翻訳と辞書 Words near each other ・ Dual-mode vehicle ・ Dual-modulus prescaler ・ Dual-phase evolution ・ Dual-phase steel ・ Dual-polarization interferometry ・ Dual-ported RAM ・ Dual-purpose ・ Dual-purpose gun ・ Dual-Purpose Improved Conventional Munition ・ Dual-role transvestism ・ Dual-route hypothesis to reading aloud ・ Dual-sector model ・ Dual-specificity kinase ・ Dual-specificity phosphatase ・ Dual-sport motorcycle ・ Dual-Stage 4-Grid ・ Dual-task paradigm ・ Dual-threat quarterback ・ Dual-thrust ・ Dual-tone multi-frequency signaling ・ Dual-touchscreen ・ Dual-track system ・ Dual-tracked roller coaster ・ Dual-use technology ・ Dual-voltage ・ Dual-voltage CPU ・ Duala ・ Duala language ・ Duala people ・ DUALabs Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Dual-Stage 4-Grid ： ウィキペディア英語版 Dual-Stage 4-Grid The Dual-Stage 4-Grid (DS4G) is an electrostatic ion thruster design currently under development by the European Space Agency, in collaboration with the Australian National University. The design was derived by D. Fern from Controlled Thermonuclear Reactor experiments that use a 4-grid mechanism to accelerate ion beams. A 4-grid ion thruster with only 0.2 m diameter is projected to absorb 250 kW power. With that energy input rate, the thruster could produce a thrust of 2.5 N. The specific impulse (a measure of fuel efficiency), could reach 19,300 s at an exhaust velocity of 210 km/s if xenon propellant were used.〔() THE INNOVATIVE DUAL-STAGE 4-GRID ION THRUSTER CONCEPT – THEORY AND EXPERIMENTAL RESULTS〕 The potentially attainable power and thrust densities would substantially extend the power absorption of current ion thrusters to far more than 100 kW. These characteristics facilitate the development of ion thrusters that can result in extraordinary high-end velocities.〔 Like with thruster concepts such as VASIMR, the dual-stage-4-grid ion thrusters are mainly limited by the necessary power supply for their operation. For example, if solar panels were to supply more than 250 kW, the size of the solar array would surpass the size of the solar panels of the International Space Station. To provide 250 kW with Stirling radioisotope generators would require roughly 1000 kg of plutonium-238 (for which the US stockpile as of 2013 was no more than 20 kg), and so a nuclear thermal reactor would be needed. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dual-Stage 4-Grid」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.