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KAJ SJÖHOLM 《课程研究杂志》2013,45(6):685-696
In Finland, English is widely visible outside the school context, above all in the area of entertainment and mass media, and is no longer regarded as a foreign language in the old sense of the word. Among Swedish‐minority students in Finland, the dominant status of English in various mass media leads to positive attitudes towards English among students and provides strong motivation to acquire the language. This paper considers whether the incidental learning of English taking place outside the classroom results in the same kind of proficiency as that resulting from formal classroom learning. 相似文献
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Many innovative item formats have been proposed over the past decade, but little empirical research has been conducted on their measurement properties. This study examines the reliability, efficiency, and construct validity of two innovative item formats—the figural response (FR) and constructed response (CR) formats used in a K–12 computerized science test. The item response theory (IRT) information function and confirmatory factor analysis (CFA) were employed to address the research questions. It was found that the FR items were similar to the multiple-choice (MC) items in providing information and efficiency, whereas the CR items provided noticeably more information than the MC items but tended to provide less information per minute. The CFA suggested that the innovative formats and the MC format measure similar constructs. Innovations in computerized item formats are reviewed, and the merits as well as challenges of implementing the innovative formats are discussed. 相似文献
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In this study, we examined whether a preparatory perceptual ‘anchoring’ technique would enhance the reproducibility (test–retest reliability) of adolescent children in their ability to self-regulate their exercise output on the basis of their effort perceptions. Forty-one adolescents aged 12.6±0.7 years (mean±s), randomly assigned to either an anchor or non-anchor group, undertook two identical production trials (three 3-min cycle ergometer bouts at levels 3, 6 and 8 of the Children's Effort Rating Table) over 8 days. Before each trial, the anchor group received an experiential (exercise) trial intended to provide a frame of reference for their perceived exertions. The test–retest reproducibility of the heart rates and power outputs produced during the production trials was assessed using intraclass correlation coefficients and 95% limits of agreement analysis. For the anchor group, the intraclass correlation coefficients ranged from 0.68 to 0.81 for heart rate and from 0.39 to 0.86 for power output. For the non-anchor group, they were generally higher: 0.86 to 0.93 and 0.81 to 0.95 for heart rate and power output, respectively. The 95% limits of agreement indicated no marked differences between the two groups in the amount of bias and within-subject error. The results suggest that among these adolescents, the implementation of an experiential anchoring protocol had no positive effect on the reproducibility of their exercise regulation during prescribed cycling. 相似文献
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Fluid and electrolyte balance in elite male football (soccer) players training in a cool environment
There are few data in the published literature on sweat loss and drinking behaviour in athletes training in a cool environment. Sweat loss and fluid intake were measured in 17 first-team members of an elite soccer team training for 90 min in a cool (5°C, 81% relative humidity) environment. Sweat loss was assessed from the change in body mass after correction for the volume of fluid consumed. Sweat electrolyte content was measured from absorbent patches applied at four skin sites. Mean (?± s) sweat loss during training was 1.69?±?0.45 l (range 1.06?-?2.65 l). Mean fluid intake during training was 423?±?215 ml (44?-?951 ml). There was no apparent relationship between the amount of sweat lost and the volume of fluid consumed during training (r 2 = 0.013, P = 0.665). Mean sweat sodium concentration was 42.5?±?13.0 mmol?·?l?1 and mean sweat potassium concentration was 4.2?±?1.0 mmol?·?l?1. Total salt (NaCl) loss during training was 4.3?±?1.8 g. The sweat loss data are similar to those recorded in elite players undergoing a similar training session in warm environments, but the volume of fluid ingested is less. 相似文献
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This paper presents a qualitative investigation of the work–family support roles of a sample of 29 child care providers serving low-income families in the Chicago area (16 family, friend, and neighbor providers (FFN), 7 licensed family child care providers (FCC), and 6 center-based teachers). Providers report offering low-income parents substantial logistical (flexible hours, help with routines) and economic help (flexible fees, help with subsidies) managing work and family, in addition to their care of children. For FFN providers, support was often provided in the context of significant stress and burden. FCC providers and center-based teachers were often constrained in their help-giving by ambivalence regarding professional guidelines and institutional constraints. Findings from this study may inform future research on the effects of child care on children and parents, and models of child care quality. 相似文献
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Social support interventions that incorporate professionally mediated peer support (PMPS) for improved breastfeeding outcomes were compared with no special breastfeeding support. Fifty-five breastfeeding mothers participated. The breastfeeding outcomes of duration, completeness, satisfaction, and exclusive breastfeeding were compared at 6 weeks postpartum among an experimental group that received PMPS, and among younger community (YC) and older community (OC) groups that received no special breastfeeding support. The PMPS group exclusively breastfed for a significantly longer duration than the YC group. At 6 weeks, mothers in both community groups who had weaned were significantly less satisfied with their breastfeeding experiences than the mothers who were still nursing their babies. Professionally mediated peer support can improve the early breastfeeding outcomes of duration of exclusive breastfeeding and satisfaction with breastfeeding. 相似文献
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SJ Grant G Oommen G McColl J Taylor L Watkins N Friel 《Journal of sports sciences》2013,31(12):1009-1015
Different methods of ball carrying can be used when a player runs with the ball in rugby union. We examined how three methods of ball carrying influenced sprinting speed: using both hands, under the left arm and under the right arm. These methods were compared with running without the ball. Our aim was to determine which method of ball carrying optimizes sprinting speed. Altogether, 48 rugby union players (age 21±2 years, height 1.83±0.1?m, body mass 85.3±12?kg, body fat 14?±?5%; mean±s) were recruited. The players performed twelve 30-m sprints in total (each player performed three trials under each of three methods of carrying the ball and sprinting without the ball). The design of the study was a form of Latin rectangle, balanced across the trial order for each of the methods and for pairwise combinations of the methods in blocks of four per trial. Each sprint consisted of a 10-m rolling start, followed by a 20-m timed section using electronic timing gates. Compared with sprinting 20?m without the ball (2.58±0.16?s), using both hands (2.62±0.16?s) led to a significantly slower time (P?<0.05). Sprinting 20?m with the ball under the left arm (2.61±0.15?s) or under the right arm (2.60± 0.17?s) was significantly quicker than when using ‘both hands’ (P?<0.05), and both these methods were significantly slower than when running without the ball (P?<0.05). Accordingly, running with the ball in both hands led to the greatest decrement in sprinting performance, although carrying the ball under one arm also reduced the players' sprinting ability. Our results indicate that to gain a speed advantage players should carry the ball under one arm. 相似文献
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