167 research outputs found

    Influence of prevention law of occupational risks in work place accidents of a large company.

    Get PDF
    Se ha realizado un estudio retrospectivo de todos los accidentes de trabajo (AT) que han causado baja laboral de una empresa del sector industrial, cuya plantilla ha oscilado entre 665 y 327 trabajadores a lo largo del periodo de estudio (del 01-01-1983 hasta el 31-12-2015). El material estudiado han sido los 1.273 accidentes sucedidos en el periodo indicado. En cada AT, se ha considerado su etiología, laboral o de camino al trabajo, y la gravedad de las lesiones valorada en función del tiempo que ha precisado para su curación. La promulgación de la Ley 31/1995 y la abundante legislación aparecida en los años siguientes no supuso un cambio en la frecuencia ni en el tipo de AT. El cambio de cultura empresarial, que se basa en compartir la responsabilidad sobre seguridad con todos los empleados, sí ha generado un significativo cambio actitudinal que se ha traducido en una gran variación de la frecuencia de los AT y de su gravedad. El mero cumplimiento de la legislación no supone per se una mejora de la salud de los trabajadores si no va acompañado de una firme decisión empresarial que abarque a cada uno de los empleados.We performed a retrospective study of all accidents (WA) that have generated absence from work in an industrial company whose staff has ranged from 663 to 327 workers throughout the study period (from 01-01-1983 until 31-12-2015). The material studied was the 1273 accidents that occurred in the indicated period. Each etiology has been considered, workplace or “on the way to work,” and the severity of injuries assessed as a function of time that has been required for healing. The enactment of Law 31/1995 and the abundant legislation appeared in the following years, did not produce a change in the frequency or type of WA. The security responsibility, shared with all employees, has generated significant attitudinal change that has resulted in a wide variation in the frequency, severity and etiology of the AT. Only compliance with the legislation does not produce an improvement in the health of workers if it is accompanied by a sound business decision covering each employee.Medicin

    Diagnosis of a battery energy storage system based on principal component analysis

