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   1579篇
  免费   51篇
  2022年   8篇
  2021年   10篇
  2020年   22篇
  2019年   20篇
  2018年   45篇
  2017年   33篇
  2016年   39篇
  2015年   27篇
  2014年   24篇
  2013年   184篇
  2012年   57篇
  2011年   66篇
  2010年   32篇
  2009年   40篇
  2008年   53篇
  2007年   61篇
  2006年   65篇
  2005年   47篇
  2004年   40篇
  2003年   41篇
  2002年   72篇
  2001年   25篇
  2000年   36篇
  1999年   34篇
  1998年   31篇
  1997年   28篇
  1996年   24篇
  1995年   10篇
  1994年   17篇
  1993年   26篇
  1992年   23篇
  1991年   18篇
  1990年   22篇
  1989年   19篇
  1988年   25篇
  1987年   16篇
  1986年   17篇
  1985年   21篇
  1984年   24篇
  1983年   20篇
  1982年   15篇
  1981年   18篇
  1980年   17篇
  1979年   15篇
  1978年   26篇
  1977年   13篇
  1976年   12篇
  1975年   16篇
  1973年   10篇
  1966年   10篇
排序方式: 共有1630条查询结果,搜索用时 15 毫秒
931.
The MacAndrew Alcoholism (MAC) and Sc scales of the Minnesota Multiphasic Personality Inventory (MMPI) were examined in four groups of 20 male patients. Comparisons were made among primary alcoholics, secondary alcoholics (i.e., alcoholic psychiatric patients), nonalcoholic psychiatric patients (mixed diagnoses), and conservatively defined, nonalcoholic schizophrenics. Primary alcoholics scored higher on the MAC scale than did secondary alcoholics and other groups; schizophrenics scored lower than all other groups. Primary alcoholics were lower on the Sc scale than schizophrenics but did not differ from other groups. The results support MacAndrew's (1981) distinction between primary and secondary alcoholics and suggest that the MAC scale may enhance differentiation among diagnoses other than alcoholism.  相似文献   
932.
Many writers have implicitly or explicitly stated that nonparametric tests are free from the assumption of homogeneity of variance. Nonparametric tests for difference in central tendencies generally involve the assumption of homogeneity of variance. The assumption of homogeneity of variance for the t test and for nonparametric tests serves the same purpose: it allows the user to draw more specific inferences when the null hypothesis is rejected.  相似文献   
933.
934.
This study reports the differences in intelligence across thirty-one regions of the People's Republic of China. It was found that regional IQs were significantly associated with the percentage of Han in the population (r = .59), GDP per capita (r = .42), the percentage of those with higher education (r = .38, p < .05), and non-significantly with years of education (r = .32).  相似文献   
935.
Flynn has been credited with having discovered the increase in IQs that has been reported in a number of countries during most of the twentieth century and that has come to be known as “the Flynn effect”. This paper documents and discusses a number of reports of increases in IQs that were published from 1936 onwards before the phenomenon was rediscovered by  and . These early reports showed that the Flynn effect is fully present in pre-school children, does not increase during the school age years, and is greater for non-verbal abilities than for verbal abilities.  相似文献   
936.
937.
938.
939.
Using data from the Client/Patient Sample Survey, a nationally representative study of outpatient mental health service utilization, the prevalence and correlates of psychotropic medication receipt for youth who live with families and in foster care are compared. The medication rate is similar for both groups, with slightly more than one-third of youth treated with medication. Additionally, when medication is prescribed, it is the sole intervention provided for close to one half of each group, and the distribution of other services received (such as clinical case management and collateral services) is similar, regardless of living situation. However, the predictors of medication use differ for the two groups. Among foster care youth, only presenting problems of depressed mood, being withdrawn, and suicidality significantly increase the odds of medication; among youth with families, sociodemographic characteristics (male gender), and a range of clinical factors (disruptive behavior disorder, presenting problems of hyperactivity and sleep disturbance, prior mental health service receipt, and inpatient or residential care referral sources) increase the likelihood of medication. The conclusion that distinct sets of factors predict medication for the two groups was reinforced by results of multivariate analyses; foster care status moderates the association between medication receipt and only one of the correlates examined (gender). Implications, limitations, and areas for future research are presented.  相似文献   
940.
We examine developmental interactions between context, exploration, and word learning. Infants show an understanding of how nonsolid substances are categorized that does not reliably transfer to learning how these categories are named in laboratory tasks. We argue that what infants learn about naming nonsolid substances is contextually bound – most nonsolids that toddlers are familiar with are foods and thus, typically experienced when sitting in a highchair. We asked whether 16‐month‐old children's naming of nonsolids would improve if they were tested in that typical context. Children tested in the highchair demonstrated better understanding of how nonsolids are named. Furthermore, context‐based differences in exploration drove differences in the properties attended to in real‐time. We discuss what implications this context‐dependency has for understanding the development of an ontological distinction between solids and nonsolids. Together, these results demonstrate a developmental cascade between context, exploration, and word learning.  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