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Adsorption thermodynamics and kinetics of uridine 5′-monophosphate on a gel-type anion exchange resin / Xiqun Zhou in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9270-9279 Titre : Adsorption thermodynamics and kinetics of uridine 5′-monophosphate on a gel-type anion exchange resin Type de document : texte imprimé Auteurs : Xiqun Zhou, Auteur ; Jiansheng Fan, Auteur ; Nan Li, Auteur Année de publication : 2011 Article en page(s) : pp. 9270-9279 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Anionic  resin  Kinetics  Adsorption Résumé : The adsorption behavior of uridine 5'-monophosphate (UMP) on a gel-type anion-exchange resin SD3 at different temperatures was investigated by the batch method. The dissociation equilibrium of UMP in aqueous solution has been studied. Effects of solution pH, contact time, and initial concentrations of UMP on the adsorption have been discussed. Adsorption equilibrium data had been fitted to three different isotherms including Langmuir, Freundlich, and Sips isotherms, which have been widely used in biosorption processes, and the accuracy for all models has been evaluated by the residual-root-mean-square error. For adsorption kinetics, the adsorption rate of UMP on the resin was interpreted by the Fick model, first- and second-order kinetic models, and the adsorption process was found to be well represented by the Fick model. The solution diffusivities of UMP at different temperatures were estimated by the Wilke-Chang equation. The sorption process was found to be controlled by the intraparticle diffusion. The Fick model and Sips isotherm were chosen to simulate the concentration diffusion of UMP on SD3 resin during the adsorption process. An intraparticle two-dimensional profile of SD3 resin at 0, 1, 4, 15, and 25 min for 293.15, 303.15, and 313.15 K was shown with a satisfactory description of the adsorption process. The thermodynamic parameters such as Gibbs free energy and enthalpy and entropy changes were calculated, and the values indicated that the adsorption process of UMP on SD3 resin was spontaneous and endothermic. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395871 [article] Adsorption thermodynamics and kinetics of uridine 5′-monophosphate on a gel-type anion exchange resin [texte imprimé] / Xiqun Zhou, Auteur ; Jiansheng Fan, Auteur ; Nan Li, Auteur . - 2011 . - pp. 9270-9279. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9270-9279 Mots-clés : Anionic  resin  Kinetics  Adsorption Résumé : The adsorption behavior of uridine 5'-monophosphate (UMP) on a gel-type anion-exchange resin SD3 at different temperatures was investigated by the batch method. The dissociation equilibrium of UMP in aqueous solution has been studied. Effects of solution pH, contact time, and initial concentrations of UMP on the adsorption have been discussed. Adsorption equilibrium data had been fitted to three different isotherms including Langmuir, Freundlich, and Sips isotherms, which have been widely used in biosorption processes, and the accuracy for all models has been evaluated by the residual-root-mean-square error. For adsorption kinetics, the adsorption rate of UMP on the resin was interpreted by the Fick model, first- and second-order kinetic models, and the adsorption process was found to be well represented by the Fick model. The solution diffusivities of UMP at different temperatures were estimated by the Wilke-Chang equation. The sorption process was found to be controlled by the intraparticle diffusion. The Fick model and Sips isotherm were chosen to simulate the concentration diffusion of UMP on SD3 resin during the adsorption process. An intraparticle two-dimensional profile of SD3 resin at 0, 1, 4, 15, and 25 min for 293.15, 303.15, and 313.15 K was shown with a satisfactory description of the adsorption process. The thermodynamic parameters such as Gibbs free energy and enthalpy and entropy changes were calculated, and the values indicated that the adsorption process of UMP on SD3 resin was spontaneous and endothermic. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395871

