全文获取类型
收费全文 | 2190篇 |
免费 | 79篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 51篇 |
综合类 | 2篇 |
化学工业 | 810篇 |
金属工艺 | 32篇 |
机械仪表 | 36篇 |
建筑科学 | 181篇 |
矿业工程 | 4篇 |
能源动力 | 71篇 |
轻工业 | 154篇 |
水利工程 | 5篇 |
石油天然气 | 2篇 |
无线电 | 116篇 |
一般工业技术 | 248篇 |
冶金工业 | 219篇 |
原子能技术 | 12篇 |
自动化技术 | 329篇 |
出版年
2022年 | 15篇 |
2021年 | 22篇 |
2020年 | 22篇 |
2019年 | 25篇 |
2018年 | 25篇 |
2017年 | 18篇 |
2016年 | 50篇 |
2015年 | 56篇 |
2014年 | 76篇 |
2013年 | 77篇 |
2012年 | 95篇 |
2011年 | 109篇 |
2010年 | 75篇 |
2009年 | 95篇 |
2008年 | 100篇 |
2007年 | 89篇 |
2006年 | 98篇 |
2005年 | 85篇 |
2004年 | 84篇 |
2003年 | 60篇 |
2002年 | 57篇 |
2001年 | 43篇 |
2000年 | 51篇 |
1999年 | 50篇 |
1998年 | 63篇 |
1997年 | 48篇 |
1996年 | 45篇 |
1995年 | 29篇 |
1994年 | 44篇 |
1993年 | 41篇 |
1992年 | 39篇 |
1991年 | 31篇 |
1990年 | 25篇 |
1989年 | 30篇 |
1988年 | 24篇 |
1987年 | 22篇 |
1986年 | 23篇 |
1985年 | 31篇 |
1984年 | 32篇 |
1983年 | 23篇 |
1982年 | 27篇 |
1981年 | 25篇 |
1980年 | 21篇 |
1979年 | 13篇 |
1978年 | 18篇 |
1977年 | 17篇 |
1976年 | 12篇 |
1975年 | 22篇 |
1973年 | 14篇 |
1972年 | 15篇 |
排序方式: 共有2272条查询结果,搜索用时 15 毫秒
91.
Rolf Sachsse 《History of Photography》2013,37(3):301-304
Abstract Winding up the estate of somebody is a sad task, only sustained by the hope of unexpected finds or definitive proof of one's preconceived opinions. There is no difference in this between one's own grandmother and a contemporary like Lucia Moholy. While executing this task I naturally came across various documents that shifted my vague assumptions about this versatile woman in different directions. I saw photographs from her private life that enlightened me about her social relations but, in the end, I was disappointed at not havlng been able to get closer to a person I thought I knew quite well, even if from a certain distance.1 相似文献
92.
93.
94.
Riener Heinz Haedicke Finn Frehse Stefan Soeken Mathias Große Daniel Drechsler Rolf Fey Goerschwin 《International Journal on Software Tools for Technology Transfer (STTT)》2017,19(5):605-621
International Journal on Software Tools for Technology Transfer - Many applications from artificial intelligence and formal methods use decision procedures as their core solving engines. In this... 相似文献
95.
96.
Jan Sumfleth Kirsten PrehnMalte H.G. Wichmann Sebastian WedekindKarl Schulte 《Composites Science and Technology》2010
In this study, three different types of multi-wall carbon nanotubes (MWCNTs) were compared as nanostructured reinforcements in epoxy polymers: commercially available CVD-MWCNTs, synthesised in an industrial process, aligned-CVD-MWCNTs and arc-grown MWCNTs, both obtained from a lab-scale processes. The nanocomposite properties were characterised by means of electron microscopy, rheological, electrical and mechanical methods. Industrial CVD-MWCNTs are favourable for the implication of an electrical conductivity in the epoxy due to their high tendency to form conducting networks. The less entangled structure of aligned-CVD-MWCNTs turns out to be favourable for an easy dispersion and low viscosity in epoxy at similar conductivities compared to the CVD-MWCNTs. Additionally, they provide the highest increase in fracture toughness (∼17%). Arc-grown MWCNTs do not offer any electrical conductivity in epoxy without sufficient purification methods. Their high level of impurities and short length further complicate the transfer of their good electrical and mechanical properties into the nanocomposite. 相似文献
97.
98.
Prof. Dr. Ruth Birner‐Gruenberger Prof. Dr. Rolf Breinbauer 《Chembiochem : a European journal of chemical biology》2016,17(16):1488-1490
Recently, Hang and co‐workers developed “acyl‐PEG exchange” (APE), which allows the investigation of protein S‐fatty acylation with mass‐tag labelling and gel electrophoresis, methods that are accessible to any biochemistry laboratory. 相似文献
99.
Greg Mann Dr. Liujie Huo Sebastian Adam Dr. Brunello Nardone Dr. Jeremie Vendome Prof. Nicholas James Westwood Prof. Rolf Müller Dr. Jesko Koehnke 《Chembiochem : a European journal of chemical biology》2016,17(23):2286-2292
The bottromycins are a family of highly modified peptide natural products, which display potent antimicrobial activity against Gram‐positive bacteria, including methicillin‐resistant Staphylococcus aureus. Bottromycins have recently been shown to be ribosomally synthesized and post‐translationally modified peptides (RiPPs). Unique amongst RiPPs, the precursor peptide BotA contains a C‐terminal “follower” sequence, rather than the canonical N‐terminal “leader” sequence. We report herein the structural and biochemical characterization of BotP, a leucyl‐aminopeptidase‐like enzyme from the bottromycin pathway. We demonstrate that BotP is responsible for the removal of the N‐terminal methionine from the precursor peptide. Determining the crystal structures of both apo BotP and BotP in complex with Mn2+ allowed us to model a BotP/substrate complex and to rationalize substrate recognition. Our data represent the first step towards targeted compound modification to unlock the full antibiotic potential of bottro‐ mycin. 相似文献
100.