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   88922篇
  免费   3699篇
  国内免费   43篇
  2020年   1026篇
  2019年   1230篇
  2018年   1836篇
  2017年   1847篇
  2016年   2020篇
  2015年   1413篇
  2014年   1616篇
  2013年   7419篇
  2012年   3136篇
  2011年   3157篇
  2010年   1785篇
  2009年   1867篇
  2008年   2548篇
  2007年   2537篇
  2006年   2299篇
  2005年   3080篇
  2004年   2484篇
  2003年   2215篇
  2002年   1924篇
  2001年   2711篇
  2000年   2610篇
  1999年   1964篇
  1998年   948篇
  1997年   861篇
  1996年   914篇
  1995年   866篇
  1994年   827篇
  1993年   799篇
  1992年   1636篇
  1991年   1511篇
  1990年   1510篇
  1989年   1412篇
  1988年   1401篇
  1987年   1294篇
  1986年   1290篇
  1985年   1390篇
  1984年   1139篇
  1983年   1018篇
  1982年   798篇
  1979年   1191篇
  1978年   865篇
  1977年   788篇
  1975年   950篇
  1974年   1098篇
  1973年   1144篇
  1972年   993篇
  1971年   893篇
  1968年   980篇
  1967年   868篇
  1966年   835篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
We investigated motivational and cognitive processes of behavior change with respect to mammography screening. One hundred forty-two women (ages 40 and older) recruited from three worksites answered a 41-item questionnaire consisting of statements based on constructs from the transtheoretical model of behavior change. Principal-components analysis identified two factors: a six-item component representing positive perceptions of mammography (Pros) and a six-item component representing avoidance of mammography (Cons). Analysis of variance showed that Pros, Cons, and a derived Decisional Balance measure (Pros minus Cons) were associated with stage of mammography adoption. Results are consistent with applications of the model to smoking cessation. The model is also discussed as it relates to other theories of behavior change and as a general strategy for analyzing perceptual data pertinent to health-related actions and intentions for behavioral change.  相似文献   
22.
Range of electric vehicles (EVs) has long been considered a major barrier in acceptance of electric mobility. We examined the nature of how range is experienced in an EV and whether variables from other adaptation contexts, notably stress, have explanatory power for inter‐individual differences in what we term comfortable range. Forty EVs were leased to a sample of users for a 6‐month field study. Qualitative and quantitative analyses of range experiences were performed, including regression analyses to examine the role of stress‐buffering personality traits and coping skills in comfortable range. Users appraised range as a resource to which they could successfully adapt and that satisfied most of their daily mobility needs. However, indicators were found that suggested suboptimal range utilisation. Stress‐buffering personality traits (control beliefs, ambiguity tolerance) and coping skills (subjective range competence, daily range practice) were found to play a substantial role in comfortable range. Hence, it may be possible to overcome perceived range barriers with the assistance of psychological interventions such as information, training, and interface design. Providing drivers with a reliable usable range may be more important than enhancing maximal range in an electric mobility system.  相似文献   
23.
24.
Introduction     
Journal of International Migration and Integration -  相似文献   
25.
The authors tested effects of a 10-week group cognitive-behavioral stress management intervention among 100 women newly treated for Stage 0-II breast cancer. The intervention reduced prevalence of moderate depression (which remained relatively stable in the control condition) but did not affect other measures of emotional distress. The intervention also increased participants' reports that having breast cancer had made positive contributions to their lives, and it increased generalized optimism. Both remained significantly elevated at a 3-month follow-up of the intervention. Further analysis revealed that the intervention had its greatest impact on these 2 variables among women who were lowest in optimism at baseline. Discussion centers on the importance of examining positive responses to traumatic events--growth, appreciation of life, shift in priorities, and positive affect-as well as negative responses.  相似文献   
26.
27.
28.
29.
30.
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