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Effect of heat treatment on the mechanical and biocorrosion behaviour of two Mg-Zn-Ca alloys

Journal of Magnesium and Alloys 2022年第2期10卷 581-595页

作者： N.pulido-González p.Hidalgo-Manrique S.García-rodríguez B.Torres J.Rams Departamento de Matemática Aplicada Ciencia e Ingeniería de Materiales y Tecnología ElectrónicaESCETUniversidad Rey Juan CarlosC/Tulipán s/nMóstolesMadrid28933Spain

The effect of heat treatment on the mechanical and biocorrosion behaviour of the Mg-1 wt.%Zn-1 wt.%Ca(ZX11)and Mg-3 wt.%Zn-0.4 wt.%Ca(ZX30)alloys was *** this purpose,three-point bending tests as well as electrochemical and immersion tests in Hank’s solution were performed on both alloys in four different thermal conditions:as-cast,solution-treated,peak-aged and *** examinations revealed that the as-cast ZX11 and ZX30 alloys exhibit a microstructure composed ofα-Mg grains separated by large Mg_(2)Ca and Ca_(2)Mg_(6)Zn_(3) particles and by large Ca_(2)Mg_(6)Zn_(3) particles,*** solution treatment,the Ca_(2)Mg_(6)Zn_(3) precipitates at the grain boundaries(GBs)are fully dissolved in the ZX11 alloy,but mainly redistributed to form a more connected configuration in the ZX30 alloy,showing a poor age-hardening ***,after solution-treatment,galvanic corrosion and corrosion rate decreases in the former,but increases in the *** peak-aged condition displays the highest corrosion rate for both alloys,maybe due to an excessive number density of fine Ca_(2)Mg_(6)Zn_(3) particles acting as cathodic ***,the over-aged condition shows the lowest corrosion rate for the ZX11 alloy and a very similar one to that of the as-cast sample for the ZX30 *** ZX11 alloy shows generally better biocorrosion behaviour than the ZX30 alloy to its lower content in the Ca_(2)Mg_(6)Zn_(3) phase and thus reduced galvanic *** Mg_(2)Ca phase present in the studied ZX11 alloy has been proved to exhibit an increased corrosion potential,which has been related to an observed enrichment with Zn.

关键词： Magnesium alloys Biodegradable implants Heat treatment Microstructure Mechanical properties Corrosion

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New species and new records of Meliolaceae from panama

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Fungal Diversity 2015年第1期70卷 73-84页

作者： Délfida rodríguez Justavino Roland Kirschner Meike piepenbring Universidad Autónoma de Chiriquí(UNACHI) El CabreroDavidChiriquíPanamá Department of Life Sciences National Central UniversityJhongli CityTaoyuan County 32001Taiwan Republic of China Department of Mycology Cluster for Integrative Fungal Research(IPF)Institute of EcologyEvolution and DiversityGoethe-University of FrankfurtMax-von Laue-Str.1360439 Frankfurt am MainGermany

Three new species of Meliolaceae,Appendiculella monsterae on Monstera deliciosa(Araceae),Asteridiella nitidae on Buddleja nitida(Scrophulariaceae),and Irenopsis chrysophylli on Chrysophyllum sp.(Sapotaceae),are described based on material collected in *** species of Meliolaceae are reported for the first time for panama,which include four first records for the Americas,***,Meliola indica,and ***,previously known only from Asia,and *** hitherto known only from *** species of plants are cited as hosts for meliolaceous fungi for the first *** a phylogenetic hypothesis based on 28S nrDNA sequences,the position of Meliolales,including Appendiculella,Asteridiella,Endomeliola,Irenopsis,and Meliola,is found to be basal to Sordariomycetidae,Hypocreomycetidae,and Xylariomycetidae within *** five genera of Meliolaceae form a strongly supported *** suggest adopting the concept of the subclass *** monophyly of Asteridiella cannot be confirmed.A hypothetical close relationship between Asteridiella and Appendiculella is not supported,but Endomeliola appears closely related to a species of *** Meliola species on the same host family are closely related.

