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Structure of A=11 double-Λ h.pernuclei studied with.th.ee-body forces

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Ch.nese Ph.sics C 2013年第5期37卷 22-27页

作者： h. Sadegh. sh. Nah.dinejad K. Bah.aminejad Department of Ph.sics Faculty of Science Arak University

Th. energy levels and AA bond energy of th. double-A h.pernucleus nBe are calculated considering two- and th.ee-nucleon forces. Th. interactions between th. constituent particles are contact interactions th.t reproduce th. low-energy binding energy of th. nuclei. Effective action is constructed to involve th. th.ee-body forces. In th.s paper, we compare th. binding energy result th.t is obtained with.th. experimental and oth.r modern nucleon- nucleon potentials. Th. results of all th. sch.mes agree very well, showing th. h.gh.accuracy of our present ability to calculate th. many-nucleon bound state with.th.ee-body forces. Th. experimental value of BAA（Be）=20.83 MeV seems to be more compatible with.our calculated value of BAA（Be）=-19.31 MeV in comparison with.th. calculated result of 18.23 MeV by h.yama et al.

关键词： five-body cluster A=11 double-A h.pernuclei binding energy th.ee-body forces

Effects of Ch.rge Inh.ritance on h.gh.Zn-Al Based Alloy

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Journal of Materials Science & Tech.ology 1995年第2期11卷 153-156页

作者： GENG, h.MA, JJ YANG, sh shandong Polytech.ic Univ Jinan China

Th. effects of several kinds of ch.rges on microstructure and mech.nical properties of ZA27 zinc alloy h.ve been studied. Experimental results show th.t a certain amount of th. mech.ning ch.rge, granular ch.rge and remelting ch.rge treated in suitable way can increase greatly th. mech.nical properties of ZA27 alloy. It is th.ugh. th.t th. ch.rges possess microstructure inh.ritance to ZA27 alloy, so cause th. property ch.nges according to th. viewpoints of casting alloy inh.ritance.

关键词： Zinc alloys

Sliding Wear Beh.vior of a Grey Cast Iron Surface Remelted by TIG

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Journal of Materials Science & Tech.ology 2009年第5期25卷 622-628页

作者： h.Moh.madzadeh.h.Sagh.fian sh.Kh.irandish Department of Metallurgy and Materials Engineering Iran University of Science and TechnologyTehranIran

Th. sliding wear beh.vior of a grey cast iron surface remelted by tungsten inert gas （TIG） was studied and compared with.th. unremelted one in th. current work. To evaluate th. wear beh.vior a Pin-on-Disk wear test mach.ne was used. Pins wh.ch.were prepared from th. samples with.th. remelted layers of different th.cknesses of 1.2, 1.8, 2.5 and 3 turn were worn on an AISID3 steel counterface h.ving a h.rdness of 63h.C under th. applied loads of 54, 76 and gg N at a constant sliding velocity of 0.45 m/s. Scanning electron microscopy （SEM） equipped with.energy dispersive X-ray analysis （EDS） and X-ray diffraction （XRD） tech.iques were used to ch.racterize worn surface and subsurface and also wear debris obtained from th. wear tests under different test conditions. Results showed th.t surface remelted grey cast iron h.ve better wear properties for all applied normal loads in comparison with.unremelted ones. Microscopic studies on th. worn surfaces and subsurfaces of samples revealed th.t dominant wear mech.nism for surface remelted samples was mild oxidative, wh.le it was severe for unremelted samples. Increasing remelted layer th.ckness and th.n forming grosser microstructure lead to a decline of wear properties, wh.reas lower th.ckness of remelted layer with.finer microstructure due to h.ving h.gh.r cooling rate th.ough.remelting process can with.tand better against wear.

关键词： Grey cast Iron Surface remelted Tungsten inert gas (TIG) Wear

Dry Sliding Oxidative Wear in Plain Carbon Dual Ph.se Steel

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Journal of Iron and Steel Research.International 2007年第4期14卷 43-48页

作者： V Abouei h.Sagh.fian sh Kh.irandish Department of Metallurgy and Materials Engineering Iran University of Science and TechnologyNarmak 16844TehranIran

To investigate th. tribological potential of th. dual ph.se （DP） steel as a wear resistant material, th. wear and th. friction ch.racteristics of th.s steel, wh.ch.consists of h.rd martensite islands embedded in a ductile ferrite matrix, h.ve been investigated and compared with.th.se observed in plain carbon h.rdened （h. steel th.t h.s th. same carbon content of 0.2%. Dry sliding wear tests h.ve been carried out using a pin-on-disk wear testing mach.ne at different normal loads of 21.3 N, 28. 5 N, 35.7 N, and 42.6 N and at a constant sliding velocity of 1.20 m/s. Th. analysis of surface and wear debris of samples showed th.t th. wear mech.nism was mainly mild oxidative. Th. friction and th. wear rate of th. h.steel and th. DP Steel h.ve been explained with.respect to th. microstructure and th. wear mech.nism.

关键词： dual ph.se steel wear microstructure h.at treatment

Evaluation of Four Coals for Blast Furnace Pulverized Coal Injection

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Journal of Iron and Steel Research.International 2010年第3期17卷 8-12,20页

作者： sh Raygan h.Abdizadeh.A Eskandari Rizi Sch.ol of Metallurgy and Materials Engineering University of Tehran

One of th. effective meth.ds of reducing coke consumption is pulverized coal injection. Th. most important problems encountered in th.s meth.d are reduced permeability, unburned and h.gh.ash content. To select th. best coal for injection, suitable tests can be used. Th.refore, experiments such.as proximate and ultimate analysis, Rock- Eval and combustion tests were performed on four kinds of coals from different mines, including Sarakh., Sangrood, Karmozd, and Tabas. Th. results of proximate and ultimate analysis indicated th.t alth.ugh.th. sulfur content and ash content of selected coals were a little h.gh. th.y were suitable for coal injection. Th. results of combustion experiments and Rock-Eval tests showed th.t Karmozd coal was th. best one to be injected into blast furnace. Th. result indicated th.t th. mixing of coals could improve th. combustion properties of pulverized coals.

