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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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Virtual Conductance Based Cascade Voltage Controller for VSCs in Islanded Operation Mode

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1704-1713页

作者： Francisco Jesús Matas-Díaz Manuel Barragán-Villarejo juan carlos Olives-Camps juan Manuel Mauricio JoséMaría Maza-Ortega Department of Elec‐trical Engineering Universidad de SevillaSeville 41092Spain

Voltage source converters have become the main enabler for the integration of distributed energy resources in *** the case of islanded operation,these devices normally set the amplitude and frequency of the network voltage by means of a cascade controller composed of an outer voltage control loop and an inner current control *** strategies to compute the gains of both control loops have been proposed in the literature in order to obtain a fast and decoupled response of the voltages at the point of common *** paper proposes an alternative and simple methodology based on the introduction of a virtual conductance in the classic cascade *** strategy allows to design each control loop independently,obtaining a closed-loop response of a first-order *** this way,the gains of each control loop are easily derived from the parameters of the LC coupling filter and the desired closed-loop time ***,a state observer is included in the controller to estimate the inductor current of the LC filter in order to reduce the number of required measurements.A laboratory testbed is used to validate and compare the proposed *** experimental results demonstrate the effectiveness of the proposal both in steady-state and transient regimes.

关键词： Voltage source converter microgrid cascade controller virtual conductance

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Influence of V(C,N) Precipitates on Microstructure and Mechanical Properties of Continuous Cooled C-Mn-V

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Journal of Iron and Steel Research International 2011年第S1期18卷 266-270页

作者： carlos Garcia-Mateo carlos Capdevila juan Cornide Jesus Chao Francisca G Caballero carlos Garcia de Andres Materalia Research Group Department of Physical Metallurgy Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC)Avda.Gregorio del Amo8 E-28040 MadridSpain

The effect of chemical composition and processing parameters on the formation of acicular ferrite and/or bainite has been *** particular,this paper deals with the influence that N through its combination with V,as V(C,N) precipitates,has on the decomposition of ***,the intragranular nucleation potency of V(C,N) precipitates is analyzed through the continuous cooling transformation diagrams (CCT) of two C-Mn-V steels with different contents of *** reported in this work allow us to conclude that acicular ferrite can only be achieved alloying with vanadium and nitrogen,meanwhile bainite is promoted in steels with a low level of *** is concluded that higher strength values are obtained in acicular ferrite than in bainitic steel but a similar brittle-ductile transition temperature (BDT),and lower values of impact absorbed energy (KV) has been recorded in nitrogen-rich steel.

关键词： acicular ferrite bainite vanadium precipitates mechanical properties

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Systemic Activation of Defensive Enzymes and Protection in Tobacco Plantlets against <i>Phytophthora nicotianae</i>Induced by Oligosaccharins

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American Journal of Plant Sciences 2014年第21期5卷 3354-3363页

作者： Alejandro Bernardo Falcón-rodríguez Daimy Costales juan carlos Cabrera Ruddy Wattiez Miguel ángel Martínez-Téllez Group of Bioactive Products Department of Plant Physiology and Biochemistry National Institute of Agricultural Science Mayabeque Cuba Unit of Biotechnology Materia-Nova Ghislenghiem Belgium Institute of Biosciences University of Mons Mons Belgium Center for Food Research and Development (CIAD) Coordination of Technology of Foods from Plant Origin Hermosillo Mexico

