全文获取类型
收费全文 | 5641篇 |
免费 | 27篇 |
国内免费 | 23篇 |
专业分类
航空 | 2807篇 |
航天技术 | 1961篇 |
综合类 | 13篇 |
航天 | 910篇 |
出版年
2021年 | 35篇 |
2019年 | 33篇 |
2018年 | 78篇 |
2017年 | 55篇 |
2016年 | 53篇 |
2015年 | 36篇 |
2014年 | 108篇 |
2013年 | 148篇 |
2012年 | 132篇 |
2011年 | 194篇 |
2010年 | 136篇 |
2009年 | 209篇 |
2008年 | 283篇 |
2007年 | 153篇 |
2006年 | 118篇 |
2005年 | 150篇 |
2004年 | 143篇 |
2003年 | 173篇 |
2002年 | 112篇 |
2001年 | 179篇 |
2000年 | 97篇 |
1999年 | 133篇 |
1998年 | 156篇 |
1997年 | 116篇 |
1996年 | 167篇 |
1995年 | 202篇 |
1994年 | 186篇 |
1993年 | 105篇 |
1992年 | 145篇 |
1991年 | 68篇 |
1990年 | 60篇 |
1989年 | 142篇 |
1988年 | 54篇 |
1987年 | 51篇 |
1986年 | 61篇 |
1985年 | 167篇 |
1984年 | 168篇 |
1983年 | 111篇 |
1982年 | 136篇 |
1981年 | 173篇 |
1980年 | 50篇 |
1979年 | 60篇 |
1978年 | 57篇 |
1977年 | 38篇 |
1975年 | 56篇 |
1974年 | 44篇 |
1973年 | 36篇 |
1972年 | 48篇 |
1969年 | 35篇 |
1967年 | 36篇 |
排序方式: 共有5691条查询结果,搜索用时 93 毫秒
911.
J.C. Henoux G. Chambe M. Semel B. Woodgate R. Shine J. Beckers 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1982,2(11):155-158
Linear polarization was observed in the S I 1437Å line in bright flaring points during the soft X-ray emission. The degree of polarization is about 25% and is detected at a signal to noise ratio of 2.9. The polarized electric vector is directed towards disk center to within 3°.This polarization could be due to collisional excitationm of S I by energetic electrons beamed in the vertical direction. We suggest that the heat flux in the region interconnecting the transition zone to the high chromosphere during the gradual phase of a flare could lead to an anisotropic excitation. Then the observed polarization would be due to vertical motions of the transition zone sweeping the preexisting chromosphere. 相似文献
912.
G.E. Thomas 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(12):127-130
It is often observed that the stratospheric and mesospheric temperature structure undergoes transient disturbances from its averaged steady-state behavior. The causes may be traceable to gravity waves, planetary waves, solar proton and relativistic electron precipitation, etc. We examine the theoretical time behavior of the atmospheric temperature following the cessation of such heating phenomena as it relaxes toward its quiescent steady-state value. We also study the time-dependent response during a model stratospheric-warming/mesospheric-cooling event. In particular, we investigate the roles of eddy heat conduction, non-LTE cooling in the 15μm CO2 band, and an ambient vertical wind, and their relative importance as they depend upon altitude and time, in modifying temperature changes in this region. 相似文献
913.
ROSETTA — the Comet Nucleus Sample Return mission — is one of the four Cornerstone missions to which ESA has committed itself in its approved Long-Term Programme Horizon 2000. The mission is currently being studied in collaboration with NASA. The comet-nucleus samples that ROSETTA is to provide will allow us to study some of the most primitive material in the solar system and the physical and chemical processes that marked the beginning of the system 4.6 billion years ago. For ESA, ROSETTA is a new type of mission: one which will return a sample at cryogenic temperature, and where as much effort has to be spent on preparing the laboratory analysis on-ground as has to be invested in preparing the space segment with the sample acquisition and in situ documentation. As part of the preparation for this mission, ESA is now starting to consider Planetary Protection issues. 相似文献
914.
C E Swenberg L S Myers J H Miller 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1994,14(10):181-201
The relation between the site of energy deposition and the site of its biological action is an important question in radiobiology. Even at 77 degrees K, evidence is clear that these two sites must be separated since energy deposition is random but specific products are formed. Several processes that may contribute to this separation are: 1) hole migration and stabilization through deprotonation to give neutral oxidation product radicals; 2) electron trapping and transfer to form specific radical anions, possibly followed by protonation to give neutral reduction product radicals; and 3) recombination of spatially separated charges or radicals. These microscopic processes will be reviewed critically in an analysis using electron paramagnetic resonance spectroscopy (EPR) evidence for and against long-range transfer of energy and/or charge in frozen, hydrated DNA. 相似文献
915.
