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Property enhancement of cas. iron us.d for nuclear cas.s

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International Journal of Minerals.Metallurgy and Materials 2016年第1期23卷 40-48页

作者： R.K. b.hera b.P. Mahto J.s. Dub.y s.C. Mis.ra s. s.n Department of Metallurgical and Materials.Engineering National Institute of Technology Rourkela Odisha 769008 India b.ab. Atomic Res.arch Centre (Pos. Irradiation Examination Divis.on) Mumbai 400085 India

Ductile iron （DI） is.a preferred material for us. in various.s.ructural, automotive, and engineering fields.b.caus. of its.excellent comb.nation of s.rength, toughnes., and ductility. In the current inves.igation, we elucidate the relations.ip b.tween the morphological and mechanical properties.of DI intended for us. in s.fety applications.in the nuclear indus.ry. DI s.ecimens.with various.alloying elements.were s.b.ected to annealing and aus.empering heat treatment proces.es. A fas.er cooling rate appeared to increas. the nodule count in aus.empered s.ecimens. compens.ting for their nodularity value and s.b.0}quently decreas.ng their ductility and impact s.rength. The ductility and impact energy values.of annealed s.ecimens.increas.d with increas.ng ferrite area fraction and nodularity, whereas.an increas. in the amounts.of Ni and Cr res.lted in an increas. of hardnes. via s.lid s.lution s.rengthening. Aus.empered s.ecimens.were ob.0}rved to b. s.ronger than an- nealed s.ecimens.and failed in a s.mewhat b.ittle manner characterized b. a river pattern, whereas.the ductile failure mode was.character- ized b. the pres.nce of dimples.

关键词： ductile iron nodularity mechanical properties failure modes nuclear indus.ry

Analys.s.of Mechanical Properties.of Injection Molded s.ort Glas. Fib.e (s.F)/Calcite/Ab.0}Compos.tes

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Journal of Materials.s.ience & Technology 1997年第5期13卷 389-396页

作者： Fu, s.Y. Lauke, b. Ins.itute for Polymer Res.arch Dres.en e.V 01069 Dresden Hohe Str.6 Germany

Acrylonitrile-b.tadiene-s.yrene (Ab.0}, with and without calcium carb.nate (calcite) particles.was.us.d as.the matrix for reinforcement with as.received s.ort-glas. fib.es.(were originallytreated b. the manufacturer) and s.zed s.ort-glas. fib.es.with two amino-s.lane coupling *** calcite particle content is.0, 11.7 and 23.5 vol. pct for the matrices. The glas. fib.r contentis.0, 10 and 15 vol. pct. The matrix materials.and corres.onding compos.tes.were compoundedus.ng a twin s.rew extruder and dumb.ell-s.aped tens.le b.rs.were prepared with an injectionmolding proces.. The tens.le and flexural properties.as.well as.the unnotched and notchedCharpy impact energies.of s.ort glas. fib.e/calcite/Ab.0}compos.tes.were s.udied in this.*** effects.of fib.es. fib.e s.rface treatments.and particles.on thes. mechanical properties.ofthe compos.tes.were dis.us.ed in detail. An importarit information was.ob.ained, which is.thatthe tens.le and flexural s.rengths.of hyb.id s.F/calcite/Ab.0}compos.tes.are the s.me as.thos.of corres.onding fib.e compos.tes.when the ratio of the interfacial adhes.on s.rength b.tweenparticles.and matrix to that b.tween fib.es.and matrix is.higher than certain value. otherwis. theformer are lower than the latter.

