全文获取类型
收费全文 | 4219篇 |
免费 | 237篇 |
国内免费 | 426篇 |
专业分类
航空 | 2321篇 |
航天技术 | 1347篇 |
综合类 | 477篇 |
航天 | 737篇 |
出版年
2021年 | 29篇 |
2020年 | 46篇 |
2019年 | 23篇 |
2018年 | 56篇 |
2017年 | 54篇 |
2016年 | 44篇 |
2015年 | 67篇 |
2014年 | 126篇 |
2013年 | 149篇 |
2012年 | 120篇 |
2011年 | 157篇 |
2010年 | 186篇 |
2009年 | 187篇 |
2008年 | 235篇 |
2007年 | 144篇 |
2006年 | 143篇 |
2005年 | 144篇 |
2004年 | 130篇 |
2003年 | 135篇 |
2002年 | 79篇 |
2001年 | 148篇 |
2000年 | 136篇 |
1999年 | 157篇 |
1998年 | 187篇 |
1997年 | 148篇 |
1996年 | 164篇 |
1995年 | 133篇 |
1994年 | 163篇 |
1993年 | 120篇 |
1992年 | 132篇 |
1991年 | 79篇 |
1990年 | 66篇 |
1989年 | 104篇 |
1988年 | 39篇 |
1987年 | 48篇 |
1986年 | 67篇 |
1985年 | 90篇 |
1984年 | 60篇 |
1983年 | 65篇 |
1982年 | 58篇 |
1981年 | 69篇 |
1980年 | 36篇 |
1979年 | 27篇 |
1978年 | 25篇 |
1977年 | 24篇 |
1975年 | 24篇 |
1974年 | 24篇 |
1973年 | 24篇 |
1971年 | 31篇 |
1969年 | 25篇 |
排序方式: 共有4882条查询结果,搜索用时 15 毫秒
801.
The Goddard Experiment Package will measure the ultraviolet spectral emittance of stars and nebulae. It has a spectral resolution of 2 ? in the 1050-? to 4000-? band. The telescope has a 38-inch clear aperture and automatically reduces the spectral data to digital form. Guidance accuracy is 1 of second arc. 相似文献
802.
Henderson IW 《Journal of the British Interplanetary Society》1989,42(7):363-366
Under conditions of microgravity severe alterations in body fluid composition and volume take place largely as a result of "cardiothoracic pooling" or headward shift of blood. Inappropriate endocrine, renal and cardiovascular responses result from the "misreading" of homeostatic signals by physiological receptors to produce an as yet incompletely defined syndrome under microgravitational conditions. 相似文献
803.
Kirkpatrick AW Nicolaou S Rowan K Liu D Cunningham J Sargsyan AE Hamilton D Dulchavsky SA 《Acta Astronautica》2005,56(9-12):831-838
The recent interest in the use of ultrasound (US) to detect pneumothoraces after acute trauma in North America was initially driven by an operational space medicine concern. Astronauts aboard the International Space Station (ISS) are at risk for pneumothoraces, and US is the only potential medical imaging available. Pneumothoraces are common following trauma, and are a preventable cause of death, as most are treatable with relatively simple interventions. While pneumothoraces are optimally diagnosed clinically, they are more often inapparent even on supine chest radiographs (CXR) with recent series reporting a greater than 50% rate of occult pneumothoraces. In the course of basic scientific investigations in a conventional and parabolic flight laboratory, investigators familiarized themselves with the sonographic features of both pneumothoraces and normal pulmonary ventilation. By examining the visceral–parietal pleural interface (VPPI) with US, investigators became confident in diagnosing pneumothoraces. This knowledge was subsequently translated into practice at an American and a Canadian trauma center. The sonographic examination was found to be more accurate and sensitive than CXR (US 96% and 100% versus US 74% and 36%) in specific circumstances. Initial studies have also suggested that detecting the US features of pleural pulmonary ventilation in the left lung field may offer the ability to exclude serious endotracheal tube malpositions such as right mainstem and esophageal intubations. Applied thoracic US is an example of a clinically useful space medicine spin-off that is improving health care on earth. 相似文献
804.
