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   34765篇
  免费   400篇
  国内免费   16篇
教育   25420篇
科学研究   3236篇
各国文化   223篇
体育   2253篇
综合类   13篇
文化理论   563篇
信息传播   3473篇
  2022年   176篇
  2021年   264篇
  2020年   383篇
  2019年   626篇
  2018年   2919篇
  2017年   2823篇
  2016年   2250篇
  2015年   561篇
  2014年   784篇
  2013年   4680篇
  2012年   882篇
  2011年   1375篇
  2010年   1324篇
  2009年   915篇
  2008年   1181篇
  2007年   1634篇
  2006年   501篇
  2005年   797篇
  2004年   834篇
  2003年   725篇
  2002年   481篇
  2001年   487篇
  2000年   420篇
  1999年   372篇
  1998年   212篇
  1997年   225篇
  1996年   247篇
  1995年   240篇
  1994年   183篇
  1993年   205篇
  1992年   327篇
  1991年   312篇
  1990年   305篇
  1989年   303篇
  1988年   260篇
  1987年   308篇
  1986年   269篇
  1985年   309篇
  1984年   250篇
  1983年   214篇
  1982年   195篇
  1981年   170篇
  1980年   155篇
  1979年   263篇
  1978年   192篇
  1977年   171篇
  1976年   157篇
  1975年   144篇
  1974年   152篇
  1971年   144篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
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   
92.
93.
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   
94.
95.
The necessity for publishing a separate abstract journal on spintronics, which is a new, rapidly developing branch of physics, is substantiated. The interest in spintronics, which is the study of fundamental processes involving the simultaneous transport of both electron charge and electron spins in solids, as well as the interaction of electrons with a magnetic grating, is determined not only by its fascinating prospects but also the results that have already achieved. The spin and charge “degrees of freedom” open possibilities for the creation of semiconducting devices with parameters that are much superior to the existing ones and also the construction of devices that do not have analogues at present. First of all, this will permit problems of information transmission and processing to be solved in a new way. A detailed rubrication on spintronics is given in order to discuss the possibility of publishing a separate edition of an abstract journal devoted to spintronics.  相似文献   
96.
The use of rural sites to train badly needed primary care providers requires access to sophisticated medical information not traditionally available outside of academic health centers. Medical reference librarians can play a key role in the development of primary care training sites in rural settings. Electronic information technologies, with proactive support from medical reference librarians, can provide current and detailed information without concern for distance from the health science center library. This paper discusses recent developments in technology, describes current challenges to the application of this technology in rural settings, and provides policy recommendations for medical reference librarians to enhance rural primary care training.  相似文献   
97.
In 1991, the Reference and Information Services staff of the Alfred Taubman Medical Library at the University of Michigan gathered data on the use of the reference desk, including the frequency and types of assistance requested by different user groups throughout the year. Recommendations based on the results of this study led to improved service as well as more efficient use of staff resources.  相似文献   
98.
The purpose of the study was to identify the pattern of publication about women and AIDS in scientific journals. Bradford zones were identified in each of six databases. The study determined that journal scatter for this subset of AIDS literature differed from the scatter in the general literature; further, the information indexed in the six electronic sources demonstrated little overlap. Consequently, key journal and newsletter titles identified by this study should form the core of any collection focusing on women and AIDS. The assurance of quality patient care management demands that librarians consult multiple resources for information retrieval that can assist health care providers, patients, and caregivers to enhance quality of life as well as to provide optimum care.  相似文献   
99.
100.
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