首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   326篇
  免费   14篇
  国内免费   9篇
电工技术   14篇
综合类   35篇
化学工业   40篇
金属工艺   5篇
机械仪表   14篇
建筑科学   72篇
矿业工程   14篇
能源动力   9篇
轻工业   29篇
水利工程   8篇
石油天然气   14篇
无线电   10篇
一般工业技术   9篇
冶金工业   26篇
原子能技术   1篇
自动化技术   49篇
  2023年   1篇
  2022年   6篇
  2021年   4篇
  2020年   4篇
  2019年   5篇
  2018年   1篇
  2017年   7篇
  2016年   7篇
  2015年   14篇
  2014年   43篇
  2013年   10篇
  2012年   10篇
  2011年   21篇
  2010年   26篇
  2009年   25篇
  2008年   20篇
  2007年   22篇
  2006年   23篇
  2005年   17篇
  2004年   24篇
  2003年   19篇
  2002年   11篇
  2001年   8篇
  2000年   7篇
  1999年   1篇
  1998年   1篇
  1996年   4篇
  1994年   2篇
  1990年   1篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1982年   1篇
  1965年   1篇
排序方式: 共有349条查询结果,搜索用时 265 毫秒
1.
针对有些加油站在采用外接电源的同时配备发电机组存在的诸如使加油站安全要求提高、设备投入费用增加、运营管理成本增加、发电机组使用效率低和安全隐患增加等问题,建议本着经济的原则,在缺电少电比较严重的地区或引用外接电源有困难的加油站可另外设置发电机组,对遇偶然性停电的加油站,应采用在市场上临时租赁移动发动机业务或由公司组建自己的移动式发电机组服务部门,以保证加油站应急用电需求。  相似文献   
2.
响洪甸水库大坝被评定为三类坝,其最主要原因是该库的防洪能力不足、大坝坝基扬压力过高和F2断层难以确定,严重影响大坝的安全稳定.本文主要对坝基扬压力过高的探查试验情况进行介绍,对产生的原因进行分析,并提出了处理方案的设想.  相似文献   
3.
介绍了浙江省利用废纸造纸的情况,提出改进废纸利用的意见。  相似文献   
4.
分析了建筑陶瓷企业实施精益生产的条件和当前推行精益生产的主要障碍,对应用中存在的问题进行了分析并提出了相关建议。  相似文献   
5.
论述了我国石油和化学工业“五大六低”的矛盾,即:产量大,企业数量大,职工队伍大,资源与能源消耗大,环境污染大;劳动生产率低,集约化程度低,科技含量低,石油和化学品性能低,市场应变能力低,经济效益低的矛盾。现状决定了石化工业必须加快循环经济的发展,提出了推动我国石油和化学工业走循环经济之路必须采取的对策和建议。  相似文献   
6.
This paper resolves the problem of predicting as well as the best expert up to an additive term of the order o(n), where n is the length of a sequence of letters from a finite alphabet. We call the games that permit this weakly mixable and give a geometrical characterisation of the class of weakly mixable games. Weak mixability turns out to be equivalent to convexity of the finite part of the set of superpredictions. For bounded games we introduce the Weak Aggregating Algorithm that allows us to obtain additive terms of the form .  相似文献   
7.
Fraigniaud et al. [L. Blin, P. Fraigniaud, N. Nisse, S. Vial, Distributing chasing of network intruders, in: 13th Colloquium on Structural Information and Communication Complexity, SIROCCO, in: LNCS, vol. 4056, Springer-Verlag, 2006, pp. 70–84] introduced a new measure of difficulty for a distributed task in a network. The smallest number of bits of advice   of a distributed problem is the smallest number of bits of information that has to be available to nodes in order to accomplish the task efficiently. Our paper deals with the number of bits of advice required to perform efficiently the graph searching problem in a distributed setting. In this variant of the problem, all searchers are initially placed at a particular node of the network. The aim of the team of searchers is to clear a contaminated graph in a monotone connected way, i.e., the cleared part of the graph is permanently connected, and never decreases while the search strategy is executed. Moreover, the clearing of the graph must be performed using the optimal number of searchers, i.e. the minimum number of searchers sufficient to clear the graph in a monotone connected way in a centralized setting. We show that the minimum number of bits of advice permitting the monotone connected and optimal clearing of a network in a distributed setting is Θ(nlogn)Θ(nlogn), where nn is the number of nodes of the network. More precisely, we first provide a labelling of the vertices of any graph GG, using a total of O(nlogn)O(nlogn) bits, and a protocol using this labelling that enables the optimal number of searchers to clear GG in a monotone connected distributed way. Then, we show that this number of bits of advice is optimal: any distributed protocol requires Ω(nlogn)Ω(nlogn) bits of advice to clear a network in a monotone connected way, using an optimal number of searchers.  相似文献   
8.
A range of responsible gambling systems have been developed, but they are not necessarily used by consumers. This requires an understanding of factors (e.g. risk and loss) influencing response to advice. Therefore, an experiment examined the use of decisional support in response to induced success or failure. A total of 21 university students played computer Blackjack at two levels of risk, and were informed as to whether the odds were in their favour (‘card count’), and were given online advice as to card selection (Basic). Winning streaks led to overconfidence, as indicated by larger mean bets, more Basic errors, and a failure to adjust wagering upon cessation of the winning streak. Participants were more cautious in response to losses, betting less, and were more likely to comply with advice. Participants attended and complied with advice earlier at low risk, but at high risk noticed advice later and did not comply. Induced emotional states (e.g. winning or losing) are important as they influence the likelihood that people will listen to online advice. Designers of Behaviour Change Support Systems should consider methods of contingently implementing advice.  相似文献   
9.
The Technology Acceptance Model (TAM) has been considered to be fundamental in determining the acceptance of new technology in the past decades. The two beliefs, ease of use and usefulness, in the model may not, however, fully explain the consumers’ behavior in an emerging environment, such as mobile commerce (m-commerce). This paper aims to develop a framework for m-commerce adoption in consumer decision-making processes. In this paper TAM has been adopted and extended to analyze successful m-commerce adoption. The key elements of the proposed confidence-based framework for B2C m-commerce adoption include psychological and behavioral factors. Psychological factors include history-based confidence, institution-based confidence and personality-based confidence. Behavioral factors include perceived ease of use and perceived usefulness of the mobile application and technology.  相似文献   
10.
日本综合商社是一种有日本特色的集贸易、投资、金融及信息等为一体的跨国公司,它的商业模式对日本经济的发展起到了至关重要的作用.分析了日本综合商社商业模式的特点,阐述了综合商社在发展国际投资和贸易中的作用以及来自金融危机和服务外包的挑战,从三个方面提出了对我国在扩大对外投资贸易中的政策建议,以提高我国对外投资贸易中的国际竞争力.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号