全文获取类型
收费全文 | 4621篇 |
免费 | 724篇 |
国内免费 | 978篇 |
专业分类
航空 | 2675篇 |
航天技术 | 1319篇 |
综合类 | 845篇 |
航天 | 1484篇 |
出版年
2024年 | 11篇 |
2023年 | 19篇 |
2022年 | 54篇 |
2021年 | 67篇 |
2020年 | 137篇 |
2019年 | 47篇 |
2018年 | 63篇 |
2017年 | 56篇 |
2016年 | 86篇 |
2015年 | 149篇 |
2014年 | 296篇 |
2013年 | 285篇 |
2012年 | 328篇 |
2011年 | 304篇 |
2010年 | 439篇 |
2009年 | 358篇 |
2008年 | 354篇 |
2007年 | 327篇 |
2006年 | 254篇 |
2005年 | 229篇 |
2004年 | 150篇 |
2003年 | 154篇 |
2002年 | 133篇 |
2001年 | 196篇 |
2000年 | 192篇 |
1999年 | 229篇 |
1998年 | 218篇 |
1997年 | 176篇 |
1996年 | 165篇 |
1995年 | 126篇 |
1994年 | 113篇 |
1993年 | 125篇 |
1992年 | 99篇 |
1991年 | 96篇 |
1990年 | 70篇 |
1989年 | 82篇 |
1988年 | 51篇 |
1987年 | 34篇 |
1986年 | 16篇 |
1985年 | 9篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 5篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1969年 | 1篇 |
1900年 | 1篇 |
排序方式: 共有6323条查询结果,搜索用时 156 毫秒
911.
一般层合板矩形单元的几何刚度矩阵 总被引:1,自引:0,他引:1
本文简述了求解结构稳定性问题的有限元理论基础。用张量的形式指导了一般层合板矩形单元的节点力和节点位移关系方程,详细推导了一般层合板四节点矩形单元的几何刚度矩阵的公式及其显式。 相似文献
912.
913.
914.
为了研究地球同步轨道量子密钥分发过程中星地量子信道特性,项目团队研制了搭载于实践二十卫星的极弱光偏振态分发设备,开展了地球同步轨道卫星与地面间光子偏振态的传输实验。实验时,星载偏振光分发设备根据遥控指令以50MHz频率驱动四个激光器出光,分发|0〉、|π/2〉、|π/4〉和|3π/4〉四种偏振态光子,经过长距离的空间传输后由地面站望远镜接收,最后由超导探测器探测。研究结果表明,地球同步轨道卫星到地面站的光学链路衰减约为100~110 dB,通道误码率约为2%~8%,满足量子密钥分发误码率的安全性要求。 相似文献
915.
Shi Qian Liu James F. Whidborne Lei He 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2021,67(3):1174-1187
In the presence of unknown disturbances and model parameter uncertainties, this paper develop a nonlinear backstepping sliding-mode controller (BSMC) for trajectory tracking control of a stratospheric airship using a disturbance-observer (DO). Compared with the conventional sliding mode surface (SMS) constructed by a linear combination of the errors, the new SMS manifold is selected as the last back-step error to improve independence of the adjustment of the controller gains. Furthermore, a nonlinear disturbance-observer is designed to process unknown disturbance inputs and improve the BSMC performances. The closed-loop system of trajectory tracking control plant is proved to be globally asymptotically stable by using Lyapunov theory. By comparing with traditional backstepping control and SMC design, the results obtained demonstrate the capacity of the airship to execute a realistic trajectory tracking mission, even in the presence of unknown disturbances, and aerodynamic coefficient uncertainties. 相似文献
916.
It is difficult to quantitatively detect defects by using the time domain or frequency domain features of Lamb wave signals due to their dispersion and multimodal characteristics.Therefore,it is important to discover an intrinsical parameter of Lamb waves that could be used as a damage sensitive feature.In this paper,quantitative defect detection in aluminium plates is carried out by means of wavenumber analysis approach.The wavenumber of excited Lamb wave mode is a fixed value,given a frequency,a thickness and material properties of the target plate.When Lamb waves propagate to the structural discontinuity,new wavenumber components are created by abrupt wavefield change.The new wavenumber components can be identified in the frequency-wavenumber domain.To estimate spatially dependent wavenumber values,a short-space two-dimensional Fourier transform(FT)method is presented for processing wavefield data of Lamb waves.The results can be used to determine the location,size and depth of rectangular notch.The analysis techniques are demonstrated using simulation examples of an aluminium plate with a rectangular notch.Then,the wavenumber analysis method is applied to simulation data that are obtained through a range of notch depths and widths.The results are analyzed and rules of the technique with regards to estimating notch depth are determined.Based on simulation results,guidelines for using the technique are developed.Finally,experimental wavefield data are obtained in aluminium plates with rectangular notches by a full noncontact transceiving method,i.e.,laser-laser method.Band-pass filtering combined with continuous wavelet transform is used to extract a certain frequency component from the full laser-induced wavefield with wide band.Shortspace two-dimensional FT method is used for further processing full wavefield data at a certain frequency to estimate spatially dependent wavenumber values.The consistency of simulation and experimental results shows the effectiveness of proposed wavenumber method for quantitative rectangular notch detection. 相似文献
918.
To predict the performance of multi-direction piezoelectric vibration energy harvester,an equation for calculating its output power is obtained based on elastic mechanics theory and piezoelectricity theory.Experiments are performed to verify theoretical analysis.When the excitation direction is along Y direction,a maximal output power about 0.139 mW can be harvested at a resistive load of 65kΩ and an excitation frequency of 136 Hz.Theoretical analysis agrees well with experimental results.Furthermore,the performance of multi-direction vibration energy harvester is experimentally tested.The results show that the multi-direction vibration energy harvester can harvest perfect energy as the excitation direction changes in XY plane,YZ plane,XZ plane and body diagonal plane of the harvester. 相似文献
919.
康养产业在国内尚属于新型的一个产业,而中国的康养产业发展迅速,显示出了勃勃的生机和巨大的发展潜力,但同时也出现了很多问题,其中人才培养是重要的一个环节。当前高等院校在康养行业专业人才培养方面,已经进行了许多探索和尝试,但就整体而言,我国康养行业高校人才培养还存在诸多问题。本文通过分析国内康养人才培养的现状,同时结合雄安新区的实际情况,提出环雄安新区康养人才培养的策略。 相似文献
920.