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排序方式: 共有59条查询结果,搜索用时 15 毫秒
1.
H. Fuke Y. Tasaki K. Abe S. Haino Y. Makida S. Matsuda J.W. Mitchell A.A. Moiseev J. Nishimura M. Nozaki S. Orito J.F. Ormes M. Sasaki E.S. Seo Y. Shikaze R.E. Streitmatter J. Suzuki K. Tanaka T. Yamagami A. Yamamoto T. Yoshida K. Yoshimura 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(12):2050-2055
2.
Noriyuki Namiki Takahiro Iwata Nobuyuki Kawano Fumio Fuke Naoki Tateno Kazuyoshi Asari Hirotomo Noda Yusuke Kono Hideo Hanada Yukihiro Yahagi Zen’ichi Yamamoto Koji Tanaka Mitsuo Yamada Koji Matsumoto Sander Goossens 《Space Science Reviews》2010,154(1-4):103-121
The Japanese lunar mission Selenological and Engineering Explorer (SELENE) was launched in September 2007 and continued its mission until June 2009, when the main orbiter impacted with the surface of the Moon. SELENE consisted of three satellites: Main, Rstar, and Vstar. Rstar’s tasks were to forward up-link signals from the Usuada Deep Space Center (UDSC) to Main, and to down-link returning signals from Main to UDSC. We refer to this tracking sub-system as a four-way Doppler measurement. In contrast, conventional tracking systems between Rstar and UDSC as well as between Main and ground stations are referred to as two-way Doppler and range measurements. Using Main and Rstar, we successfully observed the gravity field over the farside of the Moon. Because four-way Doppler measurements via a relay sub-satellite were a fundamental experiment in space for Japanese space agencies, compatibility of radiometric instruments onboard Main and Rstar to UDSC were carefully examined at the UDSC using components manufactured for flight models. These tests not only proved the feasibility of the four-way Doppler measurements but also provided biases and variations of the four-way Doppler and two-way Doppler and range measurements that were later taken into account during the processing of tracking data and the analysis of the lunar global gravity field. 相似文献
3.
Aya Bamba Hiroya Yamaguchi Katsuji Koyama Junko S. Hiraga Steve Holt John P. Hughes Hideaki Katagiri Jun Kataoka Satoru Katsuda Shunji Kitamoto Motohide Kokubun Hironori Matsumoto Emi Miyata Koji Mori Hiroshi Nakajima Masanobu Ozaki Rob Petre Akiko Sekiguchi Tadayuki Takahashi Takaaki Tanaka Yukikatsu Terada Hiroshi Tomida Yohko Tsuboi Masahiro Tsujimoto Hiroshi Tsunemi Yasunobu Uchiyama Masaru Ueno Shin Watanabe 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(3):411-415
SN 1006 is one of the supernova remnants (SNRs) with relatively low-temperature electrons, considering the young age of just 1000 years. We carried out SN 1006 mapping observations with the X-ray Imaging Spectrometers (XIS) and the Hard X-ray Detector (HXD) onboard Suzaku, the fifth Japanese X-ray satellite. Thanks to the excellent spectral resolution of XIS in the soft X-ray band, H-like and He-like oxygen emission lines were clearly detected, and we could make a map of the line intensity, and as well as a flux and the photon index of nonthermal component. We found that these parameters have spatial dependences from region to region in the SNR; the north region is bright in nonthermal, while dim in thermal; the east region is bright in both nonthermal and thermal; the inner region shows dim nonthermal and bright thermal emission. The photon index is the smallest in the north region. 相似文献
4.
Junichi Yamazaki Seiji Mitsuhashi Masahito Yamauchi Junichi Tachino Rie Honda Motomaro Shirao Kazuo Tanimoto Hiroyuki Tanaka Nobuaki Harajima Asako Omori Satoshi Yahagi Shigehiro Kanayama Yuichi Iijima Hisashi Ohtake 《Space Science Reviews》2010,154(1-4):21-56
The High-Definition television (HDTV) system onboard the Japanese lunar explorer Kaguya (SELENE) consists of a telephotographic camera and a wide-angle camera that each have 2.2 M-pixel IT-CCDs (interline transfer charge-coupled devices) and LSIs (large-scale integrated circuits) of the several-million-gates class. One minute-long motion pictures acquired by the HDTV system at 30 fps (frames per second) are recorded in a 1 GB semiconductor memory after compression, and then transmitted to a ground station. In the development of the space-going HDTV system, a commercial ground-model HDTV system was extensively modified and evaluated for its suitability to withstand the harsh environment of space through environmental tests. The HDTV acquired a total of 6.3 TB of movies and still images of the Earth and the Moon over the mission period that started on September 29, 2007, and ended on June 11, 2009. Footage of an “Earth-rise” and an “Earth-set” on the lunar horizon were captured for the first time by the HDTV system. During a lunar eclipse, images of the Earth’s “diamond ring” were acquired for the first time. The CCDs and the instruments used in the system remained in good working order throughout the mission period, despite the harsh space environment, which suggests a potential new approach to the development of instruments for use in space. 相似文献
5.
