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   998篇
  免费   4篇
  国内免费   23篇
教育   562篇
科学研究   235篇
各国文化   7篇
体育   98篇
综合类   39篇
信息传播   84篇
  2023年   4篇
  2022年   7篇
  2021年   12篇
  2020年   16篇
  2019年   17篇
  2018年   16篇
  2017年   12篇
  2016年   15篇
  2015年   42篇
  2014年   67篇
  2013年   108篇
  2012年   74篇
  2011年   81篇
  2010年   50篇
  2009年   70篇
  2008年   83篇
  2007年   75篇
  2006年   74篇
  2005年   51篇
  2004年   37篇
  2003年   22篇
  2002年   22篇
  2001年   20篇
  2000年   8篇
  1999年   14篇
  1998年   10篇
  1997年   4篇
  1995年   1篇
  1994年   4篇
  1993年   1篇
  1992年   2篇
  1990年   1篇
  1989年   1篇
  1988年   1篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
排序方式: 共有1025条查询结果,搜索用时 15 毫秒
41.
本文针对当前机房管理系统存在的不足,设计开发了一套电信机房综合管控系统软件,并构建了统一的网维机房综合监管平台。该系统可实现机房合同以及缴费数据等信息的自动化管理;提供能耗分析手段,为机房能耗改造提供依据;制定巡检模板和巡检流程,为代维人员制订明确的巡检任务要求,为考核代维人员提供明确的依据。  相似文献   
42.
阐述动力传动系扭振分析的三种方法(理论分析、试验测试以及 CAE 仿真),并分析微车 FR 型动力传动系扭振特性。在此基础上,从动力学参数优化和附加减、隔振装置两方面总结动力传动系扭振控制方法,具体包括动力学参数对传动系固有特性和扭振响应的影响分析和TVD、CTD、DMF、STD的优缺点对比以及工程应用现状讨论。  相似文献   
43.
邓其宽 《大众科技》2014,(4):69-70,79
供电稳定可靠是自来水厂正常生产的关键。提升水厂供电可靠性可从以下几方面考虑:供电回路设计,母线设计,用电设备的技术水平与质量水平,管理制度与操作规程等。文章从这几方面论述如何提升水厂的供电可靠性。  相似文献   
44.
Machine learning applications must continually utilize label information from the data stream to detect concept drift and adapt to the dynamic behavior. Due to the computational expensiveness of label information, it is impractical to assume that the data stream is fully labeled. Therefore, much research focusing on semi-supervised concept drift detection has been proposed. Despite the large research effort in the literature, there is a lack of analysis on the information resources required with the achievable concept drift detection accuracy. Hence, this paper aims to answer the unexplored research question of “How many labeled samples are required to detect concept drift accurately?” by proposing an analytical framework to analyze and estimate the information resources required to detect concept drift accurately. Specifically, this paper disintegrates the distribution-based concept drift detection task into a learning task and a dissimilarity measurement task for independent analyses. The analyses results are then correlated to estimate the required number of labels within a set of data samples to detect concept drift accurately. The proximity of the information resources estimation is evaluated empirically, where the results suggest that the estimation is accurate with high amount of information resources provided. Additionally, estimation results of a state-of-the-art method and a benchmark data set are reported to show the applicability of the estimation by proposed analytical framework within benchmarked environments. In general, the estimation from the proposed analytical framework can serve as guidance in designing systems with limited information resources. This paper also hopes to assist in identifying research gaps and inspiring new research ideas regarding the analysis of the amount of information resources required for accurate concept drift detection.  相似文献   
45.
Recent evidence indicates that decision makers are more sensitive to potential losses than gains. Loss aversion psychology has led behavioural economists to look beyond expected utility by developing prospect theory. We demonstrate this theory using the Deal or No Deal game show.  相似文献   
46.
关于高校体育教学改革的实践探索   总被引:1,自引:0,他引:1  
本文以宁波高等专科学校的在校生为研究对象,以不同性别的男女学生对参加体育活动的动机类型为研究内容,探究高校体育在贯彻《全民健身计划纲要》中的现实意义和时代价值。  相似文献   
47.
Three emotion work themes were displayed in the discourse of individuals who lost their jobs and of their family members. Foregrounding-backgrounding of emotions indicated not only how some individuals and family members exerted effort to express positive emotions, but also why they would do so (for deep authenticity). In the construction of normalcy, respondents made an effort to portray and enact their lives as similar to the way things were before the job loss. By (re)instituting traditional masculinities, the men who lost their jobs were able to be "real" men in an emasculating situation. Taken together, these findings offer possibilities for further theoretical development and for communication interventions that can be applied by human resource professionals, career and outplacement counselors, family members, friends, and the individuals themselves.  相似文献   
48.
郭辉 《常熟理工学院学报》2006,20(6):98-101,116
分析了实地实践教学模式的缺点,设计开发了针对电气类专业的面向WEB电网仿真系统的架构,介绍了其在电力实习教学中的应用,弥补了电力实习教学实地实习的不足。  相似文献   
49.
科研体制中的权力维度   总被引:2,自引:0,他引:2  
徐杰 《科研管理》2002,23(2):1-4
本文通过分析发展科研能力的必要性,提出高校和基金会制中,按一定规则赋予科研人员或科研组织一定的行政权力是促进科学发展的重要因素,  相似文献   
50.
This paper deals with fractional calculus and its approximate discretization. Two direct discretization methods useful in control and digital filtering are presented for discretizing the fractional-order differentiator or integrator. Detailed mathematical formulae and tables are given. An illustrative example is presented to show the practically usefulness of the two proposed discretization schemes. Comparative remarks between the two methods are also given.  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