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Promotion effects of alkali metals on iron molybdate catalysts for CO_(2)catalytic hydrogenation

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Journal of Energy Chemistry 2023年第10期85卷 291-300,I0009页

作者： Yong Zhou Aliou Sadia Traore deizi V.Peron Alan J.Barrios Sergei A.Chernyak Massimo Corda Olga V.Safonova Achim Iulian Dugulan Ovidiu Ersen Mirella Virginie Vitaly V.Ordomsky Andrei Y.Khodakov university of lille CNRSCentrale LilleUniversity of ArtoisUMR 8181-UCCS-Unitéde Catalyse et Chimie du SolideLille F-59000France IPCMS UMR 7504 CNRSUniversitéde Strasbourg23 rue du LoessBP 43Cedex 267034 StrasbourgFrance PSI CH-5232 VilligenSwitzerland Fundamental Aspects of Materials and Energy Group Delft University of TechnologyMekelweg 15Delft 2629 JBNetherlands

CO_(2)hydrogenation is an attractive way to store and utilize carbon dioxide generated by industrial processes,as well as to produce valuable chemicals from renewable and abundant *** catalysts are commonly used for the hydrogenation of carbon oxides to ***-molybdenum catalysts have found numerous applications in catalysis,but have been never evaluated in the CO_(2)*** this work,the structural properties of iron-molybdenum catalysts without and with a promoting alkali metal(Li,Na,K,Rb,or Cs)were characterized using X-ray diffraction,hydrogen temperatureprogrammed reduction,CO_(2)temperature-programmed desorption,in-situ^(57)Fe Mossbauer spectroscopy and operando X-ray adsorption *** catalytic performance was evaluated in the CO_(2)*** the reaction conditions,the catalysts undergo the formation of an iron(Ⅱ)molybdate structure,accompanied by a partial reduction of molybdenum and carbidization of *** rate of CO_(2)conversion and product selectivity strongly depend on the promoting alkali metals,and electronegativity was identified as an important factor affecting the catalytic *** CO_(2)conversion rates were observed with the promoters having higher electronegativity,while low electronegativity of alkali metals favors higher light olefin selectivity.

关键词： CO_(2)utilization Iron molybdate catalysts Promotion Alkali metals Light olefins In-situ characterization

Atmospheric and kinetic studies of OH and HO_2 by the FAGE technique

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Journal of Environmental Sciences 2012年第1期24卷 78-86页

作者： D.Amedro K.Miyazaki A.Parker C.Schoemaecker C.Fittschen Laboratoire PC2A Universit de Lille 1- Ba timent C1159655 Villeneuve d'AscqFrance department of Applied Chemistry Tokyo Metropolitan UniversityJapan

A new FAGE setup has recently been built at the university of lille,*** permits the quantification of OH and HO 2 in the atmosphere with a detection limit of 3×10 5 molecules/（cm 3 ·min） for OH and 1×10 6 molecules/（cm 3 ·min） for HO *** coupling to a photolysis cell enables the measurement of the total reactivity of the hydroxyl radical in ambient air and kinetic studies in *** configurations have been considered：one with the photolysis cell at 90° to the FAGE nozzle,the other on line with the FAGE *** two configurations have been tested and validated by measuring the well known rate constants of OH with CH 4,C 3 H 8 and *** advantages and drawbacks of each configuration have been *** ＂on line＂ configuration limits losses and permits measurements over a larger reactivity range but is affected by OH formation from the laser beam striking the FAGE nozzle,thus limiting the ability to carry out energy dependence studies which can,in contrast,be successfully performed in the 90° configuration.

关键词： OH kinetic reactivity laser induced fluorescence

Does gastric atrophy exist in children?

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World Journal of Gastroenterology 2006年第39期12卷 6274-6279页

作者： Georges Dimitrov Frédéric Gottrand Gastroenterology hepatology and nutrition Unit Clinic of Pediatrics H?pital J de Flandre CHRU de Lille et Faculté de Médecine Université de Lille 2 Lille France

Several clinical reports confirmed that gastric atrophy is a pathology not only limited to adult patients. In pediatrics, it is most olden described in association with a H pylori infection but this bacteria does not seem to be the only etiological factor of this preneoplastic state in children. The frequency of gastric atrophy and intestinal metaplasia in children are unknown because they are not systematically sought during upper gastrointestinal endoscopy. The lack of specific histological classification of children＇s gastropathies makes their diagnosis difficult for pathologists. Based on our knowledge to date, we think that it is necessary to describe, in detail, the natural course of this lesion during childhood. A close and prolonged clinical and endoscopic follow-up is important for children with gastric atrophy.

