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Synthesis, Surface Characterization and Photocatalytic Activity of TiO_2 Supported on Almond Shell Activated Carbon

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journal of Materials Science & Technology 2014年第9期30卷 894-902页

作者： A.Omri S.D.lambert j.Geens f.Bennour M.Benzina Laboratory of Water-Energy-Environment (LR35 Code: AD-10-02 National School of Engineers of SfaxUniversity of SfaxBP W 3038 Sfax Tunisia Laboratory of Chemical Engineering B6a University of LiègeB-4000 Liège Belgium Tunisian Chemical Group Sfax -Tunisia B.P 393/3018 Tunisia

Three types of photocatalysts were synthesized by metal organic chemical vapor deposition and impregnation methods using the almond shell activated carbon as support. These photocatalysts denoted by （TiO2/ASAC （V）, TiO2/ASAC （11） and TiO2/ASAC （12）） were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, fourier transform infrared spectroscopy （fTIR）, diffuse reflectance spectroscopy （DRS） and nitrogen adsorption-desorption isotherms. SEM observation shows that TiO2 was deposited on activated carbon surface. XRD results confirm that TiO2 existed in a mixture of anatase and rutile phases. The DRS spectra show the characteristic absorption edge of TiO2 at approximate 380 nm corresponding to the optical band gap of 3.26 eV. Besides, fTIR spectrum indicated the presence of （Ti-O） groups. The specific surface area of photocatalysts decreased drastically in comparison with the original activated carbon. The catalysts were very efficient for the photodegradation of total organic carbon （TOC） from industrial phosphoric acid solution under UV irradiation. The kinetics of photocatalytic TOC degradation was found to follow a pseudo- first-order model. The prepared TiO2/ASAC showed high photoactivity for the photodegradation of TOC in the following order： TiO2/ASAC （V）〉 TiO2/ASAC （11）〉 TiO2/ASAC （12）〉 ASAC 〉 TiO2 （P25）.

关键词： Almond shell activated carbon Photocatalyst Vapor deposition Impregnation Total organic carbon

Visualising the heart of chaos

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Light(Science & Applications) 2021年第12期10卷 2256-2257页

作者： Nicholas j.lambert Harald G.L.Schwefel Department of Physics University of OtagoDunedinNew Zealand The Dodd-Walls Centre for Photonic and Quantum Technologies DunedinNew Zealand

The intra-cavity electro-magnetic field distribution in a microdisk resonator can be visualised by inducing a phase shift via a scanning probe beam.

关键词： resonator chaos Visual

Tidal triggering of seismicity in the region of Palu, Central Sulawesi, Indonesia

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Geodesy and Geodynamics 2023年第4期14卷 377-384页

作者： Ibnu Nurul Huda Sebastien lambert jean Souchay Research Center for Computing National Research and Innovation AgencyBogorIndonesia Department of Astronomy and Bosscha Observatory FMIPAInstitut Teknologi BandungBandungIndonesia SYRTE Observatoire de ParisUniversité PSLCNRSSorbonne UniversitéLNEParisFrance

This paper investigates the correlation between tidal stress and earthquakes for periods ranging from hours to months in the limited zone of the Palu region(Central Sulawesi,Indonesia).Through Schuster and binomial tests,we examined the relation between the seismicity(time density of seismic events)and tidal potential arising from the Moon and Sun,using all tidal components simultaneously and focusing on the estimation of specific *** results show significant correlations between the seismicity and tidal potential for S2(0.5 d)and O1(1.075 d)tidal components in the case of solely isolated earthquake events,particularly for shallow ***,there is a strong relationship between aftershocks and tidal components larger than the Mf period(13.661 d).finally,the analysis of the temporal variation of the earthquake-tide relation reveals an optimal correlation for about six years before the 2018 great Palu *** correlation becomes insignificant afterwards.

