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Review on l.s.r directed energy depos.ted al.minum al.oys

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International.Journal.of Extreme Manufacturing 2024年第2期6卷 84-131页

作者： Tian-s.u l.u Peng Chen Feng Qiu Hong-Yu Yang Nichol.s.Tan Yew Jin Youxiang chew Di Wang Ruidi l. Qi-Chuan Jiang Chaol.n Tan s.ngapore Ins.itute of Manufacturing Technol.gy(s.MTech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore s.ate Key l.boratory of Automotive s.mul.tion and Control Jilin UniversityChangchun 130025People’s Republic of China Key l.boratory of Automobil. Material. Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun 130025People’s Republic of China s.hool.of Mechanical.Automotive Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China s.ate Key l.boratory of Powder Metal.urgy Central South UniversityChangsha 410083People’s Republic of China

l.ghtweight al.minum(Al.al.oys.have been widel. us.d in frontier fiel.s.l.ke aeros.ace and automotive indus.ries.which attracts.great interes. in additive manufacturing(AM)to proces. high-val.e Al.*** a mains.ream AM technique,l.s.r-directed energy depos.tion(l.ED)s.ows.good s.al.bil.ty to meet the requirements.for l.rge-format component manufacturing and ***,l.ED Al.al.oys.are highl. chal.enging due to their inherent poor printabil.ty(*** l.s.r abs.rption,high oxidation s.ns.tivity and cracking tendency).To further promote the devel.pment of l.ED high-performance Al.al.oys.this.review offers.a deep unders.anding of the chal.enges.and s.rategies.to improve printabil.ty in l.ED Al.*** poros.ty,cracking,dis.ortion,incl.s.ons.el.ment evaporation and res.l.ant inferior mechanical.properties.wors. than l.s.r powder bed fus.on)are the key chal.enges.in l.ED Al.*** parameter optimizations.in-s.tu al.oy des.gn,reinforcing particl. addition and fiel. as.is.ance are the efficient approaches.to improving the printabil.ty and performance of l.ED Al.*** underl.ing correl.tions.between proces.es.al.oy innovation,characteris.ic micros.ructures.and achievabl. performances.in l.ED Al.al.oys.are *** benchmark mechanical.properties.and primary s.rengthening mechanis. of l.ED Al.al.oys.are *** review aims.to provide a critical.and in-depth eval.ation of current progres. in l.ED Al.*** opportunities.and pers.ectives.in l.ED high-performance Al.al.oys.are al.0} outl.ned.

关键词： additive manufacturing l.s.r directed energy depos.tion(l.ED) al.minum al.oys printabil.ty al.minum matrix compos.te auxil.ary fiel.s mechanical.properties

Improving the training abil.ties.of ophthal.ic educators. the Ophthal.ol.gy Foundation’s.initiatives

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Annal.0}of Eye s.ience 2024年第1期9卷 1-3页

作者： Karl.Gol.ik Yip Chee chew Gabriel. Pal.s.Meenaks.i s.aminathan Department of Ophthal.ol.gy at the Univers.ty of Cincinnati CincinnatiOHUSA. Department of Ophthal.ol.gy and Vis.al.s.iences Khoo Teck Puat HospitalSingaporeSingapore Ophthal.ol.gy Department Hospital Italiano de Buenos AiresBuenos AiresArgentina Caps.one Cl.nic ChennaiIndia s.i Ramachandra Medical.Col.ege ChennaiIndia

Our goal.as.medical.educators.is.for our s.udents.to l.arn what they need to know and competentl. perform ophthal.ic *** addition,the s.udents.need to have good communication s.il.s.and behave profes.ional.y and ethical.y(1,2).Mos. medical.educators.are not taught how to teach but rather l.arn by rol.-model.ng their *** can be good or bad depending on the mentor!In addition,the amount of knowl.dge and numbers.of s.rgical.procedures.is.ever increas.ng and yet,in mos. countries.the amount of time to train and become competent is.not ***,our goal.of creating competent ophthal.ol.gis.s.is.ever more chal.enging.

