全文获取类型
| 收费全文 | 33669篇 |
| 免费 | 501篇 |
| 国内免费 | 33篇 |
专业分类
| 教育 | 23682篇 |
| 科学研究 | 3193篇 |
| 各国文化 | 372篇 |
| 体育 | 3159篇 |
| 综合类 | 12篇 |
| 文化理论 | 300篇 |
| 信息传播 | 3485篇 |
出版年
| 2021年 | 342篇 |
| 2020年 | 525篇 |
| 2019年 | 749篇 |
| 2018年 | 1043篇 |
| 2017年 | 958篇 |
| 2016年 | 966篇 |
| 2015年 | 600篇 |
| 2014年 | 785篇 |
| 2013年 | 6258篇 |
| 2012年 | 735篇 |
| 2011年 | 807篇 |
| 2010年 | 643篇 |
| 2009年 | 621篇 |
| 2008年 | 705篇 |
| 2007年 | 637篇 |
| 2006年 | 617篇 |
| 2005年 | 545篇 |
| 2004年 | 593篇 |
| 2003年 | 484篇 |
| 2002年 | 476篇 |
| 2001年 | 837篇 |
| 2000年 | 733篇 |
| 1999年 | 621篇 |
| 1998年 | 360篇 |
| 1997年 | 349篇 |
| 1996年 | 368篇 |
| 1995年 | 327篇 |
| 1994年 | 345篇 |
| 1993年 | 281篇 |
| 1992年 | 470篇 |
| 1991年 | 474篇 |
| 1990年 | 456篇 |
| 1989年 | 478篇 |
| 1988年 | 420篇 |
| 1987年 | 427篇 |
| 1986年 | 427篇 |
| 1985年 | 487篇 |
| 1984年 | 394篇 |
| 1983年 | 374篇 |
| 1982年 | 324篇 |
| 1981年 | 306篇 |
| 1980年 | 318篇 |
| 1979年 | 439篇 |
| 1978年 | 335篇 |
| 1977年 | 296篇 |
| 1976年 | 245篇 |
| 1975年 | 251篇 |
| 1974年 | 247篇 |
| 1973年 | 249篇 |
| 1971年 | 216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.
Jonathan J. Mallett 《Learned Publishing》2021,34(1):49-56
- 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.
4.
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
5.
Michael J. Mouat 《Journal of Cultural Economy》2018,11(4):315-329
According to its proponents, animal-free animal food products, such as cultured meat and synthetic cow’s milk, have the potential to overcome various environmental, health and ethical challenges that have emerged around global animal product consumption and the industrial agriculture that is needed to support it. Apart from the myriad of technical problems making animal-free food products, critics have pointed out the blurry ontological status of the food and the ethical challenges therein, and have questioned the veracity of the various promissory narratives being produced. This paper considers animal-free food from a social studies of economies and markets (SSEM) perspective. As a market that currently mostly only exists in potential, an SSEM perspective can reveal the various social and material relations that comprise the (bio)capital formation that will underpin any market-to-be, an aspect of markets that are often invisible once markets are up and running. Moreover, this perspective details the intimate role markets have in establishing the ethical and ontological aspects of animal-free foods in a political economy shaped by neoliberalisation and financialisation. 相似文献
6.
Anthony J. Sadar 《Science & Education》2018,27(1-2):233-235
7.
8.
9.
10.