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   6967篇
  免费   345篇
  国内免费   88篇
  2023年   36篇
  2022年   31篇
  2021年   49篇
  2020年   88篇
  2019年   101篇
  2018年   103篇
  2017年   100篇
  2016年   106篇
  2015年   56篇
  2014年   64篇
  2013年   237篇
  2012年   70篇
  2011年   58篇
  2010年   50篇
  2009年   81篇
  2008年   71篇
  2007年   83篇
  2006年   79篇
  2005年   62篇
  2004年   55篇
  2003年   47篇
  2002年   37篇
  2001年   36篇
  2000年   28篇
  1999年   33篇
  1998年   17篇
  1997年   18篇
  1996年   28篇
  1995年   15篇
  1994年   8篇
  1993年   12篇
  1992年   20篇
  1991年   9篇
  1990年   11篇
  1989年   14篇
  1987年   6篇
  1986年   5篇
  1985年   446篇
  1984年   514篇
  1983年   422篇
  1982年   522篇
  1981年   494篇
  1980年   514篇
  1979年   460篇
  1978年   489篇
  1977年   368篇
  1976年   367篇
  1975年   309篇
  1974年   308篇
  1973年   254篇
排序方式: 共有7400条查询结果,搜索用时 15 毫秒
991.
992.
The transition to parenthood is a period of both joy and challenge for most parents. There is a recognized need to support parents during this period, yet existing interventions have shown limited evidence of efficacy. This study takes a consumer‐focused approach to examine the needs and preferences of parents both prenatally (n = 77) and postnatally (n = 123) for parenting support. The study used a cross‐sectional design with a purpose‐built online survey. Parents were recruited via online forums, Facebook and parenting blogs, childcare centers, and playgroups. In general, all parents were satisfied with their current levels of both formal and informal support, and about one fourth of parents had accessed a parenting intervention. Parents expressed a moderate level of interest in additional parenting information, and parents expecting their first baby indicated preferences for information about basic baby care needs whereas postnatally, parents expressed more interest in topics around self‐care and behavior management. The implications for developing interventions and engaging families are discussed.  相似文献   
993.
994.
995.
996.
997.
998.
Atypical forgetting functions have been demonstrated in several recent studies of delayed matching to sample, in which experimental conditions are altered partway through the retention interval. The forgetting functions are atypical in that accuracy or discriminability is not always a negatively accelerated monotonic function of increasing retention interval duration, but may increase at later times in the retention interval. Atypical forgetting functions reflect changes in levels of discrimination. A switch from a lower level to a higher level of discrimination, or vice versa, can occur at any time in the retention interval. The behavioral theories of remembering proposed by Nevin, Davison, Odum, and Shahan (2007), and White and Brown (2014), offer quantitative predictions of forgetting functions that differ in intercept or slope. Both theories are able to account for atypical forgetting functions, by assuming time‐independent changes in the mediating effect of attending to sample and comparison stimuli (in Nevin et al.'s model) or in the direct effect of the context of reinforcement of the conditional discrimination (in White & Brown's model). Despite differences in their main assumptions, the theories have an edge over any theory that assumes that forgetting is time‐dependent.  相似文献   
999.
Traditionally, behavior analysts have studied stimulus equivalence using a matching‐to‐sample (MTS) preparation. Although researchers have shown the utility of MTS to yield equivalence classes, the procedure requires several prerequisite skills for a learner to accurately respond. Previous research with humans and nonhumans has shown that relational responding can be produced via compound stimulus discrimination and successive matching‐to‐sample (S‐MTS). We conducted four experiments with college students to further evaluate the effectiveness of S‐MTS in the establishment of stimulus relations. S‐MTS trials consisted of the presentation of a single sample stimulus followed by one comparison in a fixed location on a computer screen. Depending upon the sample–comparison relation, participants touched (i.e., go) or did not touch (i.e., no‐go) the comparison stimulus. Following training of the baseline relations (AB/BC), we assessed the emergence of symmetry, transitivity, and equivalence performances (i.e., BA/CB and AC/CA). Results support the utility of the S‐MTS procedure as a possible alternative to traditional MTS. This study has direct implications for participants for whom traditional three‐array MTS procedures may be challenging.  相似文献   
1000.
ABSTRACT

The paper offers a few reflections on moral implications of making sacrifices and on possible duties to make sacrifices. It does not provide an exhaustive or a systematic account of the subject. There are too many disparate questions, and too many different perspectives from which to examine them to allow for a systematic let alone an exhaustive account, and too many factual issues that I am not aware of. Needless to say, the observations that follow are in part stimulated by the popularity of some views that are mistaken. I will not however examine any specific view or account of these matters. The aim is to provide some pointers that will be helpful when considering specific issues regarding the moral significance of sacrifice.  相似文献   
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