Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.
Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03
Times Cited Count：43 Percentile：96.93(Astronomy & Astrophysics)Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 
C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.
Sanada, Yukihisa; Nishizawa, Yukiyasu; Yamada, Tsutomu; Ikeda, Kazutaka*; Matsui, Masashi*; Tsuchida, Kiyofumi; Sato, Yoshiharu; Hirayama, Hirokatsu; Takamura, Yoshihide; Nishihara, Katsuya; et al.
JAEA-Research 2013-049, 129 Pages, 2014/03
JAEA-Research-2013-049.pdf:15.5MB
By the nuclear disaster of Fukushima Daiichi Nuclear Power Plant (NPP), Tokyo Electric Power Company (TEPCO), caused by the East Japan earthquake and the following tsunami occurred on March 11, 2011, a large amount of radioactive materials was released from the NPP. In recent years, technologies for autonomous unmanned helicopters (AUHs) have been developed and applied to natural disasters. In expectation of the application of the AUHs to aerial radiation monitoring, we had developed a remote radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas and to investigate the decontamination effect by the measurements before and after decontamination treatment. Here, we reports on the measurement technique and the result.
Faenov, A. Y.; Inogamov, N. A.*; Zhakhovskii, V. V.*; Khokhlov, V. A.*; Nishihara, Katsunobu*; Kato, Yoshiaki*; Tanaka, Momoko; Pikuz, T. A.*; Kishimoto, Maki; Ishino, Masahiko; et al.
Applied Physics Letters, 94(23), p.231107_1 - 231107_3, 2009/06
Times Cited Count：44 Percentile：82.04(Physics, Applied)C operation of the HTTRSakaba, Nariaki; Matsuzawa, Takaharu*; Hirayama, Yoshiaki*; Nakagawa, Shigeaki; Nishihara, Tetsuo; Takeda, Tetsuaki
Proceedings of 2005 International Congress on Advances in Nuclear Power Plants (ICAPP '05) (CD-ROM), 8 Pages, 2005/05
The permeation of hydrogen isotopes through the Hastelloy XR high-temperature alloy adopted for the heat exchanger pipes of the intermediate heat exchanger in the HTTR (High Temperature Engineering Test Reactor) is one of the concerns in the hydrogen production system, which will be connected to the HTTR in the near future. An evaluation of the hydrogen permeation between the primary and secondary coolant through the Hastelloy XR was performed using the hydrogen concentration data observed during the initial 950C operation of the HTTR. The hydrogen permeability of the Hastelloy XR was estimated conservatively high as follows. The activation energy E
and pre-exponential factor F of the permeability of hydrogen were E = 62 kJ/mol and F = 3.6
10
cm
(NTP)/(cm s Pa
), respectively, in the temperature range from 735K to 940K. The results implied that some oxidized film had been formed on the surface of the heat exchanger pipes of the intermediate heat exchanger.
Tang, H.; Daido, Hiroyuki; Kishimoto, Maki; Sukegawa, Kota*; Tai, R.; Mesesson, S.*; Tanaka, Momoko; Lu, P.; Kawachi, Tetsuya; Nagashima, Keisuke; et al.
Japanese Journal of Applied Physics, 42(2A), p.443 - 448, 2003/02
Times Cited Count：14 Percentile：50.38(Physics, Applied)no abstracts in English
Miyamoto, Yoshiaki; Ogawa, Masuro; Akino, Norio; Shiina, Yasuaki; Inagaki, Yoshiyuki; Shimizu, Saburo; Onuki, Kaoru; Ishiyama, Shintaro; Katanishi, Shoji; Takeda, Tetsuaki; et al.
