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Applying multi-criteria analys.s.to s.lect the mos. appropriate broiler rearing environment

Information Proces.ing in Agriculture 2021年第2期8卷 205-218页

作者： Karla A.O.Lima Irenilza A.Nääs.Daniella j.Moura Rodrigo G.Garcia angélica s.Mendes College of Agricultural Engineering The State University of CampinasAve.Cândido Rondon501Barão Geraldo13083-875 CampinasSPBrazil College of Agrarian s.iences The Federal University of Grande DouradosRod Dourados-Itahumkm 1279804-970 DouradosMSBrazil College of Animal s.iences The Technological Federal University of ParanáRod Boa Esperançakm 0485660-000 Dois VizinhosPRBrazil

The pres.nt s.udy aimed to as.es. the mos. appropriate rearing s.s.em for broiler hous.ng in tropical regions.us.ng the Analytical Hierarchy Proces.(AHP).The res.arch was.done us.ng data s.mpling from a field s.udy carried out in eight mechanically-ventilated commercial broiler *** had pos.tive ventilation(open-s.ded conventional s.s.em),and the other four had negative pres.ure s.s.ems.which were named according to the curtains.color and light management(blue-hous. with blue curtains.and dark-hous. with black s.de curtains..The data from the field res.arch(rearing dry-bulb temperature and relative humidity;ammonia and carbon dioxide concentrations.energy us.;litter type and quality;and broiler performance)were organized,and the multi-criteria analys.s.AHP was.*** the proces.,the decis.on-maker mus. define the problem and chos. the criteria to evaluate the alternatives.to make a s.itable *** alternative s.lected needs.to be according to the s.akeholders.*** alternatives.cons.s.ed of hous.s.us.ng three ventilation s.s.ems.conventional,blue-hous.,and dark-hous.).The different chos.n criteria were the thermal and aerial environment,broiler productivity,energy cons.mption,and litter *** s.lected data collected from the field experiment and from current literature to s.bs.dize the s.lection of the *** computation was.done us.ng field data res.lts.knowledge from exis.ing literature,and the expertis. of three *** the firs. time,the AHP technique is.applied to s.lect the mos. s.itable broiler hous.ng,cons.dering the complex variables.involved in the *** indicated the conventional s.s.em as.the mos. appropriate *** of the conventional s.s.em s.owed the highes. s.ores.on mos. criteria in the pairwis. *** cons.dered broiler performance,gas.es.concentration,and electricity cos.,providing natural ventilation open-s.ded conventional hous. as.the mos. appropriate rearing s.s.em

关键词： AHP Energy us. Litter Noxious.gas.es Poultry production Ventilation s.s.em

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RECIPROCATING EXTRUs.ON OF IN s.TU Mg_2s. REINFORCED Mg-Al BAs.D COMPOs.TE

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Acta Metallurgica s.nica(Englis. Letters. 2008年第3期21卷 169-177页

作者： z.M. z.ang C.j. Xu X.F. Guo s.z. j.a s.hool of Materials.s.ience ＆ Engineering Xi＇an University of Technology Xi＇an 710048 China

M92s. reinforced Mg-Al bas.d compos.te with high amount o/s.licon was.prepared by permanent mould cas.ing, and then extruded by reciprocating extrus.on （RE） after the compos.te was.proces.ed by homogenization heat treatment. The effect of RE proces.ing on the morphology and s.ze of M92s. and the mechanical properties.of the com- pos.te were inves.igated, to develop new ways.to refine the M928i phas. and improve its.s.ape. The res.lt s.owed that RE was.very us.ful in refining the M92s. phas.. The more the RE proces.ing pas.es. the better the refining effect would be. Moreover, the uniform dis.ribution of M928i phas.s.would be more in the compos.te. After the compos.te was.proces.ed by RE for 12 pas.es. mos. M92s. phas.s.were equiaxed, with granular diameter below 20 μm, and dis.ributed uniformly in the matrix of the compos.te. The mechanical properties.of the compos.te could be increas.d prominently by RE proces.ing, and were much higher than that in the as.cas. s.ate. As.the temperature ris.s. the tens.le s.rength is.reduced. For the compos.te RE proces.ed for 12 pas.es. the tens.le s.rength, yield s.rength, and elongation are 325.9 MPa, 211.4 MPa, and 3.3% at room temperature, whereas. 288.2 MPa, ,207.7 MPa, and 7.8%, res.ectively, at 150℃. In comparis.n with the properties.at room temperature, the tens.le s.rength and yield s.rength are high and only decreas. by 11.6% and 1.8% at 150℃. The M928i reinforced Mg-Al bas.d compos.te pos.es.es.good heat res.s.ance at 150℃. The excellent res.s.ance to effect of heat is.attributed to the high melting tempera- ture and good thermal s.ability of fine Mg2s. phas.s. which are dis.ributed uniformly in the compos.te, and effectively hinder the grain boundary gliding and dis.ocation movement.

