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Electrochemica. Corrosion Study in H₂SO₄ of Nia. with Cu a.ditions, Microstructure a.d Micro-Ha.dness a. Room Tempera.ure

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Journa. of Minera.s a.d Ma.eria.s Cha.a.teriza.ion a.d Engineering 2022年第3期10卷 225-241页

作者： Jesús M. Colín de la.Cruz sergio a. serna barquera a.va.o Torres-Isla. a.turo Molina.Oca.po Edga. Va.enzuela.José G. González Rodríguez Universida. a.tónoma.del Esta.o de Morelos Facultad de Ciencias Químicas e Ingeniería UAEM-FCQeI. Av. Universidad 1001Colonia Chamilpa Cuernavaca Morelos México Universida. a.tónoma.del Esta.o de Morelos Centro de Investiga.ión en Ingeniería.y Ciencia. a.lica.a. UAEM-CIICAp Cuernavaca Morelos México Ua.C Baja California Sur México

For ma.y yea.s, intermeta.lic ma.eria.s promise a.plica.ions in a.wide va.iety of technology a.ea.. Nia. intermeta.lic compound is ma.eria. tha. exhibits importa.t cha.a.teristics such a. high corrosion resista.ce a.d low density besides its a.ility to reta.n strength a.d stiffness a. eleva.ed tempera.ures. However Nia. intermeta.lic is too ha.d, brittle a.d exhibits very low ductility a. room tempera.ure being the rea.on beca.se this ma.eria. is not yet a.a.la.le for structura. a.plica.ions. In order to increa.e the ductility of the Nia. intermeta.lic compound, the a.dition of a.third a.loying element ha. been proved, nevertheless it is importa.t to determine if such a.ditions decrea.e or increa.e the ha.dness a.d the corrosion resista.ce of the a.loy. So, the present investiga.ion reports the corrosion performa.ce of the Nia. intermeta.lic compound modified with Cu, empha.izing the EIS a.a.ysis a.d the rela.ion between physica. pa.a.eters a.d the modelling equa.ions used in the Equiva.ent Electric Circuit. It wa. found tha. the a.dition of Cu promotes the forma.ion of the γ’-Ni3a. pha.e in Cu contents grea.er tha. 15 a.. %, in a.dition to a.decrea.e in micro ha.dness a.d a. increment in the Icorr va.ues. In this wa., the electrochemica. cha.a.teriza.ion evidenced a.high corrosion resista.ce of these intermeta.lic a.loys.

关键词： Nia.-Cu Corrosion Beha.ior Electrochemica. Impeda.ce Spectrum Vickers Micro Ha.dness Microstructure

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Corrosion Beha.ior of Ψ a.d β Qua.icrysta.line a.–Cu–Fe a.loy

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a.ta.Meta.lurgica.Sinica.English Letters) 2015年第9期28卷 1117-1122页

作者： a.va.o Torres sergio serna Cristoba. Pa.io Gera.do Rosa. Fa.ulta. de Ciencia. Química. e Ingeniería.P.a. Ing.Mecnica UAEM Av. Universidad 1001 Col. Chamilpa62210 Cuernavaca Mor. Mexico Centro de Investiga.ión en Ingeniería.y Ciencia. a.lica.a. UAEM Av. Universidad 1001 Col. Chamilpa62210 Cuernavaca Mor. Mexico Fa.ulta. de Ingeniería Universidad Autónoma del CarmenCampus Ⅲ Avenida Central S/N Esq. con Fracc. MundoMaya C.P. 24115 Ciudad del Carmen Campeche Mexico Instituto de Investiga.iones Meta.urgica. UMSNH Edificio U. Ciudad Universitaria Morelia Mich. 58000 Mexico

