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Tsurumi, Miwa*; Enoto, Teruaki*; Ikkatai, Yuko*; Wu, T.*; Wang, D.*; Shinoda, Taro*; Nakazawa, Kazuhiro*; Tsuji, Naoki*; Diniz, G.*; Kataoka, Jun*; et al.
Geophysical Research Letters, 50(13), p.e2023GL103612_1 - e2023GL103612_9, 2023/07
Times Cited Count：0 Percentile：0(Geosciences, Multidisciplinary)Horiguchi, Naoki; Yoshida, Hiroyuki; Kitatsuji, Yoshihiro; Hasegawa, Makoto*; Kishimoto, Tadafumi*
Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 7 Pages, 2023/05
From the viewpoint of energy security in Japan and reduction of the environmental load, continuous operation of light water reactors is essential. Since a pH adjuster with enriched Li-7 ions is required for water quality control on PWR, the development of Li-7 enrichment technology is one of the key issues. The multi-channel counter-current electrophoresis (MCCCE) method has been developed as the technology with a low environmental load. To put this method into practical use, it is necessary to understand Li-7 ion behavior in the channel flow and optimize the experimental condition to separate Li-7 and its isotope. In this paper, to understand Li-7 ion behavior in a single channel of the experimental apparatus, a numerical simulation method based on a computational fluid dynamics (CFD) code with a particle tracking method, TPFIT-LPT, was developed. In the method, the motion of multiple ions under the electric field was simulated as a particle with an added velocity by the electric field. The difference in the isotopes was represented by changing of the magnitude of the added velocity. We also considered that although it is impossible to measure the behavior of each ion, it is important to measure the flow velocity of the bulk fluid for the validation of the numerical simulation. We developed a lab-scale experimental apparatus in which the single channel of the actual apparatus was simplified to measure the flow velocity by Particle Image Velocimetry (PIV). We set a pulsation flow condition on the lab-scale experiment, which is one of difficult conditions for the numerical simulation, and measured the velocity. As the result, we confirmed that the pulsation flow was reproduced. We set the measured data as the inlet boundary condition of the numerical simulation and conducted it. As the numerical result, we confirmed the ions affected by the electric field moved upstream with pulsation. We also confirmed the effect of the electric field on the motion of the isotope.
Sakuma, Hiroshi*; Tachi, Yukio; Yotsuji, Kenji; Suehara, Shigeru*; Arima, Tatsumi*; Fujii, Naoki*; Kawamura, Katsuyuki*; Honda, Akira
Clays and Clay Minerals, 65(4), p.252 - 272, 2017/08
Times Cited Count：2 Percentile：16.47(Chemistry, Physical)Structure and stability of montmorillonite edge faces (110), (010), (100), and (130) of the layer charges y = 0.5 and 0.33 are investigated by the first-principles electronic calculations based on the density functional theory. Stacking and single layer models are tested for understanding the effect of stacking on the stability of montmorillonite edge faces. Most stacking layers stabilize the edge faces by making hydrogen bonds between the layers; therefore, the surface energy of stacking layers is reduced rather than the single layer model. This indicates that the surface energy of edge faces should be estimated depending on the swelling conditions. Lowest surface energies of (010) and (130) edge faces were realized by the presence of Mg ions on the edge faces. These edge faces have a strong adsorption site for cations due to local negative charge of the edges.
Kimura, Hideo; Aoyagi, Tetsuo; Sato, Taiichi; Sakai, Manabu; Hikasa, Naoki*; Suzuki, Hitoshi; Tsuji, Minoru
JAEA-Technology 2011-027, 31 Pages, 2011/09
JAEA-Technology-2011-027.pdf:2.16MB
The financial accounting and contract management system of JAEA, built on a commercial ERP package, had suffered from serious problems of high lifecycle cost, poor response, and lack of extensibility, due to the too much customization to the ERP package, and disorganized software structure. To solve those problems, three approaches were applied; (1) conducting thorough analysis of business flow and fit/gap, which enabled removing all customization brought to the ERP package; (2) dividing the system into subsystems, and clearly defining interfaces between the subsystems, which increases the transparency, extensibility and performance of the system; (3) outsourcing the development of the subsystems to multiple venders to reduce the development cost. Those approaches can be useful for developing business information systems using commercial software to save time and cost, while meeting the unique requirements of an organization.
