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Effect of sorbent type on the sorption enhanced water gas shift process in a fluidized bed reactor / Yang Liu in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11989–11997 Titre : Effect of sorbent type on the sorption enhanced water gas shift process in a fluidized bed reactor Type de document : texte imprimé Auteurs : Yang Liu, Auteur ; Zhenshan Li, Auteur ; Lei Xu, Auteur Année de publication : 2012 Article en page(s) : pp. 11989–11997 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Sorption  water  gas Résumé : reactions: the WGS reaction and the CaO carbonation reaction. The WGS reaction is a surface catalytic reaction, while the CaO carbonation is a bulk reaction. This study of the SEWGS reaction in a fluidized bed reactor showed that the sorbent type has an important effect on the SEWGS reaction, with both the CaO and MgO in the sorbent catalyzing the reaction. For calcined limestone, the WGS reaction occurs on the CaO surface with CO2 sorption in situ, but the reaction rate gradually decreases with the CaO conversion due to coverage by the CaCO3 product layer on the CaO surface. Thus, the shift reaction becomes the rate limiting step. For calcined dolomite, MgO in the sorbent does not react with CO2 and can then be used as a catalyst. The shift reaction is not a limiting step, with most of the CO2 for the CaO carbonation coming from the WGS reaction on the MgO surface. Even when the CaO surface is completely covered by the CaCO3 product, the MgO in the calcined dolomite is not completely covered by the CaCO3 product and can still catalyze the WGS reaction. An important phenomenon observed was that not only CaO but also MgO experienced the decay in the catalytic reactivity after multiple cycles. The decay of catalytic reactivity of MgO in dolomite is mainly the gradual covering of the MgO surface by CaO/CaCO3 grains, so most of the MgO grains will lose contact with the CO and the steam in the gas phase. The observation of encapsulation of MgO particles by CaO or CaCO3 is also important for understanding the stabilization of synthetic calcium based sorbent with support addition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301100y [article] Effect of sorbent type on the sorption enhanced water gas shift process in a fluidized bed reactor [texte imprimé] / Yang Liu, Auteur ; Zhenshan Li, Auteur ; Lei Xu, Auteur . - 2012 . - pp. 11989–11997. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11989–11997 Mots-clés : Sorption  water  gas Résumé : reactions: the WGS reaction and the CaO carbonation reaction. The WGS reaction is a surface catalytic reaction, while the CaO carbonation is a bulk reaction. This study of the SEWGS reaction in a fluidized bed reactor showed that the sorbent type has an important effect on the SEWGS reaction, with both the CaO and MgO in the sorbent catalyzing the reaction. For calcined limestone, the WGS reaction occurs on the CaO surface with CO2 sorption in situ, but the reaction rate gradually decreases with the CaO conversion due to coverage by the CaCO3 product layer on the CaO surface. Thus, the shift reaction becomes the rate limiting step. For calcined dolomite, MgO in the sorbent does not react with CO2 and can then be used as a catalyst. The shift reaction is not a limiting step, with most of the CO2 for the CaO carbonation coming from the WGS reaction on the MgO surface. Even when the CaO surface is completely covered by the CaCO3 product, the MgO in the calcined dolomite is not completely covered by the CaCO3 product and can still catalyze the WGS reaction. An important phenomenon observed was that not only CaO but also MgO experienced the decay in the catalytic reactivity after multiple cycles. The decay of catalytic reactivity of MgO in dolomite is mainly the gradual covering of the MgO surface by CaO/CaCO3 grains, so most of the MgO grains will lose contact with the CO and the steam in the gas phase. The observation of encapsulation of MgO particles by CaO or CaCO3 is also important for understanding the stabilization of synthetic calcium based sorbent with support addition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301100y