Oligosaccharins are potent biomolecules which activate defense responses and resistance in tobacco plants. However, it is not known the systemic behavior of defensive enzymes activated by these elicitors. In this work, the dynamic behavior of key defensive enzymes was evaluated in tobacco plant leaves previously treated through the roots with chitosan polymer (CH), chitosan (COS) and pectic (OGAS) oligosaccharides and Spermine (Sp). All macromolecules tested activated protein levels and defense enzymatic activity in tobacco leaves but with different response dynamics among them and depending on the biochemical variable evaluated. Defense response above control levels were detected since 12 hours after treatments and it consisted in a biphasic behavior with two peaks for PAL (EC 4.***.1.5) and β 1 - 3 glucanase (EC 3.***.1.6) enzymatic activities. The highest enzymatic levels for these enzymes were achieved at 48 hours in plantlets elicited with COS and at 72 hours for those plants treated with chitosan polymer, while the highest POD (EC 1.***.1.6) activity was detected with CH between 48 and 72 hours. These results demonstrated systemic defense activation by oligosaccharins in tobacco whose dynamic of defense response is affected by the kind of oligosaccharins tested. When applying OGAS by foliar spray on tobacco, systemic resistance against Phytoththora nicotianae was induced and plantlets were protected with the low concentration tested by 46% under the bioassays conditions performed. Moreover, enzymatic determinations on roots and leaves previous to plant-pathogen interaction showed increments above 30% of control levels for PAL and POD activities. It means that oligosaccharins activate local and systemic defense responses in plants in the absent of pathogen infection.

关键词： Systemic Induced Resistance Oligosaccharins Tobacco Defensive Enzymes

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New perspectives in the management of small cell lung cancer

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World Journal of Clinical Oncology 2022年第6期13卷 429-447页

作者： Cristina Pangua Jacobo Rogado Gloria Serrano-Montero JoséBelda-Sanchís BeatrizÁlvarez rodríguez Laura Torrado Nuria rodríguez De Dios Xabier Mielgo-Rubio juan carlos Trujillo Felipe Couñago Department of Medical Oncology Hospital Universitario Infanta LeonorMadrid 28031Spain Department of Thoracic Surgery Hospital de la Santa Creu i Sant Pau&Hospital de MarUniversitat Autònoma de BarcelonaBarcelona 08041CataloniaSpain Department of Radiation Oncology Hospital Universitario HM SanchinarroHM HospitalesHM CIOCC Centro Integral Oncológico Clara CampalMadrid 28050Spain Department of Radiation Oncology Hospital Universitario Lucus Augusti&Instituto de Investigación Sanitaria Santiago de Compostela(IDIS)Lugo 27003Spain Department of Radiation Oncology Hospital Del Mar&Hospital Del Mar Medical Research Institute(IMIM)&Pompeu Fabra UniversityBarcelona 08003CataloniaSpain Department of Medical Oncology Alcorcón Foundation University HospitalAlcorcón 28922MadridSpain Department of Thoracic Surgery Hospital de la Santa Creu i Sant PauBarcelona 08029Spain Department of Radiation Oncology Hospital Universitario Quirónsalud MadridHospital La LuzUniversidad Europea de MadridMadrid 28223Spain

The treatment of small cell lung cancer(SCLC)is a challenge for all specialists *** treatments have been added to the therapeutic armamentarium in recent months,but efforts must continue to improve both survival and quality of *** in surgery and radiotherapy have resulted in prolonged survival times and fewer complications,while more careful patient selection has led to increased staging *** in the field of systemic therapy have resulted in changes to clinical guidelines and the management of patients with advanced disease,mainly with the introduction of *** this article,we describe recent improvements in the management of patients with SCLC,review current treatments,and discuss future lines of research.

关键词： Small cell lung cancer Whole-brain radiotherapy Prophylactic cranial irradiation Stereotactic body radiotherapy Immunotherapy Atezolizumab Durvalumab

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Variations of OCT measurements corrected for the magnification effect according to axial length and refractive error in children

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Journal of Innovative Optical Health Sciences 2018年第1期11卷 123-137页

作者： Inmaculada Bueno-Gimeno Enrique España-Gregori Andres Gene-Sampedro juan carlos Ondategui-Parra carlos J.Zapata-rodriguez Department of Optics and Optometry and Vision Science University of Valencia Spain Department of Surgery University of Valencia University Hospital La FeSpain Faculty of Optics and Optometry University Vision Centre Polytechnic University of CataloniaSpain

