全文获取类型
收费全文 | 439篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
航空 | 181篇 |
航天技术 | 89篇 |
综合类 | 4篇 |
航天 | 169篇 |
出版年
2021年 | 3篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 5篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 18篇 |
2012年 | 8篇 |
2011年 | 43篇 |
2010年 | 16篇 |
2009年 | 32篇 |
2008年 | 23篇 |
2007年 | 21篇 |
2006年 | 22篇 |
2005年 | 11篇 |
2004年 | 7篇 |
2003年 | 18篇 |
2002年 | 9篇 |
2001年 | 6篇 |
2000年 | 15篇 |
1999年 | 13篇 |
1998年 | 10篇 |
1997年 | 8篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1991年 | 4篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 14篇 |
1985年 | 16篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 4篇 |
1970年 | 2篇 |
1968年 | 9篇 |
1967年 | 9篇 |
1966年 | 3篇 |
1965年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有443条查询结果,搜索用时 21 毫秒
1.
As the European Union takes tentative steps towards creating a “rapid reaction force” able to operate independently of NATO, an important question is what capabilities that force must have in order to operate effectively. Among those capabilities is the use of space systems for communications and intelligence applications. This article examines the prospects for an independent security space capability in Europe, and the implications of the emerging European interest in space autonomy for US policy. 相似文献
2.
John Pike 《Space Policy》1994,10(3)
Human interest in spaceflight is ancient. It is therefore ironic that, at a time when humans finally have the capability to travel in space, the notion that we should do so is being questioned. The author analyses the reasons for this — the historical/political and technological contingency of the Space Age and the sudden falling away of the conditions which drove space activity — and in the process provides a critique of the forgoing article and the tendency to search for utilitarian justifications of human spaceflight. He argues rather that space programmes will thrive only when driven by non-material cultural and political forces. US-Russian cooperation, which has principally been undertaken for geopolitical reasons is a model for the future. 相似文献
3.
Numerical models of Cepheids have been computed with a range of effective temperatures and compositions. The amplitudes increase if the helium abundance increases or if the effective temperature decreases. The latter effect is contrary to observational data. The models also exhibit velocity amplitudes which are much lower than those observed. 相似文献
4.
Leslie A. Young S. Alan Stern Harold A. Weaver Fran Bagenal Richard P. Binzel Bonnie Buratti Andrew F. Cheng Dale Cruikshank G. Randall Gladstone William M. Grundy David P. Hinson Mihaly Horanyi Donald E. Jennings Ivan R. Linscott David J. McComas William B. McKinnon Ralph McNutt Jeffery M. Moore Scott Murchie Catherine B. Olkin Carolyn C. Porco Harold Reitsema Dennis C. Reuter John R. Spencer David C. Slater Darrell Strobel Michael E. Summers G. Leonard Tyler 《Space Science Reviews》2008,140(1-4):93-127
The New Horizons spacecraft will achieve a wide range of measurement objectives at the Pluto system, including color and panchromatic maps, 1.25–2.50 micron spectral images for studying surface compositions, and measurements of Pluto’s atmosphere (temperatures, composition, hazes, and the escape rate). Additional measurement objectives include topography, surface temperatures, and the solar wind interaction. The fulfillment of these measurement objectives will broaden our understanding of the Pluto system, such as the origin of the Pluto system, the processes operating on the surface, the volatile transport cycle, and the energetics and chemistry of the atmosphere. The mission, payload, and strawman observing sequences have been designed to achieve the NASA-specified measurement objectives and maximize the science return. The planned observations at the Pluto system will extend our knowledge of other objects formed by giant impact (such as the Earth–moon), other objects formed in the outer solar system (such as comets and other icy dwarf planets), other bodies with surfaces in vapor-pressure equilibrium (such as Triton and Mars), and other bodies with N2:CH4 atmospheres (such as Titan, Triton, and the early Earth). 相似文献
5.
6.
7.
Andrew J. Ball Michael E. Price Roger J. Walker Glyn C. Dando Nigel S. Wells John C. Zarnecki 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
We describe a Mars ‘Micro Mission’ for detailed study of the martian satellites Phobos and Deimos. The mission involves two ∼330 kg spacecraft equipped with solar electric propulsion to reach Mars orbit. The two spacecraft are stacked for launch: an orbiter for remote investigation of the moons and in situ studies of their environment in Mars orbit, and another carrying a lander for in situ measurements on the surface of Phobos (or alternatively Deimos). Phobos and Deimos remain only partially studied, and Deimos less well than Phobos. Mars has almost always been the primary mission objective, while the more dedicated Phobos project (1988–89) failed to realise its full potential. Many questions remain concerning the moons’ origins, evolution, physical nature and composition. Current missions, such as Mars Express, are extending our knowledge of Phobos in some areas but largely neglect Deimos. The objectives of M-PADS focus on: origins and evolution, interactions with Mars, volatiles and interiors, surface features, and differences. The consequent measurement requirements imply both landed and remote sensing payloads. M-PADS is expected to accommodate a 60 kg orbital payload and a 16 kg lander payload. M-PADS resulted from a BNSC-funded study carried out in 2003 to define candidate Mars Micro Mission concepts for ESA’s Aurora programme. 相似文献
8.
9.
Flow corridors are a new class of trajectory-based airspace which derives from the next generation air transportation system concept of operations. Reducing the airspace complexity and increasing the capacity are the main purposes of the en-route corridor. This paper analyzes the collision risk-capacity tradeoff using a combined discrete–continuous simulation method. A basic two-dimensional en-route flow corridor with performance rules is designed as the operational environment. A second-order system is established by combining the point mass model and the proportional derivative controller together to simulate the self-separation operations of the aircrafts in the corridor and the operation performance parameters from the User Manual for the Base of Aircraft Data are used in this research in order to improve the reliability. Simulation results indicate that the aircrafts can self-separate from each other efficiently by adjusting their velocities,and rationally setting the values of some variables can improve the rate and stability of the corridor with low risks of loss of separation. 相似文献
10.
Numerical simulations of energy depositions in the middle and upper solar chromosphere result in ejection of chromospheric material into the corona and heating of the chromospheric gas. These simulations may be capable of describing some of the features seen by the soft X-ray telescope on board theYohkoh satellite. 相似文献