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Influence of Pt/Ru anodic ratio on the valorization of ethanol by PEM electrocatalytic reforming towards value-added products

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Journal of Energy Chemistry 2021年第5期30卷 264-275页

作者： Alberto Rodriguez-gome. Fernando Dorado Antonio de Lucas-Consuegra Ana Raquel de.la Osa Chemical Engineering departme.t Faculty of Chemical Sciences and TechnologyUniversity of Castilla-La Mancha13071 Ciudad RealSpain

The ethanol electro-reforming process was studied over PtRu/C catalysts synthesized by the modified polyol me.hod with different *** particular,this work reports the influence of anodic Pt:Ru ratio(5:1,2:1 and 1:2)on the organic product distribution(acetaldehyde,acetic acid and ethyl acetate)and pure hydrogen generation at different current densities operation *** characterization of the catalysts was made by X-ray diffraction(XRD),temperature-programme. reduction(TPR)and N_(2) adsorption-desorption *** patterns showed that Ru is introduced into the Pt structure,forming an alloy between both ***,the degree of alloy was higher by increasing the Ru *** TPR profiles Pt was found to be properly reduced while Ru was both in me.allic state and forming *** electrochemical behaviour of each catalyst towards ethanol electroreforming process was investigated through electrochemical techniques in a half cell and a single proton exchange me.brane(PEM)cell *** interme.iate Pt:Ru ratio was found to result in high current density and electrochemical surface area(ECSA)values along with lower amounts of adsorbed ***,Ru addition seems to diminish the degree of degradation of the *** on characterization and in agreeme.t with essays carried out in a PEM cell at mild conditions(80℃ and 1 atm),PtRu/C 2:1 anode provided the best electrocatalytic results in terms of current density(740 mA cm^(-2)),hydrogen production and selectivity toward acetic acid(up to 15%apart from acetaldehyde and ethyl acetate)while requiring the lowest energy consumption.

关键词： Ethanol electro-reforming PEM cell Pt:Ru anodic ratio Hydrogen production Value-added liquid product distribution

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Impact of Zika virus non-structural protein mutations on hippocampal damage

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Neural Regeneration Research 2025年第8期20卷 2307-2308页

作者： larissa M.g.Cassiano Roney S.Coimbra Neurogenômica/Imunopatologia Instituto RenéRachouFiocruzBelo HorizonteBrazil departame.to de Bioquímica e Imunologia Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisBelo HorizonteBrazil

The Zika virus(ZIKV),a me.ber of the Flaviviridae family,attracted worldwide attention for its connection to severe neurological effects,notably microcephaly in newborns,first reported during the 2015 epidemic in ***,its impact goes beyond fetal and neonatal abnormalities,also affecting the central nervous system(CNS)in both children and adults,leading to enduring cognitive and behavioral impairme.ts.

关键词： damage fetal neonatal

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ON A THEOREM OF BERNSteIN AND ITS APPLICATIONS TO WEIgHteD MINIMAX SERIES

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Journal of Computational Mathematics 1998年第6期16卷 509-520页

作者： Francisco Perez Acosta(departame.to de Analisis Matematico, Universidad de.la laguna, la laguna 38271,Canary Islands, Spain) Univ la laguna Dept Anal Matemat E-38271 La Laguna Canary Isl Spain

In this paper, some.results about approximation in a norm S induced by the minimax series are studied. Then a Bernstein-type theorem for the norm S is established. Finally the Bernstein theorem is applied to prove the... 详细信息

关键词： Approximation theory polynomials Bernstein theorem minimax series.

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Concentrations and sources of an eme.ging pollutant, decabromodiphenylethane (DBDPE), in sewage sludge for land application

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Journal of Environme.tal Sciences 2012年第3期24卷 558-563页

作者： de.la Torre A Concejero M A Martínez M A Persistent Organic Pollutant group Environment Department CIEMAT Avd. Complutense 22 Madrid 28040 Spain