Purpose:The aim of this paper was to examine the distribution of macular,retinal nerve fiber layer(RNFL)thickness and optic disc parameters of myopic and hyperopic eyes in comparison withemmetropic control eyes and to investigate their variation according to axial length(AL)andspherical equivalent(SE)in healthy ***:This study included 293 pairs of eyes of 293children(145 boys and 148 girks),ranging in age from 6 to 17 years,Subjects were dividedaccording to SE in control(emmetropia,99 children),myopia(100 children)and hyperopia(94children)groups and according to axial AL in 68 short(25.00 mm,36).Macular parameters,RNFL thickness and opticdisc morphology were assessed by the Cirrus^(TM) *** was measured using the ***'s formula was used for calculating the corrected AL-related ocular *** Mean age(±SD)was 10.84±3.05 years;mean(±SD)SE was+0.14±0.51 D(range from8.75 to+8.25 D)and mean AL(±SD)was 23.12±*** RNFL thickness,averagemacular thickness and macular volume decreased as AL and myopia *** correlationsbetween AL/SE and optic disc parameters were found after correcting for magnification ***:AL and refractive error affect measurements of macular and RNFL thickness inhealthy *** make a correct interpretation of ocT measurements,ocular magnificationeffect should be taken into account by clinicians or OCT manufacturers.

关键词： Axial length refractive error children OCT measurements magnification fect

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Bigger or long-winged male common crossbills exhibit redder carotenoid-based plumage coloration

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Current Zoology 2023年第2期69卷 165-172页

作者： Blanca Fernandez-Eslava Daniel Alonso David Galicia juan Arizaga carlos Alonso-Alvarez Biologia Ambiental Universidad de NavarraFacultad de CienciasC/Irunlarrea1 Pamplona31008 NavarraSpain Ornitologia Sociedad de Ciencias de AranzadiZorroagagaina 1120014 DonostiaSan SebastianSpain Ecologia Evolutiva Museo Nacional de Ciencias Naturales(CSiC)Edificio Pinar 2528006 MadridSpain

Carotenoid-based ornaments are often considered reliable(honest)individual condition signals because their expression implies physiological costs unaffordable for low-quality animals(handicap signals).Recently,it has been suggested that efficient cell respiration is mandatory for producing red ketocarotenoids from dietary yellow *** implies that red colorations should be entirely unfalsifiable and independent of expression costs(index signals).In a precedent study,male common crossbills,Loxia curvirostra,showing a red plumage reported higher apparent survival than those showing yellowish-orange *** plumage redness in this species is due to ketocarotenoid accumulation in ***,we correlated the male plumage redness(a 4-level visual score:yellow,patchy,orange,and red)and the body morphology in more than 1,ooo adult crossbills captured in 3 Iberian localities to infer the mechanisms responsible for color evolution.A principal component analysis summarized morphometry of 10 variables(beak,wing,tarsus length,etc.).The overall body size(PC1)and the length of flight feathers regarding body size(Pc3)showed significant positive relationships with plumage *** redness was barely correlated with bill shape measures,suggesting no constraint in acquiring carotenoids from pine ***,large body sizes or proportionally long flying feathers could help carotenoid acquisition via social competition or increased foraging *** longer flight feathers might also be associated with a specific cell respiration profile that would simultaneously favor flying capacities and enzymatic transformations needed for ketocarotenoid *** a phenotypic profile would agree with the hypothesis of ketocarotenoid-based colors acting as individual quality index signals.

