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Computational fluid dynamics study of a noncontact handling device using air-swirling flow / Xin Li in Journal of engineering mechanics, Vol. 137 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 6 (Juin 2011) . - pp.400-409 Titre : Computational fluid dynamics study of a noncontact handling device using air-swirling flow Type de document : texte imprimé Auteurs : Xin Li, Auteur ; Shouichiro Iio, Auteur ; Kenji Kawashima, Auteur Année de publication : 2011 Article en page(s) : pp.400-409 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Vortex  levitation  Vortex  gripper  Noncontact  handling,  Air-swirling  flow  Computational  fluid  dynamics  (CFD) Résumé : The vortex gripper is a recently developed pneumatic noncontact handling device that takes advantage of air-swirling flow to cause upward lifting force and that thereby can pick up and hold a work piece placed underneath without any contact. It is applicable where, e.g., in the semiconductor wafer manufacturing process, contact should be avoided during handling and moving in order to minimize damage to a work piece. For the purpose of a full understanding of the mechanism of the vortex gripper, a computational fluid dynamics (CFD) study was conducted in this paper, and at the same time, experimental work was carried out to measure the pressure distribution on the upper surface of the work piece. First, three turbulence models were used for simulation and verified by comparison with the experimental pressure distribution. It is known that the Reynolds stress transport model (RSTM) can reproduce the real distribution better. Then, on the basis of the experimental and numerical result of RSTM, an insight into the vortex gripper and its flow phenomena, including flow structure, spatial velocity, and pressure distributions, and an investigation into the influence of clearance variation was given. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i6/p400_s1?isAuthorized=no [article] Computational fluid dynamics study of a noncontact handling device using air-swirling flow [texte imprimé] / Xin Li, Auteur ; Shouichiro Iio, Auteur ; Kenji Kawashima, Auteur . - 2011 . - pp.400-409. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 6 (Juin 2011) . - pp.400-409 Mots-clés : Vortex  levitation  Vortex  gripper  Noncontact  handling,  Air-swirling  flow  Computational  fluid  dynamics  (CFD) Résumé : The vortex gripper is a recently developed pneumatic noncontact handling device that takes advantage of air-swirling flow to cause upward lifting force and that thereby can pick up and hold a work piece placed underneath without any contact. It is applicable where, e.g., in the semiconductor wafer manufacturing process, contact should be avoided during handling and moving in order to minimize damage to a work piece. For the purpose of a full understanding of the mechanism of the vortex gripper, a computational fluid dynamics (CFD) study was conducted in this paper, and at the same time, experimental work was carried out to measure the pressure distribution on the upper surface of the work piece. First, three turbulence models were used for simulation and verified by comparison with the experimental pressure distribution. It is known that the Reynolds stress transport model (RSTM) can reproduce the real distribution better. Then, on the basis of the experimental and numerical result of RSTM, an insight into the vortex gripper and its flow phenomena, including flow structure, spatial velocity, and pressure distributions, and an investigation into the influence of clearance variation was given. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i6/p400_s1?isAuthorized=no

