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   170689篇
  免费   7648篇
  国内免费   157篇
  2020年   2774篇
  2019年   3431篇
  2018年   3433篇
  2017年   3878篇
  2016年   4569篇
  2015年   3919篇
  2014年   4789篇
  2013年   23428篇
  2012年   4385篇
  2011年   3406篇
  2010年   3776篇
  2009年   4725篇
  2008年   3668篇
  2007年   3172篇
  2006年   3834篇
  2005年   3855篇
  2004年   3371篇
  2003年   3012篇
  2002年   2810篇
  2001年   3071篇
  2000年   2913篇
  1999年   2959篇
  1998年   2800篇
  1997年   2644篇
  1996年   2567篇
  1995年   2389篇
  1994年   2359篇
  1993年   2319篇
  1992年   2503篇
  1991年   2361篇
  1990年   2206篇
  1989年   2155篇
  1988年   2102篇
  1987年   2157篇
  1986年   2152篇
  1985年   2385篇
  1984年   2493篇
  1983年   2264篇
  1982年   2357篇
  1981年   2335篇
  1980年   2159篇
  1979年   2179篇
  1978年   2146篇
  1977年   2145篇
  1976年   1918篇
  1975年   2012篇
  1974年   2053篇
  1973年   1959篇
  1972年   1551篇
  1971年   1512篇
排序方式: 共有10000条查询结果,搜索用时 15 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