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   8370篇
  免费   100篇
  国内免费   8篇
教育   5703篇
科学研究   1105篇
各国文化   50篇
体育   609篇
综合类   3篇
文化理论   53篇
信息传播   955篇
  2022年   46篇
  2021年   101篇
  2020年   134篇
  2019年   180篇
  2018年   297篇
  2017年   272篇
  2016年   264篇
  2015年   162篇
  2014年   270篇
  2013年   1386篇
  2012年   205篇
  2011年   238篇
  2010年   202篇
  2009年   182篇
  2008年   224篇
  2007年   188篇
  2006年   171篇
  2005年   154篇
  2004年   174篇
  2003年   127篇
  2002年   132篇
  2001年   195篇
  2000年   202篇
  1999年   180篇
  1998年   95篇
  1997年   127篇
  1996年   99篇
  1995年   73篇
  1994年   91篇
  1993年   65篇
  1992年   150篇
  1991年   118篇
  1990年   112篇
  1989年   140篇
  1988年   121篇
  1987年   95篇
  1986年   105篇
  1985年   100篇
  1984年   77篇
  1983年   89篇
  1982年   59篇
  1981年   58篇
  1980年   57篇
  1979年   98篇
  1978年   62篇
  1977年   61篇
  1976年   50篇
  1975年   47篇
  1974年   55篇
  1973年   50篇
排序方式: 共有8478条查询结果,搜索用时 406 毫秒
21.
Acquiring both published and unpublished documents produced in Africa is, generally, a difficult task due to the existing poor state of bibliographic control and the publishing industry. It is even more difficult to obtain unpublished documents in a specialized area of study such as demography--a diffuse area which cuts across several disciplines. This paper discusses the problems encountered on acquisition trips to some African countries to acquire unpublished population material. To help solve the problems, the Population Association of Africa must persuade its members to send copies of their publications to population libraries and documentation centers in their individual countries for dissemination to the other users in Africa. The various organizations and institutions in Africa engaged in the teaching and research of population studies should have an agreement to exchange copies of their theses. The Economic Commission for Africa (ECA) and the Organization of African Unity (OAU) should make representations to the various African member countries on the need to disseminate the results of vital censuses and surveys conducted. Finally, the Population Information Network for Africa (POPIN-AFRICA) with its coordinating unit at the population division of ECA should ensure that all the nodes of the network have the financial and other resources to be able to acquire the relevant documents needed for their operations.  相似文献   
22.
Computers are integral to medical practice, education, and research. While medical students learn computer skills during their training, many practicing physicians do not have the same computer experience. To familiarize this group with the exciting developments in medical informatics, the Himmelfarb Health Sciences Library and Department of Computer Medicine at the George Washington University Medical Center organized a workshop "Introducing Your Office Computer!" for attending physicians. The workshop featured a short lecture/video presentation on computer applications in medicine followed by a "computer fair" of five computer applications. Eleven physicians attended the workshop. Feedback was very positive; many called later to request more detailed instructions on using the programs demonstrated. It was a valuable experience for the staff, and new bridges were built between departments and clients.  相似文献   
23.
24.
25.
26.
27.
28.
"Change" is a critical dimension of contemporary experience. Library associations are not exempt, and they change in ways similar to other organizations. According to some authorities, four phases typify the process: diagnosis, design, implementation, and incorporation. Focusing on changes in the Medical Library Association's longstanding program of continuing education, the authors utilize the "phase framework" to chart that association's movement from a management system depending primarily upon volunteers to one in which professional staff figure prominently. The historical review serves a heuristic purpose for individuals and institutions in identifying characteristic features of the change process.  相似文献   
29.
30.
This study, an historical survey of medical journals in Louisiana before the outbreak of the Civil War in 1861, revealed that nine journals made an appearance during the period covered-all of them published in New Orleans. Of these, two were French language journals published by a French medical society. The others were all published by individuals rather than by professional societies. Medical practices, interests, and problems of the times were clearly reflected on the pages of the journals. It is evident that medical journalism reached a high plane in the era before the Civil War. Of the nine periodicals, only one emerged as a permanent publication after the War.  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