Comparative study on steel plate shear walls used in a high-rise building / Jianguo Nie in Journal of structural engineering, Vol. 139 N° 1 (Janvier 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 85–97 Titre : Comparative study on steel plate shear walls used in a high-rise building Type de document : texte imprimé Auteurs : Jianguo Nie, Auteur ; Jiansheng Fan, Auteur ; Xiaogang Liu, Auteur Année de publication : 2013 Article en page(s) : pp. 85–97 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Steel  plate  shear  wall  Concrete-filled  tubular  columns  Low-cycle  reverse  loading  Stiffener Résumé : Tianjin Jinta Tower is the first high-rise building built with steel plate shear walls in China. The main lateral force resisting system is the composite core tube composed of steel plate shear walls and concrete-filled steel tubular columns. To investigate the seismic performance of this structural system and to provide design instructions, two specimens of 2-bay and 5-story steel plate shear walls were tested under low-cycle reverse loading. The unstiffened steel plates of the first specimen were connected to the boundary beam and column frame by high-strength bolts. The steel plates of the second specimen were connected to the boundary frame by welding, and the steel panels were stiffened by channels. Both specimens showed satisfactory energy dissipation mechanisms during the loading process. For the unstiffened specimen with bolted connections, the considerable postbuckling strength generated excellent ductility and energy dissipation performance, but a slip at the bolted connections and the buckling of steel panels decreased the stiffness in the serviceability condition. The stiffened and welded specimen showed higher stiffness in the elastic range and excellent energy dissipation capacity, but the cost of stiffeners would decrease the economy of the steel plate shear walls. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000613 [article] Comparative study on steel plate shear walls used in a high-rise building [texte imprimé] / Jianguo Nie, Auteur ; Jiansheng Fan, Auteur ; Xiaogang Liu, Auteur . - 2013 . - pp. 85–97. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 85–97 Mots-clés : Steel  plate  shear  wall  Concrete-filled  tubular  columns  Low-cycle  reverse  loading  Stiffener Résumé : Tianjin Jinta Tower is the first high-rise building built with steel plate shear walls in China. The main lateral force resisting system is the composite core tube composed of steel plate shear walls and concrete-filled steel tubular columns. To investigate the seismic performance of this structural system and to provide design instructions, two specimens of 2-bay and 5-story steel plate shear walls were tested under low-cycle reverse loading. The unstiffened steel plates of the first specimen were connected to the boundary beam and column frame by high-strength bolts. The steel plates of the second specimen were connected to the boundary frame by welding, and the steel panels were stiffened by channels. Both specimens showed satisfactory energy dissipation mechanisms during the loading process. For the unstiffened specimen with bolted connections, the considerable postbuckling strength generated excellent ductility and energy dissipation performance, but a slip at the bolted connections and the buckling of steel panels decreased the stiffness in the serviceability condition. The stiffened and welded specimen showed higher stiffness in the elastic range and excellent energy dissipation capacity, but the cost of stiffeners would decrease the economy of the steel plate shear walls. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000613

Long-term behavior of composite beams under positive and negative bending. I, Experimental study / Jiansheng Fan in Journal of structural engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 849-857 Titre : Long-term behavior of composite beams under positive and negative bending. I, Experimental study Type de document : texte imprimé Auteurs : Jiansheng Fan, Auteur ; Jianguo Nie, Auteur ; Quanwang Li, Auteur Année de publication : 2011 Article en page(s) : pp. 849-857 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shrinkage  Creep  Crack  Composite  steel-concrete  beam  Long-term  test Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an experimental program designed to examine the long-term behavior of composite steel-concrete beams under sustained loads. The test program consisted of two simply supported beams under positive bending moments and two cantilever beams under negative bending moments. Long-term deflections, strains, and the cracking behaviors of the specimen beams were monitored over a period of 3 years. The primary observations are: (1) the deflection of the simply supported beam under positive bending moment increased quite significantly over the time due to creep and shrinkage, with the midspan deflections after 3 years of loading reached 2.5 times of the initial deflections, and (2) the cracking of concrete occurred in hogging moment regions for cantilever beams due to the combined effects of concrete shrinkage and sustained negative bending moments. Current design codes were evaluated through a comparison between the calculations and testing results. It was found that the effective modulus method provides a satisfactory prediction on deflections and strains for beams under positive bending moments. But for beams under negative bending moment, the stiffness reduction due to cracking effect should be considered in calculation. