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   9265篇
  免费   110篇
  国内免费   8篇
教育   6409篇
科学研究   1121篇
各国文化   53篇
体育   709篇
综合类   3篇
文化理论   66篇
信息传播   1022篇
  2022年   58篇
  2021年   119篇
  2020年   161篇
  2019年   223篇
  2018年   371篇
  2017年   341篇
  2016年   323篇
  2015年   189篇
  2014年   323篇
  2013年   1572篇
  2012年   224篇
  2011年   249篇
  2010年   235篇
  2009年   201篇
  2008年   246篇
  2007年   206篇
  2006年   189篇
  2005年   162篇
  2004年   191篇
  2003年   136篇
  2002年   135篇
  2001年   206篇
  2000年   218篇
  1999年   190篇
  1998年   98篇
  1997年   129篇
  1996年   109篇
  1995年   80篇
  1994年   99篇
  1993年   72篇
  1992年   167篇
  1991年   129篇
  1990年   117篇
  1989年   143篇
  1988年   124篇
  1987年   98篇
  1986年   106篇
  1985年   102篇
  1984年   77篇
  1983年   90篇
  1982年   61篇
  1981年   60篇
  1980年   57篇
  1979年   99篇
  1978年   63篇
  1977年   61篇
  1976年   50篇
  1975年   48篇
  1974年   58篇
  1973年   52篇
排序方式: 共有9383条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
With the rise of microfluidics for the past decade, there has come an ever more pressing need for a low-cost and rapid prototyping technology, especially for research and education purposes. In this article, we report a rapid prototyping process of chromed masks for various microfluidic applications. The process takes place out of a clean room, uses a commercially available video-projector, and can be completed in less than half an hour. We quantify the ranges of fields of view and of resolutions accessible through this video-projection system and report the fabrication of critical microfluidic components (junctions, straight channels, and curved channels). To exemplify the process, three common devices are produced using this method: a droplet generation device, a gradient generation device, and a neuro-engineering oriented device. The neuro-engineering oriented device is a compartmentalized microfluidic chip, and therefore, required the production and the precise alignment of two different masks.  相似文献   
55.
The authors examined the relationship between stress, adaptive coping, and life satisfaction among college students who reported having a friend or family member with eating disorder symptomatology. A hierarchical regression confirmed the study's hypotheses. Higher stress was linked with less life satisfaction. After stress was controlled, plan coping had a beneficial influence on life satisfaction. College counselors can use these findings when choosing interventions for clients who are close to someone with an eating disorder.  相似文献   
56.
57.
58.
59.
In collaborative problem solving, children produce and evaluate arguments for proposals. We investigated whether 3- and 5-year-olds (N = 192) can produce and evaluate arguments against those arguments (i.e., counter-arguments). In Study 1, each child within a peer dyad was privately given a reason to prefer one over another solution to a task. One child, however, was given further information that would refute the reasoning of their partner. Five-year-olds, but not 3-year-olds, identified and produced valid and relevant counter-arguments. In Study 2, 3-year-olds were given discourse training (discourse that contrasted valid and invalid counter-arguments) and then given the same problem-solving tasks. After training, 3-year-olds could also identify and produce valid and relevant counter-arguments. Thus, participating in discourse about reasons facilitates children’s counter-argumentation.  相似文献   
60.
At the University of Maine, middle and high school teachers observed more than 250 university science, technology, engineering, and mathematics classes and collected information on the nature of instruction, including how clickers were being used. Comparisons of classes taught with (n = 80) and without (n = 184) clickers show that, while instructional behaviors differ, the use of clickers alone does not significantly impact the time instructors spend lecturing. One possible explanation stems from the observation of three distinct modes of clicker use: peer discussion, in which students had the opportunity to talk with one another during clicker questions; individual thinking, in which no peer discussion was observed; and alternative collaboration, in which students had time for discussion, but it was not paired with clicker questions. Investigation of these modes revealed differences in the range of behaviors, the amount of time instructors lecture, and how challenging the clicker questions were to answer. Because instructors can vary their instructional style from one clicker question to the next, we also explored differences in how individual instructors incorporated peer discussion during clicker questions. These findings provide new insights into the range of clicker implementation at a campus-wide level and how such findings can be used to inform targeted professional development for faculty.  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