全文获取类型
收费全文 | 6738篇 |
免费 | 9篇 |
国内免费 | 16篇 |
专业分类
航空 | 3189篇 |
航天技术 | 2274篇 |
综合类 | 24篇 |
航天 | 1276篇 |
出版年
2021年 | 45篇 |
2019年 | 41篇 |
2018年 | 205篇 |
2017年 | 158篇 |
2016年 | 95篇 |
2015年 | 48篇 |
2014年 | 114篇 |
2013年 | 159篇 |
2012年 | 174篇 |
2011年 | 318篇 |
2010年 | 253篇 |
2009年 | 340篇 |
2008年 | 389篇 |
2007年 | 266篇 |
2006年 | 138篇 |
2005年 | 200篇 |
2004年 | 175篇 |
2003年 | 195篇 |
2002年 | 120篇 |
2001年 | 184篇 |
2000年 | 94篇 |
1999年 | 138篇 |
1998年 | 165篇 |
1997年 | 120篇 |
1996年 | 121篇 |
1995年 | 171篇 |
1994年 | 199篇 |
1993年 | 107篇 |
1992年 | 130篇 |
1991年 | 64篇 |
1990年 | 69篇 |
1989年 | 127篇 |
1988年 | 49篇 |
1987年 | 52篇 |
1986年 | 60篇 |
1985年 | 205篇 |
1984年 | 164篇 |
1983年 | 142篇 |
1982年 | 139篇 |
1981年 | 215篇 |
1980年 | 58篇 |
1979年 | 68篇 |
1978年 | 58篇 |
1977年 | 49篇 |
1976年 | 38篇 |
1975年 | 45篇 |
1974年 | 40篇 |
1973年 | 44篇 |
1972年 | 51篇 |
1970年 | 32篇 |
排序方式: 共有6763条查询结果,搜索用时 703 毫秒
641.
M.B. Moldwin D. Fiello E. Harter G. Holman N. Nagumo A. Pryharski C. Takunaga 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
An elementary science education professional development partnership between Culver City Unified School District teachers and UCLA has been formed. The project was designed to assist teachers to comfortably present introductory space science concepts, to support them in their efforts, and to aid them in encouraging their students to develop inquiry skills related to space sciences. The project encourages teacher use of observational science techniques in their classrooms, the use of NASA solar mission images and enhanced use of astronomical observation to facilitate discovery learning. The integrated approach of the project has fostered collegial learning activities among the participating teachers and offered them opportunities for continued renewal and professional development of teacher competencies in astronomy and space science. The activities used in the classroom were developed by others, classroom tested, and specifically address National Science Education and California Science Content Standards. These activities have been sustained through on-going collaboration between the scientist and the teachers, a summer Research Experience for Teachers program, and on-going, grade-specific, district-sponsored workshops. Assessment of the value of the program is done by the school district and is used to continuously improve each workshop and program component. Culver City (California) Unified School District is a small urban school district located on the Westside of Los Angeles. This paper describes the program and the plans for incorporating IHY-themed science into the classroom. 相似文献
642.
Yihua Zheng Anthony T.Y. Lui Mei-Ching Fok Brian J. Anderson Pontus C. Brandt Donald G. Mitchell 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(8):1234-1242
One essential component of magnetosphere and ionosphere coupling is the closure of the ring current through Region 2 field-aligned current (FAC). Using the Comprehensive Ring Current Model (CRCM), which includes magnetosphere and ionosphere coupling by solving the kinetic equation of ring current particles and the closure of the electric currents between the two regions, we have investigated the effects of high latitude potential, ionospheric conductivity, plasma sheet density and different magnetic field models on the development of Region 2 field-aligned currents, and the relationship between R2 FACs and the ring current. It is shown that an increase in high latitude potential, ionospheric conductivity or plasma sheet density generally results in an increase in Region 2 FACs’ intensity, but R2 FACs display different local time and latitudinal distributions for changes in each parameter due to the different mechanisms involved. Our simulation results show that the magnetic field configuration of the inner magnetosphere is also an important factor in the development of Region 2 field-aligned current. More numerical experiments and observational results are needed in further our understanding of the complex relationship of the two current systems. 相似文献
643.
S.P. Teng Y.K. Chen K.S. Cheng H.C. Lo 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(11):1744-1754
Remote sensing images and technologies have been widely applied to environmental monitoring, in particular landuse/landcover classification and change detection. However, the uncertainties involved in such applications have not been fully addressed. In this paper two hypothesis-test-based change detection methods, namely the bivariate joint distribution method and the conditional distribution method, are proposed to tackle the uncertainties in change detection by making decisions based on the desired level of significance. Both methods require a data set of class-dependent no-change pixels to form the basis for class-dependent hypothesis test. Using an exemplar study area in central Taiwan, performance of the proposed methods are shown to be significantly superior to two other commonly applied methods (the post-classification comparison and the image differencing methods) in terms of the overall change detection accuracies. The conditional distribution method takes into consideration the correlation between digital numbers of the pre- and post-images and the effect of the known pre-image digital number on the range of the post-image digital number, and therefore yields the highest change detection accuracy. It is also demonstrated that the class-dependent change detection is crucial for accurate landuse/landcover change detection. 相似文献
644.
Stephen W. Bougher Pierre-Louis Blelly Michael Combi Jane L. Fox Ingo Mueller-Wodarg Aaron Ridley Raymond G. Roble 《Space Science Reviews》2008,139(1-4):107-141
Numerical modeling tools can be used for a number of reasons yielding many benefits in their application to planetary upper atmosphere and ionosphere environments. These tools are commonly used to predict upper atmosphere and ionosphere characteristics and to interpret measurements once they are obtained. Additional applications of these tools include conducting diagnostic balance studies, converting raw measurements into useful physical parameters, and comparing features and processes of different planetary atmospheres. This chapter focuses upon various classes of upper atmosphere and ionosphere numerical modeling tools, the equations solved and key assumptions made, specified inputs and tunable parameters, their common applications, and finally their notable strengths and weaknesses. Examples of these model classes and their specific applications to individual planetary environments will be described. 相似文献
645.
