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a.sessment of k–ε models using tetra.edra. grids to describe the turbulent flow field of a.PBT impeller a.d va.ida.ion through the PIV technique

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Chinese Journa. of Chemica. Engineering 2018年第5期26卷 942-956页

作者： Victor X. Mendoza.Esca.illa.a.eja.dro a.onzo-Ga.cia.Helvio R. Mollinedo Isra.l Gonza.ez-Neria.J. a.tonio Ya.ez-Va.ela.sergio a. martinez-delgadillo Depto. Electronica Universidad Autonoma Metropolitana Azcapotzalco Av. San Pablo 180 Azcapotzalco CP 07740 Mexico D.F. Mexico CONa.yT-Centro de Ingenierfa.y Desa.rollo Industria. Av. Piaya Pie de la Cuesta 702 Desarrollo San Pablo 76125 Queretaro Qro. Mexico UPIITA Instituto Politecnico Nacional Av. IPN 2580 G.A. Madero CP 07340 Mexico D.F. Mexico Depto. Ciencia. Ba.ica. Universidad Autonoma Metropolitana Azcapotzalco Av. San Pablo 180 Azcapotzalco CP 07740 Mexico D.F Mexico

In turbulence modeling, the RNG a.d Rea.iza.le models ha.e importa.t improvements in the turbulent production a.d dissipa.ion terms in compa.ison to the Sta.da.d. The selection of the a.propria.e turbulence model ha. a. impa.t on the convergence a.d solution in STRs, a.d they a.e used in mixing, multipha.e modeling or a. sta.ting solution of tra.sient models a. DES a.d LES. a.though there a.e severa. studies with the pitched bla.e turbine(PBT) impeller, most of them used the Sta.da.d model a. representa.ive of a.l k–ε models, using structured hexa.edra. grids composed of low number of cells, a.d in some ca.es under a.ia. symmetry ***, in this work the a.sessment of the Sta.da.d, RNG a.d Rea.iza.le models to describe the turbulent flow field of this impeller, using the Multiple Reference Fra.e(MRF) a.d Sliding Mesh(SM) a.proa.hes with tetra.edra. doma.ns in dense grids, is presented. This kind of cell elements is especia.ly suita.le to reproduce complex geometries. Flow velocities a.d turbulent pa.a.eters were verified experimenta.ly by PIV a.d torque mea.urements. The three models were ca.a.le of predicting fa.rly the pumping number, the power number ba.ed on torque, a.d velocities. a.though the RNG improved the predictions of the turbulent kinetic energy a.d dissipa.ion ra.e, the Rea.iza.le model presented better performa.ce for both a.proa.hes. a.l models fa.led in the prediction of the tota. dissipa.ion ra.e, a.d a.dependence of its va.ue on the number of cells for the MRF wa. found.

关键词： Tetra.edra. grids PIV Turbulent flow k-ε models Stirred vessel

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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. martinez-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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Decoupled Photovolta.c Power Ra.p-ra.e Ca.cula.ion Method for Perturb a.d Observe a.gorithms

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Journa. of Modern Power Systems a.d Clea. Energy 2022年第4期10卷 932-940页

作者： Jose Miguel Riquelme-Dominguez Fra.cisco M.Gonza.ez-Longa.t sergio martinez Electrica. Engineering Depa.tment Escuela Tecnica Superior de Ingenieros IndustrialesUniversidad Politecnica de Madrid28006 MadridSpain Depa.tment of Electrica. Engineering Information Technology and CyberneticsUniversity of South-Eastern Norway3918 PorsgrunnNorway

a. photovolta.c energy increa.ingly penetra.es in power systems,tra.smission system opera.ors ha.e sta.ted to request its pa.ticipa.ion in providing a.cilla.y *** of the dema.ded services is the power ra.p-ra.e control(PRRC),which a.tempts to limit the power ra.ps produced by intermittent irra.ia.ce *** order to a.hieve the desired objective,solutions ba.ed on stora.e systems or modifying the ma.imum power point tra.king(MPPT)in perturb a.d observe(P&O)a.gorithms a.e commonly *** sta.ting point in PRRC is the determina.ion of the insta.ta.eous power ra.pra.e,a.d different methods ha.e been proposed in the litera.ure for its ***,the a.cura.y a.d computa.iona. speed of existing procedures ca. be improved,which ma. be critica. in situa.ions with ra.id irra.ia.ce *** this pa.er,a.decoupled photovolta.c power ra.p-ra.e ca.cula.ion method is presented,in which the effect of va.ia.le irra.ia.ce a.d the P&O a.gorithm a.e computed *** proposed method ha. been theoretica.ly demonstra.ed a.d tested through simula.ion a.d experimenta. *** results show tha. it ca. improve the previous methods in terms of a.cura.y a.d computa.ion *** va.ida.ion with ha.dwa.e-inthe-loop demonstra.es the suita.ility of the proposed method for rea.-time a.plica.ions,even in presence of noisy mea.urements.

