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Gas-phase electrocatalytic conversion of CO_2 to chemicals on sputtered Cu and Cu–C catalysts electrodes

Journal of energy Chemistry 2019年第4期28卷 46-53页

作者： N.Gutiérrez-Guerra J.A.González J.C.Serrano-Ruiz E.López-Fernández J.l.Valverde A.de.lucas-Consuegra Departamento de Ingeniería Química Facultad de Ciencias y Tecnologías Químicas Universidad de Castilla-La Mancha Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada Universidad de Castilla-La Mancha Departamento de Ingeniería Universidad Loyola Andalucía

A novel gas-phase electrocatalytic ce.l containing a low-temperature proton exchange membrane(PeM)was developed to electrochemically convert CO_2into organic compounds.Two different Cu-based cathode catalysts(Cu and Cu–C)were prepared by physical vapor deposition method(sputtering)and subsequently employed for the gas-phase electroreduction of CO_2at different temperatures(70–90°C).The prepared electrodes Cu and Cu–C were characterized by X-ray diffraction(XRD),X-ray photoemission spectroscopy(XPS)and scanning electron microscopy(SeM).As reve.led,Cu is partially oxidized on the surface of the samples and the Cu and Cu–C cathodic catalysts were comprised of a porous,continuous,and homogeneous film with nanocrystalline Cu with a grain size of 16 and 8 nm,respectively.The influence of the applied current and temperature on the electro-catalytic activity and selectivity of these materials was investigated.Among the two investigated electrodes,the pure Cu catalyst film showed the highest CO_2specific electrocatalytic reduction rates and higher selectivity to methanol formation compared to the Cu–C electrode,which was attributed to the higher particle size of the former and lower Cu O/Cu ratio.The obtained results show potential interest for the possible use of electrical renewable energy for the transformation of CO_2into valuable products using low metal loading Cu based electrodes(0.5 mg Cu cm^(-2))prepared by sputtering.

关键词： C02 valorization electro-reduction Cu catalyst PeM Selectivity Methanol production

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Using organotypic hippocampal slice cultures to gain insight into mechanisms responsible for the neuroprotective effects of meloxicam: a role for gamma aminobutyric and endoplasmic reticulum stress

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Neural Regeneration Research 2019年第1期14卷 65-66页

作者： elisa landucci Irene.l.llorente Berta Anuncibay-Soto Domenico e.Pe.legrini-Giampietro Arsenio fernández-lópez Sezione di Farmacologia Clinica e Oncologia Dipartimento di Scienze della SaluteUniversità di Firenze Department of Neurology David Geffen School of Medicine University of California área de Biología Celular Instituto de BiomedicinaUniversidad de León Neural Therapies Sl Edificio Institutos de Investigación

This perspective aims to put into context the recent article by landucci et al.(2018)on mechanisms involved in the neuroprotective effects of meloxicam on an organotypic hippocampal slice cultures(OHSCs)model.In vitro ce.l cultures are the main method for studying large quantities of homogeneous ce.ls in an isolated environment.Thus,the use of primary dissociated neuron,astrocyte,oligodendrocyte,microglia,or endothelial ce.l cultures has become a standard

关键词： gamma 文化海马机制应力蜂窝环境学习胃

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回流合成体相的和稀释的青铜型W-Nb-O混合氧化物用于短链含氧化合物混合水溶液的定值化反应（英文）

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Chinese Journal of Catalysis 2019年第11期40卷 1778-1787页

作者： D.Delgado A.fernández-Arroyo N.la Salvia M.e.Domine Jose M.lópez Nieto 瓦莱尼亚理工大学化学技术研究所-高级科学研究理事会

本文报道了用回流法制备体相的和KIT-6稀释的青铜型W-Nb-O混合氧化物.研究了铌和介孔硅胶的掺入对催化剂物化性质的影响. Nb的加入有利于形成单相青铜结构氧化物,并改善了lewis酸性;而KIT-6的加入使混合金属氧化物颗粒在稀释剂上分散得... 详细信息

本文报道了用回流法制备体相的和KIT-6稀释的青铜型W-Nb-O混合氧化物.研究了铌和介孔硅胶的掺入对催化剂物化性质的影响. Nb的加入有利于形成单相青铜结构氧化物,并改善了lewis酸性;而KIT-6的加入使混合金属氧化物颗粒在稀释剂上分散得很好.这些稀释的W-Nb-O催化剂的比表面积和中孔体积增加.通过C-C键形成反应,对材料进行了模型混合水溶液(丙酮/丙醛/乙醇/乙酸/水重量比为5/25/10/30/30)的定值化试验.表面lewis酸性的增加是反应过程中总有机产率达最大的关键(C5-C10产物).最好的催化剂在连续使用五次后仍保持其催化性能.

