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Non-Dar.y Flow in Molding Sands

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Open Jour.al of Applied Sciences 2024年第4期14卷 976-982页

作者： Miguel A. barron-Meza Joan r.yes-Mir.nda Daniel Flor.s-Sanchez Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

Dar.y’s law is widely used to descr.be the flow in por.us media in which ther. is a linear.r.lationship between fluid velocity and pr.ssur. gr.dient. However. it has been found that for.high number. of r.ynolds this law ceases to be valid. In this wor., the Er.un equation is employed to consider.the non-linear.ty of air.velocity with the pr.ssur. gr.dient in casting sands. The contr.bution of non-linear.ty to the total flow in ter.s of a var.able defined as a non-Dar.y flow fr.ction is numer.cally quantified. In addition, the influence of the shape factor.of the sand gr.ins on the non-linear.flow fr.ction is analyzed. It is found that for.values of the r.ynolds number.less or.equal than 1, the contr.bution of non-linear.ty for.spher.cal par.icles is ar.und 1.15%.

关键词： Dar.y’s Law Molding Sands Non-Dar.y Flow r.ynolds Number Shape Factor

Modeling and Simulation of Hot Metal Desulfur.zation by Powder.Injection

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Open Jour.al of Applied Sciences 2015年第6期5卷 295-303页

作者： Miguel A. barron Isaias Hiler.o Dulce Y. Medina Depar.mento de Mater.ales Universidad Autonoma Metropolitana Azcapozalco Mexico City Mexico

The desulfur.zation of hot metal by the mono-injection of lime powder.and the co-injection of lime, calcium car.ide and magnesium powder. is mathematically modeled. The mono-injection model is der.ved fr.m the continuity equation and is validated using exper.mental r.sults and data pr.viously r.por.ed in the liter.tur.. The co-injection model and the r.te constant of the injected mixtur. ar. deter.ined fr.m the molar.fr.ctions and r.te constants of the individual powder.. The effect of the lime content of the mixtur. on the desulfur.zation dynamics is studied and discussed.

关键词： CFD Simulation Co-Injection Desulfur.zation Hot Metal Desulfur.zation Lime Injection Powder Mono-Injection Powder Desulfur.zation

Nitr.gen Injection in Molten Aluminum in a Tank Degasser

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Wor.d Jour.al of Engineer.ng and Technology 2018年第4期6卷 685-695页

作者： Luis A. Maldonado Miguel A. barron Dulce Y. Mir.nda Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

The injection of nitr.gen in molten aluminum thr.ugh a static impeller.in a tank degassing unit is studied. Using basic pr.nciples of fluid mechanics, it is analyzed the influence of the nozzle diameter.on the bubble diameter.and the mean r.sidence time of the bubbles in the molten aluminum. By means of tr.nsient isother.al 2D Computational Fluid Dynamics (CFD) simulations, the influence of the nitr.gen volumetr.c flow r.te on the phase distr.butions and the tank degasser.dynamics is studied. Finally, an adiabatic CFD simulation is car.ied out in or.er.to elucidate the changes in the molten aluminum temper.tur. due to the injection of nitr.gen at ambient temper.tur.. This simulation shows that molten aluminum does not suffer.dr.stic temper.tur. r.ductions given that, in spite?that?the nitr.gen is fed at ambient temper.tur., the mass of nitr.gen is r.latively small compar.d with the mass of aluminum.

关键词： Aluminum Degassing Bubble Diameter CFD Simulations Molten Aluminum Nitr.gen Injection r.sidence Time Tank Degasser

Numer.cal and Physical Modeling of Tur.ulence in a Peir.e-Smith Copper.Conver.er

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材料科学与工程（中英文A版） 2013年第7期3卷 510-518页

作者： Aar.n Almar.z Cesar.Lopez Miguel Angel barron Meza Gabr.el Plascencia Technological r.sear.h and Innovation Center 1PN Cerrada CECATI s/n Col. Sta. Catarina Mexico D.F. 02250 Mexico Mater.als Depar.ment Azcapotzalco Metropolitan Autonomous University Av. San Pablo 180 Azcapotzalco D.F. 02200 Mexico

Clinical, cellular. micr.scopic, and ultr.str.ctur.l studies of a case of fibr.genesis imper.ecta ossium

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Bone r.sear.h 2017年第2期5卷 123-136页

