全文获取类型
收费全文 | 1056篇 |
免费 | 17篇 |
国内免费 | 3篇 |
专业分类
航空 | 477篇 |
航天技术 | 467篇 |
综合类 | 15篇 |
航天 | 117篇 |
出版年
2022年 | 5篇 |
2021年 | 12篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 4篇 |
2016年 | 10篇 |
2015年 | 5篇 |
2014年 | 22篇 |
2013年 | 21篇 |
2012年 | 31篇 |
2011年 | 43篇 |
2010年 | 28篇 |
2009年 | 49篇 |
2008年 | 95篇 |
2007年 | 26篇 |
2006年 | 28篇 |
2005年 | 45篇 |
2004年 | 36篇 |
2003年 | 30篇 |
2002年 | 25篇 |
2001年 | 50篇 |
2000年 | 19篇 |
1999年 | 35篇 |
1998年 | 36篇 |
1997年 | 13篇 |
1996年 | 32篇 |
1995年 | 20篇 |
1994年 | 33篇 |
1993年 | 21篇 |
1992年 | 29篇 |
1991年 | 10篇 |
1990年 | 14篇 |
1989年 | 31篇 |
1988年 | 13篇 |
1987年 | 6篇 |
1986年 | 12篇 |
1985年 | 19篇 |
1984年 | 27篇 |
1983年 | 22篇 |
1982年 | 20篇 |
1981年 | 24篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1978年 | 6篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1974年 | 3篇 |
1970年 | 3篇 |
1969年 | 4篇 |
排序方式: 共有1076条查询结果,搜索用时 390 毫秒
651.
652.
V. Abrashkin V. Alexandrov Y. Arakcheev J. Cotzomi A. Diaz M. Finger G. Garipov V. Grebenyuk N. Kalmykov B. Khrenov S.H. Kim P. Klimov V. Koval O. Martinez S.W. Nam D. Naumov A. Olshevsky M. Panasyuk I.H. Park J.H. Park E. Ponce A. Puchkov C. Robledo A. Rosado I. Rubinshtein S. Sharakin A. Silaev L. Tkatchev V. Tulupov B. Sabirov H. Salazar O. Saprykin L. Villasenor I. Yashin N. Zaikin 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(12):2079-2088
The TUS (Tracking Ultra-violet Set up) space fluorescence detector has to be launched in 2010 as a separated platform in Foton (Bion) mission prepared by the Samara enterprise. This detector was designed for another satellite and the updated variant of the TUS detector for a new platform is presented. The data on UV glow of the atmosphere obtained in operation of one pixel of the TUS detector on board the Moscow State University “Universitetsky-Tatiana” satellite was taken into account in design of the updated TUS detector. The data on UV transient flashes registered in “Universitetsky-Tatiana” mission are of special interest. Electronics of the TUS detector able to select and register different types of UV events in the atmosphere is presented. 相似文献
653.
Kalman filtering for matrix estimation 总被引:1,自引:0,他引:1
Choukroun D. Weiss H. Bar-Itzhack I.Y. Oshman Y. 《IEEE transactions on aerospace and electronic systems》2006,42(1):147-159
A general discrete-time Kalman filter (KF) for state matrix estimation using matrix measurements is presented. The new algorithm evaluates the state matrix estimate and the estimation error covariance matrix in terms of the original system matrices. The proposed algorithm naturally fits systems which are most conveniently described by matrix process and measurement equations. Its formulation uses a compact notation for aiding both intuition and mathematical manipulation. It is a straightforward extension of the classical KF, and includes as special cases other matrix filters that were developed in the past. Beyond the analytical value of the matrix filter, it is shown through various examples arising in engineering problems that this filter can be computationally more efficient than its vectorized version. 相似文献
654.
