全文获取类型
| 收费全文 | 1537篇 |
| 免费 | 25篇 |
| 国内免费 | 1篇 |
专业分类
| 教育 | 1182篇 |
| 科学研究 | 73篇 |
| 各国文化 | 23篇 |
| 体育 | 115篇 |
| 综合类 | 1篇 |
| 文化理论 | 10篇 |
| 信息传播 | 159篇 |
出版年
| 2022年 | 9篇 |
| 2021年 | 15篇 |
| 2020年 | 23篇 |
| 2019年 | 40篇 |
| 2018年 | 72篇 |
| 2017年 | 75篇 |
| 2016年 | 71篇 |
| 2015年 | 32篇 |
| 2014年 | 44篇 |
| 2013年 | 356篇 |
| 2012年 | 43篇 |
| 2011年 | 46篇 |
| 2010年 | 30篇 |
| 2009年 | 41篇 |
| 2008年 | 37篇 |
| 2007年 | 30篇 |
| 2006年 | 27篇 |
| 2005年 | 23篇 |
| 2004年 | 25篇 |
| 2003年 | 19篇 |
| 2002年 | 21篇 |
| 2001年 | 18篇 |
| 2000年 | 26篇 |
| 1999年 | 14篇 |
| 1998年 | 14篇 |
| 1997年 | 24篇 |
| 1996年 | 19篇 |
| 1994年 | 9篇 |
| 1993年 | 18篇 |
| 1992年 | 20篇 |
| 1991年 | 22篇 |
| 1990年 | 17篇 |
| 1989年 | 21篇 |
| 1988年 | 16篇 |
| 1987年 | 26篇 |
| 1986年 | 15篇 |
| 1985年 | 9篇 |
| 1984年 | 7篇 |
| 1983年 | 9篇 |
| 1982年 | 12篇 |
| 1981年 | 8篇 |
| 1980年 | 7篇 |
| 1979年 | 11篇 |
| 1978年 | 9篇 |
| 1977年 | 16篇 |
| 1976年 | 7篇 |
| 1975年 | 11篇 |
| 1974年 | 10篇 |
| 1973年 | 8篇 |
| 1971年 | 10篇 |
排序方式： 共有1563条查询结果，搜索用时 13 毫秒
51.
52.
Leisure time physical activity in Australian women: relationship with well being and symptoms 总被引：5，自引：0，他引：5
This paper explores the association between moderate levels of physical activity (PA) and health benefits in well being and symptoms such as tiredness, back pain, and constipation. Participants in the Australian Longitudinal Study on Women's Health, 14,502 young women (ages 18-23 years), 13,609 middle-age women (45-50 years), and 11,421 older women (ages 70-75 years), answered questions about vigorous and less vigorous exercise (used to determine a physical activity score), well being (SF-36), symptoms, and medical conditions. There were significant associations between the PA score and SF-36 in each cohort. Odds ratios (OR) for a range of symptoms and conditions were lower for women who reported low to moderate activity than for sedentary women, for example, for young women or for constipation = 0.76 (CI, 0.65-0.89), for middle-age women or for tiredness = 0.70 (0.63-0.78). There was no threshold of PA at which health benefits increased significantly. Although cross-sectional, the findings suggest that low-to-moderate levels of exercise are associated with a range of health benefits for women of all ages. These preliminary findings will be followed up during the longitudinal study. 相似文献
53.
54.
55.
56.
57.
58.
It is often desirable to represent carrier distribution systems by networks so that analysis can be made to predict the behavior of these systems. Modeling of two canonical carrier distribution systems, the star-shaped system and the parallel-wire system by networks was carried out in this paper. The representation is given in terms of lumped parameters when the lengths of the carrier lines are short and it is given in terms of lumped and distributed parameters when the lengths of the carrier lines are long. 相似文献
59.
60.