    Full text link
    [EN] This paper proposes the use of principal component analysis (PCA) for the state of health (SOH) diagnosis of a battery energy storage system (BESS) that is operating in a renewable energy laboratory located in Chocó, Colombia. The presented methodology allows the detection of false alarms during the operation of the BESS. The principal component analysis model is applied to a parameter set associated to the capacity, internal resistance and open circuit voltage of a battery energy storage system. The parameters are identified from experimental data collected daily. The PCA model retains the first 5 components that collect 80.25% of the total variability. During the test under real operation contidions, PCA diagnosed a degradation of state of health fastest than the comercial battery controller. A change in the charging modes lead to a battery recovery that was also monitored by the proposed algortihm, and control actions are proposed that lead the BESS to work in normal conditions.The authors would like to acknowledge the research project "Implementacion de un programa de desarrollo e investigacion de energias renovables en el departamento del Choco, BPIN 2013000100285 (in Spanish)" and the Universidad TecnolOgica del Choco (in Spanish). The authors would like to thank the anonymous reviewers as well as the editor for their valuable comments that have greatly improved the final version of the paper.Banguero-Palacios, E.; Correcher Salvador, A.; Pérez-Navarro Gómez, Á.; García Moreno, E.; Aristizabal, A. (2020). Diagnosis of a battery energy storage system based on principal component analysis. Renewable Energy. 146:2438-2449. https://doi.org/10.1016/j.renene.2019.08.064S24382449146Perera, A. T. D., Attalage, R. A., Perera, K. K. C. K., & Dassanayake, V. P. C. (2013). Designing standalone hybrid energy systems minimizing initial investment, life cycle cost and pollutant emission. Energy, 54, 220-230. doi:10.1016/j.energy.2013.03.028Krieger, E. M., Cannarella, J., & Arnold, C. B. (2013). A comparison of lead-acid and lithium-based battery behavior and capacity fade in off-grid renewable charging applications. Energy, 60, 492-500. doi:10.1016/j.energy.2013.08.029Aksakal, C., & Sisman, A. (2018). On the Compatibility of Electric Equivalent Circuit Models for Enhanced Flooded Lead Acid Batteries Based on Electrochemical Impedance Spectroscopy. Energies, 11(1), 118. doi:10.3390/en11010118Dhundhara, S., Verma, Y. P., & Williams, A. (2018). Techno-economic analysis of the lithium-ion and lead-acid battery in microgrid systems. Energy Conversion and Management, 177, 122-142. doi:10.1016/j.enconman.2018.09.030Li, X., Shu, X., Shen, J., Xiao, R., Yan, W., & Chen, Z. (2017). An On-Board Remaining Useful Life Estimation Algorithm for Lithium-Ion Batteries of Electric Vehicles. Energies, 10(5), 691. doi:10.3390/en10050691Ariza Chacón, H., Banguero, E., Correcher, A., Pérez-Navarro, Á., & Morant, F. (2018). Modelling, Parameter Identification, and Experimental Validation of a Lead Acid Battery Bank Using Evolutionary Algorithms. Energies, 11(9), 2361. doi:10.3390/en11092361Copetti, J. B., Lorenzo, E., & Chenlo, F. (1993). A general battery model for PV system simulation. Progress in Photovoltaics: Research and Applications, 1(4), 283-292. doi:10.1002/pip.4670010405Guasch, D., & Silvestre, S. (2003). Dynamic battery model for photovoltaic applications. Progress in Photovoltaics: Research and Applications, 11(3), 193-206. doi:10.1002/pip.480Blaifi, S., Moulahoum, S., Colak, I., & Merrouche, W. (2016). An enhanced dynamic model of battery using genetic algorithm suitable for photovoltaic applications. Applied Energy, 169, 888-898. doi:10.1016/j.apenergy.2016.02.062Blaifi, S., Moulahoum, S., Colak, I., & Merrouche, W. (2017). Monitoring and enhanced dynamic modeling of battery by genetic algorithm using LabVIEW applied in photovoltaic system. Electrical Engineering, 100(2), 1021-1038. doi:10.1007/s00202-017-0567-6Gao, Z., Cecati, C., & Ding, S. X. (2015). A Survey of Fault Diagnosis and Fault-Tolerant Techniques—Part I: Fault Diagnosis With Model-Based and Signal-Based Approaches. IEEE Transactions on Industrial Electronics, 62(6), 3757-3767. doi:10.1109/tie.2015.2417501Ferrer, A. (2007). Multivariate Statistical Process Control Based on Principal Component Analysis (MSPC-PCA): Some Reflections and a Case Study in an Autobody Assembly Process. Quality Engineering, 19(4), 311-325. doi:10.1080/08982110701621304Jiang, Q., Yan, X., & Zhao, W. (2013). Fault Detection and Diagnosis in Chemical Processes Using Sensitive Principal Component Analysis. Industrial & Engineering Chemistry Research, 52(4), 1635-1644. doi:10.1021/ie3017016Fan, J., & Wang, Y. (2014). Fault detection and diagnosis of non-linear non-Gaussian dynamic processes using kernel dynamic independent component analysis. Information Sciences, 259, 369-379. doi:10.1016/j.ins.2013.06.021Garcia-Alvarez, D., Fuente, M. J., & Sainz, G. I. (2012). Fault detection and isolation in transient states using principal component analysis. Journal of Process Control, 22(3), 551-563. doi:10.1016/j.jprocont.2012.01.007Banguero, E., Aristizábal, A. J., & Murillo, W. (2017). A Verification Study for Grid-Connected 20 kW Solar PV System Operating in Chocó, Colombia. Energy Procedia, 141, 96-101. doi:10.1016/j.egypro.2017.11.019Rahman, M. A., Anwar, S., & Izadian, A. (2016). Electrochemical model parameter identification of a lithium-ion battery using particle swarm optimization method. Journal of Power Sources, 307, 86-97. doi:10.1016/j.jpowsour.2015.12.083Yang, X., Chen, L., Xu, X., Wang, W., Xu, Q., Lin, Y., & Zhou, Z. (2017). Parameter Identification of Electrochemical Model for Vehicular Lithium-Ion Battery Based on Particle Swarm Optimization. Energies, 10(11), 1811. doi:10.3390/en10111811Kai, H., Yong-Fang, G., Zhi-Gang, L., Hsiung-Cheng, L., & Ling-Ling, L. (2018). Development of Accurate Lithium-Ion Battery Model Based on Adaptive Random Disturbance PSO Algorithm. Mathematical Problems in Engineering, 2018, 1-13. doi:10.1155/2018/3793492Venter, G., & Sobieszczanski-Sobieski, J. (2003). Particle Swarm Optimization. AIAA Journal, 41(8), 1583-1589. doi:10.2514/2.2111Layadi, T. M., Champenois, G., Mostefai, M., & Abbes, D. (2015). Lifetime estimation tool of lead–acid batteries for hybrid power sources design. Simulation Modelling Practice and Theory, 54, 36-48. doi:10.1016/j.simpat.2015.03.001Rahmani, M., & Atia, G. K. (2017). Coherence Pursuit: Fast, Simple, and Robust Principal Component Analysis. IEEE Transactions on Signal Processing, 65(23), 6260-6275. doi:10.1109/tsp.2017.2749215Bro, R., & Smilde, A. K. (2014). Principal component analysis. Anal. Methods, 6(9), 2812-2831. doi:10.1039/c3ay41907jGranato, D., Santos, J. S., Escher, G. B., Ferreira, B. L., & Maggio, R. M. (2018). Use of principal component analysis (PCA) and hierarchical cluster analysis (HCA) for multivariate association between bioactive compounds and functional properties in foods: A critical perspective. Trends in Food Science & Technology, 72, 83-90. doi:10.1016/j.tifs.2017.12.006Soh, W., Kim, H., & Yum, B.-J. (2015). Application of kernel principal component analysis to multi-characteristic parameter design problems. Annals of Operations Research, 263(1-2), 69-91. doi:10.1007/s10479-015-1889-2Deng, X., Tian, X., Chen, S., & Harris, C. J. (2018). Nonlinear Process Fault Diagnosis Based on Serial Principal Component Analysis. IEEE Transactions on Neural Networks and Learning Systems, 29(3), 560-572. doi:10.1109/tnnls.2016.2635111De Ketelaere, B., Hubert, M., & Schmitt, E. (2015). Overview of PCA-Based Statistical Process-Monitoring Methods for Time-Dependent, High-Dimensional Data. Journal of Quality Technology, 47(4), 318-335. doi:10.1080/00224065.2015.11918137Vanhatalo, E., Kulahci, M., & Bergquist, B. (2017). On the structure of dynamic principal component analysis used in statistical process monitoring. Chemometrics and Intelligent Laboratory Systems, 167, 1-11. doi:10.1016/j.chemolab.2017.05.016Zhao, C., Wang, F., Gao, F., Lu, N., & Jia, M. (2007). Adaptive Monitoring Method for Batch Processes Based on Phase Dissimilarity Updating with Limited Modeling Data. Industrial & Engineering Chemistry Research, 46(14), 4943-4953. doi:10.1021/ie061320fNomikos, P., & MacGregor, J. F. (1995). Multivariate SPC Charts for Monitoring Batch Processes. Technometrics, 37(1), 41-59. doi:10.1080/00401706.1995.10485888Design of Off-Grid Systems with Sunny Island 4.4M/6.0H/8.0H Devices. Version 2.3. SMA. 1-42. http://files.sma.de/dl/1353/Designing-OffGridSystem-PL-en-23.pdf [Accessed on 15.07.2018].Ungurean, L., Cârstoiu, G., Micea, M. V., & Groza, V. (2016). Battery state of health estimation: a structured review of models, methods and commercial devices. International Journal of Energy Research, 41(2), 151-181. doi:10.1002/er.359

