全文获取类型
收费全文 | 717篇 |
免费 | 817篇 |
国内免费 | 84篇 |
专业分类
航空 | 1182篇 |
航天技术 | 221篇 |
综合类 | 23篇 |
航天 | 192篇 |
出版年
2024年 | 3篇 |
2023年 | 10篇 |
2022年 | 72篇 |
2021年 | 88篇 |
2020年 | 66篇 |
2019年 | 43篇 |
2018年 | 30篇 |
2017年 | 26篇 |
2016年 | 26篇 |
2015年 | 26篇 |
2014年 | 50篇 |
2013年 | 67篇 |
2012年 | 66篇 |
2011年 | 56篇 |
2010年 | 57篇 |
2009年 | 58篇 |
2008年 | 73篇 |
2007年 | 61篇 |
2006年 | 51篇 |
2005年 | 64篇 |
2004年 | 56篇 |
2003年 | 73篇 |
2002年 | 66篇 |
2001年 | 41篇 |
2000年 | 47篇 |
1999年 | 62篇 |
1998年 | 62篇 |
1997年 | 51篇 |
1996年 | 43篇 |
1995年 | 45篇 |
1994年 | 28篇 |
1993年 | 11篇 |
1992年 | 13篇 |
1991年 | 11篇 |
1990年 | 6篇 |
1989年 | 1篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1984年 | 1篇 |
排序方式: 共有1618条查询结果,搜索用时 500 毫秒
1.
The Cluster mission of the European Space Agency (ESA) will allow, for the first time three-dimensional measurements in key regions of the Earth's magnetosphere to be carried out. The European Numerical Simulation Network (ENSN) aims at providing a theoretical support to the mission. We describe the achievements of the ENSN during its first period of activity 1991–1994, during which the network was funded by the European Union. In particular, the ENSN has set up (i) thematic Working Groups on the prime scientific goals of the mission, (ii) a code development Working Group to develop numerical simulation codes specifically adapted to studying magnetospheric boundaries and the corresponding scale mixing, and (iii) software models of Cluster instruments to test in a numerical simulation what the set of four instruments will measure. 相似文献
2.
3.
Large amplitude MHD waves are commonly found in the solar wind. Nonlinear interactions between the MHD waves are likely to
produce finite correlation among the wave phases. For discussions of various transport processes of energetic particles, it
is fundamentally important to determine whether the wave phases are randomly distributed (as assumed in quasi-linear theories)
or they have a finite coherence. Using a method based on a surrogate data technique and a fractal analysis, we analyzed Geotail
magnetic field data (provided by S. Kokubun and T. Nagai through DARTS at the Institute of Space and Astronautical Science)
to evaluate the phase coherence among the MHD waves in the earth's foreshock region. The correlation of wave phases does exist,
indicating that the nonlinear interactions between the waves is in progress.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
4.
5.
H. Lundstedt 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2005,36(12):2516-2523
The methods of today’s predictions of space weather and effects are so much more advanced and yesterday’s statistical methods are now replaced by integrated knowledge-based neuro-computing models and MHD methods. Within the ESA Space Weather Programme Study a real-time forecast service has been developed for space weather and effects. This prototype is now being implemented for specific users. Today’s applications are not only so many more but also so much more advanced and user-oriented. A scientist needs real-time predictions of a global index as input for an MHD model calculating the radiation dose for EVAs. A power company system operator needs a prediction of the local value of a geomagnetically induced current. A science tourist needs to know whether or not aurora will occur. Soon we might even be able to predict the tropospheric climate changes and weather caused by the space weather. 相似文献
6.
7.
8.
对固体火箭发动机内流场的研究作了总结性的回顾,并对近年业该研究领域的若干新动向作了介绍,即粒子沉积研究、基于非结构网格技术的内流场数值模拟、复杂内流场模拟试验、 相似文献
9.
10.
轴对称降落伞稳定下降阶段的流场特性 总被引:2,自引:0,他引:2
文章根据降落伞的特点,通过3点假设(伞衣的薄膜假设、降落伞的轴对称假设和流场的定常 假设),将三维复杂流动问题,转化成二维轴对称问题,以节约计算时间。然后,建立轴对称降落伞的流体力 学计算模型,利用数值模拟手段,求解RNG(Renormalization Group)k-epsilon湍流模型下的N—S方程组,获 得与有关单位试验相吻合的计算结果。分析发现带顶孔的轴对称降落伞绕流和亚临界状态下带中心孔的 圆球绕流,在尾流区拓扑结构上几乎完全一致。结果表明建立的轴对称降落伞模型,能够揭示降落伞流场 的本质特性,为进一步研究降落伞流场的流动机理和流固耦合问题打下基础。 相似文献