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Otsuka, Yusuke*; Kanazawa, Naoya*; Hirayama, Motoaki*; Matsui, Akira*; Nomoto, Takuya*; Arita, Ryotaro*; Nakajima, Taro*; Hanashima, Takayasu*; Ukleev, V.*; Aoki, Hiroyuki; et al.
Science Advances (Internet), 7(47), p.eabj0498_1 - eabj0498_9, 2021/11
Kawasaki, Kohei; Shinada, Kenta; Okamoto, Naritoshi; Kageyama, Tomio; Eda, Takashi; Okazaki, Hiro; Suzuki, Hiromichi; Yamamoto, Kazuya; Otabe, Jun
JAEA-Technology 2020-025, 80 Pages, 2021/03
JAEA-Technology-2020-025.pdf:3.72MB
Plutonium Fuel Production Facility was built in 1988 for the purpose of mainly producing MOX fuel of the prototype fast breeder reactor MONJU, and large glove boxes were installed for handling unsealed nuclear fuel material remotely. The panels of these glove boxes are made of acrylic, except for those installed after December 2013. For fires inside the glove box, automatic fire extinguishing systems using halides have been introduced since the beginning of construction, but for fires outside the glove box, there have been issues with direct measures for acrylic. Therefore, we have developed a fireproof sheet that mitigates the effect of fire outside the glove box on the panels as much as possible. As a result, fire-retardant sheets have been selected and attached to the glove box panels. We conducted a flammability test of the acrylic plate attached with these fireproof sheets and a usage environment influence test of fireproof sheets, and obtained good results. In addition, we set up a working group in the Plutonium Fuel Development Center in view of reducing external exposure during the work of attaching fireproof sheets, in which we discussed and examined the work procedure, and summarized it in the basic procedure manual.
; A 
Ge-nuclear-quadrupole-resonance study under pressureHarada, Atsushi*; Kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*
Physical Review B, 75(14), p.140502_1 - 140502_4, 2007/04
Times Cited Count：27 Percentile：73.37(Materials Science, Multidisciplinary)This paper reports that a different type of superconducting order parameter has been realized in the ferromagnetic states in UGe via Ge-nuclear-quadrupole-resonance experiments performed under pressure. Measurements of the nuclear spin-lattice relaxation rate (1/
) have revealed an unconventional nature of superconductivity such that the up-spin band is gapped with line nodes, but the down-spin band remains gapless at the Fermi level. This result is consistent with that of a ferromagnetic spin-pairing model in which Cooper pairs are formed among ferromagnetically polarized electrons. The present experiment has shed light on the possible origin of ferromagnetic superconductivity, which is mediated by ferromagnetic spin-density fluctuations relevant to the first-order transition inside the ferromagnetic states.
; Ge-NQR study under pressureHarada, Atsushi*; kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*
Physica B; Condensed Matter, 378-380, p.963 - 964, 2006/05
Times Cited Count：1 Percentile：7.01(Physics, Condensed Matter)The superconducting characteristics on the itinerant ferromagnetic superconductor UGe have been investigated via the Ge-NQR measurements under pressure (
) near the critical pressure 
where the first-order transition takes place from the low-temperature () and low- ferromagnetic phase (FM2) to high- and high- one (FM1). The measurements of nuclear spin-lattice relaxation rate 
have revealed a power-law like behavior as 
without the coherence peak, whereas at low temperatures, it deviates from the dependence to a -linear like behavior. These results that depend on the pressure are well understood in terms of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2.
; A Ge-NQR study under pressureHarada, Atsuyuki*; Kawasaki, Shinji*; Kotegawa, Hisashi*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*
Journal of the Physical Society of Japan, 74(10), p.2675 - 2678, 2005/10
Times Cited Count：20 Percentile：69.81(Physics, Multidisciplinary)no abstracts in English
Sr
MnO
Kajimoto, Ryoichi; Yoshizawa, Hideki*; Kawasaki, Ryuichi*; Noda, Kohei*; Kuwahara, Hideki*
Journal of the Physical Society of Japan, 74(1), p.502 - 503, 2005/01
Times Cited Count：1 Percentile：12.06(Physics, Multidisciplinary)The spin wave dispersion relation of the C-type antiferromagnetic structure in Nd
Sr
MnO was determined by neutron scattering. The spin exchange interactions show a large anisotropy, which evidences the d
orbital ordering along the 
axis. The exchange interaction along the direction is fairly large and similar to the value in the ferromagnetic metallic phase, suggesting there is finite hopping of charges along the orbital chains.
-ray irradiation on mechanical strength of polycarbonate materialKawasaki, Kohei
no journal, ,
no abstracts in English
Shinada, Kenta; Kawasaki, Kohei; Makino, Takayoshi; Okamoto, Naritoshi
no journal, ,
no abstracts in English
Kawasaki, Kohei; Shinada, Kenta; Makino, Takayoshi; Okamoto, Naritoshi
no journal, ,
no abstracts in English
Yoshida, Tadayoshi; Isozaki, Kohei; Tamura, Ken; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro
no journal, ,
no abstracts in English
Tamura, Ken; Isozaki, Kohei; Yoshida, Tadayoshi; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro
no journal, ,
no abstracts in English
Isozaki, Kohei; Tamura, Ken; Yoshida, Tadayoshi; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro
no journal, ,
no abstracts in English
Yoshida, Masato; Kawasaki, Kohei; Aita, Takahiro; Tsubota, Yoichi; Kikuchi, Ryo*; Honda, Fumiya
no journal, ,
no abstracts in English
Kawasaki, Kohei
no journal, ,
no abstracts in English
小野 高徳; 山口 文吾; 川崎 浩平
not registered
JP, 2013-107547 Patent licensing information Patent publication (In Japanese)
【課題】本発明は、漏電遮断器に配設されているテストボタンを人が誤って動作させることを防止する漏電遮断器のテストボタン誤操作防止カバーおよびそれを用いた漏電遮断器を提供する 【解決手段】漏電遮断器に配設されたテストボタンに指や物品が接触することを防止するテストボタンカバーであって、該テストボタンカバーには、漏電遮断器のテストボタンに相対する位置に、専用の工具でテストボタンを動作させることを可能とする小径で、かつ、貫通したテストボタン押下げ用穴を有するテストボタンカバーである。また、該テストボタンカバーを備えた漏電遮断器である。