Concentrating solar power development in China / Zhifeng Wang in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021203/1-8] Titre : Concentrating solar power development in China Type de document : texte imprimé Auteurs : Zhifeng Wang, Auteur ; Xin Li, Auteur ; Zhihao Yao, Auteur Année de publication : 2011 Article en page(s) : pp. [021203/1-8] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : China  Solar  thermal  power Index. décimale : 621.47 Résumé : Research on concentrating solar power (CSP) technologies began in 1979 in China. With pressure on environmental and energy resources, the CSP technology development has been accelerating since 2003. After 30 years of development, China has made significant progress on solar absorbing materials, solar thermal-electrical conversion materials, solar energy storage materials, solar concentrator equipments, evacuated tube solar trough collectors, solar thermal receivers, solar dish-Stirling systems, solar high-temperature air power generations, and solar power tower system designs. A 1 MW solar tower plant demonstration project landmark is currently being built in Beijing, to be completed by 2010 with a maximum temperature of 390°C and pressure of 2.35 MPa. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Concentrating solar power development in China [texte imprimé] / Zhifeng Wang, Auteur ; Xin Li, Auteur ; Zhihao Yao, Auteur . - 2011 . - pp. [021203/1-8]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021203/1-8] Mots-clés : China  Solar  thermal  power Index. décimale : 621.47 Résumé : Research on concentrating solar power (CSP) technologies began in 1979 in China. With pressure on environmental and energy resources, the CSP technology development has been accelerating since 2003. After 30 years of development, China has made significant progress on solar absorbing materials, solar thermal-electrical conversion materials, solar energy storage materials, solar concentrator equipments, evacuated tube solar trough collectors, solar thermal receivers, solar dish-Stirling systems, solar high-temperature air power generations, and solar power tower system designs. A 1 MW solar tower plant demonstration project landmark is currently being built in Beijing, to be completed by 2010 with a maximum temperature of 390°C and pressure of 2.35 MPa. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Enhanced visible - light photoelectrocatalytic degradation of organic contaminants at iodine - doped titanium dioxide film electrode / Dongting Wang in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 218-224 Titre : Enhanced visible - light photoelectrocatalytic degradation of organic contaminants at iodine - doped titanium dioxide film electrode Type de document : texte imprimé Auteurs : Dongting Wang, Auteur ; Xin Li, Auteur ; Jianfeng Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 218-224 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Electrodes  Pollution  Photocatalysis  Electrocatalysis  Visible  radiation Résumé : For the sake of effectively utilizing visible light of the solar spectrum in photoelectrocatalytic (PEC) degradation of organic contaminants, iodine-doped TiO2 nanocrystallites (I-TNCs) film electrodes with extended response to visible light and mesoporous nanocrystalline framework were fabricated and subsequently characterized by scanning electronic microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and diffuse reflectance spectrum (DRS). The PEC activity of the film electrodes was evaluated by the degradation of rhodamine B (RhB) and 1-naphthol (1-NP) in aqueous solution at ambient conditions under visible irradiation. Under an optimized I/Ti doping ratio of 2.5 mol %, the PEC performance of the film electrode based on I-TNCs is significantly better, with the RhB degradation efficiency of 92%, which was nearly 2-fold faster than that of the film electrode based on undoped TNCs. In comparison with photocatalytic (PC) process and electrochemical (EC) process, a significant synergetic effect was observed in the PEC degradation oforganic contaminants. The main degraded products of 1-NP were further analyzed by GC-MS and ca. 70% of TOC removal was obtained. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476464 [article] Enhanced visible - light photoelectrocatalytic degradation of organic contaminants at iodine - doped titanium dioxide film electrode [texte imprimé] / Dongting Wang, Auteur ; Xin Li, Auteur ; Jianfeng Chen, Auteur . - 2012 . - pp. 218-224. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 218-224 Mots-clés : Electrodes  Pollution  Photocatalysis  Electrocatalysis  Visible  radiation Résumé : For the sake of effectively utilizing visible light of the solar spectrum in photoelectrocatalytic (PEC) degradation of organic contaminants, iodine-doped TiO2 nanocrystallites (I-TNCs) film electrodes with extended response to visible light and mesoporous nanocrystalline framework were fabricated and subsequently characterized by scanning electronic microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and diffuse reflectance spectrum (DRS). The PEC activity of the film electrodes was evaluated by the degradation of rhodamine B (RhB) and 1-naphthol (1-NP) in aqueous solution at ambient conditions under visible irradiation. Under an optimized I/Ti doping ratio of 2.5 mol %, the PEC performance of the film electrode based on I-TNCs is significantly better, with the RhB degradation efficiency of 92%, which was nearly 2-fold faster than that of the film electrode based on undoped TNCs. In comparison with photocatalytic (PC) process and electrochemical (EC) process, a significant synergetic effect was observed in the PEC degradation oforganic contaminants. The main degraded products of 1-NP were further analyzed by GC-MS and ca. 70% of TOC removal was obtained. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476464

