全文获取类型
收费全文 | 1373篇 |
免费 | 29篇 |
专业分类
电工技术 | 125篇 |
综合类 | 1篇 |
化学工业 | 432篇 |
金属工艺 | 30篇 |
机械仪表 | 36篇 |
建筑科学 | 29篇 |
能源动力 | 56篇 |
轻工业 | 138篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
无线电 | 83篇 |
一般工业技术 | 209篇 |
冶金工业 | 119篇 |
原子能技术 | 37篇 |
自动化技术 | 104篇 |
出版年
2022年 | 20篇 |
2021年 | 30篇 |
2020年 | 14篇 |
2019年 | 11篇 |
2018年 | 16篇 |
2017年 | 15篇 |
2016年 | 25篇 |
2015年 | 12篇 |
2014年 | 25篇 |
2013年 | 59篇 |
2012年 | 59篇 |
2011年 | 57篇 |
2010年 | 52篇 |
2009年 | 45篇 |
2008年 | 62篇 |
2007年 | 67篇 |
2006年 | 52篇 |
2005年 | 34篇 |
2004年 | 39篇 |
2003年 | 41篇 |
2002年 | 42篇 |
2001年 | 38篇 |
2000年 | 27篇 |
1999年 | 39篇 |
1998年 | 72篇 |
1997年 | 43篇 |
1996年 | 42篇 |
1995年 | 25篇 |
1994年 | 22篇 |
1993年 | 22篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 19篇 |
1989年 | 26篇 |
1988年 | 19篇 |
1987年 | 15篇 |
1986年 | 11篇 |
1985年 | 17篇 |
1984年 | 16篇 |
1983年 | 20篇 |
1982年 | 14篇 |
1981年 | 14篇 |
1980年 | 13篇 |
1979年 | 16篇 |
1978年 | 8篇 |
1977年 | 13篇 |
1976年 | 17篇 |
1975年 | 5篇 |
1974年 | 7篇 |
1973年 | 6篇 |
排序方式: 共有1402条查询结果,搜索用时 15 毫秒
1.
Khutoryan Eduard Kuleshov Alexei Ponomarenko Sergey Lukin Konstantin Tatematsu Yoshinori Tani Masahiko 《Journal of Infrared, Millimeter and Terahertz Waves》2021,42(6):671-683
Journal of Infrared, Millimeter, and Terahertz Waves - Various regimes of hybrid, bulk-surface, modes being excited in the clinotron oscillator with a sheet electron beam and nonuniform grating... 相似文献
2.
3.
4.
A dental student developed swelling of the lips and peri-oral urticaria, immediately after placement of a dental rubber dam during a chairside demonstration of clinical dentistry. A provisional diagnosis of a Type I hypersensitivity reaction to natural rubber latex was made and an appointment organised for specialist investigations. The student reported an atopic history and allergy to peanuts. A Radioallergosorbent Test (RAST), to measure Ig-E antibodies to latex, was positive. The dental student was given advice concerning the avoidance of natural rubber latex. Dental staff must be aware of potentially serious reactions to natural rubber latex in the dental surgery. 相似文献
5.
Fathy A.E. Pendrick V.A. Geller B.D. Perlow S.M. Tormey E.S. Prabhu A. Tani S. 《Microwave Theory and Techniques》2002,50(10):2247-2252
We have developed an innovative semianalytical technique for various substrate material characterization. The developed technique is a measurement procedure and data-reduction formulation that takes into consideration the radiation loss in a resonant structure, allowing for a more effective means of dielectric- and conductor-loss determination for a microstrip ring resonator and its substrate material. We separate dielectric and conductor loss precisely, evaluate the contribution of each term in the overall loss performance, and analytically predict the error in their respective predicted value. 相似文献
6.
7.
204 km, 10 Gbit/s standard optical fibre transmission is successfully demonstrated using the mid-span spectral inversion technique with a stimulated Brillouin scattering suppressed fibre phase conjugator, proposed recently by Tani and Yamashita. Transmission performance has been improved compared with a conventional phase conjugator. 相似文献
8.
Hideaki Katayama Tsutomu Tawa Shinzaburo Ito Masahide Yamamoto Yoshio Wada 《Polymer Bulletin》1992,29(3-4):365-367
Summary The effect of side chain length on intramolecular triplet energy migration of naphthalene containing polymers was investigated by a delayed fluorescence (DF) spectroscopy for the solid solution of the polymers. The degree of triplet energy migration depends strongly on whether the chromophores are directly attached to the main chain or not. 相似文献
9.
Bhupesh C. Roy Motonobu Goto & Tsutomu Hirose 《International Journal of Food Science & Technology》1996,31(2):137-141
Tomato seed oil was extracted with supercritical carbon dioxide in a semibatch-flow extractor within the temperature range 313–343 K and the pressure range 10.8–24.5MPa. The extraction rates increased with pressure, but decreased with temperature increase because of the variation in solvent density and resultant differences in oil solubility. The fatty acid composition of the extracted oil was similar to that of soybean oil. 相似文献
10.
Tsutomu Takeichi Yuki Saito Tarek Agag Hiroyuki Muto Takehiro Kawauchi 《Polymer》2008,49(5):1173-1179
Two series of high-performance polymer alloys were prepared by mixing typical benzoxine monomers, 3-phenyl-3,4-dihydro-2H-1,3-benzoxazine (P-a) or 6,6-(1-methylethyliden)-bis-(3,4-dihydro-3-phenyl-2H-1,3-benzoxazine) (B-a), with a typical bismaleimide, 4,4-bismaleimidodiphenyl methane by various ratios followed by thermal treatment up to 240 °C. DSC and IR of the alloys were examined to follow the curing reaction. These analyses showed that the obtained polymer alloys are AB co-cross-linked polymer networks through the formation of ether linkage between the hydroxyl group of polybenoxazine and the double bond of bismaleimide. Viscoelastic analysis and softening temperature measurement revealed that the polymer alloys have much higher glass transition temperatures than those of each homopolymer. The thermal stability also increased with the increase of bismaleimide content as evidenced by TGA. 相似文献