Documents disponibles écrits par cet auteur

Catalytic effect of transition metal doped in the Li - N - H system for hydrogen storage / Qiang Wang in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 5993-5996 Titre : Catalytic effect of transition metal doped in the Li - N - H system for hydrogen storage : A first principle investigation Type de document : texte imprimé Auteurs : Qiang Wang, Auteur ; Zhiqian Chen, Auteur ; Yu, Wenbin, Auteur Année de publication : 2010 Article en page(s) : pp. 5993-5996 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Storage  Catalytic  reaction Résumé : The ternary Li—M—N—H systems, in which one of the Li sites in LiNH2 was substituted by transition metals (Ti, Cr, Fe, or Ni), were calculated with a first principle to explore new ternary systems for hydrogen storage. In order to evaluate their properties of hydrogen storage, the electronic structures, N—H chemical bonds, and thermodynamics of these systems were extensively computed and analyzed. In contrast to the Li—N—H system, these results proved a favorable energy cost to break the N-H bond and dissociate the H atom from these ternary amides. Of particular interest, there was a significant improvement in thermodynamics of the Li-Ti-N-H system, which had a reaction enthalpy of -46.6 kJ/mol compared with that of -75.67 kJ/mol in the Li—N—H system. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22974415 [article] Catalytic effect of transition metal doped in the Li - N - H system for hydrogen storage : A first principle investigation [texte imprimé] / Qiang Wang, Auteur ; Zhiqian Chen, Auteur ; Yu, Wenbin, Auteur . - 2010 . - pp. 5993-5996. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 5993-5996 Mots-clés : Storage  Catalytic  reaction Résumé : The ternary Li—M—N—H systems, in which one of the Li sites in LiNH2 was substituted by transition metals (Ti, Cr, Fe, or Ni), were calculated with a first principle to explore new ternary systems for hydrogen storage. In order to evaluate their properties of hydrogen storage, the electronic structures, N—H chemical bonds, and thermodynamics of these systems were extensively computed and analyzed. In contrast to the Li—N—H system, these results proved a favorable energy cost to break the N-H bond and dissociate the H atom from these ternary amides. Of particular interest, there was a significant improvement in thermodynamics of the Li-Ti-N-H system, which had a reaction enthalpy of -46.6 kJ/mol compared with that of -75.67 kJ/mol in the Li—N—H system. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22974415

Context-based entropy coding in AVS video coding standard / Zhang, Li. in Signal processing. Image communication, Vol. 24 N° 4 (Avril 2009) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 24 N° 4 (Avril 2009) . - pp. 263-276 Titre : Context-based entropy coding in AVS video coding standard Type de document : texte imprimé Auteurs : Zhang, Li., Auteur ; Qiang Wang, Auteur ; Ning Zhang, Auteur Article en page(s) : pp. 263-276 Note générale : Electronique Langues : Anglais (eng) Mots-clés : AVS  DCT  video  coding  Entropy  coding  Context  modeling  Variable  length  coding  Arithmetic  coding Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs Résumé : In this paper, two context-based entropy coding schemes for AVS Part-2 video coding standard are presented. One is Context-based 2D Variable Length Coding (C2DVLC) as a low complexity entropy coding scheme for AVS Part-2 Jizhun profile. C2DVLC uses multiple 2D-VLC tables to exploit the statistical features of DCT coefficients for higher coding efficiency. Exponential–Golomb codes are applied in C2DVLC to code the pairs of the run-length of zero coefficients and the non-zero coefficients for lower storage requirement. The other is Context-based Binary Arithmetic Coding (CBAC) as an enhanced entropy coding scheme for AVS Part-2 Jiaqiang profile. CBAC utilizes all previously coded coefficient magnitudes in a DCT block for context modeling. This enables adaptive arithmetic coding to exploit the redundancy of the high-order Markov process in DCT domain with a few contexts. In addition, a context weighting technique is used to further improve CBAC's coding efficiency. Moreover, CBAC is designed to be compatible to C2DVLC in coding elements which simplifies the implementations. The experimental results demonstrate that both C2DVLC and CBAC can achieve comparable or even slightly higher coding performance when compared to Context-Adaptive Variable Length Coding (CAVLC) in H.264/AVC baseline profile and Context-Based Adaptive Binary Arithmetic Coding (CABAC) in H.264/AVC main profile respectively. DEWEY : 361.382 ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...] [article] Context-based entropy coding in AVS video coding standard [texte imprimé] / Zhang, Li., Auteur ; Qiang Wang, Auteur ; Ning Zhang, Auteur . - pp. 263-276. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 24 N° 4 (Avril 2009) . - pp. 263-276 Mots-clés : AVS  DCT  video  coding  Entropy  coding  Context  modeling  Variable  length  coding  Arithmetic  coding Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs Résumé : In this paper, two context-based entropy coding schemes for AVS Part-2 video coding standard are presented. One is Context-based 2D Variable Length Coding (C2DVLC) as a low complexity entropy coding scheme for AVS Part-2 Jizhun profile. C2DVLC uses multiple 2D-VLC tables to exploit the statistical features of DCT coefficients for higher coding efficiency. Exponential–Golomb codes are applied in C2DVLC to code the pairs of the run-length of zero coefficients and the non-zero coefficients for lower storage requirement. The other is Context-based Binary Arithmetic Coding (CBAC) as an enhanced entropy coding scheme for AVS Part-2 Jiaqiang profile. CBAC utilizes all previously coded coefficient magnitudes in a DCT block for context modeling. This enables adaptive arithmetic coding to exploit the redundancy of the high-order Markov process in DCT domain with a few contexts. In addition, a context weighting technique is used to further improve CBAC's coding efficiency. Moreover, CBAC is designed to be compatible to C2DVLC in coding elements which simplifies the implementations. The experimental results demonstrate that both C2DVLC and CBAC can achieve comparable or even slightly higher coding performance when compared to Context-Adaptive Variable Length Coding (CAVLC) in H.264/AVC baseline profile and Context-Based Adaptive Binary Arithmetic Coding (CABAC) in H.264/AVC main profile respectively. DEWEY : 361.382 ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

