Aggregation of hydrophobic substituents of poly(acrylate)s and their competitive complexation by β- and γ-cyclodextrins and their linked dimers in aqueous solution / Jie Wang in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7566–7571 Titre : Aggregation of hydrophobic substituents of poly(acrylate)s and their competitive complexation by β- and γ-cyclodextrins and their linked dimers in aqueous solution Type de document : texte imprimé Auteurs : Jie Wang, Auteur ; Li, L., Auteur ; Xuhong Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 7566–7571 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrophobic substituents Aqueous solution Résumé : Competition between the aggregation of the octadecyl substituents of 3% randomly substituted poly(acrylate), PAAC18, and of the dodecyl substituents of the PAAC12 analogue, and their complexation by β-cyclodextrin, βCD, the linked dimers, N,N′-bis(6A-deoxy-6A-β-cyclodextrin)urea, 66βCD2ur, and N,N′-bis(6A-deoxy-6A-β-cyclodextrin)succinamide, 66βCD2su, and γ-cyclodextrin, γCD, and the analogous dimers 66γCD2ur and 66γCD2su have been studied in aqueous solution. The zero-shear viscosities of 3.3 wt % aqueous solutions of PAAC18, decreases in the presence of βCD, 66βCD2ur, 66βCD2su and γCD, is little changed in the presence of 66γCD2ur, and increases in the presence of 66γCD2su. In contrast, the zero-shear viscosities of aqueous solutions of PAAC12 increase in the presence of βCD, γCD, and their dimers but they are much less than those of the corresponding PAAC18 solutions. These macroscopic variations are due to host–guest complexation of the octadecyl and dodecyl substituents by βCD, γCD, and their dimers (as shown by 2D 1H NOESY NMR spectroscopy) competing with aggregation of the octadecyl and dodecyl substituents where differences in substituent length and cyclodextrin annular size are dominant factors. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101705e [article] Aggregation of hydrophobic substituents of poly(acrylate)s and their competitive complexation by β- and γ-cyclodextrins and their linked dimers in aqueous solution [texte imprimé] / Jie Wang, Auteur ; Li, L., Auteur ; Xuhong Guo, Auteur . - 2011 . - pp. 7566–7571. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7566–7571 Mots-clés : Hydrophobic substituents Aqueous solution Résumé : Competition between the aggregation of the octadecyl substituents of 3% randomly substituted poly(acrylate), PAAC18, and of the dodecyl substituents of the PAAC12 analogue, and their complexation by β-cyclodextrin, βCD, the linked dimers, N,N′-bis(6A-deoxy-6A-β-cyclodextrin)urea, 66βCD2ur, and N,N′-bis(6A-deoxy-6A-β-cyclodextrin)succinamide, 66βCD2su, and γ-cyclodextrin, γCD, and the analogous dimers 66γCD2ur and 66γCD2su have been studied in aqueous solution. The zero-shear viscosities of 3.3 wt % aqueous solutions of PAAC18, decreases in the presence of βCD, 66βCD2ur, 66βCD2su and γCD, is little changed in the presence of 66γCD2ur, and increases in the presence of 66γCD2su. In contrast, the zero-shear viscosities of aqueous solutions of PAAC12 increase in the presence of βCD, γCD, and their dimers but they are much less than those of the corresponding PAAC18 solutions. These macroscopic variations are due to host–guest complexation of the octadecyl and dodecyl substituents by βCD, γCD, and their dimers (as shown by 2D 1H NOESY NMR spectroscopy) competing with aggregation of the octadecyl and dodecyl substituents where differences in substituent length and cyclodextrin annular size are dominant factors. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101705e

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Contact area and static friction of rough surfaces with high plasticity index / Li, L. in Transactions of the ASME . Journal of tribology, Vol. 132 N° 3 (Juillet 2010)  

