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   19979篇
  免费   293篇
  国内免费   57篇
教育   14837篇
科学研究   1353篇
各国文化   241篇
体育   1481篇
综合类   44篇
文化理论   136篇
信息传播   2237篇
  2021年   203篇
  2020年   279篇
  2019年   427篇
  2018年   590篇
  2017年   638篇
  2016年   588篇
  2015年   408篇
  2014年   540篇
  2013年   4325篇
  2012年   508篇
  2011年   548篇
  2010年   474篇
  2009年   482篇
  2008年   507篇
  2007年   477篇
  2006年   504篇
  2005年   449篇
  2004年   323篇
  2003年   338篇
  2002年   301篇
  2001年   431篇
  2000年   357篇
  1999年   310篇
  1998年   210篇
  1997年   204篇
  1996年   202篇
  1995年   178篇
  1994年   189篇
  1993年   168篇
  1992年   244篇
  1991年   238篇
  1990年   269篇
  1989年   245篇
  1988年   198篇
  1987年   203篇
  1986年   210篇
  1985年   201篇
  1984年   183篇
  1983年   174篇
  1982年   146篇
  1981年   155篇
  1980年   138篇
  1979年   211篇
  1978年   164篇
  1977年   136篇
  1976年   132篇
  1975年   124篇
  1974年   118篇
  1973年   120篇
  1971年   110篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
1.
Early childhood is a sensitive period for learning and social skill development. The maturation of cerebral regions underlying social processing lays the foundation for later social-emotional competence. This study explored myelin changes in social brain regions and their association with changes in parent-rated social-emotional development in a cohort of 129 children (64 females, 0–36 months, 77 White). Results reveal a steep increase in myelination throughout the social brain in the first 3 years of life that is significantly associated with social-emotional development scores. These findings add knowledge to the emerging picture of social brain development by describing neural underpinnings of human social behavior. They can contribute to identifying age-/stage-appropriate early life factors in this developmental domain.  相似文献   
2.
ABSTRACT

The aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8–18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.49 y) with distinct SB profiles using the SB modalities (time/d) as input variables. Latent transition analysis, an extension of LPA that uses longitudinal data, was used to analyse 2-year changes in these profiles. At baseline, four and three SB profiles were found among boys (labelled: screen, educative, social, and relaxing) and girls (labelled: screen/social, educative, and relaxing), respectively. Overall, more girls (range: 48%-67%) had the same profile over time, than boys (40%-52%). Participants with a screen or relaxing SB profile at baseline were more likely to have an educative profile after 2 years. Youth with a social and an educative SB profile at baseline were more likely to transition to profiles characterized by higher screen and social SB, respectively. Using a novel and person-centered approach, this study identified gender-specific SB profiles that were moderately stable over time.  相似文献   
3.
Abstract

This paper examines the key elements within the relationships of sport and civil society in Scandinavia. The analysis combines themes and developments in Nordic sport and civil society, such as the role of the welfare state and the impacts of neoliberalism, with consideration of specific national experiences, especially in Finland. The discussion has four main parts. First, we set out the principal features of the ‘Nordic model’ of society, and how it shapes sport and civil society relations. Second, we advance a Finnish case study, examining the historical connections of three sectors to the national sport culture. Third, we consider how, in recent decades, the Nordic model has encountered and sought to respond to neoliberalism and globalization processes. Finally, we explore how Nordic societies have sought to influence globalization processes and ‘global civil society’ through sport, specifically through taking lead roles within the transnational ‘sport for development and peace’ sector.  相似文献   
4.
5.
In this digital ITEMS module, Dr. Jeffrey Harring and Ms. Tessa Johnson introduce the linear mixed effects (LME) model as a flexible general framework for simultaneously modeling continuous repeated measures data with a scientifically defensible function that adequately summarizes both individual change as well as the average response. The module begins with a nontechnical overview of longitudinal data analyses drawing distinctions with cross-sectional analyses in terms of research questions to be addressed. Nuances of longitudinal designs, timing of measurements, and the real possibility of missing data are then discussed. The three interconnected components of the LME model—(1) a model for individual and mean response profiles, (2) a model to characterize the covariation among the time-specific residuals, and (3) a set of models that summarize the extent that individual coefficients vary—are discussed in the context of the set of activities comprising an analysis. Finally, they demonstrate how to estimate the linear mixed effects model within an open-source environment (R). The digital module contains sample R code, diagnostic quiz questions, hands-on activities in R, curated resources, and a glossary.  相似文献   
6.
Young children show social preferences for resource-rich individuals, although few studies have explored the causes underlying such preferences. We evaluate the viability of one candidate cause: Children believe that resource wealth relates to behavior, such that they expect the resource rich to be more likely to materially benefit others (including themselves) than the resource poor. In Studies 1 and 2 (ages 4–10), American children from predominantly middle-income families (= 94) and Indian children from lower income families (= 30) predicted that the resource rich would be likelier to share with others than the resource poor. In Study 3, American children (= 66) made similar predictions in an incentivized decision-making task. The possibility that children's expectations regarding giving contribute to prowealth preferences is discussed.  相似文献   
7.
8.
9.
10.
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