全文获取类型
收费全文 | 21488篇 |
免费 | 351篇 |
国内免费 | 139篇 |
专业分类
教育 | 14974篇 |
科学研究 | 2273篇 |
各国文化 | 187篇 |
体育 | 1458篇 |
综合类 | 274篇 |
文化理论 | 100篇 |
信息传播 | 2712篇 |
出版年
2022年 | 156篇 |
2021年 | 337篇 |
2020年 | 316篇 |
2019年 | 404篇 |
2018年 | 557篇 |
2017年 | 587篇 |
2016年 | 531篇 |
2015年 | 482篇 |
2014年 | 688篇 |
2013年 | 3616篇 |
2012年 | 794篇 |
2011年 | 864篇 |
2010年 | 740篇 |
2009年 | 740篇 |
2008年 | 728篇 |
2007年 | 773篇 |
2006年 | 779篇 |
2005年 | 705篇 |
2004年 | 407篇 |
2003年 | 398篇 |
2002年 | 339篇 |
2001年 | 471篇 |
2000年 | 377篇 |
1999年 | 355篇 |
1998年 | 205篇 |
1997年 | 205篇 |
1996年 | 209篇 |
1995年 | 160篇 |
1994年 | 174篇 |
1993年 | 153篇 |
1992年 | 231篇 |
1991年 | 219篇 |
1990年 | 248篇 |
1989年 | 224篇 |
1988年 | 175篇 |
1987年 | 183篇 |
1986年 | 187篇 |
1985年 | 177篇 |
1984年 | 183篇 |
1983年 | 170篇 |
1982年 | 134篇 |
1981年 | 136篇 |
1980年 | 132篇 |
1979年 | 190篇 |
1978年 | 160篇 |
1977年 | 113篇 |
1976年 | 119篇 |
1975年 | 111篇 |
1973年 | 104篇 |
1971年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 31 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.
David Sánchez-Oliva Rebecca M. Leech Alberto Grao-Cruces Irene Esteban-Cornejo Carmen Padilla-Moledo Oscar L. Veiga 《Journal of sports sciences》2020,38(9):1062-1069
ABSTRACTThe 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.
4.
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
5.
6.
7.
浅谈高校如何改善教师健康状况 总被引:2,自引:0,他引:2
谢颖 《哈尔滨体育学院学报》2004,22(1)
目前,我国高等院校教师的身体素质普遍偏低,影响到教师各项教学科研活动,而影响教师身体素质的因素很多,作为学校来说,应该切实关心教师的健康状况,通过改善教师生活条件,充分发挥健身场地和人才的优势。促进教师身体素质的提高。 相似文献
8.
排球课的准备活动对顺利完成课的目标有不可低估的作用.将准备活动按其活动形式分成徒手、带球、游戏、综合四大类型进行单组实验,结合问卷调查,对不同类型准备活动中学生的心理状态进行分析比较,认为排球课的准备活动,以有球的组织活动形式最好. 相似文献
9.
篮球运球技术是比赛和训练中的重要技术之一。熟练掌握好运球技术 ,是高校篮球教学中一个重要的环节。通过教学实验证明 :采用诱导性练习法 ,能加快学生熟练掌握技术的程度 ,对篮球教学起极其重要的作用。 相似文献
10.
Fei-yan Li Xi-sheng Xie Jun-ming Fan Zi Li Jiang Wu Rong Zheng 《Journal of Zhejiang University. Science. B》2009,10(9):659-667
EMT in a pressure magnitude- and duration-dependent manner, and that this TEMT is accompanied by TGF-β1 secretion. 相似文献