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   21196篇
  免费   127篇
  国内免费   10篇
教育   15738篇
科学研究   2244篇
各国文化   71篇
体育   1004篇
综合类   4篇
文化理论   445篇
信息传播   1827篇
  2022年   61篇
  2021年   116篇
  2020年   155篇
  2019年   228篇
  2018年   2448篇
  2017年   2338篇
  2016年   1850篇
  2015年   307篇
  2014年   431篇
  2013年   1841篇
  2012年   454篇
  2011年   940篇
  2010年   1042篇
  2009年   641篇
  2008年   883篇
  2007年   1333篇
  2006年   273篇
  2005年   561篇
  2004年   631篇
  2003年   498篇
  2002年   285篇
  2001年   245篇
  2000年   248篇
  1999年   210篇
  1998年   117篇
  1997年   172篇
  1996年   118篇
  1995年   95篇
  1994年   113篇
  1993年   89篇
  1992年   184篇
  1991年   146篇
  1990年   135篇
  1989年   164篇
  1988年   133篇
  1987年   121篇
  1986年   130篇
  1985年   119篇
  1984年   90篇
  1983年   102篇
  1982年   70篇
  1981年   61篇
  1980年   64篇
  1979年   111篇
  1978年   71篇
  1977年   65篇
  1976年   57篇
  1975年   54篇
  1974年   62篇
  1973年   56篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
52.
53.
Acquiring both published and unpublished documents produced in Africa is, generally, a difficult task due to the existing poor state of bibliographic control and the publishing industry. It is even more difficult to obtain unpublished documents in a specialized area of study such as demography--a diffuse area which cuts across several disciplines. This paper discusses the problems encountered on acquisition trips to some African countries to acquire unpublished population material.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   
54.
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   
55.
56.
57.
58.
59.
60.
"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   
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