全文获取类型
收费全文 | 1917964篇 |
免费 | 51215篇 |
国内免费 | 18795篇 |
专业分类
电工技术 | 52058篇 |
技术理论 | 56篇 |
综合类 | 25666篇 |
化学工业 | 328852篇 |
金属工艺 | 82490篇 |
机械仪表 | 66336篇 |
建筑科学 | 73316篇 |
矿业工程 | 22372篇 |
能源动力 | 59260篇 |
轻工业 | 143622篇 |
水利工程 | 21635篇 |
石油天然气 | 58940篇 |
武器工业 | 2731篇 |
无线电 | 231647篇 |
一般工业技术 | 336243篇 |
冶金工业 | 231707篇 |
原子能技术 | 37290篇 |
自动化技术 | 213753篇 |
出版年
2022年 | 18506篇 |
2021年 | 27443篇 |
2020年 | 21001篇 |
2019年 | 21923篇 |
2018年 | 26071篇 |
2017年 | 26897篇 |
2016年 | 30975篇 |
2015年 | 29254篇 |
2014年 | 43982篇 |
2013年 | 105834篇 |
2012年 | 57902篇 |
2011年 | 74006篇 |
2010年 | 63013篇 |
2009年 | 69773篇 |
2008年 | 65511篇 |
2007年 | 62718篇 |
2006年 | 64333篇 |
2005年 | 57366篇 |
2004年 | 53409篇 |
2003年 | 52015篇 |
2002年 | 49711篇 |
2001年 | 46491篇 |
2000年 | 45144篇 |
1999年 | 46681篇 |
1998年 | 68726篇 |
1997年 | 55122篇 |
1996年 | 47517篇 |
1995年 | 39423篇 |
1994年 | 36000篇 |
1993年 | 34322篇 |
1992年 | 29316篇 |
1991年 | 26146篇 |
1990年 | 25921篇 |
1989年 | 24757篇 |
1988年 | 23160篇 |
1987年 | 20986篇 |
1986年 | 20413篇 |
1985年 | 23545篇 |
1984年 | 23223篇 |
1983年 | 21031篇 |
1982年 | 19807篇 |
1981年 | 19911篇 |
1980年 | 18541篇 |
1979年 | 18967篇 |
1978年 | 18146篇 |
1977年 | 18800篇 |
1976年 | 21316篇 |
1975年 | 16286篇 |
1974年 | 15764篇 |
1973年 | 15882篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Shchelkunov E. B. Vinogradov S. V. Shchelkunova M. E. Pronin A. I. Buravitsyn D. A. 《Russian Engineering Research》2020,40(5):367-371
Russian Engineering Research - The theoretically possible reconfigurable parallel mechanisms are classified, in terms of the layout of guides on the base. Formulas are derived for the... 相似文献
993.
Application of high‐temperature Fenton oxidation for the treatment of sulfonation plant wastewater 下载免费PDF全文
994.
Crespo Juan-José Sánchez José L. Alfaro-Cortés Francisco J. Flich José Duato José 《The Journal of supercomputing》2021,77(11):12826-12856
The Journal of Supercomputing - Deadlock-free dynamic network reconfiguration process is usually studied from the routing algorithm restrictions and resource reservation perspective. The dynamic... 相似文献
995.
Programming and Computer Software - In this paper, we overview the approaches and techniques employed by the Svace static analysis tool for intraprocedural analysis. This analysis implies the... 相似文献
996.
Neural Computing and Applications - The goal of this paper is to introduce a novel hybrid model called multi-fuzzy N-soft set, and to design an adjustable decision-making methodology for solving... 相似文献
997.
A device able to electrokinetically concentrate cationic samples has many potential medical and industrial applications, but until now has remained undeveloped due to the lack of a commercial anion-permselective material leading to a prohibitively complex fabrication procedure. Herein, a novel multiscale-porous anion exchange membrane (MP-AEM) that enables the convenient and scalable electrokinetic concentration of cationic species is proposed. A mechanically enhanced multiscale-porous structure with a solid framework is realized by adopting polyester resin as an additive to overcome the intrinsic limitations of the AEM material. The scalable MP-AEM-embedded electrokinetic concentrator is devised based on the peculiar properties of the MP-AEM that for allow both ion and fluid transport. With the MP-AEM, the concentrator is fabricated in a highly streamlined manner consisting only of a simple insertion and assembly. The concentration performance of the MP-AEM-embedded electrokinetic concentrator is demonstrated with a positively charged fluorescent dye and a fluorescein-labeled protein, and the results show enrichment factors of 250 and 500, respectively. The MP-AEM makes cationic electrokinetic concentration more accessible and scalable, thereby enabling further progress in a wide range of fields. 相似文献
998.
Programming and Computer Software - Modern computer systems often include specialized processors that are programmed in domain-specific languages. The compiler-in-the-loop technology, which assumes... 相似文献
999.
Wireless Personal Communications - This paper considers half-duplex cooperative spectrum sharing scheme where both primary and secondary systems mutually cooperate with each other to exploit... 相似文献
1000.