全文获取类型
收费全文 | 16920篇 |
免费 | 217篇 |
国内免费 | 13篇 |
专业分类
教育 | 11882篇 |
科学研究 | 1340篇 |
各国文化 | 188篇 |
体育 | 1582篇 |
综合类 | 23篇 |
文化理论 | 111篇 |
信息传播 | 2024篇 |
出版年
2021年 | 143篇 |
2020年 | 246篇 |
2019年 | 358篇 |
2018年 | 420篇 |
2017年 | 503篇 |
2016年 | 457篇 |
2015年 | 303篇 |
2014年 | 411篇 |
2013年 | 3101篇 |
2012年 | 353篇 |
2011年 | 392篇 |
2010年 | 309篇 |
2009年 | 360篇 |
2008年 | 348篇 |
2007年 | 331篇 |
2006年 | 289篇 |
2005年 | 289篇 |
2004年 | 541篇 |
2003年 | 407篇 |
2002年 | 420篇 |
2001年 | 285篇 |
2000年 | 305篇 |
1999年 | 248篇 |
1998年 | 132篇 |
1997年 | 156篇 |
1996年 | 193篇 |
1995年 | 168篇 |
1994年 | 165篇 |
1993年 | 154篇 |
1992年 | 217篇 |
1991年 | 209篇 |
1990年 | 191篇 |
1989年 | 231篇 |
1988年 | 192篇 |
1987年 | 218篇 |
1986年 | 194篇 |
1985年 | 246篇 |
1984年 | 205篇 |
1983年 | 190篇 |
1982年 | 164篇 |
1981年 | 145篇 |
1980年 | 121篇 |
1979年 | 182篇 |
1978年 | 146篇 |
1977年 | 128篇 |
1976年 | 148篇 |
1975年 | 112篇 |
1974年 | 126篇 |
1973年 | 98篇 |
1971年 | 115篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
Indexing consistency in MEDLINE 总被引:3,自引:0,他引:3
The quality of indexing of periodicals in a bibliographic data base cannot be measured directly, as there is no one "correct" way to index an item. However, consistency can be used to measure the reliability of indexing. To measure consistency in MEDLINE, 760 twice-indexed articles from 42 periodical issues were identified in the data base, and their indexing compared. Consistency, expressed as a percentage, was measured using Hooper's equation. Overall, checktags had the highest consistency. Medical Subject Headings (MeSH) and subheadings were applied more consistently to central concepts than to peripheral points. When subheadings were added to a main heading, consistency was lowered. "Floating" subheadings were more consistent than were attached subheadings. Indexing consistency was not affected by journal indexing priority, language, or length of the article. Terms from MeSH Tree Structure categories A, B, and D appeared more often than expected in the high-consistency articles; whereas terms from categories E, F, H, and N appeared more often than expected in the low-consistency articles. MEDLINE, with its excellent controlled vocabulary, exemplary quality control, and highly trained indexers, probably represents the state of the art in manually indexed data bases. 相似文献
52.
53.
54.
55.
56.
This paper describes the procedures used at the Library of the College of Physicians of Philadelphia to divide its ninety-year-old dictionary card catalog. The division was necessitated by overcrowding, obsolete subject headings, and lack of a complete authority list which resulted in like materials being scattered throughout the catalog under several headings. Two catalogs were created: the historical-biographical catalog, representing all works published before 1950 and all works of historical or biographical nature; and the current catalog, containing all works published from 1950 on, excepting historical or biographical materials. The 1950- catalog was further divided into name and subject catalogs, and the subject section was revised according to MeSH. The project was completed in about two years. As a result, searching time has been much reduced, and the library is able to take advantage of the annual revisions of MeSH to update the subject catalog. 相似文献
57.
Karyn Ogata Jones Bryan E. Denham Jeffrey K. Springston 《Journal of Applied Communication Research》2006,34(1):94-113
Drawing on components of agenda-setting theory and the two-step flow of information from mass media to news audiences, this study examines the effects of mass and interpersonal communication on breast cancer screening practices among college- and middle-aged women (n = 284). We theorized that screening behaviors among younger women would be influenced more by interpersonal sources of information while screening among middle-aged women would be more influenced by exposure to mass-mediated information. Findings supported anticipated patterns, revealing important and varying roles for both mass and interpersonal communication in the health behaviors of women. Implications for health practitioners and campaign planners, as well as recommendations for future research, are discussed. 相似文献
58.
59.
Susan Xue 《Journal of Government Information》2004,30(1):87-109
As the People's Republic of China plays an increasingly important role in international politics and trade, countries with economic interests there find they need to know more about this nation. Access to primary information sources, including official statistics from China, however, is very limited, as little exploration has been done into this closely controlled repository of information. This study explores major current statistical sources in China through examining (a) the statistical system in Chinese government, (b) the mechanism of statistical data collection, and (c) what statistical information is currently available in both print and electronic format and at what level. It shows that a wealth of statistical information does exist in China, it is systematically compiled, and it is available, although not conveniently, to the public through various channels. This study can serve the need for China's data from the academic and business communities, contribute to a better understanding of China's statistical system, and serve as a collection tool for academic, public, and corporation libraries as well. 相似文献
60.
Library as place: results of a delphi study. 总被引:1,自引:0,他引:1
OBJECTIVE: An expert consensus on the future of the library as place was developed to assist health sciences librarians in designing new library spaces. METHOD: An expert panel of health sciences librarians, building consultants, architects, and information technologists was asked to reflect on the likelihood, desirability, timing, and impact on building design of more than seventy possible changes in the use of library space. RESULTS: An expert consensus predicted that the roles librarians play and the way libraries are used will substantially change. These changes come in response to changes in technology, scholarly communication, learning environments, and the health care economy. CONCLUSIONS: How health sciences library space is used will be far less consistent by 2015, as space becomes more tailored to institutional needs. However, the manner in which health sciences libraries develop and deliver services and collections will drastically change in the next decade. Libraries will continue to exist and will provide support for knowledge management and clinical trials, provide access to digital materials, and play a host of other roles that will enable libraries to emerge as institutional change agents. 相似文献