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Kawamura, Hideyuki; Hirose, Naoki*; Nakayama, Tomoharu*; Ito, Toshimichi
JAEA-Data/Code 2021-004, 34 Pages, 2021/05
JAEA-Data-Code-2021-004.pdf:3.72MB
The Japan Atomic Energy Agency measured the ocean current across the Tsugaru Strait using an Acoustic Doppler Current Profiler attached on a ferryboat from October 1999 to January 2008. The characteristics of the ocean current in the Tsugaru Strait must be understood for predicting oceanic dispersion of radioactive materials released from nuclear facilities around the strait. Furthermore, it is critical to elucidate the mechanism of the Tsugaru Warm Current from an oceanography viewpoint. The dataset obtained in this investigation consists of daily ocean current data files that record the components of the current speed in the east-west and north-south directions from the surface layer to the bottom layer. The dataset stores 2,211 daily ocean current data files, despite some data periods missing from October 1999 to January 2008. In this study, information on the dataset is described for users to analyze the dataset properly for their purposes. Section 1 provides the background and purpose of the ocean current measurement, Section 2 explains the methodology of measurement using an Acoustic Doppler Current Profiler, and Section 3 explains the record format of the daily ocean current data files and data acquisition rate and presents analysis results. Finally, Section 4 concludes this study.
Osawa, Kazuhito*; Goto, Junya*; Yamakami, Masahiro*; Yamaguchi, Masatake; Yagi, Masatoshi*
Physical Review B, 82(18), p.184117_1 - 184117_6, 2010/11
Times Cited Count：116 Percentile：95.05(Materials Science, Multidisciplinary)The configuration of multiple hydrogen atoms trapped in a tungsten monovacancy is investigated using first-principles calculations. Unlike previous computational studies, which have reported that hydrogen in BCC metal monovacancies occupies octahedral interstitial sites, it is found that the stable sites shift towards tetrahedral interstitial sites as the number of hydrogen atoms increases. As a result, a maximum of twelve hydrogen atoms can become trapped in a tungsten monovacancy.
Senju, Tomoharu*; Aramaki, Takafumi; Otosaka, Shigeyoshi; Togawa, Orihiko; Danchenkov, M. A.*; Karasev, E.*; Volkov, Y. N.*
Geophysical Research Letters, 29(7), p.53_1 - 53_4, 2002/04
The newly formed bottom water in the Japan Sea was observed in the summer of 2001 after the severe winter 2000-2001. The new bottom water, which was observed in the northwestern Japan Sea, showed low temperature, high salinity, high dissolved oxygen and low nutrients concentration compared to the old bottom water. The distribution of the bottom water indicates that the deep convection occurred in the area of south off Vladivostok, not the northern Japan Sea, and then the bottom water was advected to the observation area from the convection region. The record of current meters suggests that the deep convection occurred in the early-February, because strong flows faster than 10 cms-1 appeared abruptly from mid-February 2001. This formation event may contribute not only the relaxation of the anoxic trend in the bottom layer but also the spin-up of the thermohaline circulation in the Japan Sea.
Watanabe, Hideo*; Hiragane, Akinori*; Yoshida, Naoaki*; Inoue, Toshihiko; Yamashita, Shinichiro
no journal, ,
no abstracts in English
Watanabe, Hideo*; Yoshida, Naoaki*; Yamashita, Shinichiro; Inoue, Toshihiko
no journal, ,
no abstracts in English
Watanabe, Hideo*; Yoshida, Naoaki*; Yamashita, Shinichiro; Inoue, Toshihiko
no journal, ,
The fuel pin cladding tubes undergoes temperature change by shuffling and burning of fuel pins. The high nickel austenite stainless steel comes under review of alternative materials of high burnup fuel pin cladding tubes. The high nickel steel was irradiated by thermal changing condition to evaluate void formation mechanism. By thermal changing irradiation, the dislocation loop density remains static, and the void number density is rising.
Yagi, Masatoshi; Matsuyama, Akinobu; Takizuka, Tomonori*
no journal, ,
no abstracts in English
