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   9309篇
  免费   109篇
  国内免费   4篇
教育   6436篇
科学研究   1165篇
各国文化   100篇
体育   559篇
综合类   3篇
文化理论   71篇
信息传播   1088篇
  2021年   86篇
  2020年   98篇
  2019年   168篇
  2018年   234篇
  2017年   212篇
  2016年   196篇
  2015年   126篇
  2014年   176篇
  2013年   1840篇
  2012年   176篇
  2011年   179篇
  2010年   160篇
  2009年   147篇
  2008年   175篇
  2007年   156篇
  2006年   154篇
  2005年   124篇
  2004年   145篇
  2003年   119篇
  2002年   136篇
  2001年   142篇
  2000年   142篇
  1999年   142篇
  1998年   89篇
  1997年   95篇
  1996年   104篇
  1995年   81篇
  1994年   69篇
  1993年   105篇
  1992年   136篇
  1991年   126篇
  1990年   131篇
  1989年   112篇
  1988年   99篇
  1987年   121篇
  1986年   112篇
  1985年   125篇
  1984年   101篇
  1983年   107篇
  1982年   112篇
  1981年   92篇
  1980年   95篇
  1979年   123篇
  1978年   115篇
  1977年   95篇
  1976年   93篇
  1975年   68篇
  1974年   84篇
  1973年   82篇
  1971年   72篇
排序方式: 共有9422条查询结果,搜索用时 15 毫秒
31.
Among the huge maze of resources available on the Internet, UnCoverWeb stands out as a valuable tool for medical libraries. This up-to-date, free-access, multidisciplinary database of periodical references is searched through an easy-to-learn graphical user interface that is a welcome improvement over the telnet version. This article reviews the basic and advanced search techniques for UnCoverWeb, as well as providing information on the document delivery functions and table of contents alerting service called Reveal. UnCover's currency is evaluated and compared with other current awareness resources. System deficiencies are discussed, with the conclusion that although UnCoverWeb lacks the sophisticated features of many commercial database search services, it is nonetheless a useful addition to the repertoire of information sources available in a library.  相似文献   
32.
33.
34.
35.
This paper reviews the current situation in library school education for medical librarianship in the United States and Canada based on information from a questionnaire sent to teachers of courses in medical librarianship in accredited library schools. Since 1939, when the first course devoted entirely to medical librarianship was offered at Columbia University, courses have been introduced into the curricula of at least forty-seven of the ALA-accredited library schools. In 1978 there were seventy courses available through forty-seven library schools. Possibilities for specialization in medical librarianship are examined. Course content is reviewed. Implications of the MLA certification examination for library school courses are explored.  相似文献   
36.
在中世纪的欧洲,曾经出现被后人称为欧洲历史上最荒唐的群众狂潮之一:郁金香热.当时社会里人性盲目和疯狂的一面,既贻笑后人,又触目惊心,令人难忘.  相似文献   
37.
Book Reviews     
Zuckerman: Scientist Extraordinary by Bernard Donovan BioScientifica, Bristol, 2005, 555pp. ISBN 1‐901978249 £24.95 Negotiating licences for digital resources by Fiona Durrant Facet Publishing, 2006, ISBN 1 85604 586 2 Metadata for Information Management and Retrieval By David Haynes Facet Publishing, 2004, ISBN 1 85604 4890  相似文献   
38.
This study sought to determine if exposure to two communication-oriented activities, videotapes and public service announcements, accounts for changes in substance use among adolescents participating in the Drug Resistance Strategies Project's keepin' it REAL adolescent substance use prevention curriculum. Middle-school students (4,734, 72% Latino) responded to questionnaires related to these analyses. An analysis of covariance (ANCOVA) model was fit separately to six substance use outcomes. The results suggested that intervention students who saw four or five videos engaged in less substance use in the past month than did students who saw fewer videos. Having seen the PSAs one or more times did not predict the reported change in substance use.  相似文献   
39.
40.
This paper addresses several misunderstandings about the nature of the FBI's Central Records System. Although depicted in popular culture and much of FBI historiography as a tool for the Cold War suppression of American radicals, the FBI's records system grew out of Department of Justice systems already in place before J. Edgar Hoover became Director in 1924. The system grew in size and complexity according to the demands placed on it by the changing priorities of the FBI's criminal and intelligence missions, guided by a “progressive” drive for efficiency through centralization.  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