Search

Your search keyword '"Kotoku, Junichi"' showing total 18 results
Start Over Author "Kotoku, Junichi"
18 results on '"Kotoku, Junichi"'

4. Present status of X-ray telescope onboard HINODE and contamination control on the orbit

Author

Kano, Ryouhei, Bando, Takamasa, Kotoku, Junichi, Sakao, Taro, and Narukage, Noriyuki

Abstract

第9回宇宙科学シンポジウム(2009年1月6日-7日, 宇宙航空研究開発機構宇宙科学研究本部), 「ひので」X線望遠鏡は2年以上に渡り観測を行っている。その観測運用と軌道上温度環境についてまず総括する。現在、観測継続が不可能になる重大不具合はないものの、CCDの有機物汚染(コンタミネーション)が明らかとなっている。これについて、軌道上でのコンタミ管理という観点を含めて報告する。, 形態: カラー図版あり, 資料番号: AA0064293121

Published
2009

5. Response of the Solar Atmosphere to Magnetic Flux Emergence from Hinode Observations

Author

Li, Hui, Sakurai, Takashi, Shine, Richard A., Tarbell, Theodore D., Title, Alan M., Lites, Bruce, Shibasaki, Kiyoto, Saar, Steven H., Bobra, Monica, Ichimoto, Kiyoshi, Suematsu, Yoshinori, Tsuneta, Saku, Katsukawa, Yukio, Shimizu, Toshifumi, Kubo, Masahito, Nagata, Shinichi, and Kotoku, Junichi

Subjects
Physics, Photosphere, Space and Planetary Science, Astronomy, Flux, Astronomy and Astrophysics, Satellite, Astrophysics, Chromosphere, Coronal radiative losses, Magnetic flux, Nanoflares, Line (formation)
Abstract

著者人数：17名, Accepted: 2007-09-18, 資料番号: SA1000283000

Published
2007

6. Current status of development of small satellite Cute, a student-run university program

Author

Kuramoto, Yusuke, Kotoku, Junichi, Yatsu, Yoichi, Kataoka, Jun, Ikagawa, Tomoko, Kawai, Nobuyuki, Saito, Takao, Arimoto, Makoto, Shima, Tatsushi, and Kishimoto, Shunji

Subjects
シングルイベントアップセット, microsatellite, 暗電流, avalanche diode, Earth orbital environment, dark current, proton beam, 衛星搭載装置, 携帯端末, シングルイベントラッチアップ, satellite-borne instrument, 小型衛星, 地球軌道環境, アバランシェダイオード, personal digital assistance, radiation dosage, single event upset, single event latch-up, 陽子線, 照射線量, CUTE
Abstract

資料番号: AA0049122095

Published
2005

7. Current status of development of small satellite Cute-1.7, a student-run university program

Author

Kotoku, Junichi, Kuramoto, Yusuke, Kataoka, Jun, Kawai, Nobuyuki, Yatsu, Yoichi, Ikagawa, Tomoko, Saito, Takao, and Arimoto, Makoto

Subjects
microsatellite, 燕, 耐放射線性, avalanche diode, measuring instrument, radiation tolerance, 携帯端末, satellite design, satellite core, 小型衛星, charged particle, 測定装置, 荷電粒子, アバランシェダイオード, university, personal digital assistance, 衛星設計, spaceborne experiment, 大学, 衛星核, CUTE, Tsubame, 宇宙実験
Abstract

資料番号: AA0049122094

Published
2005

8. Latest results of gamma ray burst exploration satellite (HETE-2)

Author

Tamagawa, Toru, Kawai, Nobuyuki, Suzuki, Motoko, Urata, Yuji, Sato, Rie, Kotani, Taro, Kotoku, Junichi, Arimoto, Makoto, Yoshida, Atsumasa, and Nakagawa, Yujin

Subjects
ガンマ線バースト, astronomical satellite, international cooperation, 超新星爆発, 超新星, 光度, 天文衛星, X線, 位置通報, gamma ray burst, X-ray, position report, 国際協力, supernova explosion, gamma ray, supernova, ガンマ線, neutron star, 中性子星, luminous intensity
Abstract

