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   19792篇
  免费   288篇
  国内免费   138篇
教育   13563篇
科学研究   2571篇
各国文化   138篇
体育   1671篇
综合类   17篇
文化理论   153篇
信息传播   2105篇
  2021年   145篇
  2020年   287篇
  2019年   417篇
  2018年   563篇
  2017年   550篇
  2016年   522篇
  2015年   348篇
  2014年   455篇
  2013年   3345篇
  2012年   413篇
  2011年   452篇
  2010年   348篇
  2009年   338篇
  2008年   351篇
  2007年   408篇
  2006年   362篇
  2005年   338篇
  2004年   324篇
  2003年   320篇
  2002年   288篇
  2001年   343篇
  2000年   384篇
  1999年   350篇
  1998年   207篇
  1997年   205篇
  1996年   234篇
  1995年   202篇
  1994年   173篇
  1993年   170篇
  1992年   282篇
  1991年   278篇
  1990年   282篇
  1989年   311篇
  1988年   269篇
  1987年   273篇
  1986年   285篇
  1985年   310篇
  1984年   270篇
  1983年   271篇
  1982年   225篇
  1981年   206篇
  1980年   182篇
  1979年   285篇
  1978年   234篇
  1977年   214篇
  1976年   187篇
  1975年   158篇
  1974年   178篇
  1973年   162篇
  1971年   141篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
902.
903.
904.
Abstract

If formal educators are to play a role in preparing future citizens for making decisions about health and environmental risks, then they must be willing and able to incorporate risk education. This article presents 10 goals for risk education. It also describes current risk education practices, future interests, and perceived barriers to risk education of Michigan, Ohio, and Wisconsin Grades 6–12 science teachers. Data were collected through a mail questionnaire (1,336 surveys were returned, adjusted return rate = 80%) and in-depth telephone interviews (completed with 45 teachers, return rate = 90%). Many teachers had covered some aspect of risk education and were interested in enhancing their efforts. Results also suggest that teachers need to be made aware of risk education resources and provided with training, particularly regarding psychological influences on risk decisions.  相似文献   
905.
The author has compared groups of educationally sub‐normal adolescents in special schools with others in special classes in ordinary schools, with regard to their choices of jobs and actual later employment. Among other related findings, it transpired that many ESN pupils made realistic choices of occupation as well as did the normal pupils, and were more stable in their jobs than the normal pupils.  相似文献   
906.
This paper evaluates the impact of teaching innovations, introduced in public primary schools under the Children Resources International (CRI) Program, on student outcomes. We estimate students’ learning based on their scores on standardized tests. We match schools and children within the treatment and comparison group and find that the CRI Program has been effective in raising learning achievement. Moreover, the results are robust to unobserved selection bias. The average gain for a CRI student represents an improvement of 0.40 standard deviations. The results stay unchanged when we use alternative estimators for the treatment effect including the bias-corrected estimator proposed by Abadie and Imbens (2006).  相似文献   
907.
We present the process our institution used to create a statistics requirement for almost all incoming first‐year students. From conception and planning, to hiring and acceptance by the university community, we offer lessons learned should you consider making such a shift in your own curriculum.  相似文献   
908.
This paper provides a first approach to the history of Ibérica, one of the most important popular science magazines published in Spain before the Civil War. Founded in 1914 by members of the Society of Jesus based at the Ebro Observatory, Ibérica reached a weekly circulation of about 10,000 in the mid 1920s, and was instrumental in extending science education in Jesuit education facilities and in developing a “reactionary modernist” culture that embraced Catholicism and modernisation. By focusing on its coverage of radioactivity and the radium industry, the article aims to examine the magazine’s popularising style and ideology, and to determine its role in the debates regarding the cultural value of science in the first decades of twentieth century Spain.  相似文献   
909.
In this article we first try to answer the question posed in the title in the context of a real life situation. We suggest sequential methods of selecting a member from a given set of individuals. We show that these methods indeed assign ‘equal chance’ of being selected to all individuals.  相似文献   
910.
Children living in poverty are 1.3 times as likely as non‐poor children to experience reading difficulties and lack key oral experiences that contribute to early literacy development. The purpose of this research was to study the effects of viewing commercially available educational television with closed captions. Seventy second‐ and third‐grade economically disadvantaged children living in urban locations participated in this experimental research design. Children were randomly assigned to view videos with or without closed captions. Captions helped children recognise and read more words, identify the meaning of those words, generate inferences regarding programme content and transfer these skills to a normative code‐related skill task. Risk status moderated word recognition performance: those at risk benefited from captions while those who were not at risk recognised more words when captions were absent.  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