全文获取类型
收费全文 | 1750篇 |
免费 | 40篇 |
国内免费 | 19篇 |
专业分类
电工技术 | 83篇 |
综合类 | 56篇 |
化学工业 | 70篇 |
金属工艺 | 59篇 |
机械仪表 | 235篇 |
建筑科学 | 236篇 |
矿业工程 | 49篇 |
能源动力 | 36篇 |
轻工业 | 29篇 |
水利工程 | 15篇 |
石油天然气 | 34篇 |
武器工业 | 33篇 |
无线电 | 98篇 |
一般工业技术 | 182篇 |
冶金工业 | 94篇 |
原子能技术 | 40篇 |
自动化技术 | 460篇 |
出版年
2023年 | 9篇 |
2022年 | 16篇 |
2021年 | 26篇 |
2020年 | 33篇 |
2019年 | 16篇 |
2018年 | 19篇 |
2017年 | 21篇 |
2016年 | 35篇 |
2015年 | 46篇 |
2014年 | 111篇 |
2013年 | 142篇 |
2012年 | 116篇 |
2011年 | 178篇 |
2010年 | 104篇 |
2009年 | 115篇 |
2008年 | 86篇 |
2007年 | 108篇 |
2006年 | 121篇 |
2005年 | 95篇 |
2004年 | 65篇 |
2003年 | 78篇 |
2002年 | 55篇 |
2001年 | 36篇 |
2000年 | 27篇 |
1999年 | 41篇 |
1998年 | 24篇 |
1997年 | 14篇 |
1996年 | 15篇 |
1995年 | 14篇 |
1994年 | 9篇 |
1993年 | 7篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有1809条查询结果,搜索用时 15 毫秒
31.
为了实现对某型测试设备中数字电路板的快速准确检测,提高装备的维护保障能力,设计了一种基于Labwindows/CVI的数字电路板检测系统。该检测系统软件采用Labwindows/CVI作为开发平台,能够实现装备中的数字电路板的功能验证与故障诊断测试,能够满足内外场数字电路板卡快速检测和故障诊断的需要。实际应用表明,该系统具有检测准确、故障信息准确率高、稳定可靠、操作方便的特点,该系统的应用提高了装备的维修保障能力。 相似文献
32.
33.
王银锁 《自动化与仪器仪表》2013,(6):86-87
介绍了电磁流量计的工作原理,电磁流量计的精度、口径和传感器绝缘衬里选择;一体电磁流量计和分体式电磁流量计的安装;电磁流量计在使用过程中故障现象和处理方法。 相似文献
34.
35.
36.
Abstract This paper describes a system for explaining solutions generated by genetic algorithms (GAs) using tools developed for case-based reasoning (CBR). In addition, this work empirically supports the building block hypothesis (BBH) which states that genetic algorithms work by combining good sub-solutions called building blocks into complete solutions. Since the space of possible building blocks and their combinations is extremely large, solutions found by GAs are often opaque and cannot be easily explained. Ironically, much of the knowledge required to explain such solutions is implicit in the processing done by the GA. Our system extracts and processes historical information from the GA by using knowledge acquisition and analysis tools developed for case-based reasoning. If properly analysed, the resulting knowledge base can be used: to shed light on the nature of the search space; to explain how a solution evolved; to discover its building blocks; and to justify why it works. Such knowledge about the search space can be used to tune the GA in various ways. As well as being a useful explanatory tool for GA researchers, our system serves as an empirical test of the building block hypothesis. The fact that it works so well lends credence to the theory that GAs work by exploiting common genetic building blocks. 相似文献
37.
《Ergonomics》2012,55(12):866-882
Road safety studies using the Driver Behaviour Questionnaire (DBQ) have provided support for a three-way distinction between violations, skill-based errors and mistakes, and have indicated that a tendency to commit driving violations is associated with an increased risk of accident involvement. The aims of this study were to examine whether the three-way distinction of unsafe acts is applicable in the context of aircraft maintenance, and whether involvement in maintenance safety occurrences can be predicted on the basis of self-reported unsafe acts. A Maintenance Behaviour Questionnaire (MBQ) was developed to explore patterns of unsafe acts committed by aircraft maintenance mechanics. The MBQ was completed anonymously by over 1300 Australian aviation mechanics, who also provided information on their involvement in workplace accidents and incidents. Four factors were identified: routine violations, skill-based errors, mistakes and exceptional violations. Violations and mistakes were related significantly to the occurrence of incidents that jeopardized the quality of aircraft maintenance, but were not related to workplace injuries. Skill-based errors, while not related to work quality incidents, were related to workplace injuries. The results are consistent with the three-way typology of unsafe acts described by Reason et al. (1990) and with the DBQ research indicating an association between self-reported violations and accidents. The current findings suggest that interventions addressed at maintenance quality incidents should take into account the role of violations and mistakes, and the factors that promote them. In contrast, interventions directed at reducing workplace injury are likely to require a focus on skill-based errors. 相似文献
38.
可编程控制器(PLC)控制系统具有工作稳定、可靠,便于维护,具有价格便宜、控制灵活方便等特点,被广泛应用于各行各业的自动控制系统中。介绍了可编程控制器的控制原理以及其在中央空调制冷系统控制中的应用,并对控制系统故障的检查与维修等相关技术进行了探讨。 相似文献
39.
航管一次雷达维修测试平台是在国产航管一次雷达基础上,具有设备维修、维护、软件升级、雷达模拟、人员培训等功能,以满足技术保障人员对雷达设备维护、维修的要求。该测试平台按照功能可化分为维修参考系统、维修测试工装和维修测试软件等。本文叙述了航管一次雷达维修测试平台的设计原理和系统组成。 相似文献
40.
分析了微电子与微组装工艺的发展趋势,论述了21世纪电子整机制造缺陷的消除技术,探讨未来高技术高密度高效能小体积电子整机的维修问题,提出21世纪电子整机维修性的科研方向。 相似文献