全文获取类型
收费全文 | 8124篇 |
免费 | 644篇 |
国内免费 | 483篇 |
专业分类
航空 | 4414篇 |
航天技术 | 2297篇 |
综合类 | 443篇 |
航天 | 2097篇 |
出版年
2023年 | 41篇 |
2022年 | 115篇 |
2021年 | 182篇 |
2020年 | 131篇 |
2019年 | 129篇 |
2018年 | 307篇 |
2017年 | 271篇 |
2016年 | 201篇 |
2015年 | 199篇 |
2014年 | 302篇 |
2013年 | 307篇 |
2012年 | 351篇 |
2011年 | 482篇 |
2010年 | 463篇 |
2009年 | 552篇 |
2008年 | 537篇 |
2007年 | 392篇 |
2006年 | 254篇 |
2005年 | 309篇 |
2004年 | 208篇 |
2003年 | 257篇 |
2002年 | 238篇 |
2001年 | 256篇 |
2000年 | 174篇 |
1999年 | 198篇 |
1998年 | 186篇 |
1997年 | 164篇 |
1996年 | 151篇 |
1995年 | 193篇 |
1994年 | 174篇 |
1993年 | 104篇 |
1992年 | 135篇 |
1991年 | 87篇 |
1990年 | 62篇 |
1989年 | 103篇 |
1988年 | 58篇 |
1987年 | 50篇 |
1986年 | 46篇 |
1985年 | 108篇 |
1984年 | 92篇 |
1983年 | 77篇 |
1982年 | 94篇 |
1981年 | 129篇 |
1980年 | 42篇 |
1979年 | 38篇 |
1978年 | 34篇 |
1977年 | 26篇 |
1976年 | 30篇 |
1974年 | 25篇 |
1973年 | 24篇 |
排序方式: 共有9251条查询结果,搜索用时 31 毫秒
101.
较详细地对复合材料壳体与喷管卡环连接结构进行了有限元应力,应变分析,对卡环,接头及倒锥等多体接触问题进行研究;对“I”型及“L”型卡环结构分别进行了计算和比较,并给出计算结果及结果分析。 相似文献
102.
Extra-vehicular activity (EVA) has a significant role during extended space flights. It demonstrates that humans can survive and perform useful work outside the Orbital Space Stations (OSS) while wearing protective space suits (SS). When the International Space Station 'Alpha' (ISSA) is fully operational, EVA assembly, installation, maintenance and repair operations will become an everyday repetitive work activity in space. It needs new ergonomic evaluation of the work/rest schedule for an increasing of the labor amount per EVA hour. The metabolism assessment is a helpful method to control the productivity of the EVA astronaut and to optimize the work/rest regime. Three following methods were used in Russia to estimate real-time metabolic rates during EVA: 1. Oxygen consumption, computed from the pressure drop in a high pressure bottle per unit time (with actual thermodynamic oxygen properties under high pressure and oxygen leakage taken into account). 2. Carbon dioxide production, computed from CO2 concentration at the contaminant control cartridge and gas flow rate in the life support subsystem closed loop (nominal mode) or gas leakage in the SS open loop (emergency mode). 3. Heat removal, computed from the difference between the temperatures of coolant water or gas and its flow rate in a unit of time (with assumed humidity and wet oxygen state taken into account). Comparison of heat removal values with metabolic rates enables us to determine the thermal balance during an operative medical control of EVA at "Salyut-6", "Salyut-7" and "Mir" OSS. Complex analysis of metabolism, body temperature and heat rate supports a differential diagnosis between emotional and thermal components of stress during EVA. It gives a prognosis of human homeostasis during EVA. Available information has been acquired into an EVA data base which is an effective tool for ergonomical optimization. 相似文献
103.
