全文获取类型
收费全文 | 5991篇 |
免费 | 51篇 |
国内免费 | 34篇 |
专业分类
航空 | 2803篇 |
航天技术 | 2262篇 |
综合类 | 82篇 |
航天 | 929篇 |
出版年
2021年 | 56篇 |
2019年 | 37篇 |
2018年 | 96篇 |
2017年 | 80篇 |
2016年 | 63篇 |
2015年 | 45篇 |
2014年 | 126篇 |
2013年 | 158篇 |
2012年 | 146篇 |
2011年 | 232篇 |
2010年 | 166篇 |
2009年 | 235篇 |
2008年 | 350篇 |
2007年 | 175篇 |
2006年 | 165篇 |
2005年 | 167篇 |
2004年 | 139篇 |
2003年 | 190篇 |
2002年 | 140篇 |
2001年 | 174篇 |
2000年 | 135篇 |
1999年 | 153篇 |
1998年 | 165篇 |
1997年 | 132篇 |
1996年 | 133篇 |
1995年 | 176篇 |
1994年 | 179篇 |
1993年 | 110篇 |
1992年 | 133篇 |
1991年 | 70篇 |
1990年 | 71篇 |
1989年 | 133篇 |
1988年 | 60篇 |
1987年 | 59篇 |
1986年 | 57篇 |
1985年 | 195篇 |
1984年 | 144篇 |
1983年 | 130篇 |
1982年 | 127篇 |
1981年 | 176篇 |
1980年 | 50篇 |
1979年 | 64篇 |
1978年 | 53篇 |
1977年 | 39篇 |
1976年 | 34篇 |
1975年 | 48篇 |
1974年 | 34篇 |
1972年 | 45篇 |
1971年 | 34篇 |
1969年 | 29篇 |
排序方式: 共有6076条查询结果,搜索用时 203 毫秒
741.
J W Wilson R K Tripathi G D Qualls F A Cucinotta R E Prael J W Norbury J H Heinbockel J Tweed 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2004,34(6):1319-1327
Improved spacecraft shield design requires early entry of radiation constraints into the design process to maximize performance and minimize costs. As a result, we have been investigating high-speed computational procedures to allow shield analysis from the preliminary design concepts to the final design. In particular, we will discuss the progress towards a full three-dimensional and computationally efficient deterministic code for which the current HZETRN evaluates the lowest-order asymptotic term. HZETRN is the first deterministic solution to the Boltzmann equation allowing field mapping within the International Space Station (ISS) in tens of minutes using standard finite element method (FEM) geometry common to engineering design practice enabling development of integrated multidisciplinary design optimization methods. A single ray trace in ISS FEM geometry requires 14 ms and severely limits application of Monte Carlo methods to such engineering models. A potential means of improving the Monte Carlo efficiency in coupling to spacecraft geometry is given in terms of re-configurable computing and could be utilized in the final design as verification of the deterministic method optimized design. 相似文献
742.
The study of the electrical environment of the Earth's atmosphere has rapidly advanced during the past century. Great strides have been made towards the understanding of lightning and thunderstorms and in relating them to the global electric circuit. The electromagnetic fields and currents connect different parts of the Earth's environment, and any type of perturbation in one region affects another region. Starting from the traditional views in which the electrodynamics of one region has been studied in isolation from the neighboring regions, the modern theory of the global electrical circuit has been discussed briefly. Interconnection and electrodynamic coupling of various regions of the Earth's environment can be easily studied by using the global electric circuit model. Deficiencies in the model and the possibility of improvement in it have been suggested. Application of the global electric circuit model to the understanding of the Earth's changes of climate has been indicated. 相似文献
743.
E.B. Romanova O.M. Pirog N.M. Polekh A.V. Tashchilin G.A. Zherebtsov J.K. Shi X. Wang 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(4):569-578
The results of modeling of ionospheric disturbances observed in the East Asian region during moderate storms are presented. The numerical model for ionosphere–plasmasphere coupling developed at the ISTP SB RAS is used to interpret the data of observations at ionospheric stations located in the longitudinal sector of 90–130°E at latitudes from auroral zone to equator. There is obtained a reasonable agreement between measurements and modeling results for winter and equinox. In the summer ionosphere, at the background of high ionization by the solar EUV radiation in the quiet geomagnetic period the meridional thermospheric wind strongly impacts the electron concentration in the middle and auroral ionosphere. The consistent calculations of the thermospheric wind permit to obtain the model results which are closer to summer observations. The actual information about the space-time variations of thermosphere and magnetosphere parameters should be taken into account during storms. 相似文献
744.