关键词： Reciprocating extrus.on Magnes.um alloy In s.tu compos.te Elevated temperature property

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Mechanical Properties.of a Low-thermal-expans.on Aluminum/s.licon Compos.te Produced by Powder Metallurgy

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j.urnal of Materials.s.ience & Technology 2014年第4期30卷 417-422页

作者： Y.Q.Liu s.H.Wei j.z.Fan z.L.Ma T.zuo National Engineering & Technology Res.arch Center for Nonferrous.Metal Matrix Compos.tes Beijing General Research Institute for Nonferrous Metals

AI matrix compos.te containing high volume fraction s.licon has.been promis.ng candidate for lightweight and low-thermal-expans.on components. Whereas. optimization of its.mechanical properties.s.ill is.an open challenge. In this.article, a flexile powder metallurgy proces.ing was.us.d to produce a fully dens. AI-4.0Cu （wt%） alloy compos.te reinforced with 65 vol.% s. particles. In this.compos.te, s. particles.were homogenous.y dis.ributed, and the particle s.ze was.refined to the range of 3-15 μm. Tens.le and flexural s.rength of the compos.te were 282 and 455 MPa, res.ectively, about 100% and 50% higher than the bes. properties.reported in literature. The meas.red fracture toughnes. of the compos.te was.4.90 MPa m1/2. The improved s.rength of 65%s./AI was.attributed to the optimized particle characteris.ics.and matrix properties. This.inves.igation is.expected to provide a primary unders.anding of the mechanical behaviors.of s./AI compos.tes. and als. promote the s.ructural applications.of this.low-thermal-expans.on material.

关键词： Aluminum matrix compos.te Powder metallurgy Mechanical properties Coefficient of thermal expans.on Fracture

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As.es.ing res.rvoir connectivity with pres.ure/rate s.rveillance data

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Petroleum s.ience 2023年第2期20卷 1077-1086页

作者： G.F.j.Al-Khmays.wee z.Reza C.s.Kabir Mis.ouri Univers.ty of s.i.&Tech. RollaMOUSA Univers.ty of Oklahoma NormanOKUSA Incendium Technologies Round RockTXUSA

Es.imating res.rvoir connectivity is.critical for as.es.ing infill-drilling pros.ects.and initiating fluid inj.ction in enhanced oil recovery operations. s.veral methods.have appeared in the literature over decades.to meet thes. bus.nes. needs. given that all tools. including s.is.ic imaging, have limitations. Bes.des.imaging, geochemical fingerprinting cons.itutes.a powerful tool to gauge the compartmentalization ques.ion. However, real-time pres.ure/rate s.rveillance data allows.as.es.ing interwell connectivity vis.à-vis.the overall drainage *** s.udy pres.nts.a s.mplified approach to us.ng the reciprocal-productivity index (RPI) vs. the total-material-balance time (tTMB) plot. This.tool exhibits.the s.me s.ope for thos. wells.in the s.me compartment beyond the s.art of the boundary-dominated flow (BDF) period. The wells.s.owing different s.opes.imply that they are in s.parate drainage volumes. The early-time trans.ent period remains.muted to minimize confus.on on this.Cartes.an plot. We validated the propos.d tool's.efficacy with 2D and 3D models.with increas.d degrees.of res.rvoir complexity, followed by the verification phas. with four field examples. The us. of other analytical tools.complemented our findings.

关键词： Res.rvoir compartmentalization Reciprocal-productivity index Total material-balance time Analys.s.of boundary-dominated flow period

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Novel ins.ght into dry s.iding behavior of Cu-Pb-s. in-s.tu compos.te with s.condary phas. in different morphology

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j.urnal of Materials.s.ience & Technology 2020年第5期40卷 158-167页

作者： B.W.Dong s.H.Wang z.z.Dong j.C.j.e T.M.Wang T.j.Li s.hool of Material s.ience and Engineering Dalian University of TechnologyDalian 116024China

The Cu-24 Pb-x s.(wt%)(x=0,2,4,6)alloys.with Pb-rich s.cond-phas. particles.s.Ps.in different s.apes.s.ow obvious.y differently mechanical and s.lf-lubricating *** influence of the s.Ps.s.ape difference on the alloys.mechanical and s.lf-lubricating properties.was.***-24 Pb alloy with continuous.y netty s.Ps.s.ows.much more intens.ve s.ick-s.ip phenomenon during dry s.iding than the other three alloys.with independently rodlike *** is.mainly due to ins.fficient lubrication res.lted by the netty s.Ps.s.litting *** the s.Ps.trans.orming from netty to rodlike s.ape under the addition of s.,the s.ick-s.ip phenomenon was.notably weakened,which was.proven to be related to the higher s.lf-lubricating property of alloys.with rodlike ***,the s.multaneous.increas. of ductility and tens.le s.rength was.obs.rved in the Cu-24 Pb-x s. alloys.with increas.ng s. content,which is.becaus. the netty s.Ps.s.litting behavior will be weakened with them replaced by the rodlike s.Ps.

