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Communities in RUIdeRA
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Recent Submissions
Item
Closing the loop through eco-innovation by European firms:
(Wiley, 2022) Triguero Cano, Ángela; Cuerva Narro, María del Carmen; Sáez Martínez, Francisco José
The purpose of this paper is to analyze the factors influencing the adoption of environmental innovations towards a circular economy (CE) by the EU firms, with special focus on technological capabilities and external support. A multivariate probit model is specified to allow the distinction between three types of eco-innovative practices: Reduce, Recycle, and Redesign technological processes. Using a novel taxonomy based upon the distinction between narrowing, closing, and slowing loops in the use of resources, we find that financial and technological capabilities are essential drivers for all types of CE actions in the European firms.
Item
4-(2-Hydroxyphenyl) imidazolium salts as organocatalysts for cycloaddition of isocyanates and epoxides to yield oxazolidin-2-ones
(Wiley, 2022) Caballero, María P.; Carrascosa, Fernando; Cruz Martínez, Felipe; Castro Osma, José A.; Rodríguez, Ana M.; North, Michael; Lara Sánchez, Agustín; Tejeda Sojo, Juan
Novel salts based on 1,3-dibutyl-4-(2-hydroxyphenyl)-1H-imidazolium bromide or iodide have been developed as bifunctional organocatalysts for the cycloaddition reaction of epoxides and isocyanates to form 3,4- and 3,5-disubstituted oxazolidin-2-ones. The molecular structure of these compounds was determined spectroscopically and confirmed by X-ray diffraction analysis.
Publication
Health-based physical education in an elementary school: effects on physical self-concept, motivation, fitness and physical activity
(Routledge Journals, Taylor & Francis LTD, 2024) Fernández Bustos, Juan Gregorio; Cuesta Valera, Pablo; Zamorano García, David; Simón Piqueras, Juan Ángel
Background: Promoting and developing health in Physical Education should not be limited to seeking to meet recommendations for physical activity and to increase motor competence or physical fitness, but should provide students with the motivation, confidence and knowledge required for them to be active for life. The Health-based Physical Education model (HbPE) is one of the most interesting models for health development. It takes a holistic perspective of health that is compatible with the salutogenic approach, where promoting and appreciating an active life is a core element (Haerens et al. 2011).
Purpose: The aim of this study was to examine the effects of a Health-based Physical Education programme on health-related factors (physical fitness and moderate-to-vigorous physical activity), emotional well-being (self-esteem and physical self-concept), and motivational factors (intention to be physically active and the degree of self-determination during practice).
Methods: A quasi-experimental design with pre- and post-test measures was applied to a sample composed of 131 schoolchildren aged 10 to 12 years (M = 10.87 ± 0.69) belonging to six randomly assigned class groups: three to the experimental group (n = 67) and three to the control group (n = 64). The experimental group participated in an intervention programme based on the HbPE model linked to a set of strategies to promote commitment, motivation and participation, while the control group completed a traditional programme for physical fitness improvement. As measures, we used Polar® HR monitors, the ALPHA-Fitness battery, the Motivation in Physical Education Questionnaire in Primary Education, the Intention to Be Physically Active Scale and the Pictorial Scale of Physical Self-Concept for Younger Children.
Findings: The experimental group showed higher levels of moderate-to-vigorous physical activity and a significant increase in physical fitness, including a reduction in BMI. Moreover, this group presented improvements in socio-emotional self-esteem, intrinsic motivation and the intention to be physically active. Nevertheless, against our hypothesis, quantitative analyses indicated no differences in physical self-concept.
Conclusion: These results support the use of HbPE as a model for designing and implementing health-promoting programmes that are compatible with a salutogenic approach. Apart from increasing physical activity and improving physical fitness, such programmes would provide knowledge and attitudes to foster practice beyond school.
Publication
Influence of natural aggregates typology on recycled concrete strength
(Elsevier, 2016) Laserna Arcas, Santiago Eduardo; Montero Martínez, Jesús
This paper reports a study on recycled aggregates concrete to analyze the influence of using two different types of natural aggregates, river aggregates and crushed aggregates, on the strength properties of recycled aggregates concrete. A total of twenty different mixes were analyzed with an effective water/cement ratio of 0.5 and cement contents of 260?300?340 kg/m3 for recycled rates of coarse aggregates of 0?20?50?100%. The results show that the strength property depends of the type of natural aggregate used and of the recycled replacement ratio. An increment of 15% on compressive strength was obtained for river natural aggregates and 100% recycled replacement ratio, while a decrease of approximately 10?25% was observed for mixtures with crushed natural aggregates performed under similar manufacturing conditions.
Publication
Influence of Effective Mixing Water in Recycled Concrete
(Elsevier, 2017) Laserna Arcas, Santiago Eduardo; Montero Martínez, Jesús
This study analyzes the influence of two different modes for estimating the volume of mixing water (total water and effective water) on the dosing and behavior of recycled aggregate concrete. Different concrete mixtures of conventional and recycled concrete are analyzed to determine the relationship between slump and compressive strength according to the total and effective water/cement ratios. Furthermore, to avoid the pre-saturation of recycled aggregates, an improved mixing methodology for manufacturing of recycled concrete based on the best characteristics of two-stage mixing methods as well as on the water absorption speed is recommended. The results suggest that recycled concrete requires a minimal time to achieve an adequate mix and demonstrate that an increase in total water in recycled concrete does not result in strength reduction when the mixtures were dosed with the same volume of effective water. Furthermore, these results conflict with the recommendation to increase the cement content due to the extra volume of water needed for the recycled mix to maintain the slump and a constant water/cement ratio.