Análisis experimental de ondas largas en la bocana del puerto de Gijón

En este trabajo se presenta una metodología basada en el análisis espectral para la determinación de las características de las ondas infragravitatorias en la bocana del Puerto de Gijón. A partir de las mediciones de un sensor de presión colocado en dicha bocana se obtuvo información del oleaje, tanto en la banda gravitatoria como en la banda infragravitatoria. Tras una selección de los oleajes de tipo swell, respecto de la totalidad de los estados de mar registrados, se ajustó una fórmula empírica para la determinación de la energía total de onda larga, a partir de la altura de ola significante y del periodo de onda corta. Los valores del coeficiente de correlación son altos, tanto para los datos considerados como swell, como para la totalidad de los datos registrados. Para la determinación del periodo de pico de onda larga se propone también una formulación empírica, aunque el coeficiente de correlación es inferior

Knowledge of managerial competencies: cross-cultural analysis between American and European students

This paper reports on the differences of managerial competencies among MBA students from American and European business schools. The results of this research suggest that there are certain differences of not only nationality but also gender. The study also points out the need for different managerial competency profiles to better assess MBA students looking for future career development. The results of this study indicate that there is a difference at the national level between assessed managerial competencies of American and European MBA students that can be attributed to cultural factors. This conclusion confirms the findings of Chong (2008) and Akinola, Martin, and Phillips (2018). Secondly, at the organisational level, cultural differences manifest themselves in some but not all assessed managerial competencies. These research findings provide empirical evidence which suggests that, in managing and advising international and global future managers, one ought to distinguish between external, interpersonal and personal managerial competencies which are applicable across cultures and which are prone to cultural differences

Adaptive Pitch Controller of a Large-Scale Wind Turbine Using Multi-Objective Optimization

This paper deals with the control problems of a wind turbine working in its nominal zone. In this region, the wind turbine speed is controlled by means of the pitch angle, which keeps the nominal power constant against wind fluctuations. The non-uniform profile of the wind causes tower displacements that must be reduced to improve the wind turbine lifetime. In this work, an adaptive control structure operating on the pitch angle variable is proposed for a nonlinear model of a wind turbine provided by FAST software. The proposed control structure is composed of a gain scheduling proportional–integral (PI) controller, an adaptive feedforward compensation for the wind speed, and an adaptive gain compensation for the tower damping. The tuning of the controller parameters is formulated as a Pareto optimization problem that minimizes the tower fore-aft displacements and the deviation of the generator speed using multi-objective genetic algorithms. Three multi-criteria decision making (MCDM) methods are compared, and a satisfactory solution is selected. The optimal solutions for power generation and for tower fore-aft displacement reduction are also obtained. The performance of these three proposed solutions is evaluated for a set of wind pattern conditions and compared with that achieved by a classical baseline PI controller

Shipbuilding 4.0 Index Approaching Supply Chain

The shipbuilding industry shows a special interest in adapting to the changes proposed by the industry 4.0. This article bets on the development of an index that indicates the current situation considering that supply chain is a key factor in any type of change, and at the same time it serves as a control tool in the implementation of improvements. The proposed indices provide a first definition of the paradigm or paradigms that best fit the supply chain in order to improve its sustainability and a second definition, regarding the key enabling technologies for Industry 4.0. The values obtained put shipbuilding on the road to industry 4.0 while suggesting categorized planning of technologies

Methodology for Olive Pruning Windrow Assessment Using 3D Time-of-Flight Camera

The management of olive pruning residue has shifted from burning to shredding, laying residues on soil, or harvesting residues for use as a derivative. The objective of this research is to develop, test, and validate a methodology to measure the dimensions, outline, and bulk volume of pruning residue windrows in olive orchards using both a manual and a 3D Time-of-Flight (ToF) camera. Trees were pruned using trunk shaker targeted pruning, from which two different branch sizes were selected to build two separate windrow treatments with the same pruning residue dose. Four windrows were built for each treatment, and four sampling points were selected along each windrow to take measurements using both manual and 3D ToF measurements. Windrow section outline could be defined using a polynomial or a triangular function, although manual measurement required processing with a polynomial function, especially for high windrow volumes. Different branch sizes provided to be significant differences for polynomial function coefficients, while no significant differences were found for windrow width. Bigger branches provided less bulk volume, which implied that these branches formed less porous windrows that smaller ones. Finally, manual and 3D ToF camera measurements were validated, giving an adequate performance for olive pruning residue windrow in-field assessment