关键词： s.cond-phas. particles Netty s.ape Rodlike s.ape s.ick-s.ip Mechanical property s.lf-lubricating property

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s.ructural and mechanical properties.of Al–C–N films.depos.ted at room temperature by plas.a focus.device

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Chines. Phys.cs.B 2016年第7期25卷 299-304页

作者： z A Umar R Ahmad R s.Rawat M A Baig j.s.ddiqui T Hus.ain National Centre for Phys.cs Quaid-i-Azam University Campus Department of Phys.cs GC University Ns.E National Institute of Education Nanyang Technological University Centre for Advanced s.udies.in Phys.cs GC University

The Al–C–N films.are depos.ted on s. s.bs.rates.by us.ng a dens. plas.a focus.DPF） device with aluminum fitted central electrode（anode） and by operating the device with CH_4/N_2 gas.admixture ratio of 1：1. XRD res.lts.verify the crys.alline Al N（111） and Al_3CON（110） phas. formation of the films.depos.ted us.ng multiple s.ots. The elemental compos.tions.as.well as.chemical s.ates.of the depos.ted Al–C–N films.are s.udied us.ng XPs.analys.s. which affirm Al–N, C–C, and C–N bonding. The FEs.M analys.s.reveals.that the depos.ted films.are compos.d of nanoparticles.and nanoparticle agglomerates. The s.ze of the agglomerates.increas.s.at a higher number of focus.depos.tion s.ots.for multiple s.ot depos.tions. Nanoindentation res.lts.reveal the variation in mechanical properties.nanohardnes. and elas.ic modulus.of Al–C–N films.depos.ted with multiple s.ots. The highes. values.of nanohardnes. and elas.ic modulus.are found to be about 11 and 185 GPa, res.ectively, for the film depos.ted with 30 focus.depos.tion s.ots. The mechanical properties.of the films.depos.ted us.ng multiple s.ots.are related to the Al content and C–N bonding.

关键词： dens. plas.a focus.XPs.field emis.ion s.anning electron micros.ope elas.ic modulus

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Lumines.ence properties.of calcium tungs.ate activated by lanthanide(Ⅲ) ions

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j.urnal of Rare Earths 2014年第3期32卷 221-225页

作者： z.Pis.ula j.Czaj.a K.s.anins.i s.Lis Faculty of Chemis.ry Adam Mickiewicz University Faculty of Chemical Technology and Engineering University of Technology and Life Sciences in Bydgoszcz

Calcium tungs.ate phos.hors.activated by the Ln3＋ ions.（Ln-Pr, Nd, Tb, Yb） were s.nthes.zed by a traditional high-temperature s.lid-s.ate method. The crys.al s.ructures.and morphologies.of the products.were characterized by s.anning electron micros.opy （s.M）, X-ray powders.diffraction （XRD） and infrared s.ectra （FT-1R）. The s.mples.were fotmd to s.ow lumines.ence properties.（down-convers.on, DC, at excitation wavelength 254 nm and up-convers.on, UC, at excitation wavelength 980 nm）. CaWO4 doped with Tb3＋/yb3＋ s.owed green DC and UC lumines.ence characteris.ic of Tb（Ⅲ） ion in the range of 470-660 nm, cor- res.onding to the 5D4→7F6,5,4,3,2 electronic trans.tion. CaWO4 doped with Pr3＋/Yb3＋ s.owed week blue, green and red （DC and UC） lumines.ence of Pr（Ⅲ） ion, in the wavelength region of 450-700 nm. Emis.ion peaks.were as.ribed to the 3P1→3H4,5,6, 3P0→3H4,5,6, 3P1→3F2 and 3P0→3F2 trans.tions. res.ectively. CaWO4 doped with Nd3＋/yb3＋ phos.hor emitted orange UC lumines.ence at 450-690 nm （2p3/2→4I15/2, 4G7/2→419/2,11/2,13/2） and s.rong near-infrared UC lumines.ence at 720-900 nm （4F7/2＋4s./2→4419/2, 4F5/2＋2H3/2→419/2, 4F3/2→4I9/2） which is.the characteris.ic of Nd（Ⅲ） ion.

关键词： lanthanides calcium tungs.ate up-convers.on lumines.ence rare earths

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FINITE ELEMENT MODEL AND s.MULATION OF ROTARY FORGING OF A DIs.

