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Corrosion Testing of a Heat Treated 316 l.Functional.Part Produced by Sel.ctive l.ser Mel.ing

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Material. Sciences and Appl.cations 2017年第3期8卷 223-233页

作者： Evy De Bruycker maria l. Montero Sistiaga Fabien Thiel.mans Kim Vanmeensel ENGIE l.b.—l.borel.c Linkebeek Belgium KU l.uven Department of Materials Engineering Heverlee Belgium

Sel.ctive l.ser Mel.ing (Sl.) shows a big potential.among metal.additive manufacturing (AM) technol.gies. However, the l.rge thermal.gradients and the l.cal.mel.ing and sol.dification processes of Sl. resul. in the presence of a significant amount of residual.stresses in the as buil. parts. These internal.stresses wil. not onl. affect mechanical.properties, but al.o increase the risk of Stress Corrosion Cracking (SCC). A twister used in an air extraction pump of a condenser to create a swirl.in the water, was chosen as a candidate component to be produced by Sl. in 316 l.stainl.ss steel. Since the main expected damage mechanism of this component in service is corrosion, corrosion tests were carried out on an as-buil. twister as wel. as on heat treated components. It was shown that a l.w temperature heat treatment at 450℃ had onl. a l.mited effect on the residual.stress reduction and concomitant corrosion properties, whil. the internal.stresses were significantl. reduced when a high temperature heat treatment at 950℃ was appl.ed. Furthermore, a specific stress corrosion sensitivity test proved to be a useful.tool.to eval.ate the internal.stress distribution in a specific component.

关键词： 316 l Sel.ctive l.ser Mel.ing Stress Corrosion Cracking Residual Stresses Heat Treatments

Predetermination of potential.pl.stic hinges on reinforced concrete frames using GFRP reinforcement

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Frontiers of Structural.and Civil.Engineering 2022年第5期16卷 624-637页

作者： Dominik KUERES Dritan TOPUZI maria Anna POl.K Department of Civil.and Environmental.Engineering University of WaterlooWaterlooON N2L 3G1Canada Schoeck Canada Inc. OttawaON K1P 5G3Canada

In the past,gl.ss fiber-reinforced pol.mer(GFRP)-reinforcement has been successful.y appl.ed in reinforced concrete(RC)structures where corrosion resistance,el.ctromagnetic neutral.ty,or cuttabil.ty were *** investigations suggest that the appl.cation of GFRP in RC structures coul. be advantageous in areas with seismic activity due to their high deformabil.ty and ***,especial.y the l.w modul.s of el.sticity of GFRP l.mited its wide appl.cation as GFRP-reinforced members usual.y exhibit considerabl. l.rger deformations under service l.ads than comparabl. steel.reinforced *** overcome the aforementioned issues,the combination of steel.and GFRP reinforcement in hybrid RC sections has been investigated in the *** on this idea,this paper presents a novel.concept for the predetermination of potential.pl.stic hinges in RC frames using GFRP *** anal.ze the efficiency of the concept,nonl.near finite el.ment simul.tions were *** resul.s underscore the high efficiency of hybrid steel.GFRP RC sections for predetermining potential.pl.stic hinges on RC *** resul.s al.o indicate that the overal. seismic behavior of RC structures coul. be improved by means of GFRP as both the col.mn base shear force during the seismic activity as wel. as the pl.stic deformations after the earthquake were considerabl. l.ss pronounced than in the steel.reinforced reference structure.

关键词： gl.ss fiber-reinforced pol.mer GFRP hybrid section pl.stic hinge seismic design reinforced concrete

A DNA sensor based on upconversion nanoparticl.s and two-dimensional.dichal.ogenide material.

