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   71062篇
  免费   1292篇
  国内免费   800篇
教育   45261篇
科学研究   9785篇
各国文化   562篇
体育   5428篇
综合类   1967篇
文化理论   358篇
信息传播   9793篇
  2022年   534篇
  2021年   1352篇
  2020年   1261篇
  2019年   1168篇
  2018年   1499篇
  2017年   1655篇
  2016年   1519篇
  2015年   1848篇
  2014年   2713篇
  2013年   9498篇
  2012年   3504篇
  2011年   3724篇
  2010年   3281篇
  2009年   3012篇
  2008年   3073篇
  2007年   3310篇
  2006年   3223篇
  2005年   2714篇
  2004年   1649篇
  2003年   1468篇
  2002年   1443篇
  2001年   1576篇
  2000年   1225篇
  1999年   1191篇
  1998年   772篇
  1997年   688篇
  1996年   681篇
  1995年   550篇
  1994年   534篇
  1993年   435篇
  1992年   592篇
  1991年   582篇
  1990年   573篇
  1989年   567篇
  1988年   491篇
  1987年   477篇
  1986年   478篇
  1985年   513篇
  1984年   466篇
  1983年   450篇
  1982年   355篇
  1981年   365篇
  1980年   375篇
  1979年   507篇
  1978年   392篇
  1977年   335篇
  1976年   300篇
  1975年   276篇
  1974年   269篇
  1971年   268篇
排序方式: 共有10000条查询结果,搜索用时 15 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.
As medical programs place increasing importance on competency-based training and surgical simulations for residents, anatomy laboratories, and body donation programs find themselves in a position of adapting to changing demands. To better assess the demand for “life-like” cadaveric specimens and evaluate the possible impacts that competency-based medical education could have upon the body donation program of McGill University, Canada, the authors tracked, over the course of the last 10 years, the number of soft-embalmed specimens, along with the number of teaching sessions and the residents enrolled in competency-based programs that are using cadaveric material. The results reveal that the number of soft-embalmed specimens used within residency training increased from 5 in 2009 to 35 in 2019, representing an increase from 6% of bodies to 36.5% of the total number of body donors embalmed in this institution. Correspondingly, the number of annual teaching sessions for residents increased from 19 in 2012 to 116 in 2019. These increases in teaching are correlated with increasing number of residents enrolled in competency-based programs over the last 3 years (Pearson r ranging from 0.9705 to 0.9903, and R2 ranging from 0.9418 to 0.9808). Those results suggest that the new skill-centered curricula which require residents to perform specific tasks within realistic settings, exhibit a growing demand for “life-like” cadaveric specimens. Institutions’ body donation programs must, therefore, adapt to those greater need for cadaveric specimens, which presents many challenges, ranging from the logistical to the ethical.  相似文献   
3.
当前,社会经济在快速发展,但是目前我国农村国民的文化素质却没有表现出相应的提高.一直以来,我国农村人口在总人口中占比较重,为了提高我国农民的整体文化素质,以进一步提高我国国民的整体素养,国家大力发展继续教育,畅通继续教育的通道.本文针对大力发展农村社区教育的意义以及在农村社区继续教育过程中存在的问题展开研究分析,更多地剖析其中存在的问题,为我国目前农村社区教育添砖加瓦,促进农村社区教育更好地发展.  相似文献   
4.
  • Scientific publication has been a key part of the scientific method since the inception of Philosophical Transactions in 1665.
  • The scientific publications industry has grown exponentially along with science, incorporating technological innovations along the way, and adapting journal processes and practices to changing needs of science as it matured.
  • Of all the technological innovations over more than 300 years, the move to online journals may be the most significant, making open access to content practical for the first time.
  • The open‐access movement is disrupting the economics of journal publishing, which is hoped will make the industry more competitive: the ability of the publications industry to adapt to open access will be a measure of its resilience.
  • The demand for articles published in reputable journals continues to grow as readers trust the credibility of peer reviewed journal articles, and good authors value the prestige of publishing in the best journals.
  • It is difficult to predict what new functionalities may be included in articles of the future or what additional services publishers and editors will provide, but there is every reason to believe that scientific journal articles are here to stay.
  相似文献   
5.
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   
6.
7.
8.
9.
10.
通过对韩国电子竞技的发展及现状进行研究分析,发现其主要得益于政府政策的大力扶植;良好的社会群众基础;优秀的人才培养体系;媒体、企业的大力支持等。同时为我国电子竞技日后的良好发展提出以下建议:制定相关政策法规,加大政府对电竞的支持度;创设良好的舆论氛围,增强社会对电竞的认可度;完善人才培养体系,为电竞发展输送优质人才;加强媒体正面报道,吸引大型企业的资金帮助。  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