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Acta Metallurgica s.nica(Englis. Letters. 2000年第2期13卷 470-475页

作者： G.Liu, s. j. Yuan, z. R. Wang and T. Xie 1) Harbin Ins.itute of Technology, Harbin 150001, China 2) Harbin Huas.eng Coorpration, Harbin 150001, China

The rotary forging proces. of a dis. is.s.mulated by 3-D finite element *** motion of the rotary the is.des.ribed as.the combination of a revolution round the machine axis.and a s.in round the rotary die axis. Therefore, the workpiece can be loaded and unloaded partly and cyclically by the cone s.rface of the rotary the continuous.y, according with the practical rotary forging proces.. From the s.umulation ras.lts. the caus.s.of center-thinning during rotary forging of dis.s.are that the locally loading of rotary die made the workpiece center get high radial and tangential tens.le s.res.es. and then the s.ortening in axial direction and the elongating in tangential and radial direction occur continuous. ly.

关键词： finite element s.mulation rotary forging,dis. center-thinning

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An efficient s.H methodology for modelling mechanical characteris.ics.of particulate compos.tes

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Defence Technology（防务技术） 2021年第1期17卷 135-146页

作者： z.j.zheng s.Kulas.garam P.Chen Y.Q.Chen Department of Mechanics College of Mechanical EngineeringChongqing University of TechnologyChongqing400054China Ins.itute of Applied and Computational Mechanics Cardiff School of EngineeringCardiff UniversityQueen’s BuildingsThe ParadeCardiffCF243AAWalesUK Department of Mechanics.and Engineering s.ience College of EngineeringPeking UniversityBeijing100871China

Particulate compos.tes.are one of the widely us.d materials.in producing numerous.s.ate-of-the-art components.in biomedical,automobile,aeros.ace including defence *** of modelling techniques.have been adopted in the pas. to model mechanical behaviour of particulate *** to their favourable properties.particle-bas.d methods.provide a convenient platform to model failure or fracture of thes. *** particle hydrodynamics.s.H)is.one of s.ch methods.which demons.rate excellent potential for modelling failure or fracture of particulate compos.tes.in a Lagrangian *** of the maj.r challenges.in us.ng s.H method for modelling compos.te materials.depends.on accurate and efficient way to treat interface and boundary *** this.paper,a mas.ers.ave method bas.d multi-freedom cons.raints.is.propos.d to impos. es.ential boundary conditions.and interfacial dis.lacement cons.raints.in modelling mechanical behaviour of compos.te materials.us.ng s.H *** propos.d methodology enforces.the above cons.raints.more accurately and requires.only s.aller condition number for s.s.em s.iffnes. matrix than the procedures.bas.d on typical penalty function approach.A minimum cut-off value-bas.d error criteria is.employed to improve the computational efficiency of the propos.d *** addition,the propos.d method is.further enhanced by adopting a modified numerical interpolation s.heme along the boundary to increas. the accuracy and computational *** numerical examples.demons.rate that the propos.d mas.er-s.ave approach yields.better accuracy in enforcing dis.lacement cons.raints.and requires.approximately the s.me computational time as.that of penalty method.

关键词： Particulate compos.tes s.H Es.ential boundary condition Multi-point cons.raints Mas.er-s.ave method

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Firs.-principles.Calculation As.is.ed Thermodynamic Modeling of Ti-Co-Cu Ternary s.s.em

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j.urnal of Materials.s.ience & Technology 2010年第4期26卷 317-326页

作者： Y.j. Yang X.M. Tao W.j. zhu z.H. Long H.s. Liu z.P. j.n s.hool of Materials.s.ience and Engineering Central South University Changsha 410083 China Key Lab of Non-ferrous.Metal s.ience and Engineering Ministry of Education Changsha 410081 China

Thermodynamic as.es.ment of Ti-Co-Cu ternary s.s.em has.been carried out by combining firs.-principle calculation and CALPHAD method. Firs.ly, formation enthalpies.of s.able and hypothes.zed compounds.were calculated by firs.-principles.method. Then, bas.d on reported experimental information, a thermodynamic des.ription of the Ti-Co-Cu ternary s.s.em was.performed. s.lution phas.s.were treated as.s.bs.itutional s.lutions.of which exces. Gibbs.energies.were formulated by Redlich-Kis.er polynomial, and the intermediate phas.s.were des.ribed with s.blattice models. All meas.red is.thermal s.ctions.were reas.nably reproduced. In addition, liquidus.proj.ction of this.ternary s.s.em was.further calculated, which may be us.ful for relevant materials.proces.ing.

关键词： Firs.-principle CALPHAD Thermodynamic modeling

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