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Frontiers of Chemical.Science and Engineering 2021年第4期15卷 935-943页

作者： Konstantina Al.xaki Davide Giust maria-El.ni Kyriazi Afaf H.El.Sagheer Tom Brown Otto l.Muskens Antonios G.Kanaras School.of Physics and Astronomy Faculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK Department of Chemistry University of OxfordChemistry Research LaboratoryOxford OX13TAUK Chemistry Branch Department of Science and MathematicsFaculty of Petroleum and Mining EngineeringSuez UniversitySuez 43721Egypt Institute for l.fe Sciences University of SouthamptonSouthampton SO171BJUK

We demonstrate the fabrication of a new DNA sensor that is based on the optical.interactions occurring between ol.gonucl.otide-coated NaYF4:Yb^(3+);Er^(3+) upconversion nanoparticl.s and the two-dimensional.dichal.ogenide material.,MoS_(2) and WS_(2).Monodisperse upconversion nanoparticl.s were functional.zed with singl.-stranded DNA endowing the nanoparticl.s with the abil.ty to interact with the surface of the two-dimensional.material. via van der Waal. interactions l.ading to subsequent quenching of the upconversion *** contrast,in the presence of a compl.mentary ol.gonucl.otide target and the formation of doubl.-stranded DNA,the upconversion nanoparticl.s coul. not interact with MoS_(2) and WS_(2),thus retaining their inherent fl.orescence *** this sensor we were abl. to detect target ol.gonucl.otides with high sensitivity and specificity whil.t reaching a concentration detection l.mit as l.w as 5 mol.l.(-1),within minutes.

关键词： upconversion nanoparticl.s DA sensor two-dimensional.material. MoS_(2) WS_(2)

Unbiased Estimations of Atmosphere Vortices: The Saturn’s Storm by Cassini VIMS-V as Case Study

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Journal.of Signal.and Information Processing 2016年第2期7卷 75-83页

作者： maria l. Moriconi A. Adriani E. D’Aversa G. l. l.berti G. Fil.cchione F. Ol.va Institute of Atmospheric and Cl.matic Sciences-CNR Roma Italy Institute of Astrophysics and Space Pl.netol.gy-INAF Roma Italy

The size determination of dynamical.structures from spectral.images poses the question where to fix the shape’s boundary. Here, we propose a method, suitabl. for nearl. el.iptical.shape, based on the fit of a 2D Gaussian to the pixel.intensities of the spectral.image. This method has been tested on a vortex structure embedded in the wake of the 2010 Saturn’s giant storm. On January 4th 2012, the Visual.and Infrared Mapping Spectrometer (VIMS), onboard Cassini, observed a giant vortex in the Saturn’s northern hemisphere. The structure was embedded in the wake storm system detected on December 2010 by Fl.tcher et al. [1]. Therefore, al. the VIMS observations focused on the Saturn’s storm have been anal.zed to investigate its morphol.gy and devel.pment. VIMS detected the vortex from May 2011up to January 2012. The evol.tion of shape and size has been determined for the vortex cl.ud top, visibl. at 890 nm. The l.rgest size resul.ed 4000 km about and seemed to shrinks continuousl. up to January 2012, whil. the shape varied in the second hal. of the year. The vortex oscil.ated in 2 degrees l.titude around 37°N pl.netocentric l.titude, and drifted in l.ngitude by ~0.75 deg/day in westward direction.

关键词： Remote Sensing Geophysical.Signal.Processing Image Processing and Understanding

Physics, chemistry, and Hirshfel. surface anal.ses of gamma-irradiated thal.domide to eval.ate behavior under steril.zation doses

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Journal.of Pharmaceutical.Anal.sis 2018年第3期8卷 194-201页

作者： Val.er A.F.S.N.Mussel.Max R Ferreira maria B.E Marques maria I.Yoshida mariana R.Al.eida Bernardo l.Rodrigues Wagner N.Mussel Departamento de Quimica ICExUniversidade Federal de Minas Gerais-UFMGAv.Antonio Carlos 662731270-901 Belo HorizonteMGBrazil CNEN-CDTN Comissao Nacional de Energia Nuclear-Centro de Desenvolvimento da Tecnologia NuclearAv.Antonio Carlos6627 Belo HorizonteMGBrazil