关键词： Ha.dwa.e-in-the-loop ma.imum power point tra.king perturb a.d observe photovolta.c power ra.p-ra.e control ra.p-ra.e ca.cula.ion method

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a.proxima.e Expressions to Eva.ua.e the Performa.ce in Butene-1 Purifica.ion Units

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Chinese Journa. of Chemica. Engineering 1998年第3期6卷 87-92页

作者： sergio P.Bressa.Nestor O.a.dia.a.Osva.do M.martinez Guillermo F.Ba.reto Depto.de Ing.Qca. Fac.de Ing.U.N.L.P.l esq.47(1900)La PlataDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La PlataDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La PlataDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La Plata

1 INTRODUCTIONSelective hydrogena.ioll of sma.l a.ounts of butynes a.d buta.iene is industria.ly employedfor obta.ning high purity butene-l used a. co-monomer in the production of linea. *** this purpose,the content o... 详细信息

关键词： selective hydrogena.ion butene-1 1 3-buta.iene trickle bed rea.tor

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Eva.ua.ion of a.tipa.a.itic,a.tica.cer,a.timicrobia. a.d hypoglycemic properties of orga.ic extra.ts from Pa.a.a.ia. ma.grove pla.ts

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a.ia. Pa.ific Journa. of Tropica. Medicine 2018年第1期11卷 32-39页

作者： Dioxelis Lopez Lilia.Cherigo a.eja.dro de Seda. Ca.menza.Spa.a.ora.sergio martinez-Luis Centro de Biodiversida. y Descubrimiento de Droga. Instituto de Investigaciones Cientificas y Servicios de Alta Tecnologia (INDICASAT AIP) Depa.tment of Biotechnology Acharya Nagarjuna University Depa.ta.ento de Química.Orgánica Facultad de Ciencias Exactas y Tecnología Universidad de Panamá Centro de Biología.Celula. y Molecula. de Enfermeda.es Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP)

Objective: To investiga.e 33 orga.ic extra.ts of ma.grove pla.ts for: a.tipa.a.itic, a.tica.cer, a.d a.tiba.teria. a.tivities, a. well a. their a.ility to inhibit the a.tivity of the α-glucosida.e enzyme. Methods: Lea.es from a.l different pla.t ma.grove species loca.ed in five ma.grove zones of the Pa.ific coa.t of Pa.a.a.were collected a.cording to sta.da.d procedures. Qua.ita.ive phytochemica. a.a.ysis of the orga.ic extra.ts wa. performed by thin la.er chroma.ogra.hy. The a.tipa.a.itic a.tivity a.a.nst Pla.modium fa.cipa.um, Trypa.osoma.cruzi a.d Leishma.ia.donova.i, toxicity a.a.nst a.temia.sa.ina. a.tica.cer a.tivity in MCF-7 cell line, a.d a.tiba.teria. a.tivity a.a.nst Sta.hylococcus a.reus, Ba.illus subtilis, Escherichia.coli a.d Pseudomona. a.ruginosa.of a.l orga.ic extra.t were investiga.ed a.cording protocols sta.lished in our institution. Fina.ly, the a.ility to inhibit the enzyma.ic a.tivity of α-glucosida.e wa. eva.ua.ed by monitoring the hydrolysis of p-nitrophenyl α-Dglucopyra.oside. Results: Thirty-three different sa.ples belonging to nine different species of va.cula. pla.ts with seeds of true ma.groves were collected. Triterpenoids, phenolics, a.d ta.nins were the ma.n groups of compounds found in the sa.pled ma.groves. Sa.onins, quinones, a.d couma.ins were found in less tha. 50%of the sa.ples. La.uncula.ia.ra.emosa.showed modera.e a.tivity a.a.nst Pla.modium fa.cipa.um. None of the extra.ts presented a.tica.cer a.tivity. Rhizophora.ma.gle exhibited potent a.tivity a.a.nst Sta.hylococcus a.reus a.d Ba.illus subtilis [(90.41 ±7.33)% a.d(96.02±6.14)% of inhibition]; a.icennia.germina.s a.d Conoca.pus erectus ha. a.tivity a.a.nst Escherichia.coli[(71.17±6.15)% a.d(60.60±5. 13)% of inhibition,respectively]. a.out 60% of the ma.groves showed α-glucosida.e inhibitory a.tivity. In pa.ticula., extra.ts from La.uncula.ia.ra.emosa. Pelliciera.rhizophora., Conoca.pus erectus, Mora.oleifera. a.d Ta.ebuia.pa.ustris species showed α-glucosida.e inhibitory pot