关键词： Gastric atrophy Gastritis H pylori Intestinal metaplasia Gastric cancer Children

UWB System Based on the Modified Gegenbauer Function in MISO Channel

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Wireless Engineering and Technology 2013年第2期4卷 117-123页

作者： A. Okassa M’foubat C. Tatkeu F. Elbahhar université lille Nord de France Lille France

In this paper, we propose a new multi-user Rake receiver, based on the interference mutualization with a matrix representation for Multiple Input Single Output MISO channel. The proposed system used the Modified Gegenbauer functions in order to generate the signal and to ensure the multi users transmission system. The new proposed receiver allows, using the temporal and special diversity, to avoid the interferences between symbols and to improve the system performances in terms of Bit Error Rate BER and interferences between users with a low algorithm complexity. The proposed solution is based on the classical Rake receiver associated with the equalizer receiver. In order to adapt the Rake approach, in single detection case and in multi users Ultra Wide Band environment, we propose a multi-user Rake receiver using the matrix form. Our proposed system is evaluated in terms of channel effects and multi users’ interferences.

关键词： UWB MISO Channel Rake Receiver LMMSE Modified Gegenbauer Function

Blockage and distortion effects on a vane-island type diffuser performance of centrifugal pumps for various flow rates

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排灌机械工程学报 2016年第12期34卷 1013-1021页

作者： SI Qiaorui DAZIN Antoine DUPONT Patrick ROUSSETTE Olivier BOIS Gérard National Research Center of Pumps Jiangsu University Laboratoire de Mécanique de lille (UMR CNRS 8107) Arts et Métiers ParisTech Laboratoire de Mécanique de lille(UMR CNRS 8107) Ecole Centrale de Lille

Experimental investigation of mean flow velocity and pressure inside the vane-island type diffuser passage of a test centrifugal pump model is presented.A directional three-hole probe was used to investigate hub-to-shroud flow properties at diffuser leading and trailing edge *** addition,the mid-section between suction and pressure sides along the diffuser passage was also *** these measurements were performed at five different flow *** flow structures at the inlet section of the diffuser and along with the passage were analyzed in detail,with a focus on the flow distribution and the pressure recovery evolution of different diffuser *** and distortion effects were analyzed by using existing published particle image velocimetry(PIV)measurements in the outer part of the impeller and around the diffuser throat in order to get a better understanding of the overall performances and local flow structures of such a diffuser *** results show that back flows occur on the shroud region from impeller exit plane up to the semi-vaneless part of the diffuser at low flow *** blockage effects combining with blade thickness geometrical blockage tend to diminish the effects of theoretical high positive *** high flow rates,negative incidence effects induce high local velocity on the pressure side of the diffuser just after the *** aerodynamic blockage associated with low flow distortions are found to have a beneficial effect on pressure recovery for low flow *** the contrary,high flow distortions are found for increased flow rates,resulting in a low pressure recovery inside the semi-vane less part of the diffuser and after the throat.

关键词： vane island diffuser flow structure pressure recovery three-hole probe particle image velocimetry

Probiotic yeasts: Anti-inflammatory potential of various non-pathogenic strains in experimental colitis in mice

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World Journal of Gastroenterology 2010年第17期16卷 2134-2145页

作者： Benot Foligné Jo■lle dewulf Pascal Vandekerckove Georges Pignède Bruno Pot Institut Pasteur of lille Lactic acid Bacteria & Mucosal ImmunityCenter for Infection and Immunity of Lille1 rue du Pr CalmetteBP 245F-59019 LilleFrance university of lille Nord de France F-59000 LilleFrance Centre National de la Recherche Scientifique UMR 8204F-59021 LilleFrance Institut National de la Santé et de la Recherche Médicale U1019F-59019 LilleFrance Lesaffre International Direction of Research and Developpement147 rue Gabriel PériBP 602759700 Marcq-en-BaroeulFrance

