全文获取类型
收费全文 | 29857篇 |
免费 | 454篇 |
国内免费 | 74篇 |
专业分类
教育 | 21558篇 |
科学研究 | 2646篇 |
各国文化 | 302篇 |
体育 | 2304篇 |
综合类 | 50篇 |
文化理论 | 182篇 |
信息传播 | 3343篇 |
出版年
2021年 | 307篇 |
2020年 | 428篇 |
2019年 | 642篇 |
2018年 | 871篇 |
2017年 | 910篇 |
2016年 | 849篇 |
2015年 | 557篇 |
2014年 | 772篇 |
2013年 | 5704篇 |
2012年 | 730篇 |
2011年 | 765篇 |
2010年 | 664篇 |
2009年 | 618篇 |
2008年 | 687篇 |
2007年 | 624篇 |
2006年 | 648篇 |
2005年 | 563篇 |
2004年 | 483篇 |
2003年 | 451篇 |
2002年 | 403篇 |
2001年 | 771篇 |
2000年 | 572篇 |
1999年 | 478篇 |
1998年 | 275篇 |
1997年 | 306篇 |
1996年 | 301篇 |
1995年 | 250篇 |
1994年 | 298篇 |
1993年 | 247篇 |
1992年 | 385篇 |
1991年 | 371篇 |
1990年 | 406篇 |
1989年 | 397篇 |
1988年 | 331篇 |
1987年 | 327篇 |
1986年 | 344篇 |
1985年 | 369篇 |
1984年 | 332篇 |
1983年 | 312篇 |
1982年 | 252篇 |
1981年 | 262篇 |
1980年 | 237篇 |
1979年 | 345篇 |
1978年 | 284篇 |
1977年 | 227篇 |
1976年 | 209篇 |
1975年 | 210篇 |
1974年 | 198篇 |
1973年 | 204篇 |
1971年 | 209篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
This study explores faculty deposits in institutional repositories (IR) within selected disciplines and identifies the diverse navigational paths to IR sites from library Web site homepages. The statistical relationship between the development of an IR and the presence of a Web site dedicated to the reform of traditional scholarly communication is also explored. The implications for the development of institutional repositories are highlighted. 相似文献
113.
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
114.
Spang L 《Medical reference services quarterly》1995,14(1):33-44
Devising a coherent serials retrenchment plan while maintaining quality reference service is a dilemma faced by increasing numbers of medical librarians. In 1991, the staff of the Shiffman Medical Library, Wayne State University, began to address increasing serials budget reductions that by 1994 amounted to a projected 20% maximum cut. The resulting retrenchment plan combined an ongoing serials use study, faculty and librarian reviews of cancellation lists, and systematic refinements in interlibrary cooperation and document delivery service. The Shiffman plan provides a constructive framework that can be adapted to other medical libraries facing immediate, major serials retrenchment. 相似文献
115.
116.
Elliott CA 《美国档案工作者》1994,57(3):448-460
This paper explores surviving documentation and what it reveals about the underlying social structure and relations in a historic time and place. The mid-nineteenth century is chosen as a period prior to modern bureaucracies so that documents are not found in defining filing systems. Some six hundred documents are studied individually and characterized collectively. They are examined not to tell a story, however, but for evidence of their creation and maintenance and of their physical types, functional characteristics, and relations between authors and recipients. The study reveals the fruitfulness of such an orientation to documents, which complements traditional historical uses that emphasize document content. 相似文献
117.
118.
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
119.
McCarthy LH 《Medical reference services quarterly》1996,15(4):63-71
120.
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