An extended and unifying system identification technique is presented for a class of systems that include all main signal models that arise in the harmonic decomposition problem. This technique unifies and extends the previously developed system identification techniques which are improvements on the Pisarenko harmonic decomposition (or, its spatial dual, MUSIC) as they arise in arrays of sensors. The advantages of the technique and some of its specializations include having no assumptions of stationarity on the stochastic processes involved. Another contribution of this technique is that it can also be used without any resort to probability theoretic concepts, thus bypassing the approximation of autocorrelations via time averages, yielding the system parameters exactly. This technique can be utilized to determine the dominant modes of vibrations of flexible structures as well. An analogy is established between arrays of sensors for target signal returns and those that can be used for vibrations in flexible structures. This enables the results developed for each one of these problems to be applied to the other 相似文献
916.
Lin C.L. Shieh N.C. Tung P.C. 《IEEE transactions on aerospace and electronic systems》2002,38(3):918-932
Design, simulation and experimental implementation of a wavelet basis function network learning controller for linear brushless dc motors (LBDCM) are considered. Stability robustness with position tracking is the primary concern. The proposed controller deals mainly with external disturbances, e.g. nonlinear friction force and payload variation in motion control of linear motors. It consists of two parts, one is a state feedback component, and the other one is a learning feedback component. The state feedback controller is designed on the basis of a simple linear model, and the learning feedback component is a wavelet neural controller. The attenuation effect of wavelet neural networks on friction force is first verified by the numerical method. The learning effect of wavelet neural networks on friction force is also shown in the numerical results. Then, a wavelet neural network is applied on a real LBDCM to on-line suppress the friction force, which may be variable due to the different lubrication. The effectiveness of the proposed control schemes is demonstrated by simulated and experimental results. 相似文献
917.
Smart M.C. Ratnakumar B.V. Whitcanack L. Chin K. Rodriguez M. Surampudi S. 《Aerospace and Electronic Systems Magazine, IEEE》2002,17(12):16-20
The low temperature charge and discharge characteristics of experimental MCMB-Li/sub x/Ni/sub y/Co/sub 1-y/O/sub 2/ cells containing different electrolytes were investigated. The use of low ethylene carbonate (EC)-content electrolyte formulations has resulted in good discharge performance to temperatures as low as -40/spl deg/C. The effect of charge voltage and charge current upon the individual electrode potentials at low temperature was investigated using the three electrode cells (containing lithium reference electrodes). In some cases, lithium plating was observed to occur upon low temperature charge, and found to be facilitated by high charge voltages, high charge currents, and poor anode kinetics. Electrochemical characterization of the cells has helped to establish the conditions under which lithium plating can occur by providing information regarding the polarization effects present at each electrode. 相似文献
918.
J. E. Grindlay 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1993,13(12):597-609
In the past three years, a new era of study of globular clusters has begun with multiwavelength observations from the current generation of astronomical telescopes in space. We review the recent results obtained from our studies of compact binaries and x-ray sources in globulars with ROSAT and HST as well as our balloon-borne hard x-ray telescope EXITE and ground-based observations (CTIO). With ROSAT, we have obtained the most sensitive high resolution soft x-ray images of clusters which show multiple low luminosity sources in cluster cores that are likely indicative of the long-sought population of cataclysmic variables (CVs). We have obtained deep H images of two clusters with HST and found CV candidates for 3 of the ROSAT sources in the core of NGC 6397. New CTIO imaging and spectroscopy of two ‘dim source’ fields in ω-Cen are also described. With EXITE we carried out the first hard x-ray imaging observations of the cluster 47 Tuc; such studies can ultimately limit the populations of millisecond pulsars and pulsar emission mechanisms. A long ROSAT exposure on 47 Tuc also shows probable cluster diffuse emission, possibly due to hot gas from ablating millisecond pulsars. Multiwavelength studies of globular clusters may provide new constraints on problems as diverse as the origin of CVs and LMXBs and the origin of hot gas in globulars. 相似文献
919.
Nearly optimum quantization levels for multileveled quantizers in radar receivers and distributed-detection are calculated for preassigned false-alarm probability Q 0 by maximizing the detection probability Q d after replacing both Q 0 and (1-Q d) by the saddlepoint approximations. Narrowband signals of random phase and with both fixed and Rayleigh-fading amplitudes in Gaussian noise are treated, and the loss in signal detectability incurred by quantization is estimated 相似文献
920.
Narayanan R.M. Doerr D.W. Rundquist D.C. 《IEEE transactions on aerospace and electronic systems》1992,28(2):404-412
The temporal decorrelation characteristics of X -band radar backscatter from wind-influenced vegetation were investigated using a short-range CW radar. Radar reflectance data were gathered on various types of individual trees from a distance of approximately 30 m. The windspeed was monitored during each measurement, which lasted 5 s. The crown cover and the mean leaf area of the trees were also recorded. Autocovariance plots were generated for each measurement, from which the decorrelation time was estimated. As expected, the return signals decorrelated faster at higher wind speeds. However, the decorrelation time was also found to depend on the tree type, tree structure, and leaf cover characteristics. Measured decorrelation times for moderate winds (7-9 m/s) were often between 40-60 ms, although the lowest decorrelation time measured under these conditions was 14 ms for the Eastern Cottonwood. In lighter winds (1-4 m/s), decorrelation times were much longer, and there was substantial spread in the data 相似文献