Dragons,Ladybugs, and Softballs: Girls’ STEM Engagement with Human-Centered Robotics     

Gomoll  Andrea  Hmelo-Silver  Cindy E.  Šabanović  Selma  Francisco  Matthew 《Journal of Science Education and Technology》2016,25(6):899-914

Journal of Science Education and Technology - Early experiences in science, technology, engineering, and math (STEM) are important for getting youth interested in STEM fields, particularly for...  相似文献   

Social interaction learning strategies,motivation, first-year students’ experiences and permanence in university studies*     

Rafael García-Ros  Francisco Pérez-González  Francisco Cavas-Martínez  José M. Tomás 《教育心理学》2018,38(4):451-469

Applying a structural equations modelling methodology, the study analyses the relationships and effects of self-regulated learning (social interaction learning strategies and motivation) and first-year university experiences on permanence in the sophomore year. The participants are 239 first-year students in different Engineering degrees at a public university in south-eastern Spain. Two alternative structural models are evaluated, showing the superiority of the model where first-year university experiences completely mediate the effects of self-regulated learning on permanence. Motivation and social interaction learning strategies show direct effects on first-year university experiences, and first-year university experiences, in turn, show direct effects on permanence; additionally, both motivation and social interaction learning strategies have indirect effects on permanence via first-year university experiences. The noteworthy theoretical implications of the results are discussed, as well as the teaching methodology and support services provided to first-year university students.  相似文献   

A telepresence learning environment for opera singing: distance lessons implementations over Internet2     

Francisco Alpiste Penalba  Teresa Rojas-Rajs  Pedro Lorente  Francisco Iglesias  Joaquín Fernández  Josep Monguet 《Interactive Learning Environments》2013,21(5):438-455

The Opera eLearning project developed a solution for opera singing distance lessons at the graduate level, using high bandwidth to deliver a quality audio and video experience that has been evaluated by singing teachers, chorus and orchestra directors, singers and other professional musicians. Prior to finding a technological model that suits the user's requirements, several experiments have been conducted, testing and prototyping different technologies, until arriving at a telepresence, immersive sound model. This paper summarises the findings of this pilot stage, and its interest includes the management of innovation exercises across a multidisciplinary team, based on usability and a user-centred design. Some of the technology tested includes professional audio and video equipment, software for A/V signal capturing and transmission on uncompressed formats, A/D converters, and other auxiliary devices. The resultant model has later been successfully used in a formal case study, delivering 14 remote masterclasses.  相似文献   

New Method for Historic Rammed-earth Wall Characterization: The Almohade Ramparts of Malaga and Seville     

Juan Jesús Martín-del-Rio  Vicente Flores-Alés  Francisco Javier Alejandre-Sánchez  Fco. Javier Blasco-López 《文物保护研究》2013,58(6):363-372

ABSTRACT

The goal of this research is to propose a new method of characterizing rammed-earth walls. Based on their historic building materials properties, five broad test groups were established for the characterization: chemical and mineralogical composition, physical properties, mechanical properties, particle size distribution, and dating. These determinations can, in turn, be grouped into two different types: instrumental techniques such as XRF, XRD, and SEM-EDX, as well as adaptations of standard methods (mainly UNE-EN standards) for application to these materials. As case studies where the proposed method is applied, we present our research on the rammed-earth walls in the ramparts of Seville and Malaga (Spain), clearly showing the method’s capacity for comparing and differentiating different rammed-earth walls.  相似文献   

Porosity and surface hardness as indicators of the state of conservation of Mudéjar plasterwork in the Real Alcázar in Seville     

Francisco Javier Blasco-López  Francisco Javier Alejandre Sánchez 《Journal of Cultural Heritage》2013,14(2):169-173

