首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   58949篇
  免费   1558篇
  国内免费   13篇
  60520篇
  2019年   508篇
  2018年   3979篇
  2017年   3354篇
  2016年   2875篇
  2015年   709篇
  2014年   703篇
  2013年   3133篇
  2012年   1727篇
  2011年   3531篇
  2010年   3153篇
  2009年   2227篇
  2008年   2775篇
  2007年   3189篇
  2006年   1087篇
  2005年   1173篇
  2004年   1109篇
  2003年   1038篇
  2002年   979篇
  2001年   1147篇
  2000年   1075篇
  1999年   843篇
  1998年   491篇
  1997年   434篇
  1996年   417篇
  1992年   639篇
  1991年   617篇
  1990年   600篇
  1989年   610篇
  1988年   604篇
  1987年   584篇
  1986年   592篇
  1985年   657篇
  1984年   555篇
  1983年   539篇
  1982年   452篇
  1981年   431篇
  1979年   620篇
  1978年   485篇
  1977年   409篇
  1976年   468篇
  1975年   512篇
  1974年   576篇
  1973年   588篇
  1972年   464篇
  1971年   424篇
  1970年   411篇
  1969年   438篇
  1968年   528篇
  1967年   453篇
  1966年   444篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
A growing literature has observed a significant reduction in pain sensitivity among hypertensive animals and humans. It is uncertain whether a reduced sensitivity to pain can be observed in nonnotensive individuals who go on to develop high blood pressure. Blood pressure (BP) was reassessed in one hundred fifteen 19-year-old boys initially tested at age 14, when they were also presented with a pain stimulus (mechanical finger pressure). Hierarchical regression analyses indicated that information regarding pain tolerance improved prediction of changes in systolic and diastolic blood pressure beyond that afforded by differences in BP at age 14, parental history of hypertension, and body mass index. These analyses suggest that pain sensitivity may be associated with physiological processes involved in the development of sustained high blood pressure.  相似文献   
42.
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   
43.
44.
45.
46.
47.
48.
49.
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.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号