全文获取类型
| 收费全文 | 323篇 |
| 免费 | 14篇 |
专业分类
| 教育 | 245篇 |
| 科学研究 | 19篇 |
| 各国文化 | 5篇 |
| 体育 | 16篇 |
| 文化理论 | 1篇 |
| 信息传播 | 51篇 |
出版年
| 2023年 | 2篇 |
| 2022年 | 3篇 |
| 2021年 | 3篇 |
| 2020年 | 8篇 |
| 2019年 | 9篇 |
| 2018年 | 8篇 |
| 2017年 | 13篇 |
| 2016年 | 5篇 |
| 2015年 | 6篇 |
| 2014年 | 2篇 |
| 2013年 | 95篇 |
| 2012年 | 12篇 |
| 2011年 | 12篇 |
| 2010年 | 10篇 |
| 2009年 | 5篇 |
| 2008年 | 7篇 |
| 2007年 | 10篇 |
| 2006年 | 9篇 |
| 2005年 | 12篇 |
| 2004年 | 10篇 |
| 2003年 | 5篇 |
| 2002年 | 4篇 |
| 2001年 | 2篇 |
| 2000年 | 4篇 |
| 1997年 | 5篇 |
| 1996年 | 4篇 |
| 1995年 | 4篇 |
| 1994年 | 6篇 |
| 1992年 | 5篇 |
| 1991年 | 10篇 |
| 1990年 | 2篇 |
| 1989年 | 6篇 |
| 1987年 | 2篇 |
| 1986年 | 2篇 |
| 1985年 | 2篇 |
| 1984年 | 2篇 |
| 1983年 | 2篇 |
| 1982年 | 2篇 |
| 1980年 | 3篇 |
| 1979年 | 2篇 |
| 1978年 | 3篇 |
| 1977年 | 2篇 |
| 1976年 | 2篇 |
| 1975年 | 1篇 |
| 1973年 | 1篇 |
| 1970年 | 1篇 |
| 1969年 | 2篇 |
| 1945年 | 1篇 |
| 1895年 | 1篇 |
| 1882年 | 3篇 |
排序方式： 共有337条查询结果，搜索用时 796 毫秒
81.
On belief-desire reasoning tasks, children first pass tasks involving true belief before those involving false belief, and tasks involving positive desire before those involving negative desire. The current study examined belief-desire reasoning in participants old enough to pass all such tasks. Eighty-three 6- to 11-year-olds and 20 adult participants completed simple, computer-based tests of belief-desire reasoning, which recorded response times as well as error rates. Both measures suggested that, like young children, older children and adults find it more difficult to reason about false belief and negative desires than true beliefs and positive desires. It is argued that this developmental continuity is most consistent with either executive competence or executive performance accounts of the development of belief-desire reasoning. 相似文献
82.
Belsky J Vandell DL Burchinal M Clarke-Stewart KA McCartney K Owen MT;NICHD Early Child Care Research Network 《Child development》2007,78(2):681-701
Effects of early child care on children's functioning from 4(1/2) years through the end of 6th grade (M age=12.0 years) were examined in the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development (n=1,364). The results indicated that although parenting was a stronger and more consistent predictor of children's development than early child-care experience, higher quality care predicted higher vocabulary scores and more exposure to center care predicted more teacher-reported externalizing problems. Discussion focuses on mechanisms responsible for these effects, the potential collective consequences of small child-care effects, and the importance of the ongoing follow-up at age 15. 相似文献
83.
Daniel F. B. Haeufle Jay Worobets Ian Wright Jenny Haeufle Darren Stefanyshyn 《Sports Engineering》2012,15(4):215-220
A common belief in the golf community is that a lighter shaft allows the golfer to swing the club faster. From a mechanical point of view, reducing the mass of the shaft would result in a faster swing. However, a golfer is not a purely mechanical system, and so it is simplistic to assume that identical loads will be applied when swinging different clubs. Therefore, the purpose of this study was to test the hypothesis that golfers behave similar to a mechanical model when swinging clubs of varying mass. A torque driven model estimated the effects caused by the addition of 22?g to the shaft. Twelve golfers hit balls with a standard driver as well as a driver fitted with the same 22?g increase in mass. Club kinematics were collected with a high-speed motion capture system. The model predicted a 1.7?% lower club head speed for the club with additional mass. One subject showed a similar reduction (1.4?%), but one subject showed an increase in club head speed by 3.0?%. Ten subjects did not show any significant differences. These results suggest that golfers do not respond to changes in club mass in a mechanically predictable way. 相似文献
84.
Worobets J Stefanyshyn D 《Sports biomechanics / International Society of Biomechanics in Sports》2012,11(2):239-248
The role of shaft stiffness on the golf swing is not well understood. Studies in which golfers hit balls with clubs of varying shaft flex have reported changes in ball distance. The results of mathematical models suggest that shaft stiffness affects only the orientation of the clubhead at impact, not the speed of the clubhead, but there are no experimental results validating these findings. The purpose of this study was therefore to experimentally examine the influence of shaft stiffness on clubhead kinematics at ball impact. Forty golfers hit 10 balls with each of five drivers varying in shaft stiffness from 'Ladies' to 'Extra-Stiff', in a double-blind study design. The motions of three reflective markers attached to the clubhead were captured with a high-speed motion analysis system. At ball impact, shaft stiffness had a statistically significant influence on clubhead speed for 27 subjects, on loft angle for 11 subjects, and on lie angle for all 40 subjects. No effect was observed on face angle, in to out path angle, or attack angle. These results show that shaft stiffness can affect ball launch conditions by altering clubhead speed and/or loft angle. 相似文献
85.
An important criticism of high-stakes testing policies – policies that reward or sanction schools based on their students’ performance on standardized tests – is that they provide schools with an incentive to focus on those subjects that play a role in the accountability system while decreasing attention to those subjects that are not part of the program. This paper utilizes a regression discontinuity design to evaluate the impact of Florida's high-stakes testing policy on student proficiency in the low-stakes subject of science. We confirm prior results that students in schools facing more immediate sanctions under the policy made substantial gains in the high-stakes subjects of math and reading. Contrary to the crowding-out hypothesis, we find that students in these schools made substantial achievement gains in the low-stakes subject of science as well. 相似文献
86.
87.
88.
89.
90.