全文获取类型
收费全文 | 8003篇 |
免费 | 15篇 |
国内免费 | 23篇 |
专业分类
航空 | 3789篇 |
航天技术 | 2687篇 |
综合类 | 41篇 |
航天 | 1524篇 |
出版年
2021年 | 63篇 |
2018年 | 174篇 |
2017年 | 128篇 |
2016年 | 132篇 |
2015年 | 54篇 |
2014年 | 182篇 |
2013年 | 247篇 |
2012年 | 211篇 |
2011年 | 283篇 |
2010年 | 230篇 |
2009年 | 345篇 |
2008年 | 376篇 |
2007年 | 238篇 |
2006年 | 192篇 |
2005年 | 227篇 |
2004年 | 189篇 |
2003年 | 256篇 |
2002年 | 171篇 |
2001年 | 274篇 |
2000年 | 138篇 |
1999年 | 168篇 |
1998年 | 208篇 |
1997年 | 153篇 |
1996年 | 194篇 |
1995年 | 271篇 |
1994年 | 227篇 |
1993年 | 135篇 |
1992年 | 159篇 |
1991年 | 83篇 |
1990年 | 75篇 |
1989年 | 164篇 |
1988年 | 72篇 |
1987年 | 73篇 |
1986年 | 70篇 |
1985年 | 244篇 |
1984年 | 196篇 |
1983年 | 170篇 |
1982年 | 170篇 |
1981年 | 242篇 |
1980年 | 78篇 |
1979年 | 53篇 |
1978年 | 63篇 |
1977年 | 61篇 |
1976年 | 48篇 |
1975年 | 68篇 |
1974年 | 47篇 |
1973年 | 47篇 |
1972年 | 63篇 |
1971年 | 49篇 |
1970年 | 49篇 |
排序方式: 共有8041条查询结果,搜索用时 15 毫秒
391.
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
392.
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
393.
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
394.
N. D. Akhmetov M. M. Gimadeev V. N. Drulis V. A. Krivosheev T. V. Rzaeva 《Russian Aeronautics (Iz VUZ)》2011,54(1):108-113
A technique for calculating the energy parameters of shock waves at electrical discharge in water is presented for the transition
region of discharge channel expansion using as the base the predetermined characteristics of discharge circuit. The technique
is based on the solution of energy transport equation that is similar in form to that of radiative transfer. The validity
of the presented approach was experimentally verified. 相似文献
395.
Systems for the indication and display of secondary information in avionics and autobasing complexes
A. A. Bagdasarov R. V. Anitropov O. V. Bagdasarova I. L. Livshits 《Russian Aeronautics (Iz VUZ)》2011,54(2):185-191
We consider the peculiarities of application for the cabin indicating systems of secondary information display, formulate
and systematize the compositional and technical requirements for display systems and their elements. The tendencies and lines
in the development of head-up displays for avionics and autobasing complexes were determined. The technique of calculating
optics of such display systems with the use of electronic distortion compensation is presented. 相似文献
396.
The paper describes a device and a technique of forming the information processing algorithms used in the integrated acoustic monitoring system for jet fuel tanks, intended for monitoring the level, density and mass of liquid products. 相似文献
397.
The results of investigating free oscillations of the International Space Station construction appearing during spacecraft docking and undocking are described. The study is carried out using the measurement
data of the low-frequency MAMS accelerometer. Several intervals of measurements performed in 2005 and 2006 were chosen to
be studied. For chosen intervals, only the data intervals corresponding to the process of free attenuation of the oscillations
construction elements were analyzed. Characteristic frequencies of elastic oscillations of the station construction and attenuation
coefficients corresponding to them are found. The comparative analysis of the results obtained for various docking ports (nodes)
is carried out. The described study is performed as a part of the technical experiment “The ISS Environment” carried out onboard the station in accordance with the Russian program of scientific and engineering experiments. 相似文献
398.
H.S. Ahluwalia J. Jackiewicz 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2012
The decay phase of the sunspot cycle 23 exhibited two unusual features. First, it lasted too long. Second, the interplanetary magnetic field intensity at earth orbit reached the lowest value since in situ measurements in space began in October 1963. These physical anomalies significantly altered the early forecasts for the sunspot activity parameters for cycle 24, made by several colleagues. We note that there was a significant change in the solar behavior during cycle 22. We discuss the observed trends and their effect on our empirical solar activity forecast technique, leading to our prediction for cycle 24 parameters; cycle 24 will be only half as active as cycle 23, reaching its peak in May 2013. We speculate on the possible implications of this outcome on future earth climate change and the ensuing socio-economic consequences. 相似文献
399.
400.
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