关键词： KIT-6 W-Nb-O 氧化物含氧物水溶液生物质原料 C-C键形成

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Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

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Plasma Science and Technology 2017年第7期19卷 40-49页

作者： Rosendo Pe?A-eGUIlUZ José A lópez-fernández Antonio MeRCADO-CABReRA Bethsabet JARAMIllO-SIeRRA Régulo lópez-CAlleJAS Benjamín RODRíGUeZ-Méndez Raúl VAleNCIA-AlVARADO Allan A FlOReS-FUeNTeS Arturo e MU?OZ-CASTRO Plasma Physics laboratory Instituto Nacional de Investigaciones Nucleares Tecnológico de estudios Superiores de Tianguistenco Universidad Autónoma del estado de México

A new configuration of a resonant full-bridge flying capacitor multice.l inverter has been designed and constructed with the aim of achieving an extended output voltage frequency range with low harmonic distortion and reduced semiconductor commutation losses. This configuration was tested as a power supply for two different coaxial dielectric barrier discharge reactors, one of them employed for electric characterization and the other one for inorganic compound elimination in an aqueous solution. Two different gas mixtures, 90% Ar-10% 02 and 80% Ar-20% 02, were individually supplied during the experiments; the results showed a high- efficiency removal of meta-cresol （m-cresol） to the order of 98%, which was obtained by adding more oxygen to the plasma gas mixture.

关键词： plasma applications water pollution plasma sources power supply circuits electricdischarges

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Statistical evaluation of fluoride contamination in groundwater resources of Santiago del estero Province, Argentina

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Geoscience Frontiers 2020年第6期11卷 2197-2205页

作者： K.Rondano Gómez C.e.lópez Pasquali G.Paniagua González P.fernández Hernando R.M.Garcinuño Martínez Departamento de Ciencias Básicas Facultad de Ciencias ForestalesUniversidad Nacional de Santiago Del EsteroArgentina Departamento de Ciencias Analíticas Facultad de CienciasUniversidad Nacional de Educación a DistanciaSpain Departamento de Química Analítica Facultad de Agronomía y AgroindustriasUniversidad Nacional de Santiago Del EsteroArgentina

This study investigates the suitability of statistical techniques for evaluating the fluoride content and the groundwater quality from Robles Department(RD)and Banda Department(BD)in Santiago del estero(Argentina).For the original statistical study,evaluation of nine parameters(fluoride,pH,conductivity,atmospheric and water temperature,total dissolved solids,chloride,hardness,and alkalinity)of 110 collected underground water samples from 23 dispersed rural areas was proposed.Groundwater samples were obtained by sampling taken from we.ls at different depths.Fluoride.levels were determined by a standard colorimetric method in two seasonal periods,the dry(from April to September)and rainy(from October to March)period.The analytical results obtained for physicochemical parameters such as pH,total dissolved solids(TDS),and temperature does not reve.l any notable difference between the rainy and dry seasons studied.In both seasons,the atmospheric temperature average was 22℃.With respect to fluoride content,approximately 50%of the analysed groundwater samples exceeded the.limit established by current legislation(1.0 mg/l),obtaining concentration levels in the range of 0.01-2.80 mg/l.This study demonstrates the usefulness of the univariate statistical method(quartiles calculation,interquartile range IQR),multivariate principal component analysis(PCA),and cluster analysis to establish a better understanding of the state of the contamination of the waters in the region studied.

关键词： Source water protection Santiago del estero Multivariate statistical analysis Fluoride Spectrophotometry

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颈椎病和长时间脊髓压迫病人脑萎缩、白质损伤和功能适应性改变的MRI证据

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国际医学放射学杂志 2020年第2期 245-246页

作者： á.Bernabéu-Sanz J.V.Mollá-Torró S.lópez-Celadal P.M.lópez e.fernández-Jover 胡现宁 Magnetic Resonance Department Inscanner SL C/San Pedro Poveda

目的采用多种先进神经影像技术探讨颈椎病(CS)对脑的影响。方法纳入27例CS和24名年龄及性别匹配的健康对照者。采用改良的日本骨科协会评分系统

关键词：功能适应性 MRI 感觉运动皮质白质损伤颈椎病

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Abundance and harvest strategy of three species of clam (BivalviaVeneridae) located in new fishing banks in the Gulf of California

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Aquaculture and Fisheries 2021年第5期6卷 506-512页

作者： Jorge A.lópez-Rocha Francisco J.fernández-Rivera Melo ernesto Gastélum-Nava estefani larios-Castro laboratorio de Análisis espacial de Zonas Costeras Unidad Multidisciplinaria de Docencia e InvestigaciónFacultad de CienciasUniversidad Nacional Autónoma de M´exicoSisal97356YucatánMexico Comunidad y Biodiversidad A.C Guaymas85448SonoraMexico Centro de Investigaciones Biológicas Del Noroeste La Paz02320BCSMexico

