全文获取类型
收费全文 | 14563篇 |
免费 | 174篇 |
国内免费 | 12篇 |
专业分类
教育 | 9894篇 |
科学研究 | 1310篇 |
各国文化 | 153篇 |
体育 | 1511篇 |
综合类 | 22篇 |
文化理论 | 104篇 |
信息传播 | 1755篇 |
出版年
2021年 | 110篇 |
2020年 | 210篇 |
2019年 | 299篇 |
2018年 | 346篇 |
2017年 | 415篇 |
2016年 | 364篇 |
2015年 | 238篇 |
2014年 | 319篇 |
2013年 | 2615篇 |
2012年 | 280篇 |
2011年 | 320篇 |
2010年 | 251篇 |
2009年 | 283篇 |
2008年 | 268篇 |
2007年 | 261篇 |
2006年 | 244篇 |
2005年 | 226篇 |
2004年 | 468篇 |
2003年 | 357篇 |
2002年 | 384篇 |
2001年 | 246篇 |
2000年 | 260篇 |
1999年 | 204篇 |
1998年 | 99篇 |
1997年 | 123篇 |
1996年 | 151篇 |
1995年 | 138篇 |
1994年 | 130篇 |
1993年 | 126篇 |
1992年 | 179篇 |
1991年 | 180篇 |
1990年 | 165篇 |
1989年 | 215篇 |
1988年 | 176篇 |
1987年 | 207篇 |
1986年 | 179篇 |
1985年 | 232篇 |
1984年 | 191篇 |
1983年 | 173篇 |
1982年 | 152篇 |
1981年 | 129篇 |
1980年 | 110篇 |
1979年 | 173篇 |
1978年 | 137篇 |
1977年 | 121篇 |
1976年 | 139篇 |
1975年 | 103篇 |
1974年 | 118篇 |
1973年 | 96篇 |
1971年 | 107篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
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
43.
44.
45.
46.
47.
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
48.
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
49.
50.
David E. Hubbard Sierra Laddusaw Joel Kitchens Rusty Kimball 《The Journal of Academic Librarianship》2018,44(3):404-411
Academic libraries are increasingly seeking ways to demonstrate their impact on student learning. Acknowledgments - formal statements of indebtedness – in graduate theses and dissertations provide a rather unexplored area for demonstrating impact of the academic library on student learning. This study uses quantitative and qualitative methods to characterize acknowledgments of the Texas A&M University Libraries (TAMU Libraries) in theses and dissertations, both overall and for three disciplines specifically: civil engineering, geography, and history. This study also searched for mentions of the TAMU Libraries throughout the entire body of theses and dissertations. Overall, acknowledgments to the TAMU Libraries in theses and dissertations were less than 1%, though acknowledgments were found in all three disciplines with over a quarter of the history theses and dissertations containing an acknowledgment to libraries. There was no statistically significant difference found between the numbers of acknowledgments in theses versus dissertations. Acknowledgments to the TAMU Libraries were found in the theses and dissertations of 28 different departments. Mentions to the TAMU Libraries – not necessarily a formal acknowledgment – were found throughout the text of theses and dissertations with most concentrated in the acknowledgment, method, and bibliography sections. 相似文献