全文获取类型
收费全文 | 405篇 |
免费 | 104篇 |
国内免费 | 84篇 |
专业分类
航空 | 280篇 |
航天技术 | 104篇 |
综合类 | 64篇 |
航天 | 145篇 |
出版年
2024年 | 3篇 |
2023年 | 8篇 |
2022年 | 12篇 |
2021年 | 17篇 |
2020年 | 27篇 |
2019年 | 13篇 |
2018年 | 24篇 |
2017年 | 19篇 |
2016年 | 18篇 |
2015年 | 19篇 |
2014年 | 32篇 |
2013年 | 30篇 |
2012年 | 41篇 |
2011年 | 25篇 |
2010年 | 25篇 |
2009年 | 30篇 |
2008年 | 23篇 |
2007年 | 16篇 |
2006年 | 23篇 |
2005年 | 21篇 |
2004年 | 11篇 |
2003年 | 15篇 |
2002年 | 32篇 |
2001年 | 8篇 |
2000年 | 7篇 |
1999年 | 15篇 |
1998年 | 13篇 |
1997年 | 6篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 10篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
排序方式: 共有593条查询结果,搜索用时 15 毫秒
121.
The high flux of energetic electron on geostationary orbit can induce many kinds of malfunction of the satellite there, within which the bulk-charging is the most significant that several broadcast satellite failures were confirmed to be due to this effect. The electron flux on geostationary orbit varies in a large range even up to three orders accompanied the passage of interplanetary magnetic cloud and the following geomagnetic disturbances. Upon the investigation of electron flux enhancement events, two types of events were partitioned as recurrent events and random ones. Both of the two kinds of events relate to the interplanetary conditions such as solar wind parameters, IMF etc and their evolution characters as well. As for the recurrent events, we found that, (1) all of the events exhibits periodic recurrence about 27 days, (2) significant increase of electron flux relates to interplanetary index and characters of their distribution, (3) the electron flux also has relation to solar activity index. An artificial neural network was constructed to estimate the flux I day ahead. The random electron flux enhancement events are rare and present different distribution figures to the recurrent ones. The figure of the random events and the conditions of their occurrence is also discussed in this paper. 相似文献
122.
123.
124.
125.
基于传声器阵列的声源定位算法的性能优劣决定了气动噪声试验检测中气动噪声源定位成像的准确性。为了提高相关声源定位方法的稳健性和准确性,提出一种改进的声反卷积相关声源定位方法——D-MACS(Developed-Mapping of Acoustic Correlated Sources)方法。该方法的特点是:在传统MACS方法的基础上,将声反卷积模型进行改进,使模型体现出声场空间扫描点声压互谱矩阵与互谱波束形成输出矩阵之间的数学关系,其最终获得的声源定位结果,能够提高MACS方法声源定位辨识的稳健性和准确性。通过仿真信号研究和声学风洞环境中的声源定位试验研究,比较了DAS(Delay And Sum beamformming)、DAMAS-C(Deconvolution Approach for the Mapping of Acoustic Correlated Sources)、MACS和D-MACS这4种方法的声源定位性能,验证了D-MACS方法在声源定位性能上的优势。 相似文献
126.
127.
Bowen Hou Jiongqi Wang Haiyin Zhou Zhangming He Dong Li Xue Liu 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2021,67(3):1090-1113
Guidepost-based navigation system is a novel autonomous orbit determination method for the GEO satellite. The system is achieved by using the camera imaging function to obtain the guidepost images and the GNSS signal receiver to obtain the pseudoranges between the GEO and the navigation satellites. Due to the high altitude of GEO satellite and the time-varying sunlight condition in the space environment, it may be difficult to obtain object image points and the distance measurements of GNSS because of the weak visibility of the guideposts. To deal with the problem, a novel integrated orbit determination system is presented. The Earth landmarks, the in-orbit spacecraft and GNSS navigation satellites whose line-of-sights and the distance can be easily obtained are used at the same time as information for the GEO satellite navigation based on the observability conditions analysis. The observability of the GEO satellite navigation system is analyzed through the physical observability, the mathematical observability and the engineering observability through the observing geometry, the rank of observability matrix and the Cramer-Rao lower bound (CRLB) respectively. Besides, the maximum correntropy unscented Kalman filter (MCUKF) algorithm is applied to improve the estimation stability of the system in the presence of non-Gaussian noises. The simulation indicates the feasibility of the proposed scheme. 相似文献
128.
本文探讨了几种典型金属物体的低频散射问题。介绍了低频散射截面的计算方法;对计算结果进行了分析;并就雷达目标低频散射特性提出了作者的观点。 相似文献
129.
在工程设计中,有些内容往往是工程设计人员根据一些不完整的历史资料萌发创作意念并概略地草构出透视表现图,虽然,在绘制标准的透视图时,这些资料所提供的参数是不够的,本文通过对物体三个主方向及其透视图中几何关系和矢量关系的分析,利用透视投影本方程由一已知物体的部分透视,确定其进行透视投影的全部参数,为透视变换和利用计算机绘制透视图提供了有效的基础条件。 相似文献
130.
通过理论分析和实验研究,以流动原水为研究对象,首次考察了PAM、PAC、PAF和PFS几种絮凝剂在絮凝过程中的透光脉动值变化。结果表明,不同种类絮凝剂投加条件下所形成的絮凝体具有不同的特性,能及时得到絮凝体破碎和重组的有关信息。 相似文献