Documents disponibles écrits par cet auteur

Correlation of solubility and prediction of the mixing properties of ginsenoside compound K in various solvents / Runyan Li in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8141-8148 Titre : Correlation of solubility and prediction of the mixing properties of ginsenoside compound K in various solvents Type de document : texte imprimé Auteurs : Runyan Li, Auteur ; Hao Yan, Auteur ; Zhao Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 8141-8148 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mixing  Prediction  Solubility  Correlation  analysis  Correlation Résumé : The solubilities of ginsenoside compound K in pure solvents and binary mixture solvents were determined at several temperatures from 278.15 K to 318.15 K by a static analytical method. The experimental solubility data in pure solvents were correlated by the van't Hoff plot, the modified Apelblat equation, the λh (Buchowski) equation, the Wilson model, and the NRTL model, with the Wilson model giving the best correlation results. Based on the Wilson model and experimental data, the mixing Gibbs free energies, enthalpies, and entropies of solutions and activity coefficients in pure solvents were predicted, and other thermodynamic properties (infinite-dilution activity coefficients and excess enthalpies) were calculated as well. In addition, the solubility was maximal at a certain water mole fraction in acetone + water mixture and acetonitrile + water mixture, whereas in a methanol + water system, the solubility decreases as the water concentration increases monotonically. The solubilities in mixture solvents were correlated by the solvent components using the Wilson model. The partial molar Gibbs free energies with negative values were obtained, which indicates the changing of the solubility. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990327 [article] Correlation of solubility and prediction of the mixing properties of ginsenoside compound K in various solvents [texte imprimé] / Runyan Li, Auteur ; Hao Yan, Auteur ; Zhao Wang, Auteur . - 2012 . - pp. 8141-8148. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8141-8148 Mots-clés : Mixing  Prediction  Solubility  Correlation  analysis  Correlation Résumé : The solubilities of ginsenoside compound K in pure solvents and binary mixture solvents were determined at several temperatures from 278.15 K to 318.15 K by a static analytical method. The experimental solubility data in pure solvents were correlated by the van't Hoff plot, the modified Apelblat equation, the λh (Buchowski) equation, the Wilson model, and the NRTL model, with the Wilson model giving the best correlation results. Based on the Wilson model and experimental data, the mixing Gibbs free energies, enthalpies, and entropies of solutions and activity coefficients in pure solvents were predicted, and other thermodynamic properties (infinite-dilution activity coefficients and excess enthalpies) were calculated as well. In addition, the solubility was maximal at a certain water mole fraction in acetone + water mixture and acetonitrile + water mixture, whereas in a methanol + water system, the solubility decreases as the water concentration increases monotonically. The solubilities in mixture solvents were correlated by the solvent components using the Wilson model. The partial molar Gibbs free energies with negative values were obtained, which indicates the changing of the solubility. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990327

Hydraulic behavior of filter protected silt under cyclic flow / Lun Chen in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 8 (Août 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1159–1166 Titre : Hydraulic behavior of filter protected silt under cyclic flow Type de document : texte imprimé Auteurs : Lun Chen, Auteur ; Yan-Feng Zhuang, Auteur ; Zhao Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 1159–1166 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Soil  water  Filtration  Hydraulic  gradients  Silts Résumé : The spatial distribution of hydraulic gradients within a soil sample under cyclic flow with different frequencies was measured and compared with calculated results. The permeability within the soil before and after cyclic flow was compared. This study shows that a lower ratio of consolidation coefficient of the soil to the angular velocity of cyclic flow will result in higher hydraulic gradients at the boundaries, and lower gradients within the soil. This study suggests that besides geometrical parameters of soil and geosynthetics, the consolidation coefficient of the soil and the frequency of cyclic flow need to be considered as well in the design of filters under cyclic flow. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000009 [article] Hydraulic behavior of filter protected silt under cyclic flow [texte imprimé] / Lun Chen, Auteur ; Yan-Feng Zhuang, Auteur ; Zhao Wang, Auteur . - 2009 . - pp. 1159–1166. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1159–1166 Mots-clés : Soil  water  Filtration  Hydraulic  gradients  Silts Résumé : The spatial distribution of hydraulic gradients within a soil sample under cyclic flow with different frequencies was measured and compared with calculated results. The permeability within the soil before and after cyclic flow was compared. This study shows that a lower ratio of consolidation coefficient of the soil to the angular velocity of cyclic flow will result in higher hydraulic gradients at the boundaries, and lower gradients within the soil. This study suggests that besides geometrical parameters of soil and geosynthetics, the consolidation coefficient of the soil and the frequency of cyclic flow need to be considered as well in the design of filters under cyclic flow. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000009