全文获取类型
收费全文 | 7292篇 |
免费 | 14篇 |
国内免费 | 16篇 |
专业分类
航空 | 3433篇 |
航天技术 | 2579篇 |
综合类 | 23篇 |
航天 | 1287篇 |
出版年
2021年 | 57篇 |
2018年 | 184篇 |
2017年 | 125篇 |
2016年 | 96篇 |
2015年 | 51篇 |
2014年 | 172篇 |
2013年 | 201篇 |
2012年 | 198篇 |
2011年 | 293篇 |
2010年 | 202篇 |
2009年 | 316篇 |
2008年 | 404篇 |
2007年 | 205篇 |
2006年 | 167篇 |
2005年 | 220篇 |
2004年 | 200篇 |
2003年 | 240篇 |
2002年 | 141篇 |
2001年 | 245篇 |
2000年 | 114篇 |
1999年 | 159篇 |
1998年 | 191篇 |
1997年 | 139篇 |
1996年 | 148篇 |
1995年 | 209篇 |
1994年 | 215篇 |
1993年 | 118篇 |
1992年 | 148篇 |
1991年 | 78篇 |
1990年 | 72篇 |
1989年 | 138篇 |
1988年 | 66篇 |
1987年 | 65篇 |
1986年 | 72篇 |
1985年 | 192篇 |
1984年 | 179篇 |
1983年 | 149篇 |
1982年 | 148篇 |
1981年 | 239篇 |
1980年 | 68篇 |
1979年 | 63篇 |
1978年 | 63篇 |
1977年 | 52篇 |
1976年 | 54篇 |
1975年 | 53篇 |
1974年 | 50篇 |
1973年 | 49篇 |
1972年 | 59篇 |
1971年 | 40篇 |
1970年 | 40篇 |
排序方式: 共有7322条查询结果,搜索用时 372 毫秒
431.
An analysis of the data from the Wind and IMP-8 spacecraft revealed that a slow solar wind, flowing in the heliospheric plasma sheet, represents a set of magnetic tubes with plasma of increased density (N > 10cm-3 at the Earth's orbit). They have a fine structure at several spatial scales (fractality), from 2°-3°(at the Earth's orbit, it is equivalent to 3.6-5.4h, or (5.4-8.0)×106km) to the minimum about 0.025°, i.e. the angular size of the nested tubes is changed nearly by two orders of magnitude. The magnetic tubes at each observed spatial scale are diamagnetic, i.e. their surface sustains a flow of diamagnetic (or drift) current that decreases the magnetic field within the tube itself and increases it outside the tube. Furthermore, the value of β= 8π[N(Te + Tp)]/B2 within the tube exceeds the value of βoutside the tube. In many cases total pressure P = N(Te + Tp) + B2/8πis almost constant within and outside the tubes at any one of the aforementioned scales. 相似文献
432.
This paper analyzes the state of the ionosphere during two geomagnetic storms of a different intensity evolving in different sectors of local time in different seasons. There were used the data from a network of ionospheric stations located in the opposite longitudinal sectors of 80°-150° E and 250°-310° E.This analysis has permitted us to conclude that the detected differences in the variations of the disturbances are likely to be determined by the local time difference of the geomagnetic storm development, its intensity and by the different illumination conditions of the ionosphere. 相似文献
433.
434.
S.J. Wang D. Maia M. Pick G. Aulanier J.-M. Malherbe J.-P. Delaboudinire 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2005,36(12):2273
We present our research on a fast and decelerating partial halo coronal mass ejection (CME) event detected in multi-wavelengths in the chromosphere and the corona on 14 October, 1999. The event involved a whole complex active area which spanned more than 40° of heliolongitude. It included a strong solar flare (XI/1N) and a complex eruptive filament within an active region of the entire complex. Especially, several radio sources were detected in the decimetric range prior to the CME by the Nançay Radioheliograph (NRH). A linear force-free field extrapolation of the Michelson Doppler Imager (MDI) magnetogram was performed to calculate the magnetic topology of the complex prior to the triggering of the event. The presence of a coronal null point combined with the occurrence of two distant and nearly simultaneous radio sources put strong arguments in favor of the generalized breakout model for the triggering of the eruption. The analysis of the subsequent development of the event suggests that large interconnecting loops were ejected together with the CME. 相似文献
435.