Crystallization behavior of reactive blends between PBS and PA6IcoT / Kun Cao in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5461-5468 Titre : Crystallization behavior of reactive blends between PBS and PA6IcoT Type de document : texte imprimé Auteurs : Kun Cao, Auteur ; Qiang Wang, Auteur ; Ya-chan Zhou, Auteur Année de publication : 2012 Article en page(s) : pp. 5461-5468 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Crystallization Résumé : A biodegradable crystalline aliphatic polyester, poly(butylene succinate) (PBS), and an amorphous semiaromatic nylon, poly(hexamethylene isophthalamide-co-terephthalamide) (PA6IcoT), were melted and reactively blended with p-toluene sulfonic acid as the catalyst. The isothermal and nonisothermal crystallization processes of PBS and its blends with PA6IcoT were investigated by differential scanning calorimetry (DSC). Three different models (Jeziorny’s, Ozawa’s, and Mo et al.’s methods) were used to simulate the isothermal and nonisothermal crystallization kinetics. Moreover, the crystalline morphologies were observed by polarized optical microscopy. The effects of PA6IcoT and the ester–amide exchange reaction between polyester and polyamide on the crystallization processes and crystalline morphology are described in detail. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815824 [article] Crystallization behavior of reactive blends between PBS and PA6IcoT [texte imprimé] / Kun Cao, Auteur ; Qiang Wang, Auteur ; Ya-chan Zhou, Auteur . - 2012 . - pp. 5461-5468. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5461-5468 Mots-clés : Crystallization Résumé : A biodegradable crystalline aliphatic polyester, poly(butylene succinate) (PBS), and an amorphous semiaromatic nylon, poly(hexamethylene isophthalamide-co-terephthalamide) (PA6IcoT), were melted and reactively blended with p-toluene sulfonic acid as the catalyst. The isothermal and nonisothermal crystallization processes of PBS and its blends with PA6IcoT were investigated by differential scanning calorimetry (DSC). Three different models (Jeziorny’s, Ozawa’s, and Mo et al.’s methods) were used to simulate the isothermal and nonisothermal crystallization kinetics. Moreover, the crystalline morphologies were observed by polarized optical microscopy. The effects of PA6IcoT and the ester–amide exchange reaction between polyester and polyamide on the crystallization processes and crystalline morphology are described in detail. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815824