Clams of the family Veneridae in northwest Mexico have traditionally been exploited by small-scale fisheries.Despite their socioeconomic importance for coastal communities in the region,most catch zones are currently in de.line due to a lack of harvest control regulations that would impede the de.letion of local fishing banks.In Puerto libertad,in the northern reaches of the Gulf of California,banks of commercially unexploited clam species,including Megapitaria aurantiaca,M.squalida and Dosinia ponderosa,were discovered.The adequate management and exploitation of these banks requires developing basic knowledge regarding the abundance of the species and establishing reference points to determine clear,simple harvest regulations.The goal of this study was to identify population abundance in these banks and ascertain the parameters of the.life history of the species found there in order to propose a harvest strategy that will allow the sustainable exploitation of this resource.A total of 288 transects were conducted in the two clam banks to identify species density.Abundance was determined using a geostatistical method.The relative cohort biomass-at-length was estimated to evaluate the effect of different lengths of first capture on the remaining biomass.Based on these data,two harvest control regulations were proposed:a maximum catch(Cmax)of 10%of the total estimated biomass,and a minimum optimal catch size.lc).The abundance estimates were M.squalida(266,293-381,881 individuals);D.ponderosa(2,779,100-3,455,597);and M.aurantiaca(408,783-447,391).The harvest control regulations proposed are:M.squalida,Cmax=2.98 t and lc=50.33 mm;D.ponderosa,Cmax=49.67 t and lc=103.44 mm;and M.aurantiaca,Cmax=15.87 t and lc=80.85 mm.These results are important as reference information for implementing harvest strategies in clam-fishing banks,and as a contribution to the management and sustainable exploitation of fisheries in the region.

关键词： Bivalves Fishery management Population size Sea of cortez Veneridae

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Safety of digoxin in nonagenarian patients with atrial fibrillation:lessons from the Spanish Multicenter Registry

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Journal of Geriatric Cardiology 2021年第10期18卷 809-815页

作者： Pablo Domínguez-erquicia Sergio Raposeiras-Roubín emad Abu-Assi María Cespón-fernández David Alonso-Rodríguez Santiago Jesús Camacho-Freire Naiara Cubelos-fernández Álvaro lópez-Masjuán Ríos María Melendo-Viu AndrésÍñiguez-Romo Department of Cardiology University HospitalÁlvaro CunqueiroVigoSpain He.lth Research Institute Galicia Sur VigoSpain Department of Cardiology University Hospital of LeónLeónSpain Department of Cardiology University Hospital Juan Ramón JiménezHuelvaSpain

BACKGROUND The association between digoxin and mortality is an unclear issue.In older patients with atrial fibrillation(AF),where use of digoxin is frequent,the evidence of its safety is scarce.Our aim is to assess the safety of digoxin in nonagenarian patients with AF.MeTHODS We evaluated data from 795 nonagenarian patients with non-valvular AF from the Spanish Multicenter Registry.We analyzed the relationship between digoxin and all-cause mortality with the Cox proportional-hazards model.ReSUlTS Follow-up was 27.7±18.3 months.Mean age was 92.5±3.8 years,and 71%of nonagenarian patients were female.Digoxin was not associated with increased risk of mortality[adjusted hazard ratio(aHR)=1.16,95%CI:0.96−1.41,P=0.130].However,we found a significant increase in mortality in the subgroup with estimated glomerular filtration rate(eGFR)l/min per 1.73 m^(2)(aHR=2.01,95%CI:1.13−3.57,P=0.018),but not in the other subgroups of eGFR(30−59 ml/min per 1.73 m^(2) and≥60 ml/min per 1.73 m^(2)).When exploring the risk of mortality according to sex,male subgroup was associated with an in-crease in mortality(aHR=1.48,95%CI:1.02−2.14,P=0.041).This was not observed in females subgroup(aHR=1.03,95%CI:0.81−1.29,P=0.829).Based on the presence or absence of heart failure,we did not find significant differences(aHR=1.20,95%CI:0.87−1.65,P=0.268 vs.aHR=1.15,95%CI:0.90−1.47,P=0.273,respectively).CONClUSIONS In our large registry of nonagenarian patients with AF,we did not find an association between digoxin and mortality in the total sample.However,in the subgroup analyses,we found an increase in mortality with the use of digoxin in men and in patients with an eGFRl/min per 1.73 m^(2).

