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   17790篇
  免费   31篇
财政金融   2802篇
工业经济   805篇
计划管理   2728篇
经济学   4133篇
综合类   484篇
运输经济   15篇
旅游经济   24篇
贸易经济   4715篇
农业经济   57篇
经济概况   1400篇
信息产业经济   44篇
邮电经济   614篇
  2024年   2篇
  2023年   7篇
  2022年   7篇
  2021年   23篇
  2020年   29篇
  2019年   33篇
  2018年   2340篇
  2017年   2088篇
  2016年   1243篇
  2015年   114篇
  2014年   164篇
  2013年   169篇
  2012年   503篇
  2011年   2004篇
  2010年   1876篇
  2009年   1569篇
  2008年   1547篇
  2007年   1914篇
  2006年   113篇
  2005年   430篇
  2004年   485篇
  2003年   581篇
  2002年   276篇
  2001年   75篇
  2000年   67篇
  1999年   22篇
  1998年   25篇
  1997年   13篇
  1996年   17篇
  1995年   6篇
  1994年   5篇
  1993年   9篇
  1992年   6篇
  1991年   6篇
  1990年   3篇
  1989年   4篇
  1987年   3篇
  1986年   14篇
  1985年   2篇
  1984年   4篇
  1983年   4篇
  1982年   2篇
  1979年   2篇
  1978年   3篇
  1976年   2篇
  1971年   3篇
  1970年   1篇
  1967年   1篇
  1966年   1篇
  1931年   1篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
81.
In the second half of 2009, the entire media agenda in Germany was dominated by the swine flu, next to the German Federal Parliament elections. Criticism was voiced in the media against the pharmaceutical industry for lobbying the nationwide swine flu vaccination, which was widely considered nothing but a product of the industry’s lobbying power. In order to avoid the usual interviews with lobbyists, we attempted to apply a new methodological framework approach in analysing lobbying processes and key stakeholders in the public sphere—and outside. Crucial to the diversified approach, which involves quantitative content analysis of media coverage and press releases, are interviews with journalists, lobbyists’ network analysis and internet research on biographies. Although a conspiracy could not be conclusively proven, the results do indicate associations that validate the criticism of the industry’s lobbying activities.  相似文献   
82.
83.
84.
85.
86.
87.
88.
89.
When price-cap rules determine the structure of prices for a long period, they suffer a credibility problem and introduce an element of risk especially if a firm’s profits are “too large”. Profit sharing may be seen as a device to pre-determine price adjustments and thus to decrease regulatory risk. We analyse the effects of profit sharing on the incentives to invest, using a real option approach. Absent credibility issues, a well designed profit sharing system may be neutral relative to a pure price cap. With regulatory risk, profit sharing is preferable to a pure price-cap one, if it intervenes for high enough profit levels.
Carlo Scarpa (Corresponding author)Email:
  相似文献   
90.
Security of Big Data is a huge concern. In a broad sense, Big Data contains two types of data: structured and unstructured. Providing security to unstructured data is more difficult than providing security to structured data. In this paper, we have developed an approach to provide adequate security to unstructured data by considering types of data and their sensitivity levels. We have reviewed the different analytics methods of Big Data to build nodes of different types of data. Each type of data has been classified to provide adequate security and enhance the overhead of the security system. To provide security to a data node, and a security suite has been designed by incorporating different security algorithms. Those security algorithms collectively form a security suite which has been interfaced with the data node. Information on data sensitivity has been collected through a survey. We have shown through several experiments on multiple computer systems with varied configurations that data classification with respect to sensitivity levels enhances the performance of the system. The experimental results show how and in what amount the designed security suite reduces overhead and increases security simultaneously.  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