排序方式： 共有65条查询结果，搜索用时 156 毫秒
61.
Considerable research has focused on how best to satisfy modern societies’ needs for skilled labour in the field of science. The present study evaluated an intervention programme designed to increase secondary school students’ motivation to pursue a science career. Students from 3 schools of the highest educational track participated for up to 2 years in the intervention programme, which was implemented as an elective in the school curriculum. Our longitudinal study design for evaluating the effectiveness of the intervention programme included all students at the grade levels involved in the programme with students who did not participate serving as a control group. Mixed-model analyses of variance showed none of the intended effects of the intervention programme on science motivation; latent growth models corroborated these results. When the programme began, students who enrolled in the science elective (n?=?92) were already substantially more motivated than their classmates (n?=?228). Offering such an intervention programme as an elective did not further increase the participating students’ science motivation. It seems worthwhile to carry out intervention programmes with talented students who show (comparatively) little interest in science at the outset rather than with highly motivated students who self-select into the programme. 相似文献
62.
Vogt S Schumacher YO Blum A Roecker K Dickhuth HH Schmid A Heinrich L 《Journal of sports sciences》2007,25(12):1299-1305
Until recently, the physiological demands of cycling competitions were mostly reflected by the measurement of heart rate and the indirect estimation of exercise intensity. The purpose of this case study was to illustrate the varying power output of a professional cyclist during flat and mountain stages of a Grand Tour (Giro d'Italia). Nine stage recordings of a cyclist of the 2005 Giro d'Italia were monitored using a mobile power measurement device (SRM Trainingssystem, Julich, Germany), which recorded direct power output and heart rate. Stages were categorized into flat (n = 5) and mountain stages (n = 4). Data were processed electronically, and the overall mean power in flat and mountain stages and maximal mean power for various durations were calculated. Mean power output was 132 W +/- 26 (2.0 W x kg(-1) +/- 0.4) for the flat and 235 W +/- 10 (3.5 W x kg(-1) +/- 0.1) for the mountain stages. Mountain stages showed higher maximal mean power (367 W) for longer durations (1800 s) than flat stages (239 W). Flat stages are characterized by a large variability of power output with short bursts of high power and long periods with reduced intensity of exercise, whereas mountain stages mostly require submaximal, constant power output over longer periods. 相似文献
63.
Dr. Claudia Pöhlmann Hans Anand Pant Jenny Frenzel Alexander Roppelt Olaf Köller 《Zeitschrift für Erziehungswissenschaft》2014,17(1):113-133
The introduction of educational standards in Germany forced teachers to change their perspective in order to achieve competence-oriented teaching. The initial representative surveys throughout Germany indicated that a short time after the introduction of the educational standards, teachers in various school forms were still very slow to implement the idea of competence-oriented teaching in their everyday school life. This article presents the effects of a newly developed intervention programme in which mathematics teachers familiarised themselves with educational standards for the first time. The teacher data and the performance data of the pupils of the schools participating in the project are compared in a longitudinal study with the data of schools which were not included in the intervention programme. The results indicate that after the intervention programme has run for one year, mathematics teachers in the project schools are more competence-oriented in their teaching and reflect more intensively on the concept of the educational standards than mathematics teachers in the comparison schools. 相似文献
64.
Tobias Linberg Olaf Struck Thomas Bäumer 《Zeitschrift für Erziehungswissenschaft》2018,21(6):1205-1227
Politicians and scientists are pinning their hopes on the expansion of the provision of all-day school, assuming that these programs provide particularly favorable conditions for supporting students’ cognitive skills. Against this background, this paper examines whether and under what conditions participation in all-day schooling is connected with the development of competencies in the domains of reading and mathematics. Using data from Starting Cohort 3 of the German National Educational Panel Study (NEPS), our research considers different forms of all-day schools, the usage of extracurricular learning activities, as well as student ratings of the attractiveness of extracurricular activities. Furthermore, selective access to different school types and usage of extracurricular activities is carefully controlled for. The results show a positive association between student-rated attractiveness of extracurricular activities and competence development. Neither the organization of schooling nor participation in learning activities show significant independent main effects on competence development from grade five to seven. 相似文献
65.
Olaf Ueberschär Axel Schleichardt Laura Buchhop Ina Fichtner Thomas Moeller 《Sports Engineering》2018,21(4):379-388
To quantify swimwear-induced differences under triathlon-specific conditions, we compare the swimming performance, the metabolic cost, and the standardised passive drag of well-trained triathletes when wearing (1) five speedsuit models by different manufacturers from 2017, (2) usual swimming trunks/swimsuits (men/women), and (3) individually preferred competition trisuits. Because of the complexity of the underlying hydrodynamic and biomechanical effects, three separate experimental stages were realized, each with 6–12 well-trained short- and middle-distance triathletes (male and female, mean age 22?±?5 years) from the German national elite or junior elite level. All measurements were conducted on the basis of real athletes’ motion in the water to correctly account for all relevant effects, including skin and muscle vibrations. First, the athletes took part in a series of 100 m short-distance tests at maximal effort in a long-course pool to quantify swim-time differences in absolute terms. Second, the subjects completed multiple submaximal 400 m tests at 95% of their individual maximal speed in a swimming flume, with their swimwear-related differences in metabolic load being explored in terms of blood lactate and heart rate. Third, the passive drag of the triathletes was measured in the flume during a towing test under standardised conditions in velocity steps of 0.2 m/s within the triathlon-relevant range of 1.1–1.7 m/s. In all three test stages, the speedsuits exhibited performance advantages over trunks/swimsuits: in the 100 m maximal test, the mean swim time with speedsuits decreased by 0.99?±?0.30 s (????1.5%). During the 400 m submaximal flume test, the mean heart rate showed a reduction of 7?±?2 bpm (? ??4.0%), while the post-exercise blood lactate accumulation decreased by 1.0?±?0.2 mmol/L (? ??26.2%). Similarly, the passive drag in the towing test was lowered by 3.2?±?1.0 W (????6.9% as for normalised power and ??5.2% as for normalised force) for the speedsuits. Wearing speedsuits instead of usual trunks/swimsuits is shown to improve the swimming performance and to reduce the metabolic cost for well-trained triathletes under triathlon-specific test conditions. The reduction in passive drag of the passively towed athlete’s body due specific speedsuit surface textures seems to be only one reason for performance advantages: the effective reduction in muscular, soft tissue, and skin vibrations at the trunk and thighs during active propulsive motion of the swimmer seems to further contribute substantially. 相似文献