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   29962篇
  免费   218篇
  国内免费   16篇
教育   21430篇
科学研究   2844篇
各国文化   216篇
体育   2203篇
综合类   23篇
文化理论   525篇
信息传播   2955篇
  2021年   145篇
  2020年   268篇
  2019年   416篇
  2018年   2627篇
  2017年   2632篇
  2016年   2078篇
  2015年   459篇
  2014年   553篇
  2013年   3539篇
  2012年   613篇
  2011年   1173篇
  2010年   1184篇
  2009年   803篇
  2008年   1032篇
  2007年   1537篇
  2006年   405篇
  2005年   698篇
  2004年   1011篇
  2003年   805篇
  2002年   593篇
  2001年   300篇
  2000年   341篇
  1999年   260篇
  1998年   139篇
  1997年   183篇
  1996年   207篇
  1995年   178篇
  1994年   177篇
  1993年   158篇
  1992年   228篇
  1991年   221篇
  1990年   205篇
  1989年   247篇
  1988年   204篇
  1987年   229篇
  1986年   205篇
  1985年   254篇
  1984年   212篇
  1983年   188篇
  1982年   175篇
  1981年   158篇
  1980年   135篇
  1979年   191篇
  1978年   156篇
  1977年   132篇
  1976年   158篇
  1975年   117篇
  1974年   137篇
  1973年   110篇
  1971年   115篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Hospital physicians naturally require current medical information in order to treat their patients. An objectively obtained SDILINE storesearch was devised to obtain this information. A rank-ordered list of hospital discharge diagnoses, coded with ICDA terms, was translated into MeSH. The top two Bradford zones of journals defined as useful at the University of Missouri--Kansas City were ANDed to these MeSH terms. Citations retrieved from the storesearch are input into an in-house computerized data base. The method can be easily used by other medical or hospital libraries without access to computers.  相似文献   
62.
63.
64.
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   
65.
66.
67.
68.
69.
This paper describes the procedures used at the Library of the College of Physicians of Philadelphia to divide its ninety-year-old dictionary card catalog. The division was necessitated by overcrowding, obsolete subject headings, and lack of a complete authority list which resulted in like materials being scattered throughout the catalog under several headings. Two catalogs were created: the historical-biographical catalog, representing all works published before 1950 and all works of historical or biographical nature; and the current catalog, containing all works published from 1950 on, excepting historical or biographical materials. The 1950- catalog was further divided into name and subject catalogs, and the subject section was revised according to MeSH. The project was completed in about two years. As a result, searching time has been much reduced, and the library is able to take advantage of the annual revisions of MeSH to update the subject catalog.  相似文献   
70.
Drawing on components of agenda-setting theory and the two-step flow of information from mass media to news audiences, this study examines the effects of mass and interpersonal communication on breast cancer screening practices among college- and middle-aged women (n = 284). We theorized that screening behaviors among younger women would be influenced more by interpersonal sources of information while screening among middle-aged women would be more influenced by exposure to mass-mediated information. Findings supported anticipated patterns, revealing important and varying roles for both mass and interpersonal communication in the health behaviors of women. Implications for health practitioners and campaign planners, as well as recommendations for future research, are discussed.  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