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Hirooka, Shun; Horii, Yuta; Sunaoshi, Takeo*; Uno, Hiroki*; Yamada, Tadahisa*; Vauchy, R.; Hayashizaki, Kohei; Nakamichi, Shinya; Murakami, Tatsutoshi; Kato, Masato
Journal of Nuclear Science and Technology, 60(11), p.1313 - 1323, 2023/11
Times Cited Count：5 Percentile：89.01(Nuclear Science & Technology)Additive MOX pellets are fabricated by a conventional dry powder metallurgy method. Nd
O
and SmO are chosen as the additive materials to simulate the corresponding soluble fission products dispersed in MOX. Shrinkage curves of the MOX pellets are obtained by dilatometry, which reveal that the sintering temperature is shifted toward a value higher than that of the respective regular MOX. The additives, however, promote grain growth and densification, which can be explained by the effect of oxidized uranium cations covering to a pentavalent state. Ceramography reveals large agglomerates after sintering, and Electron Probe Micro-Analysis confirms that inhomogeneous elemental distribution, whereas XRD reveals a single face-centered cubic phase. Finally, by grinding and re-sintering the specimens, the cation distribution homogeneity is significantly improved, which can simulate spent nuclear fuels with soluble fission products.
Norisue,Tomohisa*; Kida, Yusuke*; Masui, Naoki*; Tran-Cong-Miyata, Q.*; Maekawa, Yasunari; Yoshida, Masaru; Shibayama, Mitsuhiro*
Macromolecules, 36(16), p.6202 - 6212, 2003/08
Times Cited Count：77 Percentile：89.27(Polymer Science)The shrinking kinetics of poly(N-isopropylacrylamide) (PNIPA) gels has been studied for two types of PNIPA gels prepared by (i) copolymerization of constituent monomer and cross-linker and (ii) 
-ray irradiation in the PNIPA solutions in order to investigate the role of cross-linking on shrinking kinetics. The shrinking kinetics of the monomer cross-linked gels is quite similar to that of the polymer cross-linked gels. On the other hand, a significant difference was found when the microscopic structure and the dynamics were investigated by small-angle neutron scattering (SANS) and static/dynamic light scattering (SLS/DLS). The degree of built-in inhomogeneities and dynamic fluctuations were evaluated as a function of the cross-linking degree and the gel preparation temperature by intensity decomposition methods for both types of gels. It is concluded that the monomer cross-linked gels have extra built-in inhomogeneities due to the spatial distribution of crosslinks in addition to the frozen concentration fluctuations inherent in polymer gels.
Working Group on Nuclear Criticality Satety Data
JAERI 1340, 189 Pages, 1999/03
no abstracts in English
;
Proc. of PATRAM'98, 1, p.217 - 223, 1998/00
no abstracts in English
Okuno, Hiroshi; Naito, Yoshitaka;
Journal of Nuclear Science and Technology, 31(9), p.986 - 995, 1994/09
Times Cited Count：2 Percentile：27.85(Nuclear Science & Technology)no abstracts in English
Spectrochimica Acta, Part A, 46(10), p.1461 - 1473, 1990/00
no abstracts in English
Journal of Chemical Physics, 85(10), p.5882 - 5889, 1986/10
Times Cited Count：3 Percentile：17.91(Chemistry, Physical)no abstracts in English
Journal of Chemical Physics, 84(3), p.1670 - 1676, 1986/00
Times Cited Count：2 Percentile：12.84(Chemistry, Physical)no abstracts in English
Journal of Chemical Physics, 82(2), p.860 - 867, 1985/00
Times Cited Count：2 Percentile：14.92(Chemistry, Physical)no abstracts in English
Journal of Chemical Physics, 80(4), p.1556 - 1561, 1984/00
Times Cited Count：6 Percentile：28.85(Chemistry, Physical)no abstracts in English
) reactions in binary organic systems containing bromine, IZ.ABEDINZADEH*; S.GRILLET*; J.STEVOVIC*; Tanaka, Kichizo; M.MILMAN*
Radiochimica Acta, 9(4), p.38 - 40, 1968/00
no abstracts in English
Tanaka, Kichizo; Stevovic, J.*; Milman, M.*
Journal of Inorganic and Nuclear Chemistry, 3, p.415 - 418, 1967/00
no abstracts in English
