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   7031篇
  免费   116篇
  国内免费   21篇
教育   4742篇
科学研究   889篇
各国文化   44篇
体育   556篇
综合类   14篇
文化理论   44篇
信息传播   879篇
  2022年   56篇
  2021年   62篇
  2020年   111篇
  2019年   165篇
  2018年   200篇
  2017年   267篇
  2016年   217篇
  2015年   171篇
  2014年   220篇
  2013年   1158篇
  2012年   180篇
  2011年   193篇
  2010年   169篇
  2009年   138篇
  2008年   157篇
  2007年   178篇
  2006年   139篇
  2005年   101篇
  2004年   123篇
  2003年   109篇
  2002年   88篇
  2001年   126篇
  2000年   169篇
  1999年   136篇
  1998年   92篇
  1997年   77篇
  1996年   81篇
  1995年   56篇
  1994年   58篇
  1993年   46篇
  1992年   96篇
  1991年   99篇
  1990年   102篇
  1989年   95篇
  1988年   100篇
  1987年   79篇
  1986年   107篇
  1985年   108篇
  1984年   85篇
  1983年   97篇
  1982年   78篇
  1981年   62篇
  1980年   47篇
  1979年   78篇
  1978年   77篇
  1977年   56篇
  1976年   57篇
  1974年   49篇
  1973年   43篇
  1971年   44篇
排序方式: 共有7168条查询结果,搜索用时 15 毫秒
31.
We consider some issues of the development of the national information infrastructure in the field of innovation, including a national system of accounting for the results of scientific and technical activities (RSTA) and a national new-generation research computer network (NNGRCN). The current state of the national system of scientific and technical information and its resources for information support of innovation processes are analyzed. In the context of further development of the Commonwealth of Independent States (CIS), we propose a Conception of scientific and technical support for programs and projects of NIS member-states in the field of innovation, making it possible to incorporate the existing innovation-oriented information resources into a joint distributed integrated information system as well as to create new information resources and technologies.  相似文献   
32.
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   
33.
34.
The health care environment of the 1990s demands that hospital libraries develop creative strategies for providing consumer health information (CHI). Librarians at the Reuben L. Sharp Health Sciences Library at Cooper Hospital/University Medical Center have developed a multifaceted approach to the problem. Using a combination of institutional resources, private funding, and cooperative arrangements with public libraries, the Sharp Library helps to serve the consumer health information needs of the southern New Jersey community.  相似文献   
35.
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   
36.
37.
38.
39.
40.
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