全文获取类型
收费全文 | 8371篇 |
免费 | 480篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 114篇 |
综合类 | 23篇 |
化学工业 | 2193篇 |
金属工艺 | 242篇 |
机械仪表 | 147篇 |
建筑科学 | 591篇 |
矿业工程 | 98篇 |
能源动力 | 282篇 |
轻工业 | 592篇 |
水利工程 | 50篇 |
石油天然气 | 20篇 |
武器工业 | 1篇 |
无线电 | 661篇 |
一般工业技术 | 1730篇 |
冶金工业 | 466篇 |
原子能技术 | 49篇 |
自动化技术 | 1600篇 |
出版年
2024年 | 15篇 |
2023年 | 117篇 |
2022年 | 208篇 |
2021年 | 329篇 |
2020年 | 199篇 |
2019年 | 211篇 |
2018年 | 231篇 |
2017年 | 267篇 |
2016年 | 351篇 |
2015年 | 293篇 |
2014年 | 377篇 |
2013年 | 596篇 |
2012年 | 534篇 |
2011年 | 717篇 |
2010年 | 506篇 |
2009年 | 475篇 |
2008年 | 484篇 |
2007年 | 424篇 |
2006年 | 379篇 |
2005年 | 305篇 |
2004年 | 253篇 |
2003年 | 186篇 |
2002年 | 165篇 |
2001年 | 102篇 |
2000年 | 96篇 |
1999年 | 114篇 |
1998年 | 124篇 |
1997年 | 96篇 |
1996年 | 86篇 |
1995年 | 52篇 |
1994年 | 59篇 |
1993年 | 37篇 |
1992年 | 47篇 |
1991年 | 26篇 |
1990年 | 40篇 |
1989年 | 23篇 |
1988年 | 28篇 |
1987年 | 27篇 |
1986年 | 23篇 |
1985年 | 20篇 |
1984年 | 29篇 |
1983年 | 17篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 20篇 |
1978年 | 12篇 |
1977年 | 16篇 |
1976年 | 26篇 |
1975年 | 13篇 |
1969年 | 11篇 |
排序方式: 共有8859条查询结果,搜索用时 0 毫秒
11.
The present study evaluated the reliability and validity of the Triage Assessment Survey: Organizations (TAS:O), a 27-item, 5-point, Likert summated rating scale. One hundred and seventeen participants responded to the TAS:O after reading mild, moderate, marked and severe organizational crisis scenarios. The overall Cronbach's alpha and split-half reliability were both .93. Confirmatory factor analysis revealed three factors, supporting the hypothesis that the TAS:O is comprised of three distinct factors (i.e., Affect, Behavior, and Cognition). An analysis of variance provided evidence that the TAS:O has the capacity to distinguish among mild, moderate, marked, and severe crises. Because this research is the first to evaluate the TAS:O, further studies are needed to strengthen confidence in the psychometric properties of this scale. 相似文献
12.
13.
14.
Christian Azar 《Energy》1994,19(12):1255-1261
Haraden's model for estimating the economic cost of global warming is analysed. We change his method of discounting and some of his input parameters in a manner consistent with physical and economic theory as well as empirical data. We then find much higher costs than Haraden found. These costs are compared to the cost of reducing CO2 emissions and we find that deep cuts of the emissions of CO2 are preferable. A check of the sensitivity of our results with respect to some crucial parameter values does not alter that conclusion. 相似文献
15.
16.
Demonstrative Suffering: The Gestural (Re)embodiment of Symptoms 总被引:1,自引:0,他引:1
Christian Heath 《The Journal of communication》2002,52(3):597-616
Despite the long-standing interest in emotion and bodily conduct, there remains relatively little research concerned with how gestures are used with talk and within interaction to reveal emotional and personal experience. In this article, the author considers the medical consultation and, in particular, the ways in which patients attempt to reveal their experience of illness to the doctor. The paper examines how gesture and other forms of bodily conduct are used to transform symptoms into suffering; to display, enact, and (re)embody medical problems and difficulties. The analysis is based on videorecordings of primary health care consultations and focuses on the social and interactional organization of demonstrative suffering. 相似文献
17.
18.
We consider a system defined as the product of a finite set of periodic systems on cyclic groups. It is of interest to determine if certain subgroups and unions of subgroups of the state set are reachable from a specified initial state, and in particular to determine the computational complexity of verifying such reachability. These questions are motivated by certain problems that arise in the modelling and control of discrete event systems and certain forms of periodic scheduling. Our main result is that deciding whether or not the union of a certain set of subgroups is reachable or not is NP-complete. 相似文献
19.
Hartouni E.P. Jensen D.A. Klima B. Kreisler M.N. Rabin M.S.Z. Uribe J. Church M. Gara A. Gottschalk E. Hylton R. Knapp B.C. Sippach F.W. Stern B. Wiencke L. Christian D. Gutierrez G. Holmes S.D. Strait J.B. Wehmann A. Avilez C. Correa W. Rosales A. Forbush M. Huson F.R. White J. 《IEEE transactions on nuclear science》1989,36(5):1480-1484
A novel technique for both online and offline computation is presented. With this technique, a reconstruction analysis in elementary particle physics, otherwise prohibitively long, has been accomplished. It will be used online in an upcoming Fermilab experiment to reconstruct more than 100000 events per second and to trigger on the basis of that information. The technique delivers 40 gigaoperations per second, has a bandwidth on the order of gigabytes per second, and has a modest cost. An overview of the program, details of the system, and performance measurements are presented 相似文献
20.