Fe
O
F
(x 
0.44)Tsujimoto, Yoshihiro*; Yamaura, Kazunari*; Hayashi, Naoaki*; Kodama, Katsuaki; Igawa, Naoki; Matsushita, Yoshitaka*; Katsuya, Yoshio*; Shirako, Yuichi*; Akaogi, Masaki*; Muromachi, Eiji*
Chemistry of Materials, 23(16), p.3652 - 3658, 2011/08
Times Cited Count：27 Percentile：61(Chemistry, Physical)Topotactic reaction of the Ruddlesden-Popper phase SrFeO
(
0.18) with polytetrafluoroethylene yields a highly fluorinated phase SrFeOF (x 0.44), compared with SrFeO
F
prepared by the reaction of SrFeO and F gas. Structure analyses based on powder neutron diffraction, synchrotron powder diffraction, and 
Fe M
ssbauer spectroscopy measurements demonstrate that the new oxyfluoride perovskite has no anion deficiencies and adopts the tetragonal structure (space group 
4/
) with lattice constants 
= 3.87264(6) 
and 
= 21.3465(6) at room temperature. The fluoride ions preferentially occupy the terminal apical anion sites with oxide ions in a disordered manner, which results in square pyramidal coordination around iron.
Al superconductors for ITER*; Yamada, Yuichi*; *; Ito.M*; *; *; Koizumi, Norikiyo; Ando, Toshinari; Matsui, Kunihiro; Sugimoto, Makoto; et al.
IEEE Transactions on Applied Superconductivity, 9(2), p.2688 - 2691, 1999/06
Times Cited Count：4 Percentile：36.4(Engineering, Electrical & Electronic)no abstracts in English
Al superconductors for International Thermonuclear Experimental Reactor (ITER)Yamada, Yuichi*; *; *; *; *; *; *; Koizumi, Norikiyo; Ando, Toshiro; Matsui, Kunihiro; et al.
Cryogenics, 39(2), p.115 - 122, 1999/00
Times Cited Count：39 Percentile：82.96(Thermodynamics)no abstracts in English
Al conductor for toroidal coils of fusion reactorsKoizumi, Norikiyo; Ando, Toshinari; Sugimoto, Makoto; Takahashi, Yoshikazu; Tsuji, Hiroshi; Shimamoto, Susumi; Yamada, Yuichi*; *; *
Fusion Engineering and Design, 41, p.277 - 281, 1998/00
Times Cited Count：9 Percentile：60.32(Nuclear Science & Technology)no abstracts in English
Al superconducting wires*; *; Yamada, Yuichi*; *; *; Koizumi, Norikiyo; Ando, Toshinari; Sugimoto, Makoto; Tsuji, Hiroshi; Okuno, Kiyoshi; et al.
IEEE Transactions on Applied Superconductivity, 7(2), p.1564 - 1567, 1997/06
Times Cited Count：7 Percentile：52.54(Engineering, Electrical & Electronic)no abstracts in English
Sugikawa, Susumu; ; ; Nakazaki, Masato; Shirahashi, Koichi; ; *; *; Tsuji, Kenichi*; Tachimori, Shoichi; et al.
