全文获取类型
收费全文 | 4767篇 |
免费 | 11篇 |
国内免费 | 11篇 |
专业分类
航空 | 1928篇 |
航天技术 | 1497篇 |
综合类 | 20篇 |
航天 | 1344篇 |
出版年
2022年 | 16篇 |
2021年 | 49篇 |
2019年 | 21篇 |
2018年 | 213篇 |
2017年 | 167篇 |
2016年 | 139篇 |
2015年 | 53篇 |
2014年 | 145篇 |
2013年 | 165篇 |
2012年 | 155篇 |
2011年 | 257篇 |
2010年 | 215篇 |
2009年 | 298篇 |
2008年 | 306篇 |
2007年 | 217篇 |
2006年 | 100篇 |
2005年 | 144篇 |
2004年 | 137篇 |
2003年 | 148篇 |
2002年 | 109篇 |
2001年 | 165篇 |
2000年 | 62篇 |
1999年 | 79篇 |
1998年 | 84篇 |
1997年 | 63篇 |
1996年 | 77篇 |
1995年 | 104篇 |
1994年 | 85篇 |
1993年 | 52篇 |
1992年 | 70篇 |
1991年 | 18篇 |
1990年 | 30篇 |
1989年 | 66篇 |
1988年 | 21篇 |
1987年 | 31篇 |
1986年 | 32篇 |
1985年 | 118篇 |
1984年 | 78篇 |
1983年 | 66篇 |
1982年 | 64篇 |
1981年 | 119篇 |
1980年 | 33篇 |
1979年 | 21篇 |
1978年 | 19篇 |
1977年 | 25篇 |
1976年 | 20篇 |
1975年 | 24篇 |
1974年 | 23篇 |
1972年 | 15篇 |
1971年 | 14篇 |
排序方式: 共有4789条查询结果,搜索用时 15 毫秒
341.
342.
A. N. Sabirzyanov A. I. Glazunov A. N. Kirillova K. S. Titov 《Russian Aeronautics (Iz VUZ)》2018,61(2):257-264
Multiparameter studies of the discharge coefficient dependence on the nozzle geometry and the presence of a condensed phase in combustion products were performed. The simulation results obtained satisfactorily agree with the well-known generalized data. The modern computational fluid dynamics methods were shown to be able to refine the generalized empirical relations. 相似文献
343.
K. S. Kuz’mina I. K. Marchevskii V. S. Moreva E. P. Ryatina 《Russian Aeronautics (Iz VUZ)》2017,60(3):398-405
A high-accuracy numerical scheme is proposed for vortex methods of flow simulation around airfoils of arbitrary shape including airfoils with sharp edges, because it does not require the solution continuity on the airfoil. 相似文献
344.
This paper considers issues of designing a gas-turbine engine in the helicopter system at the early design stages. The optimum and rational values of engine working process parameters at different flight speeds of the flight vehicle (FV) are analyzed. Several characteristics of mathematical models (MM) that form the helicopter–engine system, are described. 相似文献
345.
This paper deals with the technical features of designing an information-controlling system to prevent critical operating conditions of the helicopter flight, a technique for evaluating its effectiveness, analysis and synthesis of the measurement channels, forming of warning signals, and information support of the crew in abnormal situations. 相似文献
346.
Yu. A. Gravchenko B. K. Grankin V. V. Kozlov S. V. Chirva 《Russian Aeronautics (Iz VUZ)》2017,60(3):327-334
The paper adduces the relators for algebraic operations on graphs using the numeric codes of the graphs. The special algebra of codes has been devised with consideration of the principles of graph transformation. This paper demonstrates the relevance of numeric coding of graphs for solving the problems of enumeration, systematization, and compact representation of the information about the structural and functional characteristics of the systems of flow distribution and conversion of rocket and space technology and for conducting the modeling transformations of given systems in the course of the structural and functional studies as well. 相似文献
347.
The paper discusses a method of designing the neural controller for two-channel control of a technical object by an example of the roll and yaw control depending on deviations, velocities and accelerations of their variation. 相似文献
348.
The methodology is proposed and the mathematical model is developed for the purpose of numerical simulation of the power circuit of the gas-hydraulic actuator with displacing power source for the gimbaled nozzle control. It provides the highest power efficiency factor of the actuator as a part of aircraft by means of pulling together the profiles of available and required power. 相似文献
349.
In the paper, processes of high-energy electron beam interaction with plasma particles in a discharge channel of a stationary plasma thruster are analyzed and the results are presented. 相似文献
350.
The paper highlights significance of the interturbine transition duct as part of the high pressure and low pressure turbine spool. The correlations have been suggested allowing us to estimate variation of the average cross section flow swirl while its passing the interturbine transition duct. 相似文献