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   125109篇
  免费   1868篇
  国内免费   246篇
教育   86901篇
科学研究   13488篇
各国文化   2004篇
体育   9846篇
综合类   183篇
文化理论   1081篇
信息传播   13720篇
  2021年   961篇
  2020年   1675篇
  2019年   2586篇
  2018年   3159篇
  2017年   3383篇
  2016年   3430篇
  2015年   2331篇
  2014年   3186篇
  2013年   27316篇
  2012年   2424篇
  2011年   2803篇
  2010年   2359篇
  2009年   2634篇
  2008年   2442篇
  2007年   2178篇
  2006年   2420篇
  2005年   2392篇
  2004年   3081篇
  2003年   2365篇
  2002年   2211篇
  2001年   2141篇
  2000年   1806篇
  1999年   1663篇
  1998年   1475篇
  1997年   1534篇
  1996年   1700篇
  1995年   1468篇
  1994年   1480篇
  1993年   1472篇
  1992年   1577篇
  1991年   1482篇
  1990年   1464篇
  1989年   1399篇
  1988年   1260篇
  1987年   1195篇
  1986年   1214篇
  1985年   1487篇
  1984年   1327篇
  1983年   1333篇
  1982年   1272篇
  1981年   1197篇
  1980年   1186篇
  1979年   1312篇
  1978年   1229篇
  1977年   1140篇
  1976年   1030篇
  1975年   833篇
  1974年   832篇
  1973年   804篇
  1971年   666篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
952.
The author contemplates the fate of Russian science in the light of the reforms that are going on today, and the requirements of bringing it into conformity with this country’s traditions as well as with international practices.  相似文献   
953.
ABSTRACT

Press credentialing practices are a vital, yet understudied site of scholarly research on journalistic norms and practices. Press credentialing not only structures internal professional hierarchies, but they also signify the boundaries of the journalistic field itself. This paper explores the legal and theoretical implications of press credentialing to cover the United States Congress, drawing on the concepts of boundary work and journalistic authority to demonstrate the material impact of the space between fields on professional legitimation in journalism. Using WorldNetDaily (WND) as a case study, I argue that the Standing Committee of Correspondents (SCC) occupies a hybrid boundary zone between the journalistic and political fields, generating a unique tension in First Amendment jurisprudence that places journalists in a paradoxical role as both the professional embodiments of free speech and its constitutional steward. The resulting jurisdictional conflict between the SCC and WND extends the relational model of journalistic authority by articulating how journalist-state relations can fundamentally augment the process of legitimation at its fuzzy boundaries. The relevance and implications for press credentialing practices in the digital age are discussed.  相似文献   
954.
955.
956.
957.
Emerging fathers experience a variety of stressors, including identity and role transitions, changes in their relationships, and challenges in developing caregiving skills. Increasing expectations for father involvement in childcare are emphasizing the importance of the father role, but social supports for new fathers remain scarce. Nineteen expectant and new fathers participated in a pilot 5-week group intervention aimed at improving stress coping and involvement attitudes using a combination of mindfulness practices and skill-building for parenting and partner communication. We administered surveys pre- and postintervention to assess efficacy in the areas of stress, depressive symptoms, father involvement attitudes, and mindfulness. Within-participant differences were compared across participants as well as examining individual reliable change. Results indicated initial reductions in stress and depressive symptoms and increases in the mindfulness constructs of nonjudgment and nonreactivity. No significant changes were found in father involvement attitudes. Perinatal intervention specific to fathers holds promise as an underexplored avenue for supporting families across the transition to parenthood.  相似文献   
958.
959.
Abstract

This article discusses the use of R programing language for executing a sentiment analysis of tweets pertaining to library topics. This discussion is situated within the literature of marketing and management sciences, which is employing methods of machine learning and business intelligence to make informed decision-making, and library administration, which has expressed great interest in social media engagement within its literature but has yet to adopt these types of analysis. Presented in this article is a sample code with instructions on how users may execute it within R to retrieve and analyze tweets relevant to library services. Two examples created using the code (analysis of top librarians’ tweets and analysis of posts about major book publishers) are used to demonstrate the functionality of the code. The code presented in this article may be used by libraries to analyze tweets about their library and library-related topics, which, in turn, may inform management and marketing design.  相似文献   
960.
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