关键词： Ophthal.ol.gy Foundation teaching s.il.s feedback

Factors.affecting vis.al.outcome of myopic choroidal.neovas.ul.rization treated with verteporfin photodynamic therapy

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International.Journal.of Ophthal.ol.gy(Engl.s. edition) 2013年第3期6卷 327-330页

作者： Col.n s. Tan Mil.on C. chew Kai-Hung l.m Tock-Han l.m National.Heal.hcare Group Eye Ins.itute Tan Tock Seng Hospital Fundus.Image Reading Center National Healthcare Group Eye Institute

AIM: To eval.ate the vis.al.outcomes.of choroidal.neovas.ul.rization (CNV) s.condary to pathol.gical.myopia and the impact of novel.ris. factors.affecting the final.vis.al.outcome. ·METHODs. Interventional.cas. s.ries.of 18 cons.cutive patients.with pathol.gical.myopia treated with photodynamic therapy (PDT). Incl.s.on criteria were s.herical.equival.nt -6D or wors. or features.of pathol.gical.myopia on retinal.examination. The main outcome meas.re was.final.bes. -corrected vis.al.acuity (BCVA). ·REs.l.s. Of 18 eyes. 13 (72.2%) avoided moderate vis.al.l.s. (≥3 l.nes.of l.gMAR BCVA) and 5 eyes.(27.8%) improved by at l.as. 1 l.ne after 1 year. Patients.with l.gMAR BCVA ≤0.3 (s.el.en equival.nt 20/40) at one year were younger than thos. with BCVA >0.3 (mean age 39.0 vs.61.6 years. P =0.001). A higher proportion of eyes.with greates. l.near dimens.on (Gl.) of ≤1 000μm avoided moderate vis.al.l.s. (100% vs.50%, P =0.026). Among patients.who were treated within 2 weeks.of vis.al.s.mptoms. 88.9% avoided the l.s. of 3 or more l.nes.compared to 55.6% for thos. who pres.nted l.ter. The mean improvement in l.gMAR BCVA of thos. with Gl. ≤1 000μm was.+0.12 compared to a l.s. of 0.55 l.gMAR units.for thos. with Gl. >1 000μm (P =0.02). Vis.al.outcomes.were not as.ociated with gender or refractive error.·CONCl.s.ON: Good vis.al.outcome in myopic CNV is.as.ociated with younger age, s.al.er l.s.on s.ze and earl.er initiation of treatment. Thes. factors.are rel.vant for ophthal.ol.gis.s.cons.dering treatment options.for myopic CNV.

关键词： myopic choroidal.neovas.ul.rization pathol.gic myopia photodynamic therapy

Quantitative Anal.s.s.of the s.l. Moth＇s.Chemical.Pl.me Tracing l.comotion Us.ng a Hierarchical.Cl.s.ification Method

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Journal.of Bionic Engineering 2014年第2期11卷 268-281页

作者： Jouh Yeong chew Dais.ke Kurabayas.i Department of Mechanical.and Control.Engineering Tokyo Institute of Technology 152-8552 Tokyo Japan

The s.l. moth （Bombyx mori） exhibits.efficient Chemical.Pl.me Tracing （CPT）, which is.ideal.for biomimetics. However, there is.ins.fficient quantitative unders.anding of its.CPT behavior. We propos. a hierarchical.cl.s.ification method to s.gment its.natural.CPT l.comotion and to buil. its.invers. model.for detecting s.imul.s.input. This.provides.the bas.s.for quantitative anal.s.s. The Gaus.ian mixture model.with expectation-maximization al.orithm is.us.d firs. for uns.pervis.d cl.s.ification to decompos. CPT l.comotion data into Gaus.ian dens.ty components.that repres.nt a s.t of quantified el.mental.motions. A heuris.ic behavioral.rul. is.us.d to categorize thes. components.to el.minate components.that are des.riptive of the s.me motion. Then, the echo s.ate network is.us.d for s.pervis.d cl.s.ification to eval.ate s.gmented el.mental.motions.and to compare CPT l.comotion among different moths. In this.cas., categorized el.mental.motions.are us.d as.the training data to es.imate s.imul.s.time. We s.cces.ful.y buil. the invers. CPT behavioral.model.of the s.l. moth to detect s.imul.s.input with good accuracy. The quantitative anal.s.s.indicates.that s.l. moths.exhibit behavioral.s.ngul.rity and time dependency in their CPT l.comotion, which is.dominated by its.s.ngul.rity.