    Energy sustainability evolution in the Mediterranean Countries and synergies from a global energy scenario for the area

    Full text link
    [EN] Energy supply is essential for the development of any society and search for energy sustainability is a must with poverty reduction and environmental sustainability as the two challenges to consider for any energy scenario. Meanwhile environmental damage receives predominant attention in the energy sustainability analysis, a lack of attention exists to others, such as external dependence for energy supply or availability of enough energy for people. However, these factors also compromise the sustainability of the assumed policies. An analysis considering these three factors has been developed and applied to countries in the Mediterranean area by considering two well-defined zones: the North side with an adequate level of energy consumption, but with excessive CO2 emissions and high external dependence on energy supply; and, by the contrary, the Middle East and North African countries, with a deficit in energy supply, but without problems in CO2 emissions and external energy supply. Results show a requirement of a 100% renewable scenario for the countries in the North area, while those in the MENA need to increase drastically their energy demand with a significant contribution from renewable sources. Assuming a global scenario for the entire area, energy sustainability could be reached with less demanding requirements.This work was partly supported in part by the Spanish Public Administration "Ministerio de Universidades" under the grant Margarita Salas-Universitat Politecnica de Valencia, funded by the European Union-Next Generation EU.Bastida-Molina, P.; Hurtado-Perez, E.; Moros Gómez, MC.; Cárcel-Carrasco, J.; Pérez-Navarro, Á. (2022). Energy sustainability evolution in the Mediterranean Countries and synergies from a global energy scenario for the area. Energy. 252:1-22. https://doi.org/10.1016/j.energy.2022.12406712225

