全文获取类型
收费全文 | 10674篇 |
免费 | 88篇 |
国内免费 | 9篇 |
专业分类
教育 | 7148篇 |
科学研究 | 1396篇 |
各国文化 | 131篇 |
体育 | 739篇 |
综合类 | 5篇 |
文化理论 | 94篇 |
信息传播 | 1258篇 |
出版年
2020年 | 113篇 |
2019年 | 179篇 |
2018年 | 189篇 |
2017年 | 241篇 |
2016年 | 209篇 |
2015年 | 133篇 |
2014年 | 204篇 |
2013年 | 2115篇 |
2012年 | 188篇 |
2011年 | 179篇 |
2010年 | 151篇 |
2009年 | 169篇 |
2008年 | 197篇 |
2007年 | 187篇 |
2006年 | 174篇 |
2005年 | 149篇 |
2004年 | 135篇 |
2003年 | 127篇 |
2002年 | 119篇 |
2001年 | 133篇 |
2000年 | 151篇 |
1999年 | 130篇 |
1998年 | 91篇 |
1997年 | 84篇 |
1996年 | 95篇 |
1994年 | 102篇 |
1993年 | 112篇 |
1992年 | 145篇 |
1991年 | 150篇 |
1990年 | 148篇 |
1989年 | 155篇 |
1988年 | 126篇 |
1987年 | 139篇 |
1986年 | 148篇 |
1985年 | 160篇 |
1984年 | 155篇 |
1983年 | 155篇 |
1982年 | 120篇 |
1981年 | 132篇 |
1980年 | 109篇 |
1979年 | 150篇 |
1978年 | 154篇 |
1977年 | 109篇 |
1976年 | 109篇 |
1975年 | 102篇 |
1974年 | 84篇 |
1973年 | 101篇 |
1972年 | 86篇 |
1971年 | 80篇 |
1970年 | 84篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Donsbach Wolfgang; Noelle-Neumann Elisabeth; Traugott Michael W.; Worcester Robert 《Int. Journal of Public Opinion Research》2006,18(3):273-274
This issue of the Journal contains three interesting articlesabout central aspects of public opinion research, as well asan equal number of research notes that reflect the range oftopics that interest all public opinion researchers. Toshio Takeshita takes a turn at reconceptualizing agenda-settingstudies, using a taxonomy 相似文献
43.
Question classification systems play an important role in question answering systems and can be used in a wide range of other domains. The goal of question classification is to accurately assign labels to questions based on expected answer type. Most approaches in the past have relied on matching questions against hand-crafted rules. However, rules require laborious effort to create and often suffer from being too specific. Statistical question classification methods overcome these issues by employing machine learning techniques. We empirically show that a statistical approach is robust and achieves good performance on three diverse data sets with little or no hand tuning. Furthermore, we examine the role different syntactic and semantic features have on performance. We find that semantic features tend to increase performance more than purely syntactic features. Finally, we analyze common causes of misclassification error and provide insight into ways they may be overcome. 相似文献
44.
Lucretia W McClure 《Journal of the Medical Library Association》2005,93(2):197-198
45.
A rich literature exists reinforcing the notion that both perceived and received social support has stress ameliorating and protective benefits both psychologically and physiologically. However, recent literature suggests that excessive dyadic negative problem talk about an issue, a phenomenon labeled co-rumination, may reverse much of the beneficial effects of social support. Healthy young adults participated in a laboratory research study exploring the associations between co-rumination and immune system inflammatory response. Partial correlations indicated a positive association between co-rumination and C-reactive protein and a negative association between co-rumination and interleukin-6 after controlling for stress, anxiety, and temperature. Discussion focuses on the means by which co-rumination may lead to negative health outcomes. 相似文献
46.
47.
48.
49.
50.
Thinking outside of the box: the role of environmental adaptation in the acquisition of skilled and expert performance 总被引:1,自引:1,他引:0
Eccles DW 《Journal of sports sciences》2006,24(10):1103-1114