全文获取类型
收费全文 | 5687篇 |
免费 | 186篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 28篇 |
化学工业 | 557篇 |
金属工艺 | 39篇 |
机械仪表 | 66篇 |
建筑科学 | 90篇 |
矿业工程 | 7篇 |
能源动力 | 89篇 |
轻工业 | 267篇 |
水利工程 | 30篇 |
石油天然气 | 7篇 |
无线电 | 290篇 |
一般工业技术 | 611篇 |
冶金工业 | 3383篇 |
原子能技术 | 17篇 |
自动化技术 | 399篇 |
出版年
2023年 | 32篇 |
2022年 | 53篇 |
2021年 | 87篇 |
2020年 | 62篇 |
2019年 | 94篇 |
2018年 | 101篇 |
2017年 | 77篇 |
2016年 | 91篇 |
2015年 | 72篇 |
2014年 | 109篇 |
2013年 | 162篇 |
2012年 | 152篇 |
2011年 | 209篇 |
2010年 | 140篇 |
2009年 | 133篇 |
2008年 | 170篇 |
2007年 | 151篇 |
2006年 | 115篇 |
2005年 | 94篇 |
2004年 | 74篇 |
2003年 | 66篇 |
2002年 | 60篇 |
2001年 | 25篇 |
2000年 | 34篇 |
1999年 | 121篇 |
1998年 | 1024篇 |
1997年 | 598篇 |
1996年 | 312篇 |
1995年 | 217篇 |
1994年 | 203篇 |
1993年 | 218篇 |
1992年 | 36篇 |
1991年 | 35篇 |
1990年 | 45篇 |
1989年 | 62篇 |
1988年 | 52篇 |
1987年 | 38篇 |
1986年 | 36篇 |
1985年 | 35篇 |
1984年 | 25篇 |
1983年 | 22篇 |
1982年 | 28篇 |
1981年 | 26篇 |
1980年 | 32篇 |
1979年 | 16篇 |
1978年 | 16篇 |
1977年 | 74篇 |
1976年 | 169篇 |
1974年 | 10篇 |
1971年 | 13篇 |
排序方式: 共有5880条查询结果,搜索用时 0 毫秒
121.
John S. McCloy Jarrod V. Crum S. K. Sundaram Ryan Slaugh Paul P. Woskov 《Journal of Infrared, Millimeter and Terahertz Waves》2011,32(11):1337-1349
Millimeter wave (MMW) radiometry can be used for simultaneous measurement of emissivity and temperature of materials under extreme environments such as in slagging coal gasifiers, where sensors have been identified as a key enabling technology need for process optimization. We present a dual-channel MMW heterodyne radiometer with active interferometric capability that allows simultaneous measurements of sample temperature, emissivity, and flow dynamics. Interferometric capability at 137 GHz is supplied via a probe signal originating from a local oscillator allowing monitoring of sample dynamics such as volume expansion and thickness change. This capability has been used to monitor characteristic behavior between refractories and slag such as slag infiltration, slag melting, viscous flow, foaming, and crucible corrosion by the molten slag. These results show the promise of the MMW system for extracting process parameters from operating slagging coal gasifiers, providing valuable information for process efficiency, control, and increased productivity. 相似文献
122.
123.
Research productivity affects the careers of academic psychologists. Unfortunately, there is a surprising lack of consensus on productivity’s meaning, measurement, and how to compare the productivity of one academic psychologist to another. In the present study, we review academic productivity research within psychology, and using a sample of 673 psychologists, compute six indexes of productivity. Most productivity metrics (publication count, citation count, or some combination of the two) were substantially interrelated and one (Integrated Research Productivity Index) was independent from years in the field. Female psychologists were equally as productive as male psychologists after accounting for years in the field, and pre-tenure psychologists showed steeper change-over-time productivity slopes than post-tenure psychologists. Based on these findings, we provide recommendations for the use and measurement of academic research productivity. 相似文献
124.
M. Ryan Calo 《Artificial Intelligence》2011,175(5-6):940-941
Robotics and artificial intelligence hold enormous promise but raise a variety of ethical and legal concerns, including with respect to privacy. Robotics and artificial intelligence implicate privacy in at least three ways. First, they increase our capacity for surveillance. Second, they introduce new points of access to historically private spaces such as the home. Finally, they trigger hardwired social responses that can threaten several of the values privacy protects. Responding to the privacy implications of robotics and artificial intelligence is likely to require a combination of design, law, and education. 相似文献
125.
126.
127.
128.
Piloting the Smart Grid 总被引:1,自引:0,他引:1
129.
130.