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    IJERPH, Vol. 16, Pages 2765: Physical Activity as a Regulatory Variable between Adolescents’ Motivational Processes and Satisfaction with Life (2019)
    MDPI
    Details
    Publication Date: 2019
    Description: Framed within Self-Determination Theory, the objective of this study was to analyze the relationship between satisfaction and frustration of basic psychological needs, levels of motivation, physical activity, and satisfaction with life. Methods: A total of 487 students participated, comprising males (n = 262) and females (n = 225), aged between 14 and 16 years (M = 15.02; SD = 0.87), from different secondary schools. Results: A regression analysis was carried out (structural equation modeling) that revealed the existence of two theoretical lines, one positive and the other negative, where the satisfaction of basic psychological needs was positively related to autonomous motivation and physical activity, which predicted satisfaction with life. On the other hand, the frustration of basic psychological needs was positively related to controlled motivation, whereas controlled motivation (introjected regulation and extrinsic regulation) was inversely associated with physical activity and satisfaction with life. Conclusion: The results show the importance of motivational processes in physical activity, and the effects of physical activity on satisfaction with life in adolescents who spend more time engaged in physical activity.
    Print ISSN: 1661-7827
    Electronic ISSN: 1660-4601
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by MDPI
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  • 2
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    Sustainability, Vol. 11, Pages 1615: Emotional Intelligence and the Practice of Organized Physical-Sport Activity in Children (2019)
    MDPI
    Details
    Publication Date: 2019
    Description: Aim: Taking into account Bar-On’s postulations about social-emotional intelligence, the aim of the current work is to find out the differences in the five dimensions of this intelligence between children that practice organized sport and those children that do not practice it at the elementary school level. Method: A randomly selected sample of 940 children from elementary schools, ranging in age from 6 to 12 years old, attending different schools from the Autonomous Community of Extremadura (Spain), was used. Results: The results showed that children who practiced organized sport had better abilities at the intrapersonal and interpersonal level, better adaptability and mood states, and greater emotional intelligence than those who did not. The findings regarding gender and age indicated greater values in girls of emotional intelligence, highlighting the interpersonal dimension, as well as mood state scores, whereas younger children showed greater intrapersonal intelligence and less stress management. Moreover, children who practiced for three or more hours per day had a greater ability to cope with stress than those children who practiced for fewer hours a day. Conclusions: To conclude, it is important to promote federative sport practice in elementary education in order to ensure that children learn to better regulate and manage their emotions.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI
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  • 3
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    Sensors, Vol. 18, Pages 4066: Evaluation of Strategies for the Development of Efficient Code for Raspberry Pi Devices (2018)
    MDPI
    In: Sensors
    Details
    Publication Date: 2018
    Description: The Internet of Things (IoT) is faced with challenges that require green solutions and energy-efficient paradigms. Architectures (such as ARM) have evolved significantly in recent years, with improvements to processor efficiency, essential for always-on devices, as a focal point. However, as far as software is concerned, few approaches analyse the advantages of writing efficient code when programming IoT devices. Therefore, this proposal aims to improve source code optimization to achieve better execution times. In addition, the importance of various techniques for writing efficient code for Raspberry Pi devices is analysed, with the objective of increasing execution speed. A complete set of tests have been developed exclusively for analysing and measuring the improvements achieved when applying each of these techniques. This will raise awareness of the significant impact the recommended techniques can have.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI
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  • 4
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    Sustainability, Vol. 11, Pages 4606: The Contribution of Global Alliances to Airlines’ Environmental Performance (2019)
    MDPI
    Details
    Publication Date: 2019
    Description: Global alliances have traditionally been related to improvements in the economic and operational performances of companies, particularly in the airline industry. However, we still do not know the effect of the participation in this kind of multilateral agreement on the environmental performance of airlines. The main aim of this work is to analyze whether the alliance membership of airlines has an effect upon their environmental performance, and if so, whether or not the characteristics of the global alliance, as well as the business model of the airline, may influence this relation to a greater or lesser extent. The results of regression and Analysis of Variance (ANOVA) in a sample of 252 airlines (58 included in one of the three global alliances: Star Alliance, Oneworld, and SkyTeam) show a strong and inverse relationship between environmental performance and belonging to an alliance. The paper also shows empirical evidence of the influence of the business model of the airline on environmental performance. These results suggest important implications for managers facing challenges regarding sustainability.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI
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  • 5
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    Remote Sensing, Vol. 11, Pages 2365: Geometric Characterization of Vines from 3D Point Clouds Obtained with Laser Scanner Systems (2019)
    MDPI
    Details
    Publication Date: 2019
    Description: The 3D digital characterization of vegetation is a growing practice in the agronomy sector. Precision agriculture is sustained, among other methods, by variables that remote sensing techniques can digitize. At present, laser scanners make it possible to digitize three-dimensional crop geometry in the form of point clouds. In this work, we developed several methods for calculating the volume of vine wood, with the final intention of using these values as indicators of vegetative vigor on a thematic map. For this, we used a static terrestrial laser scanner (TLS), a mobile scanning system (MMS), and six algorithms that were implemented and adapted to the data captured and to the proposed objective. The results show that, with TLS equipment and the algorithm called convex hull cluster, the volumes of a vine trunk can be obtained with a relative error lower than 7%. Although the accuracy and detail of the cloud obtained with TLS are very high, the cost per unit for the scanned area limits the application of this system for large areas. In contrast to the inoperability of the TLS in large areas of terrain, the MMS and the algorithm based on the L1-medial skeleton and the modelling of cylinders of a certain height and diameter have solved the estimation of volumes with a relative error better than 3%. To conclude, the vigor map elaborated represents the estimated volume of each vine by this method.
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by MDPI
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