全文获取类型
收费全文 | 695篇 |
免费 | 69篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 14篇 |
化学工业 | 178篇 |
金属工艺 | 23篇 |
机械仪表 | 34篇 |
建筑科学 | 33篇 |
矿业工程 | 1篇 |
能源动力 | 33篇 |
轻工业 | 44篇 |
水利工程 | 19篇 |
石油天然气 | 7篇 |
无线电 | 105篇 |
一般工业技术 | 105篇 |
冶金工业 | 19篇 |
原子能技术 | 6篇 |
自动化技术 | 144篇 |
出版年
2024年 | 2篇 |
2023年 | 16篇 |
2022年 | 23篇 |
2021年 | 45篇 |
2020年 | 34篇 |
2019年 | 54篇 |
2018年 | 56篇 |
2017年 | 69篇 |
2016年 | 54篇 |
2015年 | 34篇 |
2014年 | 48篇 |
2013年 | 84篇 |
2012年 | 56篇 |
2011年 | 59篇 |
2010年 | 38篇 |
2009年 | 23篇 |
2008年 | 16篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 8篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1992年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有765条查询结果,搜索用时 15 毫秒
81.
In this article, an analytical technique is introduced to obtain the excitation coefficients of uniformly spaced linear antenna arrays in order to achieve a desired array factor. By integration of the prescribed array factor, the array factor dependency to the progressive phase shift is eliminated. A new system of linear equations is consequently obtained whose solution represents the excitation coefficients of the array. Some examples are presented to verify the accuracy of the introduced method. The performance of this strategy is compared with those obtained by the other well‐known techniques such as Woodward‐Lawson and Fourier transform. It is shown that the presented method estimates the desired array pattern with a very good precision. 相似文献
82.
83.
84.
European Journal of Wood and Wood Products - In the current research work, moisture gradients and moisture induced stresses (MiS) were investigated in cross laminated timber (CLT) bearing... 相似文献
85.
86.
The symmetrical and asymmetrical electrodes made of Mg were studied in 0.1-M NaCl electrolyte adjusted at pH 12. The statistical and wavelet methods were employed for analyzing the electrochemical current noise (ECN) signals. The asymmetric configuration was used for electrochemical detection of filiform corrosion on Mg electrode. The real time scale of the dominant transients of the asymmetric electrodes was detected on the basis of the maximum peak in the SDPS plots. The SDPS values of the real time scale crystals of the ECN signals resulting from asymmetrical electrodes increased with the increase in immersion time due to the onset of filiform corrosion. 相似文献
87.
88.
Wireless Personal Communications - Wireless sensor networks (WSNs) are ad hoc networks usually made up of miniaturized autonomous units called sensor nodes that communicate in between by radio... 相似文献
89.
90.