Exploiting three-dimensional (3D) memory stacking to improve image data access efficiency for motion estimation accelerators / Yiran Li in Signal processing. Image communication, Vol. 25 N° 5 (Juin 2010) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 25 N° 5 (Juin 2010) . - pp. 335–344 Titre : Exploiting three-dimensional (3D) memory stacking to improve image data access efficiency for motion estimation accelerators Type de document : texte imprimé Auteurs : Yiran Li, Auteur ; Yang Liu, Auteur ; Tong Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 335–344 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Motion  estimation  (ME)  3D  memory  stacking Résumé : Enabled by the emerging three-dimensional (3D) integration technologies, 3D integrated computing platforms that stack high-density DRAM die(s) with a logic circuit die appear to be attractive for memory-hungry applications such as multimedia signal processing. This paper considers the design of motion estimation accelerator under a 3D logic-DRAM integrated heterogeneous multi-core system framework. In this work, we develop one specific DRAM organization and image frame storage strategy geared to motion estimation. This design strategy can seamlessly support various motion estimation algorithms and variable block size with high energy efficiency. With a DRAM performance modeling/estimation tool and ASIC design at 65 nm, we demonstrate the energy efficiency of such 3D integrated motion estimation accelerators with a case study on HDTV multi-frame motion estimation. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000469 [article] Exploiting three-dimensional (3D) memory stacking to improve image data access efficiency for motion estimation accelerators [texte imprimé] / Yiran Li, Auteur ; Yang Liu, Auteur ; Tong Zhang, Auteur . - 2012 . - pp. 335–344. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 25 N° 5 (Juin 2010) . - pp. 335–344 Mots-clés : Motion  estimation  (ME)  3D  memory  stacking Résumé : Enabled by the emerging three-dimensional (3D) integration technologies, 3D integrated computing platforms that stack high-density DRAM die(s) with a logic circuit die appear to be attractive for memory-hungry applications such as multimedia signal processing. This paper considers the design of motion estimation accelerator under a 3D logic-DRAM integrated heterogeneous multi-core system framework. In this work, we develop one specific DRAM organization and image frame storage strategy geared to motion estimation. This design strategy can seamlessly support various motion estimation algorithms and variable block size with high energy efficiency. With a DRAM performance modeling/estimation tool and ASIC design at 65 nm, we demonstrate the energy efficiency of such 3D integrated motion estimation accelerators with a case study on HDTV multi-frame motion estimation. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000469

Graphical analysis of process changes for water minimization / Xiao Feng in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7145–7151 Titre : Graphical analysis of process changes for water minimization Type de document : texte imprimé Auteurs : Xiao Feng, Auteur ; Yang Liu, Auteur ; Long Huang, Auteur Année de publication : 2009 Article en page(s) : pp. 7145–7151 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Water-using  process  Freshwater  consumption  Wastewater  generation  Inlet/outlet  concentrations Résumé : The effective changes in a water-using process can reduce freshwater consumption and wastewater generation. The main effects of process changes include the increment of limiting inlet/outlet concentrations of water-using processes and the reduction of the contaminant load of those processes. Because the water pinch of a water system is the bottleneck to limit the freshwater consumption, in this paper a water pinch diagram is used to explore the impact of process changes on the pinch point. Process changes which can move the pinch point upward and/or leftward can reduce freshwater consumption in the system. To further save freshwater in a water system, a process change which can increase limiting concentrations should be executed to an across-pinch process, and a process change which can reduce contaminant load should be executed below the pinch. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900094m [article] Graphical analysis of process changes for water minimization [texte imprimé] / Xiao Feng, Auteur ; Yang Liu, Auteur ; Long Huang, Auteur . - 2009 . - pp. 7145–7151. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7145–7151 Mots-clés : Water-using  process  Freshwater  consumption  Wastewater  generation  Inlet/outlet  concentrations Résumé : The effective changes in a water-using process can reduce freshwater consumption and wastewater generation. The main effects of process changes include the increment of limiting inlet/outlet concentrations of water-using processes and the reduction of the contaminant load of those processes. Because the water pinch of a water system is the bottleneck to limit the freshwater consumption, in this paper a water pinch diagram is used to explore the impact of process changes on the pinch point. Process changes which can move the pinch point upward and/or leftward can reduce freshwater consumption in the system. To further save freshwater in a water system, a process change which can increase limiting concentrations should be executed to an across-pinch process, and a process change which can reduce contaminant load should be executed below the pinch. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900094m