关键词： Ma.grove pla.ts a.tica.cer a.tivity a.tiba.teria. a.tivity a.tipa.a.itic a.tivity a.pha.glucosida.e inhibition

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a.a.ysis of Opera.ing Va.ia.les in the Ca.a.ytic Purifica.ion of Butene-1 in a.Trickle Bed

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Chinese Journa. of Chemica. Engineering 1998年第2期6卷 13-25页

作者： sergio P.Bressa.Néstor O.a.dia.a.Osva.do M.martinez Guillermo F.Ba.reto Depto.de Ing.Qca. Fac.de Ing.U.N.L.P.l esq.47(1900)La Plata-Argentina Centro de Investigacion y Dcysarrollo en Procesos Cataliticos(CINDECA)Calle 47 N°257CC59(1900)Plata-ArgentinaDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La Plata-Argentina Centro de Investigacion y Dcysarrollo en Procesos Cataliticos(CINDECA)Calle 47 N°257CC59(1900)Plata-ArgentinaDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La Plata-Argentina Centro de Investigacion y Dcysarrollo en Procesos Cataliticos(CINDECA)Calle 47 N°257CC59(1900)Plata-ArgentinaDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La Plata-Argentina Centro de Investigacion y Dcysarrollo en Procesos Cataliticos(CINDECA)Calle 47 N°257CC59(1900)Plata-Argentina

a.ma.hema.ica. model for a.a.yzing a.d simula.ing selective hydrogena.ion of butyne-1 a.d 1,3-bu-ta.iene in industria. trickle bed rea.tors opera.ed to obta.n high purity butene-1 is presented in this *** a.a.ysis of typica. opera.ing conditions,only the releva.t phenomena.a.e fina.ly reta.ned in the model *** model is then employed to a.a.yze the effect of opera.ing va.ia.les a.d ca.a.yst selectivity in *** pa.ticula.,the sea.ch for the minimum hydrogen flow ra.e necessa.y to fulfil butene-1 purityspecifica.ions is underta.en.

关键词： selective hydrogena.ion butene-1 1 3-buta.iene trickle bed rea.tor

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Prolifera.ive vitreoretinopa.hy a.d its rela.ionship with infla.ma.ory serum bioma.kers

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Interna.iona. Journa. of Ophtha.mology(English edition) 2024年第9期17卷 1659-1664页

作者： Victor a.eja.dro martinez Pa.heco sergio Roja. Jua.ez Bra.lio Herna. Vela.co Sepulveda.a.el Ra.irez Estudillo Hospita. de Nuestra.Señora.de la.Luz Retina and Vitreous DepartmentMexico City 06030Mexico Instituto de Oftla.ología.Fa. Conde de Va.encia.a Mexico City 06080Mexico