关键词： Appendiculella Ascomycota Asteridiella Irenopsis Meliola Tropical plant parasitic fungi

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Confounding response of macrofauna from a confluence of impacts: brine and sewage pollution

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Acta Oceanologica Sinica 2013年第10期32卷 74-81页

作者： rodrigo Riera Fernando Tuya Myriam rodríguez óscar Monterroso Eva Ramos Centro de Investigaciones Medioambientales del Atlántico (CIMA SL) Arzobispo Elías Yanes 4438206 La LagunaTenerifeCanary IslandsSpain BIOGES University of Las Palmas de G.C.35017 Las Palmas de Gran CanariaCanary IslandsSpain

Throughout the shores of the world, a confluence of different sources of pollution is common, e.g., through outlets releasing brine, industrial, and domestic sewage. In this study, we assessed whether a combined disposal of domestic sewage and brine altered the patterns of abundance and assemblage structure of sub- tidal macrofauna inhabiting sandy seabeds on the south coast of Gran Canaria （Canary Islands, NE Atlantic Ocean）. Samples were collected in two surveys （May 2008 and January 2009） at three distances （0, 15, and 30 m） away from the discharge point. Macrofaunal abundances showed different patterns with varying proximity from the disposal point in the two surveys. In May 2008, lower abundances were observed at 0 m （53.89±46.82 ind.） than at 15 m （120±91.7 ind.） and 30 m （283.89±189.33 ind.） away from the dis- posal point. In January 2009, however, higher abundances were observed at 0 m （131.33±58.69 ind.） than at 30 m （100±24.44 ind.） and 15 m （84.78±58.39 ind.） away from the disposal point. Significant differ- ences in macrofaunal assemblage structure were found with varying proximity from the discharge point in both surveys. The effect of proximity from the disposal point was confounded by changes in sedimen- tary composition between surveys, which contributed to explain differences in macrofaunal abundances and assemblage structure with varying proximity from the discharge point. As a result, confounding driver- s of macrofaunal assemblage structure, here, changes in sediment composition, accounted for changes in macrofaunal abundances and assemblage structure with varying proximity from a combined disposal point of brine and sewage.

关键词： macrofauna amphipoda polychaeta brine sewage Canary Islands

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Gromov Hyperbolicity of periodic planar Graphs

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Acta Mathematica Sinica,English Series 2014年第1期30卷 79-90页

作者： Alicia CANTóN Ana GRANADOS Domingo pESTANA José Manuel rodríguez Departamento de Ciencias Aplicadas a la Ingeniería Naval ETSINUniversidad Politécnica de MadridAvenida Arco de la Victoria4Ciudad Universitaria28040 MadridSpain Mathematics Division St.Louis University (Madrid Campus)Avenida del Valle 348003 MadridSpain Departamento de Matemáticas Universidad Carlos III de MadridAvenida de la Universidad 308911 LeganésMadridSpain

The study of hyperbolic graphs is an interesting topic since the hyperbolicity of a geodesic metric space is equivalent to the hyperbolicity of a graph related to *** main result in this paper is a very simple charact... 详细信息

关键词： planar graphs periodic graphs Gromov hyperbolicity infinite graphs geodesics

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Gold nanoshells： Contrast agents for cell imaging by cardiovascular optical coherence tomography

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Nano Research 2018年第2期11卷 676-685页

作者： Jie Hu Francisco Sanz-rodríguez Fernando Rivero Emma Martín rodríguez Río Aguilar Torres Dirk H. Ortgies José García Solé Fernando Alfonso Daniel Jaque Fluorescence Imaging Group Departamento de Física de Materiales Instituto Nicolás Cabrera Facultad de Ciencias Universidad Autónoma de Madrid Madrid Spain Instituto Ramón y Cajal de Investigación Sanitaria Hospital Ramón y Cajal Madrid Spain Departamento de Biología Universidad Autónoma de Madrid Madrid Spain Cardiology Department Hospital Universitario de la princesa IIS-IP Universidad Autónoma de Madrid Madrid Spain

Optical coherence tomography （OCT） has gained considerable attention in interventional cardiovascular medicine and is currently used in clinical settings to assess atherosclerotic lesions and to optimize stent placement. Artery imaging at the cellular level constitutes the first step towards cardiovascular molecular imaging, which represents a major advance in the development of personalized noninvasive therapies. In this work we demonstrate that cardiovascular OCT can be used to detect individual cells suspended in biocompatible fluids. Importantly, the combination of this catheter-based clinical technique with gold nanoshells （GNSs） as intracellular contrast agents led to a substantial enhancement in the backscattered signal produced by individual cells. This cellular contrast enhancement was attributed to the large backscattering cross-section of GNSs at the OCT laser wavelength （1,300 nm）. A simple intensity analysis of OCT cross-sectional images of suspended cells makes it possible to identify the sub-population of living cells that successfully incorporated GNSs. The generalizability of this method was demonstrated using two different cell lines （HeLa and Jurkat cells）. This work provides novel insights into cardiovascular molecular imaging using specifically modified GNSs.