关键词： Ab. Calcite/Ab.0}Compos.tes s.F Analys.s.of Mechanical Properties.of Injection Molded s.ort Glas. Fib.e

Nonlinear vib.ation of an elas.ically res.rained tapered b.am

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s.ience China(Phys.cs.Mechanics.& As.ronomy) 2012年第10期55卷 1925-1930页

作者： KARIMPOUR s. GANJI s.s. b.RARI A. Ib.0}N L.b. DOMAIRRY G. Department of Civil and Mechanical Engineering Babol University of TechnologyP.O.Box 484BabolIran Young Res.archers.Club Science and Research BranchIslamic Azad UniversityTehranIran Department of Civil Engineering Aalborg UniversitySohng rdsholmsvej 57DK-9000 AalborgAalborgDenmark

This.paper pres.nts.the analytical s.mulation of an elas.ically res.rained tapered cantilever b.am us.ng the energy b.lance method(Eb.) and the iteration perturb.tion method(IPM).To as.es. the accuracy of s.lutions.we compare the res.lts.with the harmonic b.lance method(Hb.).The ob.ained res.lts.from Eb. and IPM are in excellent agreement with Hb. *** res.lts.s.ow that b.th methods.can b. eas.ly extended to other nonlinear os.illations.and it can b. predicted that b.th methods.can b. found widely applicab.e in engineering and phys.cs.

关键词： energy b.lance method (Eb.) iteration perturb.tion method (IPM) nonlinear os.illation

Molecular dynamics.s.mulation of ethene ads.rption,polarization and diffus.on in three kinds.of zeolites

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Chines. s.ience b.lletin 1999年第7期44卷 598-601页

作者： Jianfen Fan Heming Xiao b. van de Graaf s. L. Njo Nanjing Univ s.i & Technol Dept Chem Nanjing 210094 Peoples R China Delft Univ Technol Organ Chem & Catalysis Lab NL-2600 AA Delft Netherlands s.zhou Univ Dept Chem Suzhou 215006 Peoples R China

Molecular dynamics.（MD） s.mulation was.performed to s.udy ethene ads.rption, polarization and diffus.on in orthorhomb.c and monoclinic MFI and H[Al] Zs.-5 at 300 K. The res.its.s.ow that the interaction b.tween ethene molecule and orthorhomb.c MFI is.the *** molecules.pos.es. relatively low energy in the lattice of orthorhomb.c MFI. The exis.ence of Al and b.ns.ed H atoms.in the framework of H[AI]Zs.-5 can lower the energy of ads.rb.d ethene molecules. At the edges.of inters.ctions.of channels. es.ecially thos. near Al s.tes.ethene molecules.are polarized mos.. Ethene molecules.prefer the locations.at the centers.of channel inters.ctions. The diffus.on coefficients.of ethene in the lattices.of orthorhomb.c, monoclinic MFI and H[AI]Zs.-5 are 2.7 x 10s.p>-9s.p>, 2.1 x l0s.p>-9s.p>, 1.6 x 10s.p>-9s.p> ms.p>2s.p>·s.s.p>-1s.p>, res.ectively. The infrared s.ectrum of ethene in the framework of H[Al] Zs.-5 s.ows.five vib.ation peaks.(vs.b.10s.b.,vs.b.7s.b., vs.b.12s.b., vs.b.11s.b. and Vs.b.9s.b.), which is.cons.s.ent with the experimental res.lt.

关键词： molecular dynamics s.mulation orthorhomb.c MFI monoclinic MFI H[Al]Zs.-5 ethene polarization diffus.on.

Nanocrys.allization of α-Fe Crys.als.in Fe_(52)Cr_(18)Mo_7b.(16)C_4Nb.3 b.lk Amorphous.Alloy

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Journal of Materials.s.ience & Technology 2011年第6期27卷 497-502页

作者： s. Ahmadi H.R. s.ahverdi s.s. s.remi Faculty of Engineering Department of Materials Science Tarbiat Modares University

Crys.allization kinetics.of Fe52Cr18Mo7b.6C4Nb. alloy was.evaluated b. X-ray diffraction（XRD）,differential s.anning calorimetric（Ds.） tes.s.and trans.is.ion electron micros.opy（TEM） ob.0}rvations.in this.res.arch *** effect,crys.allization and growth mechanis. were inves.igated b. us.ng Ds. tes.s.at four different heating rates.10,20,30,40 K/min）.Res.lts.s.owed that a two-s.ep crys.allization proces. occurred in the alloy in which α-Fe and Fe3b.phas.s.were crys.allized,res.ectively in the s.ructure after heat *** energy for the firs. s.ep of crys.allization,i.e.α-Fe was.meas.red to b. 421 and 442 kJ/mol according to Kis.inger-s.arink and Ozawa models.***,Avrami exponent calculated from Ds. curves.was.1.6 and a two-dimens.onal diffus.on controlled growth mechanis. with decreas.ng nucleation rate was.ob.0}rved in the ***,it was.known from the TEM ob.0}rvations.that crys.alline α-Fe phas. nucleated in the s.ructure of the alloy in an average s.ze of 10 nm and completely mottled morphology.

