全文获取类型
收费全文 | 9848篇 |
免费 | 210篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 103篇 |
综合类 | 6篇 |
化学工业 | 1425篇 |
金属工艺 | 113篇 |
机械仪表 | 322篇 |
建筑科学 | 268篇 |
矿业工程 | 28篇 |
能源动力 | 146篇 |
轻工业 | 1033篇 |
水利工程 | 118篇 |
石油天然气 | 16篇 |
无线电 | 924篇 |
一般工业技术 | 1222篇 |
冶金工业 | 3352篇 |
原子能技术 | 108篇 |
自动化技术 | 883篇 |
出版年
2022年 | 79篇 |
2021年 | 159篇 |
2020年 | 94篇 |
2019年 | 105篇 |
2018年 | 95篇 |
2017年 | 123篇 |
2016年 | 101篇 |
2015年 | 97篇 |
2014年 | 142篇 |
2013年 | 385篇 |
2012年 | 238篇 |
2011年 | 335篇 |
2010年 | 284篇 |
2009年 | 298篇 |
2008年 | 342篇 |
2007年 | 307篇 |
2006年 | 300篇 |
2005年 | 252篇 |
2004年 | 217篇 |
2003年 | 231篇 |
2002年 | 226篇 |
2001年 | 185篇 |
2000年 | 176篇 |
1999年 | 209篇 |
1998年 | 778篇 |
1997年 | 492篇 |
1996年 | 428篇 |
1995年 | 303篇 |
1994年 | 253篇 |
1993年 | 258篇 |
1992年 | 114篇 |
1991年 | 131篇 |
1990年 | 138篇 |
1989年 | 137篇 |
1988年 | 142篇 |
1987年 | 138篇 |
1986年 | 109篇 |
1985年 | 133篇 |
1984年 | 95篇 |
1983年 | 103篇 |
1982年 | 71篇 |
1981年 | 90篇 |
1980年 | 70篇 |
1979年 | 80篇 |
1978年 | 70篇 |
1977年 | 110篇 |
1976年 | 201篇 |
1975年 | 74篇 |
1974年 | 71篇 |
1973年 | 64篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
141.
142.
Tracy L. Westeyn Gregory D. Abowd Thad E. Starner Jeremy M. Johnson Peter W. Presti Kimberly A. Weaver 《Personal and Ubiquitous Computing》2012,16(2):169-191
Previous research has established the connection between the way in which children interact with objects and the potential
early identification of children with autism. Those findings motivate our own work to develop "smart toys," objects embedded with wireless sensors that are safe and enjoyable for very small children, that allow detailed interaction
data to be easily recorded. These sensor-enabled toys provide opportunities for autism research by reducing the effort required
to collect and analyze a child’s interactions with objects. In the future, such toys may be a useful part of clinical and
in-home assessment tools. In this paper, we discuss the design of a collection of smart toys that can be used to automatically
characterize the way in which a child is playing. We use statistical models to provide objective, quantitative measures of
object play interactions. We also developed a tool to view rich forms of annotated play data for later analysis. We report
the results of recognition experiments on more than fifty play sessions conducted with adults and children as well as discuss
the opportunities for using this approach to support video annotation and other applications. 相似文献
143.
An improved bacterial foraging algorithm for combined static/dynamic environmental economic dispatch
Nicole Pandit Anshul Tripathi Shashikala Tapaswi Manjaree Pandit 《Applied Soft Computing》2012,12(11):3500-3513
Economic dispatch is carried out at the energy control center to find out the optimal output of thermal generating units such that power balance criterion is met, unit operating limits are satisfied and the fuel cost is minimized. With growing environmental awareness and strict government regulations throughout the world, it has become essential to optimize not only the total fuel cost but also the harmful emissions, both, under static as well as dynamic conditions. The static environment economic dispatch finds the optimal output of generating units for a fixed load demand at a given time, while the dynamic environmental economic dispatch schedules the output of online generators with changing power demands over a certain time period (normally one day) so as to minimize these two conflicting objectives, simultaneously. In this paper, the price penalty factor approach is employed for simultaneous minimization of cost and emission. The generator ramp rate constraints, non-convex and discontinuous nature of cost function and the large number of generators in practical power plants, make this problem very difficult to solve. Here, a fuzzy ranking approach is employed to identify the solution which offers the best compromise between cost and emission objectives. 相似文献
144.
Johnson CR 《Computing in science & engineering》2012,14(1):12-21
Advances in computational geometric modeling, imaging, and simulation let researchers build and test models of increasing complexity, generating unprecedented amounts of data. As recent research in biomedical applications illustrates, visualization will be critical in making this vast amount of data usable; it's also fundamental to understanding models of complex phenomena. 相似文献
145.
Future directions and research issues for ergonomics and advanced manufacturing technology (AMT) 总被引:1,自引:0,他引:1
In recent years, great progress has been made in the development of computer-based technologies that support the manufacturing industries. Those concerned with advanced manufacturing technology (AMT) are becoming increasingly aware of the fundamental importance of human organisational issues for the successful development, implementation, operation and maintenance of AMT. The discipline of industrial ergonomics and occupational occupational psychology, therefore, have a significant contribution to make in this field. This paper introduces the special issue, Ergonomics Matters in AMT, and presents a discussion of some of the future directions of AMT and the likely implications for ergonomics research. 相似文献
146.
Hunter S Howard M Marki P Gelpi MJ Francone J Reed G McGinty K Mayes B Ysmael R Johnson C 《Food management》1992,27(1):92-5, 98
Consumer confidence is at its lowest ebb since 1980. Economic growth is at a standstill & unemployment & inflation are both rising. Here's a front-line report from more than three dozen operators who are fending off the recession's dual pressures of slow sales & rising costs. They are using discount pricing, partnering with vendors, setting pay for performance standards & a variety of other recession-beating practices. 相似文献
147.
148.
149.
150.