Shostak GS 《Acta Astronautica》1997,41(4-10):623-627
Consideration of the reaction to a SETI detection by the media, and the effect this will have on the public, is more than mere sociological speculation. An accurate forecast of the media's interest can lead to actions that will help ensure that correct and comprehensible information reaches the public. This is most critical in the first few weeks following a discovery. While a widely accepted protocol for dealing with a detection exists in the "Declaration of Principles Following the Detection of Extraterrestrial Intelligence," it gives scant consideration to the fact that the actual situation will be chaotic and not subject to easy control. The 1996 story about the possible discovery of martian microfossils has provided a useful precedent for what will happen if astronomers uncover the existence of alien intelligence. 相似文献
104.
In 1994-1995 Lavochkin Association (Russia) together with the other enterprises in accordance with technical requirements of the Russian Space agency, developed a new Russian communication satellite of a small class that will operate in both the geostationary (GSO) and high-elliptical (HEO) orbits. This satellite may be injected into operational orbits using a SOYUZ-2 launch vehicle (LV) and a FREGAT upper stage (US) from Plesetsk and Baykonur space launch sites (SLS).The main reason for creating such a satellite was to decrease the cost of the support and development of the Russian communication geostationary satellites group.Russian satellites Horizont, Express, Ekran and Gals, which operate in GSO, are the basis of the space segment for communications, radio and TV broadcasting. All of these satellites are injected into GSO by the PROTON LV. PROTON is a launch vehicle of a heavy class. The use of a middle class LV instead of a heavy class will allow to reduce considerably the launch cost. The change of a heavy class LV to a LV of middle class determined one economic reason for this project. Besides, the opportunity to launch S/C into GSO from Russian Plesetsk SLS increases the independence of Russia in the domain of space communications, despite the presence of the contract with Kazachstan about the rent of Baykonur SLS. Finally, use of small satellites with a rather small number of transponders is more effective than the use of big satellites. It will allow also to increase a satellite group (by the launch of additional satellites) precisely in accordance to the development of the ground segment. 相似文献
105.
Phillip S. Clark 《Space Policy》1991,7(3)
In the last two years the USSR has not only acknowledged publicly for the first time that it was trying to ‘race’ the USA to put the first man on the Moon, but they have finally given some details of the programme, the equipment and the political in-fighting which ensured that the programme was a failure. This article traces the history of the Soviet manned lunar programme and also discusses the implications for the future development of the Soviet manned programme of the giant N-1 booster's cancellation in 1974. 相似文献
106.
107.
A model of low velocity detonations in charges of cast and pressed high explosives confined in metal tubes with thin walls is suggested. An analytical solution is obtained and velocities and pressures of stationary LVD waves are calculated as functions of the parameters of the wall confinement. The fraction of the total chemical energy transferred to maintain the shock wave and the average rate of reaction in the wave are estimated and the dynamics of transient predetonation processes are analysed. An explanation of the causes of the secondary shock wave formation in the transition from deflagration to normal detonations is suggested and the delay of this secondary wave is calculated and compared with experimental data. 相似文献
108.
智能天线结构模糊自适应变形控制实验研究 总被引:2,自引:1,他引:2
基于dSPACE半物理仿真系统和所研制的压电作动器,设计并构建了智能天线结构实验平台,进行了结构变形控制实验研究。实验中采用常规PID作为基本控制方法,并在此基础上设计了一种模糊自适应PID控制器,将两种方法对应的不同控制效果进行了对比。结果表明:在所给的实验条件下,基于压电材料可实现对智能天线结构变形的控制,作动器控制变形量最大可达166μm;两种控制方法均可对结构变形进行控制,模糊自适应方法的绝对位置控制精度达到±0.5μm;应用模糊自适应PID控制方法对结构进行变形控制,较之常规PID控制方法能够降低系统响应的超调量,缩短稳定时间,提高控制精度,得到更好的控制过程。 相似文献
109.
110.
The transport characteristics of macroparticles, charged by the solar radiation under microgravity conditions, were investigated by analyzing the videorecords of experiments carried out onboard the Mirorbital station. The temperature, distributions of velocities, charge, friction coefficient, and diffusion coefficient were obtained for bronze particles. 相似文献