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   5929篇
  免费   74篇
  国内免费   7篇
教育   4035篇
科学研究   603篇
各国文化   41篇
体育   528篇
综合类   8篇
文化理论   88篇
信息传播   707篇
  2023年   34篇
  2022年   57篇
  2021年   80篇
  2020年   136篇
  2019年   232篇
  2018年   304篇
  2017年   335篇
  2016年   287篇
  2015年   189篇
  2014年   188篇
  2013年   1170篇
  2012年   190篇
  2011年   206篇
  2010年   168篇
  2009年   126篇
  2008年   106篇
  2007年   147篇
  2006年   97篇
  2005年   106篇
  2004年   85篇
  2003年   82篇
  2002年   68篇
  2001年   100篇
  2000年   88篇
  1999年   81篇
  1998年   67篇
  1997年   55篇
  1996年   62篇
  1995年   36篇
  1994年   44篇
  1993年   33篇
  1992年   58篇
  1991年   58篇
  1990年   44篇
  1989年   45篇
  1988年   38篇
  1987年   39篇
  1986年   45篇
  1985年   46篇
  1984年   48篇
  1983年   27篇
  1982年   39篇
  1981年   37篇
  1980年   24篇
  1979年   45篇
  1978年   38篇
  1977年   30篇
  1976年   23篇
  1974年   25篇
  1972年   26篇
排序方式: 共有6010条查询结果,搜索用时 15 毫秒
31.
A paper read at the first regular meeting of the Osler Society of McGill University, October 19, 1921.  相似文献   
32.
33.
34.
In Information Retrieval, since it is hard to identify users’ information needs, many approaches have been tried to solve this problem by expanding initial queries and reweighting the terms in the expanded queries using users’ relevance judgments. Although relevance feedback is most effective when relevance information about retrieved documents is provided by users, it is not always available. Another solution is to use correlated terms for query expansion. The main problem with this approach is how to construct the term-term correlations that can be used effectively to improve retrieval performance. In this study, we try to construct query concepts that denote users’ information needs from a document space, rather than to reformulate initial queries using the term correlations and/or users’ relevance feedback. To form query concepts, we extract features from each document, and then cluster the features into primitive concepts that are then used to form query concepts. Experiments are performed on the Associated Press (AP) dataset taken from the TREC collection. The experimental evaluation shows that our proposed framework called QCM (Query Concept Method) outperforms baseline probabilistic retrieval model on TREC retrieval.  相似文献   
35.
36.
The technical study of wall paintings from the Buddhist temple complex at Nako, Western Himalayas, was one of the basic preconditions required for designing an appropriate conservation strategy. The complex, composed of four temples from the eleventh–twelfth century, offered a unique possibility to carry out a comprehensive research of technology and painting materials used in early and later western Tibetan Buddhist wall paintings as well as a comparative assessment with murals from other sites in the Western Himalayas. The study was based on extensive fieldwork and an integrated analytical approach comprising a wide range of non-destructive and micro-destructive methods. Answering the question of the coevality of paintings in the smaller temples with other original murals, the precise characterisation of binding media, the detection of the yellow dye gamboge and natural minerals posnjakite and brochantite identified for the first time in Himalayan murals, the clarification of technology of metal decoration, and the making of raised elements are some of the most exciting results which emerged from the research.  相似文献   
37.
The current state of the Russian Science Citation Index is analyzed. Several areas for its further development identified by long-standing active users, such as data searching, refinement, and storage; current user alerts; data input with the Science Index license; patent information; and the application programming interface (API) are investigated.  相似文献   
38.
39.
This reflection essay describes the Central States Region as an area rich in intercultural communication. González describes Mexican American migrant farmworker organizing as an intercultural activity since the union activists attempted to influence both Mexican heritage and European heritage audiences. González also describes the many interculturalists working in the Midwest who influenced his early research.  相似文献   
40.
This study was conducted in an environment of widespread use of social media and mobile applications in the mass media. The general goal of the study was to analyze the use of WhatsApp in cybermedia, specifically in radio. A case study was proposed to examine the use of WhatsApp on the program Las mañanas de RNE, broadcast by Spanish National Radio. It was found that the public was very accepting of the program’s initiative to solicit WhatsApp voice messages, beginning in November 2015. The case study used audio files of a direct broadcast that included specific times for audience participation. The use of WhatsApp was accepted by the audience, in addition to the use of the conventional telephone, as a tool well-suited to listener participation in radio programming. Finally, the study highlights the importance of interactive, participatory spaces in broadcasts through the creation of synergies with new forms of online participation.  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