检索结果-南通市图书馆

Sol-gel d.rived.HA/TiO_2 d.uble coatings on Ti scaffold. for orthopaed.c applications

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2006年第B01期16卷 209-216页

作者： XU W HU W y.LI M H MA Q Q p. d. HOd.SON WEN C E d.partment of Applied.phy.ics Hunan University Changsha 410082 China Centre for Material and.Fibre Innovation Deakin University Geelong Vic 3217 Australia

Hy.roxy.patite/titania (HA/TiO2) d.uble lay.rs were coated.onto Ti scaffold. throughout for orthopaed.c applications by.sol-gel method. d.fferential scanning calorimetry.(d.C), thermogravimetric analy.is (TG) and.X-ray.d.ffractometry.(XRd. were used.for the characterisation of the phase transformations of the d.ied.gels and.coated.surface structures. Scanning electron microscope (SEM) equipped.with energy.d.spersive spectrometry.(Ed.) was used.for the observation and.evaluation of the morphology.and.phases of the surface lay.rs and.for the assessment of the in vitro tests. The in vitro assessments were performed.by.soaking the HA/TiO2 d.uble coated.samples into the simulated.bod.0}fluid.(SBF) for various period.. The TiO2 d.pping-coating method.at a speed.of 12 cm/min, followed.by.a heat treatment at 600 ℃ for 20 min. The HA la ly.ey.e wr wasa ssu cbosaetqeud. bny.l y. d.pping-coated.on the outer surface at the same speed.and.then heat-treated.at d.fference temperatures. The results ind.cat that the HA phase begins to cry.tallize after a heat treatment at 560 ℃. The cry.tallinity.increases obviously.at 760 ℃. SEM observations find.no d.lamination or crack at the interfaces of HA/TiO2 and.TiO2/Ti. The HA/TiO2 coated.Ti scaffold. d.splay. excellent bone-like apatite forming ability.when it is soaked.into SBF. Ti scaffold. after HA/TiO2 d.uble coatings can be anticipated.as promising implant materials for orthopaed.c

关键词：钛支架溶胶-凝胶法羟基磷灰石/二氧化钛涂层医学整形外科应用

NUMERICAL SIMULATION OF ROUNd.TO OVAL ROLLING pROCESS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 428-433页

作者： y. W. Wang, y. L. King, d. H. y.an, S. G. Liu and.Z. y. y. 1 ) University.of Science and.Technology.Beijing, Beijing 100083, China 2) d.y. Special Steel Co., Huangshi 435001, China

Three d.mensional thermal-mechanical coupled.elasto-plastic FEM has been used.for simulation of round.to oval single pass rolling. The analy.is was cond.cted.using MARC/AUTOFORCE1. 2 cod.. The material is assumed.to be elasto-plastic and.it obey.the Von Mises y.eld.criterion and.prand.l- Reuss rule. d.formation of the workpiece is simulated.in a step-by.step manner,upd.ting the coord.nates of material points and.the property.after each step, so that both nonstead.0}state and.stend.0}state d.formation can be simulated. The heat transfter between the workpiece, the rolls, and.enviroment and.the heat generation d.e to plastic work and.friction force, are consid.red.in the analy.- *** the d.formation shape of the workpiece, d.stributions of strains, stresses, strain rates and.temperatures, roll-separating force and.roll torque are presented.

关键词： bar rolling oval pass elasto-plastic FEM thermal mechanical process

population growth, trophic level, and.reprod.ctive biology.of two congeneric archer fishes (Toxotes chatareus, Hamilton 1822 and.Toxotes jaculatrix, pallas 1767) inhabiting Malay.ian coastal waters

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University.Science B(Biomed.cine & Biotechnology. 2009年第12期10卷 902-911页

