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Journal Articles

Analysis on cooling behavior for simulated molten core material impinging to a horizontal plate in a sodium pool

Matsushita, Hatsuki*; Kobayashi, Ren*; Sakai, Takaaki*; Kato, Shinya; Matsuba, Kenichi; Kamiyama, Kenji

Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Operation and Safety (NUTHOS-13) (Internet), 9 Pages, 2022/09

During core disruptive accidents in sodium-cooled fast reactors, the molten core material flows through flow channels, such as the control rod guide tubes, into the core inlet plenum under the core region. The molten core material can be cooled and solidified while impinging on a horizontal plate of the inlet plenum in a sodium coolant. However, the solidification and cooling behaviors of molten core materials impinged on a horizontal structure have not been sufficiently studied thus far. Notably, this is an important phenomenon that needs to be elucidated from the perspective of improving the safety of sodium-cooled fast reactors. Accordingly, a series of experiments on discharging a simulated molten core material (alumina: Al$$_{2}$$O$$_{3}$$) into a sodium coolant on a horizontal structure was conducted at the experimental facility of the National Nuclear Center of the Republic of Kazakhstan. In this study, analyses on the sodium experiments using SIMMER-III as the fast reactor safety evaluation code were performed. The analysis methods were validated by comparing the results and experiment data. In addition, the cooling and solidification behaviors during jet impingement were evaluated. The results indicated that the molten core material exhibited fragmentation owing to the impingement on the horizontal plate and was, therefore, scattered toward the periphery. Furthermore, the simulated molten core material was evaluated to be cooled by sodium and subsequently solidified.

Journal Articles

New antiferromagnetic order with pressure-induced superconductivity in EuFe$$_2$$As$$_2$$

Ikeda, Shugo*; Tsuchiya, Yu*; Zhang, X.-W.*; Kishimoto, Shunji*; Kikegawa, Takumi*; Yoda, Yoshitaka*; Nakamura, Hiroki; Machida, Masahiko; Glasbrenner, J.*; Kobayashi, Hisao*

Physical Review B, 98(10), p.100502_1 - 100502_6, 2018/09

 Times Cited Count:4 Percentile:26.51(Materials Science, Multidisciplinary)

The interplay between magnetism and superconductivity is one of important subjects to investigate the pairing mechanism in novel superconductors. We have found new coexistence between an antiferromagnetic order in the Fe sublattice and superconductivity of the FeAs-based EuFe$$_2$$As$$_2$$ superconductor in the pressure range from 2.4 to 3.0 GPa by $$^{57}$$Fe nuclear forward scattering (NFS) using a single crystal sample. The magnetic state in the Fe sublattice changes to a new antiferromagnetic one with superconductivity from a stripe-type antiferromagnetic one observed in normal conducting state at 2.7 GPa. Below the superconducting transition temperature, the temperature dependence of $$^{57}$$Fe NFS spectra reveals that the new antiferromagnetic order develops with the superconductivity. This non-trivial coupling of two ordered states in EuFe$$_2$$As$$_2$$ under pressure demonstrates a new and intriguing relationship between magnetism and superconductivity in Fe-based superconductors.

Journal Articles

Fine dispersion of Pt$$_{4-5}$$ subnanoclusters and Pt single atoms over porous carbon supports and their structural analyses with X-ray absorption spectroscopy

Itoi, Hiroyuki*; Nishihara, Hirotomo*; Kobayashi, Shunsuke*; Ittisanronnachai, S.*; Ishii, Takafumi*; Berenguer, R.*; Ito, Masashi*; Matsumura, Daiju; Kyotani, Takashi*

Journal of Physical Chemistry C, 121(14), p.7892 - 7902, 2017/04

 Times Cited Count:30 Percentile:72.44(Chemistry, Physical)

Journal Articles

Process of ${it in vivo}$ cyst formation from the implanted larval integument in the sweet potato hornworm, ${it Agrius convolvuli}$; A Simple model for studying wound healing

Fukamoto, Kana; Shirai, Koji*; Sato, Shigeru*; Kanekatsu, Rensuke*; Kiguchi, Kenji*; Kobayashi, Yasuhiko

Journal of Insect Biotechnology and Sericology, 75(3), p.99 - 106, 2006/10

no abstracts in English

Journal Articles

Effects of heavy-ion irradiation on the differentiation of epidermal cells in the silkworm, ${it Bombyx mori}$

Fukamoto, Kana; Shimura, Sachiko*; Shirai, Koji*; Kanekatsu, Rensuke*; Kiguchi, Kenji*; Sakashita, Tetsuya; Funayama, Tomoo; Kobayashi, Yasuhiko