Ozonation of phenol with O3/Fe(II) in acidic environment in a rotating packed bed / Zequan Zeng in Industrial & engineering chemistry research, Vol.51 N° 31 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10509–10516 Titre : Ozonation of phenol with O3/Fe(II) in acidic environment in a rotating packed bed Type de document : texte imprimé Auteurs : Zequan Zeng, Auteur ; Haikui Zou, Auteur ; Xin Li, Auteur Année de publication : 2012 Article en page(s) : pp. 10509–10516 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ozonation  Phenol Résumé : The treatment of acidic phenolic wastewater by ferrous-catalyzed ozonation (O3/Fe(II)) process in a rotating packed bed (RPB) was studied, and the O3/Fe(II) process was compared with the O3 process. It was observed that the phenol degradation rate in the O3/Fe(II) process was roughly 10% higher than that of O3 process in acidic environment in the RPB. It is also found that the degradation efficiency of phenol was significantly affected by the rotation speed and inlet ozone concentration. Phenol degradation efficiency increased with increasing initial pH of the phenolic solution, rotation speed, and concentrations of the inlet ozone gas, as well as a decreasing liquid flow rate and initial concentrations of phenol. Phenol degradation efficiency reached maximum at a temperature of 25 °C and an initial Fe(II) concentration of 0.4 mM. The result of the contrast experiment showed that the biological oxygen demand/chemical oxygen demand (BOD/COD) of the phenol solution increased from 0.2 to 0.59 after the solution was treated by O3/Fe(II) process. The intermediates of the ferrous-catalyzed ozonation process were identified by gas chromatography/mass spectroscopy (GC/MS), and it is deduced that the pathway of phenol degradation in ferrous-catalyzed ozonation is different from that in ozonation. Hydroquinone and 1,4-benzoquinone were the main intermediates, and a small amount of polymeric intermediates was found in the O3/Fe(II) process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300476d [article] Ozonation of phenol with O3/Fe(II) in acidic environment in a rotating packed bed [texte imprimé] / Zequan Zeng, Auteur ; Haikui Zou, Auteur ; Xin Li, Auteur . - 2012 . - pp. 10509–10516. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10509–10516 Mots-clés : Ozonation  Phenol Résumé : The treatment of acidic phenolic wastewater by ferrous-catalyzed ozonation (O3/Fe(II)) process in a rotating packed bed (RPB) was studied, and the O3/Fe(II) process was compared with the O3 process. It was observed that the phenol degradation rate in the O3/Fe(II) process was roughly 10% higher than that of O3 process in acidic environment in the RPB. It is also found that the degradation efficiency of phenol was significantly affected by the rotation speed and inlet ozone concentration. Phenol degradation efficiency increased with increasing initial pH of the phenolic solution, rotation speed, and concentrations of the inlet ozone gas, as well as a decreasing liquid flow rate and initial concentrations of phenol. Phenol degradation efficiency reached maximum at a temperature of 25 °C and an initial Fe(II) concentration of 0.4 mM. The result of the contrast experiment showed that the biological oxygen demand/chemical oxygen demand (BOD/COD) of the phenol solution increased from 0.2 to 0.59 after the solution was treated by O3/Fe(II) process. The intermediates of the ferrous-catalyzed ozonation process were identified by gas chromatography/mass spectroscopy (GC/MS), and it is deduced that the pathway of phenol degradation in ferrous-catalyzed ozonation is different from that in ozonation. Hydroquinone and 1,4-benzoquinone were the main intermediates, and a small amount of polymeric intermediates was found in the O3/Fe(II) process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300476d

Silica-based 2-aminomethylpyridine functionalized adsorbent for hydrometallurgical extraction of low-grade copper ore / Xin Li in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15224–15232 Titre : Silica-based 2-aminomethylpyridine functionalized adsorbent for hydrometallurgical extraction of low-grade copper ore Type de document : texte imprimé Auteurs : Xin Li, Auteur ; Baohua Li, Auteur ; Shan Wu, Auteur Année de publication : 2013 Article en page(s) : pp. 15224–15232 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorbent  Hydrometallurgical Résumé : A silica-based 2-aminomethylpyridine functionalized adsorbent was synthesized to extract copper. Characterization of the adsorbent was carried out to determine the surface morphology, specific surface area, pore size, and grafting ratio of 2-aminomethylpyridine groups. The adsorption selectivity of the adsorbent for Cu(II) ions was 1353 times higher than that for Fe(III) ions. The adsorption capacity for Cu(II) ions maintained a stable value of 0.53 mmol/g with and without perturbation of Fe(III) ions. Density functional theory (DFT) calculations revealed a mechanism of selective adsorption of copper, through the formation of 2-aminomethylpyridine-Cu(II) complexes. Semi-industrial scale experiments revealed that Cu(II) ions in the acidic leachate of low-grade copper ore could be efficiently extracted by the adsorbent even in perturbation of substantial amounts of Fe(III) and other metal ions. Based on the adsorbent, a new process for copper hydrometallurgical extraction was developed, in which the adverse environmental impacts in traditional solvent extraction processes could be avoided. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301852r [article] Silica-based 2-aminomethylpyridine functionalized adsorbent for hydrometallurgical extraction of low-grade copper ore [texte imprimé] / Xin Li, Auteur ; Baohua Li, Auteur ; Shan Wu, Auteur . - 2013 . - pp. 15224–15232. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15224–15232 Mots-clés : Adsorbent  Hydrometallurgical Résumé : A silica-based 2-aminomethylpyridine functionalized adsorbent was synthesized to extract copper. Characterization of the adsorbent was carried out to determine the surface morphology, specific surface area, pore size, and grafting ratio of 2-aminomethylpyridine groups. The adsorption selectivity of the adsorbent for Cu(II) ions was 1353 times higher than that for Fe(III) ions. The adsorption capacity for Cu(II) ions maintained a stable value of 0.53 mmol/g with and without perturbation of Fe(III) ions. Density functional theory (DFT) calculations revealed a mechanism of selective adsorption of copper, through the formation of 2-aminomethylpyridine-Cu(II) complexes. Semi-industrial scale experiments revealed that Cu(II) ions in the acidic leachate of low-grade copper ore could be efficiently extracted by the adsorbent even in perturbation of substantial amounts of Fe(III) and other metal ions. Based on the adsorbent, a new process for copper hydrometallurgical extraction was developed, in which the adverse environmental impacts in traditional solvent extraction processes could be avoided. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301852r

The effect of surface properties in activated carbon on mercury adsorption / Liqing Li in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

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