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   24363篇
  免费   429篇
  国内免费   16篇
教育   17359篇
科学研究   2140篇
各国文化   238篇
体育   2151篇
综合类   13篇
文化理论   224篇
信息传播   2683篇
  2022年   189篇
  2021年   320篇
  2020年   464篇
  2019年   765篇
  2018年   992篇
  2017年   967篇
  2016年   838篇
  2015年   517篇
  2014年   736篇
  2013年   4860篇
  2012年   700篇
  2011年   702篇
  2010年   520篇
  2009年   512篇
  2008年   560篇
  2007年   508篇
  2006年   453篇
  2005年   430篇
  2004年   380篇
  2003年   372篇
  2002年   351篇
  2001年   490篇
  2000年   403篇
  1999年   370篇
  1998年   210篇
  1997年   217篇
  1996年   249篇
  1995年   244篇
  1994年   189篇
  1993年   208篇
  1992年   328篇
  1991年   288篇
  1990年   297篇
  1989年   282篇
  1988年   241篇
  1987年   293篇
  1986年   261篇
  1985年   295篇
  1984年   238篇
  1983年   200篇
  1982年   176篇
  1981年   158篇
  1980年   137篇
  1979年   244篇
  1978年   178篇
  1977年   157篇
  1976年   141篇
  1975年   131篇
  1974年   135篇
  1971年   119篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
81.
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   
82.
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   
83.
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   
84.
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   
85.
86.
87.
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   
88.
89.
Burgen M 《Ebony》1978,33(6):127-30, 132, 134 passim
  相似文献   
90.
Hospital physicians naturally require current medical information in order to treat their patients. An objectively obtained SDILINE storesearch was devised to obtain this information. A rank-ordered list of hospital discharge diagnoses, coded with ICDA terms, was translated into MeSH. The top two Bradford zones of journals defined as useful at the University of Missouri--Kansas City were ANDed to these MeSH terms. Citations retrieved from the storesearch are input into an in-house computerized data base. The method can be easily used by other medical or hospital libraries without access to computers.  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