Journal of Insect Biotechnology and Sericology, 75(3), p.107 - 114, 2006/10

no abstracts in English

Journal Articles

Contribution of circulating hemocytes to the regeneration of heavy ion beams ($$^{12}$$C$$^{5+}$$) irradiated hematopoietic organs in the silkworm, ${it Bombyx mori}$, through the way of phagocytosis of injured cells after invasion

Ling, E.*; Shirai, Koji*; Kanekatsu, Rensuke*; Kiguchi, Kenji*; Kobayashi, Yasuhiko; Funayama, Tomoo; Watanabe, Hiroshi*

Developmental and Comparative Immunology, 30(6), p.531 - 543, 2006/00

 Times Cited Count:13 Percentile:54.55(Fisheries)

no abstracts in English

Journal Articles

Regeneration of hemopoietic organs in the silkworm, ${it bombyx mori}$, after locally targeted irradiation with heavy ion beams

Ling, E.*; Fukamoto, Kana*; Xu, S.*; Shirai, Koji*; Kanekatsu, Rensuke*; Kobayashi, Yasuhiko; Tu, Z.; Funayama, Tomoo; Watanabe, Hiroshi; Kiguchi, Kenji*

Journal of Insect Biotechnology and Sericology, 72(2), p.95 - 100, 2003/09

no abstracts in English

Journal Articles

Why does hemocyte density rise during the wandering stage of the silkworm, ${it bombyx mori}$?

Ling, E.*; Shirai, Koji*; Kanekatsu, Rensuke*; Kobayashi, Yasuhiko; Tu, Z.; Funayama, Tomoo; Watanabe, Hiroshi; Kiguchi, Kenji*

Journal of Insect Biotechnology and Sericology, 72(2), p.101 - 109, 2003/09

no abstracts in English

Journal Articles

The Standard molar enthalpy of formation of UNCl

Akabori, Mitsuo; Kobayashi, Fumiaki; Hayashi, Hirokazu; Ogawa, Toru; Huntelaar, M. E.*; Booij, A. S.*; Vlaanderen, P. van*

Journal of Chemical Thermodynamics, 34(9), p.1461 - 1466, 2002/09

 Times Cited Count:0 Percentile:0.02(Thermodynamics)

no abstracts in English

Journal Articles

Fate mapping of the cellular blastoderm stage egg of the silkworm, ${{it Bombyx mori}}$, by localized irradiation of heavy ion microbeams

Kiguchi, Kenji*; Kinjo, Y.*; Masahashi, K.*; Tu, Z.; Tamura, Hajime*; Shirai, K.*; Kanekatsu, Rensuke*; Kobayashi, Yasuhiko; Taguchi, Mitsumasa; Watanabe, Hiroshi

JAERI-Review 2000-024, TIARA Annual Report 1999, p.51 - 53, 2000/10

no abstracts in English

Journal Articles

Effects of local irradiation of heavy ion beams to the hematopoietic organs of the silkworm, Bombyx mori

Tu, Z. L.*; Shirai, Koji*; Kanekatsu, Rensuke*; Kiguchi, Kenji*; Kobayashi, Yasuhiko; Taguchi, Mitsumasa; Watanabe, Hiroshi

Nihon Sanshigaku Zasshi, 68(6), p.491 - 500, 1999/00

no abstracts in English

Journal Articles

Effects of general and local irradiation of heavy ion beams on the development and morphogenesis of the silkworm, Bombyx mori

Tu, Z. L.*; Yamasaki, Shuhei*; Shirai, Koji*; Kanekatsu, Rensuke*; Kiguchi, Kenji*; Kobayashi, Yasuhiko; Taguchi, Mitsumasa; Watanabe, Hiroshi

Nihon Sanshigaku Zasshi, 68(6), p.443 - 453, 1999/00

no abstracts in English

Oral presentation

Studies on relocation behavior of molten core materials in the core disruptive accident of sodium-cooled fast reactors, 10; Analysis on fragmentation and cooling behavior in a limited volume sodium pool

Matsushita, Hatsuki*; Kobayashi, Ren*; Sakai, Takaaki*; Kato, Shinya; Matsuba, Kenichi; Kamiyama, Kenji

no journal, , 

no abstracts in English

Oral presentation

Preparation of multiply fused phenanthroline derivatives employing catalytic C-H arylation and the highly selective extraction of lanthanoids

Asano, Towa*; Kobayashi, Toru; Shimojo, Kojiro; Yamaoka, Seiha*; Torii, Ren*; Okano, Kentaro*; Yaita, Tsuyoshi; Mori, Atsunori*

no journal, , 

no abstracts in English

14 (Records 1-14 displayed on this page)
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