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  • 1
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    Development of High Density MoO 3 Pellets for Production of 99 Mo Medical Isotope (2011)
    Institute of Physics (IOP)
    Details
    Publication Date: 2011-06-28
    Description: 99m Tc is the most widely used radioisotope in diagnostic radiopharmanceuticals. However, the supply of 99 Mo, the parent nuclide of 99m Tc, in Japan depends entirely on the import from foreign countries. Thus, it is necessary to supply 99 Mo stably by the domestic production, because of the unplanned shutdown and aged state of the foreign countries' reactors for 99 Mo production. Japan Atomic Energy Agency (JAEA) has a plan to produce 99 Mo. It is necessary that increasing of target volume for supplying 99 Mo stably. Pellets as irradiation target was studied. It is difficult to produce the pellets with high density, because MoO 3 sublimes at low temperature. In this study, MoO 3 pellets were produced by two kinds of production methods and characterization of these pellets were carried out. MoO 3 pellets were produced by the cold pressing sintering (CIP) method at first. Next, MoO...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Impacts of Interface Energies and Transformation Strain from BCC to FCC on Massive-like ?-? Transformation in Steel (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-06-12
    Description: Interface energies of ?/?, ?/?, ?/?, L/?, and L/? interfaces, at first, as a function of misorientation were evaluated with an aid of atomistic simulations with embedded atom method. Then, under geometric constraints where grains or interfaces compete each other to minimize overall free energy, effective interface energies for those interfaces were quantified. It is found that neither the minimum nor effective ?/? interface energies, 0.41 or 0.56 J/m 2 , respectively, is significantly higher than those of other interfaces including liquid/solid interfaces, but the ?/? interface energy is significantly high for the small entropy change upon ?-? massive-like transformation, resulting in significantly higher undercooling required for ? nucleation in the ? phase matrix than in solidification. Detachment of ?-phase dendrite tips away from ?-phase dendrite trunks can be explained only from a viewpoint of interface energy if small misorientationis introduced at the ?/? interfac...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    Molecular dynamics study on nano-sized wiredrawing: possible atomistic process and application to pearlitic steel wire (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-02-20
    Description: The process of nano-sized wiredrawing is investigated by using molecular dynamics (MD) simulation in this study. The authors have constructed novel computation models of wiredrawing, in which a single wire of just a several nanometers in diameter is smoothly drawn through a perfectly rigid die together with lubrication mechanism and is forced to be shaped into thinner one. Interatomic potentials used in MD simulation is a conventional pairwise type useable for iron-carbon binary system (for pearlitic steel). For MD model of pearlite steel wire, it is recognized that ferrite-cementite interface effectively offers high-speed diffusion path for carbon atoms from cementite side to ferrite side (elementary mechanism of cementite decomposition). As conclusion, we showed by using atomistic simulation that nano-sized wiredrawing process is theoretically quite possible.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
    Location Call Number Expected Availability
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    PAPER CURRENT
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