全文获取类型
收费全文 | 43677篇 |
免费 | 1770篇 |
国内免费 | 14篇 |
专业分类
45461篇 |
出版年
2020年 | 502篇 |
2019年 | 658篇 |
2018年 | 863篇 |
2017年 | 860篇 |
2016年 | 923篇 |
2015年 | 642篇 |
2014年 | 833篇 |
2013年 | 3606篇 |
2012年 | 1484篇 |
2011年 | 1531篇 |
2010年 | 984篇 |
2009年 | 978篇 |
2008年 | 1411篇 |
2007年 | 1390篇 |
2006年 | 1276篇 |
2005年 | 1137篇 |
2004年 | 1156篇 |
2003年 | 1028篇 |
2002年 | 1053篇 |
2001年 | 1186篇 |
2000年 | 1104篇 |
1999年 | 887篇 |
1998年 | 549篇 |
1997年 | 459篇 |
1996年 | 406篇 |
1995年 | 416篇 |
1992年 | 665篇 |
1991年 | 634篇 |
1990年 | 628篇 |
1989年 | 630篇 |
1988年 | 637篇 |
1987年 | 591篇 |
1986年 | 598篇 |
1985年 | 666篇 |
1984年 | 559篇 |
1983年 | 523篇 |
1982年 | 451篇 |
1981年 | 436篇 |
1979年 | 614篇 |
1978年 | 478篇 |
1976年 | 444篇 |
1975年 | 490篇 |
1974年 | 559篇 |
1973年 | 561篇 |
1972年 | 441篇 |
1971年 | 416篇 |
1969年 | 422篇 |
1968年 | 503篇 |
1967年 | 432篇 |
1966年 | 425篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Suicides among older adults in the United States and Canada in the last decade have accounted for an increasing share of all suicides. In both countries the use of firearms among older adults has steadily increased. Despite these trends, little is known about the extent to which crisis centers are prepared to prevent elder suicide. A survey of AAS-listed crisis prevention centers examined the training, knowledge, and current practices relevant to elder suicide among personnel in 321 crisis prevention centers in both countries. Results revealed insufficient training, a lack of familiarity with recent suicide trends, and limited outreach to older adults. 相似文献
42.
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
43.
44.
45.
46.
47.
48.
49.
Judith Volmer Cornelia Niessen Daniel Spurk Alexandra Linz Andrea E. Abele 《Psychologie appliquee》2011,60(4):522-545
While previous research has mainly emphasised the importance of leader–member exchange (LMX) to job satisfaction, there is a lack of research on reciprocal relationships between job satisfaction and LMX. In this study, we not only suggest that good LMX increases job satisfaction, but that job satisfaction can also enhance high‐quality supervisor–employee relationships. A full cross‐lagged panel analysis was used to test reciprocal relationships between LMX and job satisfaction. Employees (N= 279) of a large information technology company filled out questionnaires at two times, with a time lag of 3 months. In line with our predictions, findings revealed a positive relationship between LMX and job satisfaction both at Time 1 and Time 2. Moreover, LMX at Time 1 predicted the increase of job satisfaction at Time 2, and job satisfaction at Time 1 predicted the increase of LMX at Time 2. The results demonstrate the need to consider reciprocal relationships between job satisfaction and LMX when explaining employees' workplace outcomes. Our findings are discussed in terms of positive psychology theory. 相似文献
50.