Plasterwork, a very typical element of Islamic art, comprises highly artistic decorative elements on wall, arches, and vaults. Due to their gypsum composition, such elements are easily weathered, primarily because of low mechanical strength and slight solubility in water. This work has studied the traditional Islamic plasterwork in the halls and patios of the Mudéjar Palace (13–16th centuries) in the Real Alcázar of Seville. This palace complex was declared a World Heritage Site by UNESCO in 1987. The analysis of its porosity and shore C surface hardness has allowed determination of the mathematical correlation between them. Consequently, future evaluations can merely measure the hardness (a non-destructive test) to estimate the plasterwork's porosity (which reveals its mechanical strength and its degree of weathering). These elements must be maintained in order to prevent the spread of pathologies. In addition to requiring an in-depth knowledge of its materials, application techniques, and properties, to do so also demands simple techniques for regular assessments and criteria to prioritize interventions if they become necessary.  相似文献   

Seasonal variation in physical activity and sedentary time in different European regions. The HELENA study     

Luis Gracia-Marco  Francisco B. Ortega  Jonatan R. Ruiz  Craig A. Williams  Maria HagstrÖmer  Yannis Manios 《Journal of sports sciences》2013,31(16):1831-1840

Abstract

This report aims (1) to examine the association between seasonality and physical activity (PA) and sedentary time in European adolescents and (2) to investigate whether this association was influenced by geographical location (Central-North versus South of Europe), which implies more or less extreme weather and daylight hours. Valid data on PA, sedentary time and seasonality were obtained in 2173 adolescents (1175 females; 12.5–17.5 years) included in this study. Physical activity and sedentary time were measured by accelerometers. ANCOVA was conducted to analyse the differences in PA and sedentary time across seasons. Results showed that girls had lower levels of moderate to vigorous PA (MVPA) and average PA, and spent more time in sedentary activities in winter compared with spring (all P < 0.05). Stratified analyses showed differences in PA and sedentary time between winter and spring in European girls from Central-North of Europe (P < 0.05 for sedentary time). There were no differences between PA and sedentary time across seasonality in boys. In conclusion, winter is related with less time spent in MVPA, lower average PA and higher time spent in sedentary activities in European adolescent girls, compared with spring. These differences seem to mainly occur in Central-North Europe.  相似文献   

Body fat measurement in elite sport climbers: Comparison of skinfold thickness equations with dual energy X-ray absorptiometry     

Vanesa España Romero  Jonatan R. Ruiz  Francisco B. Ortega  Enrique G. Artero  Germán Vicente-Rodríguez  Luis A. Moreno 《Journal of sports sciences》2013,31(5):469-477

Abstract

The aim of this study was to compare equations for estimating percentage body fat from skinfold thickness in elite sport climbers by assessing their agreement with percentage body fat measured using dual-energy X-ray absorptiometry (DXA). Skinfold thickness was measured in a convenience sample of 19 elite sport climbers [9 women and 10 men; mean age 31.2 years (s = 5.0) and 28.6 years (s = 3.6), respectively]. Percentage body fat was estimated using 17 different equations, and it was also measured by DXA. A significant inter-methods difference was observed for all equations, except for Durnin's equation in men (inter-methods difference: ?0.57% and ?0.29%; 1.96 s: 5.56 and 5.23 for Siri's and Brozek's equation, respectively) and women (inter-methods difference: ?0.67% and ?1.29% for Siri's and Brozek's equation, respectively), and for Wilmore's equation using Siri's body fat equation in women (inter-methods difference: ?1.86%). In women, the limits of agreement were lower when using Durnin's equation compared with Wilmore's equation (1.96 s: 3.86% and 5.13%, respectively). In conclusion, of the 17 studied equations, Durnin's equation was the most accurate in estimating percentage body fat in both male and female elite climbers. Therefore, Durnin's equation could be used to assess percentage body fat in elite sport climbers if more accurate methods are not available. The generalizability of the results is limited by the fact that the sample was not selected at random.  相似文献   

Relationship between physiological parameters and performance during a half-ironman triathlon in the heat     