V. S. Makhmutov P. Kaufmann J. E. R. Costa P. R. Lagrotta A. Magun K. Arzner G. A. Bazilevskaya M. A. Shea 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2002,29(12):1186-2104
Itapetinga measurements at 48 GHz with the multibeam technique are used to determine the relative position of solar burst centroid of emission with high spatial accuracy and time resolution. For the Great Bursts of October 19,22, 1989, with a large production of relativistic particles, and October 23, it is suggested that, at 48 GHz, the bursts might have originated in more then one source in space and time. Additionally the October 19 and 22 Ground Level Events exhibited very unusual intensity-time profiles including double component structures for the onset phase. The Bern observatory spectral radio emission data show a strong spectral flattening typical for large source inhomogeneties. The interpretation for this is that large solar flares are a superposition of a few strong bursts (separated both in space and time) in the same flaring region. 相似文献
436.
K.-L. Klein S. Krucker G. Trottet 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2003,32(12):2521-2526
Initial results of a combined study of electron events using the 3DP experiment on the WIND spacecraftand the Nançay Radioheliograph (NRH) are presented. A total of 57 electron events whose solar release time could be inferred from WIND/3DP observations occurred during NRH observing times. In 40 of them a distinct signature was detected in maps at decimetric and metric wavelengths (dm-m-λ) taken by the NRH. These events are equally distributed among two categories: (1) Electron release together with dm-m-λ bursts of a few minutes duration: these events are also accompanied by decametric-hectometric type III bursts seen by WAVES/WIND. They correspond to the well-known impulsive electron events. (2) Electron release during long duration (several tens of minutes) dm-m-λ emission: the electrons are most often released more than ten minutes after the start of the radio event. In the majority of cases the dm-m-λ radio source changes position, size, and/or intensity near the time of electron release. 相似文献
437.
F. Durret J. S. Kaastra J. Nevalainen T. Ohashi N. Werner 《Space Science Reviews》2008,134(1-4):51-70
An excess over the extrapolation to the extreme ultraviolet and soft X-ray ranges of the thermal emission from the hot intracluster
medium has been detected in a number of clusters of galaxies. We briefly present each of the satellites (EUVE, ROSAT PSPC
and BeppoSAX, and presently XMM-Newton, Chandra and Suzaku) and their corresponding instrumental issues, which are responsible
for the fact that this soft excess remains controversial in a number of cases. We then review the evidence for this soft X-ray
excess and discuss the possible mechanisms (thermal and non-thermal) which could be responsible for this emission. 相似文献
438.
M.O. Riazantseva O.V. Khabarova G.N. Zastenker J.D. Richardson 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2007,40(12):1802-1806
Sharp (<10 min) and large (>20%) solar wind ion flux changes are common phenomena in turbulent solar wind plasma. These changes are the boundaries of small- and middle-scale solar wind plasma structures which can have a significant influence on Earth’s magnetosphere. These solar wind ion flux changes are typically accompanied by only a small change in the bulk solar wind velocity, hence, the flux changes are driven mainly by plasma density variations. We show that these events occur more frequently in high-density solar wind. A characteristic of solar wind turbulence, intermittency, is determined for time periods with and without these flux changes. The probability distribution functions (PDF) of solar wind ion flux variations for different time scales are calculated for each of these periods and compared. For large time scales, the PDFs are Gaussian for both data sets. For small time scales, the PDFs from both data set are more flat than Gaussian, but the degree of flatness is much larger for the data near the sharp flux change boundaries. 相似文献
439.
H. Fuke Y. Tasaki K. Abe S. Haino Y. Makida S. Matsuda J.W. Mitchell A.A. Moiseev J. Nishimura M. Nozaki S. Orito J.F. Ormes M. Sasaki E.S. Seo Y. Shikaze R.E. Streitmatter J. Suzuki K. Tanaka T. Yamagami A. Yamamoto T. Yoshida K. Yoshimura 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(12):2050-2055
440.
K. Dolag S. Borgani S. Schindler A. Diaferio A. M. Bykov 《Space Science Reviews》2008,134(1-4):229-268
Modern cosmological observations allow us to study in great detail the evolution and history of the large scale structure
hierarchy. The fundamental problem of accurate constraints on the cosmological parameters, within a given cosmological model,
requires precise modelling of the observed structure. In this paper we briefly review the current most effective techniques
of large scale structure simulations, emphasising both their advantages and shortcomings. Starting with basics of the direct
N-body simulations appropriate to modelling cold dark matter evolution, we then discuss the direct-sum technique GRAPE, particle-mesh (PM) and hybrid methods, combining the PM and the tree algorithms. Simulations of baryonic matter in the Universe often use hydrodynamic codes based on both particle
methods that discretise mass, and grid-based methods. We briefly describe Eulerian grid methods, and also some variants of
Lagrangian smoothed particle hydrodynamics (SPH) methods. 相似文献