全文获取类型
| 收费全文 | 25169篇 |
| 免费 | 202篇 |
| 国内免费 | 22篇 |
专业分类
| 教育 | 18268篇 |
| 科学研究 | 2769篇 |
| 各国文化 | 128篇 |
| 体育 | 1501篇 |
| 综合类 | 8篇 |
| 文化理论 | 483篇 |
| 信息传播 | 2236篇 |
出版年
| 2021年 | 138篇 |
| 2020年 | 198篇 |
| 2019年 | 283篇 |
| 2018年 | 2525篇 |
| 2017年 | 2457篇 |
| 2016年 | 1952篇 |
| 2015年 | 387篇 |
| 2014年 | 441篇 |
| 2013年 | 2492篇 |
| 2012年 | 530篇 |
| 2011年 | 1080篇 |
| 2010年 | 1149篇 |
| 2009年 | 656篇 |
| 2008年 | 921篇 |
| 2007年 | 1409篇 |
| 2006年 | 302篇 |
| 2005年 | 599篇 |
| 2004年 | 693篇 |
| 2003年 | 578篇 |
| 2002年 | 312篇 |
| 2001年 | 450篇 |
| 2000年 | 322篇 |
| 1999年 | 258篇 |
| 1998年 | 128篇 |
| 1997年 | 170篇 |
| 1996年 | 124篇 |
| 1995年 | 131篇 |
| 1994年 | 137篇 |
| 1993年 | 104篇 |
| 1992年 | 179篇 |
| 1991年 | 182篇 |
| 1990年 | 187篇 |
| 1989年 | 189篇 |
| 1988年 | 160篇 |
| 1987年 | 154篇 |
| 1986年 | 156篇 |
| 1985年 | 199篇 |
| 1984年 | 153篇 |
| 1983年 | 130篇 |
| 1982年 | 127篇 |
| 1981年 | 116篇 |
| 1980年 | 111篇 |
| 1979年 | 163篇 |
| 1978年 | 124篇 |
| 1977年 | 107篇 |
| 1976年 | 80篇 |
| 1975年 | 108篇 |
| 1974年 | 97篇 |
| 1973年 | 103篇 |
| 1971年 | 86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.
Daniel C. Kopala-Sibley Marilyn Cyr Megan C. Finsaas Jonathan Orawe Anna Huang Nim Tottenham Daniel N. Klein 《Child development》2020,91(1):110-128
Seventy-nine 3-year olds and their mothers participated in a laboratory-based task to assess maternal hostility. Mothers also reported their behavioral regulation of their child. Seven years later, functional magnetic resonance imaging data were acquired while viewing emotional faces and completing a reward processing task. Maternal hostility predicted more negative amygdala connectivity during exposure to sad relative to neutral faces with frontal and parietal regions as well as more negative left ventral striatal connectivity during monetary gain relative to loss feedback with the right posterior orbital frontal cortex and right inferior frontal gyrus. In contrast, maternal regulation predicted enhanced cingulo-frontal connectivity during monetary gain relative to loss feedback. Results suggest parenting is associated with alterations in emotion and reward processing circuitry 7–8 years later. 相似文献
4.
David Kaldewey 《Minerva》2018,56(2):161-182
This article analyzes the concept of “grand challenges” as part of a shift in how scientists and policymakers frame and communicate their respective agendas. The history of the grand challenges discourse helps to understand how identity work in science and science policy has been transformed in recent decades. Furthermore, the question is raised whether this discourse is only an indicator, or also a factor in this transformation. Building on conceptual history and historical semantics, the two parts of the article reconstruct two discursive shifts. First, the observation that in scientific communication references to “problems” are increasingly substituted by references to “challenges” indicates a broader cultural trend of how attitudes towards what is problematic have shifted in the last decades. Second, as the grand challenges discourse is rooted in the sphere of sports and competition, it introduces a specific new set of societal values and practices into the spheres of science and technology. The article concludes that this process can be characterized as the sportification of science, which contributes to self-mobilization and, ultimately, to self-optimization of the participating scientists, engineers, and policymakers. 相似文献
5.
6.
7.
8.
9.
10.