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   34314篇
  免费   548篇
  国内免费   37篇
教育   24957篇
科学研究   3004篇
各国文化   280篇
体育   2585篇
综合类   41篇
文化理论   258篇
信息传播   3774篇
  2021年   319篇
  2020年   489篇
  2019年   702篇
  2018年   992篇
  2017年   1066篇
  2016年   987篇
  2015年   598篇
  2014年   811篇
  2013年   6498篇
  2012年   806篇
  2011年   936篇
  2010年   679篇
  2009年   635篇
  2008年   790篇
  2007年   693篇
  2006年   712篇
  2005年   551篇
  2004年   521篇
  2003年   471篇
  2002年   568篇
  2001年   684篇
  2000年   631篇
  1999年   613篇
  1998年   324篇
  1997年   364篇
  1996年   404篇
  1995年   366篇
  1994年   328篇
  1993年   343篇
  1992年   507篇
  1991年   468篇
  1990年   503篇
  1989年   507篇
  1988年   493篇
  1987年   414篇
  1986年   424篇
  1985年   494篇
  1984年   422篇
  1983年   448篇
  1982年   355篇
  1981年   344篇
  1980年   316篇
  1979年   445篇
  1978年   362篇
  1977年   335篇
  1976年   290篇
  1975年   243篇
  1974年   228篇
  1973年   256篇
  1971年   192篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
In order to assess the current status of MEDLINE training provided by schools of library science, a survey was conducted of those schools having an educational identification code issued by the National Library of Medicine. Information was gathered on such variables as the instructors' background and preparation, the course objectives and content, and the amount of on-line experience provided to students in each of eleven programs. An evaluation of these measures indicates that more opportunities to gain experience in using MEDLINE should be initiated by library schools and that current efforts should be continued and expanded. Specific recommendations for accomplishing these goals are outlined; they are addressed to health sciences librarians, library school educators, the Medical Library Association, and the National Library of Medicine.  相似文献   
122.
123.
124.
125.
126.
127.
128.
129.
130.
Indexing consistency in MEDLINE   总被引:3,自引:0,他引:3  
The quality of indexing of periodicals in a bibliographic data base cannot be measured directly, as there is no one "correct" way to index an item. However, consistency can be used to measure the reliability of indexing. To measure consistency in MEDLINE, 760 twice-indexed articles from 42 periodical issues were identified in the data base, and their indexing compared. Consistency, expressed as a percentage, was measured using Hooper's equation. Overall, checktags had the highest consistency. Medical Subject Headings (MeSH) and subheadings were applied more consistently to central concepts than to peripheral points. When subheadings were added to a main heading, consistency was lowered. "Floating" subheadings were more consistent than were attached subheadings. Indexing consistency was not affected by journal indexing priority, language, or length of the article. Terms from MeSH Tree Structure categories A, B, and D appeared more often than expected in the high-consistency articles; whereas terms from categories E, F, H, and N appeared more often than expected in the low-consistency articles. MEDLINE, with its excellent controlled vocabulary, exemplary quality control, and highly trained indexers, probably represents the state of the art in manually indexed data bases.  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