<<<<<<<<<<<<<< CRC News 2019年 9月 10日 >>>>>>>>>>>>>> CRC会員 各位                   CRC事務局 ***********<宇宙科学談話会スケジュール(9月・10月)>*********** 宇宙科学研究所で開催しております「宇宙科学セミナー・談話会」の9月〜10月 の 予定をお送りいたします。 ※外部からのTV会議接続も歓迎いたします。このメール文末に連絡先を記載し ておりますので、ご希望の方は御一報願います。 また、Zoomによる接続も開始いたしております。zoom にて接続希望の方は、 別途ご案内をいたしますので、前日の15:00までにご連絡いただければ幸いです。 --------------- ○宇宙科学談話会(第168回) 日時: 2019年9月11日(水)16:30〜17:30 場所: 宇宙研新A棟2階会議室A(JAXA相模原キャンパス) 題目: Future Planetary Atmospheric, Surface, and Interior Science Using Radio and Laser Links (電波とレーザーリンクによる将来の惑星大気、地表、内部科学について) 講師: Dr. Sami Asmar (NASA's Jet Propulsion Laboratory, California Institute of Technology: カリフォルニア工科大学、 ナサジェット推進研究所) 概要: Radio links are used to communicate with spacecraft and also to examine important properties of planetary atmospheres, surfaces, and interior structures by carefully studying small changes in the radio signal’s parameters caused by geophysical phenomena. Improving the radio system on the spacecraft and ground stations can lead to additional scientific discoveries. There is a trend to plan for small spacecraft to explore the Solar System in future. Sami Asmar is an experienced radio scientist and leads JPL research initiatives in the science and technology of radio and laser link utilization for planetary exploration. 言語: 英語 --------------- ○宇宙科学談話会(第169回) 日時: 2019年9月25日(水)16:30〜17:30 場所: 宇宙研新A棟2階会議室A(JAXA相模原キャンパス) 題目: Active combustion control in a hybrid rocket engine: performance gain from a case study and practical application needs (能動的燃焼制御のケーススタディ:ハイブリッドロケットエンジンの性能向上 と実用化ニーズ) 講師: Dr. Carmine Carmicino (ISAS/JAXA宇宙飛翔工学研究系) 概要:  Hybrid rocket engines are chemical propulsion systems which, in the most common configuration, employ a liquid oxidizer and a solid fuel. Yet essentially preserving performance comparable to the most complicated liquid rocket engines, their typical arrangement involves a series of benefits that can lead to extensive employment as game changing technology in the current space industry. Because of the separation of propellants, throttling can be easily achieved to meet the thrust profile required by the specific mission by controlling the oxidizer mass flow rate; but, to maintain the operation at the optimum mixture ratio (maximum specific impulse), apart from the main oxidizer flow rate, an additional oxidizer stream must be controlled as, for instance, in the configuration of an A-SOFT hybrid rocket. The latter is analyzed from a performance gain perspective compared to a classical hybrid rocket concept, and the requirements of the fuel regression rate measurement sensors needed for a practical implementation are presented. 言語: 英語 --------------- ○宇宙科学談話会(第170回) 日時: 2019年10月2日(水)16:30〜17:30 場所: 宇宙研A棟1階入札・会議室(JAXA相模原キャンパス) 題目: Deep Learning Models for Autonomous Space Guidance 講師: Dr. Roberto Furfaro (University of Arizona:アリゾナ大学) 概要: TBD 言語: 英語 --------------- ○宇宙科学談話会(第171回) 日時: 2019年10月31日(木)11:00〜12:00 場所: 宇宙研A棟4階会議室(JAXA相模原キャンパス) (通常と曜日及び時間が異なりますので、ご注意ください) 題目: Europa Clipper Mission and Trajectory Design (エウロパ クリッパーのミッション設計および軌道設計) 講師: Dr. Stefano Campagnola (NASA Jet Propulsion Laboratory:ナサジェ ット推進研究所) 概要:  Europa is one of the most scientifically interesting targets of the solar system, as it may possess what are thought to be the three necessary ingredients for life: an extensive ocean of liquid water, an energy source, and a suite of biogenic elements. To explore the habitability of Europa, NASA is developing the Europa Clipper mission, currently scheduled to be launched in 2023. Europa resides deep inside the gravity well of Jupiter, in a region of the magnetosphere with many trapped ionized particles that when accelerated to near relativistic speeds result in a radiation environment detrimental to spacecraft electronics; a Europa orbiter mission that would continuously reside in the same radiation environment as Europa would require a large amount of ΔV for an orbit insertion maneuver, and would only return limited science data before being critically exposed to radiation. To mitigate these issues, Europa Clipper will instead use a high number of Europa flybys, connected by resonant and non-resonant transfers. Science data are collected during high-radiation Europa flybys, and returned to Earth during the rest of the highly elliptical Jovian orbits, at a much lower radiation dose exposure. This talk will present an overview of the Europa Clipper Mission, and discuss some of the tour techniques developed to meet the hundreds of science requirements levied on trajectory design. 言語: 英語 --------------- 【セミナー・談話会一覧】 http://www.isas.jaxa.jp/researchers/colloquium/ 【開催についての連絡先】 宇宙科学談話会・セミナー・世話人一同 danwakai [at] ML.ac.jaxa.jp 【TV会議およびzoom接続の連絡先】 JAXA宇宙科学研究所・科学推進部・東方     東方(内:27130) tobo.kazumi [at] jaxa.jp 注:TV会議の対応規格は、H.323、H.320です。