Public ISBD [article]  inTransactions of the ASME . Journal of tribology > Vol. 132 N° 3 (Juillet 2010) . - 10 p. Titre : Contact area and static friction of rough surfaces with high plasticity index Type de document : texte imprimé Auteurs : Li, L., Auteur ; I. Etsion, Auteur ; F. E. Talke, Auteur Année de publication : 2011 Article en page(s) : 10 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : plasticity rough surfaces stiction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A model for the contact area and static friction of nominally flat rough surfaces and rough spherical surfaces is presented. The model extends previously published models, which are limited to plasticity index values below 8, to higher plasticity index values by accounting for fully plastically deformed asperities based on finite element results by Jackson and Green [2005, “A Finite Element Study of Elasto-Plastic Hemispherical Contact Against a Rigid Flat,” Trans. ASME, J. Tribol., 127, pp. 343–354]. The present model also corrects some deficiencies of the earlier models at very small plasticity index values below 0.5. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Contact area and static friction of rough surfaces with high plasticity index [texte imprimé] / Li, L., Auteur ; I. Etsion, Auteur ; F. E. Talke, Auteur . - 2011 . - 10 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 3 (Juillet 2010) . - 10 p. Mots-clés : plasticity rough surfaces stiction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A model for the contact area and static friction of nominally flat rough surfaces and rough spherical surfaces is presented. The model extends previously published models, which are limited to plasticity index values below 8, to higher plasticity index values by accounting for fully plastically deformed asperities based on finite element results by Jackson and Green [2005, “A Finite Element Study of Elasto-Plastic Hemispherical Contact Against a Rigid Flat,” Trans. ASME, J. Tribol., 127, pp. 343–354]. The present model also corrects some deficiencies of the earlier models at very small plasticity index values below 0.5. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

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Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution / B. B. Zhang in Materials and corrosion, Vol. 62 N° 8 (Août 2011)  

Public ISBD [article]  inMaterials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 766-770 Titre : Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution Type de document : texte imprimé Auteurs : B. B. Zhang, Auteur ; B. L. Wang, Auteur ; Li, L., Auteur Année de publication : 2011 Article en page(s) : pp. 766-770 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion Electrochemical impedance Microstructure Ti–Ag–Fe alloy Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion behavior of Ti–5Ag–xFe alloys (x = 1, 2.5, 5 wt%) in neutral saline solution was investigated by the open-circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and potentiostatic tests. The microstructural observation indicated that β-Ti phase was retained by the addition of Fe into Ti–Ag alloys. Compared with commercially pure (CP) Ti, Ti–5Ag–xFe alloys exhibited higher corrosion potentials, lower current densities, and larger impedance, these suggested that Ti–5Ag–xFe alloys have nobler electrochemical corrosion behavior when compared with CP Ti in neutral saline solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905561/abstract [article] Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution [texte imprimé] / B. B. Zhang, Auteur ; B. L. Wang, Auteur ; Li, L., Auteur . - 2011 . - pp. 766-770. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 766-770 Mots-clés : Corrosion Electrochemical impedance Microstructure Ti–Ag–Fe alloy Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion behavior of Ti–5Ag–xFe alloys (x = 1, 2.5, 5 wt%) in neutral saline solution was investigated by the open-circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and potentiostatic tests. The microstructural observation indicated that β-Ti phase was retained by the addition of Fe into Ti–Ag alloys. Compared with commercially pure (CP) Ti, Ti–5Ag–xFe alloys exhibited higher corrosion potentials, lower current densities, and larger impedance, these suggested that Ti–5Ag–xFe alloys have nobler electrochemical corrosion behavior when compared with CP Ti in neutral saline solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905561/abstract