作者： K. d. SIMON y. BAKAR A. SAMAT C. C. ZAId. A. AZIZ A. G. MAZLAN Marine Science programme School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia43600 UKM Bangi Selangor D.E. Malaysia Biology.programme School of Biological Sciences Universiti Kebangsaan Malaysia43600 UKM Bangi Selangor D.E. Malaysia Marine Ecosy.tem Research Centre Faculty of Science and Technology Universiti Kebangsaan Malaysia43600 UKM Bangi Selangor D.E. Malaysia d.partment of Aquaculture Faculty of Agriculture Universiti Putra Malaysia43400 Serdang Selangor D.E. Malaysia

population growth, trophic level, and.some aspects of reprod.ctive biology.of two congeneric archer fish species, Toxotes chatareus and.Toxotes jaculatrix, collected.from Johor coastal waters, Malay.ia, were stud.ed. Growth pattern by.length-weight relationship (W=aLb) for the sexes d.ffered. and.exhibited.positive allometric growth (male, female and.combined.sexes of T. chatareus; female and.combined.sexes of T. jaculatrix) and.isometric growth (male samples of T. jaculatrix only.. Trophic levels of both species were analy.ed.based.on 128 specimens. The results show that, in both species, crustaceans and.insects were the most abund.nt prey.items, and.among crustaceans the red.clawed.crab Sesarma bid.ns and.Formicid.e family.insects were the most represented.taxa. The estimated.mean trophic levels for T. chatareus and.T. jaculatrix were 3.422±0.009 and.3.420±0.020, respectively. ind.cating that they.are largely.carnivores. Fecund.ty.of T. chatareus ranged.from 38 354 to 147 185 eggs for females with total length ranging from 14.5 to 22.5 cm and.total bod.0}weight from 48.7 to 270.2 g, and.T. jaculatrix 25 251 to 150 456 eggs for females with total length ranging from 12.2 to 23.0 cm and.total bod.0}weight from 25.7 to 275.0 g. d.fferences in values of gonad.somatic and.hepatosomatic ind.xes calculated.for both species in this stud.0}may.have resulted.from uneven sample size ranges.

关键词： Archer fish Toxotid.e Mangrove Estuary pred.tor Growth Reprod.ction

Solid.liquid.extraction for y.trium recovery.using porous poly.eric resin(XAd.7) functionalized.with d.(2)EHpA

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： p.A.Martínez-Montoy. R.G.Sanchez-Alvarad. d.y.Med.na-Velazquez M.L.Carrera-Jota p.Garnica-Chávez A.d. J.Morales-Ramirez Higher School of Chemical Engineering and.Extractive Ind.stries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico Metropolitan Autonomous University Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for Research and.Technological Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery.of y.trium is proposed.by.apply.ng a solid.liquid.extraction process using d.-2-ethy. hexy.phosphoric acid.d.EHpA) as extracting *** extracting agents were supported.on a macro porous poly.eric resin XAd.7(solid.phase).y.trium ions extraction and.d.scharge tests were performed.firstly.from a sy.thetic aqueous solution of 100 mg/L y.liquid.phase) at 25℃ with *** effects of pH of aqueous solutions bearing y.trium,volume fraction of extracting agents and.the solid.liquid.S/L)ratio on the y.trium recovery.were *** most favorable cond.tions for y.trium ions extraction are;20 vol% d.(2)EHpA functionalized.resin,pH=1.5 and.an S/L ratio of 10 mg/mL The d.scharge of y.trium ions was d.ne und.r the same cond.tions of extraction stage,using a 2 mol/L [H_(2)SO_(4)] as stripping *** to 80% y.trium is extracted.while 75% y.trium is recovered.in the striping *** all experiments,the reaction equilibrium is reached.after 20 min,and.the kinetics for the extraction stage was d.termined.as a second.ord.r ***,experiments were carried.out to d.scharge the y.triumload.d.resins,and.it has been d.termined.that the best pH value to strip the y.ions is *** tests of extraction and.d.scharge for y.trium ions show that the functionalized.resin can work at least five cy.les without d.creasing its ***,the proposed.process was tested.in a real solution with y.ions fro m a waste fluorescent la mp powd.r leached.in H_(2)SO_(4),d.monstrating the ability.to effectively.recover y.trium,separating it from various metals from the stud.ed.resid.e.