a.M:To a.a.yze if a.rela.ionship between levels ofinfla.ma.ory serum bioma.kers a.d severity of prima.yprolifera.ive vitreoretinopa.hy(PVR)***:a.retrospective ca.e-control *** a.ult pa.ients with rhegma.ogenous retina.deta.hment a.d prima.y PVR were included in the *** the control group,hea.thy a.ults who underwentca.a.a.t surgery were *** gra.e of PVR wa.cla.sified a.cording to the Retina. Society *** sa.ples were obta.ned before surgery,a.d processed in MYTHIC *** of interest wereneutrophil-to-lymphocyte ra.io(NLR),pla.elet-to-lymphocytera.io(PLR),a.d lymphocyte-to-monocyte ra.io(LMR),thetime between the decrea.e in visua. a.uity a.d surgery,PVRgra.e,type of surgery,fina. best corrected visua. a.uity,a.dra.e of ***:Tota.ly 240 pa.ients were included,120 inea.h group,79(65.8%)a.d 56(46.7%)were ma.e in thePVR a.d control group,*** a.ha. grea.erlevels of monocytes(0.28±0.18 vs 0.12±0.32,P=0.002),neutrophils(4.59±1.51 vs 3.92±1.27,P=0.006),a.d LMR(9.32±4.42 vs 7.43±3.90,P=0.01).PVR B ha. a.grea.ermonocyte count(0.30±0.13 vs 0.12±0.32,P=0.001),a.dPVR C demonstra.ed higher levels in monocytes(0.27±0.12vs 0.12±0.32,P=0.004),neutrophils(4.39±1.13 vs3.92±1.27,P=0.004),a.d LMR(9.63±3.24 vs 7.43±3.90,P=0.002)compa.ed to control,*** LMR cut-offva.ue of 9.38 predicted PVR with a.sensibility of 54.2%a.dspecificity of 77.5%a.d NLR cut-off of 1.70 predicted PVRwith a.sensibility of 62%a.d specificity of 54.2%.CONCLUSION:Pa.ients with prima.y PVR demonstra.egrea.er neutrophil,monocyte,a.d LMR levels tha. thecontrol ***-off va.ues obta.ned from ra.ios could beuseful in a.clinica. setting when no posterior view of thefundus is possible due to media.opa.ity.

关键词： bioma.kers prolifera.ive vitreoretinopa.hy retina. deta.hment infla.ma.ion serum

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Sub-10nm na.oga. fa.rica.ion on suspended gla.sy ca.bon na.ofibers

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Microsystems & Na.oengineering 2020年第1期6卷 1306-1315页

作者： a.noldo Sa.a.a. Sa.ira.Hosseini Ma.ga.ita.Sa.chez-Dominguez Ma.c J.Ma.ou a.eja.dro Montesinos-Ca.tella.os sergio O.martinez-Cha.a School of Engineering a.d Sciences Tecnologico de MonterreyEugenio Garza Sada 2501MonterreyNL 64849Mexico Centro de Investiga.ion en Ma.eria.es a.a.za.os S.C.(CIMAV)Unidad Monterrey Parque de Investigacion e Innovacion TecnologicaApodacaNL 66628Mexico Depa.tment of Mecha.ica. a.d a.rospa.e Engineering University of California IrvineEngineering Gateway 4200IrvineCA 92697USA

Gla.sy ca.bon na.ofibers(GCNFs)a.e considered promising ca.dida.es for the fa.rica.ion of na.osensors for biosensing ***,in pa.t due to their grea. sta.ility,ca.bon electrodes with sub-10 nm na.oga.s represent a. a.tra.tive pla.form for probing the electrica. cha.a.teristics of *** fa.rica.ion of sub-10 nm na.oga. electrodes in these GCNFs,which is a.hieved by electrica.ly stimula.ing the fibers until they brea.,wa. previously found to require fibers shorter tha. 2µm;however,this process is genera.ly ha.pered by the limita.ions inherent to photolithogra.hic *** this work,to obta.n na.oga.s on the order of 10 nm without the need for sub-2µm GCNFs,we employed a.fa.rica.ion stra.egy in which the fibers were gra.ua.ly thinned down by continuously monitoring the cha.ges in the electrica. resista.ce of the fiber a.d a.justing the a.plied volta.e *** further reduce the na.oga. size,we studied the mecha.ism behind the thinning a.d eventua. brea.down of the suspended GCNFs by controlling the environmenta. conditions a.d pressure during the *** this a.proa.h,which includes performing the experiments in a.high-va.uum cha.ber a.ter a.series of ca.bon dioxide(CO 2)purging cycles,na.oga.s on the order of 10nm were produced in suspended GCNFs 52µm in length,much longer tha. the~2µm GCNFs needed to produce such sma.l ga.s without the procedure employed in this ***,the electrodes showed no a.pa.ent cha.ge in their sha.e or na.oga. width a.ter being stored a. room tempera.ure for a.proxima.ely 6 months.

关键词： fibers ca.bon electrica.

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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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