Determination of the solubility parameter of ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate by inverse gas chromatography / Yali Chen 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. 15293–15298 Titre : Determination of the solubility parameter of ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate by inverse gas chromatography Type de document : texte imprimé Auteurs : Yali Chen, Auteur ; Qiang Wang, Auteur ; Zhengfang Zhang, Auteur Année de publication : 2013 Article en page(s) : pp. 15293–15298 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  chromatography  Ionic  liquid  Solubility Résumé : In this study, physical and thermodynamic properties of 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM]PF6) were investigated by using inverse gas chromatography (IGC). Two groups of solvents with different chemical natures and polarities were used to obtain information about [HMIM]PF6-solvent interactions: chloroform, ethyl acetate, ether, acetone and alkanes. The specific retention volume (Vg0), molar heat of sorption, weight fraction activity coefficient, activity coefficients at infinite dilution, partial molar heat of mixing and Flory–Huggins interaction parameter between [HMIM]PF6 and solvents were determined in the temperature range of 343.15–373.15 K. Also, the solubility parameters of [HMIM]PF6 at infinite dilution were found by plotting the graph of δ12/(RT) – χ1.2∞/V1 versus solubility parameters, δ1, of probes. The results showed that n-C6, n-C7, n-C8, n-C9, ether, and n-butyl alcohol were poor solvents for [HMIM]PF6; chloroform, acetone, and ethyl acetate were favorite ones, while ethanol was moderate solvent for [HMIM]PF6 (close to poor solvent). The solubility parameter of [HMIM]PF6 was determined as 23.28 (J/cm3)0.5 by the extrapolation at 298.15 K. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679650 [article] Determination of the solubility parameter of ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate by inverse gas chromatography [texte imprimé] / Yali Chen, Auteur ; Qiang Wang, Auteur ; Zhengfang Zhang, Auteur . - 2013 . - pp. 15293–15298. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15293–15298 Mots-clés : Gas  chromatography  Ionic  liquid  Solubility Résumé : In this study, physical and thermodynamic properties of 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM]PF6) were investigated by using inverse gas chromatography (IGC). Two groups of solvents with different chemical natures and polarities were used to obtain information about [HMIM]PF6-solvent interactions: chloroform, ethyl acetate, ether, acetone and alkanes. The specific retention volume (Vg0), molar heat of sorption, weight fraction activity coefficient, activity coefficients at infinite dilution, partial molar heat of mixing and Flory–Huggins interaction parameter between [HMIM]PF6 and solvents were determined in the temperature range of 343.15–373.15 K. Also, the solubility parameters of [HMIM]PF6 at infinite dilution were found by plotting the graph of δ12/(RT) – χ1.2∞/V1 versus solubility parameters, δ1, of probes. The results showed that n-C6, n-C7, n-C8, n-C9, ether, and n-butyl alcohol were poor solvents for [HMIM]PF6; chloroform, acetone, and ethyl acetate were favorite ones, while ethanol was moderate solvent for [HMIM]PF6 (close to poor solvent). The solubility parameter of [HMIM]PF6 was determined as 23.28 (J/cm3)0.5 by the extrapolation at 298.15 K. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679650

Hydrogen storage in perovskite - type oxides ABO3 for Ni / MH battery applications / Qiang Wang 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. 11821–11827 Titre : Hydrogen storage in perovskite - type oxides ABO3 for Ni / MH battery applications : A density functional investigation Type de document : texte imprimé Auteurs : Qiang Wang, Auteur ; Zhiqian Chen, Auteur ; Yungui Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 11821–11827 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrogen  Oxides Résumé : Perovskite oxides were typically considered as the electronic and ionic conductors for application in the electrolytes for solid oxides fuel cells (SOFCs). Recently, LaFeO3-based systems were mainly focused on the electrochemical property for the anode of Ni/MH batteries in our previous work, and the exciting results of their electrochemistry capacity and cycle life examination exhibited much scientific values for further investigation. In the present work, the effects of A (La)-site or B (Fe)-site metal ions doped and substituted on the fundamental properties of these materials were calculated by a first-principle approach. In conjunction with the experimental results, the microscopic mechanisms of the doped or substituted effect were discussed and elucidated. On the other hand, the hydrides of LaFe(Cr)O3 were established and computed to explore the nature of electrochemical behaviors of these perovskite oxides. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202284z [article] Hydrogen storage in perovskite - type oxides ABO3 for Ni / MH battery applications : A density functional investigation [texte imprimé] / Qiang Wang, Auteur ; Zhiqian Chen, Auteur ; Yungui Chen, Auteur . - 2012 . - pp. 11821–11827. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11821–11827 Mots-clés : Hydrogen  Oxides Résumé : Perovskite oxides were typically considered as the electronic and ionic conductors for application in the electrolytes for solid oxides fuel cells (SOFCs). Recently, LaFeO3-based systems were mainly focused on the electrochemical property for the anode of Ni/MH batteries in our previous work, and the exciting results of their electrochemistry capacity and cycle life examination exhibited much scientific values for further investigation. In the present work, the effects of A (La)-site or B (Fe)-site metal ions doped and substituted on the fundamental properties of these materials were calculated by a first-principle approach. In conjunction with the experimental results, the microscopic mechanisms of the doped or substituted effect were discussed and elucidated. On the other hand, the hydrides of LaFe(Cr)O3 were established and computed to explore the nature of electrochemical behaviors of these perovskite oxides. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202284z

Nature of Ti species in the Li-Mg-N-H system for hydrogen storage / Qiang Wang in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

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Predicting the toxicity of ionic liquids in leukemia rat cell line by the quantitative structure–activity relationship method using topological indexes / Fangyou Yan in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

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Preparation of high pore volume pseudoboehmite doped with transition metal ions through direct precipitation method / Fan Yang in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

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Promoted soot oxidation by doped K2Ti2O5 catalysts and NO oxidation catalysts / Qiang Wang in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

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Study on ester - amide exchange reaction between PBS and PA6lcoT / Zhen Yao in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

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Sulfur poisoning and regeneration of NOx storage − reduction Cu/K2Ti2O5 catalyst / Qiang Wang in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

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