md Mamun Molla, Auteur Année de publication : 2012 Article en page(s) : pp. [112501/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Boundary  layers  Flow  simulation  Integral  equations  Natural  convection  Navier-Stokes  equations  Numerical  analysis Index. décimale : 536 Chaleur. Thermodynamique Résumé : The unsteady natural convection boundary layer adjacent to an instantaneously heated inclined plate is investigated using an improved scaling analysis and direct numerical simulations. The development of the unsteady natural convection boundary layer following instantaneous heating may be classified into three distinct stages including a start-up stage, a transitional stage, and a steady state stage, which can be clearly identified in the analytical and numerical results. Major scaling relations of the velocity and thicknesses and the flow development time of the natural convection boundary layer are obtained using triple-layer integral solutions and verified by direct numerical simulations over a wide range of flow parameters. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...] [article] Scaling analysis of the unsteady natural convection boundary layer adjacent to an inclined plate for Pr > 1 following instantaneous heating [texte imprimé] / Suvash C. Saha, Auteur ; Feng Xu, Auteur ; Md Mamun Molla, Auteur . - 2012 . - pp. [112501/1-9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [112501/1-9] Mots-clés : Boundary  layers  Flow  simulation  Integral  equations  Natural  convection  Navier-Stokes  equations  Numerical  analysis Index. décimale : 536 Chaleur. Thermodynamique Résumé : The unsteady natural convection boundary layer adjacent to an instantaneously heated inclined plate is investigated using an improved scaling analysis and direct numerical simulations. The development of the unsteady natural convection boundary layer following instantaneous heating may be classified into three distinct stages including a start-up stage, a transitional stage, and a steady state stage, which can be clearly identified in the analytical and numerical results. Major scaling relations of the velocity and thicknesses and the flow development time of the natural convection boundary layer are obtained using triple-layer integral solutions and verified by direct numerical simulations over a wide range of flow parameters. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...]