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HVOF-sprayed HAp/S53p4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants

Journal of Magnesium and Alloys 2024年第1期12卷 345-360页

作者： Carlos A.poblano-Salas John Henao Astrid l.Giraldo-Betancur paola Forero-Sossa Diego German Espinosa-Arbelaez Jorge A.González-Sánchez l.is r.dzib-pérez Susana T.Estrada-Moo Idelfonso E.pech-pech CIATEQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-CIATEQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-Cinvestav Libramiento Norponiente#2000.Fraccionamiento Real de JuriquillaQuerétaro 76230Mexico Universidad Tecnológica de Querétaro Av.Pie de la Cuesta N°2501Querétaro 76148Mexico CIDESI Av.Playa Pie de la Cuesta No 702Col.San PabloQuerétaro 76125Mexico Center for Corrosion research Autonomous University of CampecheAv.Héroe de Nacozari No.480P.C.24070San Francisco de CampecheCam.Mexico

Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro *** the present work,75%***-25%wt.S53p4 bioactive glass powders were HVOF-sprayed to obtain HAp/S53p4 BG composite coatings on a bioresorbable AZ31 *** study is focused on exploring the effect of the stand-off distance and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those *** characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite *** results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal *** was also found that both spraying distance and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the *** addition,in-vitro electrochemical studies were performed on the obtained HAp/S53p4 BG composite coatings and compared against the uncoated AZ31 *** results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(SBF).

关键词： Coatings Composites Thermal spray Temporary implants Hydrogen evolution

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Effect of electromagnetic interaction on microstructure and corrosion resistance of 7075 aluminium alloy during modified indirect electric arc welding process

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Transactions of Nonferrous Metals Society of China 2019年第3期29卷 473-484页

作者： J. S. rEYNA-MONTOYA M. A. GArCIA-rENTErIA V. l. CrUZ-HErNANDEZ F. F. CUrIEl-lOpEZ l. r. dzib-pErez l. A. FAlCON-FrANCO Faculty of Metallurgy Autonomous University of CoahuilaCarretera 57 Km. 5 CP 25720 Monclova Coahuila México Instituto de Investigación en Metalurgia y Materiales Universidad Michoacana de San Nicolás de Hidalgo A. P. 888 CP 58030 Morelia Michoacán México Centre for Corrosion research Autonomous University of CampecheAv. Agustín Melgar s/n Col. Buenavista CP 24039 Campeche Cam México

The effects of applying an electromagnetic interaction of low intensity (EMIlI) on the microstructure and corrosion resistance of 7075-T651 Al alloy plates (13 mm in thickness) during modified indirect electric arc (MIEA) welding were investigated. The welding process was conducted in a single pass with a heat input of ~1.5 kJ/mm. The microstructural observations of the welds were correlated with the effect of EMIlI on the local mechanical properties and the corrosion resistance in natural seawater by means of microhardness measurements and electrochemical impedance spectroscopy, respectively. Microstructural characterization of the welds revealed a grain refinement in the weld metal due to the electromagnetic stirring induced by EMIlI of 3 mT during welding. In addition, observations in the scanning electron microscope showed that the precipitation of Cu-rich phases and segregation of eutectics were reduced in the heat affected zone (HAZ) also as an effect of EMIlI. The high corrosion dissolution of the 7075-T651 welds in natural seawater and the extent of overaging in the HAZ were reduced when welding with EMIlI of 3 mT. Thus, EMIlI along with the MIEA technique may lead to welded joints with better microstructural characteristics, improved mechanical properties in the HAZ and reduced electrochemical activity.

关键词： 7075-T651 Al alloy modified indirect arc welding microstructural characterization corrosion resistance electromagnetic interaction

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CDS:A Fold-change Based Statistical Test for Concomitant Identification of Distinctness and Similarity in Gene Expression Analysis

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Genomics,proteomics & Bioinformatics 2012年第3期10卷 127-135页

作者： Nicolas Tchitchek José Felipe Golib dzib Brice Targat Sebastian Noth Arndt Benecke Annick lesne Institut des Hautes Etudes Scientifiques Bures-sur-Yvette 91440France Centre National de la recherche Scientifique USR3078Bures-sur-Yvette 91440France laboratoire de physique Théorique de la Matière Condensée CNRS UMR7600Université Pierre et Marie Curie-Paris 6Paris 75005France

The problem of identifying differential activity such as in gene expression is a major defeat in biostatistics and *** important,however much less frequently studied,is the question of similar activity from one biological condition to *** foldchange,or ratio,is usually considered a relevant criterion for stating difference and similarity between ***,no statistical method for concomitant evaluation of similarity and distinctness currently exists for biological *** microarray,digital pCr(dpCr),and Next-Generation Sequencing(NGS) technologies frequently provide a means of coefficient of variation estimation for individual *** fold-change,and by making the assumption that measurements are normally distributed with known variances,we designed a novel statistical test that allows us to detect concomitantly,thus using the same formalism,differentially and similarly expressed genes(http://***).Given two sets of gene measurements in different biological conditions,the probabilities of making type I and type II errors in stating that a gene is differentially or similarly expressed from one condition to the other can be ***,a confidence interval for the fold-change can be ***,we demonstrate that the assumption of normality can be relaxed to consider arbitrary distributions *** Concomitant evaluation of Distinctness and Similarity(CDS) statistical test correctly estimates similarities and differences between measurements of gene *** implementation,being time and memory efficient,allows the use of the CDS test in high-throughput data analysis such as microarray,dpCr,and NGS ***,the CDS test can be applied to the comparison of single measurements(N:1) provided the variance(or coefficient of variation) of the signals is known,making CDS a valuable tool also in biomedical analysis where typically a single measurement per

关键词： Statistical test Fold-change Distinctness Similarity Gene expression Single measurement patient study

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