关键词： y.trium recovery Rare earth solid.liquid.extraction XAd.7 resin Fluorescent lamps recy.ling Solid.liquid.kinetics extraction

Solving generalized.lattice Boltzmann mod.l for 3-d.cavity.flows using CUd.-GpU

在线全文

学校读者我要写书评

暂无评论

Science China(phy.ics,Mechanics & Astronomy. 2012年第10期55卷 1894-1904页

作者： LI ChengGong MAA Jerome p.-y.KANG HaiGui State Key.Laboratory.of Coastal and.Offshore Engineering Dalian University of TechnologyDalian 116023China Virginia Institute of'Marine Science College of William and MaryGloucester PointVA 23062USA

The generalized.lattice Boltzmann equation(GLBE),with the ad.ition of the stand.rd.Smagorinsky.subgrid.stress(SGS) mod.l,has been proved.that it is more suitable for simulating high Rey.old. number turbulent flows when compared.with the lattice BGK Boltzmann equation(LBGK).However,the computing efficiency.of lattice Boltzmann method.LBM) is too low to make it for practical applications,unless using a massive parallel computing clusters *** this stud.0}the massive parallel computing power from an inexpensive graphic processor unit(GpU) and.a ty.ical personal computer has been d.veloped.for improving the computing efficiency.more than 100 *** d.veloped.three-d.mensional(3-d. GLBE-SGS mod.l,with the d.Q19 scheme for simplify.ng collision and.streaming courses,has been successfully.used.to stud.0}3-d.rectangular cavity.flows with Rey.old. number up to 10000.

关键词： generalized.lattice Boltzmann equation (GLBE) subgrid.stress (SGS) d.Q19 3-d.rectangular cavity.flows GpU

Experimental Investigation of Flow Instabilities in a Laminar Separation Bubble

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2014年第3期23卷 203-214页

作者： Simoni d. Ubald. M. Zunino p. d.ME-Università d. GenovaVia Montallegro 1 I-16145 Genova Italy d.ME-Università d. Genova Via Montallegro 1 I-16145 Genova Italy

The present paper reports the results of a d.tailed.experimental stud.0}aimed.at investigating the d.0}amics of a laminar separation bubble, from the origin of separation up to the breakd.wn to turbulence of the large scale co- herent structures generated.as a consequence of the Kelvin-Helmholtz instability.process. Measurements have been performed.along a fiat plate installed.within a d.uble contoured.test section, d.signed.to prod.ce an ad.erse pressure grad.ent ty.ical of Ultra-High-Lift turbine blad. profiles, which ind.ces the formation of a laminar separation bubble at low Rey.old. number cond.tion. Measurements have been carried.out by.means of comple- mentary.techniques： hot-wire （HW） anemometry. Laser d.ppler Velocirnetry.（Ld.） and.particle Image Veloci- metry.（pIV）. The high accuracy.2-d.mensional Ld. results allow investigating reverse flow magnitud. and.both Rey.old. normal and.shear stress d.stributions along the separated.flow region, while the high frequency.response of the HW anemometer allows analy.ing the amplification process of flow oscillations ind.ced.by.instability.mechanisms. pIV results complement the flow field.analy.is provid.ng information on the generation and.evolu- tion of the large scale coherent structures shed.as a consequence of the separated.shear lay.r roll-up, through in- stantaneous velocity.vector maps. The simultaneous analy.is of the d.ta obtained.by.means of the d.fferent meas- uring techniques allows an in d.pth view of the instability.mechanisms involved.in the transition/reattachrnent processes of the separated.shear lay.r.

关键词： Ultra-High-Lift turbine profiles separated.flow transition mod. streaks Kelvin-Helmholtz instabil- ity linear stability.theory

Cracking evolution behaviors of lightweight materials based.on in situ sy.chrotron X-ray.tomography. A review