Algorithms for determining fixed-pitch propeller parameters and some flight characteristics of a superlight aircraft at the early stage of designing are described. 相似文献
646.
Richard G. Lugar 《Space Policy》1985,1(3):231-236
Senator Lugar argues that a better European appreciation of the SDI is essential to try to define the roles of the US allies in the programme. A number of guidelines for allied participation should be applied, covering mode of participation, areas for participation, responsibilities under treaty provisions, technology transfer and security safeguards. Bilateral agreements are viewed as the mode for proceeding, but it is incumbent on the US government to outline the next steps it evisages to come to grips with the political considerations that will influence allied calculations on whether and under what circumstances to participate in SDI research. 相似文献
647.
Yu.K. Chasovitin V.B. Shushkova T.N. Sykilinda P.F. Denisenko V.V. Sotsky N.E. Shejdakov 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1985,5(7):21-24
Our empirical model of electron density (ne) for quiet and weakly disturbed geomagnetic conditions (Kp not greater 4) takes account of comparative analysis of existing models and of experimental data obtained by rockets and incoherent scatter radar. The model describes the ne distribution in the 80 to 200 km height range at low and middle latitudes, and to some extent, in the subauroral region. It is presented in analytical form thus allowing one to calculate electron density profiles for any time. The electron density distribution at 140 km depends on the season (day of the year) and on the solar zenith angle. Profile variations during the day are for one season shown. Different from other models, ours specifies the variations during sunrise and sunset and reflects the particular profile shape at night admitting the occurrence of an intermediate layer. 相似文献
648.
J. Heise J.A.M. Bleeker A.C. Brinkman E. Gronenschild F. Paerels M. Grewing C. Wulf-Mathies K. Beuerman 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1985,5(3):61-64
EXOSAT has observed 19 hot white dwarfs with alleged strong soft X-ray emission. Positive detection of a large fraction of this sample was obtained, among these practically all hot DA dwarfs. High-resolution spectral data, acquired with the 500 1/mm grating spectrometer, indicates no traces of He in the atmosphere of HZ43, i.e. n(He)/n(H) ? 10?5 at a photospheric temperature of 60000 K (log g = 8). In contrast, the hot DA1 dwarf Feige 24 shows the presence of an appreciable He-abundance (n(He)/n(H) ? 10?3); however no simple homogeneously mixed H/He atmosphere can explain the observed spectral shape. 相似文献
649.
T.J. Stuchi T. Yokoyama A.A. Corrêa R.H. Solórzano D.M. Sanchez S.M.G. Winter O.C. Winter 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
The problem of a spacecraft orbiting the Neptune–Triton system is presented. The new ingredients in this restricted three body problem are the Neptune oblateness and the high inclined and retrograde motion of Triton. First we present some interesting simulations showing the role played by the oblateness on a Neptune’s satellite, disturbed by Triton. We also give an extensive numerical exploration in the case when the spacecraft orbits Triton, considering Sun, Neptune and its planetary oblateness as disturbers. In the plane a × I (a = semi-major axis, I = inclination), we give a plot of the stable regions where the massless body can survive for thousand of years. Retrograde and direct orbits were considered and as usual, the region of stability is much more significant for the case of direct orbit of the spacecraft (Triton’s orbit is retrograde). Next we explore the dynamics in a vicinity of the Lagrangian points. The Birkhoff normalization is constructed around L2, followed by its reduction to the center manifold. In this reduced dynamics, a convenient Poincaré section shows the interplay of the Lyapunov and halo periodic orbits, Lissajous and quasi-halo tori as well as the stable and unstable manifolds of the planar Lyapunov orbit. To show the effect of the oblateness, the planar Lyapunov family emanating from the Lagrangian points and three-dimensional halo orbits are obtained by the numerical continuation method. 相似文献
650.
E.G. Shelley 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1985,5(4):401-410
Energetic ion composition measurements have now been performed from earth orbiting satellites for more than a decade. As early as 1972 we knew that energetic (keV) ions of terrestrial origin represented a non-negligible component of the storm time ring current. We have now assembled a significant body of knowledge concerning energetic ion composition throughout much of the earth's magnetosphere. We know that terrestrial ions are a common component of the hot equatorial magnetospheric plasma in the ring current and the plasma sheet out to ? 23 RE. During periods of enhanced geomagnetic activity this component may become dominant. There is also clear evidence that the terrestrial component (specifically O+) is strongly dependent on solar cycle. Terrestrial ion source, transport, and acceleration regions have been identified in the polar auroral region, over the polar caps, in the magnetospheric boundary layers, and within the magnetotail lobes and plasma sheet boundary layer. Combining our present knowledge of these various magnetospheric ion populations, it is concluded that the primary terrestrial ion circulation pattern associated with enhanced geomagnetic activity involves direct injection from the auroral ion acceleration region into the plasma sheet boundary layer and central plasma sheet. The observed terrestrial component of the magnetospheric boundary layer and magnetotail lobes are inadequate to provide the required influx. They may, however, contribute significantly to the maintenence of the plasma sheet terrestrial ion population, particularly during periods of reduced geomagnetic activity. It is further concluded, on the basis of the relative energy distributions of H+ and O+ in the plasma sheet, that O+ probably contributes significantly to the ring current population at energies inaccessible to present ion composition instrumentation (? 30 keV). 相似文献