关键词： optical coherencetomography (OCT)intravascular imaging gold nanoparticles three-dimensional (3D)imaging

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A Non-Destructive Time Series Model for the Estimation of Cherry Coffee production

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Computers, Materials & Continua 2022年第3期70卷 4725-4743页

作者： Jhonn pablo rodríguez David Griol Zoraida Callejas Juan Carlos Corrales Telematics Engineering Group University of CaucaPopayán190002Colombia INRAE University of ToulouseUMR 1248 AGIRF-31326Castanet TolosanFrance Department of Software Engineering University of GranadaGranada18071Spain

Coffee plays a key role in the generation of rural employment in *** than 785,000 workers are directly employed in this activity,which represents the 26%of all jobs in the agricultural *** coffee growers estimate the production of cherry coffee with the main aim of planning the required activities,and resources(number of workers,required infrastructures),anticipating negotiations,estimating,price,and foreseeing losses of coffee production in a specific *** important processes can be affected by several factors that are not easy to predict(e.g.,weather variability,diseases,or plagues.).In this paper,we propose a non-destructive time series model,based on weather and crop management information,that estimate coffee production allowing coffee growers to improve their management of agricultural activities such as flowering calendars,harvesting seasons,definition of irrigation methods,nutrition calendars,and programming the times of concentration of production to define the amount of personnel needed for *** combination of time series and machine learning algorithms based on regression trees(XGBOOST,TR and RF)provides very positive results for the test dataset collected in real conditions for more than a *** best results were obtained by the XGBOOST model(MAE=0.03;RMSE=0.01),and a difference of approximately 0.57%absolute to the main harvest of 2018.

关键词： Cherry coffee production estimation learner approaches time series weather data crop management data

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Unravelling host-mediated effects on hemiparasitic Mexican mistletoe psittacanthus calyculatus(DC.)*** traits linked to mutualisms with pollinators and seed dispersers

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Journal of plant Ecology 2018年第6期11卷 827-842页

作者： Sandra rodríguez-Mendieta Carlos Lara Juan Francisco Ornelas Centro de Investigación en Ciencias Biológicas Universidad Autónoma de Tlaxcalakm 10.5 Carretera San Martín Texmelucan-TolucaSan Felipe IxtacuixtlaTlaxcala 90120Mexico Departamento de Biología Evolutiva Instituto de EcologíaA.C.(INECOL)Carretera antigua a Coatepec 351XalapaVeracruz 91080Mexico

Aims While the influence of mistletoe-host interactions on each other’s evolution is well-recognized,the role of interactions between mis-tletoes and its mutualistic pollinators and seed dispersers mediated by host species is relatively *** Here,we examine the effects of host species(Mexican hawthorn Crataegus mexicana DC,black cherry prunus serotina Ehrh.,leather-leaf Mexican oak Quercus crassipes Bonpl.)on flower morphology,nectar production,pollinator visitation rate and female reproduct-ive fitness in hemiparasitic Mexican mistletoe psittacanthus caly-culatus(DC.)***(Loranthaceae)populations at three different *** first measured the lengths of corolla,style,stamen,exerted stamen and anther,the length and width of the ovary and nectar availability for mistletoe flowers in natural ***,we evaluated flower visitation and measured(length and width)and weighed the fruits and its seeds of mistletoes growing on each of the three host ***,we evaluated the effects of host species,location and flower traits on fruit or seed size variation(both as proxies of reproductive fitness).Important Findings We found mistletoes growing on natural hosts *** and *** produced larger flowers,fruits and seeds than mistle-toes on cultivated ***,these differences varied across *** amount of available nectar and hummingbird vis-itation rates in flowers of mistletoes on *** was higher at the three sites than in flowers of mistletoes on *** or *** effects of host species,study site and floral trait covariates affected significantly all fitness measures,indicating that mistletoes’reproductive fitness is affected differently depending on the host species and their site of *** host-associated differ-ences in reproduction might have implications for interactions with mutualistic vectors.

关键词： floral and fruit traits hosts hummingbirds local host adaptation mistletoes nectar parasitic plants pollination psittacanthus

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An atypical case of disseminated cutaneous leishmaniasis due to Leishmania peruviana in the valleys of Ancash-peru

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Asian pacific Journal of Tropical Medicine 2017年第11期10卷 1101-1103页

作者： diego Espinoza-Morales Aldo Lucchetti rodríguez Wilmer Silva-Caso Luis Suarez-Ognio María J.pons Juana del Valle Mendoza School of Medicine Health Sciences FacultyUniversidad Peruana de Ciencias AplicadasAv.San Marcos cdra Cedros de Villa LimaPeru 2Infectology ServicieHospital Arzobispo LoayzaAv.Alfonso Ugarte 848Cercado de LimaLimaPeru Research Center and Innovation of the Health Sciences Faculty Universidad Peruana de Ciencias AplicadasAv.San Marcos cdra 2 ChorrillosLimaPeru

