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   17230篇
  免费   202篇
  国内免费   25篇
教育   11735篇
科学研究   2041篇
各国文化   139篇
体育   1532篇
综合类   9篇
文化理论   144篇
信息传播   1857篇
  2021年   167篇
  2020年   246篇
  2019年   342篇
  2018年   522篇
  2017年   510篇
  2016年   469篇
  2015年   307篇
  2014年   468篇
  2013年   2988篇
  2012年   392篇
  2011年   414篇
  2010年   359篇
  2009年   323篇
  2008年   379篇
  2007年   366篇
  2006年   321篇
  2005年   291篇
  2004年   300篇
  2003年   281篇
  2002年   259篇
  2001年   338篇
  2000年   339篇
  1999年   314篇
  1998年   163篇
  1997年   193篇
  1996年   210篇
  1995年   150篇
  1994年   188篇
  1993年   149篇
  1992年   302篇
  1991年   262篇
  1990年   246篇
  1989年   268篇
  1988年   232篇
  1987年   208篇
  1986年   235篇
  1985年   235篇
  1984年   184篇
  1983年   214篇
  1982年   164篇
  1981年   171篇
  1980年   152篇
  1979年   257篇
  1978年   170篇
  1977年   166篇
  1976年   158篇
  1975年   126篇
  1974年   144篇
  1973年   115篇
  1971年   109篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
Placing Facebook     
Facebook is challenging professional journalism. These challenges were evident in three incidents from 2016: the allegation that Facebook privileged progressive-leaning news on its trending feature; Facebook’s removal of the Pulitzer Prize-winning “Napalm Girl” photo from the pages of prominent users; and the proliferation of “fake news” during the US presidential election. Using theoretical concepts from the field of boundary work, this paper examines how The Guardian, The New York Times, Columbia Journalism Review and Poynter editorialized Facebook’s role in these three incidents to discursively construct the boundary between the value of professional journalism to democracy and Facebook’s ascendant role in facilitating essential democratic functions. Findings reveal that these publications attempted to define Facebook as a news organization (i.e., include it within the boundaries of journalism) so that they could then criticize the company for not following duties traditionally incumbent upon news organizations (i.e., place it outside the boundaries of journalism). This paper advances scholarship that focuses on both inward and outward conceptions of boundary work, further explores the complex challenge of defining who a journalist is in the face of rapidly changing technological norms, and advances scholarship in the field of media ethics that positions ethical analysis at the institutional level.  相似文献   
102.
103.
104.
105.
106.
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   
107.
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   
108.
109.
110.
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