    Estrategias europeas contra el discurso del odio

    Get PDF
    El objetivo es presentar un panorama global de las principales estrategias que se adoptan en Europa para frenar y contrarrestar los discursos de odio. Se realiza una reflexión crítica a partir de una selección de documentación oficial y literatura académica más relevantes. Se destacan, entre otras medidas, la necesidad de aplicar el marco jurídico común europeo y formar una ciberopinión pública mediante la educomunicación y la lucha contra la desinformación. Se concluye que las instituciones europeas deben desarrollar una estrategia común y global en la lucha contra el discurso del odio, que integre las intervenciones parciales en diversas áreas y las diferentes iniciativas nacionales

    Relationship Between Self-Perceived Health, Vitality, and Posttraumatic Growth in Liver Transplant Recipients

    Get PDF
    Our objective was to analyze the differences in posttraumatic growth in 240 liver transplant recipients based on two factors. First, self-perceived health: better (Group 1 = G1) and worse (Group 2 = G2). Second, vitality: more (Group 3 = G3) and less (Group 4 = G4). The Posttraumatic Growth Inventory, SF-36 Health Survey (Item 2) and SF-12 Health Survey (vitality dimension) were used. Firstly, analyzing main effects recipients with better (G1) compared to worse (G2) self-perceived health, showed greater posttraumatic growth. Interaction effects were found on essential posttraumatic growth domains such as new possibilities (p = 0.040), personal strength (p = 0.027), and appreciation of life (p = 0.014). Statistically significant differences showed that among transplant recipients with worse self-perceived health (G2), those with more vitality had higher levels on abovementioned posttraumatic growth dimensions. However, in transplant recipients with better self-perceived health (G1) respective dimensions were not significantly influenced by the level of vitality. Among the recipients with less vitality (G4), those with better self-perceived health showed higher scores on abovementioned posttraumatic growth dimensions. We conclude that positive self-perceived health might compensate for a lack of vitality as well as a high level of vitality may compensate for negative self-perceived health regarding the development of crucial aspects of posttraumatic growth after liver transplantation.Ministerio de Economía y Competitividad de España PSI2014-51950-

    Carcinoma ductal infiltrante de mama en el hombre. Presentación de un caso

    Get PDF
    El cáncer mamario en hombres es una enfermedad rara e infrecuente, de investigación limitada. El primer caso documentado fue descrito en Inglaterra en el siglo XIV por John Arderne. Los factores que predisponen al riesgo parecen incluir la exposición a la radiación, la administración de estrógenos y las enfermedades relacionadas con el hiperestrogenismo, como la cirrosis o el síndrome de Klinefelter. Se presenta un paciente masculino de 61 años de edad procedente de área urbana con antecedentes aparentes de salud que notó ulceración en el pezón con secreción que machaba la camisa. Se aplicó protocolo de diagnóstico de cáncer de mama y se diagnosticó carcinoma ductal infiltrante. Se realizó tratamiento quirúrgico y quimioterapia. En estos momentos presenta evolución favorable con enfermedad estable y tratamiento adyuvante con tamoxifeno por cinco años

    Design of an Improvement Cycle in the Classroom in Production and Audiovisual Enterprise II