JAERI-Review 2001-006, 147 Pages, 2001/03
JAERI-Review-2001-006.pdf:9.2MB
no abstracts in English
Miyamoto, Yoshiaki; Shiozawa, Shusaku; Ogawa, Masuro; Inagaki, Yoshiyuki; Katanishi, Shoji; Nishihara, Tetsuo; Shimizu, Saburo
Hydrogen Energy Progress 13 (Proceedings of the 13th World Hydrogen Energy Conference), p.297 - 302, 2000/06
no abstracts in English
Shiozawa, Shusaku; Ogawa, Masuro; Inagaki, Yoshiyuki; Katanishi, Shoji; Takeda, Tetsuaki; Nishihara, Tetsuo; Shimizu, Saburo; Ohashi, Hirofumi; Miyamoto, Yoshiaki
Proceedings of 12th Pacific Basin Nuclear Conference (PBNC 2000) (CD-ROM), 10 Pages, 2000/01
no abstracts in English
Miyamoto, Yoshiaki; Shiozawa, Shusaku; Ogawa, Masuro; Inagaki, Yoshiyuki; Nishihara, Tetsuo; Shimizu, Saburo
Proceedings of International Hydrogen Energy Forum 2000, 2, p.271 - 278, 2000/00
no abstracts in English
Hayashi, Kimio; Ishihara, Masahiro; Shibata, Taiju; Ishino, Shiori*; Terai, Takayuki*; Ito, Hisayoshi; Tagawa, Seiichi*; Katsumura, Yosuke*; Yamawaki, Michio*; Shikama, Tatsuo*; et al.
Proceedings of 1st Information Exchange Meeting on Basic Studies on High-Temperature Engineering, p.41 - 58,268, 1999/09
no abstracts in English
Miyamoto, Yoshiaki; Shiozawa, Shusaku; Ogawa, Masuro; Akino, Norio; Shimizu, Saburo; Hada, Kazuhiko; Inagaki, Yoshiyuki; Onuki, Kaoru; Takeda, Tetsuaki; Nishihara, Tetsuo
IAEA-TECDOC-1056, p.191 - 200, 1998/11
no abstracts in English
Miyamoto, Yoshiaki; Shiozawa, Shusaku; Akino, Norio; Ogawa, Masuro; Hada, Kazuhiko; Shiina, Yasuaki; Shimizu, Saburo; Inagaki, Yoshiyuki; Onuki, Kaoru; Fumizawa, Motoo; et al.
Proc. of 9th Annual U. S.Hydrogen Meeting, p.367 - 369, 1998/00
no abstracts in English
Faenov, A. Y.; Inogamov, N. A.*; Zhakhovskii, V.*; Khokhlov, V. A.*; Nishihara, Katsunobu*; Kato, Yoshiaki*; Tanaka, Momoko; Pikuz, T.*; Kishimoto, Maki; Ishino, Masahiko; et al.
no journal, ,
Odakura, Makoto; Ichige, Yoshiaki; Kuroha, Mitsuhiko; Yamagishi, Isao; Ishihara, Miho; Fukui, Toshiki*; Yoshioka, Masahiro*
no journal, ,
no abstracts in English
Kai, Tetsuya; Furuta, Etsuko*; Ishihara, Sachiko*; Hasemi, Hiroyuki*; Shinohara, Takenao; Harada, Masahide; Oikawa, Kenichi; Oi, Motoki; Segawa, Mariko; Iikura, Hiroshi; et al.
no journal, ,
The authors report status of the J-PARC neutron imaging beam-line and a result of cadmium distribution imaging in oil paints by utilizing the neutron transmission ratio of cadmium exhibits local minimum at 0.2 eV as an example of neutron resonance imaging technique. The measurement was carried out by using oil paints labeled cadmium yellow, vanadium yellow, cadmium orange, cadmium red and two kinds of cadmium green. Each oil paint was put on a 1515 mm aluminum plate, and then was dried. Contrasts were recognized for all oil paint in a conventional neutron radiograph of the samples, while no contrasts were found in the neutron transmission image of 0.2 eV at the positions of vanadium yellow and one of cadmium green. It was found that a distribution of cadmium in oil paints was well demonstrated by the neutron resonance imaging.