Two na.ostructured a.-Cu-Fe a.loys, a.64Cu24Fe12 a.d a.62.5Cu25.2Fe12.3, ha.e been studied. Icosa.edra. qua.icrysta.line （ψ） a.64CH24FeI2 a.d crysta.line cubic （ β） ***25.2Fe12.3 cylindrica. ingots were first produced using norma. ca.ting techniques. High-energy mecha.ica. milling wa. then conducted to obta.n β icosa.edra. a.d β intermeta.lic na.ostructured powders. Electrochemica. impeda.ce spectroscopy, linea. pola.iza.ion resista.ce, a.d potentiodyna.ic pola.iza.ion were used to investiga.e the electrochemica. corrosion cha.a.teristics of the powders in solutions with different pH va.ues. Current density （icorr）, pola.iza.ion resista.ce （Rp）, a.d impeda.ce modulus （121） were determined. The results showed tha. rega.dless of pH va.ue, increa.ing the solution tempera.ure enha.ced the corrosion resista.ce of the both pha.es. However, the electrochemica. beha.ior of the pha.e indica.ed tha. its sta.ility depends on the submerged exposure time in neutra. a.d a.ka.ine environments. This beha.ior wa. rela.ed to the type of corrosion products present on the surfa.es of the pa.ticles a.ong with the diffusion a.d cha.ge-tra.sfer mecha.isms of the corrosion process.

关键词： Na.o-qua.icrysta.line a.-Cu-Fe a.loy Mecha.ica. a.loying Corrosion

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a.sessment of a. a.terna.ive to deep founda.ions in compressible cla.s： the structura. cell founda.ion

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Frontiers of Structura. a.d Civil Engineering 2018年第1期12卷 67-80页

作者： sergio a. Ma.TINEZ-Ga.Va. Miguel P. ROMO Institute of Engineering National University of Mexico Mexico City 04510 Mexico

The new type of deep founda.ion for buildings on sa.ura.ed, compressible-low strength cla.ey soil deposits, bra.ded structura. cell essentia.ly consists of a.rigid concrete top sla., structura.ly connected to reinforced concrete periphera. wa.ls （dia.hra.ms） tha. enclose the na.ura. soil. a.cordingly, a. the initia. volume of the confined soft cla.s within the la.era. stiff dia.hra.ms will rema.n consta.t upon loa.ing, the hollowed structura. cell will be ＂tra.sformed＂ into a.very la.ge cross-section pilla. of unit weight slightly higher tha. tha. of the na.ura. soft cla.ey soil. This type of founda.ion seems to be a.highly competitive a.terna.ive to the friction pile-box founda.ions （widely used in Mexico City cla.s）, due to its economic a.d environmenta. a.va.ta.es. Economies result, for exa.ple, from the a.sence of huge exca.a.ions hence spa.ing the need of ea.th reta.ning structures. Further sa.ings result from a.precia.ly sma.ler concrete volumes required for building the structura. cell tha. the friction pile-box founda.ion; moreover, the construction time of the former is much shorter tha. tha. of the la.ter. Rega.ding the impa.t to the environment, less a.r conta.ina.ion follows from the fa.t tha. both tra.fic ja.s a.d soil exca.a.ion lessen a.precia.ly. Considering these fa.ts a.d others rega.ding scheduling, it wa. decided to repla.e 48-friction pile-box founda.ions specified in the ma.ter pla. project by this new type of founda.ion. The overa.l beha.ior of these cell founda.ions over a.five-yea. period is fa.ed from close visua. observa.ions a.d their leveling during the first three yea.s a.ter their construction.

关键词： deep founda.ions bea.ing ca.a.ity resista.t moment structura. cell 3D numerica. modeling

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a. Optima. Design Method Ba.ed on Sma.l a.plitude Homogeniza.ion

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Chinese a.na.s of Ma.hema.ics,Series B 2015年第5期36卷 843-854页

作者： sergio GUTIERREZ Depa.tment of Structura. a.d Geotechnica. Engineering Pontificia Universidad Catolica de Chile

a. optima. design method for two ma.eria.s ba.ed on sma.l a.plitude homogeniza.ion is presented. The method a.lows to use quite genera. objective functions a. the price tha. the two ma.eria.s should ha.e sma.l contra.ts in their releva.t physica. pa.a.eters. The following two a.plica.ions a.e shown: Stress constra.ned complia.ce minimiza.ion a.d defect loca.ion in ela.tic bodies.

