全文获取类型
收费全文 | 4055篇 |
免费 | 32篇 |
国内免费 | 17篇 |
专业分类
航空 | 1608篇 |
航天技术 | 1428篇 |
综合类 | 17篇 |
航天 | 1051篇 |
出版年
2022年 | 15篇 |
2021年 | 41篇 |
2019年 | 30篇 |
2018年 | 131篇 |
2017年 | 103篇 |
2016年 | 85篇 |
2015年 | 35篇 |
2014年 | 125篇 |
2013年 | 140篇 |
2012年 | 117篇 |
2011年 | 202篇 |
2010年 | 159篇 |
2009年 | 239篇 |
2008年 | 250篇 |
2007年 | 132篇 |
2006年 | 96篇 |
2005年 | 120篇 |
2004年 | 126篇 |
2003年 | 143篇 |
2002年 | 96篇 |
2001年 | 145篇 |
2000年 | 67篇 |
1999年 | 72篇 |
1998年 | 84篇 |
1997年 | 77篇 |
1996年 | 76篇 |
1995年 | 92篇 |
1994年 | 65篇 |
1993年 | 52篇 |
1992年 | 74篇 |
1991年 | 21篇 |
1990年 | 25篇 |
1989年 | 66篇 |
1988年 | 30篇 |
1987年 | 34篇 |
1986年 | 32篇 |
1985年 | 114篇 |
1984年 | 81篇 |
1983年 | 60篇 |
1982年 | 66篇 |
1981年 | 105篇 |
1980年 | 47篇 |
1979年 | 21篇 |
1978年 | 22篇 |
1977年 | 21篇 |
1976年 | 24篇 |
1975年 | 26篇 |
1974年 | 26篇 |
1973年 | 15篇 |
1970年 | 10篇 |
排序方式: 共有4104条查询结果,搜索用时 31 毫秒
181.
N. D. Akhmetov M. M. Gimadeev V. N. Drulis V. A. Krivosheev T. V. Rzaeva 《Russian Aeronautics (Iz VUZ)》2011,54(1):108-113
A technique for calculating the energy parameters of shock waves at electrical discharge in water is presented for the transition
region of discharge channel expansion using as the base the predetermined characteristics of discharge circuit. The technique
is based on the solution of energy transport equation that is similar in form to that of radiative transfer. The validity
of the presented approach was experimentally verified. 相似文献
182.
Systems for the indication and display of secondary information in avionics and autobasing complexes
A. A. Bagdasarov R. V. Anitropov O. V. Bagdasarova I. L. Livshits 《Russian Aeronautics (Iz VUZ)》2011,54(2):185-191
We consider the peculiarities of application for the cabin indicating systems of secondary information display, formulate
and systematize the compositional and technical requirements for display systems and their elements. The tendencies and lines
in the development of head-up displays for avionics and autobasing complexes were determined. The technique of calculating
optics of such display systems with the use of electronic distortion compensation is presented. 相似文献
183.
J. Mazur L. Friesen A. Lin D. Mabry N. Katz Y. Dotan J. George J. B. Blake M. Looper M. Redding T. P. O’Brien J. Cha A. Birkitt P. Carranza M. Lalic F. Fuentes R. Galvan M. McNab 《Space Science Reviews》2013,179(1-4):221-261
The Relativistic Proton Spectrometer (RPS) on the Radiation Belt Storm Probes spacecraft is a particle spectrometer designed to measure the flux, angular distribution, and energy spectrum of protons from ~60 MeV to ~2000 MeV. RPS will investigate decades-old questions about the inner Van Allen belt proton environment: a nearby region of space that is relatively unexplored because of the hazards of spacecraft operation there and the difficulties in obtaining accurate proton measurements in an intense penetrating background. RPS is designed to provide the accuracy needed to answer questions about the sources and losses of the inner belt protons and to obtain the measurements required for the next-generation models of trapped protons in the magnetosphere. In addition to detailed information for individual protons, RPS features count rates at a 1-second timescale, internal radiation dosimetry, and information about electrostatic discharge events on the RBSP spacecraft that together will provide new information about space environmental hazards in the Earth’s magnetosphere. 相似文献
184.
Concept of monitoring for thermostressed state and service life of aircraft gas turbine engine blades 总被引:1,自引:0,他引:1
G. G. Kulikov V. A. Trushin A. I. Abdulnagimov A. A. Ganeev 《Russian Aeronautics (Iz VUZ)》2016,59(1):77-83
A concept of monitoring for material properties with residual life estimation of rotor blades for gas turbine engines is proposed. The structure of on-board control and conditionmonitoring system based on the intelligent pyrometer module with the algorithm for calculating the residual life of turbine rotor blades is described. 相似文献
185.
R.?A.?KayumovEmail author I.?Z.?Mukhamedova E.?B.?Tuisina 《Russian Aeronautics (Iz VUZ)》2016,59(4):452-459
This paper considers a beam with a technological longitudinal section on the level of the gravity center of the cross section that is loaded by a vertical concentrated force. We study the structure durability depending on the load amplitude and the initial crack length. 相似文献
186.
A.?E.?Remizov V.?V.?Vyatkov V.?A.?LebedevEmail author 《Russian Aeronautics (Iz VUZ)》2016,59(4):559-564
Methods to control flow have been considered in order to reduce end losses in blade rows of GTE gas turbines by means of measures taken at the design stage. 相似文献
187.
188.
The Electric Antennas for the STEREO/WAVES Experiment 总被引:1,自引:0,他引:1
S. D. Bale R. Ullrich K. Goetz N. Alster B. Cecconi M. Dekkali N. R. Lingner W. Macher R. E. Manning J. McCauley S. J. Monson T. H. Oswald M. Pulupa 《Space Science Reviews》2008,136(1-4):529-547
The STEREO/WAVES experiment is designed to measure the electric component of radio emission from interplanetary radio bursts and in situ plasma waves and fluctuations in the solar wind. Interplanetary radio bursts are generated from electron beams at interplanetary shocks and solar flares and are observed from near the Sun to 1 AU, corresponding to frequencies of approximately 16 MHz to 10 kHz. In situ plasma waves occur in a range of wavelengths larger than the Debye length in the solar wind plasma λ D ≈10 m and appear Doppler-shifted into the frequency regime down to a fraction of a Hertz. These phenomena are measured by STEREO/WAVES with a set of three orthogonal electric monopole antennas. This paper describes the electrical and mechanical design of the antenna system and discusses efforts to model the antenna pattern and response and methods for in-flight calibration. 相似文献
189.
190.
D. T. Young J. L. Burch R. G. Gomez A. De Los Santos G. P. Miller P. Wilson N. Paschalidis S. A. Fuselier K. Pickens E. Hertzberg C. J. Pollock J. Scherrer P. B. Wood E. T. Donald D. Aaron J. Furman D. George R. S. Gurnee R. S. Hourani A. Jacques T. Johnson T. Orr K. S. Pan S. Persyn S. Pope J. Roberts M. R. Stokes K. J. Trattner J. M. Webster 《Space Science Reviews》2016,199(1-4):407-470