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It is well known that sport and exercise play an important role in stimulating site-specific bone mineral density (BMD). However, what is less well understood is how these benefits dissipate throughout the body. Hence, the aim of the present study was to compare the BMD (recorded at nine sites throughout the skeleton) of 106 male athletes (from nine sports) with that of 15 male non-exercising age-matched controls. Given that BMD is known to increase with body mass and peak with age, multivariate and univariate analyses of covariance were performed to compare the BMD of the nine sports groups with controls (at all sites) using body mass and age as covariates. Our results confirmed a greater adjusted BMD in the arms of the upper-body athletes, the right arm of racket players and the legs of runners (compared with controls), supporting the site-specific nature (i.e. specific to the externally loaded site) of the bone remodelling response (all P <0.01). However, evidence that bone mass acquisition is not just site-specific comes from the results of the rugby players, strength athletes, triathletes and racket players. The rugby players' adjusted BMD was the greatest of all sports groups and greater than controls at all nine sites (all P <0.01), with differences ranging from 8% greater in the left arm to 21% in the lumbar spine. Similarly, the strength athletes' adjusted BMD was superior to that of controls at all sites (P <0.05) except the legs. The adjusted BMD of the triathletes was significantly greater than that of the controls in both the arms and the legs as well as the thoracic and lumbar spine. The racket players not only had significantly greater right arm BMD compared with the controls but also a greater BMD of the lumbar spine, the pelvis and legs. In contrast, the low-strain, low-impact activities of keep-fit, cycling and rowing failed to benefit BMD compared with the age-matched controls. These results suggest that sporting activities involving high impact, physical contact and/or rotational forces or strains are likely to convey significant benefits not only to the loaded sites, but also to other unloaded peripheral and axial sites throughout the skeleton. 相似文献
187.
University‐level courses in science that contain a substantial practicum or laboratory component have always been a problem to deliver through distance education. Because of the potential hazards inherent in the equipment and chemicals commonly used, chemistry is among the more challenging disciplines to teach at a distance. Athabasca University (AU) ‐ Canada's Open University ‐ has been successfully running chemistry courses for over two decades. The development and delivery of AU chemistry courses are described and the approaches that have been developed to meet the challenges of a North American distance‐education university, including the use of new technologies, are discussed. The problems associated with providing distance students with appropriate laboratory experience are also examined. The first‐year general chemistry courses are compared to an equivalent course at a neighbouring traditional university and an analysis of student performance in AU chemistry courses is presented. 相似文献
188.
Arthur Tatnall 《Education and Information Technologies》2014,19(3):549-564
People over 65 (or older people) are a growing proportion of the population in many developed countries including Australia. In the last 10 to 12 years interest from this group in the use of Information and Communication Technologies (ICT) and the Internet has also grown considerably. ICT has much to offer older people as a means of keeping in touch with family, perhaps in other parts of the world, to obtain information about health and financial matters, for entertainment and to further their education. It also offers possibilities for intergenerational cooperation with, for example, children coaching their grandparents. This paper concentrates on older people’s use of ICT for education, some of this being formal but mostly informal, and adopts a socio-technical framework based on actor-network theory (ANT) to investigate this. 相似文献
189.
Bosma Evelyn Bakker Arthur Zenger Linda Blom Elma 《European Journal of Psychology of Education - EJPE》2023,38(1):225-247
European Journal of Psychology of Education - In this review, we evaluate the claim that translanguaging in the classroom supports the development of the bilingual lexicon by enhancing... 相似文献
190.
Arthur Henrique Bossi Pedro Lima Jorge Perrout de Lima James Hopker 《Journal of sports sciences》2017,35(14):1364-1371
ABSTRACTThis study aimed to assess the relationship between an uphill time-trial (TT) performance and both aerobic and anaerobic parameters obtained from laboratory tests. Fifteen cyclists performed a Wingate anaerobic test, a graded exercise test (GXT) and a field-based 20-min TT with 2.7% mean gradient. After a 5-week non-supervised training period, 10 of them performed a second TT for analysis of pacing reproducibility. Stepwise multiple regressions demonstrated that 91% of TT mean power output variation (W kg?1) could be explained by peak oxygen uptake (ml kg?1.min?1) and the respiratory compensation point (W kg?1), with standardised beta coefficients of 0.64 and 0.39, respectively. The agreement between mean power output and power at respiratory compensation point showed a bias ± random error of 16.2 ± 51.8 W or 5.7 ± 19.7%. One-way repeated-measures analysis of variance revealed a significant effect of the time interval (123.1 ± 8.7; 97.8 ± 1.2 and 94.0 ± 7.2% of mean power output, for epochs 0–2, 2–18 and 18–20 min, respectively; P < 0.001), characterising a positive pacing profile. This study indicates that an uphill, 20-min TT-type performance is correlated to aerobic physiological GXT variables and that cyclists adopt reproducible pacing strategies when they are tested 5 weeks apart (coefficients of variation of 6.3; 1 and 4%, for 0–2, 2–18 and 18–20 min, respectively). 相似文献