全文获取类型
收费全文 | 26703篇 |
免费 | 333篇 |
国内免费 | 64篇 |
专业分类
教育 | 18584篇 |
科学研究 | 3156篇 |
各国文化 | 252篇 |
体育 | 1956篇 |
综合类 | 46篇 |
文化理论 | 156篇 |
信息传播 | 2950篇 |
出版年
2021年 | 273篇 |
2020年 | 358篇 |
2019年 | 561篇 |
2018年 | 754篇 |
2017年 | 767篇 |
2016年 | 678篇 |
2015年 | 460篇 |
2014年 | 634篇 |
2013年 | 5204篇 |
2012年 | 660篇 |
2011年 | 653篇 |
2010年 | 573篇 |
2009年 | 552篇 |
2008年 | 556篇 |
2007年 | 563篇 |
2006年 | 546篇 |
2005年 | 501篇 |
2004年 | 376篇 |
2003年 | 378篇 |
2002年 | 354篇 |
2001年 | 509篇 |
2000年 | 438篇 |
1999年 | 375篇 |
1998年 | 234篇 |
1997年 | 245篇 |
1996年 | 272篇 |
1995年 | 214篇 |
1994年 | 247篇 |
1993年 | 230篇 |
1992年 | 332篇 |
1991年 | 343篇 |
1990年 | 360篇 |
1989年 | 356篇 |
1988年 | 284篇 |
1987年 | 288篇 |
1986年 | 332篇 |
1985年 | 312篇 |
1984年 | 301篇 |
1983年 | 289篇 |
1982年 | 211篇 |
1981年 | 204篇 |
1980年 | 195篇 |
1979年 | 282篇 |
1978年 | 240篇 |
1977年 | 186篇 |
1976年 | 202篇 |
1975年 | 167篇 |
1974年 | 180篇 |
1973年 | 172篇 |
1971年 | 187篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
V H Holtz 《Journal of the Medical Library Association》1986,74(4):305-314
Questions concerning some of the values we hold as librarians and the goals, standards, and other evaluation tools we derive from them are discussed in the context of the history of our profession and the present period of rapid change. The concepts of stable and changing paradigms and of "scientific communities" provide the foundation for consideration of how a changing conceptual framework can affect values and their application in the evaluation process. One of many possible scenarios for the future is briefly outlined to demonstrate how some traditional values may fare. 相似文献
73.
74.
L Sentz 《Bulletin of the Medical Library Association》1985,73(3):278-282
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
75.
76.
This article reports the results of a survey of literature on measures of library effectiveness. This survey led to the formulation of six criterion concepts (accessibility, cost, user satisfaction, response time, cost/benefit ratio, and use). The advantages and disadvantages of each method of measurement are discussed. Several points which became clear during the analysis are discussed. First, there is a relative lack of concern with the rationale behind the evaluation process, although the results invariably lead to a confused interpretation when there is no clear understanding of the purpose of an evaluation. Second, the total library system is rarely considered; instead, each evaluation criterion is taken in isolation rather than as part of the whole. Third, the library's preservation function has not been considered at all. 相似文献
77.
78.
L Darling 《Bulletin of the Medical Library Association》1966,54(4):311-315
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
79.
L S Mullins 《Bulletin of the Medical Library Association》1966,54(3):230-242
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
80.
Since a sizeable hospital must have a library, it must have a library committee. Like all hospital committees, this one is to help maintain standards of medical care and to mediate between staff and administration. Unlike others, it clusters around one elected member (the chairman) and one employee (the librarian). A dynamic librarian can, and should, influence and inspire the committee's deliberations; and must be able to depend upon the support of the physician members of the committee. 相似文献