关键词： Tidal triggering Earth tides Palu region Statistical test

甘氨酸在无机氧化物表面吸附与热聚合机理研究

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石油化工 2004年第Z1期33卷 1692-1694页

作者：孟明 L Stievano j f lambert 天津大学化工学院催化科学与工程系 Laboratoire de Réactivitéde Surface UMR CNRS 7609 Université Pierre et Marie Curie case courrier 1784 place Jussieu75252 Paris Cedex 05France Laboratoire de Réactivitéde Surface UMR CNRS 7609 Université Pierre et Marie Curie case courrier 1784 place Jussieu75252 Paris Cedex 05France Laboratoire de Réactivitéde Surface UMR CNRS 7609 Université Pierre et Marie Curie case courrier 1784 place Jussieu75252 Paris Cedex 05France

采用DTG、XRD、fTIR和in-situ DRIfT等手段对甘氨酸在SiO2和Al2O3表面的吸附和热聚合行为进行了研究.结果表明,在SiO2表面呈多层吸附,吸附量大,其聚合产物为环状二聚体DKP,SiO2对甘氨酸的吸附活化主要是通过表面≡Si-O-基团;而在Al2O3... 详细信息

采用DTG、XRD、fTIR和in-situ DRIfT等手段对甘氨酸在SiO2和Al2O3表面的吸附和热聚合行为进行了研究.结果表明,在SiO2表面呈多层吸附,吸附量大,其聚合产物为环状二聚体DKP,SiO2对甘氨酸的吸附活化主要是通过表面≡Si-O-基团;而在Al2O3表面的吸附符合Langmuir吸附模型,吸附量小,吸附位主要是表面Lewis酸位(Al3+)和碱位(O2-),聚合产物为线式二聚体,高温下转化为环状二聚体DKP.

关键词：甘氨酸 SiO2 Al2O3 吸附聚合机理

The Relationship between Model Biases in East Asian Summer Monsoon Rainfall and Land Evaporation

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Advances in Atmospheric Sciences 2023年第11期40卷 2029-2042,I0004-I0013页

作者： Ruth GEEN Marianne PIETSCHNIG Shubhi AGRAWAL Dipanjan DEY fHugo lambert Geoffrey KVALLIS School of Geography Earth and Environmental SciencesUniversity of BirminghamBirmingham B152TTUK Department of Mathematics and Statistics University of ExeterExeter EX44QJUK Department of Earth and Environmental Sciences Indian Institute of Science Education and ResearchBhopal 462066India School of Ocean and Earth Science University of SouthamptonSouthampton SO171BJUK

The East Asian Summer Monsoon(EASM)provides the majority of annual rainfall to countries in East *** state-of-the-art models broadly project increased EASM rainfall,the spread of projections is large and simulations of present-day rainfall show significant climatological *** evapotranspiration biases occur locally over East Asia,and globally over land,in simulations both with and without a coupled *** study explores the relationship between evapotranspiration and EASM precipitation ***,idealized model simulations are presented in which the parameterization of land evaporation is modified,while sea surface temperature is *** results suggest a feedback whereby excessive evapotranspiration over East Asia results in cooling of land,a weakened monsoon low,and a shift of rainfall from the Philippine Sea to China,further fueling ***-model regressions against evapotranspiration over China indicate a similar pattern of behavior in Atmospheric Model Intercomparison Project(AMIP)*** causes of this pattern are *** feedback is not explained by an overly intense global hydrological cycle or by differences in radiative *** of land-only simulations indicates that evapotranspiration biases are present even when models are forced with prescribed *** are strengthened when coupled to the atmosphere,suggesting a role for land-model errors in driving atmospheric *** atmosphere-ocean models are shown to have similar evapotranspiration biases to those in AMIP over China,but different precipitation biases,including a northward shift in the ITCZ over the Pacific and Atlantic Oceans.

关键词： monsoon East Asia China evapotranspiration model bias

Investigation on the influence of the initial RDX crystal size on the performance of shaped charge warheads

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Defence Technology（防务技术） 2019年第5期15卷 802-807页

作者： f.Majiet f.j.Mostert Rheinmetall Denel Munition Somerset WestSouth Africa Centre for Scientific&Industrial Research PretoriaSouth Africa

Copper lined wave shaped shaped charges of particular design and liner metallurgy were used to investigate the effect of explosive crystal size on the resultant shaped charge jet *** A3 with RDX of three different average crystal sizes,i.e.30μm,100μm and 300μm were used in the *** other parameters in the charge were kept constant and in particular,care was given to obtain consistent dimensional quality and liner microstructure,in order to prohibit the variation of other *** flash-X-ray diagnostics were used in field tests to obtain the jet parameters from multiple firings of similar *** is found that the varying crystal size of the RDX has a marginal influence in the total jet length of the ***,it is also found that there is less variation between firings in the jet parameters for jets from the charges loaded with the crystal size of 100 μm.

