全文获取类型
收费全文 | 1712篇 |
免费 | 455篇 |
国内免费 | 275篇 |
专业分类
航空 | 1289篇 |
航天技术 | 328篇 |
综合类 | 171篇 |
航天 | 654篇 |
出版年
2024年 | 10篇 |
2023年 | 21篇 |
2022年 | 70篇 |
2021年 | 98篇 |
2020年 | 104篇 |
2019年 | 78篇 |
2018年 | 96篇 |
2017年 | 85篇 |
2016年 | 81篇 |
2015年 | 88篇 |
2014年 | 99篇 |
2013年 | 120篇 |
2012年 | 118篇 |
2011年 | 126篇 |
2010年 | 105篇 |
2009年 | 119篇 |
2008年 | 99篇 |
2007年 | 123篇 |
2006年 | 113篇 |
2005年 | 108篇 |
2004年 | 87篇 |
2003年 | 96篇 |
2002年 | 116篇 |
2001年 | 88篇 |
2000年 | 44篇 |
1999年 | 46篇 |
1998年 | 19篇 |
1997年 | 16篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 8篇 |
1992年 | 2篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 1篇 |
1982年 | 2篇 |
1900年 | 1篇 |
排序方式: 共有2442条查询结果,搜索用时 31 毫秒
991.
992.
压缩机的设计与制造性能尚不能充分适应风洞的运行范围 ,安全、可靠的防喘振措施是保证风洞安全运行的重要条件之一。作者讨论了旁路调节作为风洞中防喘振措施的可行性。在考虑跨声速风洞中气体压缩性的基础上 ,给出了风洞中旁路调节的估算方法 ,分析和讨论了旁路对风洞性能的影响。结果表明 :旁路的增加 ,使风洞工作点向大流量、低压缩比方向移动 ,达到有效、可靠防喘振的目的 相似文献
993.
994.
995.
996.
分析了通过窄缝隙耦俣的矩形波导H面T形接头对(以下简称HT对)的电气特性,利用等效原理和切向场连续性建立积分方程组,采用矩量法化积分方程为代数方程进行数值求解,获得散射场和等效散射参数,以X波段标准矩形波导HT接头对为例进行具体求解和计算,以及实验验证,得到良好结果。 相似文献
997.
998.
Gang Hai Huan Xie Wenjia Du Menglian Xia Xiaohua Tong Rongxing Li 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2021,67(7):2120-2139
Slope correction is important to improve the accuracy of satellite radar elevation measurements by mitigating the slope-induced error (SE), especially over uneven ground surfaces. Although several slope correction methods have been proposed, guidance in the form of stepwise algorithm on how to implement these methods in processing radar altimetric data at the coding level, and the differences among these methods need to be presented and discussed systematically. In this paper, three existing types of slope correction methods—the direct method (DM), intermediate method (IM), and relocation method (RM, further divided into RM1 and RM2)—are described in detail. In addition, their main differences and features for various scientific applications are analyzed. We conduct a systematic experiment with CryoSat-2 Low Resolution Mode (LRM) data in a physically stable area around Dome Argus in East Antarctica, where in-situ measurements were available for comparison. The slope correction is implemented separately using the three methods, with the latest high-accuracy Reference Elevation Model of Antarctica (REMA) as the a-priori topography model. The bias and precision of the slope-corrected CryoSat-2 data results from the RM2 is ?0.18 ± 0.86 m based on the comparison with the field Global Navigation Satellite System (GNSS) data. The results from the RM2 indicate higher precision compared to those from the RM1. According to the correlation analysis of the slope-corrected CryoSat-2 data results (RM1 and RM2), the bias enlarges and the precision becomes worse when the surface slope increases from 0 to 0.85°. After a comprehensively comparative analysis, we find that the results from the RM1 and RM2 are superior in precision (0.93 m and 0.86 m) with respect to the GNSS data. The relatively low precision (1.22 m) from the IM is due to the potential error from the a-priori digital elevation model (DEM). The DM has the lowest precision (2.66 m). Another experiment over rough topography in West Antarctica is carried out for comparison, especially between the RM1 (precision of 15.27 m) and RM2 (precision of 16.25 m). In general, the RM is recommended for the SE elimination among the three methods. Moreover, the RM2 is firstly considered over smooth topography due to the superior performance in bias and precision, while the RM1 is more suggested over the rough topography because of the slightly smaller bias and better precision. The IM relies much on the accuracy of the a-prior DEM and is not usually recommended, because of the strict requirement in the sampling time between the radar altimetry data and the a-priori DEM to avoid any surface change over time. 相似文献
999.
以ST89C51为核心的单片机学习板,用串行的接口芯片7289进行键盘显示器的控制,极大的节省了单片机的I/O口线,使得该系统板可以添加更多的硬件资源。简单实用的USB下载,为学生课外学习、课程设计、电子竞赛练习提供了方便。 相似文献
1000.
计算机辅助创新技木助推中国航空工业快速发展——CAI在中国航空工业领域的应用 总被引:1,自引:0,他引:1
计算机辅助创新(CAI)凭借其先进的创新理论方法和高效的创新设计平台,整合先进的仿真、管理等技术,将成为我国航空工业走向自主创新的有效途径. 相似文献