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   25556篇
  免费   429篇
  国内免费   17篇
教育   18083篇
科学研究   2374篇
各国文化   235篇
体育   2105篇
综合类   20篇
文化理论   211篇
信息传播   2974篇
  2022年   182篇
  2021年   280篇
  2020年   422篇
  2019年   648篇
  2018年   913篇
  2017年   931篇
  2016年   806篇
  2015年   486篇
  2014年   745篇
  2013年   4884篇
  2012年   734篇
  2011年   761篇
  2010年   558篇
  2009年   549篇
  2008年   593篇
  2007年   567篇
  2006年   470篇
  2005年   474篇
  2004年   419篇
  2003年   403篇
  2002年   388篇
  2001年   537篇
  2000年   454篇
  1999年   407篇
  1998年   250篇
  1997年   243篇
  1996年   285篇
  1995年   257篇
  1994年   208篇
  1993年   217篇
  1992年   355篇
  1991年   335篇
  1990年   322篇
  1989年   323篇
  1988年   286篇
  1987年   327篇
  1986年   290篇
  1985年   335篇
  1984年   277篇
  1983年   230篇
  1982年   216篇
  1981年   186篇
  1980年   167篇
  1979年   282篇
  1978年   208篇
  1977年   186篇
  1976年   166篇
  1975年   155篇
  1974年   154篇
  1971年   130篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
A user study of the Index Medicus done at the Walter Reed Army Medical Center included responses from a group of sixty researchers, clinicians, residents, and interns. An analysis of the questionnaire shows that, while all respondents use the Index Medicus, most use it to search for a specific subject or a specific author reference. Comments received were critical of the delay from the time of journal publication until the appearance of its citation in Index Medicus. Suggestions were offered concerning the type of publication most of the respondents would prefer.  相似文献   
73.
74.
75.
Serials, one of the more complicated areas of library technical endeavors, has lacked the benefit of standards for a long time. Even now, with standards beginning to be available, the majority of institutions are not working within standard serials formats. A survey to determine the use of serials standards in libraries was conducted in 1988 by the American Library Association, Resources and Technical Services Division, Serials Section, Committee to Study Serials Standards. In the spring of 1988 a survey was sent to a group encompassing the Association of Research Libraries members, CONSER participants, United States Newspaper Program participants, Microform Project libraries, and some vendors and librarians who attended the Committee meetings on a regular basis. The survey questionnaire assessed the current level of serials standards awareness of librarians and vendors. Topics included the type of serials systems used, standards relevant to serials control and union listing and whether or not they are implemented, types and levels of training staff received in the application of standards, benefits of the standards, and areas where standards are most needed.  相似文献   
76.
Information access is central to library and information science, yet explorations of its conceptual nature have been limited. Given the importance of information access to the discipline, there is a need for research to create a better understanding of the concept and its many roles in all activities and behaviors related to information. Drawing on the theoretical work of Elfreda Chatman, this article proposes that the study of information access can be facilitated through the recognition and examination of the physical, intellectual, and social aspects of information access. These types of access are examined through three case studies in terms of different information behaviors and contexts, with a particular focus on the importance of social access. The article also discusses the future roles that considerations of social access can play in research and theory.  相似文献   
77.
78.
彻底简化IT     
如何实现"简化IT"的战略,这是困扰很多企业,尤其是CIO的一个重要问题。本文以日本新生银行的例子来诠释如何彻底简化IT。中世纪哲人William of Ock- ham说过,理论应该尽可能的简单。同样的原则适用于企业IT系统:它们按照尽可能少的标准  相似文献   
79.
80.
This paper discusses the evaluation of scientific activity with the help of some scientometric indices, in particular, a citation index. The information massif of the bibliographic database of citations to domestic publications of Kazakh authors is statistically described.  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