HETE-2(ヘティー2)は、理研を中心とした日本グループが米仏と共同で開発、打ち上げ運用を行ってきた、世界初のガンマ線バースト(GRB)探査専用衛星です。2000年10月の打ち上げ以来、GRBの正体を爆発エネルギーの大きなIc型超新星であると特定することに貢献するなど、大きな成果を挙げてきました。HETE-2の最大の特徴である、GRBの即時精密位置通報機能と、地上の望遠鏡の連携は、これまでの衛星では、なし得なかった、GRB発生直後の残光現象の振る舞いを明らかにし、その研究手法の有効性を示しました。今後は、2004年11月に打ち上げられた、次世代ガンマ線バースト探査衛星Swiftと相補的な観測を継続していく予定です。, 資料番号: AA0049122174

Published
2005

9. Improvements of the Astro-E2 Hard X-ray Detector (HXD-II)

Author

Madejski, G. M., Niko, H., Okada, Y., Tominaga, S., Kokubun, Motohide, Abe, Keiichi, Ezoe, Yuichiro, Fukazawa, Yasushi, Hong, Soojing, Inoue, Hokuto, Itoh, Takeshi, Kamae, Tsuneyoshi, Kasama, Daisuke, Kawaharada, Madoka, Kawano, Naomi, Kawashima, K., Kawasoe, Satoshi, Kobayashi, Yoshihito, Kotoku, Junichi, Kouda, Manabu, Kubota, Aya, Makishima, Kazuo, Mitani, Takefumi, Miyasaka, Hiromasa, Miyawaki, Ryohei, Mori, Kunishiro, Mori, Masanori, Murakami, Toshio, Murashima, Mio M., Nakazawa, Kazuhiro, Nomachi, Masaharu, Ohno, Masanori, Oonuki, Kosuke, Sato, Goro, Suzuki, Masaya, Takahashi, Hiromitsu, Takahashi, Isao, Takahashi, Tadayuki, Tamura, Kenichi, Tanaka, Takaaki, Tashiro, Makoto, Terada, Yukikatsu, Watanabe, Shin, Yamaoka, Kazutaka, Yanagida, Takayuki, and Yonetoku, Daisuke

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Nuclear Energy and Engineering, Proton, Nuclear electronics, Detector, Resolution (electron density), X-ray detector, Irradiation, Electrical and Electronic Engineering, Sensitivity (electronics)
Abstract

著者人数: 46名, 資料番号: SA1003790000

Published
2004

10. Transcatheter Arterial Embolization for Primary Postpartum Hemorrhage: Predictive Factors of Need for Embolic Material Conversion of Gelatin Sponge Particles to N-Butyl Cyanoacrylate

Author

Tanahashi, Yukichi, primary, Goshima, Satoshi, additional, Kondo, Hiroshi, additional, Ando, Tomohiro, additional, Noda, Yoshifumi, additional, Kawada, Hiroshi, additional, Kawai, Nobuyuki, additional, Kotoku, Junichi, additional, Furui, Shigeru, additional, and Matsuo, Masayuki, additional

Published
2016
Full Text
View/download PDF

11. γ線バースト観測衛星HETE-2の現状

Author

Suzuki, Motoko, Tamagawa, Toru, Kawai, Nobuyuki, Kotoku, Junichi, Sato, Rie, Arimoto, Makoto, Shimokawabe, Takashi, Yoshida, Atsumasa, Nakagawa, Yujin, Tanaka, Kaoru, 鈴木 素子, 玉川 徹, 河合 誠之, 古徳 純一, 佐藤 理江, 有元 誠, 下川辺 隆史, 吉田 篤正, 中川 友進, 田中 薫, Suzuki, Motoko, Tamagawa, Toru, Kawai, Nobuyuki, Kotoku, Junichi, Sato, Rie, Arimoto, Makoto, Shimokawabe, Takashi, Yoshida, Atsumasa, Nakagawa, Yujin, Tanaka, Kaoru, 鈴木 素子, 玉川 徹, 河合 誠之, 古徳 純一, 佐藤 理江, 有元 誠, 下川辺 隆史, 吉田 篤正, 中川 友進, and 田中 薫