关键词： shaped size crystal

Implementation of a Roughness Element to Trip Transition in Large-eddy Simulation

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journal of Thermal Science 2015年第1期24卷 30-36页

作者： j.Boudet j.-f.Monier f.Gao LMfA Ecole Centrale de Lyon Université de Lyon–UMR CNRS 5509 69134 Ecully Cedex France PhD.Candidate Université de Lyon–UMR CNRS 5509 69134 Ecully Cedex France

In aerodynamics, the laminar or turbulent regime of a boundary layer has a strong influence on friction or heat transfer. In practical applications, it is sometimes necessary to trip the transition to turbulent, and a common way is by use of a roughness element （e.g. a step） on the wall. The present paper is concerned with the numerical im- plementation of such a trip in large-eddy simulations. The study is carried out on a flat-plate boundary layer con- figuration, with Reynolds number Rex=l.3x 106. first, this work brings the opportunity to introduce a practical methodology to assess convergence in large-eddy simulations. Second, concerning the trip implementation, a volume source term is proposed and is shown to yield a smoother and faster transition than a grid step. Moreover, it is easier to implement and more adaptable. finally, two subgrid-scale models are tested： the WALE model of Nic0ud and Ducros （flow Turbul. Combust., vol. 62, 1999） and the shear-improved Smagorinsky model of Ldv^que et al. （j. fluid Mech., vol. 570, 2007）. Both models allow transition, but the former appears to yield a faster transition and a better prediction of friction in the turbulent regime.

关键词： large-eddy simulation boundary layer roughness element transition tripping

Digestive retention times for Allen’s swamp monkey and L’Hoest’s monkey: data with implications for the evolution of cercopithecine digestive strategy

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Integrative Zoology 2012年第2期7卷 183-191页

作者： Kevin P.BLAINE joanna E.lambert Department of Anesthesia Stanford University Medical CenterStanfordCaliforniaUSA Department of Ecological Anthropology University of Texas at San AntonioSan AntonioTexasUSA

Primates access energy from plant fiber via bacterial fermentation in either a modified forestomach(‘foregut’),a caecocolic(‘hindgut’)chamber of the large intestine,or *** digestive retention times allow for more complete fermentation;as such,primates that consume an herbivorous diet high in fiber are expected to have both relatively and absolutely longer retention times than those mammals that rely on more readily digestible plant foods,such as *** used particulate markers to measure the digestive retention times of captive Allen’s swamp monkeys[Allenopithecus nigroviridis(Pocock,1907)](n=3)and L’Hoest’s monkey(Cercopithecus lhoesti ***,1899)(n=2).Results indicate mean retention times of 23.2-29.4 h and 23.2-24.0 h for *** and ***,*** from this study,in combination with previously published data on digestive retention times in other primate species,indicate that cercopithecines differ from other primate taxa by having lengthier retention times that can be predicted by body mass *** data are consistent with the hypothesis that relatively lengthy retention times are a primitive trait for Cercopithecinae.

关键词： Cercopithecinae digestive retention time evolution of diet fermentation plant fiber

Surface morphology and impurity distribution of electron beam recrystallized silicon films on low cost substrates for solar cell absorber

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Rare Metals 2006年第z1期25卷 195-200页

作者： GROMBALL f MüLLER j Department of Mikrosystemtechnik Technische Universitt Hamburg-Harburg Hamburg 21073 Germany

A line shaped electron beam recrystallised polycrystalline silicon film on the low cost substrate was investigated for the use of the solar cell absorber. The applied EB energy density strongly influences the surface morphology of the film system. Lower EB energy density results in droplet morphology and the rougher SiO2 capping layer due to the low fluidity. With the energy increasing, the capping layer becomes smooth and continuous and less and small pinholes form in the silicon film. Tungstendisilicide (WSi2) is formed at the interface tungsten/silicon but also at the grain boundaries of the silicon. Because of the fast melting and cooling of the silicon film, the eutectic of silicon and tungstendisilicide mainly forms at the grain boundary of the primary silicon dendrites. The SEM-EDX analysis shows that there are no chlorine and hydrogen in the area surrounding a pinhole after recrystallization because of outgassing during the solidification.

关键词： polycrystalline silicon film solar cell recrystallization energy surface morphology outgassing