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Error assessment for spectral representation method in wind velocity field simulation / Liang Hu in Journal of engineering mechanics, Vol. 136 N° 9 (Septembre 2010)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 136 N° 9 (Septembre 2010) . - pp. 1090-1104 Titre : Error assessment for spectral representation method in wind velocity field simulation Type de document : texte imprimé Auteurs : Liang Hu, Auteur ; Li, L., Auteur ; Ming Gu, Auteur Article en page(s) : pp. 1090-1104 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Simulation Spectral analysis Errors Wind velocity. Résumé : Stochastic wind velocity fields are usually simulated as N-variate stationary Gaussian processes by using the spectral representation method (SRM). However, the temporal statistics estimated from one SRM-simulated sample wind process cannot coincide with the target characteristics; the disagreements can be described by the bias and stochastic errors. For controlling the errors efficiently, this paper assesses the errors produced by both the Cholesky decomposition-based SRM (CSRM) and the eigendecomposition-based SRM (ESRM). The SRM is revisited first, followed by computing the temporal mean value, correlation function, power spectral density (PSD), and standard deviation of the SRM-simulated wind process. It is shown that the temporal correlation function and standard deviation are Gaussian, while the temporal PSD is non-Gaussian. Further, as mathematical expectations and standard deviations of the corresponding temporal estimations, the bias errors and stochastic errors of all the first- and second-order statistics are obtained in closed form for both the CSRM and the ESRM; the closed-form solutions are then verified in the numerical example. More importantly, this example is employed for taking a clear look at and making a comparison between the stochastic errors produced by the CSRM and by the ESRM; observations suggest that (1) in sum, the ESRM produces smaller stochastic errors than the CSRM and (2) if the ESRM is employed, stochastic errors will be distributed to each component of the wind process in a more uniform pattern. Moreover, some practical approaches are proposed to control the stochastic errors. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Error assessment for spectral representation method in wind velocity field simulation [texte imprimé] / Liang Hu, Auteur ; Li, L., Auteur ; Ming Gu, Auteur . - pp. 1090-1104. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 9 (Septembre 2010) . - pp. 1090-1104 Mots-clés : Simulation Spectral analysis Errors Wind velocity. Résumé : Stochastic wind velocity fields are usually simulated as N-variate stationary Gaussian processes by using the spectral representation method (SRM). However, the temporal statistics estimated from one SRM-simulated sample wind process cannot coincide with the target characteristics; the disagreements can be described by the bias and stochastic errors. For controlling the errors efficiently, this paper assesses the errors produced by both the Cholesky decomposition-based SRM (CSRM) and the eigendecomposition-based SRM (ESRM). The SRM is revisited first, followed by computing the temporal mean value, correlation function, power spectral density (PSD), and standard deviation of the SRM-simulated wind process. It is shown that the temporal correlation function and standard deviation are Gaussian, while the temporal PSD is non-Gaussian. Further, as mathematical expectations and standard deviations of the corresponding temporal estimations, the bias errors and stochastic errors of all the first- and second-order statistics are obtained in closed form for both the CSRM and the ESRM; the closed-form solutions are then verified in the numerical example. More importantly, this example is employed for taking a clear look at and making a comparison between the stochastic errors produced by the CSRM and by the ESRM; observations suggest that (1) in sum, the ESRM produces smaller stochastic errors than the CSRM and (2) if the ESRM is employed, stochastic errors will be distributed to each component of the wind process in a more uniform pattern. Moreover, some practical approaches are proposed to control the stochastic errors. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

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Horizontal pressure on barricades for backfilled stopes. Part I, Fully drained conditions / Li, L. in Canadian geotechnical journal, Vol. 46 N° 1 (Janvier 2009)  

