全文获取类型
收费全文 | 49515篇 |
免费 | 2022篇 |
国内免费 | 20篇 |
专业分类
51557篇 |
出版年
2020年 | 558篇 |
2019年 | 642篇 |
2018年 | 861篇 |
2017年 | 859篇 |
2016年 | 973篇 |
2015年 | 702篇 |
2014年 | 849篇 |
2013年 | 3789篇 |
2012年 | 1574篇 |
2011年 | 1543篇 |
2010年 | 1026篇 |
2009年 | 1010篇 |
2008年 | 1450篇 |
2007年 | 1429篇 |
2006年 | 1249篇 |
2005年 | 1153篇 |
2004年 | 1151篇 |
2003年 | 1037篇 |
2002年 | 1058篇 |
2001年 | 1431篇 |
2000年 | 1401篇 |
1999年 | 1055篇 |
1998年 | 566篇 |
1997年 | 483篇 |
1992年 | 972篇 |
1991年 | 903篇 |
1990年 | 918篇 |
1989年 | 809篇 |
1988年 | 809篇 |
1987年 | 782篇 |
1986年 | 792篇 |
1985年 | 877篇 |
1984年 | 694篇 |
1983年 | 628篇 |
1982年 | 470篇 |
1981年 | 466篇 |
1979年 | 783篇 |
1978年 | 521篇 |
1977年 | 494篇 |
1976年 | 497篇 |
1975年 | 641篇 |
1974年 | 738篇 |
1973年 | 767篇 |
1972年 | 650篇 |
1971年 | 614篇 |
1970年 | 584篇 |
1969年 | 576篇 |
1968年 | 766篇 |
1967年 | 675篇 |
1966年 | 598篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
Kathleen Forcier Laura R Stroud George D Papandonatos Brian Hitsman Meredith Reiches Jenelle Krishnamoorthy Raymond Niaura 《Health psychology》2006,25(6):723-739
A meta-analysis of published studies with adult human participants was conducted to evaluate whether physical fitness attenuates cardiovascular reactivity and improves recovery from acute psychological stressors. Thirty-three studies met selection criteria; 18 were included in recovery analyses. Effect sizes and moderator influences were calculated by using meta-analysis software. A fixed effects model was fit initially; however, between-studies heterogeneity could not be explained even after inclusion of moderators. Therefore, to account for residual heterogeneity, a random effects model was estimated. Under this model, fit individuals showed significantly attenuated heart rate and systolic blood pressure reactivity and a trend toward attenuated diastolic blood pressure reactivity. Fit individuals also showed faster heart rate recovery, but there were no significant differences in systolic blood pressure or diastolic blood pressure recovery. No significant moderators emerged. Results have important implications for elucidating mechanisms underlying effects of fitness on cardiovascular disease and suggest that fitness may be an important confound in studies of stress reactivity. 相似文献
42.
43.
T. J. Roper R. A. Boakes 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1981,33(2):137-140
TOATES, F. Animal Behaviour: A Systems Approach. Chichester: John Wiley and Sons. 1980. Pp. 299. Hardback £17. Paper back £6.40 ISBN 0 471 27724.
DICKINSON, A. Contemporary Animal Learning Theory. Cambridge: University Press. 1980. Pp. 177. Hardback £12.50. Paperback £3.95. ISBN 0 521 23469 7. 相似文献
DICKINSON, A. Contemporary Animal Learning Theory. Cambridge: University Press. 1980. Pp. 177. Hardback £12.50. Paperback £3.95. ISBN 0 521 23469 7. 相似文献
44.
Michael K. Tanenhaus Suzanne Donnenwerth-Nolan 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》1984,36(4):649-661
Recent studies demonstrating that multiple meanings of an ambiguous word are initially accessed even when only one reading is syntactically appropriate with the preceding context can be criticized on at least two grounds. First, many of the syntactic contexts used were not truly restrictive, and, secondly, subjects may not have had time to integrate the context before processing the ambiguous word. In the present study, subjects listened to a sentence ending in an ambiguous word and then made a lexical decision to a target related to either the appropriate or inappropriate reading. Contexts were completely restrictive, and a pause was introduced between the context and the ambiguous word. Multiple access still obtained, providing further support for the claim that lexical access is not guided by syntactic context. 相似文献
45.
46.
47.
Informed by theory and research on attributions and narrative persuasion, we compared the effectiveness of narrative and nonnarrative messages in changing attributions of responsibility for causes and solutions related to obesity in the United States. We randomly assigned 500 adults to view one of three messages (narrative, evidence, and a hybrid of the two) emphasizing environmental causes of obesity, or a no‐exposure control condition. The narrative condition increased the belief that societal actors (government, employers) are responsible for addressing obesity, but only among liberals. This pattern of results was partially explained by the success of the narrative condition in reducing reactive counterarguing, relative to the evidence condition, among liberals. We conclude with theoretical and practical implications. 相似文献
48.
49.
50.