全文获取类型
收费全文 | 20427篇 |
免费 | 699篇 |
国内免费 | 600篇 |
专业分类
航空 | 11791篇 |
航天技术 | 5678篇 |
综合类 | 656篇 |
航天 | 3601篇 |
出版年
2021年 | 294篇 |
2019年 | 224篇 |
2018年 | 313篇 |
2017年 | 216篇 |
2016年 | 259篇 |
2015年 | 218篇 |
2014年 | 594篇 |
2013年 | 660篇 |
2012年 | 584篇 |
2011年 | 793篇 |
2010年 | 681篇 |
2009年 | 1015篇 |
2008年 | 978篇 |
2007年 | 552篇 |
2006年 | 559篇 |
2005年 | 519篇 |
2004年 | 500篇 |
2003年 | 572篇 |
2002年 | 592篇 |
2001年 | 628篇 |
2000年 | 441篇 |
1999年 | 549篇 |
1998年 | 460篇 |
1997年 | 380篇 |
1996年 | 408篇 |
1995年 | 476篇 |
1994年 | 420篇 |
1993年 | 386篇 |
1992年 | 323篇 |
1991年 | 278篇 |
1990年 | 259篇 |
1989年 | 383篇 |
1988年 | 216篇 |
1987年 | 236篇 |
1986年 | 231篇 |
1985年 | 636篇 |
1984年 | 509篇 |
1983年 | 396篇 |
1982年 | 484篇 |
1981年 | 606篇 |
1980年 | 244篇 |
1979年 | 185篇 |
1978年 | 189篇 |
1976年 | 156篇 |
1975年 | 183篇 |
1974年 | 180篇 |
1973年 | 161篇 |
1972年 | 188篇 |
1971年 | 148篇 |
1969年 | 147篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
871.
本文通过对该型教练机现有航空电子系统构型、驾驶员操作程序、接口控制文件深入研究,结合未来功能扩展需求,给出了合理的系统构型分析、功能分配、数据流规划、原相关系统软件改动分析,在此基础上还设计出了嵌入式训练系统技术方案.依据方案研制的嵌入式训练系统原理样机通过系统动态试验、航电系统地面综合试验和飞机地面通电试验,证明系统... 相似文献
872.
Devajyoti Dutta Sanjay Sharma G.K. Sen B.A.M. Kannan S. Venketswarlu R.M. Gairola J. Das G. Viswanathan 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
By using a Doppler Weather Radar (DWR) at Shriharikota (13.66°N & 80.23°E), an Artificial Neural Network (ANN) based technique is proposed to improve the accuracy of rain intensity estimation. Three spectral moments of a Doppler spectra are utilized as an input data to an ANN. Rain intensity, as measured by the tipping bucket rain gauges around the DWR station, are considered as a target values for the given inputs. Rain intensity as estimated by the developed ANN model is validated by the rain gauges measurements. With the help of a developed technique, reasonable improvement in the estimation of rain intensity is observed. By using the developed technique, root mean square error and bias are reduced in the range of 34–18% and 17–3% respectively, compared to Z–R approach. 相似文献
873.
874.
V. G. Dmitriev V. I. Biryukov O. V. Egorova S. I. Zhavoronok L. N. Rabinskii 《Russian Aeronautics (Iz VUZ)》2017,60(2):169-176
The discretization of the boundary value problem for laminated composite shells is based on the finite difference approach using the regular mesh with the constant grid step and the difference operators of the second order of accuracy. The dynamic relaxation method is proposed for the solution of the nonlinear problem. The evolutionary equations of the dynamic relaxation are constructed, and the optimum parameters of the converging linear iterative process are estimated. 相似文献
875.
Y. Wu D.Y. Yang P.F. Tu Y.Z. Tian Y.H. Guo X.M. Wang X.B. Li 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
The dried, fleshy stems of Cistanche deserticola (Orobanchaceae) are popular tonics in Traditional Chinese Medicine (TCM) to treat the inability of kidney in expelling extra fluid in the body, causing fluid retention, and reform reproductive system. However, the wild plants of C. deserticola have become endangered due to habitat downsizing and over-harvesting for its medicinal usages. The present research was carried out for the following purposes: (1) promoting the space-breeding research; (2) providing molecular evidence for agricultural selective breeding; and (3) protecting this endangered herbal medicine and conserving its genetic resources. 相似文献
876.
This paper presents a brief review of activities in laminar flow control being performed at the Central Aerohydrodynamic Institute named after Prof. N.E. Zhukovsky (TsAGI). These efforts are focused on the improvement of the existing laminar flow control methods and on the development of new ones. The investigations have demonstrated the effectiveness of aircraft surface laminarization applications with the aim of friction drag reduction. The opportunity of considerable delaying of laminar-turbulent transition due to special wing profile geometry and using boundary layer suction and surface cooling has been verified at sub- and supersonic speeds through various wind tunnel testing at TsAGI and during flying laboratory experiments at the Flight Research Institute (LII). The investigations on using hybrid laminar flow control systems for friction drag reduction were also carried out. New techniques of laminar flow control were proposed, in particular, the method of local heating of the wing leading edge, boundary layer laminarization by means of receptivity control, and electrohydrodynamic methods of boundary layer stability control. 相似文献
877.
For an interception strategy of a removable target by a return space vehicle (RSV), we propose a structure of the control law by the aerodynamic efficiency that determines a chain of the three standard trajectories: nosing-up–free flight–nosing-down. A solution of the terminal problem is to determine numerical values of the control parameters that define moments to switch the RSV flight from one standard trajectory to another. 相似文献
878.
A problem of modeling the incompressible viscous flow between two disks taking into account the rotation of one of them is
considered. We study the effect of the disk angular velocity (flow regimes) in the interdisk spacing, finiteness (infiniteness)
of disk radiuses, calculation region configuration as well as distances between disks on the flow characteristics, particularly,
on the resistance moment coefficient. Numerical simulation is performed with the aid of Maple and ANSYS Fluent software. 相似文献
879.
An algorithm of analyzing the design parameters for a thin-walled wing from composite material based on the efficient distribution
of structural material between load-carrying elements is described. We consider the problems of convergence acceleration for
the iteration design analysis. Also presented are the examples of determining the design parameters for a superlight aircraft
wing and the rational parameters of the filler in the form of a three-dimensional rod structure. 相似文献
880.
We considered the influence of temperature on the nitric oxide emission under combustion of the near-stoichiometric mixtures
with and without water feed. We revealed the advantage of the method of fuel-water-air mixture combustion over that of the
leaned mixture combustion. 相似文献