全文获取类型
收费全文 | 4971篇 |
免费 | 25篇 |
国内免费 | 19篇 |
专业分类
航空 | 2254篇 |
航天技术 | 1689篇 |
综合类 | 11篇 |
航天 | 1061篇 |
出版年
2021年 | 42篇 |
2019年 | 27篇 |
2018年 | 163篇 |
2017年 | 117篇 |
2016年 | 84篇 |
2015年 | 46篇 |
2014年 | 117篇 |
2013年 | 138篇 |
2012年 | 129篇 |
2011年 | 202篇 |
2010年 | 147篇 |
2009年 | 230篇 |
2008年 | 259篇 |
2007年 | 159篇 |
2006年 | 112篇 |
2005年 | 142篇 |
2004年 | 141篇 |
2003年 | 166篇 |
2002年 | 112篇 |
2001年 | 184篇 |
2000年 | 94篇 |
1999年 | 96篇 |
1998年 | 117篇 |
1997年 | 84篇 |
1996年 | 128篇 |
1995年 | 145篇 |
1994年 | 135篇 |
1993年 | 68篇 |
1992年 | 101篇 |
1991年 | 43篇 |
1990年 | 43篇 |
1989年 | 101篇 |
1988年 | 39篇 |
1987年 | 39篇 |
1986年 | 49篇 |
1985年 | 139篇 |
1984年 | 117篇 |
1983年 | 82篇 |
1982年 | 96篇 |
1981年 | 148篇 |
1980年 | 32篇 |
1979年 | 30篇 |
1978年 | 33篇 |
1977年 | 36篇 |
1976年 | 23篇 |
1975年 | 39篇 |
1974年 | 35篇 |
1973年 | 28篇 |
1970年 | 22篇 |
1969年 | 22篇 |
排序方式: 共有5015条查询结果,搜索用时 546 毫秒
221.
V. A. Kudinov A. V. Eremin A. E. Kuznetsova E. V. Stefanyuk 《Russian Aeronautics (Iz VUZ)》2014,57(1):37-44
An exact analytical solution of the thermoelasticity problem is presented for a multilayer shallow cylinder with physical properties of the medium that are constant in the limits of each layer. The effect of thermal shock of different intensity as well as the penetration depth of thermal disturbance on the distribution of radial and circumferential thermal stresses has been studied as applied to the one- and two-layer cylinder. It has been shown that the circumferential compressive stresses appear on the external surface of the cylinder under thermal shock while the tensile stresses appear on the internal surface. 相似文献
222.
223.
224.
225.
Based on an integrated approach, we solve the optimization problem for energy content and weight-dimensional characteristics of the electric servo drive by synthesis of structure and analysis of characteristics for different power supplies. The generalized power supply model, developed for different power supply of drive control systems, is given. 相似文献
226.
E. O. Ariskin A. V. Nikitin V. V. Soldatkin V. M. Soldatkin 《Russian Aeronautics (Iz VUZ)》2015,58(4):454-460
The problem and features of measuring the speed and the direction angle of the wind vector relative to the longitudinal helicopter axis during parking, starting and takeoff-landing modes by onboard means are considered. The construction principles, information processing algorithms and advantages of onboard system for measuring the wind vector parameters based on ion-beacon and aerometric measuring channels, are disclosed. 相似文献
227.
We consider the stability of stationary motions of a model of a spacecraft as a system of coaxial bodies with small asymmetry caused by the shift of the axes of dynamic symmetry of bodies relative to the axis of rotation. We determine the stationary motions of the system; their stability is studied with respect to both the projections of angular velocity and the position of the axis of rotation. The sufficient conditions for the stability of these stationary motions are obtained by constructing a Lyapunov function, and the necessary conditions are obtained by analyzing the corresponding linearized equations of perturbed motion. 相似文献
228.
This paper presents the results of analyzing the shaping of thin-walled conical parts with the uniform thickness along generatrix. 相似文献
229.
230.
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