Spherical harmonics are an integral part of the study of stellar pulsations. To gain an understanding of how the star is affected by non-radial pulsations, the radial part of the oscillation is plotted, with an assumed sinusoidal time variation. The amplitude of the motion is arbitrarily set at 20% of the radius. 相似文献
805.
An analysis is made of the errors in the determination of the position of an emergency transmitter in a satellite-aided search and rescue system. The satellite is assumed to be at a height of 820 km in a near-circular near polar orbit. Short data spans of four minutes or less are used. The error sources considered are measurement noise, transmitter frequency drift, ionospheric effects, and error in the assumed height of the transmitter. The errors are calculated for several different transmitter positions, data rates, and data spans. The only transmitter frequency used was 406 MHz, but the result can be scaled to different frequencies. 相似文献
806.
G.W. Pneuman 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1982,2(11):233-236
If a magnetic structure emerges into the solar atmosphere containing a preexisting magnetic field, the preexisting field must be moved aside to allow space for the emerging flux. Under these conditions, provided the ambient field strength decreases outward with radial distance, the ambient field may tend to pinch off the emerging field through magnetic reconnection and expell it outward. Here, a model is developed to demonstrate this effect and to evaluate its relevance to the coronal transient phenomenon. In particular, we argue that, if magnetic reconnection can be initiated in such a configuration, the upward force produced by the ambient field is enhanced and, depending upon the internal conditions of the configuration, a coronal transient could be initiated in this manner. 相似文献
807.
Miles R.B. Kimball R.B. Frey W.H. 《IEEE transactions on aerospace and electronic systems》1971,(4):578-584
Outdated and rigorous curricula are not only producing engineers unsuited to the challenges of the 1970's, but they are scaring off many of the most creative and intelligent students. Engineering education has become an endurance test; the excitement has been lost. Most students strive only to get out. Engineering schools have not yet realized the importance of the involvement of engineers in current environmental problems. They continue to present only the dry technical courses and seem unconcerned about the student's sense of social perspective or his motivation. This paper proposes a freshman awareness seminar plus project oriented learning in the following years as a remedy for this sad situation. 相似文献
808.
Cantrell B.H. Gordon W.B. Trunk G.V. 《IEEE transactions on aerospace and electronic systems》1981,(2):213-221
The maximum likelihood estimates of the elevation angles of two closely spaced targets within the beamwidth is considered. For an array divided into three subapertures, a simple, closed form solution is found whose accuracy compares favorably to the maximum likelihood estimate which uses all the individual elements. Simulation results are presented for the case of a radar target located over a smooth reflecting surface. 相似文献
809.
W. M. Glencross 《Space Science Reviews》1982,33(1-2):151-160
Early models of the Chromosphere-Corona transition zone of the Sun considered it to be a static plane-parallel region. From these it became clear that the layer was extremely thin and had an important role in the conduction of energy from the Corona. More recent observations show mass motions of order 10 km s-1, which means that heating and cooling of the moving plasma has an important affect on the energy balance, while transient effects producing far higher velocities are also common. Studies of plasma motion through the zone are clearly relevant to the initial heating of material which enters the solar wind.Paper presented at the IX-th Lindau Workshop The Source Region of the Solar Wind. 相似文献
810.
W.M. Alexander J.D. Corbin 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(8):107-110
Recent studies of the lunar ejecta from lunar impacts of interplanetary dust particles indicate that during favorable lunar phases, over 80% of the submicron ejecta enters the earth's magnetosphere. This “pulse” of lunar ejecta produced by the sporadic meteor background will follow the random variations of the sporadic flux. An additional enhancement of this flux can be related to major meteor showers. Since the annual periods of these showers occur during varying lunar phase angles, magnetosphere ejecta flux associated with major showers will vary depending on the coincidence of shower periods and favorable lunar phase angles. The results of an analysis of the “pulse” of ejecta flux in the magnetosphere during the Quadrantids, Geminids, Leonids, and Perseids meteor showers are presented. These results are compared to the satellite measurements of 1959 Eta and HEOS II. 相似文献