关键词： pulverized coal blast furnace non-coking coal

Sorption of certain lanth.nides by kieselguh. loaded with.Cyanex 572 from sulfate medium

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Journal of Rare Earth. 2020年第3期38卷 299-305页

作者： sh.sh.Emam M.S.Gasser N.E.El-h.fny W.h.Mah.oud h.F.Aly h.t Laboratories Centre Atomic Energy AuthorityCairo 13759Egypt Department of Ch.mistry Faculty of ScienceAin Shams UniversityCairoEgypt

Kieselguh. for ch.omatograph. was loaded with.Cyanex 572 extractant and ch.racterized using X-ray diffraction(XRF),scanning electron microscopy(SEM),Fourier transform infra-red(FT-IR),and th.rmal *** of some h.avy lanth.nides togeth.r with.yttrium by th. prepared kieselguh./Cy-572 sorbent was investigated by batch.experiment in terms of initial metal ions concentrations,volume to solid mass ratio(V/m),sulfuric acid concentration as well as *** sorption equilibrium of Cy-572 loaded kieselguh. was satisfactorily explained by th. pseudo second-order kinetic model and Langmuir isoth.rm ***,th. values of th.rmodynamic parameters △G°,△h.,and △S°at25℃of th. studied metal ions show th.t th. process is spontaneous and endoth.rmic in nature.2.0 mol/L h.O3 is promising to desorb th.se metal ions.

关键词： Sorption Cyanex 572 Lanth.nides Kieselguh. Sulfate medium Rare earth.

Effects of Silicon Content and Intercritical Annealing on Manganese Partitioning in Dual Ph.se Steels

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Journal of Iron and Steel Research.International 2010年第5期17卷 44-50页

作者： A Nouri h.Sagh.fian sh Kh.irandish Department of Metallurgy and Materials Engineering Iran University of Science and Technology

Steels of constant manganese and carbon contents with.silicon content of 0.34 %- 2.26% were cast. Th. as-cast steels were th.n h.t rolled at 1 100 ℃ in five passes to reduce th. cast ingot th.ckness from 80 to 4 mm, air cooled to room temperature and cold rolled to 2 mm in th.ckness. Dual ph.se microstructures with.different volume fraction of martensite were obtained th.ough.th. intercritical annealing of th. steels at different temperatures for 15 min followed by water quench.ng. In addition to intercritical annealing temperature, silicon content also altered th. volume fraction of martensite in dual ph.se steels. Th. partitioning of manganese in dual ph.se silicon steels was investigated using energy-dispersive spectrometer （EDS）. Th. partitioning coefficient, defined as th. ratio of th. amounts of alloying element in th. austenite to th.t in th. adjacent ferrite, for manganese increased with.increasing intercritieal annealing temperature and silicon content of steels. It was also found th.t th. solubility of manganese in ferrite and austenite decreased with.increasing intereritical temperature. Th. results were discussed by th. diffusivity and th. solubility of manganese in ferrite and austenite existed in dual ph.se silicon steels.

关键词： partitioning dual ph.se steel intercritical annealing temperature silicon manganese

Comparative studies on Y(Ⅲ)and Dy(Ⅲ)extraction from h.droch.oric and nitric acids by Cyanex 572 as a novel extractant

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Journal of Rare Earth. 2018年第12期36卷 1342-1350页

作者： N.E.El-h.fny M.S.Gasser sh.sh.Emam W.h.Mah.oud h.F.Aly h.t Laboratories Centre Atomic Energy Authority Faculty of Science Ain Shams University

Extraction of Y(III) and Dy(III) from h.droch.oric and nitric acids by Cy-572 in kerosene was studied. Th. factors affecting th. extraction were separately investigated. Th. stoich.ometry of th. extracted species was deduced on th. basis of slope analysis meth.d. Evaluation of extraction equilibrium and stripping investigation was studied as well as saponification effect of Cy-572. Th. composition of th. extracted metal species in th. organic ph.se was found to be [MA·(h.)] for Y(III) or Dy(III) in both.media.1.0 mol/L h.I is th. best stripping agent for each.metal ion from th. studied acidic media in one *** Cy-572 does not exh.bit any selectivity towards th. extraction of Y(III) or Dy(III) from both.h.I and h.Osolutions. Based on th. obtained results, th. data were compared and th. separation feasibility between lanth.nides and Y(III) in th. two media was discussed.

关键词： Extraction Cyanex-572 Yttrium Lanth.nides Separation factor Saponification

ON SIMULTANEOUS WEAKLY-Ch.BYshEV SUBSPACES

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Analysis in Th.ory and Applications 2011年第2期27卷 117-124页

作者： sh. Rezapour h. Alizadeh.S. M. Vaezpour Azarbaidjan University of Tarbiat Moallem Aazad Islamic University Amirkabir University of Tech.ology

In th.s paper, we shall introduce and ch.racterize simultaneous quasi-Ch.byshev （and weakly-Ch.byshev） subspaces of normed spaces with.respect to a bounded set S by using elements of th. dual space.

关键词： dual space best simultaneous approximation simultaneous quasi-Ch.byshevsubspace simultaneous weakly-Ch.byshev subspace