全文获取类型
| 收费全文 | 84篇 |
| 免费 | 2篇 |
专业分类
| 教育 | 48篇 |
| 科学研究 | 16篇 |
| 各国文化 | 1篇 |
| 体育 | 12篇 |
| 信息传播 | 9篇 |
出版年
| 2021年 | 2篇 |
| 2020年 | 2篇 |
| 2019年 | 3篇 |
| 2018年 | 8篇 |
| 2017年 | 2篇 |
| 2016年 | 3篇 |
| 2015年 | 2篇 |
| 2014年 | 1篇 |
| 2013年 | 19篇 |
| 2012年 | 1篇 |
| 2011年 | 3篇 |
| 2008年 | 1篇 |
| 2007年 | 5篇 |
| 2006年 | 1篇 |
| 2004年 | 3篇 |
| 2003年 | 1篇 |
| 2002年 | 2篇 |
| 1999年 | 2篇 |
| 1998年 | 1篇 |
| 1987年 | 1篇 |
| 1985年 | 1篇 |
| 1984年 | 1篇 |
| 1982年 | 2篇 |
| 1981年 | 1篇 |
| 1979年 | 1篇 |
| 1978年 | 1篇 |
| 1977年 | 1篇 |
| 1964年 | 1篇 |
| 1963年 | 1篇 |
| 1959年 | 1篇 |
| 1934年 | 1篇 |
| 1932年 | 1篇 |
| 1918年 | 1篇 |
| 1907年 | 1篇 |
| 1906年 | 1篇 |
| 1905年 | 2篇 |
| 1902年 | 5篇 |
排序方式： 共有86条查询结果，搜索用时 31 毫秒
51.
53.
54.
Frederic E. Ives 《Journal of The Franklin Institute》1902,154(6):441-445
55.
Maughan RJ Depiesse F Geyer H;International Association of Athletics Federations 《Journal of sports sciences》2007,25(Z1):S103-S113
Many athletes use dietary supplements as part of their regular training or competition routine, including about 85% of elite track and field athletes. Supplements commonly used include vitamins, minerals, protein, creatine, and various "ergogenic" compounds. These supplements are often used without a full understanding or evaluation of the potential benefits and risks associated with their use, and without consultation with a sports nutrition professional. A few supplements may be helpful to athletes in specific circumstances, especially where food intake or food choice is restricted. Vitamin and mineral supplements should be used only when a food-based solution is not available. Sports drinks, energy bars, and protein-carbohydrate shakes may all be useful and convenient at specific times. There are well-documented roles for creatine, caffeine, and alkalinizing agents in enhancing performance in high-intensity exercise, although much of the evidence does not relate to specific athletic events. There are potential costs associated with all dietary supplements, including the risk of a positive doping result as a consequence of the presence of prohibited substances that are not declared on the label. 相似文献
56.
57.
58.
The aim of this study was to assess the effects of nicotinamide adenine dinucleotide hydride (NADH) on maximal oxygen uptake (VO2max), maximal anaerobic running time, and mental performance. Eight men were exposed to a supplement treatment (30 mg NADH as ENACHI tablets per day) and to a placebo treatment, each of 4 weeks' duration, in a balanced, double-blind, and cross-over design. The two treatments were separated by a 14-week wash-out period. The results indicated that VO2max, maximal anaerobic running time, and the ability to concentrate were similar in the NADH and placebo conditions. There were also no differences in blood lactate, creatine kinase, reaction time or feelings of fatigue between the treatments. A counter-movement jump performed at rest and 2 min after the aerobic test differed significantly (P 相似文献
59.
60.
Frederic M. Lord 《Journal of Experimental Education》2013,81(4):247-263
The authors investigated predictive relationships among student characteristics that influence motivation for learning and achievement. Participants were students (N = 900) from all 4 grade levels in 18 rural public high schools in the south-western United States. The authors used AMOS 4.0 (J. L. Arbuckle &; W. Wothke, 1996) to test a hypothesized path model in development and validation subsamples. Variables included perceptions of classroom climate, perceived ability, perceived instrumentality of instruction, and achievement goals as predictors of engagement and effort in school. The model fit the data reasonably well, with relatively minor variations in the strength of the paths between subsamples. The authors discuss implications for research and classroom practice. 相似文献