共查询到20条相似文献,搜索用时 343 毫秒
1.
H.P. Roeser F. Hetfleisch F.M. Huber M.F. von Schoenermark M. Stepper A. Moritz A.S. Nikoghosyan 《Acta Astronautica》2008,63(11-12):1372-1375
It is suggested that oxygen excess in undoped material of the high temperature superconducting bismuth family creates periodic two-dimensional Cu3+-ion patches in the copper–oxygen planes. These nanostructures have a size of square and show a strong linear relationship to their critical transition temperatures Tc. 相似文献
2.
Chandrayaan-1 is the first Indian planetary exploration mission that will perform remote sensing observation of the Moon to further our understanding about its origin and evolution. Hyper-spectral studies in the 0.4– region using three different imaging spectrometers, coupled with a low energy X-ray spectrometer, a sub-keV atom analyzer, a 3D terrain mapping camera and a laser ranging instrument will provide data on mineralogical and chemical composition and topography of the lunar surface at high spatial resolution. A low energy gamma ray spectrometer and a miniature imaging radar will investigate volatile transport on lunar surface and possible presence of water ice in the polar region. A radiation dose monitor will provide an estimation of energetic particle flux en route to the Moon as well as in lunar orbit. An impact probe carrying a mass spectrometer will also be a part of the spacecraft. The 1 ton class spacecraft will be launched by using a variant of flight proven indigenous Polar Satellite Launch Vehicle (PSLV-XL). The spacecraft will be finally placed in a 100 km circular polar orbit around the Moon with a planned mission life of two years. 相似文献
3.
In-orbit deployment characteristics of large deployable antenna reflector onboard Engineering Test Satellite VIII 总被引:6,自引:0,他引:6
This paper describes design, ground testing, an in-orbit experiment, and a novel in-orbit operation for large deployable antenna reflectors (LDRs). Two LDRs (TX-LDR for transmitting and RX-LDR for receiving) are installed on Engineering Test Satellite VIII (ETS-VIII). The reflector design features that the antenna reflector whose aperture is 13 m in diameter (the mechanical dimension is ) consists of 14 basic modules, and each basic module consists of a gold-plated molybdenum mesh, a system of cables, and a deployable frame structures. Several ground tests had been performed using a modular nature to advantage. Prior to the launch of ETS-VIII, we performed an in-orbit deployment experiment using LDREX-2 which consists of seven half-scale modules of LDR, to confirm evaluation accuracy. The LDREX-2 was launched by ARIANE 5 launch vehicle as a piggy-back payload. Deployment characteristics were measured to evaluate the accuracy of analytical prediction obtained by ground deployment testing. ETS-VIII was launched by H-IIA launch vehicle on 18 December 2006. After the successful injection into Geo Synchronous Orbit, the RX-LDR and the TX-LDR were successfully deployed on December 25th and 26th, respectively. We confirmed adequacy of the proposed design and ground verification methodology. 相似文献
4.
5.
6.
Pekka Janhunen 《Acta Astronautica》2011,68(5-6):567-570
7.
8.
10.
11.
12.
13.
《Acta Astronautica》2003,52(2-6):421-425
14.
《Acta Astronautica》2007,60(12):1123-1134
15.
16.
Martin Hechler 《Acta Astronautica》2009,64(2-3):139-151
17.
18.
《Acta Astronautica》2007,60(4-7):472-478
19.