全文获取类型
收费全文 | 2170篇 |
免费 | 54篇 |
国内免费 | 17篇 |
专业分类
教育 | 1403篇 |
科学研究 | 258篇 |
各国文化 | 2篇 |
体育 | 332篇 |
综合类 | 174篇 |
信息传播 | 72篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 27篇 |
2021年 | 75篇 |
2020年 | 66篇 |
2019年 | 49篇 |
2018年 | 40篇 |
2017年 | 51篇 |
2016年 | 54篇 |
2015年 | 54篇 |
2014年 | 171篇 |
2013年 | 188篇 |
2012年 | 139篇 |
2011年 | 179篇 |
2010年 | 120篇 |
2009年 | 114篇 |
2008年 | 128篇 |
2007年 | 155篇 |
2006年 | 110篇 |
2005年 | 124篇 |
2004年 | 103篇 |
2003年 | 92篇 |
2002年 | 51篇 |
2001年 | 44篇 |
2000年 | 25篇 |
1999年 | 22篇 |
1998年 | 7篇 |
1997年 | 8篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有2241条查询结果,搜索用时 15 毫秒
71.
72.
董月芬 《石家庄职业技术学院学报》2009,21(2):36-37,54
目前一些大型水库相继出现藻类水华,对饮用水安全构成了威胁.通过对北方几座大型水库水体的浮游生物进行调查,提出了水华的防治措施:加强水源防护、进行深度处理、挖底泥、人工或机械捞取、采用化学方法、修复污染水体等. 相似文献
73.
高等体育院校投掷专项本科生运动损伤的调查分析及其预防 总被引:1,自引:0,他引:1
程昊 《山东体育学院学报》2006,22(4):66-67,71
1前言投掷项目包括推铅球、掷铁饼、掷标枪和掷链球。虽然各项目中的器械形状、重量以及技术形式各不相同,但合理的技术动作都遵循着共同的规律。按项群理论的划分,投掷运动属于体能主导类快速力量性项目。投掷运动中各项目的技术动作过程均是由握持器械、助跑、最后用力、缓冲 相似文献
74.
我国排球运动员的损伤研究(综述) 总被引:20,自引:0,他引:20
排球运动是世界上流行的运动项目之一,排球运动员的损伤率估计在二到五人每一千训练比赛小时,主要的损伤部位是在肩、腰、膝、踝等部位,运动损伤方面的研究目前还不成体系,因为各研究的损伤标准不一。为了减少运动损伤的发生率,从内外两个方面综述运动损伤发生的原因及其预防措施。 相似文献
75.
Satoru Hashizume Hiroaki Hobara Yoshiyuki Kobayashi 《European Journal of Sport Science》2019,19(6):757-764
Negative work, which is mainly generated by eccentric muscle contraction, has an important influence on the associated muscle damage. Generally, mechanical parameters are determined for one side of a lower extremity on the assumption of negligible between-limb differences. However, between-limb differences in the negative work of lower extremity joints during running remain unclear. This study examines between-limb differences in negative work and associated mechanical parameters during the contact phase of running. Twenty-five young adult males voluntarily participated in this study. Each participant was asked to run on a straight runway at a speed of 3.0?m?s?1. Negative work, amplitude, duration of negative power, moment, and angular velocity were computed for both sides of the lower extremities. Significant differences were found in negative work between limbs for the hip (18.9?±?11.7%), knee (13.6?±?10.4%), and ankle (11.8?±?8.5%) joints. For the hip joint, asymmetric negative work was attributable to the between-limb difference in the amplitude of negative power owing to a corresponding difference in the moment. The between-limb differences concerning the duration and amplitude of negative power could explain the asymmetric negative work in the knee joint. The asymmetric negative work of the ankle joint was attributable to the between-limb difference in the amplitude and duration of the negative power and the moment. These results indicate that asymmetric negative work was generated in each lower extremity joint; however, the major mechanical parameters corresponding to the negative work are not the same across the joints. 相似文献
76.
徐建清 《河北体育学院学报》2019,33(6):78-85
为有效预防竞技运动损伤,促进业界重视心理因素在预防损伤中的作用,对国外竞技运动损伤心理预防的概念模型和框架进行梳理,发现各类心理因素对发生运动损伤的影响路径被进一步整合和细化,不同水平层次的社会心理学因素开始受到重视,无论是特质理论还是应激—损伤理论、行动理论、状态理论,都强调了压力反应这一重要变量,全面、多方位考察风险文化和行为以及生物心理社会因素互动的理论视角是该主题未来的趋势。未来需要规范运动损伤的定义和测量方法,有必要开展运动员及其有关情况的针对性调查,还应该注重重复测量研究设计以及使用被忽视的结构方程模型检验变量的中介效应。 相似文献
77.
