Ceek.jp Altmetrics (α ver.)
  1. ホーム
  2. 文献一覧: Seiichi SAKAMOTO (著者)
  3. 2件

4 0 0 0 OA From Nobeyama Radio Observatory to the international project ALMA —Evolution of millimeter and submillimeter wave astronomy in Japan—

著者
Masato ISHIGURO Kurazo CHIBA Seiichi SAKAMOTO
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.8, pp.439-469, 2022-10-11 (Released:2022-10-11)
参考文献数
100
The establishment of the Nobeyama Radio Observatory (NRO) in 1982 was an important event that greatly influenced the subsequent development of Japanese astronomy. The 45 m radio telescope and the Nobeyama Millimeter Array (NMA) pushed Japanese radio astronomy to the forefront of the world. As a plan beyond the Nobeyama telescopes, the Japanese radio astronomy community considered a large array to achieve unprecedented resolution at millimeter and submillimeter wavelengths under the project name of the Large Millimeter and Submillimeter Array (LMSA). After long and patient discussions and negotiations with the United States and Europe, the LMSA plan eventually led to the ALMA (Atacama Large Millimeter/submillimeter Array) as an international joint project, and the ALMA was inaugurated in 2013. This paper reviews the process from the establishment of the NRO to the realization of the ALMA, including planning of the LMSA, international negotiations, site survey, instrumental developments, and initial science results.

1 0 0 0 OA Development of a Candy Hybrid Rocket Motor for Undergraduate Space Education

著者
Yutaka WADA Yo KAWABATA Kenji OGIMOTO Hiroaki AKIYAMA Takao YANAGI Seiichi SAKAMOTO
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.16, no.6, pp.506-510, 2018 (Released:2018-09-04)
参考文献数
11
In this study, a reusable educational motor that can burn different types of materials in the chamber was developed. Specifically, five candidate sweets were selected as fuel and burnt. The combustion performances of these sweets were compared, and the soft candy was selected as the solid fuel to be used in the motor, because it had the highest total impulse. The SOUKI Systems Co. Ltd. designed a small candy hybrid rocket based on these results. The candy rocket was launched successfully using soft candy at the Kada Cosmo Park. The motor carried the candy rocket to 319 m altitude and was fully functional under the high-acceleration environment.