全文获取类型
收费全文 | 2274篇 |
免费 | 10篇 |
国内免费 | 10篇 |
专业分类
航空 | 1111篇 |
航天技术 | 815篇 |
综合类 | 10篇 |
航天 | 358篇 |
出版年
2021年 | 22篇 |
2018年 | 38篇 |
2017年 | 21篇 |
2016年 | 26篇 |
2014年 | 48篇 |
2013年 | 57篇 |
2012年 | 49篇 |
2011年 | 91篇 |
2010年 | 64篇 |
2009年 | 91篇 |
2008年 | 98篇 |
2007年 | 53篇 |
2006年 | 47篇 |
2005年 | 59篇 |
2004年 | 70篇 |
2003年 | 73篇 |
2002年 | 38篇 |
2001年 | 58篇 |
2000年 | 39篇 |
1999年 | 47篇 |
1998年 | 67篇 |
1997年 | 42篇 |
1996年 | 67篇 |
1995年 | 79篇 |
1994年 | 56篇 |
1993年 | 49篇 |
1992年 | 64篇 |
1991年 | 31篇 |
1990年 | 20篇 |
1989年 | 49篇 |
1988年 | 24篇 |
1987年 | 20篇 |
1986年 | 22篇 |
1985年 | 83篇 |
1984年 | 53篇 |
1983年 | 54篇 |
1982年 | 60篇 |
1981年 | 72篇 |
1980年 | 21篇 |
1979年 | 27篇 |
1978年 | 27篇 |
1977年 | 27篇 |
1976年 | 20篇 |
1975年 | 20篇 |
1974年 | 20篇 |
1973年 | 11篇 |
1972年 | 14篇 |
1970年 | 18篇 |
1969年 | 19篇 |
1967年 | 10篇 |
排序方式: 共有2294条查询结果,搜索用时 171 毫秒
661.
F. Nagase S. Watanabe 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2006,38(12):2737-2741
This article briefly reviews first the progress of spectroscopy in X-ray astronomy from proportional counters, a major instrument in early phase of X-ray astronomy, to gas scintillation proportional counters, X-ray CCD cameras, transmission and reflection gratings, and finally to X-ray micro-calorimeters. As a typical example of spectral features observed from high mass X-ray binaries (HMXBs), the spectra observed from Vela X-1 with Chandra grating spectrometers are then presented and compared with computer simulations for high mass binary systems. 相似文献
662.
Large-scale structure formation, accretion and merging processes, AGN activity produce cosmological gas shocks. The shocks
convert a fraction of the energy of gravitationally accelerated flows to internal energy of the gas. Being the main gas-heating
agent, cosmological shocks could amplify magnetic fields and accelerate energetic particles via the multi-fluid plasma relaxation
processes. We first discuss the basic properties of standard single-fluid shocks. Cosmological plasma shocks are expected
to be collisionless. We then review the plasma processes responsible for the microscopic structure of collisionless shocks.
A tiny fraction of the particles crossing the shock is injected into the non-thermal energetic component that could get a
substantial part of the ram pressure power dissipated at the shock. The energetic particles penetrate deep into the shock
upstream producing an extended shock precursor. Scaling relations for postshock ion temperature and entropy as functions of
shock velocity in strong collisionless multi-fluid shocks are discussed. We show that the multi-fluid nature of collisionless
shocks results in excessive gas compression, energetic particle acceleration, precursor gas heating, magnetic field amplification
and non-thermal emission. Multi-fluid shocks provide a reduced gas entropy production and could also modify the observable
thermodynamic scaling relations for clusters of galaxies. 相似文献
663.
“Life” is an empirical concept whose various definitions and phenomenological characterizations depend on historical frameworks. Although analysis of existing literature suggests that attempts to define life will remain, at best, a work in progress, the history of biology shows that some efforts have been more fruitful than others. There is a major distinction between natural selection—which is clearly a defining trait of biology—and the changes that result from purely physical chemical evolution, which can be observed in nonbiological complex systems. Accordingly, it can be concluded that life cannot be understood without considering the presence of genetic material and Darwinian evolution. This shows the usefulness of the suggestion that life can be considered as a self-sustaining chemical system (i.e., one that turns environmental resources into its own building blocks) that is capable of undergoing natural selection. 相似文献
664.