J. S. Kaastra A. M. Bykov S. Schindler J. A. M. Bleeker S. Borgani A. Diaferio K. Dolag F. Durret J. Nevalainen T. Ohashi F. B. S. Paerels V. Petrosian Y. Rephaeli P. Richter J. Schaye N. Werner 《Space Science Reviews》2008,134(1-4):1-6
We present the work of an international team at the International Space Science Institute (ISSI) in Bern that worked together
to review the current observational and theoretical status of the non-virialised X-ray emission components in clusters of
galaxies. The subject is important for the study of large-scale hierarchical structure formation and to shed light on the
“missing baryon” problem. The topics of the team work include thermal emission and absorption from the warm-hot intergalactic
medium, non-thermal X-ray emission in clusters of galaxies, physical processes and chemical enrichment of this medium and
clusters of galaxies, and the relationship between all these processes. One of the main goals of the team is to write and
discuss a series of review papers on this subject. These reviews are intended as introductory text and reference for scientists
wishing to work actively in this field. The team consists of sixteen experts in observations, theory and numerical simulations. 相似文献
655.
A particular alignment mechanization for a nonmaneuvering vehicle is described which uses a monitor gyro to estimate the slave inertial navigation system (INS) equivalent east gyro drift rate and thus improves azimuth alignment. A state-space model of the dynamic system with measurements is developed. Results of covariance simulations employing Kalman filter estimation are presented for two master INS position update scenarios, one involving frequent and very accurate updates and the other including infrequent and coarse updates. The ef fects of position updates and the monitor gyro on the quality of transfer alignment are demonstrated and analyzed. 相似文献
656.
This paper treats the problem of finding an orthogonal matrix which is the closest, in the Forbenius norm, to a given nonorthogonal matrix. This nonorthogonal matrix is the result of a fast but rather inaccurate computation of the well-known direction cosine matrix (DCM) of a strapdown inertial navigation system. The known closed-form solution to this problem is rederived using the directional derivative method, and the conditions for minimum distance are derived and discussed. A new iterative technique for solving this problem is derived as a result of the application of the gradient projection technique and the directional derivative method. The practical computational problems involved in this technique are discussed. The new technique is demonstrated by three examples. Although particular attention is given to the 3 X 3 direction cosine matrix, the conclusions are nonetheless valid higher order matries. 相似文献
657.
658.
A.M. Si Mohammed M. Benyettou Y. Bentoutou A. Boudjemai Y. Hashida M.N. Sweeting 《Acta Astronautica》2009,64(7-8):796-809
In this paper, the control system of the first Algerian microsatellite in orbit Alsat-1 is presented. Alsat-1 is a 3-axis stabilised microsatellite, using a pitch momentum wheel and yaw reaction wheel, with dual redundant 3-axis magnetorquers. A gravity gradient boom is employed to provide a high degree of platform stability. Two vector magnetometers and four dual sun sensors are carried in order to determine the attitude. This paper examines the low Earth orbit (LEO) control system requirements and design in the context of a real system, the Surrey Satellite Technology Limited (SSTL) advanced microsatellite platform and puts forward designs for the control system to match the advanced capability of the enhanced microsatellite platform. Numerical results show the effectiveness of the implementation. Comparison with in orbit results is presented to evaluate the performance of the control system during accurate Nadir pointing control. 相似文献
659.
There is understanding to date that Pi2 pulsations have two sources. One source is a high-latitude one and is due to fluctuations of electrojet parameters. The other source is a mid-latitude one and is driven by a global mode excited in the Earths plasmasphere. There is experimental evidence that in the near-equatorial regions the character of Pi2 excitation is different from high and mid-latitudes. In this connection, we investigated the amplitude-spectral-polarization characteristics of Pi2 pulsations using the date from near-equatorial Chinese stations. The detected regularities in the excitation of near-equatorial Pi2 pulsations are used in the discussion of the possible physical mechanism that is responsible for the generation of these pulsations. 相似文献
660.
Robot-aided remote inspection experiment on STS-85 总被引:1,自引:0,他引:1
Kimura S. Okyuama T. Yoshioka N. Wakabayashi Y. 《IEEE transactions on aerospace and electronic systems》2000,36(4):1290-1297
The results are presented for the robot-aided spacecraft inspection experiments using a flaw detection algorithm called multi-images overcast (MIO), which were conducted as an extension of NASDA's Manipulator Flight Demonstration mission installed on space shuttle mission STS-85. These experiments are the first step towards research and development of the Orbital Maintenance System to support space systems by inspecting satellites, deorbiting useless satellites, and repairing satellites in orbit to utilize space systems effectively and reliably. 相似文献