Abstract

高エネルギートランジェント天体探査衛星2号機(HETE-2: High Energy Transient Explorer-2)は世界初のガンマ線バースト探査専用衛星で、2000年10月の打ち上げから5年を経過した現在も順調に運用・観測を続けている。2005年7月9日にHETE-2は継続時間の短い'ショートバースト'をとらえた。HETE-2からの速報をうけた大口径の望遠鏡などにより可視光では初めてショートバーストの残光を観測。ショートバーストの起源はこれまでによく調査されてきた継続時間の長いガンマ線バーストとは異なることが分かってきた。今後もHETE-2は運用を続け、swift衛星と連携しながらガンマ線バーストの調査を続ける。

Published
2015

12. 大学小型衛星Cute-1.7の開発現状

Author

Kotoku, Junichi, Kuramoto, Yusuke, Kataoka, Jun, Kawai, Nobuyuki, Yatsu, Yoichi, Ikagawa, Tomoko, Saito, Takao, Arimoto, Makoto, 古徳 純一, 倉本 祐輔, 片岡 淳, 河合 誠之, 谷津 陽一, 五十川 知子, 齊藤 孝男, 有元 誠, Kotoku, Junichi, Kuramoto, Yusuke, Kataoka, Jun, Kawai, Nobuyuki, Yatsu, Yoichi, Ikagawa, Tomoko, Saito, Takao, Arimoto, Makoto, 古徳 純一, 倉本 祐輔, 片岡 淳, 河合 誠之, 谷津 陽一, 五十川 知子, 齊藤 孝男, and 有元 誠

Published
2015

13. Present status of HETE-2, the gamma-ray burst observation satellite

Author

Suzuki, Motoko, Tamagawa, Toru, Kawai, Nobuyuki, Kotoku, Junichi, Sato, Rie, Arimoto, Makoto, Shimokawabe, Takashi, Yoshida, Atsumasa, Nakagawa, Yujin, and Tanaka, Kaoru

Subjects
Internet, ガンマ線バースト, 地上支援システム, 宇宙探査, astronomical satellite, ショートバースト, 小型科学衛星, ground support system, 天文衛星, star formation, gamma ray burst, small scientific satellite, 残光, 星生成, light curve, short burst, HETE-2, 光度曲線, インターネット, afterglow, space exploration
Abstract

高エネルギートランジェント天体探査衛星2号機(HETE-2: High Energy Transient Explorer-2)は世界初のガンマ線バースト探査専用衛星で、2000年10月の打ち上げから5年を経過した現在も順調に運用・観測を続けている。2005年7月9日にHETE-2は継続時間の短い'ショートバースト'をとらえた。HETE-2からの速報をうけた大口径の望遠鏡などにより可視光では初めてショートバーストの残光を観測。ショートバーストの起源はこれまでによく調査されてきた継続時間の長いガンマ線バーストとは異なることが分かってきた。今後もHETE-2は運用を続け、swift衛星と連携しながらガンマ線バーストの調査を続ける。, 資料番号: AA0063353058

Published
2006

14. Development of avalanche photodiodes for scintillation detectors onboard the NeXT satellite

Author

Ikagawa, Tomoko, Kataoka, Jun, Saito, Takao, Kuramoto, Yusuke, Yatsu, Yoichi, Kotoku, Junichi, Kawai, Nobuyuki, and Ishikawa, Yoshitaka

Subjects
automatic gain control, avalanche diode, junction capacitance, astronomical satellite, 接合容量, シンチレーションカウンター, ガンマ線スペクトロメータ, energy resolution, 衛星搭載装置, NeXT, satellite-borne instrument, 天文衛星, スペクトル分解能, アバランシェダイオード, 温度依存, 自動利得制御, エネルギー分解能, spectral resolution, gamma ray spectrometer, temperature dependence, scintillation counter
Abstract

資料番号: AA0049122013

Published
2005

15. Suzaku Reveals Helium-burning Products in the X-ray Emitting Planetary Nebula BD+303639

Author

Arnaud, K., Murashima, Mio, Kokubun, Motohide, Makishima, Kazuo, Kotoku, Junichi, Murakami, Hiroshi, Matsushita, Kyoko, Hayashida, Kiyoshi, Hamaguchi, Kenji, and Matsumoto, Hironori

