全文获取类型
收费全文 | 169739篇 |
免费 | 15523篇 |
国内免费 | 9275篇 |
专业分类
电工技术 | 11647篇 |
技术理论 | 9篇 |
综合类 | 12555篇 |
化学工业 | 26254篇 |
金属工艺 | 10242篇 |
机械仪表 | 11707篇 |
建筑科学 | 13187篇 |
矿业工程 | 5552篇 |
能源动力 | 5225篇 |
轻工业 | 11487篇 |
水利工程 | 3531篇 |
石油天然气 | 9768篇 |
武器工业 | 1733篇 |
无线电 | 19323篇 |
一般工业技术 | 19240篇 |
冶金工业 | 7433篇 |
原子能技术 | 2259篇 |
自动化技术 | 23385篇 |
出版年
2024年 | 593篇 |
2023年 | 2385篇 |
2022年 | 4630篇 |
2021年 | 6586篇 |
2020年 | 4866篇 |
2019年 | 4180篇 |
2018年 | 4707篇 |
2017年 | 5334篇 |
2016年 | 4780篇 |
2015年 | 6770篇 |
2014年 | 8676篇 |
2013年 | 10312篇 |
2012年 | 11686篇 |
2011年 | 12964篇 |
2010年 | 11786篇 |
2009年 | 11231篇 |
2008年 | 11195篇 |
2007年 | 10793篇 |
2006年 | 10430篇 |
2005年 | 8723篇 |
2004年 | 6188篇 |
2003年 | 5249篇 |
2002年 | 4956篇 |
2001年 | 4278篇 |
2000年 | 3850篇 |
1999年 | 3490篇 |
1998年 | 2609篇 |
1997年 | 2131篇 |
1996年 | 1978篇 |
1995年 | 1664篇 |
1994年 | 1305篇 |
1993年 | 994篇 |
1992年 | 731篇 |
1991年 | 570篇 |
1990年 | 430篇 |
1989年 | 358篇 |
1988年 | 283篇 |
1987年 | 191篇 |
1986年 | 150篇 |
1985年 | 108篇 |
1984年 | 77篇 |
1983年 | 59篇 |
1982年 | 59篇 |
1981年 | 46篇 |
1980年 | 36篇 |
1979年 | 21篇 |
1977年 | 15篇 |
1976年 | 11篇 |
1959年 | 17篇 |
1951年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
41.
Hyun Sun Choi Yun Kee Jo Gwang-Noh Ahn Kye Il Joo Dong-Pyo Kim Hyung Joon Cha 《Advanced functional materials》2021,31(46):2104602
The esophagus is a tubular-shaped muscular organ where swallowed fluids and muscular contractions constitute a highly dynamic environment. The turbulent, coordinated processes that occur through the oropharyngeal conduit can often compromise targeted administration of therapeutic drugs to a lesion, significantly reducing therapeutic efficacy. Here, magnetically guidable drug vehicles capable of strongly adhering to target sites using a bioengineered mussel adhesive protein (MAP) to achieve localized delivery of therapeutic drugs against the hydrodynamic physiological conditions are proposed. A suite of highly uniform microparticles embedded with iron oxide (IO) nanoparticles (MAP@IO MPs) is microfluidically fabricated using the genipin-mediated covalent cross-linking of bioengineered MAP. The MAP@IO MPs are successfully targeted to a specific region and prolongedly retained in the tubular-structured passageway. In particular, orally administered MAP@IO MPs are effectively captured in the esophagus in vivo in a magnetically guidable manner. Moreover, doxorubicin (DOX)-loaded MAP@IO MPs exhibit a sustainable DOX release profile, effective anticancer therapeutic activity, and excellent biocompatibility. Thus, the magnetically guidable locomotion and robust underwater adhesive properties of the proteinaceous soft microbots can provide an intelligent modular approach for targeted locoregional therapeutics delivery to a specific lesion site in dynamic fluid-associated tubular organs such as the esophagus. 相似文献
42.
43.
Wei Shaowei Yu Guoxian Wang Jun Domeniconi Carlotta Zhang Xiangliang 《Machine Learning》2021,110(6):1505-1526
Machine Learning - Traditional clustering algorithms focus on a single clustering result; as such, they cannot explore potential diverse patterns of complex real world data. To deal with this... 相似文献
44.
With the emergence of large-scale knowledge base, how to use triple information to generate natural questions is a key technology in question answering systems. The traditional way of generating questions require a lot of manual intervention and produce lots of noise. To solve these problems, we propose a joint model based on semi-automated model and End-to-End neural network to automatically generate questions. The semi-automated model can generate question templates and real questions combining the knowledge base and center graph. The End-to-End neural network directly sends the knowledge base and real questions to BiLSTM network. Meanwhile, the attention mechanism is utilized in the decoding layer, which makes the triples and generated questions more relevant. Finally, the experimental results on SimpleQuestions demonstrate the effectiveness of the proposed approach. 相似文献
45.
46.
Fluorescence‐Activated Cell Sorters: Standing Surface Acoustic Wave (SSAW)‐Based Fluorescence‐Activated Cell Sorter (Small 40/2018)
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
47.
48.
49.
50.
Science China Technological Sciences - Accurate modelling of lithium ion batteries is crucial for battery management in electric vehicles. Recent studies have revealed the fractional order nature... 相似文献