全文获取类型
收费全文 | 10932篇 |
免费 | 432篇 |
国内免费 | 189篇 |
专业分类
电工技术 | 577篇 |
综合类 | 792篇 |
化学工业 | 533篇 |
金属工艺 | 132篇 |
机械仪表 | 405篇 |
建筑科学 | 2695篇 |
矿业工程 | 710篇 |
能源动力 | 278篇 |
轻工业 | 742篇 |
水利工程 | 599篇 |
石油天然气 | 474篇 |
武器工业 | 66篇 |
无线电 | 368篇 |
一般工业技术 | 1144篇 |
冶金工业 | 486篇 |
原子能技术 | 322篇 |
自动化技术 | 1230篇 |
出版年
2024年 | 60篇 |
2023年 | 87篇 |
2022年 | 325篇 |
2021年 | 239篇 |
2020年 | 218篇 |
2019年 | 161篇 |
2018年 | 144篇 |
2017年 | 163篇 |
2016年 | 243篇 |
2015年 | 293篇 |
2014年 | 834篇 |
2013年 | 528篇 |
2012年 | 720篇 |
2011年 | 807篇 |
2010年 | 771篇 |
2009年 | 742篇 |
2008年 | 687篇 |
2007年 | 790篇 |
2006年 | 667篇 |
2005年 | 567篇 |
2004年 | 518篇 |
2003年 | 443篇 |
2002年 | 372篇 |
2001年 | 272篇 |
2000年 | 231篇 |
1999年 | 184篇 |
1998年 | 102篇 |
1997年 | 86篇 |
1996年 | 67篇 |
1995年 | 52篇 |
1994年 | 42篇 |
1993年 | 26篇 |
1992年 | 20篇 |
1991年 | 12篇 |
1990年 | 19篇 |
1989年 | 18篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 10篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1981年 | 1篇 |
1980年 | 4篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1960年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
102.
从串扰的角度分析了在1650V直流高压馈电杆上共杆架设通信电缆线路的可行性,并介绍了实验中所采取的安全措施。 相似文献
103.
We examined accident under-reporting with data from 425 employees employed in 5 industries with above average risk for employee injuries. We expected that rates for unreported accidents would be higher than rates for reported accidents; and that organizational safety climate and perceptions of supervisor enforcement of safety policies would moderate the relationship between unreported accidents and reported accidents. Results showed that the number of unreported accidents was significantly higher than the number of reported accidents. There was an average of 2.48 unreported accidents for every accident reported to the organization. Further, under-reporting was higher in working environments with poorer organizational safety climate or where supervisor safety enforcement was inconsistent. We discuss the implications of these findings for improving accident under-reporting and occupational safety in the workplace. 相似文献
104.
The present study is concerned with the human factors that contribute to violations in aviation maintenance. Much of our previous research in this area has been based on safety climate surveys and the analysis of relations among core dimensions of climate. In this study, we tap into mainstream psychological theory to help clarify the mechanisms underlying the links between climate and behavior. Specifically, we demonstrate the usefulness of Ajzen's (1991, 2001) Theory of Planned Behavior (TPB) to understanding violation behaviors in aircraft maintenance. A questionnaire was administered to 307 aircraft maintenance workers. Constructs measured by the survey included perceptions of management attitudes to safety, own attitudes to violations, intention to violate, group norms, workplace pressures, and violations. A model based on the TPB illustrated hypothetical connections among these variables. Path analyses using AMOS suggested some theoretically justifiable modifications to the model. Fit statistics of the revised model were excellent with intentions, group norms, and personal attitudes combining to explain 50% of the variance in self-reported violations. The model highlighted the importance of management attitudes and group norms as direct and indirect predictors of violation behavior. We conclude that the TPB is a useful tool for understanding the psychological background to the procedural violations so often associated with incidents and accidents. 相似文献
105.
106.
A key theme in safety is the investigation and improvement of work processes and conditions. This is built on a tradition of studying accidents, but there is growing interest in the investigation of everyday work. Researchers have started using terms such as success, normal and everyday work investigations, but behind these can be different activities. This paper makes explicit some considerations behind investigations of everyday work, how these considerations shape an investigation, and how they reflect different schools of thought. These considerations can be used as an aid for designing everyday work investigations for safety and serve as a first step towards critical reflection on investigating everyday work. 相似文献
107.
108.
109.
110.
分析了畜禽在收购、贩运和屠宰环节可能存在的安全隐患,介绍了国内外相关法律法规和实际运用的监控手段,提出了加强收购、贩运和屠宰环节的畜禽质量安全的监控建议. 相似文献