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   3260篇
  免费   28篇
  国内免费   11篇
教育   2166篇
科学研究   421篇
各国文化   41篇
体育   249篇
综合类   11篇
文化理论   40篇
信息传播   371篇
  2022年   22篇
  2021年   66篇
  2020年   67篇
  2019年   121篇
  2018年   203篇
  2017年   163篇
  2016年   164篇
  2015年   90篇
  2014年   107篇
  2013年   622篇
  2012年   120篇
  2011年   69篇
  2010年   66篇
  2009年   60篇
  2008年   72篇
  2007年   60篇
  2006年   56篇
  2005年   45篇
  2004年   34篇
  2003年   29篇
  2002年   37篇
  2001年   24篇
  2000年   27篇
  1999年   29篇
  1998年   32篇
  1996年   23篇
  1995年   17篇
  1994年   21篇
  1993年   23篇
  1992年   30篇
  1991年   29篇
  1990年   30篇
  1989年   33篇
  1988年   29篇
  1987年   18篇
  1986年   32篇
  1985年   30篇
  1984年   32篇
  1983年   20篇
  1982年   29篇
  1980年   20篇
  1979年   21篇
  1978年   16篇
  1977年   18篇
  1976年   19篇
  1967年   17篇
  1941年   19篇
  1939年   23篇
  1937年   41篇
  1936年   40篇
排序方式: 共有3299条查询结果,搜索用时 15 毫秒
21.
This study investigates the convergence of two bibliometric approaches to the measurement of interdisciplinary research: one based on analyzing disciplinary diversity in the reference list of publications, the other based on the disciplinary diversity of authors of publications. In particular we measure the variety, balance, disparity and integrated diversity index of, respectively, single-author, multi-author single-field, and multi-author multi-field publications. We find that, in general, the diversity of the reference list grows with the number of fields reflected in a paper’s authors’ list and, to a lesser extent, with the number of authors being equal the number of fields. Further, we find that when fields belonging to different disciplines are reflected in the authors’ list, the disparity in the reference list is higher than in the case of fields belonging to the same discipline. However, this general tendency varies across disciplines, and noticeable exceptions are found at individual paper level.  相似文献   
22.
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   
23.
24.
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   
25.
26.
27.
This article summarizes the findings of an NFER project which studied the roles, management and practices of LEA advisory services throughout England and Wales. The full report of the research (Stillman and Grant, 1988) will be published in January by NFER‐NELSON.  相似文献   
28.
Previous attempts to examine the effects of different types of text format on reading have focused on the improvement of reading. The present study investigated the effect of using a text format that might be predicted to disrupt reading. In this study 56 individuals were presented with reading material presented in right-justified format and in'ragged'uneven line format. Subjects performed significantly worse on right-justified material. Subjects who were classified as good readers on the basis of a pretest were more affected than poor readers. It is suggested that this may result from differences in the reading style of good and poor readers.  相似文献   
29.
This paper analyzes modern information technologies as applied in the political environment and considers the content and peculiarities of using IT programs in strategic political modeling.  相似文献   
30.
The main aspects of the creation of a monitoring system for the research activities of the members of a higher-education institution are considered. The scientific activities of the lecturers and members of Turgenev Orel State University is used as the basis. It is expected that this system will be an efficient tool for optimal managerial decisions at all levels.  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