全文获取类型
收费全文 | 700篇 |
免费 | 134篇 |
国内免费 | 92篇 |
专业分类
航空 | 419篇 |
航天技术 | 211篇 |
综合类 | 109篇 |
航天 | 187篇 |
出版年
2024年 | 4篇 |
2023年 | 12篇 |
2022年 | 20篇 |
2021年 | 22篇 |
2020年 | 34篇 |
2019年 | 43篇 |
2018年 | 38篇 |
2017年 | 41篇 |
2016年 | 40篇 |
2015年 | 29篇 |
2014年 | 44篇 |
2013年 | 29篇 |
2012年 | 36篇 |
2011年 | 50篇 |
2010年 | 29篇 |
2009年 | 45篇 |
2008年 | 33篇 |
2007年 | 41篇 |
2006年 | 47篇 |
2005年 | 41篇 |
2004年 | 28篇 |
2003年 | 30篇 |
2002年 | 19篇 |
2001年 | 20篇 |
2000年 | 17篇 |
1999年 | 15篇 |
1998年 | 18篇 |
1997年 | 15篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 13篇 |
1993年 | 15篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 8篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 1篇 |
排序方式: 共有926条查询结果,搜索用时 437 毫秒
391.
392.
393.
简要介绍了箭上电气系统电缆网热防护技术应用现状,阐述了一体化热防护研究的必要性,提出了轻质电缆网的芯线、绝缘层、屏蔽层、插头和热防护层有效集成的总体方案。研制热防护材料,确定热防护层结构,试制一体化热防护电缆网,模拟热环境试验,研究表明:一体化热防护电缆网满足结构减重与轻柔、可靠性提高和总装周期缩短等总体指标要求。 相似文献
394.
395.
Bernardo Vargas Cárdenas José F. Valdés-Galicia 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2012
We performed a search for ground level solar cosmic ray enhancements on the full five minute database of the Mexico City neutron monitor using wavelet filters and two different statistical tests. We present a detailed analysis of the time series of November 2, 1992, where we found a previously unreported increment matching the onset time of the impulsive phase of GLE 54, thus providing evidence of an effective detection of high energy solar cosmic rays. 相似文献
396.
Prospects of using a permanent magnetic end effector to despin and detumble an uncooperative target 总被引:1,自引:0,他引:1
Xiaoguang Liu Yong Lu Yu Zhou Yuanhao Yin 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2018,61(8):2147-2158
Space debris, such as defunct satellites and upper stages of rockets, becomes an uncooperative target after losing its attitude control and communication ability. In addition, tumbling motion can occur due to environmental perturbations and residual angular momentum prior to the object’s end-of-mission. To minimize the collision risk during docking and capturing of the tumbling target, a non-contact method based on the eddy current effect is put forward to transmit the control torque to the tumbling target. The main idea is to induce a controllable torque on the conducting surface of the tumbling target using a rotational magnetic field generated by a Halbach rotor. The radial and axial Halbach rotors are used to damp the spinning and nutation motions of the target, respectively. The normal and tangential force are evaluated concerning the relative pose between the chaser and the target. A simplified dynamic model of the nutation damping and despinning processes is developed and the influences of the asymmetrical principal moments of inertia and transverse angular velocity are discussed. The numerical simulation results show that the designed Halbach rotor stabilized the target attitude within an acceptable time. The electromagnetic nutation damping and despinning method provides new solutions for the development of on-orbit capture technology. 相似文献
397.
I.B. Ievenko S.G. ParnikovV.N. Alexeyev 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(8):1252-1260
Investigation results of a diffuse aurora (DA) and stable auroral red (SAR) arc dynamics based on spectrophotometric observations at the Yakutsk meridian (199°E geomagnetic longitude) are presented. The relationship of an equatorward extension of DA in the 557.7 nm emission to a substorm growth phase during the magnetospheric convection intensification after the turn of IMF BZ to the south is shown. The formation of SAR arc during the substorm expansion phase is investigated. The association of SAR arc dynamics with the development of asymmetric ring current (substorm injection) during the main phase of a storm is analyzed. It is shown how the pulsating precipitations of energetic ring current particles develop in the outer plasmasphere based on photometric observations. 相似文献
398.
399.
闫晓金 《华北航天工业学院学报》2013,(6):23-26
在分析了大功率LED混光照明中LED光源特性的基础上,提出了三色LED恒流驱动电路的设计方案。驱动电路分别采用升压和降压拓扑结构,利用具有PWM实时调光功能的RT8452作为驱动控制芯片,通过改变外接PWM占空比即可调节LED亮度。实验证明,此驱动电路工作可靠,效率高,实现简单。 相似文献
400.
Colby L. Lemon T. Paul O’Brien 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(8):1226-1233
We describe a tabular specification model of the density and temperature of ions and electrons at geosynchronous orbit as a function of magnetic local time and solar wind parameters. This model can be used to provide boundary conditions for numerical ring current models. Unlike previous specification models of geosynchronous plasma moments, this model is parameterized by upstream solar wind conditions. We find that solar wind parameters are a better predictor of geosynchronous ion density than magnetospheric indices, and as upstream parameters they are often more appropriate as model inputs since they causally precede the model outputs. Of the upstream parameters that were tested, the best predictors of geosynchronous conditions were the solar wind flow pressure and the magnitude and Z-component of the interplanetary magnetic field. 相似文献