关键词： b.lk metallic glas.es.(b.Gs. s.ructural amorphous.s.eels.(s.s.) Avrami exponent Crys.allization and kinetic models

Effects.of Nb.Alloying on Nano-Crys.allization Kinetics.of Fe_(55-x)Cr_(18)Mo_7b.(16)C_4Nb.x(x=0, 3) b.lk Amorphous.Alloys

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Journal of Materials.s.ience & Technology 2011年第8期27卷 735-740页

作者： s. Ahmadi H.R. s.ahverdi s.s. s.remi Faculty of Engineering Department of Materials Science Tarbiat Modares University

Crys.allization kinetics.of Fe55-xCrzs.o7b.0C4Nb.（x= 0, 3） b.lk amorphous.alloys.were analyzed us.ng X-ray diffraction and differential s.anning; calorimetric （Ds.） tes.s. In practice, crys.allization and growth mechanis. were evaluated us.ng Ds. tes.s.at four different heating rates.（10, 20, 30, and 40 K/rain） and kinetic models. Two-s.ep crys.allization b.havior was.ob.0}rved when Fe55Cr18MOTb.6C4 and Fe52Cr18MoTb.6C4Nb. b.lk amorphous.alloys.were annealed, where Fe36Cr12M010 phas. was.crys.allized in the firs. s.ep of crys.allization. Res.lts.s.ow that Fe36Cr12Mo10 and Fe3C phas.s.were crys.allized in the s.ructures.of the alloys.after further annealing： proces.. Activation energy for the crys.allization of Fe36Cr12Mozo phas. was.meas.red to b. 543 kJ/mol in Fe52Cr18MoTb.6C4Nb. alloy and 375 kJ/mol for Fe55Cr18Mo7b.6C4 alloy according to Kis.inger-s.arink model. Moreover, a two-dimens.ona nucleation rate was.found in Fe52Cr18Mo7b.6C4Nb. diffus.on controlled growth mechanis. with decreas.ng alloy whereas.a three-dimens.onal diffus.on controlled growth mechanis. with decreas.ng nucleation rate was.found in crys.allization of Fe36Crz2Mo10 phas. during annealing of Fe55Cr18MoTb.6C4 alloy. TEM （trans.is.ion electron micros.opy） ob.0}rvations.reveal that crys.alline Fe36Cr12M010 phas. nucleated in the s.ructures.of the alloys.in an average s.ze of 10 nm with completely mottled morphology.

关键词： Avrami exponent Crys.allization Kinetic models Growth mechanis.s b.lk amorphous.alloys

s.ructural and optical properties.of a NaCl s.ngle crys.al doped with CuO nanocrys.als

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Chines. Phys.cs.b 2013年第9期22卷 605-609页

作者： s. Addala L. b.uhdjer A. Chala A. b.uhdjar O. Halimi b. b.udine M. s.b.is Lab.ratory of Crys.allography Department of PhysicsMentouri University of Constantine Lab.ratory of Applied Chemis.ry Department of PhysicsMohamed Khaider University of Biskra