关键词： Homogeniza.ion Inverse problems Rela.a.ion Stress concentra.ion

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Pa.a.etric study on smoothed pa.ticle hydrodyna.ics for a.cura.e determina.ion of dra. coefficient for a.circula. cylinder

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Wa.er Science a.d Engineering 2017年第2期10卷 143-153页

作者： Ma.ia. Ghola.i Korza.i sergio a. Ga.indo-Torres a.exa.der Scheuerma.n Da.id J. Willia.s School of Civil Engineering The University of Queensland St Lucia Brisbane QLD 4072 Australia School of Ma.hema.ics a.d Physics The University of Queensland St Lucia Brisbane QLD 4072 Australia

Simula.ions of two-dimensiona.(2D) flow pa.t a.circula. cylinder with the smoothed pa.ticle hydrodyna.ics(SPH) method were conducted in order to a.cura.ely determine the dra. coefficient. The fluid wa. modeled a. a.viscous liquid with wea. compressibility. Bounda.y conditions,such a. a.no-slip solid wa.l, inflow a.d outflow, a.d periodic bounda.ies, were employed to resemble the physica. problem. a.sensitivity a.a.ysis, which ha. been ra.ely a.dressed in previous studies, wa. conducted on severa. SPH pa.a.eters. Hence, the effects of distinct pa.a.eters, such a. the kernel choices a.d the doma.n dimensions, were investiga.ed with the goa. of obta.ning highly a.cura.e results. a.ra.ge of Reynolds numbers(1-500) wa. simula.ed, a.d the results were compa.ed with existing experimenta. da.a. It wa. observed tha. the doma.n dimensions a.d the resolution of SPH pa.ticles, in compa.ison to the obsta.le size, a.fected the obta.ned dra. coefficient significa.tly. Other pa.a.eters, such a. the ba.kground pressure, influenced the tra.sient condition, but did not influence the stea.y sta.e a. which the dra. coefficient wa. determined.

关键词： Smoothed pa.ticle hydrodyna.ics Dra. coefficient Reynolds number Sensitivity a.a.ysis Viscous flow

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Ra.S fea.ibility study of using roughness to mimic tra.sition strip effect on the crossflowsepa.a.ion over a.6:1 prola.e-spheroid

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Journa. of Hydrodyna.ics 2019年第3期31卷 570-581页

作者： Mojta.a.M. a.iri Ma.celo a. Vitola.sergio H. Spha.er, Pa.lo T. Espera.za Ocea. Technology La.ora.ory (La.Ocea.o-COPPE) Federal University of Rio de Janeiro Rio de Janeiro RJ 21941-907 Brazil

a. a.isymmetric body a. incidence experiences the three-dimensiona. crossflow sepa.a.ion. This sepa.a.ion is a.tributed to the a.verse circumferentia. pressure gra.ient. However, the sepa.a.ion pa.tern is a.so dependent upon the structure of the bounda.y la.er. In this rega.d, utiliza.ion of tra.sition strip devices in experiments on a.isymmetric bodies ma. modify this structure, a.d consequently the crossflow sepa.a.ion pa.tern. The ma.n objective of the present resea.ch is to mimic numerica.ly the tra.sition strip effect on the crossflow sepa.a.ion over a.6:1 prola.e-spheroid up to a.= 30° incidence a.d ReL = 4.2 x 10&. However, to a.oid direct modeling of the strip, which would increa.e the computa.iona. cost, a. a.tempt wa. ma.e to a.d roughness over the body surfa.e. To estima.e the roughness tha. simula.es closely the tra.sition strip effect, three different roughness va.ues were considered. The numerica. model is ba.ed on Ra.S a.d a.Reynolds stress turbulence model implemented in STa.CCM+. The simula.ions ha.e been eva.ua.ed ba.ed on the loca. a.d globa. va.ia.les a.d va.ida.ed a.a.nst the a.a.la.le experimenta. da.a. The results demonstra.e the effectiveness of using a.proper roughness va.ue to mimic the tra.sition strip effect. They a.so show the importa.ce of modeling the tra.sition strip effect, which is norma.ly not ta.en into a.count, to ca.ture the crossflow sepa.a.ion pa.tern.

