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   52577篇
  免费   1358篇
  国内免费   8篇
  2020年   327篇
  2019年   463篇
  2018年   3919篇
  2017年   3270篇
  2016年   2762篇
  2015年   614篇
  2014年   610篇
  2013年   2464篇
  2012年   1521篇
  2011年   3331篇
  2010年   3037篇
  2009年   2047篇
  2008年   2559篇
  2007年   2979篇
  2006年   866篇
  2005年   962篇
  2004年   893篇
  2003年   766篇
  2002年   752篇
  2001年   1047篇
  2000年   976篇
  1999年   723篇
  1998年   402篇
  1997年   325篇
  1996年   315篇
  1992年   550篇
  1991年   542篇
  1990年   535篇
  1989年   538篇
  1988年   530篇
  1987年   495篇
  1986年   522篇
  1985年   570篇
  1984年   452篇
  1983年   432篇
  1982年   354篇
  1981年   338篇
  1979年   523篇
  1978年   378篇
  1976年   359篇
  1975年   432篇
  1974年   487篇
  1973年   507篇
  1972年   407篇
  1971年   381篇
  1970年   378篇
  1969年   409篇
  1968年   488篇
  1967年   421篇
  1966年   422篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
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   
52.
53.
54.
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   
55.
This study examined information communication technologies and workplace friendship dynamics. Employees reported factors that influenced their initiation of friendship with a coworker and reported patterns and perceptions of communication with their workplace friend via different communication methods. Results indicated that personality, shared tasks, and perceived similarity are the most important factors to coworker friendship initiation, and the importance of physical proximity to workplace friendship is diminishing in the electronically connected workplace. Results confirm the primacy of face‐to‐face interaction for workplace friendship initiation and maintenance. E‐mail, phone, and texting were also central to communication among workplace friends. The amount of time spent telecommuting affected workplace friendship initiation and communication. Finally, generational differences were identified with respect to Internet‐based communication methods.  相似文献   
56.
The country‐of‐origin effect is a topic central to the field of international marketing. Country of origin has been found to exert a particularly potent effect on consumer evaluation in situations where there is a strong link between a country and a particular product category. The present study provides further insight into how this particular effect can be understood. Drawing on a novel conceptualization of how country image and product categories interact, this study tested the relative evaluative relevance of product category with respect to estimates of brand equity across a variety of product categories. The findings suggest that facets of a country's image that are more closely related to the evaluation situation exert a greater influence on the evaluation of brands. This result encourages scholars as well as practitioners to re‐evaluate which situations might cause the country of origin effect to hold managerial relevance and paves the way for new paths toward a more comprehensive understanding of the effect. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
57.
58.
59.
60.
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