全文获取类型
收费全文 | 2827篇 |
免费 | 406篇 |
国内免费 | 348篇 |
专业分类
电工技术 | 116篇 |
技术理论 | 1篇 |
综合类 | 323篇 |
化学工业 | 86篇 |
金属工艺 | 22篇 |
机械仪表 | 142篇 |
建筑科学 | 149篇 |
矿业工程 | 30篇 |
能源动力 | 27篇 |
轻工业 | 142篇 |
水利工程 | 56篇 |
石油天然气 | 11篇 |
武器工业 | 28篇 |
无线电 | 403篇 |
一般工业技术 | 186篇 |
冶金工业 | 512篇 |
原子能技术 | 14篇 |
自动化技术 | 1333篇 |
出版年
2024年 | 21篇 |
2023年 | 62篇 |
2022年 | 91篇 |
2021年 | 112篇 |
2020年 | 113篇 |
2019年 | 96篇 |
2018年 | 92篇 |
2017年 | 94篇 |
2016年 | 110篇 |
2015年 | 144篇 |
2014年 | 172篇 |
2013年 | 184篇 |
2012年 | 182篇 |
2011年 | 269篇 |
2010年 | 182篇 |
2009年 | 179篇 |
2008年 | 215篇 |
2007年 | 244篇 |
2006年 | 188篇 |
2005年 | 160篇 |
2004年 | 135篇 |
2003年 | 131篇 |
2002年 | 102篇 |
2001年 | 88篇 |
2000年 | 47篇 |
1999年 | 20篇 |
1998年 | 18篇 |
1997年 | 3篇 |
1996年 | 16篇 |
1995年 | 13篇 |
1994年 | 6篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1979年 | 3篇 |
1974年 | 2篇 |
1965年 | 5篇 |
1964年 | 3篇 |
1963年 | 8篇 |
1962年 | 3篇 |
1961年 | 3篇 |
1959年 | 5篇 |
1958年 | 3篇 |
1957年 | 2篇 |
1956年 | 3篇 |
1955年 | 6篇 |
排序方式: 共有3581条查询结果,搜索用时 15 毫秒
91.
门禁控制系统是现代化数字安防组成的重要方面,它可以应用在登记公司员工的出入,对陌生人来访进行监督。此外,门禁控制系统的唯一标示性,可以有效地对员工上下班出勤起到督促作用,加大和提高公司有限资源的整合利用度。文章通过均衡系统实际的数据传输速度和成本,运用两级网络控制器模式,以因特网网络控制器为基础,实现了分散式的无线射频识别数据网络互联,数据安全采用两层检测验证机制,从而完成了RFID门禁控制系统的设计。 相似文献
92.
李祥龙 《网络安全技术与应用》2013,(10):65-65,67
本文通过对策略冲突进行系统研究,找到其中的主要因素,按照“策略冲突发生时策略的状态”和“策略冲突发生时策略作用对象之间的关系”给出了策略冲突的两种分类,通过这两种分类解决了“何时检测冲突”和“如何检测冲突”的问题.而后进一步阐述了如何应用冲突数据库来判别策略冲突类型的方法. 相似文献
93.
Peter Stone 《Information & Communications Technology Law》2013,22(1):14-26
In a series of rulings given in the last few years, the Court of Justice of the European Union (EU) has made use of the concept of targeting by a trader of a particular territorial market as a device for determining the scope of European legislation on private law. The concept is of particular importance in the context of trading activities conducted by means of the Internet, though its significance is not confined to such activities. In particular, the European Court has used the concept of targeting for the purpose of restricting the substantive ambit of intellectual property rights created or harmonised by EU legislation. On the other hand, it has avoided use of the concept of targeting in the context of EU legislation allocating jurisdiction between the courts of the Member States, even in respect of disputes involving intellectual property, except where a legislative text specifically invokes such a concept. The instant paper endeavours to review the position as currently established by the European case-law, and to predict the likely further developments. 相似文献
94.
