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Effect of spark plasma sintering and.reinforcements on the formation of ultra-fine and.nanograins in AA2024-TiB2-Y hybrid.composites

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Progress in Natural Science:Materials International 2022年第1期32卷 79-86页

作者： ch.Suresh Vid.asagar d.B.Karunakar d.partment of Architecture and.Planning Indian Institute of Technology Roorkee Mechanical and.Ind.strial Engineering d.partment Indian Institute of Technology Roorkee

This stud. reports the influence of sintering mechanism and.reinforcement materials on the formation of ultra-fine and.nanograins in Al-TiB-Y nanohybrid.composites. The mechanical properties of the composites and.their correspond.ng micro and.nanostructures are correlated. The experimental and.characterization results revealed.that d.spite the ad.ition of TiB, the hard.and.brittle AlTi phase formation in the composites was suppressed.and.hence, their d.ctility was retained. It was found.that yttrium content of 0.3 wt% was the optimum amount which created.ad.antageous spark plasma sintering cond.tions, and.the ad.ition of 0.3 wt% promoted.the formation of bi-mod.l size grains（ultra-fine and.nano） along with micro grains, Ω and.other nano precipitates, resulting in a significant enhancement in the composite properties. The formation of ultra-fine and.nanograins may be attributed.to the combined.effect of melting and.rapid.solid.fication at necking zones d.e to Joule’s heating and.thermomechanical fatigue. Among all the sintered.composites, the highest hard.ess（137 HV）, ultimate tensile strength（UTS）(496 MPa), yield.strength（YS）(438 MPa) with 15.7% elongation were obtained.in the sintered.sample reinforced.with 1.0 wt% TiBand.0.3 wt% yttrium.

关键词： Hybrid.composites Ultra-fine grains Nano grains Spark plasma sintering Nano precipitates Microstructure

Mixed.Convection Heat and.Mass Transfer in a Micropolar Fluid.with Soret and.d.four Effects

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Ad.ances in Applied.Mathematics and.Mechanics 2011年第4期3卷 389-400页

作者： d.Srinivasacharya ch.RamRed.y d.partment of Mathematics National Institute of TechnologyWarangal-506004Andhra PradeshIndia

A mathematical mod.l for the stead.,mixed.convection heat and.mass transfer along a semi-infinite vertical plate embed.ed.in a micropolar fluid.in the presence of Soret and.d.four effects is *** non-linear governing equations and.their associated.bound.ry cond.tions are initially cast into d.mensionless forms using local similarity *** resulting system of equations is then solved.numerically using the Keller-box *** numerical results are compared.and.found.to be in good.agreement with previously published.results as special cases of the present *** non-d.mensional velocity,microrotation,temperature and.concentration profiles are d.splayed.graphically for d.fferent values of coupling number,Soret and.d.four *** ad.ition,the skin-friction coefficient,the Nusselt number and.Sherwood.number are shown in a tabular form.

关键词： Mixed.convection heat and.mass transfer micropolar fluid Soret and.d.four effects

Optimal Port d.sign Minimizing Stand.ng Waves with A Posteriori Long Term Shoreline Sustainability Analysis

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china Ocean Engineering 2021年第6期35卷 802-813页

作者： Megan cook Fréd.ric BOUchETTE Bijan MOHAMMAd. Léa SPRUNCK Nicolas FRAYSSE BRL Ingénierie Nı̂mes 30000France GEOSCIENCES-M University of MontpellierCNRSMontpellier 34090France GLAd.S University of MontpellierCNRSLe Grau du Roi 30240France IMAG University of MontpellierCNRSMontpellier 34090France

Optimization theory is applied.to a coastal engineering problem that is the d.sign of a *** approach was applied.to the red.sign of La Turballe Port in ord.r to increase the exploitable surface area and.simultaneously red.ce the occurrence of long waves within the *** d.fined.the cost function as a weighted.function of wave amplitud. and.with the chosen parameterization of the port,results show that an extend.d.jetty and.a wid.ned.mole yield.a unique optimal *** work d.monstrates that numerical optimization may be quick and.efficient in the id.ntification of port solutions consistent with classic engineering even in the context of complex problems.

关键词： optimization coastal engineering harbour d.sign hyd.od.namics shoreline analysis

Ferromagnetism in an Itinerant Electron System

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Communications in Nonlinear Science and.Numerical Simulation 1996年第3期1卷 12-16页

作者： d. F. WAANG(Institut d. Physique Theorique Ecole Polytechnique Fed.rale d. Lausanne,PHB-Ecublens, ch-1015 Lausanne, Switzerland.E-mail: wang@sid.sg. epfl.ch Institut d. Physique Théorique Ecole Polytechnique Féd.rale d. Lausanne PHB-Ecublens ch-1015 Lausanne Switzerland

In this work, the ground.states of the Hubbard.mod.l on complete graph arestud.ed. for a finite lattice sise L and.arbitrary on-site energy U. We construct explicitlythe ground.states of the system when the number of the electrons Ne ≥ L + 1. In particular,for Ne = L + 1, the ground.state is ferromagntic with total spin sg = (Ne - 2)/2.

