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   171396篇
  免费   7752篇
  国内免费   157篇
  2020年   2810篇
  2019年   3446篇
  2018年   3448篇
  2017年   3929篇
  2016年   4608篇
  2015年   3952篇
  2014年   4815篇
  2013年   23557篇
  2012年   4423篇
  2011年   3444篇
  2010年   3808篇
  2009年   4748篇
  2008年   3685篇
  2007年   3191篇
  2006年   3843篇
  2005年   3877篇
  2004年   3394篇
  2003年   3035篇
  2002年   2826篇
  2001年   3070篇
  2000年   2910篇
  1999年   2967篇
  1998年   2811篇
  1997年   2648篇
  1996年   2581篇
  1995年   2401篇
  1994年   2370篇
  1993年   2324篇
  1992年   2512篇
  1991年   2368篇
  1990年   2208篇
  1989年   2157篇
  1988年   2099篇
  1987年   2160篇
  1986年   2154篇
  1985年   2387篇
  1984年   2497篇
  1983年   2266篇
  1982年   2364篇
  1981年   2340篇
  1980年   2163篇
  1979年   2185篇
  1978年   2152篇
  1977年   2156篇
  1976年   1918篇
  1975年   2012篇
  1974年   2055篇
  1973年   1958篇
  1972年   1548篇
  1971年   1513篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
The purpose of this study is to compare field investigative interviews of children (FIIC) with three different legal outcomes in child sexual abuse cases: (i) insufficient evidence to proceed (IEP); (ii) convictions; or (iii) acquittals by the court. One hundred FIIC were divided into one of the three outcome possibilities. Amongst the female interviewees older than 10 years, there were no cases of acquittals and the convicted cases were over-represented. The children's response to open questions was found to be the main difference between the three FIIC outcomes. The responses to these open questions were 1.9 and 2.3 times longer in the convicted cases compared to acquittals and IEP. Possible explanations for the result are discussed. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   
52.
53.
54.
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   
55.
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   
56.
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