3652 0 0 0 OA On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective
- 著者
- Eizo NAKAMURA Katsura KOBAYASHI Ryoji TANAKA Tak KUNIHIRO Hiroshi KITAGAWA Christian POTISZIL Tsutomu OTA Chie SAKAGUCHI Masahiro YAMANAKA Dilan M. RATNAYAKE Havishk TRIPATHI Rahul KUMAR Maya-Liliana AVRAMESCU Hidehisa TSUCHIDA Yusuke YACHI Hitoshi MIURA Masanao ABE Ryota FUKAI Shizuho FURUYA Kentaro HATAKEDA Tasuku HAYASHI Yuya HITOMI Kazuya KUMAGAI Akiko MIYAZAKI Aiko NAKATO Masahiro NISHIMURA Tatsuaki OKADA Hiromichi SOEJIMA Seiji SUGITA Ayako SUZUKI Tomohiro USUI Toru YADA Daiki YAMAMOTO Kasumi YOGATA Miwa YOSHITAKE Masahiko ARAKAWA Atsushi FUJII Masahiko HAYAKAWA Naoyuki HIRATA Naru HIRATA Rie HONDA Chikatoshi HONDA Satoshi HOSODA Yu-ichi IIJIMA Hitoshi IKEDA Masateru ISHIGURO Yoshiaki ISHIHARA Takahiro IWATA Kosuke KAWAHARA Shota KIKUCHI Kohei KITAZATO Koji MATSUMOTO Moe MATSUOKA Tatsuhiro MICHIKAMI Yuya MIMASU Akira MIURA Tomokatsu MOROTA Satoru NAKAZAWA Noriyuki NAMIKI Hirotomo NODA Rina NOGUCHI Naoko OGAWA Kazunori OGAWA Chisato OKAMOTO Go ONO Masanobu OZAKI Takanao SAIKI Naoya SAKATANI Hirotaka SAWADA Hiroki SENSHU Yuri SHIMAKI Kei SHIRAI Yuto TAKEI Hiroshi TAKEUCHI Satoshi TANAKA Eri TATSUMI Fuyuto TERUI Ryudo TSUKIZAKI Koji WADA Manabu YAMADA Tetsuya YAMADA Yukio YAMAMOTO Hajime YANO Yasuhiro YOKOTA Keisuke YOSHIHARA Makoto YOSHIKAWA Kent YOSHIKAWA Masaki FUJIMOTO Sei-ichiro WATANABE Yuichi TSUDA
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.98, no.6, pp.227-282, 2022-06-10 (Released:2022-06-10)
- 参考文献数
- 245
- 被引用文献数
- 90
Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned from the C-type asteroid Ryugu by the Hayabusa2 mission. On average Ryugu particles consist of 50% phyllosilicate matrix, 41% porosity and 9% minor phases, including organic matter. The abundances of 70 elements from the particles are in close agreement with those of CI chondrites. Bulk Ryugu particles show higher δ18O, Δ17O, and ε54Cr values than CI chondrites. As such, Ryugu sampled the most primitive and least-thermally processed protosolar nebula reservoirs. Such a finding is consistent with multi-scale H-C-N isotopic compositions that are compatible with an origin for Ryugu organic matter within both the protosolar nebula and the interstellar medium. The analytical data obtained here, suggests that complex soluble organic matter formed during aqueous alteration on the Ryugu progenitor planetesimal (several 10’s of km), <2.6 Myr after CAI formation. Subsequently, the Ryugu progenitor planetesimal was fragmented and evolved into the current asteroid Ryugu through sublimation.
- 著者
- Hironori SAHARA Satoshi HOSODA Yoshiki SUGAWARA Masakatsu NAKANO Shinichi NAKASUKA
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN (ISSN:18840485)
- 巻号頁・発行日
- vol.8, no.ists27, pp.Tu_1-Tu_4, 2010 (Released:2011-06-14)
- 参考文献数
- 1
This paper proposes to hold “Ig Satellite Design Contest,” in order to expand our space utilization by means of content-based satellites in the stream of recent microsatellite development. Going back to the history of the recent microsatellite, such a content-based satellite is positioned as the third-generation one. Ig Satellite Design Contest stands on the position of the two policies, that is, the satellite is chip in porridge for practical effect, but is to bring pleasure or happiness to people, or to stimulate access to the space and our future space activities.
- 著者
- Hironori SAHARA Satoshi HOSODA Yoshiki SUGAWARA Masakatsu NAKANO Shinichi NAKASUKA
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN (ISSN:18840485)
- 巻号頁・発行日
- vol.10, no.ists28, pp.Tf_1-Tf_4, 2012 (Released:2012-03-29)
- 参考文献数
- 1
We organize Ig Satellite Design Contest to collect the NEEDS and to establishment of NEEDS database for microsatellite. It will be polestar for the satellite developers. This paper shows an example of NEEDS collection and derivation of the key technologies from the NEEDS, which should offer a strategic direction to the SEEDS, the satellite developers for example.
- 著者
- Tomoki YOMURA Guirong SHI Satoshi HOSODA Shiichiro INOUE
- 出版者
- The Japan Association of Applied Psychology
- 雑誌
- 応用心理学研究 (ISSN:03874605)
- 巻号頁・発行日
- vol.46, no.SpecialEdition, pp.29-37, 2020-07-31 (Released:2020-10-31)
- 参考文献数
- 7
Although there have been some studies on safety culture, studies on specific methods to foster safety culture have been limited. Moreover, it is deemed necessary to assess and foster safety cultures not only for individual organizations but also inter-organizationally. In this study, we developed a program to foster safety culture. Thereafter, we applied the program to multi-tiered industrial organizations. Hence, this paper focuses on interorganizational approaches. The program consisted of multiple questionnaire surveys, interview surveys, group works, and monitoring surveys. The subjects of the surveys were members of energy plants. As a result, in general, improvements in the safety culture evaluation were seen after the implementation of countermeasures. In the program consisting of multiple surveys and activities, a certain effect of fostering safety culture in multi-tiered organizations was recognized. Henceforth, more studies will be required on the means of assessing and fostering safety cultures in multi-tiered industrial organizations of various types.