AIM: To evaluate the in vitro immunomodulation capacity of various non-pathogenic yeast strains and to investigate the ability of some of these food grade yeasts to prevent experimental colitis in ***: In vitro immunomodulation was assessed by measuring cytokines [interleukin (IL)-12p70,IL-10,tumor necrosis factor and interferon γ] released by human peripheral blood mononuclear cells after 24 h stimulation with 6 live yeast strains (Saccharomyces ssp.) and with bacterial reference strains.A murine model of acute 2-4-6-trinitrobenzene sulfonic acid (TNBS)-colitis was next used to evaluate the distinct prophylactic protective capacities of three yeast strains compared with the performance of prednisolone ***: The six yeast strains all showed similar non-discriminating anti-inflammatory potential when tested on immunocompetent cells in vitro .However,although they exhibited similar colonization patterns in vivo ,some yeast strains showed significant anti-inflammatory activities in the TNBS-induced colitis model,whereas others had weaker or no preventive effect at all,as evidenced by colitis markers (body-weight loss,macroscopic and histological scores,myeloperoxidase activities and blood inflammatory markers).CONCLUSION: A careful selection of strains is required among the biodiversity of yeasts for specific clinical studies,including applications in inflammatory bowel disease and other therapeutic uses.

关键词： Yeast Probiotics Strain specificity Experimental colitis 2-4-6-trinitrobenzene sulfonic acid

Oxidative dehydrogenation of propane under steady-state and transient regimes over alumina-supported catalysts prepared from mixed V_2W_4O_(19)^(4-) hexametalate precursors

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Journal of Natural Gas Chemistry 2010年第2期19卷 123-133页

作者： Sébastien Paul Elise Berrier Marcia Cristina Kaezer Frana Jean-Guillaume Eon Univ lille Nord de France F-59000 LilleFrance EClille UCCSF-59650 Villeneuve d'AscqFrance CNRS UMR 8181F-59650 Villeneuve d'AscqFrance USTL UCCSF-59650 Villeneuve d'AscqFrance Instituto de Quimíca Universidade Federal do Rio de Janeiro-Cidade UniversitáriaIlha do Fundo21945-970 Rio de JaneiroBrazil

An integrated approach combining the development of an innovative catalyst and the research of a set of adequate operating conditions for the propane oxidative dehydrogenation （ODH） is *** experimental set-up,specially designed for steady-state and transient studies is *** preparation method,the characterization and the performances in steady-state and transient regimes of catalysts based on V2W4O194-Lindqvist isopolyanion used as a precursor and supported on alumina are *** influence of the preparation method of the catalyst and the role of water in the feed gas are more particularly discussed.

关键词： propane oxidative dehydrogenation (ODH) transient regime pulsed reactor Lindqvist isopolyanion in-situ Raman

OLD AND RECENT RESULTS IN THE ANALYTIC THEORY OF DIRICHLET SERIES:A SURVEY

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Acta Mathematica Scientia 2021年第6期41卷 2107-2122页

作者： Hervé QUEFFéLEC université des Sciienes et Technologies de lille Laboratoire Paul Painlevé U.M.R.CNRS 8524 U.F.R.de Mathématiques59655VILLENEUVE D’ASCQ CedexFrance

This survey is dedicated to the memory of Professor Jiarong Yu,who recently passed *** is concerned by a topic of which he was fond,an interest shared by myself:the analytic theory of Dirichlet series.

关键词： Dirichlet series analytic theory

Atmospheric Correction of SeaWiFS Data for the Retrieval of SuspendedSediment in East China Coastal Waters

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China Ocean Engineering 2005年第2期19卷 225-234页

作者：廖迎娣张玮 P.Y.deschamps College of Ocean Hohai University Nanjing 210098 China Laboratoire d'Optique Atmosphérique UMR CNRS 8518 Université de Lille I 59655 Villeneuve d'Ascq France

The data of SeaWiFS (Sea-Viewing Wide Field-of-View Sensor), installed on SeaStar, has been used to generate SSC (suspended sediment concentration) of complex and turbid coastal waters in China. In view of the problems of the SeaDAS (SeaWiFS Data Analysis System) algorithm applied to China coastal waters, a new atmospheric correction algorithm is discussed, developed, and used for the SSC of East China coastal waters. The advantages of the new algorithm are described through the comparison of the results from different algorithms.

关键词： suspended sediment concentration Sea-Viewing Wide Field-of-View Sensor suspended sediment atmospheric correction China coastal waters