Juan Del Coso  Cristina González  Javier Abian-Vicen  Juan José Salinero Martín  Lidon Soriano  Francisco Areces 《Journal of sports sciences》2013,31(18):1680-1687

Abstract

Triathlon is a popular outdoor endurance sport performed under a variety of environmental conditions. The aim of this study was to assess physiological variables before and after a half-ironman triathlon in the heat and to analyse their relationship with performance. Thirty-four well-trained triathletes completed a half-ironman triathlon in a mean dry temperature of 29 ± 3ºC. Before and within 1 min after the end of the race, body mass, core temperature, maximal jump height and venous blood samples were obtained. Mean race time was 315 ± 40 min, with swimming (11 ± 1%), cycling (49 ± 2%) and running (40 ± 3%) representing different amounts of the total race time. At the end of the competition, body mass changed by ?3.8 ± 1.6% and the change in body mass correlated positively with race time (r = 0.64; P < 0.001). Core temperature increased from 37.5 ± 0.6ºC to 38.8 ± 0.7ºC (P < 0.001) and post-race core temperature correlated negatively with race time (r = ?0.47; P = 0.007). Race time correlated positively with the decrease in jump height (r = 0.38; P = 0.043), post-race serum creatine kinase (r = 0.55; P = 0.001) and myoglobin concentrations (r = 0.39; P = 0.022). In a half-ironman triathlon in the heat, greater reductions in body mass and higher post-competition core temperatures were present in faster triathletes. In contrast, slower triathletes presented higher levels of muscle damage and decreased muscle performance.  相似文献   

Reliability of NIRS portable device for measuring intercostal muscles oxygenation during exercise     

Felipe Contreras-Briceño  Maximiliano Espinosa-Ramirez  Gonzalo Hevia  Diego Llambias  Miguel Carrasco  Francisco Cerda 《Journal of sports sciences》2013,31(23):2653-2659

ABSTRACT

This study assessed the intra-individual reliability of oxygen saturation in intercostal muscles (SmO₂-m.intercostales) during an incremental maximal treadmill exercise by using portable NIRS devices in a test-retest study. Fifteen marathon runners (age, 24.9 ± 2.0 years; body mass index, 21.6 ± 2.3 kg·m^?2; V?O₂-peak, 63.7 ± 5.9 mL·kg^?1·min^?1) were tested on two separate days, with a 7-day interval between the two measurements. Oxygen consumption (V?O₂) was assessed using the breath-by-breath method during the V?O₂-test, while SmO₂ was determined using a portable commercial device, based in the near-infrared spectroscopy (NIRS) principle. The minute ventilation (VE), respiratory rate (RR), and tidal volume (Vt) were also monitored during the cardiopulmonary exercise test. For the SmO₂-m.intercostales, the intraclass correlation coefficient (ICC) at rest, first (VT1) and second ventilatory (VT2) thresholds, and maximal stages were 0.90, 0.84, 0.92, and 0.93, respectively; the confidence intervals ranged from ?10.8% – +9.5% to ?15.3% – +12.5%. The reliability was good at low intensity (rest and VT1) and excellent at high intensity (VT2 and max). The Spearman correlation test revealed (p ≤ 0.001) an inverse association of SmO₂-m.intercostales with V?O₂ (ρ = ?0.64), VE (ρ = ?0.73), RR (ρ = ?0.70), and Vt (ρ = ?0.63). The relationship with the ventilatory variables showed that increased breathing effort during exercise could be registered adequately using a NIRS portable device.  相似文献   

Estimation of teacher practices based on text transcripts of teacher speech using a support vector machine algorithm     

Roberto Araya  Francisco Plana  Pablo Dartnell  Jorge Soto‐Andrade  Gina Luci  Elena Salinas  Marylen Araya 《British journal of educational technology : journal of the Council for Educational Technology》2012,43(6):837-846

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