全文获取类型
收费全文 | 459篇 |
免费 | 5篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 23篇 |
综合类 | 1篇 |
化学工业 | 83篇 |
金属工艺 | 15篇 |
机械仪表 | 12篇 |
建筑科学 | 6篇 |
矿业工程 | 1篇 |
能源动力 | 26篇 |
轻工业 | 15篇 |
水利工程 | 1篇 |
无线电 | 56篇 |
一般工业技术 | 69篇 |
冶金工业 | 96篇 |
原子能技术 | 16篇 |
自动化技术 | 46篇 |
出版年
2022年 | 7篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 6篇 |
2015年 | 9篇 |
2014年 | 12篇 |
2013年 | 17篇 |
2012年 | 15篇 |
2011年 | 24篇 |
2010年 | 16篇 |
2009年 | 17篇 |
2008年 | 18篇 |
2007年 | 26篇 |
2006年 | 26篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 7篇 |
2002年 | 14篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 8篇 |
1998年 | 35篇 |
1997年 | 33篇 |
1996年 | 17篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 7篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1986年 | 9篇 |
1985年 | 9篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有466条查询结果,搜索用时 15 毫秒
101.
Kazuhiro Kudo Masaaki Iizuka Shigekazu Kuniyoshi Kuniaki Tanaka 《Electrical Engineering in Japan》2001,134(1):10-16
We fabricated field effect transistors (FETs) using door (TTF, TMTSF) and acceptor (TCNQ) molecules, and we investigated the change of conductivity in the charge transfer (CT) complex layer by applying gate voltages. Several types of FETs having TTF/TCNQ and TMTSF/TCNQ layered structures were examined. The stacked‐layer FET showed a large transconductance compared with a single‐layer FET. The experimental results demonstrate that the CT complex layer formed between donor and acceptor films mainly works as a conduction channel. Furthermore, the change in the degree of charge transfer corresponding to conductivity change was confirmed by infrared absorption spectra. © 2000 Scripta Technica, Electr Eng Jpn, 134(1): 10–16, 2001 相似文献
102.
103.
104.
Hiroshi Senoh Tetsu KiyobayashiNobuhiro Kuriyama Kuniaki TatsumiKazuaki Yasuda 《Journal of power sources》2007
We present electrochemical properties of lithium alanate (LiAlH4) dissolved in aprotic ethers – diethyl ether (Et2O) and tetrahydrofuran (THF) – under an Ar atmosphere of 1 atm at 298 K. Specific conductivities of both LiAlH4–THF and LiAlH4–Et2O solutions are measured by AC four-terminal method. Cyclic voltammetry is performed with using a beaker-type electrochemical cell consisted of a Ni wire, Ni mesh and Li wire as a working, counter and reference electrode, respectively. In order to clarify the electrochemical behavior, anodic polarization of LiAlH4–THF solution is measured. The current density of 1.0 M LiAlH4–THF solution reaches to 1 A cm−2, which is higher than the LiAlH4–Et2O solution. Quantitative analysis of H2 gas generated on the working electrode during the potentiostatic electrolysis tells that the number of electrons involved in the anodic reaction at the limiting current is one in case of the LiAlH4–THF solution. We propose conceivable electrochemical reactions of LiAlH4 in the non-aqueous ethereal solutions. 相似文献
105.
106.
107.
Ishikawa F Oishi M Shindo T Horie M Yasui A Uehara S Ogino S Ito K 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2005,46(3):93-98
Hajikami (ginger pickled in vinegar) is often used as a relish for grilled fish, and it often contains coloring agents. We detected Rose Bengal (R105) and two unknown dyes in some Hajikami by thin layer chromatography. In this study, we tried to characterize these unknown dyes by HPLC with photodiode array detection (PDA-HPLC), liquid chromatography/mass spectrometry (LC/MS) and nuclear magnetic resonance (NMR). PDA-HPLC analysis showed that the spectra of the unknown dyes resembled that of R105, suggesting the molecular structures of these two dyes are similar to that of R105. Furthermore, LC/MS analysis suggested that the these dyes are R105 in which one or two iodines are replaced by hydrogen. Finally, the two dyes were determined by 1H-NMR and 13C-NMR to be 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',7'-diiodo spiro[isobenzofuran- 1 (3H),9'-[9H]xanthen]-3-one disodium salt and 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',7'-diiodo spiro[isobenzofuran-1(3H),9'[9H]xanthen]-3-one disodium salt. 相似文献
108.
109.
110.
A membrane precursor was prepared by the copolymerization of p-styrenesulfonyl chloride and divinylbenzene in the presence of a poly(vinyl chloride) supported cloth. The surface of the membrane was treated with various amines, and then the sulfonyl chloride groups in the internal part of the membrane were hydrolyzed with an aqueous sodium hydroxide solution in organic methanol or acetone solvent. Hydrolysis conditions were examined for the introduction of the sulfonic acid groups. The membrane modified by ethylenediamine exhibited slightly bipolar properties during the electrodialysis of seawater. Surface-modified membranes using tetraethylenepentamine exhibited excellent monovalent cation permselectivity, low membrane electric resistance, and long performance durability during the electrodialysis of seawater. 相似文献