全文获取类型
收费全文 | 25076篇 |
免费 | 2045篇 |
国内免费 | 857篇 |
专业分类
电工技术 | 1321篇 |
技术理论 | 1篇 |
综合类 | 1379篇 |
化学工业 | 4504篇 |
金属工艺 | 1317篇 |
机械仪表 | 1318篇 |
建筑科学 | 1861篇 |
矿业工程 | 578篇 |
能源动力 | 884篇 |
轻工业 | 1636篇 |
水利工程 | 339篇 |
石油天然气 | 1342篇 |
武器工业 | 118篇 |
无线电 | 3111篇 |
一般工业技术 | 3240篇 |
冶金工业 | 1438篇 |
原子能技术 | 314篇 |
自动化技术 | 3277篇 |
出版年
2024年 | 84篇 |
2023年 | 407篇 |
2022年 | 699篇 |
2021年 | 1022篇 |
2020年 | 720篇 |
2019年 | 674篇 |
2018年 | 694篇 |
2017年 | 809篇 |
2016年 | 758篇 |
2015年 | 923篇 |
2014年 | 1239篇 |
2013年 | 1583篇 |
2012年 | 1575篇 |
2011年 | 1723篇 |
2010年 | 1398篇 |
2009年 | 1443篇 |
2008年 | 1342篇 |
2007年 | 1238篇 |
2006年 | 1349篇 |
2005年 | 1164篇 |
2004年 | 841篇 |
2003年 | 759篇 |
2002年 | 760篇 |
2001年 | 541篇 |
2000年 | 521篇 |
1999年 | 601篇 |
1998年 | 572篇 |
1997年 | 462篇 |
1996年 | 446篇 |
1995年 | 345篇 |
1994年 | 280篇 |
1993年 | 190篇 |
1992年 | 174篇 |
1991年 | 117篇 |
1990年 | 92篇 |
1989年 | 72篇 |
1988年 | 88篇 |
1987年 | 48篇 |
1986年 | 44篇 |
1985年 | 25篇 |
1984年 | 33篇 |
1983年 | 19篇 |
1982年 | 27篇 |
1981年 | 12篇 |
1980年 | 10篇 |
1979年 | 15篇 |
1977年 | 4篇 |
1976年 | 9篇 |
1975年 | 4篇 |
1965年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
32.
Shiao-Shien Chen Tung-Yang Chen Tien-Hao Tang Jin-Lian Su Tzer-Min Shen Jen-Kon Chen 《Electron Devices, IEEE Transactions on》2003,50(7):1683-1689
This paper proposes a novel low-leakage BiCMOS deep-trench (DT) diode in a 0.18-/spl mu/m silicon germanium (SiGe) BiCMOS process. By means of the DT and an n/sup +/ buried layer in the SiGe BiCMOS process, a parasitic vertical p-n-p bipolar transistor with an open-base configuration is formed in the BiCMOS DT diode. Based on the two-dimensional (2-D) simulation and measured results, the BiCMOS DT diode indeed has the lowest substrate leakage current as compared to the conventional p/sup +//n-well diode even at high temperature conditions, which mainly results from the existence of the parasitic open-base bipolar transistor. Considering the applications of the diode string in electrostatic discharge (ESD) protection circuit designs, the BiCMOS DT diode string also provides a good ESD performance. Owing to the characteristics of the low leakage current and high ESD robustness, it is very convenient for circuit designers to use the BiCMOS DT diode string in their IC designs. 相似文献
33.
A vacuum-annealed La0.6Ca0.4CoO3−x was consecutively oxygenated in air at temperatures decreasing from 800 to 100 °C, and its electrocatalytic activities for oxygen reduction and evolution were then measured as a function of the oxygenation temperature. The valence of Co cation, changing between +2 and +3, was found susceptible to annealing either in vacuum or air. The catalytic activities initially decrease monotonically as the oxygenation temperature was decreased from 800 to 300 °C, as a result of increasing oxygen content, and then rise abruptly with the oxygen reduction activity reaching a maximum at 200 °C and the oxidation activity at 150 °C. X-ray photoelectron spectroscopy analysis indicated that the enhancements by the low-temperature oxygenation involved increased OH coverage and less charged cations at surface. The results clearly reveal the importance of the post-calcination annealing process for optimizing the performance of La0.6Ca0.4CoO3−x in air electrode applications. 相似文献
34.
35.
36.
Y.K. Su H.C. Wang C.L. Lin W.B. Chen S.M. Chen 《Photonics Technology Letters, IEEE》2003,15(10):1345-1347
The brightness of AlGaInP light emitting diodes (LEDs) has been raised by a factor of 1.12 at 20 mA by sulfide passivation. Meanwhile, the sulfide also can decrease leakage current of AlGaInP LEDs at -2 V to nearly one thousandth of that in the as-fabricated device. The possible causes for the brightness increase of AlGaInP LEDs after sulfide treatment including surface roughness, reduction of Fresnel loss, and effective injection of carriers were demonstrated. 相似文献
37.
洼60-H26水平井套铣打捞技术 总被引:3,自引:1,他引:2
洼60-H26井是一口中曲率水平井,设计井深1 922 m,由于地面条件的限制,设计采用三维井眼轨道。该井水平段在钻至井深1 801 m时,发生卡钻事故。在卡钻事故处理过程中,采用测卡、爆炸松扣技术取出上部钻具后,应用了不同规格的套铣管对被卡钻具进行套铣,采用间歇式套铣方式实现了大斜度井段(45°-90°)的安全套铣,采用短套铣管完成了时水平井段内φ215.0 mm稳定器的套铣,采用φ228.6 mm套铣管成功套铣水平井段被卡LWD仪器,最后通过震击器震击成功解卡。详细介绍了洼60-H26水平井卡钻事故的处理过程,分析了在水平段处理卡钻事故的难点。该井处理卡钻事故的经验,对以后水平井施工中处理井下事故、打捞贵重仪器具有借鉴价值。 相似文献
38.
本工艺是对原有工艺的改进,突破了原有布帮鞋不能采用无浆贴合的局限性,对原有工艺中的不足有了很大的改进,提高了生产效率,改善了鞋子外观质量,增加了鞋子的美观性。 相似文献
39.
This paper proposes a method to reduce the vibration of the three-phase HB-type stepping motor with cogging torque by the feedforward compensation control. The compensation signal to suppress the vibration of the motor frame is obtained by the repetitive controller installing an online Fourier transformer and utilizing an acceleration sensor attached to the motor frame or an acoustic sensor such as a microphone placed close to the frame. The sensor is used only for the acquisition of the feedforward compensation data. The feedforward compensation signal at an arbitrary operating point is derived from the amplitude and phase data of the frequency components and the operating point data. Compensation data obtained by the repetitive controller is applied to the operating point changed by reference frequency and load condition in steady state. The compensation signal for the new operating point will be generated from compensation data utilizing polynomial equation approximation and linear interpolation method. The effectiveness of this proposed method is confirmed by the experimental results. 相似文献
40.
HDPE/PS/HDPE-g-PS合金的相容性和力学性能研究 总被引:1,自引:0,他引:1
用自制接枝共聚物GR-Ⅰ、GR-Ⅱ相容剂研究其对HDPE/PS共混物相容性和力学性能的影响。通过SEM、DMA、DSC和力学性能测试表征,表明在HDPE/PS共混中加入这些相容剂其相容性和力学性能有一定提高 相似文献