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p849_s1?isAuthorized=no [article] Long-term behavior of composite beams under positive and negative bending. I, Experimental study [texte imprimé] / Jiansheng Fan, Auteur ; Jianguo Nie, Auteur ; Quanwang Li, Auteur . - 2011 . - pp. 849-857. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 849-857 Mots-clés : Shrinkage  Creep  Crack  Composite  steel-concrete  beam  Long-term  test Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an experimental program designed to examine the long-term behavior of composite steel-concrete beams under sustained loads. The test program consisted of two simply supported beams under positive bending moments and two cantilever beams under negative bending moments. Long-term deflections, strains, and the cracking behaviors of the specimen beams were monitored over a period of 3 years. The primary observations are: (1) the deflection of the simply supported beam under positive bending moment increased quite significantly over the time due to creep and shrinkage, with the midspan deflections after 3 years of loading reached 2.5 times of the initial deflections, and (2) the cracking of concrete occurred in hogging moment regions for cantilever beams due to the combined effects of concrete shrinkage and sustained negative bending moments. Current design codes were evaluated through a comparison between the calculations and testing results. It was found that the effective modulus method provides a satisfactory prediction on deflections and strains for beams under positive bending moments. But for beams under negative bending moment, the stiffness reduction due to cracking effect should be considered in calculation. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p849_s1?isAuthorized=no

Long-term behavior of composite beams under positive and negative bending. II, Analytical study / Jiansheng Fan in Journal of structural engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 858-865 Titre : Long-term behavior of composite beams under positive and negative bending. II, Analytical study Type de document : texte imprimé Auteurs : Jiansheng Fan, Auteur ; Xin Nie, Auteur ; Li, Quan, Auteur Année de publication : 2011 Article en page(s) : pp. 858-865 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shrinkage  Creep  Effective  modulus  Cracking  Composite  beams  Serviceability Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The creep, shrinkage, and cracking of concrete may induce time-dependent changes in the stresses, internal forces, and deflections of steel-concrete composite beams. This paper presents an analytical model to consider these effects in analyzing the long-term behavior of composite beams under service loads using the step-by-step procedure. Under negative moments, the model accounts for the cracking, stress relaxing, tension stiffening, creep, and shrinkage of concrete. Meanwhile, a method is proposed to calculate the maximum crack width of the concrete slab by considering the shrinkage and creep effects. Four composite beams continuously loaded for about 3 years were analyzed using the proposed model. A good agreement is observed between the experimental results and the calculations by the proposed model. A discussion is also made about the aging coefficients in the age-adjusted effective modulus method under different loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p858_s1?isAuthorized=no [article] Long-term behavior of composite beams under positive and negative bending. II, Analytical study [texte imprimé] / Jiansheng Fan, Auteur ; Xin Nie, Auteur ; Li, Quan, Auteur . - 2011 . - pp. 858-865. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 858-865 Mots-clés : Shrinkage  Creep  Effective  modulus  Cracking  Composite  beams  Serviceability Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The creep, shrinkage, and cracking of concrete may induce time-dependent changes in the stresses, internal forces, and deflections of steel-concrete composite beams. This paper presents an analytical model to consider these effects in analyzing the long-term behavior of composite beams under service loads using the step-by-step procedure. Under negative moments, the model accounts for the cracking, stress relaxing, tension stiffening, creep, and shrinkage of concrete. Meanwhile, a method is proposed to calculate the maximum crack width of the concrete slab by considering the shrinkage and creep effects. Four composite beams continuously loaded for about 3 years were analyzed using the proposed model. A good agreement is observed between the experimental results and the calculations by the proposed model. A discussion is also made about the aging coefficients in the age-adjusted effective modulus method under different loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p858_s1?isAuthorized=no