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Hama, Katsuhiro; Iwasaki, Riyo*; Morikawa, Keita*
JAEA-Technology 2017-015, 45 Pages, 2017/07
JAEA-Technology-2017-015.pdf:16.57MB
Tono Geoscience Center of Japan Atomic Energy Agency has been carrying out the Mizunami Underground Research Laboratory Project. The goal of mass transport study is to obtain a better understanding of mass transport phenomena in the geological environment as well as to develop technologies for measurement of the mass transport parameters, model construction, numerical analysis and validation of those technologies. This experiment was planned to understand the influence of the microscopic structure in the rock mass on the mass transport property. The diffusion experiment using rock sample was carried out. The macroscopic and microscopic observations were carried out to understand the distribution of tracer (uranine) after the diffusion experiment. The uranine was observed in the plagioclase, in the grain boundary and in the microfracture in the mineral grains. These results suggested that distribution of mineral and of microfracture could affect the diffusion property of uranine.
Iwasaki, Riyo*; Hama, Katsuhiro; Morikawa, Keita*; Hosoya, Shinichi*
JAEA-Technology 2016-037, 62 Pages, 2017/02
JAEA-Technology-2016-037.pdf:8.69MB
Mass transport study is mainly performed as part of Phase III in the Mizunami Underground Research Laboratory Project. In Phase III, the goal of mass transport study is to obtain a better understanding of mass transport phenomena in the geological environment as well as to develop technologies for measurement of the mass transport parameters, model construction, numerical analysis and validation of those technologies. This study was planned to understand the influence of the geological characteristics of fracture on the mass transport parameters.
Oshima, Takayuki; Naito, Osamu; Hamamatsu, Kiyotaka; Iba, Katsuyuki; Sato, Minoru; Sakata, Shinya; Tsugita, Tomonori; Matsuda, Toshiaki; Iwasaki, Keita*; Karube, Yukihiro*; et al.
Fusion Engineering and Design, 71(1-4), p.239 - 244, 2004/06
Times Cited Count：5 Percentile：35.25(Nuclear Science & Technology)In the JT-60 tokamak at JAERI, environment for remote participation is planned to be developed by concentrating experts of nuclear fusion research of another research organizations and universities distributed all over the country. We are constructing a hierarchical remote research system, which consists of remote experiment, remote analysis, and remote diagnostic. In a remote collaboration, it is important to maintain the security of the system, as well as to share the information, atmosphere and presence between the participants. For the latter purpose, we developed a video conferencing system, and a video streaming system that can deliver the images of the JT-60 control room. Furthermore, a development of the remote analysis system called "VizAnalysis" has been started. And to assist the remote analysis, we developed a web based software system called "VizSquare". In the JT-60 tokamak at JAERI, security and authentication methods on a computer network and a new communication tool are developed, and probably they will be applied to the remote participation of ITER.
Sato, Minoru; Tsugita, Tomonori; Oshima, Takayuki; Sakata, Shinya; Iwasaki, Keita*; Matsuda, Toshiaki; Iba, Katsuyuki; Ozeki, Takahisa
Fusion Engineering and Design, 71(1-4), p.145 - 149, 2004/06
Times Cited Count：7 Percentile：45.11(Nuclear Science & Technology)Data processing system in JT-60 has been used CAMAC widely for control and data acquisition of plasma diagnostic. However, it has passed over fifteen years from the operation, and the problem is caused for maintenance and function enhancement by the deterioration. Then, Mini-computer and microcomputer ,which control the CAMAC system were replaced workstation based on UNIX-OS, and these system were remodeled by developing the application software for screen control by GUI and for constructing environment of remote diagnostic through the network. In addition, CAMAC device driver for Linux has been developed in for next CAMAC control system.
Oshima, Takayuki; Iwasaki, Keita*; Shimizu, Kazuaki
Heisei-14-Nendo Tokyo Daigaku Sogo Gijutsu Kenkyukai Gijutsu Hokokushu, 3 Pages, 2003/03
no abstracts in English
Iba, Katsuyuki; Oshima, Takayuki; Iwasaki, Keita*
Heisei-14-Nendo Tokyo Daigaku Sogo Gijutsu Kenkyukai Gijutsu Hokokushu, 6 Pages, 2003/03
no abstracts in English
Matsuda, Toshiaki; Totsuka, Toshiyuki; Tsugita, Tomonori; Oshima, Takayuki; Sakata, Shinya; Sato, Minoru; Iwasaki, Keita*
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.512 - 520, 2002/09
Times Cited Count：3 Percentile：23.41(Nuclear Science & Technology)no abstracts in English
Matsuda, Toshiaki; Tsugita, Tomonori; Oshima, Takayuki; Sakata, Shinya; Sato, Minoru; Iwasaki, Keita*
Fusion Engineering and Design, 60(3), p.235 - 239, 2002/06
Times Cited Count：5 Percentile：34.58(Nuclear Science & Technology)no abstracts in English
Oshima, Takayuki; Matsuda, Toshiaki; Iwasaki, Keita*; Ishikawa, Kazuya*
NIFS-MEMO-36, p.463 - 466, 2002/06
no abstracts in English
Iwasaki, Keita*; Sato, Minoru; Matsuda, Toshiaki
NIFS-MEMO-36, p.479 - 482, 2002/06
no abstracts in English
Sato, Minoru; Iwasaki, Keita*; Matsuda, Toshiaki
NIFS-MEMO-36, p.475 - 478, 2002/06
no abstracts in English
Okada, Koichi; Kondo, Keitaro; Sato, Satoshi; Nishitani, Takeo; Nomura, Ken*; Okamoto, Atsushi*; Iwasaki, Tomohiko*; Kitajima, Sumio*; Sasao, Mamiko*
no journal, ,
no abstracts in English
Fukushima, Keitaro*; Iwasaki, Kenta*; Oda, Yoshiya*; Sakai, Masaru*; Katata, Genki*; Yamaguchi, Takashi*; Nakayama, Masataka*; Kubota, Tomohiro*; Nagano, Hirohiko; Watanabe, Makoto*; et al.
no journal, ,
no abstracts in English
Fukushima, Keitaro*; Iwasaki, Kenta*; Oda, Yoshiya*; Sakai, Masaru*; Katata, Genki*; Yamaguchi, Takashi*; Kubota, Tomohiro*; Nagano, Hirohiko; Watanabe, Makoto*; Koarashi, Jun
no journal, ,
Nitrogen retention in the forest ecosystem can be mainly evaluated as a balance between input of atmospheric reactive N and hydrological N loss at a watershed scale. As an assumption for the evaluation, it has been proposed that the watershed is completely "closed", namely, the source of water flowing out from the watershed is rainwater fell into the watershed. This means that exchange of N transported with water between the watershed and the adjacent watershed beyond the watershed boundary is ignored. However, is this assumption applicable for all forested watersheds? If not, nitrogen retention in the watershed may not be evaluated accurately. In our presentation, we aim to elucidate the source of streamwater nitrate-N in the forested watershed whose water balance are not possibly closed.
Fukushima, Keitaro*; Iwasaki, Kenta*; Oda, Yoshiya*; Sakai, Masaru*; Katata, Genki*; Yamaguchi, Takashi*; Kubota, Tomohiro*; Nagano, Hirohiko*; Watanabe, Makoto*; Koarashi, Jun
no journal, ,
no abstracts in English
