Documents disponibles écrits par cet auteur

Coating of TiO2 Thin Films on the Surface of SiO2 Microspheres: Toward Industrial Photocatalysis / Gang Li in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p 8228–8232 Titre : Coating of TiO2 Thin Films on the Surface of SiO2 Microspheres: Toward Industrial Photocatalysis Type de document : texte imprimé Auteurs : Gang Li, Auteur ; Renbi Bai, Auteur ; X. S. Zhao, Auteur Année de publication : 2008 Article en page(s) : p 8228–8232 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Surface  of  SiO2  Treating  wastewater. Résumé : A core/shell SiO2/TiO2 photocatalyst was prepared using a liquid-phase deposition (LPD) method. Zeta-potential measurement showed that deposition of a layer of polyelectrolyte on the surface of SiO2 microspheres was a prerequisite for subsequent deposition of the TiO2 shell with a controllable and uniform thickness. The photocatalytic activity of the core/shell SiO2/TiO2 catalyst for decomposition of Orange II in liquid phase was observed to be comparable with that of P25 (a commercial TiO2 product of Degussa). Experimental data also showed that the SiO2/TiO2 core/shell nanostructured photocatalyst can be easily separated from the reaction medium by sedimentation, and the solid can be recycled and reused. Thus, the photocatalyst described in this work represents a new catalyst system with a high potential for practical applications in treating wastewater. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800561y [article] Coating of TiO2 Thin Films on the Surface of SiO2 Microspheres: Toward Industrial Photocatalysis [texte imprimé] / Gang Li, Auteur ; Renbi Bai, Auteur ; X. S. Zhao, Auteur . - 2008 . - p 8228–8232. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p 8228–8232 Mots-clés : Surface  of  SiO2  Treating  wastewater. Résumé : A core/shell SiO2/TiO2 photocatalyst was prepared using a liquid-phase deposition (LPD) method. Zeta-potential measurement showed that deposition of a layer of polyelectrolyte on the surface of SiO2 microspheres was a prerequisite for subsequent deposition of the TiO2 shell with a controllable and uniform thickness. The photocatalytic activity of the core/shell SiO2/TiO2 catalyst for decomposition of Orange II in liquid phase was observed to be comparable with that of P25 (a commercial TiO2 product of Degussa). Experimental data also showed that the SiO2/TiO2 core/shell nanostructured photocatalyst can be easily separated from the reaction medium by sedimentation, and the solid can be recycled and reused. Thus, the photocatalyst described in this work represents a new catalyst system with a high potential for practical applications in treating wastewater. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800561y

Experimental investigation into the production behavior of methane hydrate in porous sediment with hot brine stimulation / Xiao-Sen Li in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9696–9702 Titre : Experimental investigation into the production behavior of methane hydrate in porous sediment with hot brine stimulation Type de document : texte imprimé Auteurs : Xiao-Sen Li, Auteur ; Li-Hua Wan, Auteur ; Gang Li, Auteur Année de publication : 2009 Article en page(s) : p. 9696–9702 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Experimental  investigation  Methane  hydrate  Porous  sediment  Hot  brine  stimulation Résumé : The gas production behavior from methane hydrate in porous sediment by injecting the brine with the salinity of 0−24 wt % and the temperature of −1 to 130 °C was investigated in a one-dimensional experimental apparatus. The results show that the gas production process consists of three periods: the free gas production, the hydrate dissociation, and the general gas reservoir production. The hydrate dissociation accompanies the temperature decrease with the injection of the brine (NaCl solution), and the dissociation duration is shortened with the increase of the salinity. With the injection of hot brine, instantaneous hydrate dissociation rate also increases with the increase of the salinity. However, while the NaCl concentration is beyond a certain value, the rate has no longer continued increasing. Thermal efficiency and energy ratio for the hydrate production can be enhanced by injecting hot brine, and the enhanced effectiveness is quite good with the injection of high salinity at lower temperature. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8009582 [article] Experimental investigation into the production behavior of methane hydrate in porous sediment with hot brine stimulation [texte imprimé] / Xiao-Sen Li, Auteur ; Li-Hua Wan, Auteur ; Gang Li, Auteur . - 2009 . - p. 9696–9702. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9696–9702 Mots-clés : Experimental  investigation  Methane  hydrate  Porous  sediment  Hot  brine  stimulation Résumé : The gas production behavior from methane hydrate in porous sediment by injecting the brine with the salinity of 0−24 wt % and the temperature of −1 to 130 °C was investigated in a one-dimensional experimental apparatus. The results show that the gas production process consists of three periods: the free gas production, the hydrate dissociation, and the general gas reservoir production. The hydrate dissociation accompanies the temperature decrease with the injection of the brine (NaCl solution), and the dissociation duration is shortened with the increase of the salinity. With the injection of hot brine, instantaneous hydrate dissociation rate also increases with the increase of the salinity. However, while the NaCl concentration is beyond a certain value, the rate has no longer continued increasing. Thermal efficiency and energy ratio for the hydrate production can be enhanced by injecting hot brine, and the enhanced effectiveness is quite good with the injection of high salinity at lower temperature. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8009582