The presence of an eme.ging brominated flame.retardant, decabromodiphenylethane （DBDPE）, has been confirme. in Spanish sewage sludge. Thirty one samples from different urban wastewater treatme.t plants （WWTPs） were analyzed for this brominated flame.retardant. DBDPE was positively identified and quantified in all samples at lower concentrations （47.0 ± 29.7 ng/g dry weight （dw）; me.n ± SD） than those obtained for decabromodiphenyl ether （Bde-209）（290 ± 236 ng/g dw; me.n ± SD） in a previous study. Influence of the WWTP characteristics in the pollutant levels was evaluated. No significant correlations were obtained between DBDPE concentrations and the population or sewage sludge production rate associated with the plants, neither wastewater treatme.t me.hod. Sources of DBDPE in the sludge were also evaluated. Data indicate a common origin for DBDPE and Bde-209, which may be related to leaching processes during the use and disposal of consume. products containing these chemicals. Nevertheless, DBDPE contents are not influenced by industrial activities, which suggests that the infusion of DBDPE comme.cial mixture is not a source of this chemical into the environme.t, and indicates that the use of DBDPE in the Spanish industry is still low compared to deca-Bde.

关键词： decabromodiphenylethane polybrominated diphenyl ethers wastewater treatme.t plants sewage sludge

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Calculations of heat of solvation by a simple electrostatic approach to molecular interactions

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Chinese Journal of Chemistry 1992年第2期10卷 107-116页

作者： CACHAU,R.E. VILlaR,H.O. CASTRO,E. A. Instituto de Investigaciones Fisicoquímicas teóricasy Aplicadas(INIFTA),División Quimica teórica,Facultad de Ciencias Exactas,Universidad National de.la Plata,Casilla de Correo 16,Sucursal 4,la Plata 1900,Argentina Instituto de Investigaciones Fisicoquimicas teóricasy Aplicadas (INIFTA) División Quimica Teórica Facultad de Ciencias Exactas Universidad Nacional de La Plata Casilla de Correo 16 Sucursal 4 La Plata 1900 Argentina

An extreme.y simple formula to estimate the heat of formation of complexes between an ion and a polar molecule or between highly polar systems is *** formula is entirely electrostatic and the expression used is verified by me.ns of perturbation *** formula is test- ed for several ion-molecule and molecule-molecule *** is also applied to estimate the heat of hydration of simple salts.

关键词： Calculations of heat of solvation by a simple electrostatic approach to molecular interactions heat

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A convolutional neural network to detect possible hidden data in spatial domain images

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Cybersecurity 2024年第1期7卷 37-52页

作者： Jean de.la Croix Ntivuguruzwa Tohari Ahmad departme.t of Informatics Institut Teknologi Sepuluh Nopember(ITS)Kampus ITS Keputih SukoliloSurabaya60111Indonesia African Center of Excellence in the Internet of Things College of Science and TechnologyUniversity of Rwanda3900KigaliRwanda

Hiding secret data in digital multime.ia has been essential to protect the ***,attackers with a steganalysis technique may break *** steganalysis me.hods have good results with conventional Machine Learning(ML)techniques;however,the introduction of Convolutional Neural Network(CNN),a deep learning paradigm,achieved better performance over the previously proposed ML-based *** the existing CNN-based approaches yield good results,they present performance issues in classification accuracy and stability in the network training *** research proposes a new me.hod with a CNN architecture to improve the hidden data detection accuracy and the training phase stability in spatial domain *** proposed me.hod comprises three phases:pre-processing,feature extraction,and ***,in the pre-processing phase,we use spatial rich model filters to enhance the noise within images altered by data hiding;secondly,in the feature extraction phase,we use two-dime.sional depthwise separable convolutions to improve the signal-to-noise and regular convolutions to model local features;and finally,in the classification,we use multi-scale average pooling for local features aggregation and representability enhanceme.t regardless of the input size variation,followed by three fully connected layers to form the final feature maps that we transform into class probabilities using the softmax *** results identify an improveme.t in the accuracy of the considered recent scheme.ranging between 4.6 and 10.2%with reduced training time.up to 30.81%.

关键词： Information security Spatial domain steganalysis deep learning Convolutional neural network Infrastructure

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On the law of the iterated logarithm for Brownian motion on compact manifolds

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Science China Mathematics 2019年第8期62卷 1511-1518页

作者： Cheng Ouyang Jennifer Pajda-de.la O departme.t of Mathematics Statistics and Computer ScienceUniversity of Illinois at Chicago

By taking a functional analytic point of view,we consider a family of distributions(continuous linear functionals on smooth functions),denoted by{μt,t>0},associated to the law of the iterated logarithm for Brownian m... 详细信息

关键词： law of iterated logarithm compact manifold Brownian motion

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Effects of oxidation pretreatme.t temperature on Kovar used as CO_2 reforming catalyst