The objective of this paper is to make a picture of the recent articles published on information fusion. Indeed, a great number of documents dealing with this technique are available in the literature. A classification scheme including application fields, fusion goals, fusion system architecture and mathematical tools is proposed. This overview of the last three years allows us to compute the article distribution into each class. Finally, some elements of preliminary analysis of this classification are drawn 相似文献
745.
S. L. Shalimov 《Cosmic Research》2001,39(6):559-563
The nonstationary process of the accumulation of ions of meteoric origin, which is caused by propagation of planetary waves at altitudes of the lower ionosphere, is considered. Based on horizontal and vertical ion drift in planetary waves, a possibility of plasma density increases by a factor of 10–20 in comparison with the background concentration is demonstrated. This process takes place in areas of cyclonic motion with a scale of the order of 1500 km. The connection of this process with subsequent formation of midlatitude sporadic layers and irregularities producing radio reflections is considered. It is shown that the action of planetary waves on ions of meteoric origin is a necessary element in the scheme of the occurrence of midlatitude sporadic layers. 相似文献
746.
J Birn M Hesse K Schindler 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1997,19(12):1763-1771
Magnetic reconnection in traditional, two-dimensional theory can be closely associated with topological properties of the magnetic field, separatrices, neutral lines, or separators. Such well-defined topological properties may no longer exist, or become hopelessly complicated, in more general three-dimensional configurations, that otherwise behave physically quite similarly to the two-dimensional configurations. We discuss generalized definitions of reconnection applied to such situations and illustrate typical properties with simulations of three-dimensional reconnection in the magnetotail. 相似文献
747.
M B Simakov E A Kuzicheva I L Malko 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1997,19(7):1059-1062
The abiogenic synthesis of pyrimidine nucleotides in solid state has been investigated. Our experiment indicates that natural nucleotides are produced in thin films prepared from nucleoside and inorganic phosphate by irradiating with vacuum ultraviolet light (VUV, lambda=100-200 nm). We have investigated the influence of the type of nucleic acids base (thymidine, cytosine, uracil) and the structure of sugar moiety (ribose or deoxyribose) on the course and yield of reaction. We compared the action of vacuum ultraviolet light with action of gamma-radiation, heat and biology significant UV (254 nm) which have been investigated earlier. The occurrence of these reaction in open space is discussed. 相似文献
748.
We report new calculations of transition radiation spectra which are correct for arbitrary energy of a particle at all frequencies down to plasma frequency. The importance of the emission mechanism for solar flares are discussed. 相似文献
749.
C. S. Zerefos D. S. Balis P. Zanis C. Meleti A. F. Bais K. Tourpali D. Melas I. Ziomas E. Galani K. Kourtidis A. Papayannis Z. Gogosheva 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2001,27(12):1955-1963
Intensive measurements of UV solar irradiance, total ozone and surface ozone were carried out during the solar eclipse of 11 August 1999 at Thessaloniki, Greece and Stara Zagora, Bulgaria, located very close to the footprint of the moon's shadow during the solar eclipse with the maximum coverage of the solar disk reaching about 90% and 96% respectively. It is shown that during the eclipse the diffuse component is reduced less compared to the decline of the direct solar irradiance at the shorter wavelengths. A 20-minute oscillation of erythemal UV-B solar irradiance was observed before and after the time of the eclipse maximum under clear skies, indicating a possible 20-minute fluctuation in total ozone presumably caused by the eclipse induced gravity waves. The surface ozone measurements at Thessaloniki display a decrease of around 10–15 ppbv during the solar eclipse. Similarly, ozone profile measurements with a lidar system indicate a decrease of ozone up to 2 km during the solar eclipse. The eclipse offered the opportunity to test our understanding of tropospheric ozone chemistry. The use of a chemical box model suggested that photochemistry can account for a significant portion of the observed surface ozone decrease. 相似文献
750.
Uncertainty ellipses and their application to interval estimation of emitter position 总被引:3,自引:0,他引:3
A method of interval estimation of position of an object emitting electromagnetic energy is presented. The problem is considered in cases of known and unknown errors of emitter position determination. Precise expressions concerning two-dimensional confidence regions for unknown position of the emitter have been obtained. Uncertainty regions defined as error ellipses and confidence ellipses have been determined. Qualitative and quantitative comparison of considered regions have been made. The presented approach and obtained results may be useful in electronic intelligence (ELINT) and electronic warfare (EW) applications, in radio navigation, ballistics, and in rescue operations at sea as well. 相似文献