关键词： avian carotenoids color and biometrics Loxia genus Mediterranean crossbills resource allocation trade-offs shared pathway hypothesis

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Overview of the anterolateral complex of the knee

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World Journal of Clinical Cases 2022年第24期10卷 8474-8481页

作者： Ignacio Garcia-Mansilla juan Pablo Zicaro Ezequiel Fernando Martinez juan Astoul carlos Yacuzzi MatiasCosta-Paz Knee Surgery Hospital Italiano de Buenos AiresBuenos Aires 1199Argentina

In the last few years,much more information on the anterolateral complex of the knee has become *** has now been demonstrated how it works in conjunction with the anterior cruciate ligament(ACL)controlling anterolateral rotatory *** studies have shown that the anterolateral complex(ALC)has a role as a secondary stabilizer to the ACL in opposing anterior tibial translation and internal tibial *** is of utmost importance that surgeons comprehend the intricate anatomy of the entire anterolateral aspect of the *** most studies have only focused on the anterolateral ligament(ALL),the ALC of the knee consists of a functional unit formed by the layers of the iliotibial band combined with the anterolateral joint *** interest has also been given to imaging evaluation using magnetic resonance and several studies have targeted the evaluation of the ALC in the setting of ACL *** are inconsistent with a lack of association between magnetic resonance imaging evidence of injury and clinical *** ACL reconstruction may not always reestablish knee rotatory stability in patients with associated ALC *** such cases,additional procedures,such as anterolateral reconstruction or lateral tenodesis,may be *** are several techniques available for ALL *** options include the iliotibial band,gracilis or semitendinosus tendon autograft,or allograft.

关键词： Anterolateral complex Knee instability Anterolateral ligament Anterior cruciate ligament reconstruction

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Interpenetrated Chitosan-Poly(Acrylic Acid-Co-Acrylamide) Hydrogels. Synthesis, Characterization and Sustained Protein Release Studies

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Materials Sciences and Applications 2011年第6期2卷 509-520页

作者： Michel Bocourt Povea Waldo Argüelles Monal juan Valerio Cauich-rodríguez Alejando May Pat Nancy Badas Rivero carlos Peniche Covas 不详

Interpenetrated polymer networks of chitosan (CHI), polyacrylic acid (PAA) and polyacrylamide (PAM) were prepared by free radical polymerization. These hydrogels were either washed with double distilled water (CHI/PAA/PAM) A or hydrolyzed with 1M sodium hydroxide (NaOH), (CHI/PAA/PAM) S. Both types of hydrogels were characterized by infrared spectroscopy, microstructural techniques and compressive mechanical testing. Finally, hydrogels were loaded with bovine serum albumin (BSA) and release followed at different pHs. Infrared spectra analysis showed correspondence between hydrogels and monomer feed compositions. Hydrolyzed hydrogels, had increased water content and pH swelling dependence. Compression modulus of swelled hydrolyzed hydrogels decreased with increasing equilibrium water content. Higher BSA loadings were achieved on hydrolyzed hydrogels due to their high water content and porosity. Protein release from hydrogels was low (≤ 20% after 10 hours) at pH 1.2, but sustained release was observed at pH 6.8 and 7.4. The integrity of the protein released at 6.8 and 7.4 by hydrolyzed hydrogels was unaffected. The hydrogles showed no cytotoxic effects on human skin dermal fibroblasts as determined by MTT assay except for two compositions of (CHI/PAA/PAM) A samples, which after seven days presented a viability lower than 80% respect to the control.

关键词： Hydrogels Controlled Release Protein Polyacrylamide Interpenetrated Polymer

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Commuting Structure Jacobi Operator for Real Hypersurfaces in Complex Two-plane Grassmannians

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Acta Mathematica Sinica,English Series 2015年第1期31卷 111-122页

作者： carlos J.G.MACHADO juan de Dios PREZ Young Jin SUH Departamento de Geometria y Topologia Universidad de Granada Kyungpook National University Department of Mathematics

We classify real hypersurfaces in complex two-plane Grassmannians whose structure Jacobi operator commutes either with any other Jacobi operator or with the normal Jacobi operator.

关键词： Real hypersurfaces complex two-plane Grassmannians structure Jacobi operator normal Jacobi operator

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