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), X-ray, Imaging spectrometer, FOS: Physical sciences, chemistry.chemical_element, Astronomy and Astrophysics, Astrophysics, Planetary nebula, chemistry, Space and Planetary Science, Observatory, Astrophysics::Solar and Stellar Astrophysics, Helium, Astrophysics::Galaxy Astrophysics
Abstract

BD+303639, the brightest planetary nebula at X-ray energies, was observed with Suzaku, an X-ray observatory launched on 2005 July 10. Using the X-ray Imaging Spectrometer, the K-lines from C VI, O VII, and O VIII were resolved for the first time, and C/O, N/O, and Ne/O abundance ratios determined. The C/O and Ne/O abundance ratios exceed the solar value by a factor of at least 30 and 5, respectively. These results indicate that the X-rays are emitted mainly by helium shell-burning products., 12 pages, 4 figures, accepted for publication in The Astrophysical Journal Letters

Published
2006

16. HETE-2 Localization and Observations of the Gamma-Ray Burst GRB 020813

Author

Sato, Rie, primary, Sakamoto, Takanori, additional, Kataoka, Jun, additional, Yoshida, Atsumasa, additional, Suzuki, Motoko, additional, Kotoku, Junichi, additional, Urata, Yuji, additional, Yamamoto, Yoshihisa, additional, Arimoto, Makoto, additional, Tamagawa, Toru, additional, Shirasaki, Yuji, additional, Torii, Ken’ichi, additional, Matsuoka, Masaru, additional, Nakagawa, Yujin, additional, Yamazaki, Toru, additional, Tanaka, Kaoru, additional, Maetou, Miki, additional, Yamauchi, Makoto, additional, Takagishi, Kunio, additional, Lamb, Donald Q., additional, Atteia, Jean-Luc, additional, Vanderspek, Roland, additional, Graziani, Carlo, additional, Prigozhin, Gregory, additional, Villasenor, Joel, additional, Jernigan, J. Garrett, additional, Crew, Geoffrey B., additional, Hurley, Kevin, additional, Ricker, George R., additional, Woosley, Stanford E., additional, Butler, Nat, additional, Levine, Al, additional, Doty, John P., additional, Donaghy, Timothy Q., additional, Fenimore, Edward E., additional, Galassi, Mark, additional, Boer, Michel, additional, Dezalay, Jean-Pascal, additional, Olive, Jean-François, additional, Braga, Joao, additional, Manchanda, Ravi, additional, Pizzichini, Graziella, additional, and Kawai, Nobuyuki, additional

Published
2005
Full Text
View/download PDF

18. Soft and Hard X-Ray Emissions from the Anomalous X-Ray Pulsar 4U 0142+61 Observed with Suzaku

Author

Enoto, Teruaki, Makishima, Kazuo, Nakazawa, Kazuhiro, Kokubun, Motohide, Kawaharada, Madoka, Kotoku, Junichi, and Shibazaki, Noriaki

Abstract

The anomalous X-ray pulsar 4U 0142$+$61 was observed with Suzaku on 2007 August 15 for a net exposure of $\sim\ $100 ks, and was detected in a 0.4 to $\sim\ $70 keV energy band. The intrinsic pulse period was determined to be 8.68878$\ \pm\ $0.00005 s, in agreement with an extrapolation from previous measurements. The broadband Suzaku spectra enabled a first simultaneous and accurate measurement of the soft and hard components of this object by a single satellite. The former can be reproduced by two blackbodies, or slightly better by a resonant cyclotron scattering model. The hard component can be approximated by a power-law of photon index of $\Gamma_{\rm h}$ $\sim\ $ 0.9 when the soft component is represented by the resonant cyclotron scattering model, and its high-energy cutoff is constrained as $\gt\ $180 keV. Assuming an isotropic emission at a distance of 3.6 kpc, the unabsorbed 1–10 keV and 10–70 keV luminosities of the soft and hard components were calculated to be 2.8 $\times$ 10$^{35}\ $erg s$^{-1}$ and 6.8 $\times$ 10$^{34}\ $erg s$^{-1}$, respectively. Their sum becomes $\sim\ $10$^3$ times as large as the estimated spin-down luminosity. On a time scale of 30 ks, the hard component exhibited evidence of variations either in its normalization or pulse shape.

Published
2011
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results