Integrated reliability-based seismic drift design optimization of base-isolated concrete buildings / Xiao-Kang Zou in Journal of structural engineering, Vol. 136 N° 10 (Octobre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1282-1295 Titre : Integrated reliability-based seismic drift design optimization of base-isolated concrete buildings Type de document : texte imprimé Auteurs : Xiao-Kang Zou, Auteur ; Qian Wang, Auteur ; Gang Li, Auteur Année de publication : 2011 Article en page(s) : pp. 1282-1295 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Response  spectrum  analysis  Reliability  Structural  optimization  Optimality  criteria  method  Principle  of  virtual  work  Drift  design  Base  isolation  Earthquakes  Concrete  FORM  method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an effective numerical reliability-based optimization technique for the design of base-isolated concrete building structures under spectrum loading. Attempts have been made to automate the integrated spectrum analysis, reliability analysis, and design optimization procedure and to minimize the total cost of the base-isolated building subjected to multiple design performance criteria in terms of the story drift of the superstructure and lateral displacement of the isolation system or corresponding reliability constraints. In the optimal design formulation, the cost of the superstructure can be expressed in terms of concrete member sizes while assuming all these members to be linear elastic under a specified design earthquake. However, the base isolation is assumed to behave nonlinearly and its cost can be related to the effective horizontal stiffness of each isolator. Based on the principle of virtual work, the drift responses and corresponding reliability indexes can be explicitly formulated and the integrated optimization problem can be solved by an optimality criteria method. The technique is capable of achieving the optimal balance between the costs of the superstructure and isolation systems while the seismic drift performance or corresponding reliability of a building can be simultaneously considered. An illustrative example shows that conventional deterministic design optimization cannot ensure designs with satisfactory reliability levels, whereas the reliability-based design optimization can achieve the objective when uncertainties are considered. It is believed that such an optimization technique provides an effective tool for seismic design of building structures. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i10/p1282_s1?isAuthorized=no [article] Integrated reliability-based seismic drift design optimization of base-isolated concrete buildings [texte imprimé] / Xiao-Kang Zou, Auteur ; Qian Wang, Auteur ; Gang Li, Auteur . - 2011 . - pp. 1282-1295. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1282-1295 Mots-clés : Response  spectrum  analysis  Reliability  Structural  optimization  Optimality  criteria  method  Principle  of  virtual  work  Drift  design  Base  isolation  Earthquakes  Concrete  FORM  method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an effective numerical reliability-based optimization technique for the design of base-isolated concrete building structures under spectrum loading. Attempts have been made to automate the integrated spectrum analysis, reliability analysis, and design optimization procedure and to minimize the total cost of the base-isolated building subjected to multiple design performance criteria in terms of the story drift of the superstructure and lateral displacement of the isolation system or corresponding reliability constraints. In the optimal design formulation, the cost of the superstructure can be expressed in terms of concrete member sizes while assuming all these members to be linear elastic under a specified design earthquake. However, the base isolation is assumed to behave nonlinearly and its cost can be related to the effective horizontal stiffness of each isolator. Based on the principle of virtual work, the drift responses and corresponding reliability indexes can be explicitly formulated and the integrated optimization problem can be solved by an optimality criteria method. The technique is capable of achieving the optimal balance between the costs of the superstructure and isolation systems while the seismic drift performance or corresponding reliability of a building can be simultaneously considered. An illustrative example shows that conventional deterministic design optimization cannot ensure designs with satisfactory reliability levels, whereas the reliability-based design optimization can achieve the objective when uncertainties are considered. It is believed that such an optimization technique provides an effective tool for seismic design of building structures. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i10/p1282_s1?isAuthorized=no