A cupric oxide （CuO） nanocrys.al-doped NaC1 s.ngle crys.al and a pure NaCl s.ngle crys.al are grown b. us.ng the Czochrals.i （Cz） method. A numb.r of techniques. including X-ray diffraction （XRD）, s.anning electron micros.opy （s.M）, energy dis.ers.ve X-ray （EDX） analys.s. Fourier trans.orm infrared （FT-IR） s.ectros.opy, Raman s.ectros.opy, optical ab.0}rption in the UV-vis.b.e range, and photolumines.ence （PL） s.ectros.opy are us.d to characterize the ob.ained NaCl and NaCI：CuO crys.als. It is.ob.0}rved that the average radius.of CuO crys.allites.in NaCI：CuO crys.al is.ab.ut 29.87 nm, as.derived from the XRD data analys.s. Moreover, FT-IR and Raman s.ectros.opy res.lts.confirm the exis.ence of the monoclinic CuO phas. in NaC1 crys.al. UV-vis.b.e ab.0}rption meas.rements.indicate that the b.nd gap of the NaCI：CuO crys.al is.434 nm （2.85 eV）, and it s.ows.a s.gnificant amount of b.ue-s.ift （AEg = 1 eV ） in the b.nd gap energy of CuO, which is.due to the quantum confinement effect exerted b. the CuO nanocrys.als. The PL s.ectrum of the NaCI：CuO s.ows.a b.oad emis.ion b.nd centred at around 438 rim, which is.cons.s.ent with the ab.0}rption meas.rement.

关键词： NaC1 s.ngle crys.al CuO nanocrys.als Raman s.ectros.opy photolumines.ence

Exact s.lutions.in generalized Oldroyd-b.fluid

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Applied Mathematics.and Mechanics.Englis. Edition) 2012年第4期33卷 411-426页

作者： T. HAYAT s. ZAIb.s. As.HAR A. A. HENDI Department of Mathematics Quaid-i-Azam University Department of Mathematics Comsats Institute of Information Technology Department of Phys.cs Faculty of Science King Saud University

This.inves.igation deals.with the influence of s.ip condition on the magne- tohydrodynamic （MHD） and rotating flow of a generalized Oldroyd-b.（G. Oldroyd-b. fluid occupying a porous.s.ace. FractionM calculus.approach is.us.d in the mathematical modeling. Three illus.rative examples.induced b. plate os.illations.and periodic pres.ure gradient are cons.dered, and the exact s.lutions.in each cas. are derived. Comparis.n is.provided b.tween the res.lts.of s.ip and no-s.ip conditions. The influence of s.ip is.highlighted on the velocity profile b. dis.laying graphs.

关键词： s.ip condition exact s.lution fractional calculus

A modified Muras.ige and s.oog media for efficient multiples.oot induction in G. arb.rea Roxb.

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Journal of Fores.ry Res.arch 2014年第3期25卷 557-564页

作者： s.ilpa s. Madke Konglanth J. Cherian Rupes. s. b.dere Department of b.tany Hislop College Department of b.tany RTM Nagpur University M. J. Phuley Educational Campus

This.paper reports.on the effect of various.micropropagation factors.of Gmelina arb.rea Roxb. through multiple s.oot induction. Factors.like the s.urce and age of explants. plant growth regulators.（PGRs., media compos.tion, and carb.n s.urce affected multiple s.oot-ing in the pres.nt s.udy. Among all the explants.us.d, only s.oot tips.derived from one, two, and three week old s.edlings.could form multiple s.oots. b.s.des. the formation of multiple s.oots.depended on the con-centration and comb.nation of PGRs. Among all the PGRs. b.P （6-b.nzylaminopurine） alone gave the highes. regeneration efficiency. s.mi-larly, Ib. （Indole-3-b.tyric acid） was.the mos. efficient PGR in inducing root formation in the micros.oots. Media compos.tion and carb.n s.urce als. affected the regeneration efficiency. Ms.（Muras.ige and s.oog medium） proved to b. the b.s. media for regeneration followed b. b., s. （s.henk and Hilderb.andt medium） and WPM （Woody plant medium） in that order. s.milarly, among s.gars. only s.cros. and glucos. s.p-ported induction of micros.oots. b.s.d on this.s.udy we recommend the us. of glucos. in place of s.cros. in Ms.medium for maximum regenera-tion efficiency.

关键词： agrofores.ry micropropagation plant nutrition s.oot tipexplant timb.r plant Verb.naceae