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121.
Jordan J. Smith Philip J. Morgan Ronald C. Plotnikoff David F. Stodden David R. Lubans 《Journal of sports sciences》2016,34(8):772-779
The purpose of this study was to examine the mediating effect of resistance training skill competency on percentage of body fat, muscular fitness and physical activity among a sample of adolescent boys participating in a school-based obesity prevention intervention. Participants were 361 adolescent boys taking part in the Active Teen Leaders Avoiding Screen-time (ATLAS) cluster randomised controlled trial: a school-based program targeting the health behaviours of economically disadvantaged adolescent males considered “at-risk” of obesity. Body fat percentage (bioelectrical impedance), muscular fitness (hand grip dynamometry and push-ups), physical activity (accelerometry) and resistance training skill competency were assessed at baseline and post-intervention (i.e., 8 months). Three separate multi-level mediation models were analysed to investigate the potential mediating effects of resistance training skill competency on each of the study outcomes using a product-of-coefficients test. Analyses followed the intention-to-treat principle. The intervention had a significant impact on the resistance training skill competency of the boys, and improvements in skill competency significantly mediated the effect of the intervention on percentage of body fat and the combined muscular fitness score. No significant mediated effects were found for physical activity. Improving resistance training skill competency may be an effective strategy for achieving improvements in body composition and muscular fitness in adolescent boys. 相似文献
122.
Daniel D. Bingham Silvia Costa Stacy A. Clemes Ash C. Routen Helen J. Moore Sally E. Barber 《Journal of sports sciences》2016,34(20):2005-2010
This study presents a worked example of a stepped process to reliably estimate the habitual physical activity and sedentary time of a sample of young children. A total of 299 children (2.9 ± 0.6 years) were recruited. Outcome variables were daily minutes of total physical activity, sedentary time, moderate to vigorous physical activity and proportional values of each variable. In total, 282 (94%) provided 3 h of accelerometer data on ≥1 day and were included in a 6-step process: Step-1: determine minimum wear-time; Step-2: process 7-day-data; Step-3: determine the inclusion of a weekend day; Step-4: examine day-to-day variability; Step-5: calculate single day intraclass correlation (ICC) (2,1); Step-6: calculate number of days required to reach reliability. Following the process the results were, Step-1: 6 h was estimated as minimum wear-time of a standard day. Step-2: 98 (32%) children had ≥6 h wear on 7 days. Step-3: no differences were found between weekdays and weekend days (P ≥ 0.05). Step-4: no differences were found between day-to-day variability (P ≥ 0.05). Step-5: single day ICC’s (2,1) ranged from 0.48 (total physical activity and sedentary time) to 0.53 (proportion of moderate to vigorous physical activity). Step-6: to reach reliability (ICC = 0.7), 3 days were required for all outcomes. In conclusion following a 7 day wear protocol, ≥6 h on any 3 days was found to have acceptable reliability. The stepped-process offers researchers a method to derive sample-specific wear-time criterion. 相似文献
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为了更好发挥大学体育课程改革对大学生体质健康促进的作用,采用文献调研、数理统计以及逻辑分析等方法,以大学体育课程改革与学生体质健康促进的关系为研究对象,分析福建师范大学新旧课改对学生体质健康促进的积极和消极影响,总结出大学体育课程改革项目与学生体质健康状况的紧密联系,从而进一步推进大学体育课程的创新与发展,促进两者间的有序耦合与协调发展,为促进学生体质健康提供参考意见。 相似文献
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体感游戏作为体育运动与电子科技的结合产品,对其在青少年体力活动干预方面的研究有重要意义。研究从体力活动的促进、能量消耗、运动康复、社会价值以及心理效应等方面对体感游戏进行分析,发现体感游戏对青少年体力活动有明显促进作用,能满足其锻炼的需求,且对青少年心理健康具有积极地影响,能作为青少年体力活动干预的有效手段之一。 相似文献
127.
实施<全国普通高等学校体育课程教学指导纲要>,要重视体育课程内容的体育文化含量.课程内容的体育文化,除学科本身的理论、技能外,还应包括新的教学观及与体育相关的德育、美育文化等,并把几者结合成一个有机的整体.在教学实践中,坚持文化的统一性,注重教学内容的科学性和系统性;体现"以人为本"的文化特征,课程设置要把学生主体和课程客体统一起来,并使学生学习的积极性和创造性得到发挥. 相似文献
128.
学校体育实施终身体育教育的途径和方法 总被引:1,自引:0,他引:1
从新的体育课程标准入手 ,对终身体育者的标准、特征和影响终身体育因素进行了论述和分析 ,提出学校体育应从体育教学和课外体育活动等方面培养学生的终身体育意识和能力。 相似文献
129.
低温胁迫下镧对水稻种子萌发的影响 总被引:3,自引:0,他引:3
以水稻(Oryza sativa)种子为实验材料,研究了不同浓度稀土元素镧浸种对水稻种子低温萌发的影响。结果表明:15℃低温胁迫抑制水稻种子的萌发,浸种期用硝酸镧处理能够提高种子的抗逆性。低浓度((50~250)×10-6mol/L)硝酸镧浸种能提高水稻种子发芽率、发芽势、呼吸速率和过氧化氢酶活性,提高种子抗寒能力,实验发现用硝酸镧处理种子萌发以250×10-6mol/L浓度为最佳,低温胁迫下,发芽率提高9.67%,呼吸速率提高56.25%,过氧化氢酶活性提高1.73%。350×10-6mol/L以上高浓度对水稻种子的萌发无明显影响。 相似文献
130.
章主要阐述基础教育课程改革所倡导的活动式教学方法的特点和优越性,并探讨了如何在英语教学中采用活动式教学方法。 相似文献