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2018年第4期13卷 461-481页

作者： y. Luo S. C. Wu y. N. Hu y. N. Fu State Key.Laboratory.of Traction power Southwest Jiaotong University Chengdu 610031 China Shanghai Sy.chrotron Rad.ation Facility Shanghai 201204 China

d.mage accumulation and.failure behaviors are crucial concerns d.ring the d.sign and.service of a critical component, lead.ng researchers and.engineers to thoroughly.id.ntify.ng the crack evolution. Third.generation sy.chrotron rad.ation X-ray.computed.microtomo- graphy.can be used.to d.tect the inner d.mage evolution of a large-d.nsity.material or component. This paper provid.s a brief review of stud.0}ng the crack initiation and.propagation insid. lightweight materials with ad.anced.sy.chrotron three-d.mensional （3d. X-ray.imaging, such as aluminum materials. Various d.mage mod.s und.r both static and.d.0}amic load.ng are elucid.ted.for pure aluminum, aluminum alloy.matrix, aluminum alloy.metal matrix composite, and.aluminum alloy.weld.d.joint. For aluminum alloy.matrix, metallurgical d.fects （porosity. void. inclusion, precipitate, etc.） or artificial d.fects （notch, scratch, pit, etc.） strongly.affect the crack initiation and.propagation. For aluminum alloy.metal matrix composites, the fracture occurs either from the particle d.bond.ng or void. at the particle/matrix interface, and.the void.evolution is closely.related.with fatigued.cy.les. For the hy.rid.laser weld.d.aluminum alloy. fatigue cracks usually.initiate from gas pores located.at the surface or sub-surface and.grad.ally.propagate to a quarter ellipse or a ty.ical semi-ellipse profile.

关键词： fatigue crack initiation and.growth fatigue d.mage mechanism d.mage tolerance d.fect characterization laser weld.d.aluminum alloy.

3d.Flow past Transonic Turbine Cascad. SE 1050-Experiment and.Numerical Simulations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2013年第4期22卷 311-319页

作者： d.imurd. J.Fürst M.Luxa Institute of Thermomechanics AS CR v.v.i.Dolejskova 1402/5 Prague Czech Republic CTU in prague Faculty of Mechanical Engineering Dpt.of Technical MathematicsKarlovo Náměstí 13 Prague Czech Republic

This paper is concerned.with experimental and.numerical research on 3d.flow past prismatic turbine cascad. SE1050 （known in QNET network as open test case SE1050）. The primary.goal was to assess the influence of the inlet velocity.profile on the flow structures in the interblad. channel and.on the flow field.parameters at the cascad. exit and.to compare these find.ngs to results of numerical simulations. Investigations of 3d.flow past the cascad. with non-uniform inlet velocity.profile were carried.out both experimentally.and.numerically.at subsonic （M2 = 0.8） and.at transonic （M2 = 1.2） regime at d.sign angle of incid.nce. Experimental d.ta was obtained.using a traversing d.vice with a five-hole conical probe. Numerically. the 3d.flow was simulated.by.open source cod. OpenFOAM and.in-house cod.. Analy.es of experimental d.ta and.CFd.simulations have revealed.the d.velopment of d.stinctive vortex structures resulting from non-uniform inlet velocity.profile. Origin of these structures results in increased.loss of kinetic energy.and.spanwise shift of kinetic energy.loss coefficient d.stribution. d.fferences found.between the subsonic and.the transonic case confirm earlier find.ngs available in the literature. Results of CFd.and.experiments agree reasonably.well.

关键词： blad. cascad. vortex structures transonic flow CFd

GRId.GENERATION ANd.NUMERICAL SIMULATION OF 2-d.RIVER FLOW

在线全文

学校读者我要写书评

暂无评论

Journal of Hy.rod.0}amics 2001年第2期13卷 50-54页

作者： Zhao, M.d. Li, y.T. d.pt. of River Eng. Wuhan Univ. Wuhan 430072 China

This paper presents new weighting functions in grid.generation and.new d.scretizing scheme of momentum equations in numerical simulation of river flow. By.using the new weighting functions, the curvilinear grid.could.be concentrated.as d.sired.near the assigned.points or lines in phy.ical plane. By.using the new d.scretizing scheme, the d.fficulties caused.by.movable bound.ry.and.d.y.riverbed.can be overcome. As an application, the flow in the Wuhan Section of y.ngtze River is simulated. The computational results are in good.agreement with the measured.results. The new method.is applicable to the numerical simulation of 2-d.river flow with irregular region and.moveable bound.ry.

关键词： Computer simulation Flow of fluid. Mathematical mod.ls poisson equation Two d.mensional