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   48323篇
  免费   2062篇
  国内免费   22篇
  50407篇
  2020年   525篇
  2019年   661篇
  2018年   898篇
  2017年   929篇
  2016年   942篇
  2015年   688篇
  2014年   822篇
  2013年   3664篇
  2012年   1526篇
  2011年   1662篇
  2010年   979篇
  2009年   944篇
  2008年   1352篇
  2007年   1301篇
  2006年   1215篇
  2005年   1066篇
  2004年   1045篇
  2003年   961篇
  2002年   992篇
  2001年   1623篇
  2000年   1519篇
  1999年   1109篇
  1998年   549篇
  1997年   469篇
  1996年   440篇
  1992年   873篇
  1991年   822篇
  1990年   836篇
  1989年   829篇
  1988年   802篇
  1987年   743篇
  1986年   797篇
  1985年   841篇
  1984年   667篇
  1983年   617篇
  1982年   467篇
  1981年   461篇
  1979年   692篇
  1978年   532篇
  1976年   474篇
  1975年   604篇
  1974年   701篇
  1973年   707篇
  1972年   586篇
  1971年   529篇
  1970年   511篇
  1969年   572篇
  1968年   664篇
  1967年   564篇
  1966年   579篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
This study examines the relationship of life stress, daily hassles, and perceived self-efficacy to adjustment in a community sample of 32 men and 32 women between ages 65 and 75. In a structured interview, negative life change events, daily hassles, self-efficacy, depression, psychosomatic symptoms, and negative well being were assessed. Both negative life events and daily hassles were related to psychological distress and physical symptoms for men, and hassles were associated with psychological distress and physical symptoms for women. An inverse relationship between self-efficacy and maladjustment was also found. Hassles showed the most powerful relationship to distress.  相似文献   
42.
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   
43.
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   
44.
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   
45.
46.
47.
48.
49.
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