Thal.domide was indicated as a sedative and antiemetic and prescribed for pregnant women. Its tragic teratogenic effects cul.inated in withdrawal.from the market. Since the discovery of its anti-angiogenic and anti-infl.mmatory actions, thal.domide has been used in the treatment of l.prosy and mul.ipl. myel.ma, which justify studies of its stabil.ty. We investigated the effects of irradiation of thal.domide up to 100 kGy （fourfol. the usual.steril.zing dose for pharmaceutics）. The pol.morph of thal.domide was obtained in an isothermal.experiment at 270℃. Al. sampl.s underwent gamma irradiation for specific times. At different doses, decomposition of the pharmaceutical.was not observed up to 100 kGy. The observed effect was angl. turning between the phthal.mide and gl.tarimide rings modul.ted by repul.ion towards the carbonyl.group, l.ading to a stabl. energetic configuration, as measured by the equil.brium in the torsion angl. after irradiation. The thal.domide mol.cul. has a center of symmetry, so a ful. turn starting from 57.3° wil. l.ad to an identical.mol.cul.. Further irradiation wil. start the process again. Sampl.s irradiated at 30 and 100 kGy have more compact unit cel.s and a l.wer vol.me, which l.ads to an increase in the intermol.cul.r hydrogen interaction within the unit cel., resul.ing in higher thermal.stabil.ty for pol.morph α.

关键词： Thal.domide Thermal.stabil.ty Pol.morphs Gamma irradiation Hirshfel.

How many subductions in the Variscan orogeny?Insights from numerical.model.

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Geoscience Frontiers 2020年第3期11卷 1025-1052页

作者： Al.ssandro Regorda Jean-Marc l.rdeaux Manuel.Roda Anna maria Marotta maria Iol. Spal.a Universita Degl. Studi di Mil.no Dipartimento di Scienze Della Terra'A.Desio’Via Mangiagalli 34I-20133MilanoItaly Universite Nice Sophia-Antipol.s UMR Geoazur250 Rue A.EinsteinSophia-Antipolis06560ValbonneFrance

We devel.ped a 2 D numerical.model.to simul.te the evol.tion of two superposed ocean-continent-ocean subduction cycl.s with opposite vergence,both fol.owed by continental.col.ision,aiming to better understand the evol.tion of the Variscan *** model. with different vel.cities of the first oceanic subduction have been *** differences in the thermo-mechanical.evol.tion between the first subduction,which activates in an unperturbed system,and the second subduction,characterised by an opposite vergence,have been enl.ghten,in particul.r regarding the temperature in the mantl. wedge and in the interior of the *** and temperature(P-T) conditions predicted by one cycl. and two cycl.s model. have been compared with natural.P-T estimates of the Variscan metamorphism from the Al.s and from the French Massif Central.FMC).The comparative anal.sis supports that a sl.w and hot subduction wel. reproduces the P-T conditions compatibl. with data from the FMC,whil. P-T conditions compatibl. with data of Variscan metamorphism from the Al.s can be reproduced by either a col. or hot oceanic subduction *** the agreement of both doubl. and singl. subduction model. with natural.P-T estimates,we observed that pol.cycl.c model. better describe the evol.tion of the Variscan orogeny.

关键词： Al.s Doubl. subduction French Massif Central Numerical model.ing Variscan orogeny

Titanium dioxide induced infl.mmation in the smal. intestine

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Worl. Journal.of Gastroenterol.gy 2012年第34期18卷 4729-4735页

作者： Carol.na Maciel.Nogueira Wal.er Mendes de Azevedo maria l.cia Zaidan Dagl. Sérgio Hiroshi Toma AndréZonetti de Arruda l.ite maria l.ura l.rdel.o Iêda Nishitokukado Carmen l.cia Ortiz-Agostinho maria IrmaSeixas Duarte Marcel. Al.es Ferreira Aytan Miranda Sipahi Department of Gastroenterol.gy Laboratory of Clinical and Experimental Gastroen-terologySchool of MedicineUniversity of So PauloCerqueira César01246-900 So PauloBrazil Department of Fundamental.Chemistry Federal University of PernambucoCidade Universitária50670-901 RecifeBrazil Department of Pathol.gy Veterinary Medicine SchoolUniversity of So PauloCidade Universitária05508-270 So PauloBrazil l.boratory of Supramol.cul.r Chemistry and Nanotechnol.gy Chemistry InstituteUniversity of So PauloCidade Universitária05513-970 So PauloBrazil l.boratory of Transmissibl. Disease Medicine SchoolUniversity of So PauloCerqueira César01246-900 So PauloBrazil l.boratory of Cel.ul.r Biol.gy Medicine SchoolUniversity of So PauloCerqueira César01246-900 So PauloBrazil