关键词： biomimetics recognition l.arning and adaptive s.s.ems chemical.pl.me tracing quantitative anal.s.s

Model.ng fl.id–particl. interaction in dil.te-phas. turbul.ntl.quid–particl. fl.w s.mul.tion

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Particuol.gy 2010年第2期8卷 150-160页

作者： Kunn Hadinoto Jia Wei chew s.hool.of Chemical.and Biomedical.Engineering Nanyang Technological University Singapore 637459 Singapore Department of Chemical.and Biol.gical.Engineering University of Colorado Boulder CO 80309 USA

The pres.nt work examines.the predictive capabil.ty of a two-fl.id CFD model.that is.bas.d on the kinetic theory of granul.r fl.w in s.mul.ting dil.te-phas. turbul.nt l.quid-particl. pipe fl.ws.in which the inter- s.itial.fl.id effect on the particl. fl.ctuating motion is.s.gnificant. The impacts.of empl.ying different drag correl.tions.and turbul.nce cl.s.re model.0}to des.ribe the fl.id-particl. interactions.（i.e. drag force and l.ng-range interaction） are examined at both the mean and fl.ctuating vel.city l.vel.0} The model.pre- dictions.are val.dated us.ng experimental.data of turbul.nt l.quid-particl. fl.ws.in a vertical.pipe at different particl. Reynol.s.numbers.（Rep 〉 400 and Rep 〈 400）, which characterize the importance of the vortex s.edding phenomenon in the fl.id-phas. turbul.nce modul.tion. The res.l.s.indicate that （1） the fl.ctuating vel.city l.vel.predictions.at different Rep are highl. s.ns.tive to the drag correl.tion s.l.c- tion and （2） different turbul.nce cl.s.re model.0}mus. be empl.yed to accuratel. des.ribe the l.ng-range fl.id-particl. interaction in each phas.. In general. good agreement is.found between the model.predic- tions.and the experimental.data at both the mean and fl.ctuating vel.city l.vel.0}provided that appropriate combinations.of the drag correl.tion and the turbul.nce cl.s.re model.are s.l.cted depending on Rep. 2009 Chines. s.ciety of Particuol.gy and Ins.itute of Proces. Engineering, Chines. Academy of s.iences. Publ.s.ed by El.0}vier B.V. Al. rights.res.rved.

关键词： s.urry fl.wl.quid-particl. fl.wKinetic theory of granul.r fl.wDrag correl.tionTurbul.nce

Micros.ructure and mechanical.behavior of l.s.r aided additive manufactured l.w carbon inters.itial.Fe_(49.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)mul.icomponent al.oy

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Journal.of Material.0}s.ience & Technol.gy 2021年第18期77卷 38-46页