Public ISBD [article]  inCanadian geotechnical journal > Vol. 46 N° 1 (Janvier 2009) . - pp. 37–46 Titre : Horizontal pressure on barricades for backfilled stopes. Part I, Fully drained conditions Type de document : texte imprimé Auteurs : Li, L., Auteur ; Michel Aubertin, Auteur Article en page(s) : pp. 37–46 Note générale : Sciences de la Terre Langues : Anglais (eng) Mots-clés : Mine stope Backfill Barricades Earth pressure Analytical solution Numerical modelling Chantier minier Remblais barricades Pression des terres Solution analytique Modélisation numérique Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : Stope backfilling is used in underground mines to provide a safer working space for personnel and machinery. To ensure a secure application of backfill, it is critical to accurately evaluate the pressures exerted on the walls and barricades placed near the base of the stope to retain the fill materials. In this paper, existing solutions for evaluating the stresses on barricades are reviewed. The authors then propose a new three-dimensional analytical solution that takes into account the stress transfer from the backfill to the walls in both the stope and access drift. In particular, the solution considers the influence of the barricade position within the drift on the stress state. Comparisons are made between the proposed solution, physical model test results, and numerical simulations. The good agreement between various results indicates that the proposed formulation provides a good estimate of the pressure on a barricade. The solution presented here is applicable to fully drained backfill (without water-pore pressure); the solution for saturated backfill is given in a companion paper (see Part II, this issue). Le remblayage des chantiers est utilisé dans les mines souterraines afin de maintenir un espace de travail sécuritaire pour le personnel et les équipements. Afin d'assurer une bonne performance du remblai, il est essentiel d'évaluer de façon représentative la pression exercée sur les murs et sur les barricades installées près de la base du chantier pour retenir les matériaux de remblayage. Dans cet article, des solutions existantes pour évaluer les pressions sur les barricades sont revues. Les auteurs proposent ensuite une nouvelle solution analytique tridimensionnelle qui prend en compte le transfert des contraintes du remblai aux parois dans le chantier remblayé et dans la galerie. Cette solution tient compte l'influence de la position des barricades sur l'ampleur des contraintes. Des comparaisons sont faites entre la solution analytique, des résultats d'essais sur un modèle physique et des simulations numériques. La bonne concordance entre ces divers résultats indique que la formulation proposée représente bien la pression exercée sur les barricades. La solution présentée ici est applicable aux remblais drainés (sans pression interstitielle); une solution pour les remblais saturés est donnée dans un article complémentaire (voir Partie II, ce numéro). DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...] [article] Horizontal pressure on barricades for backfilled stopes. Part I, Fully drained conditions [texte imprimé] / Li, L., Auteur ; Michel Aubertin, Auteur . - pp. 37–46. Sciences de la Terre Langues : Anglais (eng) in Canadian geotechnical journal > Vol. 46 N° 1 (Janvier 2009) . - pp. 37–46 Mots-clés : Mine stope Backfill Barricades Earth pressure Analytical solution Numerical modelling Chantier minier Remblais barricades Pression des terres Solution analytique Modélisation numérique Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : Stope backfilling is used in underground mines to provide a safer working space for personnel and machinery. To ensure a secure application of backfill, it is critical to accurately evaluate the pressures exerted on the walls and barricades placed near the base of the stope to retain the fill materials. In this paper, existing solutions for evaluating the stresses on barricades are reviewed. The authors then propose a new three-dimensional analytical solution that takes into account the stress transfer from the backfill to the walls in both the stope and access drift. In particular, the solution considers the influence of the barricade position within the drift on the stress state. Comparisons are made between the proposed solution, physical model test results, and numerical simulations. The good agreement between various results indicates that the proposed formulation provides a good estimate of the pressure on a barricade. The solution presented here is applicable to fully drained backfill (without water-pore pressure); the solution for saturated backfill is given in a companion paper (see Part II, this issue). Le remblayage des chantiers est utilisé dans les mines souterraines afin de maintenir un espace de travail sécuritaire pour le personnel et les équipements. Afin d'assurer une bonne performance du remblai, il est essentiel d'évaluer de façon représentative la pression exercée sur les murs et sur les barricades installées près de la base du chantier pour retenir les matériaux de remblayage. Dans cet article, des solutions existantes pour évaluer les pressions sur les barricades sont revues. Les auteurs proposent ensuite une nouvelle solution analytique tridimensionnelle qui prend en compte le transfert des contraintes du remblai aux parois dans le chantier remblayé et dans la galerie. Cette solution tient compte l'influence de la position des barricades sur l'ampleur des contraintes. Des comparaisons sont faites entre la solution analytique, des résultats d'essais sur un modèle physique et des simulations numériques. La bonne concordance entre ces divers résultats indique que la formulation proposée représente bien la pression exercée sur les barricades. La solution présentée ici est applicable aux remblais drainés (sans pression interstitielle); une solution pour les remblais saturés est donnée dans un article complémentaire (voir Partie II, ce numéro). DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...]

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Horizontal pressure on barricades for backfilled stopes. Part II, Submerged conditions / Li, L. in Canadian geotechnical journal, Vol. 46 N° 1 (Janvier 2009)  

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Neuro-fuzzy dynamic-inversion-based adaptive control for robotic manipulators—discrete time case / Sun, Fuchun in IEEE transactions on industrial electronics, Vol. 54 N°3 (Juin 2007)  

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A note on the Hertz contact model with nonlinear damping for pounding simulation / Kun Ye in Earthquake engineering structural dynamics, Vol. 38 N° 9 (Juillet 2009)  

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Synthesis of spherical polyelectrolyte brushes by photoemulsion polymerization with different photoinitiators / Xiang Wang in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011)  

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Two-Dimensional Approximation for Tidal dynamics in Coastal Aquifers: Capillarity Correction / D.-S. Jeng in Journal of engineering mechanics, Vol.131, N°5 (Mai 2005)

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