全文获取类型
收费全文 | 26273篇 |
免费 | 428篇 |
国内免费 | 16篇 |
专业分类
教育 | 18693篇 |
科学研究 | 2428篇 |
各国文化 | 258篇 |
体育 | 2125篇 |
综合类 | 15篇 |
文化理论 | 223篇 |
信息传播 | 2975篇 |
出版年
2022年 | 194篇 |
2021年 | 295篇 |
2020年 | 437篇 |
2019年 | 710篇 |
2018年 | 975篇 |
2017年 | 940篇 |
2016年 | 825篇 |
2015年 | 494篇 |
2014年 | 755篇 |
2013年 | 5190篇 |
2012年 | 701篇 |
2011年 | 723篇 |
2010年 | 545篇 |
2009年 | 541篇 |
2008年 | 617篇 |
2007年 | 552篇 |
2006年 | 478篇 |
2005年 | 455篇 |
2004年 | 412篇 |
2003年 | 398篇 |
2002年 | 379篇 |
2001年 | 500篇 |
2000年 | 433篇 |
1999年 | 400篇 |
1998年 | 240篇 |
1997年 | 232篇 |
1996年 | 267篇 |
1995年 | 259篇 |
1994年 | 210篇 |
1993年 | 233篇 |
1992年 | 350篇 |
1991年 | 331篇 |
1990年 | 328篇 |
1989年 | 333篇 |
1988年 | 284篇 |
1987年 | 324篇 |
1986年 | 294篇 |
1985年 | 340篇 |
1984年 | 277篇 |
1983年 | 240篇 |
1982年 | 223篇 |
1981年 | 181篇 |
1980年 | 179篇 |
1979年 | 285篇 |
1978年 | 207篇 |
1977年 | 189篇 |
1976年 | 174篇 |
1975年 | 157篇 |
1974年 | 160篇 |
1971年 | 155篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
O. P. Morozova 《Scientific and Technical Information Processing》2008,35(3):153-154
The web coverage of the research activities of the VINITI RAS is considered. The practicability of using various information retrieval systems for obtaining information relevant to the Institute’s functioning and results is analyzed. 相似文献
83.
N. M. Builova E. M. Epshtein V. G. Shamaev 《Scientific and Technical Information Processing》2008,35(1):28-29
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
84.
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
85.
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
86.
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
87.
88.
89.
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
90.