H.S. Sawant N. Srivastava H.E. Trigoso J.H.A. Sobral F.C.R. Fernandes J.R. Cecatto K.R. Subramanian 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1997,20(12):2359-2363
Radio observations of the eclipse on November 3, 1994, were carried out at Chapecó, Brazil by using a decimetric spectrograph having high spectral and time resolution. The light curve shows that: (1) Time variation of the radio flux before the totality was more compared to that after. (2) During the totality radio emission at 1.5 GHz was observed. Advantage of high spatial resolution ( 3.2 arc sec) possible during solar eclipse enabled us to determine the height of radio emission at 1.5 GHz. (3) Microwave bursts were observed associated with metric Type III-RS bursts. The source size of one of the microwave bursts was 7 arc sec and its physical parameters have been estimated. (4) The time difference between radio and optical contacts suggested for the first time asymmetrical limb brightening at 1.5 GHz. 相似文献
665.
M.R. Leese J.A.M. McDonnell S.F. Green E. Busoletti B.C. Clark L. Colangeli J.F. Crifo P. Eberhardt F. Giovane E. Grün B. Gustafson D.W. Hughes D. Jackson P. Lamy Y. Langevin I. Mann S. McKenna-Lawlor W.G. Tanner P.R. Weissman J.C. Zarnecki 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1996,17(12):137-140
666.
E. C. Stone R. E. Vogt F. B. McDonald B. J. Teegarden J. H. Trainor J. R. Jokipii W. R. Webber 《Space Science Reviews》1977,21(3):355-376
A cosmic-ray detector system (CRS) has been developed for the Voyager mission which will measure the energy spectrum of electrons from 3–110 MeV and the energy spectra and elemental composition of all cosmic-ray nuclei from hydrogen through iron over an energy range from 1–500 MeV/nuc. Isotopes of hydrogen through sulfur will be resolved from 2–75 MeV/nuc. Studies with CRS data will provide information on the energy content, origin and acceleration process, life history, and dynamics of cosmic rays in the galaxy, and contribute to an understanding of the nucleosynthesis of elements in the cosmic-ray sources. Particular emphasis will be placed on low-energy phenomena that are expected to exist in interstellar space and are known to be present in the outer Solar System. This investigation will also add to our understanding of the transport of cosmic rays, Jovian electrons, and low-energy interplanetary particles over an extended region of interplanetary space. A major contribution to these areas of study will be the measurement of three-dimensional streaming patterns of nuclei from H through Fe and electrons over an extended energy range, with a precision that will allow determination of anisotropies down to 1%. The required combination of charge resolution, reliability and redundance has been achieved with systems consisting entirely of solid-state charged-particle detectors.Principal Investigator of the Voyager Cosmic Ray Experiment. 相似文献
667.
G. K. Parks C. Gurgiolo C. S. Lin K. A. Anderson R. P. Lin F. Martel H. Réme 《Space Science Reviews》1978,22(6):765-776
This article presents some of the new and important particle features that have been detected in the energy range 1 keV to 290 keV by the ISEE-1 and -2 spacecraft near the magnetopause, bow shock, and the interplanetary space. Only examples of data from the first few orbits, when the spacecraft were on the front side, are shown.Paper presented at 13th ESLAB Symposium, Innsbruck, Austria (June 5, 1978). 相似文献
668.
669.
670.
Forestieri A.F. Baraona C.R. 《IEEE transactions on aerospace and electronic systems》1984,(6):666-671
A Space Station Task Force was established by NASA in May 1982 to provide focus and direction for space station planning activities. The Task Force also provides Congress and the Administration with sufficient information to allow them to make an informed decision on whether the United States should proceed with a space station as the next major national initiative in space. This paper presents the status of planning activities to date, with major emphasis on the power system, and discusses technology options, power requirements, and schedule. 相似文献