全文获取类型
| 收费全文 | 27432篇 |
| 免费 | 410篇 |
| 国内免费 | 32篇 |
专业分类
| 教育 | 19678篇 |
| 科学研究 | 2729篇 |
| 各国文化 | 228篇 |
| 体育 | 1958篇 |
| 综合类 | 34篇 |
| 文化理论 | 309篇 |
| 信息传播 | 2938篇 |
出版年
| 2022年 | 134篇 |
| 2021年 | 253篇 |
| 2020年 | 392篇 |
| 2019年 | 571篇 |
| 2018年 | 1386篇 |
| 2017年 | 1417篇 |
| 2016年 | 1173篇 |
| 2015年 | 504篇 |
| 2014年 | 648篇 |
| 2013年 | 4645篇 |
| 2012年 | 659篇 |
| 2011年 | 929篇 |
| 2010年 | 781篇 |
| 2009年 | 629篇 |
| 2008年 | 744篇 |
| 2007年 | 801篇 |
| 2006年 | 472篇 |
| 2005年 | 479篇 |
| 2004年 | 516篇 |
| 2003年 | 424篇 |
| 2002年 | 420篇 |
| 2001年 | 442篇 |
| 2000年 | 427篇 |
| 1999年 | 422篇 |
| 1998年 | 230篇 |
| 1997年 | 253篇 |
| 1996年 | 272篇 |
| 1995年 | 226篇 |
| 1994年 | 228篇 |
| 1993年 | 212篇 |
| 1992年 | 326篇 |
| 1991年 | 324篇 |
| 1990年 | 350篇 |
| 1989年 | 336篇 |
| 1988年 | 319篇 |
| 1987年 | 264篇 |
| 1986年 | 280篇 |
| 1985年 | 345篇 |
| 1984年 | 293篇 |
| 1983年 | 274篇 |
| 1982年 | 220篇 |
| 1981年 | 219篇 |
| 1980年 | 194篇 |
| 1979年 | 259篇 |
| 1978年 | 229篇 |
| 1977年 | 198篇 |
| 1976年 | 162篇 |
| 1975年 | 124篇 |
| 1974年 | 119篇 |
| 1973年 | 145篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
101.
102.
103.
104.
105.
106.
107.
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
108.
109.
D A Kronick 《Bulletin of the Medical Library Association》1979,67(3):297-301
A cooperative acquisition program for monographs for the twelve resource libraries in Region IX of the Regional Medical Library Network is described. Each of the participating libraries has agreed to purchase all books of an assigned publisher which fall within a prescribed subject-format profile. It is hoped that this will help to reduce unnecessary duplication and contribute toward the development of resources in the region. 相似文献
110.