全文获取类型
收费全文 | 25379篇 |
免费 | 2760篇 |
国内免费 | 1076篇 |
专业分类
电工技术 | 1838篇 |
技术理论 | 4篇 |
综合类 | 2335篇 |
化学工业 | 1289篇 |
金属工艺 | 340篇 |
机械仪表 | 830篇 |
建筑科学 | 3850篇 |
矿业工程 | 830篇 |
能源动力 | 1181篇 |
轻工业 | 3655篇 |
水利工程 | 2017篇 |
石油天然气 | 756篇 |
武器工业 | 361篇 |
无线电 | 1212篇 |
一般工业技术 | 2038篇 |
冶金工业 | 2662篇 |
原子能技术 | 375篇 |
自动化技术 | 3642篇 |
出版年
2024年 | 177篇 |
2023年 | 528篇 |
2022年 | 927篇 |
2021年 | 1164篇 |
2020年 | 1118篇 |
2019年 | 955篇 |
2018年 | 903篇 |
2017年 | 980篇 |
2016年 | 1211篇 |
2015年 | 1073篇 |
2014年 | 1704篇 |
2013年 | 2061篇 |
2012年 | 1708篇 |
2011年 | 2078篇 |
2010年 | 1546篇 |
2009年 | 1456篇 |
2008年 | 1375篇 |
2007年 | 1470篇 |
2006年 | 1406篇 |
2005年 | 1146篇 |
2004年 | 867篇 |
2003年 | 705篇 |
2002年 | 578篇 |
2001年 | 400篇 |
2000年 | 266篇 |
1999年 | 214篇 |
1998年 | 170篇 |
1997年 | 123篇 |
1996年 | 124篇 |
1995年 | 88篇 |
1994年 | 81篇 |
1993年 | 63篇 |
1992年 | 39篇 |
1991年 | 32篇 |
1990年 | 45篇 |
1989年 | 42篇 |
1988年 | 48篇 |
1987年 | 31篇 |
1986年 | 28篇 |
1985年 | 23篇 |
1984年 | 25篇 |
1983年 | 22篇 |
1982年 | 24篇 |
1981年 | 13篇 |
1980年 | 20篇 |
1979年 | 11篇 |
1966年 | 11篇 |
1965年 | 18篇 |
1963年 | 12篇 |
1958年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
151.
152.
153.
随着信息化进程的快速发展,保障信息系统的安全性和降低信息系统潜在的风险,一直是国内外学者关注的焦点,而风险评估正是解决该问题的有效方法之一,但是在风险评估过程中存在评估指标难以量化、风险值难以界定等困难,因此文章提出了一种基于灰色关联分析的信息安全风险评估方法,该方法首先建立了信息系统的风险评估指标体系,其次将评估的信息系统与最优信息系统进行关联度分析,最后得出信息系统风险的准确度量。该方法可以使信息系统的评估过程简单化,标准化。 相似文献
154.
155.
Weige Lu Haisong Xu M. Ronnier Luo 《Journal of the Society for Information Display》2012,20(5):259-265
Abstract— A psychophysical experiment was carried out to assess the perceptual contrast on a large‐sized liquid‐crystal display (LCD) under nine phases of viewing conditions. Based on the results, six contrast models employing different color attributes or the index of just‐noticeable difference (JND) were developed. Their performances were also tested by the visual data of the nine phases, which indicated that the model CQ employing CIECAM02 brightness gives the best performance in predicting visual data under different viewing conditions among those models. A preprocessing step was also proposed to utilize the contrast model CQ conveniently in the practical contrast evaluation of LCDs. 相似文献
156.
Randy V. Bradley Renée M. E. Pratt Terry Anthony Byrd Christina N. Outlay Donald E. Wynn Jr. 《Information Systems Journal》2012,22(2):97-127
Despite the possible benefits of implementing healthcare information technologies, successful implementation of effective healthcare information technology is constrained by cultural and regulatory concerns and technical obstacles encountered when establishing or upgrading an organisation's enterprise infrastructure. In this paper, we advance Ross' four‐stage model of enterprise architecture maturity as a valuable IT resource for helping healthcare organisations sustain a competitive advantage. We use partial least squares (PLS) structural equation modelling to analyse survey data from 164 US hospitals at different stages of EA maturity. Our results provide evidence that enterprise architecture maturity directly influences the effectiveness of hospitals' IT resources for achieving strategic goals. Further, enterprise architecture maturity indirectly influences the effectiveness of IT resources when IT alignment is incorporated as a mediating variable. We discuss the implications of our findings for research and practice and suggest opportunities for future research. 相似文献
157.
Kirwan B 《Applied ergonomics》1992,23(6):371-381
This is the second part of a two-part review of human error identification (HEI) approaches in human reliability assessment (HRA). Part 1 reviewed the probabilistic risk assessment (PRA) context in which HRA occurs, and then detailed 12 HEI techniques which have evolved in the field of HRA. Part 2 attempts to compare the way these techniques perform against a range of criteria relevant to HEI theoretical and empirical validity, and practical usefulness in applied HRA. It is hoped that these comparisons will help assessors in the selection of techniques for practical applications. The comparisons also point to research and development needs in the area of applied HEI. 相似文献
158.
Notes that 7 of the 10 top-cited articles in the Psychological Bulletin deal with methodological topics. One of these is the P. M. Bentler and D. G. Bonett (1980) article on the assessment of fit in covariance structure models. Some context is provided on the popularity of this article. In addition, a citation study of methodology articles appearing in the Bulletin since 1978 was carried out. It verified that publications in design, evaluation, measurement, and statistics continue to be important to psychological research. Some thoughts are offered on the role of the journal in making developments in these areas more accessible to psychologists. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
159.
160.
本文采取问卷调查和文献查阅相结合的方式,对黄冈市卫生专业技术人员队伍现状进行了调查和分析,剖析了黄冈市农村卫生人才培养的方法和经验,提出了切实可行的农村卫生人才培养的对策与建议。 相似文献