JAERI-Tech 97-007, 86 Pages, 1997/03
no abstracts in English
Al/Cu multifilamentary superconducting strand*; *; Yamada, Yuichi*; *; *; Koizumi, Norikiyo; Sugimoto, Makoto; Ando, Toshinari; Tsuji, Hiroshi; Shimamoto, Susumi
Proc. of 16th Int. Cryogenic Engineering Conf. /Int. Cryogenic Materials Conf., 0, p.1673 - 1676, 1996/00
no abstracts in English
Al superconducting wires*; *; Yamada, Yuichi*; *; *; Koizumi, Norikiyo; Ando, Toshinari; Sugimoto, Makoto; Tsuji, Hiroshi; Shimamoto, Susumi
Proc. of 16th Int. Cryogenic Engineering Conf. /Int. Cryogenic Materials Conf., 0, p.1677 - 1680, 1996/00
no abstracts in English
Tsujino, Takeshi; Naito, Yoshitaka; Maeda, Mitsuru; ; Hoshi, Michio; Izawa, Naoki; Takeshita, Isao; ; Okazaki, Shuji; Dojiri, Shigeru
Genshiryoku Kogyo, 40(5), p.9 - 59, 1994/00
no abstracts in English
Tsujino, Takeshi; Takeshita, Isao; Izawa, Naoki;
Topical meeting,Safety of the Nuclear Fuel Cycle, 0, p.124 - 137, 1994/00
no abstracts in English
Hayafune, Hiroki; Aizawa, Kosuke; Tsujita, Yoshihiro*; Morita, Hideyuki*; Sawa, Naoki*
no journal, ,
no abstracts in English
Kitazawa, Hideaki*; Kawamura, Yukihiko*; Mamiya, Hiroaki*; Terada, Noriki*; Suzuki, Hiroyuki*; Tsujii, Naohito*; Doenni, A.*; Kaneko, Koji; Metoki, Naoto; Igawa, Naoki; et al.
no journal, ,
In this paper, we will demonstrate some application of neutron scattering for magnetic refrigerant materials Ho
Pd
and dilute spinel ferrites. In order to determine the magnetic structure, we have performed neutron powder diffraction experiments at JRR-3. The magnetic peaks with a propagation vector k = (0.18, 0.18, 0.18) are gradually developing. The peak width is significantly broader even 5 K, indicating a short-range order with a long wave length.
Tsujimoto, Yoshihiro*; Yamaura, Kazunari*; Matsushita, Yoshitaka*; Muromachi, Eiji*; Hayashi, Naoaki*; Kodama, Katsuaki; Igawa, Naoki; Shirako, Yuichi*; Akaogi, Masaki*
no journal, ,
Topotactic reaction of the n = 2 Ruddlesden-Popper phase SrFeO with the Teflon polymer yields a highly fluorinated phase SrFeOO (x 
0.44). The crystal/magnetic structures and anion composition are determined by a combination of neutron diffraction and Fe Mssbauer spectroscopy experiments. Fluoride anions selectively occupy the terminal apical anion sites, leading to the square pyramidal coordination around the Fe metal center. The oxyfluoride material adopts a simple antiferromagnetic ordered structure with k = (1/2 1/2 0) below 390 K.
InO
as electrolyte for solid oxide fuel cell analyzed by EXAFS and neutron powder diffractionIgawa, Naoki; Kodama, Katsuaki; Taguchi, Tomitsugu*; Tsuji, Takuya; Matsumura, Daiju; Yoshii, Kenji
no journal, ,
The local structure of BaSnInO which is one of the excellent solid electrolytes for solid oxide fuel cells was analyzed by using the X-ray absorption spectroscopy followed the neutron diffraction. The average crystal structure analyzed by the neutron diffraction shows that BaSnInO has the space group, 
-3
and the Sn and In randomly occupy at same site. However, the result of Extended X-ray Absorption Fine Structure shows that the distance of In-O and Sn-O is different. In addition, the In-O distance is increased by the hydrogen doping while the Sn-O distance does not change. Those results suggest that the Sn and In occupy different sites and therefore the local structural distortion has occurred. In this work, the details of the local structure of BaSnInO will be discussed.
Horiguchi, Naoki; Yoshida, Hiroyuki; Kitatsuji, Yoshihiro; Fukumori, Mai*; Takemura, Yuki*; Hasegawa, Makoto*; Kishimoto, Tadafumi*
no journal, ,
no abstracts in English
