全文获取类型
收费全文 | 16630篇 |
免费 | 1638篇 |
国内免费 | 1210篇 |
专业分类
电工技术 | 422篇 |
综合类 | 1456篇 |
化学工业 | 1785篇 |
金属工艺 | 229篇 |
机械仪表 | 541篇 |
建筑科学 | 7529篇 |
矿业工程 | 1259篇 |
能源动力 | 468篇 |
轻工业 | 115篇 |
水利工程 | 1914篇 |
石油天然气 | 73篇 |
武器工业 | 136篇 |
无线电 | 570篇 |
一般工业技术 | 1223篇 |
冶金工业 | 668篇 |
原子能技术 | 166篇 |
自动化技术 | 924篇 |
出版年
2024年 | 74篇 |
2023年 | 168篇 |
2022年 | 480篇 |
2021年 | 564篇 |
2020年 | 518篇 |
2019年 | 392篇 |
2018年 | 352篇 |
2017年 | 584篇 |
2016年 | 556篇 |
2015年 | 589篇 |
2014年 | 1172篇 |
2013年 | 888篇 |
2012年 | 1436篇 |
2011年 | 1598篇 |
2010年 | 1267篇 |
2009年 | 1276篇 |
2008年 | 1055篇 |
2007年 | 1276篇 |
2006年 | 1053篇 |
2005年 | 785篇 |
2004年 | 673篇 |
2003年 | 570篇 |
2002年 | 425篇 |
2001年 | 304篇 |
2000年 | 275篇 |
1999年 | 281篇 |
1998年 | 181篇 |
1997年 | 123篇 |
1996年 | 128篇 |
1995年 | 89篇 |
1994年 | 78篇 |
1993年 | 59篇 |
1992年 | 42篇 |
1991年 | 34篇 |
1990年 | 27篇 |
1989年 | 27篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 11篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 7篇 |
1979年 | 25篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1959年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The World robot summit disaster robotics category – achievements of the 2018 preliminary competition
Satoshi Tadokoro Tetsuya Kimura Masayuki Okugawa Katsuji Oogane Hiroki Igarashi Yoshikazu Ohtsubo 《Advanced Robotics》2019,33(17):854-875
The World Robot Summit is a robot Olympics and aims to be held in a different country every four years from 2020. The concept of the Plant Disaster Prevention challenge is daily inspections, checks, and emergency response in industrial plants, and in this competition, robots must carry out these types of missions in a mock-up plant. The concept of the Tunnel Disaster Response and Recovery challenge is emergency response to tunnel disasters, and is a simulation competition whereby teams compete to show their ability to deal with disasters, by collecting information and removing debris. The Standard Disaster Robotics challenge assesses, in the form of a contest, the standard performance levels of a robot that are necessary for disaster prevention and emergency response. The World Robot Summit Preliminary Competition was held at Tokyo Big Sight in October 2018, and 36 teams participated in the Disaster Robotics Category. UGVs and UAVs contended the merits of new technology for solving complex problems, using core technologies such as mobility, sensing, recognition, performing operations, human interface, autonomous intelligence etc., as well as system integration and implementation of strategies for completing missions, gaining high-level results. 相似文献
2.
3.
分析了乐滩灌区工程北干渠溯河隧洞段长约1.06 km穿合山煤矿采空区的地质情况.借鉴高速公路煤矿采空区的成功处理经验,通过科学分析,对采空区变形和区域内覆岩的稳定性做了评价,论述了输水线路穿采空区段采取全充填压力注浆法的工程处理方法. 相似文献
4.
广州地铁一号线隧道结构变形监测及成果分析 总被引:5,自引:0,他引:5
介绍了广州地铁一号线运营以来的全线隧道结构变形监测 ,分析了隧道结构的安全状况和各种变化规律 ,并对其变形原因进行有益的探讨 相似文献
5.
以姚河坝水电站引水隧洞50°倾角、长度为194.734m的斜井开挖为实例,从施工测量、开挖方法、通风防尘、临时支护斜井及安全施工等方面探讨长洞身、大倾角斜井在无爬罐条件下的人工开挖方法. 相似文献
6.
7.
Technology can take many forms from the development of sophisticated electronics to the application of basic procedural principles. Technology transfer can also take several forms, however, in this case, it is the transfer of technological principles between application domains that is of primary interest. This paper presents a framework (the Five ‘M’s framework) that can be used to consider the likely success of technology transfer. The framework is based upon a sociotechnical system approach. The framework is illustrated with an evaluation of the introduction of intelligent cruise control into motor vehicles. It is argued that this is a technological concept first developed as an aerospace application in the form of the autopilot. In this case, it is argued that the transfer of this technology in its current form may potentially compromise safety. 相似文献
8.
9.
The Jian kiln, located in present-day Jianyang county of Fujian province, mainly produced black-glazed tea bowls. Jian tea bowl was used as a utensil for tea tasting and was greatly appreciated by emperor Huizong of the Northern Song dynasty. The black glaze of Jian bowl was sometimes marked with streaks or spots, usually called “hare's fur” or “oil spot”, which are the crystalline markings of iron oxide precipitated during firing in the dragon kiln. In this study, black-glazed Jian bowl sherds excavated from the late Northern Song strata of Luhuaping and Daluhoumen Jian kiln sites were adopted as test samples. Based on the physico-chemical foundation for the formation of glaze microstructure, the correlation among composition, microstructure, and visual appearance has been investigated by means of energy-dispersive X-ray fluorescence, X-ray diffraction, and field emission electron microscopy. For the first time, the study provides realizing proofs for two kinds of microstructural forming mechanics. 相似文献
10.