Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Murase, Kiyoka*; Kataoka, Ryuho*; Nishiyama, Takanori*; Nishimura, Koji*; Hashimoto, Taishi*; Tanaka, Yoshimasa*; Kadokura, Akira*; Tomikawa, Yoshihiro*; Tsutsumi, Masaki*; Ogawa, Yasunobu*; et al.
Journal of Space Weather and Space Climate (Internet), 12, p.18_1 - 18_16, 2022/06
Times Cited Count：1 Percentile：22.72(Astronomy & Astrophysics)We identified two energetic electron precipitation (EEP) events during the growth phase of moderate substorms and estimated the mesospheric ionization rate for an EEP event for which the most comprehensive dataset from ground-based and space-born instruments was available. The mesospheric ionization signature reached below 70 km altitude and continued for ~15 min until the substorm onset, as observed by the PANSY radar and imaging riometer at Syowa Station in the Antarctic region. We also used energetic electron flux observed by the Arase and POES 15 satellites as the input for the air-shower simulation code PHITS to quantitatively estimate the mesospheric ionization rate. Combining the cutting-edge observations and simulations, we shed new light on the space weather impact of the EEP events during geomagnetically quiet times, which is important to understand the possible link between the space environment and climate.
Tsuji, Tomoyuki; Sugitsue, Noritake; Sato, Fuminori; Matsushima, Ryotatsu; Kataoka, Shoji; Okada, Shota; Sasaki, Toshiki; Inoue, Junya
Nihon Genshiryoku Gakkai-Shi ATOMO
, 62(11), p.658 - 663, 2020/11
no abstracts in English
Mori, Masahiro; Shoji, Teruaki; Araki, Masanori; Saito, Keiji*; Senda, Ikuo; Omori, Junji*; Sato, Shinichi*; Inoue, Takashi; Ono, Isamu*; Kataoka, Takahiro*; et al.
Nihon Genshiryoku Gakkai-Shi, 44(1), p.16 - 89, 2002/01
no abstracts in English
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
Kataoka, Shoji; Takano, Masato; Sato, Fuminori; Saito, Yasuo
no journal, ,
no abstracts in English
Sato, Fuminori; Kataoka, Shoji; Matsushima, Ryotatsu; Terunuma, Tomomi
no journal, ,
no abstracts in English
Kataoka, Shoji; Matsushima, Ryotatsu; Sato, Fuminori; Terunuma, Tomomi
no journal, ,
The Low-Level Radioactive Waste Treatment Technology Development Facility (LWTF) of Tokai Reprocessing Facility has been constructed as a facility for processing low radioactive liquid waste and solid waste generated from the reprocessing facility, and cold tests are being conducted. In this facility, the nitrate waste liquid generated by the treatment of liquid waste was decided to be solidified using borate, but now it is planned to replace it with carbonate waste liquid and then make it cement solid. Therefore, we are proceeding with examination and design for the introduction of equipment. In this report, we conduct a cement kneading and solidification test on a carbonate waste liquid on a real scale (200L drum), and report on the results of examining the influence of the cement solidified body over time and the strength when the waste liquid composition changes.
Kataoka, Shoji; Takano, Masato; Nagayama, Mineo; Kano, Yoshiharu*; Suzuki, Tatsuya*; Miyabe, Shinsuke*; Sakuma, Takashi*; Shirozu, Hidetomo
no journal, ,
no abstracts in English
Sato, Fuminori; Kataoka, Shoji; Matsushima, Ryotatsu; Otake, Katsumi*; Shirozu, Hidetomo
no journal, ,
no abstracts in English
Sato, Fuminori; Kataoka, Shoji; Matsushima, Ryotatsu; Otake, Katsumi*; Shirozu, Hidetomo
no journal, ,
no abstracts in English
Sato, Fuminori; Kataoka, Shoji; Suzuki, Tatsuya*; Miyabe, Shinsuke*; Sakuma, Takashi*; Shirozu, Hidetomo
no journal, ,
Cs and Sr adsorbents used in LWTF is studied. In this report results of the Cs and Sr adsorption tests were analyzed and examined for application to LWTF.
Kataoka, Shoji; Tsunoda, Hiroki; Matsushima, Ryotatsu; Sato, Fuminori; Shirozu, Hidetomo
no journal, ,
Low Active Waste Treatment Development Facility (LWTF) in Tokai Reprocessing Plant (TRP) is a facility for treatment of low-radioactive liquid and solid wastes generated from the TRP. The liquid wastes treated in LWTF are concentrated low-radioactive liquid waste and phosphoric acid solution, and they are planned to be solidified with cement in our new equipment. The concentrated liquid wastes are separated into slurry and carbonate compounds by a nuclide separation equipment currently in LWTF and a nitrate decomposition equipment which is under development, and then the cement solidification will be carried out on each liquid waste. Currently, studying and designing for the introduction of the nitrate decomposition equipment and cement solidification equipment is in progress. In this paper, results of the cementation demonstration on simulated waste liquids of the carbonate, phosphoric acid and slurry are reported.
Tsunoda, Hiroki; Kataoka, Shoji; Takano, Masato; Sato, Fuminori
no journal, ,
The Low Active Waste Treatment Development Facility (LWTF) at the Tokai Reprocessing Plant (TRP) is a facility to treat low radioactive liquid and solid wastes generated from the reprocessing plant. The liquid wastes to be treated at the LWTF are low radioactive concentrated liquid waste and phosphate liquid waste, which are planned to be cemented solidified. The low radioactive concentrated liquid waste will be separated into slurry liquid waste and carbonate liquid waste by the existing nuclide separation facility and the newly constructed nitrate root decomposition facility, and then cement solidified. Currently, studies and designs are underway for the introduction of a nitrate root decomposition facility and a cement solidification facility. This report describes the results of full-scale kneading tests for cement solidification, which confirmed that the carbonate, slurry, and phosphate wastes hardened by the next day, did not generate floating water, and had sufficient compressive strength.
