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Kato, Tetsu*; Kawamura, Yamato*; Tahara, Junichiro*; Baba, Shoichiro*; Sanada, Yukihisa; Fujii, Shun*
International Journal of Offshore and Polar Engineering, 31(3), p.316 - 324, 2021/09
Times Cited Count：2 Percentile：19.84(Engineering, Civil)The development of a side thruster system (vehicle (ASV)) that can maintain the direction of travel on the autonomous surface will be explained. Currently, we are working on a mud radioactivity survey in collaboration with Japan Agency for Marine-Earth Science and Technology, Japan Atomic Energy Agency, and Tokyo University of Marine Science and Technology. Deposited at the mouth of Fukushima Prefecture, Japan, the main purpose is to collect unmanned mud using ASV. The Mad Collection has developed a side thruster system and implemented it in ASV. We have confirmed the operation of the ASV with the joystick by using the thruster system for operating the ASV by one person using the joystick.
Asahi, Yuichi; Fujii, Keisuke*
Purazuma, Kaku Yugo Gakkai-Shi, 97(2), p.86 - 92, 2021/02
The 5D gyrokinetic simulation data has been analyzed with the data-driven analysis methods. By defining an entropy-like quantity with singular values, we have quantitatively evaluated the randomness of the plasma state. We found that the randomness of plasma increases after the avalanche like transport and then gradually decrease. Since the decrease of the randomness is expected to be relevant to the phase space structure formation, we have developed a method to extract the phase space structures from the time series of 5D data. The relationship between the avalanche-like transport and phase space structures is discussed based on the contribution of each principal component to the energy transport.
Asahi, Yuichi; Fujii, Keisuke*; Heim, D. M.*; Maeyama, Shinya*; Garbet, X.*; Grandgirard, V.*; Sarazin, Y.*; Dif-Pradalier, G.*; Idomura, Yasuhiro; Yagi, Masatoshi*
Physics of Plasmas, 28(1), p.012304_1 - 012304_21, 2021/01
Times Cited Count：4 Percentile：41.65(Physics, Fluids & Plasmas)This article demonstrates a data compression technique for the time series of five dimensional distribution function data based on Principal Component Analysis (PCA). Phase space bases and corresponding coefficients are constructed by PCA in order to reduce the data size and the dimensionality. It is shown that about 83% of the variance of the original five dimensional distribution can be expressed with 64 components. This leads to the compression of the degrees of freedom from 
to 
. One of the important findings - resulting from the detailed analysis of the contribution of each principal component to the energy flux - deals with avalanche events, which are found to be mostly driven by coherent structures in the phase space, indicating the key role of resonant particles.
Kato, Tetsu*; Kawamura, Yamato*; Tahara, Junichiro*; Baba, Shoichiro*; Sanada, Yukihisa
Proceedings of the 30th (2020) International Ocean and Polar Engineering Conference (ISOPE 2020) (USB Flash Drive), p.1255 - 1260, 2020/10
Hiramatsu, Yoichi*; Shimada, Taihei*; Miyahara, Yoshikazu*
JAERI-Tech 99-082, p.274 - 0, 1999/12
no abstracts in English
Tachibana, Yukio; E.Krempl*
J. Eng. Mater. Technol., 120(3), p.193 - 196, 1998/07
Times Cited Count：16 Percentile：62.26(Engineering, Mechanical)no abstracts in English
Takeda, Seiji; Moltyaner, G. L.*
JAERI-Research 98-031, 28 Pages, 1998/06
JAERI-Research-98-031.pdf:1.29MB
no abstracts in English
Physics Letters A, 230(1-2), p.117 - 120, 1997/06
Times Cited Count：1 Percentile：19.24(Physics, Multidisciplinary)no abstracts in English
Physics Letters A, 171, p.134 - 136, 1992/11
Times Cited Count：9 Percentile：59.54(Physics, Multidisciplinary)no abstracts in English
G.Taucher-Scholz*; M.Schneider*; J.Heilmann*; Kobayashi, Yasuhiko; J.Stanton*; G.Kraft*
GSI-92-1, 0, 284 Pages, 1992/03
no abstracts in English
Physica A, 185, p.336 - 339, 1992/00
Times Cited Count：0 Percentile：0.01(Physics, Multidisciplinary)no abstracts in English
Physical Review B, 44(22), p.12586 - 12588, 1991/12
Times Cited Count：0 Percentile：0.32(Materials Science, Multidisciplinary)no abstracts in English
Journal of Physics; Condensed Matter, 3, p.7039 - 7046, 1991/00
Times Cited Count：4 Percentile：33.14(Physics, Condensed Matter)no abstracts in English
Al wiresD.Zeritis*
JAERI-M 90-014, 56 Pages, 1990/02
no abstracts in English
*; *; ; Kuriyama, Isamu
J.Mater.Sci., 13(1), p.77 - 83, 1978/01
Times Cited Count：1no abstracts in English
;
Annals of Nuclear Energy, 4(9-10), p.465 - 470, 1977/10
Times Cited Count：13no abstracts in English
Shimada, Taro
no journal, ,
We investigated the practices of treatment and disposal of asbestos wastes, which is one of the specially controlled industrial wastes. Based on the results, we constructed the exposure scenario after clearance of asbestos wastes. We calculated the concentrations corresponding to 10 
Sv/y to the public for 33 radionuclides and the values were rounded to logarithm. As a result, the rounded concetrations for 33 radionuclides were equal to or less than the current clearance level for metal and concrete.
Yoshimura, Koki*; Fujii, Shun*; Morito, Makoto*; Sato, Tasuku*; Tahara, Junichiro*; Baba, Shoichiro*; Sanada, Yukihisa
no journal, ,
no abstracts in English
Yokota, Hiromi*; Fujimoto, Katsushige*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Otaka, Masahiko
no journal, ,
no abstracts in English