Numerical simulation of gas production from natural gas hydrate using a single horizontal well by depressurization in qilian mountain permafrost / Xiao-Sen Li in Industrial & engineering chemistry research, Vol. 51 N° 11 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4424-4432 Titre : Numerical simulation of gas production from natural gas hydrate using a single horizontal well by depressurization in qilian mountain permafrost Type de document : texte imprimé Auteurs : Xiao-Sen Li, Auteur ; Bo Yang, Auteur ; Gang Li, Auteur Année de publication : 2012 Article en page(s) : pp. 4424-4432 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mountain  Depressurization  Gas  hydrates  Natural  gas  Production  Numerical  simulation Résumé : In November 2008, gas hydrate samples were recovered during the scientific expedition conducted in the Qilian Mountain Permafrost It is expected that this area will become a strategic area of gas hydrate production in China. However, the evaluation of the hydrate deposits in the area as a potential energy resource has not been completed. Using numerical simulation and currently available data from site measurements, we preliminarily estimate the gas production potential of these hydrate reservoirs. The cumulative volume of the produced CH4 at the well in the early production period (0―10 years) is more than 50% of the total gas production from the well. The gas hydrate dissociation mainly occurs in the vicinity of the horizontal well and along a cylindrical interface. There is a ringlike structure of ice around the horizontal well during the gas production process. With the decrease of the gas production rate, the ice starts to melt from the bottom to the top under the influence of the geothermal gradient The sensitivity analysis demonstrates the dependence of production on the intrinsic permeability and the initial deposit temperature. Economic assessment based on the cumulative volumetric gas production and the gas-to-water ratio indicates that it is not economically viable to produce gas from this hydrate deposit using single horizontal well by depressurization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655650 [article] Numerical simulation of gas production from natural gas hydrate using a single horizontal well by depressurization in qilian mountain permafrost [texte imprimé] / Xiao-Sen Li, Auteur ; Bo Yang, Auteur ; Gang Li, Auteur . - 2012 . - pp. 4424-4432. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4424-4432 Mots-clés : Mountain  Depressurization  Gas  hydrates  Natural  gas  Production  Numerical  simulation Résumé : In November 2008, gas hydrate samples were recovered during the scientific expedition conducted in the Qilian Mountain Permafrost It is expected that this area will become a strategic area of gas hydrate production in China. However, the evaluation of the hydrate deposits in the area as a potential energy resource has not been completed. Using numerical simulation and currently available data from site measurements, we preliminarily estimate the gas production potential of these hydrate reservoirs. The cumulative volume of the produced CH4 at the well in the early production period (0―10 years) is more than 50% of the total gas production from the well. The gas hydrate dissociation mainly occurs in the vicinity of the horizontal well and along a cylindrical interface. There is a ringlike structure of ice around the horizontal well during the gas production process. With the decrease of the gas production rate, the ice starts to melt from the bottom to the top under the influence of the geothermal gradient The sensitivity analysis demonstrates the dependence of production on the intrinsic permeability and the initial deposit temperature. Economic assessment based on the cumulative volumetric gas production and the gas-to-water ratio indicates that it is not economically viable to produce gas from this hydrate deposit using single horizontal well by depressurization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655650

On the number of state variables in options pricing / Gang Li in Management science, Vol. 56 N° 11 (Novembre 2010) 

Public ISBD [article]  in Management science > Vol. 56 N° 11 (Novembre 2010) . - pp. 2058-2075 Titre : On the number of state variables in options pricing Type de document : texte imprimé Auteurs : Gang Li, Auteur ; Chu Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 2058-2075 Note générale : Management Langues : Anglais (eng) Mots-clés : Options  pricing  State  variables  Nonparametric  method  Nonlinear  principal  component  analysis Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : n this paper, we investigate the methodological issue of determining the number of state variables required for options pricing. After showing the inadequacy of the principal component analysis approach, which is commonly used in the literature, we adopt a nonparametric regression technique with nonlinear principal components extracted from the implied volatilities of various moneyness and maturities as proxies for the transformed state variables. The methodology is applied to the prices of S&P 500 index options from the period 1996–2005. We find that, in addition to the index value itself, two state variables, approximated by the first two nonlinear principal components, are adequate for pricing the index options and fitting the data in both time series and cross sections. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/cgi/content/abstract/56/11/2058 [article] On the number of state variables in options pricing [texte imprimé] / Gang Li, Auteur ; Chu Zhang, Auteur . - 2011 . - pp. 2058-2075. Management Langues : Anglais (eng) in Management science > Vol. 56 N° 11 (Novembre 2010) . - pp. 2058-2075 Mots-clés : Options  pricing  State  variables  Nonparametric  method  Nonlinear  principal  component  analysis Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : n this paper, we investigate the methodological issue of determining the number of state variables required for options pricing. After showing the inadequacy of the principal component analysis approach, which is commonly used in the literature, we adopt a nonparametric regression technique with nonlinear principal components extracted from the implied volatilities of various moneyness and maturities as proxies for the transformed state variables. The methodology is applied to the prices of S&P 500 index options from the period 1996–2005. We find that, in addition to the index value itself, two state variables, approximated by the first two nonlinear principal components, are adequate for pricing the index options and fitting the data in both time series and cross sections. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/cgi/content/abstract/56/11/2058

Output relevant fault reconstruction and fault subspace extraction in total projection to latent structures models / Gang Li in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

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Seismic response of single-degree-of-freedom systems representing low-ductility steel concentrically braced frames with reserve capacity / Gang Li in Journal of structural engineering, Vol. 139 N° 2 (Février 2013) 

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