全文获取类型
收费全文 | 34976篇 |
免费 | 2422篇 |
国内免费 | 985篇 |
专业分类
电工技术 | 1482篇 |
技术理论 | 4篇 |
综合类 | 1553篇 |
化学工业 | 6073篇 |
金属工艺 | 1535篇 |
机械仪表 | 1669篇 |
建筑科学 | 1689篇 |
矿业工程 | 758篇 |
能源动力 | 1194篇 |
轻工业 | 2227篇 |
水利工程 | 448篇 |
石油天然气 | 1010篇 |
武器工业 | 146篇 |
无线电 | 5406篇 |
一般工业技术 | 5071篇 |
冶金工业 | 2736篇 |
原子能技术 | 388篇 |
自动化技术 | 4994篇 |
出版年
2024年 | 105篇 |
2023年 | 449篇 |
2022年 | 863篇 |
2021年 | 1194篇 |
2020年 | 927篇 |
2019年 | 799篇 |
2018年 | 898篇 |
2017年 | 945篇 |
2016年 | 861篇 |
2015年 | 1069篇 |
2014年 | 1413篇 |
2013年 | 2116篇 |
2012年 | 1986篇 |
2011年 | 2309篇 |
2010年 | 1832篇 |
2009年 | 1878篇 |
2008年 | 1929篇 |
2007年 | 1739篇 |
2006年 | 1566篇 |
2005年 | 1254篇 |
2004年 | 1107篇 |
2003年 | 1190篇 |
2002年 | 1397篇 |
2001年 | 1177篇 |
2000年 | 816篇 |
1999年 | 709篇 |
1998年 | 977篇 |
1997年 | 690篇 |
1996年 | 577篇 |
1995年 | 474篇 |
1994年 | 388篇 |
1993年 | 332篇 |
1992年 | 247篇 |
1991年 | 221篇 |
1990年 | 225篇 |
1989年 | 199篇 |
1988年 | 170篇 |
1987年 | 153篇 |
1986年 | 129篇 |
1985年 | 127篇 |
1984年 | 110篇 |
1983年 | 75篇 |
1982年 | 70篇 |
1981年 | 59篇 |
1980年 | 81篇 |
1979年 | 49篇 |
1978年 | 60篇 |
1977年 | 58篇 |
1976年 | 76篇 |
1975年 | 43篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
F.S. Lien Chao-Kuang Chen Yih-Min Chang 《International Communications in Heat and Mass Transfer》1985,12(2):127-137
The effects of free convection and mass transfer are taken into account for the Stokes' problem of the flow near an impulsively moving infinite vertical circular cylinder. Expressions of the velocity, temperature, concentration and skin friction of the fluid in closed form are obtained by the Laplace transform technique. The results based on various values of the parameters Gr (Grashof number), Gm (modified Grashof number), Sc (Schmidt number) and Pr (Prandtl number) are given in graphical form. It will be seen that there is a rise in the velocity due to the presence of a foreign mass. But higher Sc yields the lower velocity and skin friction. As the radius of the circular cylinder approaches to infinite, the results presented in this paper agree with those of V.M. Soundalgekar's and C.K. Chen's etc. for the flow past an impulsively moving infinite vertical plate. 相似文献
122.
The electromagnetic properties of electrically thick rectangular microstrip antennas were investigated experimentally. Antennas were fabricated with different patch sizes and with electrical thicknesses ranging from 0.03 to 0.23 wavelengths in the dielectric substrate. The resonant frequencies were measured and compared to existing formulas. The bandwidth was calculated as a function of electrical thickness and the antenna radiation patterns were measured. 相似文献
123.
124.
Wang K.C. Asbeck P.M. Chang M.F. Sullivan G.J. Miller D.L. Basit H.F. 《Electronics letters》1989,25(17):1111-1112
The authors report a novel noninterfering and simple approach for evaluation of circuits implemented with AlGaAs/GaAs heterojunction bipolar transistors (HBTs). This method makes use of radiative recombination in the base region of current-carrying HBTs. The infrared radiation emitted is 'visible' to the closed-circuit TV (CCTV) cameras. Therefore, one can view the operation of the HBT circuit under test at normal biases with a TV monitor. This method can be used to determine logic states of gates, as well as collector current of individual HBTs within integrated circuits.<> 相似文献
125.
Presented is an eigen filter to remove autogenic electrical stimulation artefacts and M-waves while preserving the volitional electromyographic signal. The optimality of the eigen filter is shown, along with simulated and measured data to indicate its superior performance over conventional prediction error filters. 相似文献
126.
K.W. Chang W.W. Sorin 《Photonics Technology Letters, IEEE》1989,1(3):68-70
A novel type of polarization-independent optical isolator is described which utilizes the polarization walkoff provided by birefringent crystals. Isolation of 44 dB is measured at a wavelength of 1.3 mu m with single-mode fiber insertion loss of 1.5 dB. A temperature-independent scheme is also described that provides at least 39 dB of isolation over the temperature range of 25-75 degrees C.<> 相似文献
127.
High performance liquid chromatographic separation of a series of mono-, di- and trihydroxylated 5β-cholanic acids which differ
only in position and configuration of hydroxyl groups at positions C-3, C-7 and/or C-12, is reported. The C-24 free acids
were derivatized to four different classes of UV-sensitive esters, i.e.,p-bromophenacyl (BP),m-methoxyphenacyl (MP), 4-nitrophthalimidemethyl (NPM) and 9-anthrylmethyl (AM) esters, and chromatographed on two, variants
of C18 reversed-phase columns (Nova-Pak C18 and Zorbax ODS) with methanol-water systems as mobile phase. Separation efficiency and elution order of some isomeric pairs
were influenced by both the structure of the C-24 ester groups and the nature of the columns used. Excellent chromatographic
properties were found for those derivatives, particularly for the NPM esters. 相似文献
128.
安捷伦HFCT-5942 2.488GB/s LC小封装光纤收发模块是符合SONET和SDH标准,管脚为2×10的短距离单模光纤收发模块。 文中给出了三种不同应用的参考设计。在这些设计中,HFCT.5942光纤收发模块与以下芯片联接 相似文献
129.
Chang Tianle 《中国油气》2002,9(2)
China is likely to resume operation of its oil futures this year, according to reports from the media about a futures conference organized by the Shanghai Futures Exchange (SHFE) in late May. "As China has become an important oil producer and consumer,the demand for our own oil futures market emerges,which will help China oil-related enterprises hedge risks," said Li Ruisheng, vice president of PetroChina's refining and marketing company. 相似文献
130.