    Get PDF
    En este capítulo se lleva a cabo un análisis detallado de los resultados del Ciclo de Mejora en el Aula (CIMA) implementado en la asignatura Producción y empresa audiovisual II, de 3º del Grado en comunicación audiovisual durante el primer cuatrimestre del curso 2021/2022. Se trata de un CIMA de dieciséis horas de duración, ocho sesiones de dos horas, aplicada a una asignatura que tiene como proyecto principal la realización de un cortometraje. Este CIMA es una ampliación del llevado a cabo durante el curso 2019/2020.This chapter, is a detailed analysis of the results carried out of the Teaching Improvement Cycle implemented in the subject Production and Audiovisual Enterprise II, of the 3rd course of Audiovisual Media degree in during the first semester of the 2021/2022 academic year. It is a sixteen-hour CMD, eight two-hour sessions, applied to a subject whose main project is the making of a short film. This CMD is an extension of the one carried out during the 2019/2020 academic year

    Application of a cycle of teaching improvement in the subject Theory, production and performance: Radio genres and creation of a fictional genre narrative.

    Get PDF
    La asignatura “Teoría, producción y realización de radio” se imparte en el segundo cuatrimestre del tercer curso del Grado en Comunicación Audiovisual y del Doble Grado en Periodismo y Comunicación Audiovisual (Universidad de Sevilla). Es una asignatura de carácter optativo, en la que los alumnos, para superar la evaluación, deben realizar un programa de radio ficcional a partir de grabaciones propias, la realización de un magazine en directo y un examen de evaluación para calificar los conocimientos teóricos de la asignatura. Un sistema de evaluación continua ya que el docente revisa cada uno de los pasos de los alumnos durante el proceso creativo de la producción radiofónica en ambos ejercicios. A causa de las medidas impuestas durante el Estado de alarma el sistema de evaluación se reajusta, en un momento de transición de las clases presenciales al online, y se mantiene el primer trabajo y un análisis teórico de un fragmento de un programa de radio. Posiblemente en este último ejercicio puedan volcar de manera mucho más satisfactoria su conocimiento sobre el material teórico impartido en la asignatura

    Effects of two exercise programmes on joint position sense, dynamic balance and countermovement jump in male amateur football players. A randomised controlled trial.

    Get PDF
    Introduction: The injury prevention and warm-up exercises programmes improve physical performance and injury ratio, but it is poorly investigated in amateur football. Objectives: To assess the effects of two warm-up multi-station programmes (IAI-Programme and FIFA11+) through JPS, LSDT and CMJ. Study design: Randomised controlled trial. Methods: 36 football players were randomised into 2 groups: IAI-Programme (n = 18) and FIFA11+ (n = 18) and performed the intervention protocol for 6 weeks. JPS, LSDT and CMJ were measured at baseline, after 6, 10 and 18 weeks (from baseline). The inter-group and intra-group differences were assessed by repeated-measures analysis of variance test (ANOVA). Results: Significant differences between groups were found after 18 weeks in the absolute angular error (-2.18[-4.33,-0.047], d = 0.69, p < 0.05) of the JPS and in the CMJ (p = 0.001, ?2p=,0.298) in favour of IAI-Programme when compared to FIFA11 +. No significant differences between groups were found in the LSDT. There were also intra-group differences observed in the LSDT in both groups. Conclusions: IAI-Programme can provide sensitive benefits with respect to the proprioceptive ability of knee flexion and CMJ than FIFA11 +. Both IAI-Programme and FIFA11+ present improvements in the dynamic postural control measured by the LSDT

    Coping strategies in liver transplant recipients and caregivers according to patient posttraumatic growth

    Get PDF
    The purpose of this study was to analyze the differences in coping strategies employed by liver transplant recipients and their family members according to patient posttraumatic growth. Two matched groups of 214 liver transplant recipients and 214 family members were selected. The Posttraumatic Growth Inventory and Brief COPE were used. The most relevant results were: (1) Interactive effects in active coping, support (instrumental and emotional) and acceptance strategies, which were all used more by patients with higher growth levels, while their family members showed no differences in use of these strategies by patient growth level. Furthermore, while a low level of patient growth did not mark differences between them and their caregivers, a high level did, patients employing more active coping and support (instrumental and emotional), (2) In both groups a high level of patient growth was associated with more use of positive reframing and denial than a low one, and (3) Self-blame was employed by patients more than by their caregivers. It was concluded that a high level of posttraumatic growth in liver transplant recipients is associated with more use of healthy coping strategies, basically active coping, instrumental support, and emotional support.Ministerio de Economía y Competitividad PSI2014-51950-
    corecore