Y. Tanaka 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1985,5(3):81-89
Tenma, the second X-ray astronomy satellite of Japan launched in February 1983, is outlined. The main instrument of Tenma is a large-area gas scintillation proportional counter array. Some of the highlights of the results thus far obtained are briefly discussed. 相似文献
6.
T Takakura E Goto M Tanaka 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1996,18(4-5):255-258
An axis clinostat was constructed to create micro and negative gravity also a rotated flat disk was constructed with different rotation rates to give increased gravity, by centrifugal force up to 48 g. Rice seeds were grown on agar in tubes at the constant air temperature of 20 degrees C under an average light condition of 110 micromol/m2/sec(PPF). Humidity was not controlled but was maintained above 90%. Since the tube containers were not large enough for long cultivation, shoot and root growth were observed every 12 hours until the sixth day from seeding. The lengths of shoots and roots for each individual plant were measured on the last day. The stem lengths were increased by microgravity but the root lengths were not. Under the negative gravity, negative orthogeotropism and under microgravity, diageotropism was observed. No significant effect of increased gravity was observed on shoot and root growth. 相似文献
7.
A highly reliable and economical system design is presented for a multiport amplifier (MPA) system, which has attracted considerable attention for its potential use in multibeam mobile satellite communications. An MPA is composed of multiple input/output ports and an array of multiple high-power amplifier (HPAs). Since the HPAs are shared among multiple beams, this design solves the problems of traffic imbalance among beams, traffic changes due to terminal movement, and changes in propagation conditions, and can efficiently utilize the total transmitting power with maximum flexibility and minimum hardware. The problem is that HPA failures degrade the MPA beam isolation, causing multipath interference in the surrounding area due to leakage through adjacent beams. To address this problem, we investigated the MPA performance and survival probability when HPAs fail, by taking the specific properties of the MPA configuration into account. Based on our analysis, we found that there is an optimum operational HPA on/off mode in the event of HPA failure, and we were able to obtain optimal performance and reliability by reconfiguring the HPA on/off states in orbit upon the occurrence of HPA failures. Our proposed self-redundant, reconfigurable MPA can achieve high reliability without any need for additional redundant units or switches. 相似文献
8.
9.
Attitude reorientation maneuvers were conducted three times on the transfer orbit to obtain the apogee kick motor firing attitude of the Medium Capacity Geostationary Communication Satellite for Experimental Purposes (CS) on the third apogee. After two attitude and five orbit maneuvers on the drift orbit, the CS attained geostationary orbit with station keeping accuracy of ±0.1° seven days after launch. 相似文献
10.
A Sato T Hamazaki T Oomura H Osada M Kakeya M Watanabe T Nakamura Y Nakamura N Koshikawa I Yoshizaki S Aizawa S Yoda A Ogiso M Takaoki Y Kohno H Tanaka 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1999,24(6):807-813
The paper summarizes the data on proliferation and gravity-related gene expression of osteoblasts that were obtained from an experiment conducted under simulated and real microgravity conditions. Simulated microgravity conditions obtained in a clinostat depress proliferation of both osteoblast-like MC3T3-E1 and HeLa carcinoma cells. This depression of proliferation occurs in a collagen gel culture in which the flow of culture medium by rotation may be reduced. Interestingly, MC3T3-E1 cells which are probably one of target cells to microgravity are more sensitive than the HeLa cells. Simulated microgravity inhibited the epidermal growth factor (EGF)-induced c-fos gene expression in the MC3T3-El cells. To examine in detail the effect of real microgravity on the EGF signal transduction cascade in osteoblasts, MC3T3-E1 cells were cultured in the Cell Culture Experiment Module of the sounding rocket TR-1A6. The EGF-induced c-fos expression in cells was depressed under short-term microgravity conditions in the sounding rocket, while the phosphorylation of mitogen-activated protein kinase (MAPK) was not affected compared with the controls grown on the ground. These results suggest that an action site of microgravity in the signal transduction pathway may be downstream of MAPK. 相似文献