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   2061篇
  免费   28篇
  国内免费   4篇
教育   1477篇
科学研究   273篇
各国文化   24篇
体育   98篇
综合类   1篇
文化理论   34篇
信息传播   186篇
  2022年   12篇
  2021年   20篇
  2020年   31篇
  2019年   48篇
  2018年   64篇
  2017年   50篇
  2016年   47篇
  2015年   32篇
  2014年   39篇
  2013年   552篇
  2012年   42篇
  2011年   41篇
  2010年   31篇
  2009年   22篇
  2008年   41篇
  2007年   28篇
  2006年   29篇
  2005年   29篇
  2004年   33篇
  2003年   34篇
  2002年   32篇
  2001年   18篇
  2000年   24篇
  1999年   24篇
  1998年   18篇
  1997年   20篇
  1996年   24篇
  1995年   17篇
  1994年   12篇
  1993年   22篇
  1992年   19篇
  1991年   17篇
  1990年   17篇
  1989年   22篇
  1988年   14篇
  1987年   25篇
  1986年   14篇
  1984年   17篇
  1983年   16篇
  1982年   19篇
  1981年   20篇
  1980年   22篇
  1979年   19篇
  1978年   21篇
  1976年   14篇
  1974年   16篇
  1973年   12篇
  1972年   14篇
  1967年   14篇
  1966年   12篇
排序方式: 共有2093条查询结果,搜索用时 15 毫秒
1.
2.
The poor reading achievement of African-American children in urban schools is well established. African-American children from low-income homes may be at particular risk for reading difficulties, although middle-income children often fare poorly as well. Intervention efforts have focused on children in kindergarten through fifth grade. This article suggests that prevention efforts must begin prior to kindergarten entry. Several key variables that may influence young children's performance, including poverty, general oral language skills, dialectal variations, home literacy practices, standardized testing bias, and teacher expectations, are explored. Future directions for research addressing emergent literacy in African-American children are discussed throughout.  相似文献   
3.
4.
5.
6.
Governments worldwide are increasingly using Web-based business models to enhance their service delivery. Yet the concept of the business model is unexplored within the context of e-government. Drawing upon the literature on e-commerce, we develop a taxonomy for analyzing Web-based business models for e-government. Based on a systematic survey of 59 e-government Web sites in the Netherlands, our findings indicate that most of the Web sites use the content provider or direct-to-customer business models, while only a few are using novel business models. Overall, the concept of business model is appealing and useful in the public sector. Specifically it compliments research on Web site quality by analyzing and describing Web sites using atomic e-government business models and suggesting improvements by using combinations of business models.  相似文献   
7.
Academic libraries and consortia are spending the vast majority of their material budgets on digital content, including ebooks. A review of ebook preservation activities for the North American library consortia is provided along with a look at the major preservation services such as Portico, CLOCKSS and HathiTrust. Publishers and ebook aggregators are also examined to provide a broad environmental scan of the current ebook preservation activities and risks.  相似文献   
8.
9.
10.
Using a participatory learning approach, we report on the delivery and evaluation of a climate change and risk assessment tool to help manage water risks within the agricultural sector. Post-graduate water-professional students from a range of countries, from both developed and emerging economies were involved in using this tool. Our approach included participative learning tools – group discussion, software, and risk matrices. The materials developed met the needs of the students, allowing these students to incorporate their learning and adapt the package of materials for use in their home countries. Analysis of evaluations show that the tools and materials are particularly useful and emphasizes the need for sound learning materials and tools, funding to deliver training, and policy support to accelerate education and adoption of authentic climate change adaptation practices. The expected benefits for water professionals about climate change will be translated into improved socioeconomic and environmental outcomes if adopted.  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