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-gas exposure at high temperaturesTakeda, Yusuke; Iida, Kiyoshi*; Sato, Shinji*; Matsuo, Tadatoshi*; Nagashima, Yasuyuki*; Okubo, Nariaki; Kondo, Keietsu; Hirade, Tetsuya
JPS Conference Proceedings (Internet), 25, p.011023_1 - 011023_3, 2019/03
In this study, we prepared samples under two different conditions, (1) 810
C, for 600 min, and (2) 850C, for 720 min. A depth-profile analysis of the surfaces of the samples is conducted through Doppler broadening (DB) measurements of positron annihilation 
rays using a slow positron beam. It was indicated that many of positrons annihilated in defects near the surface. According to the TEM image, there are nano-crystal grains near the surface and then positrons can diffuse in the grains and annihilate in defects at the grain boundaries. Furthermore, DB measurements indicated that there is a depth dependence on the chemical composition where positrons annihilate. EDS spectroscopy measurements also indicated that there is a depth dependence of impurities such as Vanadium. These results indicated change of the chemical composition at the grain boundaries.
-gas exposure at high temperaturesTakeda, Yusuke; Iida, Kiyoshi*; Sato, Shinji*; Matsuo, Tadatoshi*; Nagashima, Yasuyuki*; Okubo, Nariaki; Kondo, Keietsu; Hirade, Tetsuya
Journal of Physics; Conference Series, 791(1), p.012022_1 - 012022_4, 2017/02
Times Cited Count：1 Percentile：41.91(Physics, Multidisciplinary)Titanium alloy is widely used for applications such as golf club heads and structural materials for aircrafts. The surface can be exceedingly hardened by nitriding treatment that initiates defects, but there are some difficulties on use of titanium nitride because the layer can be exfoliated by stress. Therefore, we prepared samples in two different treatment conditions, (1) 810C 600 min and (2) 850C 720 min and performed depth profile analysis of Doppler broadening of positron annihilation -rays (DB) for these samples. According to a calculation of nitrogen diffusion depth, the nitride layer should be only about 0.05-0.1
m. However, the depth profile analysis of the DB measurement indicated that the defects introduced by nitriding treatment extended to a depth of 0.5m.
Yoshida, Kiyoshi; Takahashi, Yoshikazu; Iida, Hiromasa
IEEE Transactions on Applied Superconductivity, 16(2), p.775 - 778, 2006/06
Times Cited Count：1 Percentile：11.94(Engineering, Electrical & Electronic)The ITER superconducting coil system consists of 18 TF coils, 6 PF coils, 6 CS modules, 18 Correction Coils and their feeders. An extensive measurement and control system is required to monitor and to control these coils and feeders for safety and optimal operational availability. For each coil, both current and helium are supplied from external systems and are controlled from a central control system that manages flow distribution at each cooling pass to smooth the cryoplant loads by a virtual model of the coil thermo-hydraulic system. Quench detection is provided as stand alone system. Monitoring of the electric insulation system inside the coils is performed to detect incipient problems before serious damage. The ITER will procure directly all sensors, wires, electrical insulation breaks and cryogenic components for all the coils and feeders to a common specification. This will avoid duplication of qualification work and guarantee a common interface. This paper introduces the requirements and specifications of the control and instrumentation for the ITER magnet system.
Takeyasu, Masanori; Takeishi, Minoru; Shimizu, Takehiko; Iida, Takao*
Hoken Butsuri, 39(4), p.382 - 390, 2004/00
A computer code system was developed to evaluate a real-time environmental radiation dose when radioactive substances were accidentally released from a nuclear facility. The examination of the system was performed by using the data of air absorbed dose rate observed at monitoring stations and monitoring posts around the Tokai Reprocessing Plant when 
Kr was discharged during its normal operation.
