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   33278篇
  免费   291篇
  国内免费   59篇
教育   24783篇
科学研究   2780篇
各国文化   281篇
体育   1848篇
综合类   47篇
文化理论   513篇
信息传播   3376篇
  2021年   213篇
  2020年   273篇
  2019年   450篇
  2018年   2717篇
  2017年   2732篇
  2016年   2166篇
  2015年   540篇
  2014年   655篇
  2013年   4625篇
  2012年   775篇
  2011年   1301篇
  2010年   1359篇
  2009年   922篇
  2008年   1177篇
  2007年   1666篇
  2006年   570篇
  2005年   836篇
  2004年   813篇
  2003年   704篇
  2002年   442篇
  2001年   422篇
  2000年   372篇
  1999年   302篇
  1998年   209篇
  1997年   233篇
  1996年   232篇
  1995年   201篇
  1994年   214篇
  1993年   199篇
  1992年   268篇
  1991年   279篇
  1990年   302篇
  1989年   285篇
  1988年   231篇
  1987年   237篇
  1986年   249篇
  1985年   225篇
  1984年   235篇
  1983年   238篇
  1982年   188篇
  1981年   192篇
  1980年   192篇
  1979年   241篇
  1978年   227篇
  1977年   163篇
  1976年   163篇
  1975年   152篇
  1974年   132篇
  1973年   141篇
  1971年   146篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Fielding H. Garrison's paper "The medical periodical and the scientific society" cited the Buffalo Medical Journal in the company of eminent periodicals published in Berlin, Boston, and Edinburgh. This article provides an overview of the Journal and places it in context of 19th-century medical journalism. The Journal is assessed in terms of original scientific contributions and as a source of social and local history.  相似文献   
82.
83.
This paper supplements information given in earlier papers on the UCLA MEDLARS Search Station. Four major machine problem areas in the operation of a decentralized station are identified: adjustments required to run a large information retrieval type program in an academic computing facility serving many users; handicap in running time for COBOL programs; advent of the third generation of computers with attendant preparation; and need for constant current communication among all members of a decentralized network system. Statistics are given for the initial operating period, January-May 1966: 119 search requests received, 109 formulated, and 60 fully processed. Parallel searches with other MEDLARS installations, comparisons of MEDLARS and manual Index Medicus searches, and other search activities are reported.  相似文献   
84.
Adequate research in the peripheral field of medical geography requires familiarity with the literature of medicine, geography, and other environmentally oriented fields. The pertinent literature of the two primary disciplines, as well as that of anthropology, nutrition, and human bioclimatology, is surveyed from a bibliographical point of view. A brief review of historical sources is presented, followed by a discussion of the contemporary organizations, both international and national, active in the field. Emphasis is placed on the publishing programs and projects, maps, atlases, symposia, reports, and other literature sponsored or stimulated by these organizations. Regional bibliographical surveys for East Africa, India, and the Soviet Union are also noted. Pertinent aspects of bibliographies, indexes, abstracts, library card catalogs and accession lists, and other resources are listed, with emphasis on the various subject headings and other approaches to them. Throughout, the sources of information are approached from a multidisciplinary and interdisciplinary viewpoint.  相似文献   
85.
86.
87.
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   
88.
89.
Physician information seeking: improving relevance through research   总被引:1,自引:0,他引:1  
Health sciences libraries have considerable potential as resources for both formal continuing professional education, as well as the informal continuing education that results from the professional's efforts to solve problems in daily practice. While there is a growing interest in making the resources of health sciences libraries more accessible to practitioners on a routine, day-to-day basis, there also needs to be more awareness of how, when, where, and why professionals look for information in the context of practical problems. This paper reviews recent research that identifies the context in which physicians seek information and advice from external sources, the information sources that physicians access, and the factors that influence which particular sources are sought. The results indicate that physicians vary in their information needs, preferences, motivations, and strategies for seeking information. This diversity suggests that health sciences libraries, in their efforts to be more accessible, should consider "market research" to determine the needs, preferences, and use patterns of the library's targeted users. Libraries may also benefit from exploring alternative methods of improving access to their resources.  相似文献   
90.
The ‘traditional’ academic library system model – i.e. a central system constructed around a common catalogue record that also dictated the end‐users' view – is breaking down. Systems that were constructed to handle the processing and lending of printed items are no longer capable, on their own, of dealing with the variety of different information resources handled by modern academic libraries. A great deal has been written about how end‐users expect more ‘Web 2.0’ features than library catalogues currently provide. New front‐end services have been designed by libraries and library system providers to cater for this need. However, not much has been written about the needs of internal library staff who struggle with processing, handling, and supporting the huge volume of electronic resources subscribed to by libraries. Electronic resource management systems have been developed to cater for these needs, and new standards for data interchange with such systems have been developed. Just as standards were important in encouraging electronic data interchange (orders, invoices, claims, etc.) between libraries, publishers, and agents in the last century, so new standards are evolving for such transactions in the electronic era.  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