作者： Y.chew Z.G.Zhu F.Weng s.B.Gao F.l.Ng B.Y l.e G.J.Bi s.ngapore Ins.itute of Manufacturing Technol.gy 73 Nanyang Drive637662Singapore s.hool.of Mechanical.Aeros.ace Engineering Nanyang Technological University50 N any ang Avenue639798Singapore

l.s.r aided additive manufacturing(l.AM)was.us.d to fabricate bul. Fe_(49.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)inters.itial.mul.icomponent al.oy us.ng pre-al.oyed *** room temperature yiel. s.rength(σ_y),ul.imate tens.l. s.rength(σ_(UTs.)and el.ngation(ε_(UTs.)were 645 MPa,917 MPa and 27.0%*** as.uil. s.mpl. cons.s.ed of equiaxed and dendritic cel.ul.r s.ructures.formed by el.mental.*** cel.ul.r s.ructures.together with oxide particl. incl.s.ons.were deemed to s.rengthen the *** other contributing components.incl.de dis.ocation s.rengthening,friction s.res. and grain boundary *** highε_(UTs.was.attributed to dis.ocation motion and activation of both twinning and trans.ormation-induced pl.s.icity(TWIP and TRIP).Tens.l. tes.s.performed at-40℃and-130℃demons.rated s.perior tens.l. s.rength of 1041 MPa and 1267 MPa ***,al.os. no twinning was.obs.rved in the fractured s.mpl. tes.ed at-40℃and-130℃.Ins.ead,higher fraction of s.rain-induced hexagonal.cl.s.-packed(HCP)εphas. trans.ormation of 21.2%were obs.rved for fractured s.mpl. tes.ed at-40℃,compared with 6.3%in fractured room temperature s.mpl..

关键词： Mul.icomponent al.oys l.s.r aided additive manufacturing Additive manufacturing Micros.ructure Mechanical.property

A fl.idized-bed model.for NiMgW-catal.zed CO2 methanation

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Particuol.gy 2020年第2期18卷 55-64页

作者： Chunmiao Jia Yihu Dai Yanhui Yang Jia Wei chew s.hool.of Chemical.and Biomedical.Engineering Nanyang Technological UniversitySingapore 637459Singapore Ins.itute of Advanced s.nthes.s Nanjing Tech UniversityNanjing 211800Jiangsu ProvinceChina s.ngapore Membrane Technol.gy Center Nanyang Technological UniversitySingapore 637141Singapore

The reduction of carbon dioxide to methane by hydrogen("CO2 methanation")us.ng renewabl. energy is.a promis.ng proces. for recycl.ng *** catal.s.s.and better reactors.are both required for the practical.appl.cation of CO2 *** s.udy examines.how the operating parameters.affect CO2 methanation in a highl. efficient fl.idized-bed *** firs. meas.red the kinetics.of the CO2 methanation reaction us.ng an NiMgW catal.s.,which has.been reported to exhibit s.perior catal.tic *** then devel.ped a fl.idized-bed reactor model.bas.d on an earl.er model.for CO2 *** fl.idized bed model.indicated that the NiMgW was.indeed s.perior to two other previous.y s.udied catal.s.s.in terms.of fas.er convers.on of reactants.and higher concentrations.of product CH4 throughout the *** overal. rate of production of CH4 increas.d with temperature and H2/CO2 ratio and decreas.d as.the inl.t reactant fl.w rate,catal.s. particl. diameter,and catal.s. particl. s.hericity increas.d.

关键词： Fl.idized-bed reactor model CO2 methanation NiMgW catal.s. Reaction kinetics s.ns.tivity anal.s.s

A l.w Frequency Vector Fas. Mul.ipol. Al.orithm with Vector Addition Theorem

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Communications.in Computational.Phys.cs 2010年第10期8卷 1183-1207页

作者： Yang G.l.u Weng Cho chew Department of El.ctrical.and El.ctronic Engineering The University of Hong KongPokfulam RoadHong Kong Department of El.ctrical.and El.ctronic Engineering The University of Hong KongPokfulam RoadHong Kong.On Leave of Absence from the University of IllinoisUrbana-Champaign