关键词： a.isymmetric body crossflow sepa.a.ion tra.sition strip device CFD Ra.S equa.ions

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La.er by la.er surfa.e engineering of poly (la.tide-co-glycolide) na.opa.ticles:a.versa.ile tool for na.opa.ticle engineering for ta.geted drug delivery

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Science China.Chemistry 2013年第8期56卷 1029-1039页

作者： ROMERO Ga.riela.MURRa. Richa.d a. QIU Yua. Sa.Z Da.id MOYa.sergio E. Biosurfa.es Depa.tment CIC biomaGUNE Depa.tment of Polymer Science a.d Engineering Zhejiang University

Recent work rega.ding the La.er by La.er （LbL） engineering of poly（la.tide-co-glycolide） na.opa.ticles （PLGa.NPs） is reviewed here. The LbL engineering of PLGa.NPs is a.plied a. a.mea.s of genera.ing a.va.ced drug delivery devices with ta.lored recognition, protection, ca.go a.d relea.e properties. LbL in combina.ion with cova.ent chemistry is used to a.ta.h PEG a.d folic a.id to control cell upta.e a.d direct it towa.ds ca.cer cells. LbL coa.ings composed of chitosa. a.d a.gina.e show low protein intera.tions a.d ca. be used a. a. a.terna.ive to Pegyla.ion. The a.sembly on top of LbL coa.ings of lipid la.ers composed of va.ia.le percenta.es of 1,2-dioleoyl-sn-glycero-3-choline （DOPC） a.d 1,2-dioleoyl-sn-glycero-3-phospho- L-serine （DOPS） increa.es NP upta.e a.d directs the NPs towa.ds the endopla.mic reticulum. The a.tibody a.ti-TNF-ct is enca.sula.ed forming a.complex with a.gina.e tha. is a.sembled LbL on top of PLGa.NPs. The a.tibody is relea.ed in cell culture following first order kinetics. The relea.e kinetics of enca.sula.ed molecules inside PLGa.NPs a.e studied when the PLGa.NPs a.e coa.ed via.LbL with different polyelectrolytes. The intra.ellula. relea.e of enca.sula.ed Doxorubicin is studied in the HepG2 cell line by mea.s of Fluorescence Lifetime Ima.ing.

关键词： la.er by la.er PLGa.NPs cell upta.e a.tibody delivery lipid la.ers intra.ellula. relea.e

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Molecula. a.d crysta. a.sembly inside the ca.bon na.otube:enca.sula.ion a.d ma.ufa.turing a.proa.hes

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a.va.ces in Ma.ufa.turing 2013年第3期1卷 198-210页

作者： sergio Ma.zetti Fjordforsk a.S. Institute of Science and Technology6896 FresvikNorway Va. der Spoel La..Computa.iona. Systems a.d Biology Biomedical CentreUniversity of UppsalaP.O.Box 25675105 UppsalaSweden

Enca.sula.ion of different guestspecies such a. molecules a.d ions inside ca.bon na.otubes （CNTs） ha. been reported in the litera.ures during the la.t 15 yea.s a.d repre sents a. exciting development of na.oengineering of novel ma.eria.s a.d composites. The reported na.ocomposite ma.e ria.s show the semiconducting properties with potentia. a.plica.ions in na.osensors, na.ounits a.d na.ocircuits a. well a. a.va.ced energy tra.sfer a.d stora.e properties, a.d encompa.s ma.ufa.turing for novel na.owires, na.oelectronic devices with properties designed with optoelectronic, spin tronic a.d na.oma.netic qua.ities. This review reports on a.wide ra.ge of enca.sula.ion references with pa.ticula. focus on single molecules, a.omic cha.ns, meta. ha.ides a.d polymers enca.sula.ed inside CNTs. The enca.sula.ion methods a.d the chemica. a.d physica. qua.ities of these novel ma.eria.s a.e crucia. for the future ma.ufa.turing of novel innova.ions in na.otechnology, a.d represent therefore the current sta.eof thea.t of enca.sula.ion methods in a.va.ced ma.ufa.turing.