Shimomura, Yasuo; Tsunematsu, Toshihide; Yamamoto, Shin; Maruyama, So; Mizoguchi, Tadanori*; Takahashi, Yoshikazu; Yoshida, Kiyoshi; Kitamura, Kazunori*; Ioki, Kimihiro*; Inoue, Takashi; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 78(Suppl.), 224 Pages, 2002/01
no abstracts in English
Sato, Satoshi; Takatsu, Hideyuki; *; Iida, Hiromasa; Mori, Seiji*; R.Santoro*
Fusion Engineering and Design, 42, p.213 - 219, 1998/00
Times Cited Count：1 Percentile：15.02(Nuclear Science & Technology)no abstracts in English
Yoshida, Kiyoshi; *; R.Gallix*; N.Britousov*; N.Mitchell*; R.J.Thome*
Fusion Engineering and Design, 41, p.247 - 252, 1998/00
Times Cited Count：1 Percentile：15.02(Nuclear Science & Technology)no abstracts in English
Yoshida, Kiyoshi; *; R.Gallix*; S.Sadakov*; R.Vieira*; J.Stoner*; C.Sborchia*
Fusion Technology 1998, 1, p.807 - 810, 1998/00
no abstracts in English
Sato, Satoshi; Takatsu, Hideyuki; *; *; Mori, Seiji*; Iida, Hiromasa; R.Santoro*
Journal of Fusion Energy, 16(3), p.211 - 218, 1997/00
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
*; Yoshida, Kiyoshi; S.Stoner*; A.Tesini*
Proc. of 15th Int. Conf. on Magnet Technology (MT-15), p.433 - 436, 1997/00
no abstracts in English
*; Matsui, Kunihiro; ; *; Kato, Takashi; Tsuji, Hiroshi; *; Yoshida, Kiyoshi; Yasukawa, Yukio*; Hiue, Hisaaki*; et al.
Proc. of 16th Int. Cryogenic Engineering Conf. /Int. Cryogenic Materials Conf., 0, p.135 - 138, 1996/00
no abstracts in English
*;
Sefuthi Nyusu, 0(441), p.2 - 5, 1995/10
no abstracts in English
Kasugai, Yoshimi*; Tanaka, Akihiko*; Asai, Masato*; Yamamoto, Hiroshi*; Kato, Toshio*; *; Takahashi, Akito*; Kawade, Kiyoshi*
JAERI-M 93-124, 41 Pages, 1993/06
no abstracts in English
Kawade, Kiyoshi*; Yamamoto, Hiroshi*; *; Kato, Toshio*; *; Takahashi, Akito*
JAERI-M 92-020, 56 Pages, 1992/03
no abstracts in English
Yanagisawa, Kazuaki; Katanishi, Shoji; *; Sasajima, Hideo; ; Horiki, Oichiro; Mimura, Hideaki; ; ; ; et al.
JAERI-M 92-015, 211 Pages, 1992/02
no abstracts in English
Yanagisawa, Kazuaki; Sasajima, Hideo; Katanishi, Shoji; *; ; Horiki, Oichiro; Mimura, Hideaki; ; ; ; et al.
JAERI-M 91-220, 186 Pages, 1992/01
no abstracts in English
Seki, Yasushi; Takatsu, Hideyuki; Iida, Hiromasa; *; Ogawa, Masuro; Noguchi, Hiroshi; Murata, Mikio; *; *; *; et al.
JAERI-M 91-126, 511 Pages, 1991/08
no abstracts in English
Kawade, Kiyoshi*; Yamamoto, Hiroshi*; *; Kato, Toshio*; *; Takahashi, Akito*
JAERI-M 90-171, 70 Pages, 1990/10
no abstracts in English
Yanagisawa, Kazuaki; ; Sasajima, Hideo; ; ; Ishijima, Kiyomi; ; ; ; ; et al.
JAERI-M 90-091, 171 Pages, 1990/06
no abstracts in English
layers*; ; *; *; Ouchi, Yutaka; Ohara, Yoshihiro; Kunieda, Shunsuke; Kuriyama, Masaaki; Shibanuma, Kiyoshi; Seki, Masahiro; et al.
JAERI-M 90-056, 19 Pages, 1990/03
no abstracts in English
