全文获取类型
| 收费全文 | 11508篇 |
| 免费 | 0篇 |
专业分类
| 教育 | 8876篇 |
| 科学研究 | 1217篇 |
| 体育 | 359篇 |
| 文化理论 | 382篇 |
| 信息传播 | 674篇 |
出版年
| 2022年 | 2篇 |
| 2020年 | 2篇 |
| 2019年 | 5篇 |
| 2018年 | 2172篇 |
| 2017年 | 2076篇 |
| 2016年 | 1566篇 |
| 2015年 | 105篇 |
| 2014年 | 112篇 |
| 2013年 | 73篇 |
| 2012年 | 216篇 |
| 2011年 | 689篇 |
| 2010年 | 834篇 |
| 2009年 | 429篇 |
| 2008年 | 637篇 |
| 2007年 | 1149篇 |
| 2006年 | 70篇 |
| 2005年 | 394篇 |
| 2004年 | 445篇 |
| 2003年 | 357篇 |
| 2002年 | 128篇 |
| 2001年 | 4篇 |
| 2000年 | 20篇 |
| 1997年 | 14篇 |
| 1991年 | 6篇 |
| 1985年 | 2篇 |
| 1976年 | 1篇 |
排序方式： 共有10000条查询结果，搜索用时 281 毫秒
1.
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
2.
3.
4.
5.
6.
7.
Anthony J. Sadar 《Science & Education》2018,27(1-2):233-235
8.
Koyama H Muraki Y Ae M 《Sports biomechanics / International Society of Biomechanics in Sports》2006,5(2):139-153
We investigated the immediate effects of the combined use of inclined and raised flat boards on the take-off motion of the long jump. Eight male long jumpers were videotaped with two high-speed video cameras (250 Hz) set perpendicular to the runway. The athletes jumped with three modified take-off boards: upward-inclined boards of two different inclinations (2.5 and 5.0 degrees), and a raised flat board (50 mm high). The jumpers performed pre- and post-jumps using their own techniques before and after use of the boards to test their effects. The post- jump revealed significantly less reduction in the horizontal velocity during the take-off than the pre-jump, and the effectiveness of converting the velocity from horizontal to vertical increased significantly in the post-jump. The post-jump demonstrated significantly less knee flexion of the take-off leg during take-off. The reduced knee flexion and slower extension velocity of the take-off leg in the second phase of the post-jump contributed to increasing the knee extension torque in the second phase and resulted in the increases in vertical ground reaction force and vertical velocity. These results suggest that the combined use of the inclined and raised flat boards induced immediate effective changes in the kinematics and kinetics of the take-off motion and represent appropriate training tools for take-off techniques of the long jump. 相似文献
9.
10.