随着空中交通流量的增加,空中交通管理系统面临着越来越严重的航线拥挤问题.在自由飞行的环境下,发生冲突的可能性会大大增加,冲突解脱技术成为提高飞行安全与效益的一项关键技术.针对此问题,提出了一种改进的、能够快速准确进行航路规划的遗传算法,与标准遗传算法进行比较,取得了较好的优化效果. 相似文献
95.
分类是数据挖掘领域研究的核心技术之一,分类器性能评估方法也是众多学者的研究热点之一。以往的分类器性能评估方法一般针对于单标签数据集,对于多标签问题并未涉及。文中主要针对多标签分类问题中的单实例情况,提出了一种多标签分类器准确性评估方法(EMOSIML)。该方法的思路是:如果分类器对一个多标签对象预测的类别标签是其属于的多个类别标签中的任何一个,则分类结果都是正确的。该方法用C#编程实现,并对朴素贝叶斯分类器进行分类器性能评估实验,实验结果表明,EMOSIML评估方法较传统的准确率评估方法更合理。 相似文献
96.
随着嵌入式技术、现代通讯技术的发展以及新一代通讯标准的出现,使得人们使用大规模智能移动设备进行移动计算成为可能。本文针对移动应用提出了一种在物理隔离网络环境下的数据同步方法,介绍了应用的背景,对同步系统进行总体设计,详细说明了数据同步操作的步骤及过程,然后详细论述了同步过程中冲突的检测、处理规则。采用增量式的同步方法,减少了数据交互量;同时,内外网物理隔离,保证了数据的安全性。 相似文献
97.
98.
Lei Guo Xingwei Wang Qingyang Song Weigang Hou Fei Yang 《Information Sciences》2008,178(18):3635-3644
With the development of intelligent optical networks and the general multi-protocol label switching (GMPLS) technique, the seamless convergence between IP network and optical network is no longer be a dream but a practical reality. Similar to the Internet, current optical networks have been divided into multiple domains each of which has its own network provider and management policy. Therefore, the development of multi-domain optical networks will be the trend of new-generation intelligent optical networks, and GMPLS-based survivability for multi-domain optical networks will become a hot topic of research in the future. This paper provides a comprehensive review of the existing survivable schemes in multi-domain optical networks and analyzes the shortcomings of current research. Based on previous studies, we present possible challenges and propose new ideas to design efficient survivable schemes to guide the future work of researchers in multi-domain optical networks. 相似文献
99.
《Behaviour & Information Technology》2008,27(2):107-114
The number of organizations using teamwork is increasing. In this context, group potency has emerged as a key construct in group research. Moreover, in the last decades, information and communication technologies (ICT) have allowed organizations to form virtual teams. Consequently, a considerable amount of research has analysed the functioning of virtual teams. We focus on intragroup conflict as a relevant antecedent of potency in computer-mediated communication groups. Specifically, the aim of this research is to examine the role of ICT in the relationship between intragroup conflict and group potency in a longitudinal study. A laboratory experiment was carried out comparing 44 groups working in two communication media (face-to-face and computer-mediated communication). The groups developed a project over a one-month period. The results show that communication media play a moderator role between intragroup conflict (relationship and task conflict) and group potency. Implications of these results are discussed. 相似文献
100.
Organizations today face shortages of IT personnel. We investigated workplace factors in one state government in hope of identifying factors that influence perceived organizational support (POS) within an IT work environment. A combination of job characteristics (challenging job and perceived workload), job stressors (work exhaustion, role conflict, and role ambiguity), and the organization’s discretionary actions (pay-for-performance and mentoring opportunities) were measured and hierarchical regression was used to determine the relationships. Four control variables were also included (age, gender, organizational tenure, and professional versus administrator status). Role ambiguity, role conflict, work exhaustion, career mentoring, and pay-for-performance together explained 62% of the variance in the IT employees’ POS. Career mentoring and role ambiguity explained most of the variance. 相似文献