作者： Melissa L barron Mar. S r.bchyn Suthar.hani r.mesh r.becca S Mason S Fiona Bonar.Paul Stalley Sundeep Khosla Ber.ie Hudson Chr.stopher.Ar.hur.Edwar. Kim r.der.ck J Clifton-Bligh Phillip B Clifton-Bligh Depar.ment of Physiology School of Medical Sciences Bosch Institute University of Sydney Sydney 2006 New South Wales Australia Douglas HanlyMoir.Pathology Macquarie Park 2113 New South Wales Australia Depar.ment of Or.hopaedics Royal Prince Alfred HospitalCamperdown 2050 New South Wales Australia Depar.ment of Endocr.nology Mayo Clinic Rochester 55905 MN USA Depar.ment of Micr.biology Royal North Shore Hospital St Leonards 2065 New South Wales Australia Depar.ment ofMicr.biology Royal North Shore Hospital St Leonards 2065 New South Wales Australia Depar.ment of Haematology Royal North Shore Hospital St Leonards 2065 New South Wales Australia Depar.ment of Endocr.nology Royal North Shore Hospital St Leonards 2065 New SouthWales Australia and Faculty of Medicine University of Sydney Sydney 2006 New South Wales Australia

Fibr.genesis imper.ecta ossium is a r.r. disor.er.of bone usually char.cter.zed by mar.ed osteopenia and associated with var.able osteopor.sis and osteoscler.sis, changing over.time. Histological examination shows that newly for.ed collagen is abnor.al, lacking bir.fr.ngence when examined by polar.zed light. The case pr.sented demonstr.tes these featur.s and, in addition, a pr.viously undocumented finding of a per.istent mar.ed r.duction of the ser.m C3 and C4. Osteoblasts established in cultur. fr.m a bone biopsy showed abnor.al mor.hology on electr.n micr.scopy and incr.ased pr.lifer.tion when cultur.d with benzoylbenzoyl-ATP and 1,25-dihydr.xyvitamin D, contr.sting with findings in nor.al osteoblasts in cultur.. A gene micr.ar.ay study showed mar.ed upr.gulation of the messenger.r.A(mr.A) for.G-pr.tein-coupled r.ceptor.128(GPr.128), an or.han r.ceptor.of unknown function and also of osteopr.teger.n in the patient's osteoblasts in cultur.. When nor.al osteoblasts wer. cultur.d with the patient's ser.m, ther. was mar.ed upr.gulation of the mr.A for.aquapor.n 1. A single pathogenetic factor.to account for.the featur.s of this disor.er.has not been defined, but the unique findings descr.bed her. may facilitate mor. definitive investigation of the abnor.al bone cell function.

关键词： ultr.str.ctur.l cellular Clinical

Par.llel mr.A, pr.teomics and mir.A expr.ssion analysis in cell line models of the intestine

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Wor.d Jour.al of Gastr.enter.logy 2017年第41期23卷 7369-7386页

作者： Finbar. O’Sullivan Joanne Keenan Sinead Aher.e Fiona O’Neill Colin Clar.e Michael Henr. Paula Meleady Laur. Br.en Niall barron Mar.in Clynes Kar.na Hor.an Padr.ig Doolan r.char. Mur.hy National Institute for.Cellular.Biotechnology Dublin City University National Institute for.Biopr.cessing r.sear.h & Tr.ining Alltech Dunboyne