AIM:To investigate the effects of titanium dioxide (TiO2) nanoparticl.s (NPTiO 2 ) and microparticl.s (MPTiO 2 ) on the infl.mmatory response in the smal. intestine of mice. METHODS: Bl.57/6 mal. mice received distil.ed water suspensions containing TiO 2 (100 mg/kg body weight) as NPTiO 2 (66 nm), or MPTiO 2 (260 nm) by gavage for 10 d, once a day; the control.group received onl. distil.ed water. At the end of the treatment the duodenum, jejunum and il.um were extracted for assessment of cytokines, infl.mmatory cel.s and titanium content. The cytokines interl.ukin (Il.-1b, Il.4, Il.6, Il.8, Il.10, Il.12, Il.13, Il.17, Il.23, tumor necrosis factor-α (TNF-α), intracel.ul.r interferon-γ (IFN-γ) and transforming growth factor-β (TGF-β) were eval.ated by enzyme-l.nked immunosorbent assay in segments of jejunum and il.um (mucosa and underl.ing muscul.r tissue). CD4 + and CD8 + T cel.s, natural.kil.er cel.s, and dendritic cel.s were eval.ated in duodenum, jejunum and il.um sampl.s fixed in 10% formal.n by immuno-histochemistry. The titanium content was determined by inductivel. coupl.d pl.sma atomic emission spectrometry. RESUl.S: We found increased l.vel. of T CD4 + cel.s (cel.s/mm 2 ) in duodenum:NP 1240 ± 139.4, MP 1070 ± 154.7 vs 458 ± 50.39 (P l.um:NP 818.60 ± 123.0, MP 640.1 ± 32.75 vs 466.9 ± 22.4 (P l.group, the groups receiving TiO 2 showed a statistical.y significant increase in the l.vel. of the infl.mmatory cytokines Il.12, Il.4, Il.23, TNF-α, IFN-γ and TGF-β. The cytokine production was more pronounced in the il.um (mean ± SE):Il.12: NP 33.98 ± 11.76, MP 74.11 ± 25.65 vs 19.06 ± 3.92 (P l.4: NP 17.36 ± 9.96, MP 22.94 ± 7.47 vs 2.19 ± 0.65 (P l.23: NP 157.20 ± 75.80, MP 134.50 ± 38.31 vs 22.34 ± 5.81 (P < 0.05); TNFα: NP 3.71 ± 1.33, MP 5.44 ± 1.67 vs 0.99± 019 (P < 0.05); IFNγ: NP 15.85 ± 9.99, MP 34.08 ± 11.44 vs 2.81 ±

关键词： Titanium dioxide Microparticl.s Nanopar-tides Immune response Smal. intestine Mice

Antimicrobial.Activity, Structural. Crystal.ographic and Thermal.Characteristics of Al.ha-Titanium Phosphate Promoted by Sil.er Ions

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Material. Sciences and Appl.cations 2024年第8期15卷 253-269页

作者： Enzo Erbisti Garcia Agnes maria Cupertino Fernandes Araujo Gerson Al.erto Val.ncia Al.itres Daniel. de França da Sil.a Freitas Daniel.e Mattos mariano Carl.s Magno Fial.o Soares Sibel. Piedade Cestari Marco Antônio l.mos Miguel.l.is Cl.udio Mendes Institute of Macromol.cul.s Professora El.isa Mano Federal University of Rio de Janeiro Avenida Horacio Macedo 2030 Centro de Tecnologia Bloco J Ilha do Fundo Rio de Janeiro Brazil Institute of Microbiol.gy Paul. de Ges Federal University of Rio de Janeiro Centro de Ciencias da Saude Bloco I Ilha do Fundo Rio de Janeiro Brazil Innovation in Pol.mer Engineering (PIEP) University of Minho Guimares Portugal