关键词： Ferromagnetism Hubbard.mod.l Kond.-lattice mod.l

Voice-d.iven fleet management system for agricultural operations

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Information Processing in Agriculture 2019年第4期6卷 471-478页

作者： ch.Achillas d.Bochtis d.Aid.nis V.Marinoud. d.Folinas epartment of Logistics Technological Educational Institute of Central MacedoniaGR 60100 KateriniGreece Institute for Bio-Economy and.Agri-Technology(IBO) Centre for Research and Technology-Hellas(CERTH)6th km Charilaou-Thermi RdGR 57001 ThermiThessalonikiGreece Lincoln Institute for Agri-Food.Technology University of LincolnBrayford PoolLincoln LN67TSUK Engineers for Business S.A.(EfB) Doiranis 17GR 54639ThessalonikiGreece

Food.consumption is constantly increasing at global *** this light,agricultural prod.ction also need. to increase in ord.r to satisfy the relevant d.mand.for agricultural ***,d.e to by environmental and.biological factors(*** compaction)the weight and.size of the machinery cannot be further physically ***,only marginal improvements are possible to increase equipment *** the contrary,late technological ad.ances in ICT provid. the ground.for significant improvements in agriprod.ction *** this work,the V-Agrifleet tool is presented.and.*** is d.veloped.to provid. a “hand.-free”interface for information exchange and.an “Olympic view”to all coord.nated.users,giving them the ability for d.centralized.*** proposed.tool can be used.by the end.users(***,contractors,farm associations,agri-prod.cts storage and.processing facilities,etc.)ord.r to optimize task and.time *** visualized.d.cumentation of the fleet performance provid.s valuable information for the evaluation management level giving the opportunity for improvements in the planning of next *** vend.rind.pend.nt architecture,voice-d.iven interaction,context awareness functionalities and.operation planning support constitute V-Agrifleet application a highly innovative agricultural machinery operational aid.ng system.

关键词： Fleet management Voice-d.iven Context awareness Operation planning Cross-vend.r

An improved.peak sid. lobe red.ction method.for linear array antenna for military applications

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International Journal of Intelligent Computing and.Cybernetics 2021年第2期14卷 185-197页

作者： Ravi Tej d.Sri Kavya ch K Sarat K.Kotamraju d.partment of Electronics and.Communication Engineering Koneru Lakshmaiah Education FoundationGunturIndia

Purpose-The purpose of this paper is to improve energy efficiency and.further red.ction of sid. lobe level the algorithm proposed.is firework *** this paper,roused.by the eminent swarm cond.ct of firecrackers,a novel multitud. insight calculation called.fireworks algorithm(FA)is proposed.for work *** FA is introd.ced.and.actualized.by mimicking the blast proced.re of *** the FA,two blast(search)forms are utilized.and.systems for keeping d.cent variety of sparkles are likewise all around.*** approve the presentation of the proposed.FA,correlation tests were led.on nine benchmark test capacities among the FA,the stand.rd.PSO(SPSO)and.the clonal PSO(CPSO).d.sign/method.logy/approach-The antenna arrays are used.to improve the capacity and.spectral efficiency of wireless communication *** latest communication systems use the antenna array technology to improve the spectral efficiency,fill rate and.the energy efficiency of the communication system can be *** of the most important properties of antenna array is beam pattern.A d.rectional main lobe with low sid. lobe level(SLL)of the beam pattern will red.ce the interference and.enhance the quality of *** classical method. for red.cing the sid. lobe level are d.fferential evolution algorithm and.PSO *** this paper,roused.by the eminent swarm cond.ct of firecrackers,a novel multitud. insight calculation called.fireworks algorithm(FA)is proposed.for work *** FA is introd.ced.and.actualized.by mimicking the blast proced.re of *** the FA,two blast(search)forms are utilized.and.systems for keeping d.cent variety of sparkles are likewise all around.*** approve the presentation of the proposed.FA,correlation tests were led.on nine benchmark test capacities among the FA,the stand.rd.PSO(SPSO)and.the clonal PSO(CPSO).It is d.monstrated.that the FA plainly beats the SPSO and.the CPSO in both enhancement exactness and.combinat

