全文获取类型
收费全文 | 6748篇 |
免费 | 478篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 79篇 |
综合类 | 2篇 |
化学工业 | 1979篇 |
金属工艺 | 125篇 |
机械仪表 | 203篇 |
建筑科学 | 286篇 |
矿业工程 | 24篇 |
能源动力 | 263篇 |
轻工业 | 976篇 |
水利工程 | 60篇 |
石油天然气 | 35篇 |
无线电 | 416篇 |
一般工业技术 | 1048篇 |
冶金工业 | 319篇 |
原子能技术 | 47篇 |
自动化技术 | 1373篇 |
出版年
2024年 | 23篇 |
2023年 | 97篇 |
2022年 | 272篇 |
2021年 | 312篇 |
2020年 | 209篇 |
2019年 | 231篇 |
2018年 | 278篇 |
2017年 | 292篇 |
2016年 | 279篇 |
2015年 | 233篇 |
2014年 | 315篇 |
2013年 | 575篇 |
2012年 | 450篇 |
2011年 | 553篇 |
2010年 | 381篇 |
2009年 | 411篇 |
2008年 | 346篇 |
2007年 | 320篇 |
2006年 | 266篇 |
2005年 | 202篇 |
2004年 | 151篇 |
2003年 | 165篇 |
2002年 | 135篇 |
2001年 | 76篇 |
2000年 | 83篇 |
1999年 | 66篇 |
1998年 | 52篇 |
1997年 | 61篇 |
1996年 | 54篇 |
1995年 | 42篇 |
1994年 | 30篇 |
1993年 | 32篇 |
1992年 | 15篇 |
1991年 | 22篇 |
1990年 | 15篇 |
1989年 | 20篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 11篇 |
1985年 | 15篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1982年 | 16篇 |
1981年 | 6篇 |
1980年 | 9篇 |
1979年 | 10篇 |
1978年 | 22篇 |
1976年 | 9篇 |
1975年 | 7篇 |
1973年 | 5篇 |
排序方式: 共有7235条查询结果,搜索用时 15 毫秒
941.
942.
943.
944.
945.
Neural Computing and Applications - Artificial neural networks have been proposed in medical research as an alternative to some regression models such as the generalized linear models, being the... 相似文献
946.
Danilo Tardioli Luis Riazuelo Domenico Sicignano Carlos Rizzo Francisco Lera Jos L. Villarroel Luis Montano 《野外机器人技术杂志》2019,36(6):1074-1101
The work reported in this article describes the research advances and the lessons learned by the Robotics, Perception and Real‐Time group over a decade of research in the field of ground robotics in confined environments. This study has primarily focused on localization, navigation, and communications in tunnel‐like environments. As will be discussed, this type of environment presents several special characteristics that often make well‐established techniques fail. The aim is to share, in an open way, the experience, errors, and successes of this group with the robotics community so that those that work in such environments can avoid (some of) the errors made. At the very least, these findings can be readily taken into account when designing a solution, without needing to sift through the technical details found in the papers cited within this text. 相似文献
947.
948.
949.
Osuna-Ruiz Idalia Espinoza-Marroquin María Fernanda Salazar-Leyva Jesús Aarón Peña Emyr Álvarez-González Carlos Alfonso Bañuelos-Vargas Isaura Martínez-Montaño Emmanuel 《Food science and biotechnology》2019,28(6):1785-1793
Food Science and Biotechnology - Pepsin from stomach of Bagre panamensis was semi-purified and biochemically characterized. The acid proteolytic activity and purification fold were... 相似文献
950.
Roberta Valmorbida Geovana D. Savi Juliana R. Silva Monica M.O. Yanez Carlos E.S. Soares Cristina Runtzel 《Food Additives and Contaminants: Part B: Surveillance Communications》2018,11(1):54-63
The quality and safety of maize (Zea mays L.) from different grain storage units (GSUs), located in the main producing region of Rondônia State, Northern Brazil, were evaluated. Maize grains (n = 76) stored in four GSUs were collected from July to November 2014 and evaluated for grain damages, humidity, fungi and fumonisins (FBs) content. The climate conditions data were also obtained from plant growing to storage periods. Regarding the moisture content and water activity (aw), these varied from 10.0% to 16.1% and 0.5 to 0.8, respectively. As expected, fungi spores were present in 94.8% of the samples, prevailing Fusarium genera, with a fungi colony maximum of 2.2 × 104 CFU g?1. Regarding FBs, 60.5% of the samples were contaminated, below Brazilian and United States maximum limits, but 9.2% had levels higher than the European legislation. 相似文献