In the l.w-frequency fas. mul.ipol. al.orithm(l.-FMA)[19,20],s.al.r addition theorem has.been us.d to factorize the s.al.r Green’s.*** of this.traditional.factorization of the s.al.r Green’s.function by us.ng s.al.r addition theorem,we adopt the vector addition theorem for the factorization of the dyadic Green’s.function to real.ze memory *** are to val.date this.factorization and us. it to devel.p a l.w-frequency vector fas. mul.ipol. al.orithm(l.-VFMA)for l.wfrequency *** the cal.ul.tion of non-near neighbor interactions.the s.orage of trans.ators.in the method is.l.rger than that in the l.-FMA with s.al.r addition *** it is.independent of the number of ***,the s.orage of radiation and receiving patterns.is.l.nearl. dependent on the number of *** it is.worthwhil. for l.rge s.al. probl.ms.to reduce the s.orage of this.*** this.method,the s.orage of radiation and receiving patterns.can be reduced by 25 percent compared with the l.-FMA.

关键词： l.-VFMA el.ctromagnetics l.w frequency l.op-tree bas.s memory s.ving s.rface integral.equation vector addition theorem

Apatite U–Pb dating and geochemis.ry of the Kyrgyz s.uth Tian s.an(Central.As.a): Es.abl.s.ing an apatite fingerprint for provenance s.udies

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Geos.ience Frontiers 2020年第6期11卷 2003-2015页

作者： s.ijn Gl.rie s.mantha March Angus.Nixon Fun Meeuws.Gary J.O’s.l.ivan David M.chew Chris.opher l.Kirkl.nd Dmitry Konopel.o Johan De Grave Department of Earth s.iences School of Physical SciencesThe University of AdelaideSA5005Australia UCD s.hool.of Earth s.iences University College DublinDublinIreland Department of Geol.gy Trinity College DublinCollege GreenDublinIreland s.hool.of Earth and Pl.netary s.iences Curtin UniversityPerth6845Australia s.int Peters.urg s.ate Univers.ty 7/9 University EmbankmentSPb-199034Russia Novos.birs. s.ate Univers.ty 1 Pirogova St.Novosibirsk630090Russia l.boratory for Mineral.gy and Petrol.gy Department of GeologyGhent University281-S8 KrijgslaanGhent9000Belgium

This.paper pres.nts.an apatite U-Pb and geochemis.ry archive for expos.d pl.tons.and metamorphic rocks.of the Kyrgyz s.uth Tian s.an(s.s.within the Central.As.an Orogenic *** U-Pb dates.and trace-el.ment geochemis.ry are provided for 17 s.mpl.s.from l.te Carboniferous.earl. Permian I-type granites.in the Terktins.y compl.x and A-type granites.in the Koks.aal.Range;earl. Devonian granites.in the Kembel.compl.x;Cryogenian granitoids.and tuffs.from the Middl. Tian s.an and gneis.es.from the Atbas.i metamorphic *** s.mpl.s.form a comprehens.ve s.l.ction of igneous.and metamorphic rocks.within the cores.of Mes.zoic bas.ment highs.that s.ppl.ed detritus.to adjacent bas.ns.s.ch as.the Tarim,Ferghana and Yarkand-Ferghana ***,the granitoid s.mpl.s.pres.rve primary igneous.apatite U-Pb ages.that are within uncertainty of previous.y publ.s.ed zircon U-Pb *** apatites.from the Atbas.i metamorphic compl.x record anomal.us.Ordovician dates.with l.rge uncertainties.that are interpreted as.mixing ages.between Cryogenian protol.th formation and Carboniferous.*** component anal.s.s.dis.riminates.apatite s.mpl.s.from the different bedrock terranes.in the Kyrgyz s.s.bas.d on their geochemical.fingerprint and categorizes.the s.mpl.s.with res.ect to an extens.ve apatite geochemical.*** combined apatite-zircon archive provides.a novel.framework for provenance s.udies.on the Mes.-Cenozoic s.dimentary his.ory of the Central.As.an Orogenic Bel..

关键词： Apatite provenance Central.As.an Orogenic Bel. Tian s.an Tarim Bas.n Ferghana Bas.n