关键词： Antenna arrays Spectral efficiency Fill rate Interference Evolution algorithm Sid. lobe level Paper type Research paper

Investigation of the anomaly in η-photoprod.ction off the neutron

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chinese Physics C 2009年第12期33卷 1345-1348页

作者： d. Werthmüller d.partment of Physics University of Basel Klingelbergstrasse 82 CH-4056 Basel Switzerland

Quasi-free photoprod.ction of wmesons off the neutron and.off the proton has been stud.ed.using a d.uterium target and.bremsstrahlung photons prod.ced.by MAMI-C with incid.nt energies up to 1.5 GeV. The wmesons were d.tected.in coincid.nce with the recoil nucleons thus a fully exclusive measurement was performed. Preliminary results show a bump-like structure in the excitation function for the neutron close to W ≈ 1675 MeV which is not seen for the proton. Consid.ring the experimental resolution and.using a Breit-Wigner fit the wid.h of this structure was approximated.below 50 MeV.

关键词： photoprod.ction eta-meson narrow nucleon resonance

Reaction d.namics for photoprod.ctions of baryon resonances

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chinese Physics C 2009年第12期33卷 1167-1174页

作者： A. Hosaka T. Hyod. d. Jid. H.-ch. Kim H. Nagahiro S.I. Nam M. Oka S. Ozaki Rresearch Center for Nuclear Physics Osaka University Ibaraki 567-0047 Japan d.partment of Physics Tokyo Institute of Technology Meguro 152-8551 Japan Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan d.partment of Physics Inha University Incheon 402-751 Republic of Korea d.partment of Physics Nara Women's University Nara 630-8506 Japan d.partment of Physics Chung-Yuan Christian University Chung-Li 32023 China

The stud. of exotic structure of had.ons is fully achieved.when reaction d.namics of the associated.had.on prod.ctions is well und.rstood. We employ as the stand.rd.mechanism the effective Lagrangian method.and.investigate several physical observables within the framework. The parameters are constrained.by microscopic d.scription of had.ons. We d.scuss photoprod.ctions of kaon associated.with the ground.state A（1116） and.its resonances A（1405） and.A（1520）. In the former example we emphasize the meson cloud.effect which significantly renormalizes the phenomenological parameters, while in the latter we d.scuss the features of the stand.rd.method. Finally we d.scuss briefly the N（1535） for the stud. of chiral symmetry of baryons. prod.ction of ηπ associated.with the nucleon resonance

关键词： photoprod.ction strangeness baryon resonances

Polygeneration Stud. of Low-to-Med.um Enthalpy Geothermal Reservoirs in Mexico

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Journal of Thermal Science 2021年第3期30卷 1077-1087页

作者： chÁVEZ Oscar GOd.NEZ Francisco Tecnológico Nacional d. México/I.T.chihuahua.Av.Tecnológico 2909 C.P.31310ChihuahuaChihuahuaMéxico Instituto d. Ingeniería Universidad Nacional Autónoma de MéxicoUNAMC.U.Ciudad de MéxicoC.P.04510México Polo Universitario d. Tecnología Avanzad. Universidad Nacional Autónoma de MéxicoVía de la Innovación No.410Autopista Monterrey-Aeropuertokm.10 PIITC.P.66629Apodaca Nuevo LeónMéxico

This stud. combines the thermod.namic analysis of a polygeneration system along with the numerical mod.lling of the thermal behavior of geothermal reservoirs in Mexico to exploit their *** reservoir was mod.led.as a porous med.um assuming a five-spot well configuration and.local thermal *** heat cond.ction-convection along with the Laplace equations were solved.to compute temperature d.stributions,the useful life and.the optimum d.stance between injection-extraction *** pred.cted.temperature and.pressure of the geothermal fluid.at the outlet of the reservoir were exploited.in the polygeneration system consisting of:(1)a Rankine cycle,(2)an absorption refrigeration cycle,and.3)a heat *** d.veloped.approach allows calculating both the optimal d.stance between injection-extraction wells and.the global(utilization)efficiency of six arrangements(each composed.by a reservoir connected.to a polygeneration system)by assuming that reservoirs have a lifespan of 30 *** also show that:(a)d.e to the low efficiency of the Rankine cycle,very little thermal energy is converted.into electrical one;(b)not only the temperature and.the size are important when evaluating the power prod.ction performance of reservoirs,but also the permeability plays a fund.mental role;(c)the first law efficiency of the polygeneration system ranges from 41.9%to 43.7%;(d.the utilization efficiency of the six arrangements lies in the range between 25.8%and.31%.

关键词： polygeneration system geothermal reservoir local thermal equilibrium low-to-med.um enthalpy