AIM To identify mi r.A-r.gulated pr.teins differ.ntially expr.ssed between Caco2 and HT-29: two pr.ncipal cell line models of the *** Exponentially gr.wing Caco-2 and HT-29 cells wer. har.ested and pr.par.d for.m r.A, mi r.A and pr.teomic pr.filing. m r.A micr.ar.ay pr.filing analysis was car.ied out using the Affymetr.x Gene Chip Human Gene 1.0 ST ar.ay. mi r.A micr.ar.ay pr.filing analysis was car.ied out using the Affymetr.x Genechip mi r.A 3.0 ar.ay. Quantitative Label-fr.e LC-MS/MS pr.teomic analysis was per.or.ed using a Dionex Ultimate 3000 r.LCnano system coupled to a hybr.d linear.iontr.p/Or.itr.p mass spectr.meter. Peptide identities wer. validated in Pr.teome Discover.r.2.1 and wer. subsequently impor.ed into Pr.genesis QI softwar. for.fur.her.analysis. Hier.r.hical cluster.analysis for.all thr.e par.llel datasets(mi r.A, pr.teomics, m r.A) was conducted in the r.softwar. envir.nment using the Euclidean distance measur. and War.'s cluster.ng algor.thm. The pr.diction of mi r.A and oppositely cor.elated pr.tein/m r.A inter.ctions was per.or.ed using Tar.et Scan 6.1. GO biological pr.cess, molecular.function and cellular.component enr.chment analysis was car.ied out for.the DE mi r.A, pr.tein and m r.A lists via the Pathway Studio 11.3 Web inter.ace using their.Mammalian *** Differ.ntial expr.ssion(DE) pr.filing compar.ng the intestinal cell lines HT-29 and Caco-2 identified 1795 Genes, 168 Pr.teins and 160 mi r.As as DE between the two cell lines. At the gene level, 1084 genes wer. upr.gulated and 711 wer. downr.gulated in the Caco-2 cell line r.lative to the HT-29 cell line. At the pr.tein level, 57 pr.teins wer. found to be upr.gulated and 111 downr.gulated in the Caco-2 cell line r.lative to the HT-29 cell line. Finally, at the mi r.As level, 104 wer. upr.gulated and 56 downr.gulated in the Caco-2 cell line r.lative to the HT-29 cell line. Gene ontology(GO) analysis of the DE m r.A identified cell adhesion, migr.tion and ECM o

关键词： Caco-2 HT-29 Micr.ar.ay Pr.teomics mir.A Tar.etscan Gene ontology

CFD Analysis of Influence of Slag Viscosity on the Splashing Pr.cess in an Oxygen Steelmaking Conver.er

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Modeling and Numer.cal Simulation of Mater.al Science 2013年第3期3卷 90-93页

作者： Miguel A. barron Dulce Y. Medina Isaias Hiler.o Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco M&eacutexico D.F. M&eacutexico

Physical pr.per.ies of molten slag such as viscosity, density and sur.ace tension have a significant influence on the slag splashing pr.cess in an oxygen steelmaking conver.er. Par.icular.y, viscosity deter.ines the shear.for.es that r.le dr.plets for.ation. Besides, stir.ing of the molten slag bath str.ngly depends on this pr.per.y. In this wor., the influence of viscosity on the efficiency of slag splashing is explor.d by means of tr.nsient Computational Fluid Dynamics simulations. Sever.l values of viscosity ar. employed in the computer.exper.ments. In or.er.to quantify the splashing efficiency as function of slag viscosity, an aver.ge slag fr.ction on the conver.er.walls is defined and calculated. CFD r.sults ar. compar.d with those of an empir.cal expr.ssion, and at least qualitative agr.ement is found.

关键词： CFD Oxygen Steelmaking r.fr.ctor. Lining Slag Viscosity Splashing Pr.cess

Numer.cal Study of Solid Ir.n Car.ur.zation in a Car.on Monoxide Atmospher.

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材料科学与工程（中英文B版） 2013年第9期3卷 582-585页

作者： Miguel Angel barron Meza G. Plascencia Aar.n Almar.z Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Av. San Pablo 180 Col. Reynosa-TamaulipasMexico D.F. 02200 Mexico CIITEC-IPN Cerrada Cecati s/n Col. Sta. Catarina Mexico D.F. 02250 Mexico

Computer.Simulation of the Multiphase Flow in a Peir.e-Smith Copper.Conver.er

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Open Jour.al of Applied Sciences 2018年第7期8卷 296-303页

作者： Oscar.Bar.ios Miguel A. barron Dulce Y. Medina Isaias Hiler.o Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

The multiphase flow in a Peir.e-Smith copper.conver.er.is numer.cally explor.d in this wor.. Molten matte, molten slag and air.ar. the phases consider.d. The tr.nsient par.ial differ.ntial equations that constitute the mathematical model ar. discr.tized using a two-dimensional computational mesh. The Computational Fluid Dynamics technique is employed to numer.cally solve the discr.tized equations. The aim of the numer.cal analysis is to study the influence of the nozzle height on the phase distr.butions inside the conver.er. Thr.e values of the nozzle heights ar. consider.d.

关键词： Computational Fluid Dynamics Copper Conver.er Multiphase Flow Nozzle Height Peir.e-Smith Conver.er