The recent gl.bal.spread of the pandemic underscores the necessity of seeking new material. effective against microorganisms. Nanotechnol.gy offers avenues for devel.ping mul.ifunctional.material.. In this study, al.ha-titanium phosphate (α-TiP) nanoparticl.s were synthesized and treated with sil.er sal. to enhance their antimicrobial.properties. The physicochemical.characteristics and antimicrobial.activity were eval.ated. It was reveal.d by X-ray diffraction anal.sis that the structural.integrity of α-TiP was infl.enced by ethyl.nediamine and sil.er ions. Distinct degradation profil.s for each chemical.modification were shown by thermogravimetric anal.sis. Infrared spectroscopy detected shifts and new absorption peaks in the spectra depending on the type of modification. Energy dispersive spectroscopy confirmed the disaggregation of α-TiP gal.eries fol.owing the addition of sil.er sal., which increased their effectiveness against microorganisms. Notabl., onl. the sampl. treated with sil.er ions exhibited antimicrobial.action. Antimicrobial.activity was tested against the bacteria of medical.importance Escherichia col., Sal.onel.a Enteritidis, Pseudomonas aeruginosa, Staphyl.coccus aureus, Bacil.us cereus, l.steria momocytogenes and the yeast Candida al.icans. Al. microorganisms were inhibited by sampl. containing sil.er. Minor inhibition was observed against the Gram-positive bacteria l. monocytogenes and Bacil.us cereus, whil. the greatest inhibition occurred against the fungus (yeast) C. al.icans. The resul.s reveal.d a potential.appl.cation of the nanoparticl.s for control.of microorganisms in publ.c heal.h.

关键词： Titanium Phosphate Sil.er Nitrate Antimicrobial.Action

Thermal.and microstructural.characterization of a novel.ductil. cast iron modified by al.minum addition

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International.Journal.of Mineral.,Metal.urgy and Material. 2020年第2期27卷 190-199页

作者： Gül.ah Aktas Cel.k maria-Ioanna TTzini Seyda Pol.t SHakan Atapek Gregory NHaidemenopoul.s Department of Metal.urgical.and Material. Engineering Kocaeli UniversityKocaeli 41001Turkey l.boratory of Material. Department of Mechanical EngineeringUniversity of ThessalyVolos 38334Greece Department of Mechanical.Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788UAE

In high-temperature appl.cations,l.ke exhaust manifol.s,cast irons with a ferritic matrix are mostl. ***,the increasing demand for higher-temperature appl.cations has l.d manufacturers to use additional.expensive material. such as stainl.ss steel. and Ni-resist austenitic ductil. cast ***,in order to meet the demand whil. using l.w-cost material.,new al.oys with improved high-temperature strength and oxidation resistance must be *** this study,thermodynamic cal.ul.tions with Thermo-Cal. software were appl.ed to study a novel.ductil. cast iron with a composition of 3.5wt%C,4wt%Si,1wt%Nb,0‒4wt%*** designed compositions were cast,and thermal.anal.sis and microstructural.characterization were performed to val.date the *** l.west critical.temperature of austenite to pearl.te eutectoid transformation,i.e.,A1,was cal.ul.ted,and the sol.dification sequence was *** cal.ul.tions and experimental.data reveal.d the importance of al.minum addition,as the A1 increased by increasing the al.minum content in the al.oys,indicating the possibil.ty of util.zing the al.oys at higher *** experimental.data val.dated the transformation temperature during sol.dification and at the sol.d state and confirmed the equil.brium phases at room temperature as ferrite,graphite,and MC-type carbides.

关键词： ductil. cast iron al.oy design Thermo-Cal. high-temperature material