全文获取类型
收费全文 | 869篇 |
免费 | 35篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 13篇 |
综合类 | 11篇 |
化学工业 | 296篇 |
金属工艺 | 9篇 |
机械仪表 | 15篇 |
建筑科学 | 76篇 |
矿业工程 | 4篇 |
能源动力 | 13篇 |
轻工业 | 85篇 |
水利工程 | 3篇 |
无线电 | 45篇 |
一般工业技术 | 165篇 |
冶金工业 | 54篇 |
原子能技术 | 9篇 |
自动化技术 | 107篇 |
出版年
2023年 | 5篇 |
2022年 | 8篇 |
2021年 | 21篇 |
2020年 | 9篇 |
2019年 | 13篇 |
2018年 | 6篇 |
2017年 | 12篇 |
2016年 | 18篇 |
2015年 | 25篇 |
2014年 | 37篇 |
2013年 | 53篇 |
2012年 | 46篇 |
2011年 | 54篇 |
2010年 | 35篇 |
2009年 | 32篇 |
2008年 | 37篇 |
2007年 | 27篇 |
2006年 | 31篇 |
2005年 | 28篇 |
2004年 | 28篇 |
2003年 | 19篇 |
2002年 | 27篇 |
2001年 | 16篇 |
2000年 | 19篇 |
1999年 | 19篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 17篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 11篇 |
1992年 | 17篇 |
1991年 | 15篇 |
1990年 | 5篇 |
1989年 | 16篇 |
1987年 | 17篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 17篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 8篇 |
1975年 | 8篇 |
1974年 | 6篇 |
1973年 | 4篇 |
1970年 | 4篇 |
排序方式: 共有905条查询结果,搜索用时 218 毫秒
901.
Zeno Fldes-Papp Gerhard Gerber Reinhard Stsser Gerd Schneider 《Advanced Synthesis \u0026amp; Catalysis》1991,333(2):293-301
The decomposition of tert-butyl hydroperoxide by photochemically induced reactions in DMSO 1 Abbreviations used: DMSO, dimethyl sulfoxide; DMSO-d6, completely deuterium labelled dimethyl sulfoxide; cw-ESR, continuous-wave Electron Spin Resonance; u. v., ultra violet; DMPO, 5, 5-dimethyl-I-pyrroline N-oxide; TMPO, 3, 3, 5, 5-tetramethyl-l-pyrroline N-oxide. and water was investigated by cw-e.s.r. spectroscopy. The products tert-butylperoxyl, methyl and sulfur-centered free radicals were identified. The tert-butoxyl free radical is involved in the primary process as shown by time-resolved e.s.r. technique. On the basis of directly identified radical species, a mechanism for the photochemically induced reactions of tert-butyl hydroperoxide in DMSO is proposed. At concentrations below 0.8 mol · l−1 the radical formation from tert-butyl hydroperoxide proceeds by cleavage of the O O bond rather than by hydrogen abstraction. 相似文献
902.
903.
Dr. Paola Martinelli Dr. Otmar Schaaf Dr. Andreas Mantoulidis Dr. Laetitia J. Martin Dr. Julian E. Fuchs Dr. Gerd Bader Dr. Andreas Gollner Bernhard Wolkerstorfer Dr. Catherine Rogers Dr. Esra Balıkçı Dr. Jesse J. Lipp Dr. Nikolai Mischerikow Sandra Doebel Dr. Thomas Gerstberger Dr. Wolfgang Sommergruber Dr. Kilian V. M. Huber Dr. Jark Böttcher 《ChemMedChem》2023,18(6):e202200686
904.
Linda Schäker-Hübner Reza Haschemi Dr. Thomas Büch Fabian B. Kraft Birke Brumme Andrea Schöler Dr. Robert Jenke Prof. Dr. Jens Meiler Prof. Dr. Achim Aigner Prof. Dr. Gerd Bendas Prof. Dr. Finn K. Hansen 《ChemMedChem》2022,17(9):e202100755
Herein we report the structure-activity and structure-physicochemical property relationships of a series of class I selective ortho-aminoanilides targeting the “foot-pocket” in HDAC1&2. To balance the structural benefits and the physicochemical disadvantages of these substances, we started with a set of HDACi related to tacedinaline (CI-994) and evaluated their solubility, lipophilicity (log D7.4) and inhibition of selected HDAC isoforms. Subsequently, we selected the most promising “capless” HDACi and transferred its ZBG to our previously published scaffold featuring a peptoid-based cap group. The resulting hit compound 10 c ( LSH-A54) showed favorable physicochemical properties and is a potent, selective HDAC1/2 inhibitor. The following evaluation of its slow binding properties revealed that LSH-A54 binds tightly to HDAC1 in an induced-fit mechanism. The potent HDAC1/2 inhibitory properties were reflected by attenuated cell migration in a modified wound healing assay and reduced cell viability in a clonogenic survival assay in selected breast cancer cell lines. 相似文献
905.
Waste-Free Quantitative Gas/Solid Diazotation Using Nitrogen Dioxide and Triazene Synthesis, Both Avoiding Liquid Phases Solid diazonium nitrates (2a–j) are quantitatively obtained by reaction of crystalline anilines (1a–j) with gaseous nitrogen dioxide. Solid diazonium salts react quantitatively with dimethylamine to give the triazenes (4a–j) . Wastes that are typical for the previous syntheses of these compounds in solution are avoided. Atomic force microscopic (AFM) investigations indicate long-range molecular movements due to phase rebuilding. The features thus formed are related to the known crystal structures of the starting anilines. The diazotations run to completion, because, after accumulation of product molecules, phase transformation to give the product lattices leads to crystal disintegration and thus to formation of fresh surface over and over. 相似文献