关键词： Enca.sula.ion Ca.bon na.otubes (CNTs)Composites conductive Molecules

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Sta.e-of-the-a.t developments in meta. a.d ca.bon-ba.ed semiconducting na.oma.eria.s： a.plica.ions a.d functions in spintronics, na.ophotonics, a.d na.oma.netics

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a.va.ces in Ma.ufa.turing 2017年第2期5卷 105-119页

作者： sergio Ma.zetti Fra.cesco Enrichi Fjordforsk MS NanoFactory Midtun 6894 VangsnesNorway Computa.iona. Biology a.d Bioinforma.ics Uppsala University 75124 Uppsala Sweden Historica. Museum of Physics a.d Resea.ch a.d Study Center Enrico Fermi 00184 Rome Italy Division of Ma.eria.s Science Department of Engineering Sciences and Mathematics Lnlea University of Technology971 87 Lulea Sweden Depa.tment of Molecula. a.d Na.osystems Sciences Ca' Foscari University of Venice 30172 Mestre VenetiaItaly Institute of Photonics a.d Na.otechnologies CSMFO Lab. &FBK-CMM IFN-CNR 38123 Povo Trento Italy

Na.oma.eria.s composed of meta.s a.d meta. a.loys a.e the most va.ua.le components in emerging micro- a.d na.o-electronic devices a.d innova.ions to da.e. The composition of these na.oma.eria.s, their qua.tum chemica. a.d physica. properties, a.d their production methods a.e in critica. need of summa.iza.ion, so tha. a.complete sta.e of the a.t of the present a.d future of na.otechnologies ca. be presented. In this review, we report on the most recent a.tivities a.d results in the fields of spintronics, na.ophotonics, a.d na.oma.netics, with pa.ticula. empha.is on meta.lic na.opa.ticles in a.loys a.d pure meta.s, a. well a. in orga.ic combina.ions a.d in rela.ion to ca.bon-ba.ed na.ostructures. This review shows tha. the combina.ory synthesis of a.loys with ra.e meta.s, such a. sca.dium, yttrium, a.d ra.e ea.ths impa.ts va.ua.le qua.ities to high-ma.netic-field compounds, a.d provides unique properties with empha.is on na.oelectronic a.d computa.iona. components. In this review, we a.so shed light on the methods of synthesis a.d the ba.kground of spintronic, na.oma.netic, a.d na.ophotonic ma.eria.s, with a.plica.ions in optics, dia.nostics, na.oelectronics, a.d computa.iona. na.otechnology. The review is importa.t for the industria. development of novel ma.eria.s, a.d for summa.izing both fa.rica.ion a.d ma.ufa.turing methods, a. well a. principles a.d functions of meta.lic na.opa.ticles.

关键词： Meta. a.loy Na.opa.ticle Spintronics Na.ophotonics Na.oma.netics Method Synthesis

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Gorenstein injective shea.es

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Frontiers of Ma.hema.ics in China 2017年第1期12卷 87-95页

作者： sergio ESTRa.a.a.ina.Ia.OB Depa.ta.ento de Ma.em~tica. Universidad de Murcia Murcia 30100 Spain Depa.tment of Ma.hema.ica. Sciences Georgia Southern University Statesboro GA 3O460 USA

We define Gorenstein injective qua.i-coherent shea.es, a.d prove tha. the notion is loca. in ca.e the scheme is Gorenstein. We a.so give a.new cha.a.teriza.ion of a.Gorenstein scheme in terms of the tota. a.yclicity o... 详细信息

关键词： Gorenstein injective Noetheria. scheme

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