全文获取类型
| 收费全文 | 293篇 |
| 免费 | 3篇 |
专业分类
| 教育 | 215篇 |
| 科学研究 | 9篇 |
| 各国文化 | 1篇 |
| 体育 | 35篇 |
| 文化理论 | 2篇 |
| 信息传播 | 34篇 |
出版年
| 2020年 | 3篇 |
| 2019年 | 8篇 |
| 2018年 | 14篇 |
| 2017年 | 18篇 |
| 2016年 | 16篇 |
| 2015年 | 5篇 |
| 2014年 | 11篇 |
| 2013年 | 61篇 |
| 2012年 | 4篇 |
| 2011年 | 7篇 |
| 2010年 | 4篇 |
| 2009年 | 5篇 |
| 2008年 | 12篇 |
| 2007年 | 7篇 |
| 2006年 | 7篇 |
| 2005年 | 2篇 |
| 2004年 | 9篇 |
| 2003年 | 2篇 |
| 2002年 | 3篇 |
| 2001年 | 12篇 |
| 2000年 | 3篇 |
| 1999年 | 4篇 |
| 1995年 | 4篇 |
| 1992年 | 2篇 |
| 1991年 | 5篇 |
| 1990年 | 6篇 |
| 1989年 | 4篇 |
| 1988年 | 1篇 |
| 1987年 | 1篇 |
| 1986年 | 5篇 |
| 1985年 | 9篇 |
| 1984年 | 3篇 |
| 1983年 | 3篇 |
| 1982年 | 2篇 |
| 1981年 | 5篇 |
| 1980年 | 4篇 |
| 1979年 | 1篇 |
| 1978年 | 1篇 |
| 1977年 | 2篇 |
| 1976年 | 1篇 |
| 1975年 | 1篇 |
| 1974年 | 2篇 |
| 1973年 | 1篇 |
| 1972年 | 1篇 |
| 1971年 | 1篇 |
| 1970年 | 2篇 |
| 1967年 | 2篇 |
| 1965年 | 1篇 |
| 1939年 | 2篇 |
| 1927年 | 1篇 |
排序方式： 共有296条查询结果，搜索用时 31 毫秒
1.
2.
3.
4.
Larry A. Tucker 《Journal of sports sciences》2020,38(9):1026-1035
ABSTRACTThe length of telomeres is an objective measure of biologic ageing. This study evaluated the extent minutes of walking per week are associated with leukocyte telomere length (LTL) in a random sample of 5,823 U.S. adults. The investigation was cross-sectional and data were obtained from the National Health and Nutrition Examination Survey (NHANES). LTL was measured by the quantitative polymerase chain reaction method. Walking minutes was calculated from walking frequency and duration measures. Results showed that for each year of chronological age, telomeres were 15.6 base pairs shorter (P < 0.0001). With walking minutes and LTL treated as continuous variables, the relationship was quadratic, not linear (F = 11.2, P = 0.0023). With walking time divided into three categories, adults who performed ≥ 150 minutes of walking per week had longer telomeres than those who did no regular walking, and those who did some, but less than the recommendation (F = 5.0, P = 0.0137). Regular walkers were estimated to have a biologic ageing advantage associated with 6.5–7.6 years less biologic ageing compared to non-walkers, after adjusting for covariates. Additional investigations designed to study causality and the mechanisms associated with the walking and LTL relationship are needed. 相似文献
5.
6.
7.
Mooses and colleagues suggest that running economy alone does not explain superior distance running performance in elite Kenyan runners. Whilst we agree with the multi-factorial hypothesis for Kenyan running success, we do not believe that running economy can be overlooked to the extent that it was based on this particular study. Based on the methods used and the range of athletes tested, in this response letter we question whether this study provides any basis for downplaying the influence of running economy or suggesting that other factors compensate for it to enable superior performance. 相似文献
8.
9.
10.
Beatrice S. Bartlett 《Archival Science》2007,7(4):369-390
This article describes the first half century of the Communist government’s supervision and management of the central-government
archives of the last two dynasties. Immediately with the Communist ascent to power in 1949, the new government took great
interest in assembling and protecting the country’s archival documents, readying the Ming-Qing archives for access to scholars,
and preparing for publication of selected materials. By the 1980s Beijing’s Number One Historical Archives, in charge of the
largest holding of Ming-Qing documents, had become the first Chinese authority to complete a full sorting and preliminary
catalogues for such a collection. Moreover, to facilitate searches, an attempt has recently begun to create a subject-heading
system for these and other holdings in the country. In the first half century’s final decades, foreign researchers were admitted
for the first time and tours and international exchanges began to take place.
相似文献
| Beatrice S. BartlettEmail: |