全文获取类型
收费全文 | 1668篇 |
免费 | 23篇 |
国内免费 | 1篇 |
专业分类
教育 | 1110篇 |
科学研究 | 90篇 |
各国文化 | 14篇 |
体育 | 254篇 |
综合类 | 1篇 |
文化理论 | 20篇 |
信息传播 | 203篇 |
出版年
2023年 | 8篇 |
2022年 | 7篇 |
2021年 | 11篇 |
2020年 | 34篇 |
2019年 | 56篇 |
2018年 | 52篇 |
2017年 | 52篇 |
2016年 | 66篇 |
2015年 | 50篇 |
2014年 | 40篇 |
2013年 | 443篇 |
2012年 | 34篇 |
2011年 | 51篇 |
2010年 | 41篇 |
2009年 | 30篇 |
2008年 | 38篇 |
2007年 | 60篇 |
2006年 | 36篇 |
2005年 | 21篇 |
2004年 | 19篇 |
2003年 | 23篇 |
2002年 | 28篇 |
2001年 | 19篇 |
2000年 | 32篇 |
1999年 | 24篇 |
1998年 | 14篇 |
1997年 | 13篇 |
1996年 | 15篇 |
1995年 | 8篇 |
1994年 | 16篇 |
1993年 | 23篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 11篇 |
1989年 | 14篇 |
1988年 | 12篇 |
1987年 | 11篇 |
1986年 | 16篇 |
1985年 | 14篇 |
1984年 | 17篇 |
1983年 | 18篇 |
1982年 | 19篇 |
1981年 | 18篇 |
1980年 | 7篇 |
1979年 | 12篇 |
1978年 | 10篇 |
1977年 | 10篇 |
1975年 | 11篇 |
1973年 | 10篇 |
1972年 | 7篇 |
排序方式: 共有1692条查询结果,搜索用时 15 毫秒
91.
Bob Cowen Norman Evans Hugh Glanville Bruce Williams Rupert Wilkinson 《Higher Education》1993,26(4):471-479
92.
Ben A. Williams 《Learning & behavior》1978,6(4):371-379
Pigeons were trained on a discrete-trial delayed reinforcement procedure with respect to one response key that was periodically illuminated. In some conditions, a second response key, or a tone, both previously paired with reinforcement, was interpolated in the delay-of-reinforcement interval. In comparison to a control condition with neither stimulus in the delay interval, the interpolated stimulus attenuated (blocked) the amount of responding that was maintained by the delayed reinforcement contingency. The degree of blocking was unaffected by whether the interpolated stimulus was the tone or keylight, in spite of the fact that the keylight evoked responding and the tone did not. A second study showed that the blocking effects involved the response-reinforcer association in that blocking occurred when the delayed reinforcement was response-dependent but did not occur when reinforcement was response-independent. The results thus show that response-reinforcer associations are affected by informational variables in the same manner as has been shown for stimulus-reinforcer associations. They also demonstrate that preexisting stimulus-reinforcer associations can block response-reinforcer associations, thus suggesting that both types of association depend upon the same associative process. 相似文献
93.
The purpose of this study was to test the hypothesis that increased availability of blood‐borne glucose would improve endurance after carbohydrate loading. A single‐leg exercise model was employed, taking advantage of the fact that supercompensation of muscle glycogen occurs only in a previously exercised limb. Endurance time to exhaustion at 70% of maximal oxygen uptake (VO2max) was determined for 11 males and three females who were then allocated to a control group or a high‐carbohydrate (CHO) group. For 3 days following Test 1 the control group maintained a prescribed normal diet whilst the CHO group increased the proportion of energy derived from carbohydrate (62.1 ± 4.3% cf. 43.9 ± 2.0%, P < 0.01). The endurance test was then repeated using the leg that was inactive during Test 1. Endurance time was increased on Test 2 (123.7 ± 43.2 min cf. 98.5 ± 21.9 min, P <0.05 one‐tailed test) for the CHO group but not for the control group (101.8 ± 21.7 min cf. 107.5 ± 9.1 min, NS). There was no indication of enhanced carbohydrate metabolism during Test 2 for the CHO group but mean heart rate was lower during Test 2 than during Test 1 (145 ± 14 beat min ‐1 cf. 152 ± 12 beat min ‐1, P<0.05). These results suggest that the prior consumption of a high‐carbohydrate diet improves endurance during high‐intensity cycling with a limb with normal muscle glycogen concentration. 相似文献
94.
95.
Brenda Williams 《Clearing house (Menasha, Wis.)》2013,86(4):128-135
Middle school students from military families face unique challenges, especially when their parents are deployed. Among the challenges they experience are frequent relocations; issues that affect academic achievement; uncertainty; and changes in roles, responsibilities, and relationships at home. Reunification involves issues of the returning parent's reintegration into the family, reacquainting with children, and recuperation. This article highlights the need for educators to recognize the unique matters surrounding military students, particularly those whose parents are deployed. It focuses on students’ needs, challenges faced by families and schools, and support mechanisms in place. Implications for practice and strategies for schools to use are provided. 相似文献
96.
League tables that rank universities may use reputational measures, performance measures, or both. Each type of measure has
strengths and weaknesses. In this paper, we rank disciplines in Australian universities both by reputation, using an international
survey of senior academics, and with actual performance measures. We then compare the two types of measures to see how closely
they match. The criterion we use for both sets of measures is ‘international academic standing’. We find a high correlation
between the survey results and the various measures of research performance. We also find a correlation between the quality
of student intake and the survey rankings, but the satisfaction levels of recent graduates do not correlate well with the
rankings by academics. We then construct an overall measure of performance, which gives very similar rankings to the survey
results, especially for the top-ranked institutions.
相似文献
Ross WilliamsEmail: |
97.
98.
The purpose of this study was to test the hypothesis that increased availability of blood-borne glucose would improve endurance after carbohydrate loading. A single-leg exercise model was employed, taking advantage of the fact that supercompensation of muscle glycogen occurs only in a previously exercised limb. Endurance time to exhaustion at 70% of maximal oxygen uptake (VO2 max) was determined for 11 males and three females who were then allocated to a control group or a high-carbohydrate (CHO) group. For 3 days following Test 1 the control group maintained a prescribed normal diet whilst the CHO group increased the proportion of energy derived from carbohydrate (62.1 +/- 4.3% cf. 43.9 +/- 2.0%, P less than 0.01). The endurance test was then repeated using the leg that was inactive during Test 1. Endurance time was increased on Test 2 (123.7 +/- 43.2 min cf. 98.5 +/- 21.9 min, P less than 0.05 one-tailed test) for the CHO group but not for the control group (101.8 +/- 21.7 min cf. 107.5 +/- 9.1 min, NS). There was no indication of enhanced carbohydrate metabolism during Test 2 for the CHO group but mean heart rate was lower during Test 2 than during Test 1 (145 +/- 14 beat min-1 cf. 152 +/- 12 beat min-1, P less than 0.05). These results suggest that the prior consumption of a high-carbohydrate diet improves endurance during high-intensity cycling with a limb with normal muscle glycogen concentration. 相似文献
99.
100.