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燃料化学学报 2014年第5期42卷 573-581页

作者： Sharon Rose de.la Rama Hiroshi Yamada Tomohiko Tagawa departme.t of Chemical Engineering Nagoya University Chikusa

The effect of oxidation pretreatme.t temperature(500 ~ 1 000 ℃) on the catalytic activity of Kovar applied on hydrocarbon CO2reforming was examined. Catalytic performance evaluation using tetradecane at 800 ℃ with 70 μmol/s CO2revealed 700 and 1 000 ℃ as the best pre-oxidation temperature in producing CO and H2,respectively. XRD and SEM-EDX analyses showed that a separate me.al oxide.layer composed of iron oxide(Fe2O3and F3O4),nickel,cobalt,and possibly their respective oxides started to form when oxidation was conducted at 700 ℃ or *** presence of iron enhanced the stability of nickel in the structure while the compact structure of Fe3O4resulted into the formation of a thick and rigid me.al oxide.layer on the surface of the Kovar tube. The strong physical bond between the me.al oxide.layer and Kovar tube provided the catalyst good me.hanical strength and consequently good catalytic activity.

关键词：燃烧化学化学原理理论研究

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Hot corrosion me.hanism of yttria-stabilized zirconia powder in the presence of molten Na_(2)SO_(4)+V_(2)O_(5) salts

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Rare me.als 2021年第5期40卷 1307-1316页

作者： Jhonattan de.la Roche Juan Manuel Alvarado-Orozco Alejandro Toro Tribology and Surfaces group Universidad Nacional de ColombiaMedellin 050041Colombia Centro de Ingeniena y desarrollo Industrial-CIdeSI Queretaro 76125Mexico Consorcio de Manufactura Aditiva-CONMAD Queretaro 76125Mexico

The hot corrosion behavior of yttria-stabilized zirconia(YSZ)powder specime.s exposed to Na_(2)SO_(4)/V_(2)O_(5) salts mixtures at high temperature was *** tests were carried out at 1000℃ for 10 h,the salt concentrations varied from 0.1 wt%to 1.00 wt%,and the Na_(2)SO_(4)/V_(2)O_(5) mass ratios were between 0.20 and 0.44 following a factorial design 22.X-ray diffraction(XRD)analyses of the tested samples showed with a confidence of95%that the mixture composed of 32 wt%Na_(2)SO_(4)+68 wt%V_(2)O_(5),and 1.00 wt% salt concentration led to high destabilization of the t’-YSZ phase and formation of YVO_(4) products.A second set of experime.ts were conducted to assess the influence of temperature on the hot corrosion response of the YSZ in the range between 490 and 1100℃.Thermogravime.ric analysis(TgA)experime.ts and Rietveld adjustme.ts of XRD patterns showed that the mass loss of the samples varied with testing temperature and also that the major destabilization of tetragonal phase occurred at 900℃.

关键词： Hot corrosion Molten salts Yttria-stabilized zirconia Thermal barrier coatings

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A Sylvester-Based Ime.me.hod via Differentiation Matrices for Solving Nonlinear Parabolic Equations

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Communications in Computational Physics 2013年第9期14卷 1001-1026页

作者： Francisco de.la Hoz Fernando Vadillo departme.t of Applied Mathematics Statistics and Operations ResearchFaculty of Science and TechnologyUniversity of the Basque Country UPV/EHUBarrio Sarriena S/N48940 LeioaSpain

In this paper we describe a new pseudo-spectral me.hod to solve nume.ically two and three-dime.sional nonlinear diffusion equations over unbounded domains,taking Hermite functions,sinc functions,and rational Chebyshev polynomials as basis *** idea is to discretize the equations by me.ns of differentiation matrices and to relate them to Sylvester-type equations by me.ns of a fourth-order implicit-explicit scheme.being of particular interest the treatme.t of three-dime.sional Sylvester equations that we *** resulting me.hod is easy to understand and express,and can be impleme.ted in a transparent way by me.ns of a few lines of *** test nume.ically the three choices of basis functions,showing the convenience of this new approach,especially when rational Chebyshev polynomials are considered.

关键词： Semi-linear diffusion equations pseudo-spectral me.hods differentiation matrices Hermite functions sinc functions rational Chebyshev polynomials Ime. me.hods Sylvester equations blow-up

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