全文获取类型
收费全文 | 9684篇 |
免费 | 502篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 124篇 |
综合类 | 26篇 |
化学工业 | 2476篇 |
金属工艺 | 267篇 |
机械仪表 | 172篇 |
建筑科学 | 671篇 |
矿业工程 | 99篇 |
能源动力 | 300篇 |
轻工业 | 698篇 |
水利工程 | 58篇 |
石油天然气 | 20篇 |
武器工业 | 1篇 |
无线电 | 732篇 |
一般工业技术 | 1892篇 |
冶金工业 | 918篇 |
原子能技术 | 55篇 |
自动化技术 | 1685篇 |
出版年
2023年 | 123篇 |
2022年 | 224篇 |
2021年 | 348篇 |
2020年 | 207篇 |
2019年 | 217篇 |
2018年 | 237篇 |
2017年 | 274篇 |
2016年 | 368篇 |
2015年 | 308篇 |
2014年 | 392篇 |
2013年 | 634篇 |
2012年 | 564篇 |
2011年 | 749篇 |
2010年 | 545篇 |
2009年 | 506篇 |
2008年 | 515篇 |
2007年 | 458篇 |
2006年 | 417篇 |
2005年 | 326篇 |
2004年 | 276篇 |
2003年 | 209篇 |
2002年 | 197篇 |
2001年 | 130篇 |
2000年 | 111篇 |
1999年 | 140篇 |
1998年 | 247篇 |
1997年 | 178篇 |
1996年 | 139篇 |
1995年 | 95篇 |
1994年 | 105篇 |
1993年 | 81篇 |
1992年 | 70篇 |
1991年 | 46篇 |
1990年 | 53篇 |
1989年 | 38篇 |
1988年 | 39篇 |
1987年 | 45篇 |
1986年 | 40篇 |
1985年 | 40篇 |
1984年 | 52篇 |
1983年 | 33篇 |
1982年 | 29篇 |
1981年 | 30篇 |
1980年 | 33篇 |
1978年 | 20篇 |
1977年 | 33篇 |
1976年 | 52篇 |
1975年 | 32篇 |
1971年 | 19篇 |
1970年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
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
22.
23.
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
24.
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
25.
26.
This paper describes how SWoRD (scaffolded writing and rewriting in the discipline), a web-based reciprocal peer review system, supports writing practice, particularly for large content courses in which writing is considered critical but not feasibly included. To help students gain content knowledge as well as writing and reviewing skills, SWoRD supports the whole cycle of writing, reviews, back-reviews, and rewriting by scaffolding the journal publication process as its authentic practice model. In addition, SWoRD includes algorithms that compute individual reviewer’s review accuracy, which is in turn used to support the various drawbacks of reciprocal peer reviews (e.g., variation in motivation or ability of reviewers). Finally, this paper describes an empirical evaluation showing that the SWoRD approach is effective in improving writing quality in content classes. 相似文献
27.
28.
Christian Jennifer L.; O'Leary K. Daniel; Vivian Dina 《Canadian Metallurgical Quarterly》1994,8(1):32
Marital discord and depressive symptomatology have repeatedly been found to be associated, but little is known about variables that influence this relationship. Data were collected from 139 couples seeking marital therapy, and analyses were conducted separately by gender. For wives, lower problem-solving ability, physical aggression by the partner, and 1 relationship belief predicted depressive symptomatology after the variance due to marital discord was removed in regression analyses. In addition to these predictors, less spouse-specific assertiveness, unemployment, and 1 other relationship belief were associated with depressive symptomatology for women after the variance due to marital discord was removed in partial correlation analyses. For men, only lower problem-solving ability added to the prediction of depressive symptomatology. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
29.
30.