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61.
Lars Willnat W. Joann Wong Ezhar Tamam Annette Aw 《Mass Communication and Society》2013,16(4):557-585
This study is based on a survey of 526 adult Malaysians who were interviewed shortly before the 2008 national election about online media use, levels of political participation, and voting intentions. The goal was to document the role of online media in a society that controls political information in traditional media and, in turn, compels citizens to seek alternative news sources online. As predicted, the findings indicated that online media use was positively associated with higher levels of political participation among Malaysian voters. The use of and exposure to social networking sites, political blogs, political online videos, party websites, and political ads on cell phones showed strong associations with political activism. However, the use of political online media did not predict voters’ likelihood of voting. 相似文献
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James D. George Danielle I. Bradshaw Annette Hyde Pat R. Vehrs Ronald L. Hager Frank G. Yanowitz 《Measurement in physical education and exercise science》2013,17(3):149-160
The purpose of this study was to develop an age-generalized regression model to predict maximal oxygen uptake (VO2max) based on a maximal treadmill graded exercise test (GXT; George, 1996). Participants (N?=?100), ages 18–65 years, reached a maximal level of exertion (mean?±?standard deviation [SD]; maximal heart rate [HRmax]?=?185.2?±?12.4 beats per minute (bpm); maximal respiratory exchange ratio [RERmax]?=?1.18?±?0.05; maximal rating of perceived exertion (RPEmax)?=?19.1?±?0.7) during the GXT to assess VO2max (mean?±?SD; 40.24?±?9.11 mL·kg?1·min?1). Multiple linear regression generated the following prediction equation (R?=?.94, standard error of estimate [SEE]?=?3.18 mL·kg?1·min?1, %SEE?=?7.9): VO2max (mL·kg?1·min?1)?=?13.160?+?(3.314 × gender; females?=?0, males?=?1) ? (.131 × age) ? (.334 × body mass index (BMI))?+?(5.177 × treadmill speed; mph)?+?(1.315 × treadmill grade; %). Cross validation using predicted residual sum of squares (PRESS) statistics revealed minimal shrinkage (Rp ?=?.93 and SEE p ?=?3.40 mL·kg?1·min?1); consequently, this model should provide acceptable accuracy when it is applied to independent samples of comparable adults. Standardized β-weights indicate that treadmill speed (.583) was the most effective at predicting VO2max followed by treadmill grade (.356), age (?.197), gender (.183), and BMI (?.148). This study provides a relatively accurate regression model to predict VO2max in relatively fit men and women, ages 18–65 years, based on maximal exercise (treadmill speed and grade), biometric (BMI), and demographic (age and gender) data. 相似文献
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Philip von Rosen Oskar Olofsson Sebastian Väsbom Annette Heijne 《European Journal of Sport Science》2019,19(5):707-716
The primary aim of this cross-sectional study was to compare subjective correlates of health, such as nutrition, self-esteem, sleep and stress, between adolescent elite athletes (n?=?625) and a reference group of adolescents (n?=?391) not involved in elite sports. A secondary aim was to study predictors for self-perceived stress. A questionnaire was e-mailed to all participants containing valid questions about competence-based self-esteem, nutrition, self-perceived stress and sleep. Our results show that adolescent elite athletes reported significantly (p?.001) lower self-perceived stress, competence-based self-esteem, a more varied diet and more time of sleep, compared to adolescents not involved in elite sports (Hedges’g 0.31–0.82). Female adolescent elite athletes and female adolescents, compared to their male peer group, reported poorer values for competence-based self-esteem (elite, Hedges’g 0.29; adolescents, Hedges’g 0.30) and self-perceived stress (elite, Hedges’g 0.63; adolescents, Hedges’g 0.60). The linear mixed effect model revealed several significant (p?.05) predictors (sex, general well-being, competence-based self-esteem, sleep during weekdays, BMI, training volume) associated with self-perceived stress in adolescent elite athletes. In conclusion, differences in correlates of health with a moderate to strong effect sizes were found between the two groups, where elite athletes surprisingly reported less stress, competence-based self-esteem, a more varied diet and more time of sleep. Even if injury risk is high in adolescent elite athletes and pressure from multiple stakeholders is evident, it appears that the athletes still have better conditions for a good subjective health, based on self-reported measures, compared to adolescents not involved in elite sports. 相似文献
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