We present an atypical case of disseminated cutaneous leishmaniasis in the Sihuas district, located in the Andean valleys of Ancash-peru. A 62-year-old man with no particular medical history presented multiple lesions located on the inferior abdomen, lumbar region and the right anterior thigh. Histological analysis found leishmanial amastigotes in the lesion sample, the Montenegro reaction was positive for Leishmania spp, and the polymerase chain reaction was positive for Leishmania peruviana. In conclusion, the atypical presentation of this disease may be related to the presence of an uncommon parasite strain or host immune deficiencies. The molecular identification of the etiology for disseminated leishmaniasis, will allow a better understanding of the presentation and proper treatment,as well as associated risk factors.

关键词： Leishmaniasis Leishmania peruviana pCR peru

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Effect of deep cryogenic treatment on the microstructural,mechanical and ballistic properties of AA7075-T6 aluminum alloy

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Defence Technology（防务技术） 2023年第12期30卷 101-110页

作者： S.Dharani kumar U.Magarajan Saurabh S Kumar rodríguez-Millan M Centre for Machining and Material Testing KPR Institute of Engineering and TechnologyCoimbatoreIndia Department of Mechanical Engineering Sri Venkateswara College of EngineeringChennaiIndia Scientific Officer Ballistic Research Centre&Testing RangeNational Forensic Sciences UniversityGandhi NagarIndia Department of Mechanical Engineering University Carlos Ⅲ of MadridLeganesMadridSpain

The study focused on investigating the effect of Deep Cryogenic Treatment(DCT)on the mechanical and ballistic properties of AA7075-T6 aluminum *** microstructure,microhardness,tensile strength,and impact strength of the Base Material(BM)and DCT-treated 7075 samples were analyzed through metallographic analysis and mechanical *** microstructure of the DCT-treated 7075 samples revealed fine grains and a distribution of secondary phase *** tensile strength,impact strength,and microhardness of DCT-treated samples increased by 7.41%,4%,and 9.68%,respectively,compared to the BM *** fractography analysis of the tensile samples showed cleavage facets,microvoids,and dimples in both the *** ballistic behavior of the BM and DCT target plates were studied by impacting hard steel core projectiles at a velocity of 750±10 m/*** target plates failed due to petaling and ductile hole enlargement,and the depth of penetration(DOp)of the DCT target was less than that of the BM target,indicating a higher ballistic *** post-ballistic microstructure examination of the target plates showed the formation of an Adiabatic Shear Band(ASB)without any *** was concluded that the DCT treatment improved the mechanical and ballistic properties of the aluminum alloy due to grain refinement and high dislocation density.

关键词： Deep cryogenic treatment AA7075-T6 Mechanical properties Ballistic Adiabatic shear band

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phylogenetic endemism of the orchids of Megamexico reveals complementary areas for conservation

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plant Diversity 2022年第4期44卷 351-359页

作者： Brandon E.Gutierrez-rodríguez Marilyn Vasquez-Cruz Victoria Sosa Instituto de Ecología AC Carretera Antigua a Coatepec 351El Haya91073 XalapaVeracruzMexico Unidad de Genomica Avanzada Laboratorio Nacional de Genomica para La BiodiversidadCentro de Investigaciony Estudios Avanzados IrapuatoLibramiento Norte Carretera Leon Km.9.636821 IrapuatoGuanajuatoMexico

Orchid diversity provides a unique opportunity to further our understanding of biotic and abiotic factors linked to patterns of richness,endemism,and phylogenetic endemism in many ***,orchid diversity is consistently threatened by illegal trade and habitat ***,we identified areas critical for orchid conservation in the biogeographic province of *** this purpose,we evaluated orchid endemism,phylogenetic diversity,and phylogenetic endemism within Megamexico and characterized orchid life *** results indicate that the majority of the regions with the highest estimates of endemism and phylogenetic endemism are in southern Mexico and northern Central America,mostly located on the pacific side of *** the most important orchid lineages,several belong to epiphytic lineages such as pleurothallidinae,Laeliinae and *** also found that species from diverse and distantly related lineages converge in montane forests where suitable substrates for epiphytes ***,the southernmost areas of phylogenetic diversity and endemism of Megamexico are in unprotected ***,we conclude that the most critical areas for orchid conservation in Megamexico are located in southern Mexico and northern Central *** recommend that these areas should be given priority by the Mexican system of natural protected areas as complementary conservation areas.

关键词： Epiphytes Geophytes Orchids phylogenetic endemism Weighted endemism

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