全文获取类型
收费全文 | 153篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
航空 | 57篇 |
航天技术 | 63篇 |
航天 | 34篇 |
出版年
2021年 | 7篇 |
2019年 | 6篇 |
2018年 | 11篇 |
2017年 | 4篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2012年 | 8篇 |
2011年 | 15篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 7篇 |
2006年 | 2篇 |
2005年 | 9篇 |
2004年 | 5篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 9篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 13篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 359 毫秒
151.
Y Honda R Navarro-González C Ponnamperuma 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1989,9(6):63-66
A CH4-N2-H2OV gas mixture was subjected to a high voltage (20 kV), high frequency (0.3 MHz) electric discharge. The energy input in the electric discharge was varied from 0.016 to 3.048 MJ mol-1. The chemical yields (G), expressed as the number of molecules formed or destroyed per 100 eV of energy input were calculated for several products. The G values calculated at the lowest energy input were (-CH4) = 6.48; (-N2) = 2.51; (C2H2) = 1.16; (HCN) = 0.215; (CH3CHO) = 0.115; (CH3CH2CHO) = 0.00161; (CH3(CH2)2CHO) = 0.0165; ((CH2CO2H)2) = 0.0000339; (CH4 --> Solid material) = 0.196; (N2 --> Solid material) = 0.00355. This is the first report in prebiotic studies in which the G values of various products in electric discharge experiments are determined. This type of study is needed in order to get a better insight into the relative role of electric discharges on the primitive Earth. 相似文献
152.
P. Lála 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(6):57-67
The computer program used mainly for determination of orbits of the Interkosmos satellites is described. Examples of results are given for Geos B and Interkosmos 17 satellites. 相似文献
153.
M.M. Császár 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(4):309-312
Two procedure are presented for quantitative estimation of cloud cover (N), type of clouds (C), as well as base of clouds (Cb) and top of clouds (Ct) by using radiosonde data as well as satellite cloud pictures and radiation data. The data obtained in this way can be used as input data in the model for the estimation of the vertical profile of longwave radiative cooling. 相似文献
154.
Román Alvarez 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1983,3(7):113-117
Remote sensing is a data gathering and analysis technique that offers the possibility of natural resource evaluation. Countries that have not yet evaluated their main resources owing to the lack of basic knoweldge of their territory, are attracted by the idea of rapidly creating data banks through the use of remote sensing. While such a technique offers advantages over traditional means of data acquisition, it requires special systems and methods of analysis that are not particularly easy to assimilate. The building of data bases is taken here as the framework for analyzing some problems confronted by developing countries when trying to incorporate the techniques of teledetection. 相似文献