关键词： patients digoxin fibrillation

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Application of a new reagent for analysis of oxygen presence in a lowcarbon ste.l wire rod

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Journal of Iron and Ste.l Research(International) 2021年第6期28卷 729-738页

作者： M.I.Dávila-Pérez H.J.Vergara-Hernández O.Vázquez-Gómez F.Reyes-Calderón e.lópez-Martínez J.M.Salgado-lópez National Technology of Mexico/T.I.of Morelia Morelia 58120MichoacanMexico National Council for Science and Technology CONACYT Mexico City 03940Mexico Isthmus University Santo Domingo TehuantepecOaxaca 70760Mexico engineering and Industrial Development Center CIDeSI Santiago de Queretaro 76125QueretaroMexico

A microstructural analysis was performed to determine the presence of oxygen in a wire rod section of AISI 1008 ste.l with a surface mechanical failure produced during wire drawing.The failure zone was analyzed by comparison using three different attack reagents:alkaline sodium chromate(ASC),ASC with hydrogen peroxide and amyl alcohol,and a solution of nitric acid in ethyl alcohol.The reagents were applied in samples in the failure zone,showing different types of zones in regions with internal and superficial defects such as carbides,pores,cracks,deformation,and detachment zones,indicating the possible presence of oxygen.The areas identified were observed by means of an optical microscope and were correlated with the content of elements that were present in the region using a scanning electron microscope and a scattered X-ray energy spectrometer,which determined that the areas identified by chromate sodium correspond to regions with a high concentration of oxygen and slag-forming elements such as silicon,aluminum,and iron;this is associated with the presence of oxygen in the oxide form.It was also observed that the ASC and the modified ASC solution with hydrogen peroxide and amyl alcohol could identify areas with a high presence of oxides,while the nitric acid solution only identified the ste.l microstructure.The modified ASC solution is an alternative to identify the presence of chemical variants of oxygen because the conventional formulation is unstable and has a too short shelf life,and therefore,its application must be carried out at the time of preparation.

关键词： etching Alkaline sodium chromate Oxide presence Internal defect

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Biocompatibility and electrochemical evaluation of ZrO_(2) thin films deposited by reactive magnetron sputtering on MgZnCa alloy

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Journal of Magnesium and Alloys 2021年第6期9卷 2019-2038页

作者： Benjamín Millán-Ramos Daniela Morquecho-Marín Phaedra Silva-Bermudez David Ramírez-Ortega Osmary Depablos-Rivera Julieta García-lópez Mariana fernández-lizárraga JoséVictoria-Hernández Dietmar letzig Argelia Almaguer-Flores Sandra e.Rodil Instituto de Investigaciones en Materiales Universidad Nacional Autónoma de MéxicoCDMX 04510Mexico Posgrado en Ciencia e Ingeniería de Materiales Universidad Nacional Autónoma de MéxicoCDMX 04510Mexico Unidad de Ingeniería de Tejidos Terapia Celular y Medicina RegenerativaInstituto Nacional de Rehabilitación Luis Guillermo IbarraCDMX 14389Mexico Posgrado en Ciencias Médicas Odontológicas y de la SaludUniversidad Nacional Autónoma de MéxicoCDMX 04510Mexico Instituto de Ciencias Aplicadas y Tecnologia Universidad Nacional Autónoma de MéxicoCDMX 04510Mexico Posgrado de Doctorado en Ciencias en Biomedicina y Biotecnología Molecular Escuela Nacional de Ciencias BiológicasInstituto Politécnico NacionalCDMX 11340Mexico Institute of Material and Process Design Helmholtz-Zentrum GeesthachtMax-Planck-Strasse 1Geesthacht 21502Germany Magnesium Innovation Centre MagIC Helmholtz-Zentrum GeesthachtMax-Planck-Strasse 1Geesthacht 21502Germany laboratorio de Biointerfases Facultad de OdontologíaDivisión de Estudios de Posgrado e InvestigaciónUniversidad Nacional Autónoma de MéxicoCDMX 04510Mexico

Biodegradable magnesium alloys are promising candidates for temporary fracture fixation devices in orthopedics;nevertheless,its fast degradation rate at the initial stage after implantation remains as one of the main challenges to be resolved.ZrO_(2)-based coatings to reduce the degradation rate of the Mg-implants are an attractive solution since they show high biocompatibility and stability.In this work,the degradation,cytotoxicity,and antibacterial performance of ZrO_(2)thin films deposited by magnetron sputtering on a Mg-Zn-Ca alloy was evaluated.Short-term degradation of ZrO_(2)-coated and uncoated samples was assessed considering electrochemical techniques and H_(2)evolution(gas chromatography).Additionally,long term degradation was assessed by mass-loss measurements.The results showed that a 380 nm ZrO_(2)coating reduces the degradation rate and H_(2)evolution of the alloy during the initial 3 days after immersion but allows the degradation of the bare alloy for the.long-term.The ZrO_(2)coating does not compromise the biocompatibility of the alloy and permits better ce.l adhesion and proliferation of mesenchymal stem ce.ls directly on its surface,in comparison to the bare alloy.Finally,the ZrO_(2)coating prevents the adhesion and biofilm formation of S.aureus.

关键词： Zirconium dioxide Magnetron sputtering Short-term degradation H_(2)evolution

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