王桢 《河北体育学院学报》2019,33(1):19-27
近年来,性侵运动员的犯罪行为频发,成为国际社会聚焦的热点。以此审视我国运动员性法益的保护,虽有强奸罪、强制猥亵罪的刑事立法,却缺乏对该犯罪行为特殊性的深入思考,既不能在惩治犯罪人方面达到理想效果,亦不能在预防犯罪方面发挥良好功能。同时,司法中的“以纪代法”、针对性缺乏、未回应被害人需求等诸多问题,亦使该犯罪行为的刑事规制效果大打折扣。所以,在该犯罪立法上应有针对性采用附属刑法进行修正,完善犯罪的特别预防与一般预防制度;司法上,积极回应被害人的诉求,努力克服刑事规制过程中的各种困境,让运动员的性法益得到全面而充分的保护。 相似文献
78.
Roman Farana Gerda Strutzenberger Timothy Exell Jiri Skypala Huw Wiltshire Gareth Irwin 《Journal of sports sciences》2019,37(13):1449-1456
The aim of the study was to determine if sex differences exist in the key elbow and wrist joint injury risk factors during different cartwheel (CW) and round-off (RO) techniques performed by young male and female artistic gymnasts. Sixteen active young gymnasts (8 males and 8 females) performed 30 successful trials of CW and RO with three different hand positions (parallel (10), T-shape (10) and reverse (10)). Synchronised kinematic and kinetic data were collected for each trial. Two-way repeated measures ANOVA (3 × 2, technique × sex) and effect-sizes (ES) were used for statistical analysis. In conclusion, female gymnasts exhibited greater normalised peak vertical ground reaction forces (VGRF), elbow and wrist compression forces and elbow internal adduction moments during CW and RO skills compared with male gymnasts. In both sexes, the parallel and reverse techniques increased peak VGRF, elbow and wrist compression forces and the elbow internal adduction moment. Increased elbow flexion resulted in decreased peak VGRF, elbow compression forces and elbow internal adduction moment. Injury risk factors including elbow extension and internal adduction moment with axial compression force suggest that a CW and RO in reverse and parallel techniques can be hazardous especially for young female gymnasts. 相似文献
79.
Abdallah Rejeb Amanda Johnson Roel Vaeyens Cosmin Horobeanu Abdulaziz Farooq Erik Witvrouw 《European Journal of Sport Science》2017,17(4):495-502
The present investigation was carried out to examine the incidence and pattern of injuries in adolescent multisport athletes from youth sports academy. Injury data were prospectively collected from 166 athletes during the seasons from 2009 to 2014. A total of 643 injuries were identified, 559 (87.0%) were time-loss injuries. The overall injury incidence was 5.5 (95% confidence interval CI: 5.1–6.0), the incidence of time-loss injuries was 4.8 (95% CI: 4.4–5.2), the incidence of growth conditions was 1.2 (95% CI: 1.0–1.4) and incidence of serious injuries was 0.6 (95% CI: 0.5–0.8) per 1000?h of exposure. The prevalence of overuse injuries was 50.3%. Growth conditions represented 20.0%. Most of the injuries (67.0%) involved the lower extremities, and both foot and ankle were the most predominant injured body parts (22.0%). Knee injuries were mostly from overuse (50 vs. 23, p?=?.02), whereas foot and ankle injuries resulted from an acute mechanism (94 vs. 31, p?<?.0001). Minor and moderate injuries accounted for 87.0%. Muscle, tendon and osteochondrosis injuries accounted for 52.0% of all injuries. Comparing groups, squash sport was having the highest injury incidence (8.5 injuries per athlete). Higher exposure was associated with greater overuse relative risk (RR?=?1.03, 95% CI: 1.01–1.014, p?<?.001). In conclusion, the results of this study identified a high incidence of injuries in this youth sports population. Striking was the prevalence of overuse injuries of 50%, which suggests the need for injury prevention protocols for adolescent highly trained athletes. 相似文献
80.
Sentaro Koshida Takanori Ishii Tadamitsu Matsuda Toshihiko Hashimoto 《European Journal of Sport Science》2017,17(4):417-424
It is generally accepted that proper learning of the breakfall technique during early judo training is essential for attenuating the risk of judo-related head injury. Therefore, it is critical to understand the kinematics and head injury risks of breakfall motion to design a more safe and effective judo teaching paradigm that results in reduction of injury risk. We aimed to investigate the biomechanics of judo backward breakfalls by comparing osoto-gari and ouchi-gari in novice judokas. Twelve male novice judokas (age: 21.3 years, SD?=?0.6 years; height: 1.74?m, SD?=?0.04?m; body weight: 71.3, SD?=?6.4?kg; body mass index: 23.5, SD?=?2.3) volunteered to participate in this study. The kinematic data of the breakfall motion for both osoto-gari and ouchi-gari were collected using a three-dimensional motion analysis technique (200?Hz). We observed significant differences between the movement patterns for the two techniques, especially in the lower extremity movements. In addition, a significantly greater peak extension momentum (osoto-gari: 1.29, SD?=?0.23?kg?m2?s?1; ouchi-gari: 0.84, SD?=?0.29?kg?m2?s?1) and lower head position along the vertical axis (osoto-gari: 0.18, SD?=?0.05?m; ouchi-gari: 0.31, SD?=?0.08?m) with a large effect size were found in the breakfall for osoto-gari. Our results suggest that a different paradigm is needed for effectively teaching each breakfall technique that will enable us to substantially lower the risk of judo-related head injuries in novice judokas. 相似文献