全文获取类型
收费全文 | 734篇 |
免费 | 0篇 |
国内免费 | 99篇 |
专业分类
航空 | 191篇 |
航天技术 | 113篇 |
综合类 | 232篇 |
航天 | 297篇 |
出版年
2015年 | 3篇 |
2013年 | 43篇 |
2012年 | 64篇 |
2011年 | 79篇 |
2010年 | 7篇 |
2009年 | 31篇 |
2008年 | 16篇 |
2007年 | 5篇 |
2006年 | 3篇 |
2005年 | 7篇 |
2004年 | 87篇 |
2003年 | 80篇 |
2002年 | 119篇 |
2001年 | 132篇 |
2000年 | 61篇 |
1999年 | 2篇 |
1998年 | 16篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1993年 | 3篇 |
1992年 | 8篇 |
1991年 | 18篇 |
1990年 | 6篇 |
1989年 | 31篇 |
1988年 | 1篇 |
排序方式: 共有833条查询结果,搜索用时 93 毫秒
811.
812.
China Meteorological Administration 《中国航天(英文版)》2011,(2):2-5
China is one of the countries that are most frequently hit by natural disasters. Meteorological disasters contribute to 70% of all 相似文献
813.
LIU Huaiyu 《中国航天(英文版)》2015,(2):49
The development of the Chinese-French Oceanography Satellite Program is proceeding well,according to China Spacesat Co.,Ltd under China Aerospace Science and Technology Corporation who is in charge of the development of the satellite.The interface validation of the prototype phase has been completed and the satellite is expected to enter into flight model phase next year. 相似文献
814.
固化降温过程中推进剂药柱的瞬态响应分析 总被引:11,自引:3,他引:8
应用有限元法,对固体火箭发动机药柱在固化降温过程中的三维瞬态温度场进行了数值模拟,并基于药柱的粘弹性本构关系,计算了由瞬态温度场引起的应力应变响应。给出了危险点的应力应变随时间的变化规律,可供结构整体分析参考。 相似文献
815.
816.
817.
固体火箭羽焰的辐射特性及其温度测量技术述评 总被引:9,自引:1,他引:8
叙述了固体火箭羽焰的辐射特性,简要地介绍了热电偶法、等离子体法、光纤测温法、谱线反转法、发射吸收法、喇曼光谱法、微波衰减法、红外测温法和多光谱测温法的原理和应用。评述了这些火焰测温方法在羽焰测温上的适应性,并指出多光谱测温技术是羽焰测温的发展趋势之一。 相似文献
818.
819.
RBFs-MSA Hybrid Method for Mesh Deformation 总被引:3,自引:2,他引:1
LIU Yu a GUO Zheng a LIU Jun b a College of Aerospace Material Engineering National University of Defense Technology Changsha China b 《中国航空学报》2012,25(4):500-507
Simulating unsteady flow phenomena involving moving boundaries is a challenging task,one key requirement of which is a reliable and fast algorithm to deform the computational mesh.Radial basis functions(RBFs) interpolation is a very simple and robust method to deform the mesh.However,the number of operations and the requirement of memory storage will be increased rapidly as the number of grid nodes increases,which limits the application of RBFs to three-dimensional(3D) moving mesh.Moving submesh approach(MSA) is an efficient method,but its robustness depends on the method used to deform the background mesh.A hybrid method which combines the benefits of MSA and RBFs interpolation,which is called RBFs-MSA,has been presented.This hybrid method is proved to be robust and efficient via several numerical examples.From the aspect of the quality of deforming meshes,this hybrid method is comparable with the RBFs interpolation;from the aspect of computing efficiency,one test case shows that RBFs-MSA is about two orders of magnitude faster than RBFs interpolation.For these benefits of RBFs-MSA,the new method is suitable for unsteady flow simulation which refers to boundaries movement. 相似文献
820.
WANG Dengpana ZHAO Yuxina XIA Zhixuna WANG Qinghuab HUANG Xua a Science Technology on Scramjet Laboratory National University of Defense Technology Changsha China b 《中国航空学报》2012,(2):173-181
The density field around a vortex generator (VG) in supersonic flow is studied with a nanoparticle-based planar laser scattering (NPLS) method. Based on the calibration, i.e., the density distribution of the supersonic flow around a wedge, the density field of a supersonic VG is measured. According to movement characteristics of coherent structure in VG’s flow fields and the basic concepts of wavelet, the density fluctuating signals and multi-resolution characteristics of density field images are studied. The multi-resolution characteristics of density fluctuation can be analyzed with wavelet transformation of NPLS images. The wavelet approximate coefficients of density fluctuating signals exhibit their characteristics at different scales, and the corresponding detail coefficients show the difference of diverse layer smooth approximation in some way. Based on 2D wavelet decomposition and reconstruction of density field images, the approximate and detail signals at different scales are studied, and the coherent structures at different scales are extracted and analyzed. 相似文献