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   76640篇
  免费   3090篇
  国内免费   27篇
  2020年   725篇
  2019年   947篇
  2018年   1286篇
  2017年   1354篇
  2016年   1433篇
  2015年   1048篇
  2014年   1224篇
  2013年   5842篇
  2012年   2248篇
  2011年   2414篇
  2010年   1505篇
  2009年   1476篇
  2008年   2088篇
  2007年   2157篇
  2006年   1928篇
  2005年   1742篇
  2004年   1626篇
  2003年   1523篇
  2002年   1652篇
  2001年   2470篇
  2000年   2421篇
  1999年   1850篇
  1998年   862篇
  1997年   770篇
  1996年   794篇
  1995年   699篇
  1992年   1572篇
  1991年   1466篇
  1990年   1439篇
  1989年   1319篇
  1988年   1315篇
  1987年   1247篇
  1986年   1315篇
  1985年   1343篇
  1984年   1118篇
  1983年   1008篇
  1982年   724篇
  1981年   735篇
  1979年   1203篇
  1978年   867篇
  1975年   978篇
  1974年   1097篇
  1973年   1207篇
  1972年   990篇
  1971年   947篇
  1970年   877篇
  1969年   863篇
  1968年   1117篇
  1967年   1017篇
  1966年   870篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
My aim in this paper is to demonstrate that the recent anti-Ticking Bomb argument offered by Bufacchi and Arrigo is unsuccessful. To adequately refute the Ticking Bomb strategy, I claim, requires carefully addressing both policy questions and questions involving exceptional conduct.  相似文献   
12.
13.
14.
15.
16.
17.
Adult age differences in the consistency effect were examined in 3 experiments. The consistency effect refers to items inconsistent with expectations being better remembered than items consistent with expectations. Younger and older adults walked into an office room and viewed objects that varied in their consistency with expectation. Immediate and delayed recognition tests on item information (i.e., distractors were defined by their semantic identity) revealed that both age groups recognized unexpected items better than expected items. However, when recognition of token information was requested (i.e., distractors were defined by their physical appearance), younger adults, in contrast to older adults, exhibited consistency effects. Also, under divided attention, young adults revealed the same pattern of data as did elderly adults under full attention. The results are discussed in terms of capacity-related differences in distinctive encoding.  相似文献   
18.
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   
19.
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   
20.
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