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Motion reconstruction of the small carry-on impactor aboard Hayabusa2

Astrodynamics 2020年第4期4卷 289-308页

作者： Takanao Saiki Yuya Mimasu Yuto Takei Manabu Yamada Hirotaka Sawada K azunori Ogawa Naoko Ogawa Hiroshi Takeuchi Akira Miura Yuri Shimaki Koji Wada Rie Honda Yasuhiro Yokota Kei Shirai Naruhisa Sano Hirohito Ohtsuka Go Ono Kent Yoshikawa Shota Kikuchi Chikako Hirose Yukio Yamamoto Takahiro Iwata Masahiko Arakawa Seiji Sugita Satoshi Tanaka Fuyuto Terui Makoto Yoshikawa satoru nakazawa Sei-ichiro Watanabe Yuichi Tsuda Japan Aerospace Exploration Agency Sagamihara 252-5210Japan Chiba Institute of Technology Narashino 275-0016Japan Kobe University K obe 657-8501Japan The Graduate University for Aduanced Studies Sagamihara 252-5210Japan Kochi University Kochi 780-8520Japan IHI Aerospace Co. LtdTomioka 370-2398Japan The University of Tokyo Tokyo 113-0033Japan Nagoya University Nagoya 464-8601Japan

Subsurface exploration is one of the most ambitious scientific objectives of the Hayabusa2 mission.A small device called small carry-on impactor(SCI)was developed to create an artificial crater on the surface of asteroid *** enables us to sample subsurface materials,which will provide a window to the *** physical properties of the resulting crater are also useful for understanding the internal structure of *** understanding of the crater and ejecta properties,including the depth of excavation of subsurface materials,requires accurate information on impact *** particular,the impact angle is a critical factor because it greatly influences the size and shape of the *** April 5,2019,the Hayabusa2 spacecraft deployed the SCI at 500 m of altitude above the asteroid *** SCI gradually reduced its altitude,and it shot a 2 kg copper projectile into the asteroid 40 min after *** the position of the released SCI is essential for determining the impact *** study describes the motion reconstruction of the SCI based on the actual operation *** results indicate that the SCI was released with high accuracy.

关键词： small body exploration Hayabusa2 kinetic impact artificial crater motion reconstruction

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Hayabusa2’s station-keeping operation in the proximity of the asteroid Ryugu

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Astrodynamics 2020年第4期4卷 349-375页

作者： Yuto Takei Takanao Saiki Yukio Yamamoto Yuya Mimasu Hiroshi Takeuchi Hitoshi Ikeda Naoko Ogawa Fuyuto Terui Go Ono Kent Yoshikawa Tadateru Takahashi Hirotaka Sawada Chikako Hirose Shota Kikuchi Atsushi Fuji Takahiro Iwata satoru nakazawa Masahiko Hayakawa Ryudo Tsukizaki Satoshi Tanaka Masanori Matsushita Osamu Mori Daiki Koda Takanobu Shimada Masanobu Ozaki Masanao Abe Satoshi Hosoda Tatsuaki Okada Hajime Yano Takaaki Kato Seiji Yasuda Kota Matsushima Tetsuya Masuda Makoto Yoshikawa Yuichi Tsuda Japan Aerospace Exploration Agency Sagarmihara 252-5210Japan The Graduate University for Advanced Studies Sagarmihara 252-5210Japan NEC Aerospace Systems LtdFruchu 183-8502Japan NEC Corporation Puchu 183-8501Japan

The Japanese interplanetary probe Hayabusa2 was launched on December 3,2014 and the probe arrived at the vicinity of asteroid 162173 Ryugu on June 27,*** its 1.4 years of asteroid proximity phase,the probe successfully accomplished numbers of record-breaking achievements including two touchdowns and one artificial cratering experiment,which are highly expected to have secured surface and subsurface samples from the asteroid inside its sample container for the first time in *** Hayabusa2 spacecraft was designed not to orbit but to hover above the asteroid along the sub Earth *** orbital and geometrical configuration allows the spacecraft to utilize its high-gain antennas for telecommunication with the ground station on Earth while pointing its scientific observation and navigation sensors at the *** paper focuses on the regular station-keeping operation of Hayabusa2,which is called“home position”(HP)-keeping ***,together with the spacecraft design,an operation scheme called HP navigation(HPNAV),which includes a daily trajectory control and scientific observations as regular activities,is *** the description on the guidance,navigation,and control design as well as the framework of optical and radiometric navigation,the results of the HP-keeping operation including trajectory estimation and delta-V planning during the entire asteroid proximity phase are summarized and evaluated as a first ***,this paper states that the *** operation in the framework of HPNAV had succeeded without critical incidents,and the number of trajectory control delta-V was planned fficiently throughout the period.

关键词： small body mission station-keeping guidance,navigation,and control(GNC) optical and radiometric navigation

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诱导一氧化氮合酶对大鼠自体免疫心肌炎血液动力学的影响

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湖北民族学院学报（医学版） 1997年第1期14卷 48-48页

作者： satoru M Omedul Islam Mikio nakazawa 薛蕙

由诱导一氧化氮合酶(ivos)产生的过多的一氧化氮(NO)已被认为与心血管系统的多种免疫相关性疾病有关,但NO是否与心肌炎的发生有关尚无定论。因此对实验性自身免疫性心肌炎(EAM,即一种人巨细胞性心肌炎的动物模型)进程中INOS表达的意义... 详细信息

由诱导一氧化氮合酶(ivos)产生的过多的一氧化氮(NO)已被认为与心血管系统的多种免疫相关性疾病有关,但NO是否与心肌炎的发生有关尚无定论。因此对实验性自身免疫性心肌炎(EAM,即一种人巨细胞性心肌炎的动物模型)进程中INOS表达的意义进行了研究。用心脏有肌浆蛋月对路易士大鼠进行免疫,分别在接受免疫后的第7、14、21、28和49天时处死,再分别对免疫14、21、28天的大鼠,通过心脏插管术观察,由于血液动力学的明显恶化使心肌炎病变加重,21天时心肌炎的严重组织学变化和心功能恶化同时达到高峰;通过cL_氮基甲酸乌氨酸的形成对心脏INOS活性进行测定,在第14、21、28天时显著增加;INOS的表达被免疫斑点实验进一步证实,而且通过免疫组织化学分析发现INOS表达局限于坏死心肌细胞附近炎性细胞浸润区。氨基胍,一种选择性INOS抑制剂,可使INOS活性显著下降(用其治疗患病鼠,治疗组与未治疗组和病鼠组比较,前者为1.04±0.37pmol/***^(-1)蛋白质,后者为29.1±8.62pmol/***^(-1)蛋白质,(p<0.01),而且在第21天时EAM的组织病理方面的变化也明显减少,血液动力学参数也有改善;平均动脉压从8.51±0.40kPa升高到11.84±0.40kPa,左心室收缩压从10.6±0.27kPa升高到15.03±0.53kPa,而右心室舒张压则从1.04±0.

关键词：自体免疫一氧化氮合酶血液动力学 INOS 实验性自身免疫性心肌炎大鼠氨基胍升高到变化率乌氨酸

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