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排序方式: 共有96条查询结果,搜索用时 15 毫秒
81.
Juliano Fernandes-da-Silva Carlo Castagna Anderson Santiago Teixeira Lorival José Carminatti Luiz Guilherme Antonacci Guglielmo 《Journal of sports sciences》2016,34(24):2238-2245
ABSTRACTThe aim of this study was to examine the relationship between the peak velocity derived from the Carminatti Test (T-CAR) (PVT-CAR) and physical match performance in young soccer players. Thirty-three youth soccer players were recruited from 2 non-professional clubs. Friendly matches and small-sided game were performed. Physical match demands were assessed using Global Positioning System (GPS) technology. On a separate occasion, the players were submitted to the T-CAR. Players were categorised into 3 groups based on their T-CAR performance: Low (PVT-CAR ≤ P33), Intermediate (P33 > PVT-CAR < P66) and High (PVT-CAR ≥ P66). The PVT-CAR (15.5 ± 0.7 km·h?1) was significantly related to high-intensity activities (HIA; r = 0.78, P < 0.001), high-intensity running (HIR; r = 0.66, P < 0.001), sprinting (r = 0.62, P < 0.001) and total distance (TD) covered (r = 0.47, P < 0.01) during friendly matches. The PVT-CAR was strongly correlated with the amount of HIA (r = 0.81, P < 0.001), HIR (r = 0.85, P < 0.001) and TD covered (r = 0.81, P < 0.001) during small-sided game. No significant correlation was observed between the PVT-CAR and distance of sprinting (r = 0.49, P = 0.067) during small-side game. Furthermore, players in the High group covered significantly more TD (10%) and did more HIA (42%), sprinting (31%) and HIR (25%) during friendly matches compared to the players classified as having Low performance on the T-CAR. These differences still remained after adjusting for chronological age (CA), maturity and body size. In conclusion, the current study gives empirical support to the ecological and construct validity of this novel field test (T-CAR) as an indicator of match-related physical performance in young soccer players during pubertal years. 相似文献
82.
This paper reports on the results of an embedded, multiple case study that investigated the views of both lecturers and students on written staff-student feedback in three postgraduate programmes at one UK university. The study sought to uncover how ‘quality written feedback’ is perceived in the higher education environment under investigation. It found that tutors and students were broadly aligned in the features that they identified as constituting quality, which could be categorised within three dimensions: the affective or interpersonal, the orientational and the transformational. The findings suggest that feedback needs to incorporate each of these dimensions if it is to be perceived as being of good quality. 相似文献
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85.
Hugo Santiago Sanchez Katie Dunworth 《Assessment & Evaluation in Higher Education》2015,40(3):456-470
This paper examines the issues which postgraduate students and tutors experienced as they engaged in receiving, providing and requesting feedback, as well as the strategies which they adopted as they sought resolution of these issues. The study employed a case study approach, using data obtained from semi-structured and stimulated recall interviews with students and staff from three discipline areas at one university in the UK. The findings reinforce the conclusions that have been drawn in a number of previous studies in terms of the sources of dissatisfaction emerging from individual interactions and institutional practices. Additionally, however, the results expand on our current understanding of feedback and agency in higher education by illustrating how participants sought out imaginative solutions to the challenges they experienced, in order to enhance the effectiveness of the feedback process. The diversity of the strategies used provides evidence of student and tutor agency, and has implications for current feedback practices and future research in this area. 相似文献
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87.
Santiago Molina García 《Infancia y Aprendizaje》2013,36(5):44-53
RESUMENEl objetivo de esta investigación ha sido evaluar la batería de Inizan y comprobar su validez predictiva con muestras de niños españoles. Los sujetos fueron niños entre 5 y 6 años con un CI normal y sin trastornos emocionales. A la vista de los resultados se concluye que, pese a ser un buen instrumento, el valor predictivo de la batería puede ser mejorada sustituyendo algunos tests. No se debe considerar a esta batería infalible en cuanto a su valor de pronóstico, tiene algunos márgenes de error importantes. Se concluye, además, que en el aprendizaje de la lectura influyen algunos factores no contemplados por Inizan y que no se le da la suficiente importancia a otros aspectos, como los neuropsicológicos. 相似文献
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89.
Paula María Carmona-Quiroga Sagrario Martínez-Ramírez Santiago Sánchez-Cortés Mohamed Oujja Marta Castillejo María Teresa Blanco-Varela 《Journal of Cultural Heritage》2010,11(3):297-303
The elimination of spray paint using traditional (chemical and mechanical) methods inevitably entails altering surface characteristics. Hence, the impact and deterioration caused by graffiti in heritage buildings and monuments have led to the development and application of preventive systems in the form of antigraffiti coatings (which prevent paint from seeping into the pores of the surface material and facilitate cleaning). The effectiveness of two of these treatments, a commercial product (fluoroalkyl siloxane, protectosil, marketed by Degussa) and a hybrid organic-inorganic material (Ormosil), was evaluated in five construction materials (limestone, granite, cement mortar, lime mortar and brick), in terms of their penetration into the substrate. A number of techniques were used to determine the penetration depth (SEM/EDX, micro-Raman and LIBS), because a comparative analysis showed that none was universally valid for all types of treatments. The results show that the presence of the coating on the surface of less porous materials only ensures effective cleaning when the surface is fairly smooth. In granite, for instance, the CF3 terminals in the fluorinated treatment hinder spray paint bonding more effectively than Ormosil, but not efficiently enough to ensure complete removal of the paint from granite surfaces. 相似文献
90.
Enrique Jacoby Santiago Cueto Ernesto Pollitt 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1999,20(4):27-43
In the rural Andes of Peru, primary school inefficiency ranks higher than in the rest of the country, with a nearly 50 per cent rate of first grade repetition. In 1993 the investigators administered a battery of four psycho-educational tests to 360 schoolchildren in the fourth and fifth grades at ten primary schools in the Andean region of Huaraz. They also recorded the children''s individual characteristics, i.e. family background, nutritional status, and educational attainment, and rated the schools according to educational features such as classroom size, time devoted to learning, and student-teacher ratio. A year later, in 1994, children were re-examined in the schools using the same test battery. All subjects were small for their age, had poor diets, spoke mostly Quechua at home (Spanish in school), lived in a rural environment, and walked considerable distances to school. Regression analyses of the 1993 data indicated that the performance of Quechua children on verbal tests was heavily influenced by family background, while their mathematical competence was related to school experience. On the other hand, improvement in test scores from one year to the next appeared to be strongly related to test performance in 1993 and less clearly to the other recorded variables. Finally, the schools'' promotion rates were clearly associated with test scores from the previous year but less clearly with grade repetition rates. 相似文献