全文获取类型
收费全文 | 19115篇 |
免费 | 124篇 |
国内免费 | 527篇 |
专业分类
航空 | 10458篇 |
航天技术 | 5659篇 |
综合类 | 334篇 |
航天 | 3315篇 |
出版年
2021年 | 177篇 |
2018年 | 223篇 |
2016年 | 174篇 |
2014年 | 460篇 |
2013年 | 589篇 |
2012年 | 487篇 |
2011年 | 641篇 |
2010年 | 418篇 |
2009年 | 786篇 |
2008年 | 815篇 |
2007年 | 379篇 |
2006年 | 446篇 |
2005年 | 429篇 |
2004年 | 505篇 |
2003年 | 604篇 |
2002年 | 524篇 |
2001年 | 690篇 |
2000年 | 434篇 |
1999年 | 491篇 |
1998年 | 435篇 |
1997年 | 336篇 |
1996年 | 395篇 |
1995年 | 476篇 |
1994年 | 458篇 |
1993年 | 385篇 |
1992年 | 366篇 |
1991年 | 386篇 |
1990年 | 348篇 |
1989年 | 522篇 |
1988年 | 221篇 |
1987年 | 242篇 |
1986年 | 237篇 |
1985年 | 652篇 |
1984年 | 526篇 |
1983年 | 413篇 |
1982年 | 490篇 |
1981年 | 612篇 |
1980年 | 247篇 |
1979年 | 187篇 |
1978年 | 189篇 |
1977年 | 146篇 |
1976年 | 155篇 |
1975年 | 193篇 |
1974年 | 180篇 |
1973年 | 161篇 |
1972年 | 188篇 |
1971年 | 148篇 |
1970年 | 143篇 |
1969年 | 147篇 |
1967年 | 142篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
281.
V. M. Soldatkin A. A. Arkhipov V. A. Olaev A. A. Uglov 《Russian Aeronautics (Iz VUZ)》2012,55(2):184-191
We consider the function, the problems being solved and the construction principles for a starting system of warning the critical regimes for a single-rotor helicopter at parking, taxiing and maneuvering on the ground, takeoff and landing as well as at descending and hovering regimes. The structural-functional scheme and the algorithms of system channel warning are presented. 相似文献
282.
283.
A problem of transverse bending of elastic isotropic parallelogram plates under the action of uniformly distributed load is considered. The plate sides are either pivoted or rigidly restrained. To determine the value of maximum plate deflection, it is proposed that an interpolation technique with respect to form factor be used; and as a geometrical argument, an inner-outer conformal radius ratio can be applied instead of the form factor. 相似文献
284.
E. M. Korovin 《Russian Aeronautics (Iz VUZ)》2012,55(3):326-331
In this paper, a mathematical model of labor-intensity and a method of searching for optimal control of operating conditions in machining arbitrarily configurated parts with the use of CNC machines are considered. Also given is an example of the process optimization.. 相似文献
285.
In this paper a linear, closed-form analysis of the buckling behavior of an orthotropic plate with elastic clamping and edge reinforcement under uniform compressive load is presented. This is a typical structural situation found in aerospace engineering for instance as stiffeners in wings or the fuselage. All governing equations are transformed in a dimensionless system using common characteristic quantities to gain good analytical access. The buckling behavior is analyzed and generic buckling diagrams are presented. The solutions show excellent agreement with results from literature and numerical analyses.The minimum bending stiffness of the edge reinforcement needed to withstand buckling is examined and a minimum stiffness criterion is presented. Furthermore an absolute minimum bending stiffness is found which is sufficient to enable the reinforcement to act as a near-rigid support for arbitrarily long plates. These criteria are of interest for optimized lightweight design of stringers and stiffeners. 相似文献
286.
A model of the main support of the aircraft landing gear is presented and its dynamics is studied using the equations for the distributed motion of a wheel equipped with a brake. Stability of the support wheel rolling motion is analyzed and the brake parameter values which may cause stability loss are found. The results of numerical experiments are presented. 相似文献
287.
In this paper, we consider some typical values of motion parameters in exceptional situations when approaching to the helicopter critical flight regimes and present a technique for constructing the partial and integral informative functions of hazards at current flight regimes. Also described are the possibilities of their use for solving the problems of warning, informative crew support, and synthesizing the control algorithms to remove helicopter from the exceptional situation occurred. 相似文献
288.
A. Yu. Liss 《Russian Aeronautics (Iz VUZ)》2012,55(2):136-143
We present the materials, which substantiate the application of a rather simple approximate method of accounting for disturbances of the airflow around the helicopter main rotor blades; in this case, the disturbances are caused by vortices that come down from the blade ends. It is shown that these disturbances influence significantly the varying blade loads. 相似文献
289.
V. A. Trushin 《Russian Aeronautics (Iz VUZ)》2013,56(4):372-378
The finite-difference method acceptable for on-board computers is applied to analyze the thermo-stressed state for the thermal-barrier coating of a perforated turbine blade and its wall at transient and stationary conditions of air-breathing jet engine operation during a flight. 相似文献
290.
The paper presents the results of calculating nonstatitionary heat exchange between a heattransfer agent (water) and a gadolinium working element of the thermomagnetic engine with the use of ANSYS 13.0 certified software. Recommendations for designing the thermomagnetic engine working elements are given based on the analysis of calculation results. 相似文献