Maternal and fetal risks of planned vaginal breech delivery vs planned caesarean section for term breech birth: A systematic review and meta-analysis

Background Breech presentation delivery approach is a controversial issue in obstetrics. How to cope with breech delivery (vaginal or C-section) has been discussed to find the safest in terms of morbidity. The aim of this study was to assess the risks of foetal and maternal mortality and perinatal morbidity associated with vaginal delivery against elective caesarean in breech presentations, as reported in observational studies. Methods Studies assessing perinatal morbidity and mortality associated with breech presentations births. Cochrane, Medline, Scopus, Embase, Web of Science, and Cuiden databases were consulted. This protocol was registered in PROSPERO CRD42020197598. Selection criteria were: years between 2010 and 2020, in English language, and full-term gestation (37-42 weeks). The methodological quality of the eligible articles was assessed according to the Newcastle-Ottawa scale. Meta-analyses were performed to study each parameter related to neonatal mortality and maternal morbidity. Results The meta-analysis included 94 285 births with breech presentation. The relative risk of perinatal mortality was 5.48 (95% confidence interval (CI) = 2.61-11.51) times higher in the vaginal delivery group, 4.12 (95% CI = 2.46-6.89) for birth trauma and 3.33 (95% CI = 1.95-5.67) for Apgar results. Maternal morbidity showed a relative risk 0.30 (95% CI = 0.13-0.67) times higher in the planned caesarean group. Conclusions An increment in the risk of perinatal mortality, birth trauma, and Apgar lower than 7 was identified in planned vaginal delivery. However, the risk of severe maternal morbidity because of complications of a planned caesarean was slightly higher

Modeling Major Rural Land-Use Changes Using the GIS-Based Cellular Automata Metronamica Model: The Case of Andalusia (Southern Spain)

The effective and efficient planning of rural land-use changes and their impact on the environment is critical for land-use managers. Many land-use growth models have been proposed for forecasting growth patterns in the last few years. In this work; a cellular automata (CA)-based land-use model (Metronamica) was tested to simulate (1999–2007) and predict (2007–2035) land-use dynamics and land-use changes in Andalucía (Spain). The model was calibrated using temporal changes in land-use covers and was evaluated by the Kappa index. GIS-based maps were generated to study major rural land-use changes (agriculture and forests). The change matrix for 1999–2007 showed an overall area change of 674971 ha. The dominant land uses in 2007 were shrubs (30.7%), woody crops on dry land (17.3%), and herbaceous crops on dry land (12.7%). The comparison between the reference and the simulated land-use maps of 2007 showed a Kappa index of 0.91. The land-cover map for the projected PRELUDE scenarios provided the land-cover characteristics of 2035 in Andalusia; developed within the Metronamica model scenarios (Great Escape; Evolved Society; Clustered Network; Lettuce Surprise U; and Big Crisis). The greatest differences were found between Great Escape and Clustered Network and Lettuce Surprise U. The observed trend (1999–2007–2035) showed the greatest similarity with the Big Crisis scenario. Land-use projections facilitate the understanding of the future dynamics of land-use change in rural areas; and hence the development of more appropriate plans and policies

Estrutura Fatorial e Propriedades Psicométricas da Escala de Suporte à Transferência de Treinamento

This study aimed to analyze the factor structure and psychometric properties of a Training Transfer Support Scale (STTS) and its relationship with the effectiveness of training at work. A total of 1,540 employees of a public Brazilian bank participated in this study by responding to the STTS and a measure of transfer of training after taking part in an online course. Reliability analysis, confirmatory factor analysis, and multiple regressions were conducted. A three-factor structure was found and a high level of fit for the models. Evidence of the construct validity of the measures was obtained, and the participants’ perception of support was positive related to the transfer of training to the workplace and overall performance.O estudo objetivou analisar a estrutura fatorial e as propriedades psicométricas da Escala de Suporte à Transferência de Treinamento (ESTT) e sua relação com a efetividade do treinamento no trabalho. Um total de 1.540 funcionários de um banco estatal brasileiro participou do estudo respondendo à ESTT e à escala de impacto do treinamento no trabalho em amplitude depois de realizar um curso online. Foram realizadas análises de consistência interna, fatorial confirmatória e de regressões múltiplas. Uma estrutura com três fatores foi encontrada, bem como um alto nível de ajuste para os modelos. As medidas apresentam evidências de validade de construto e o suporte percebido pelos participantes esteve positivamente relacionado com a transferência de competências para o trabalho e desempenho geral

La termografía infrarroja como técnica de visualización de patologías musculares leves

La termografía infrarroja viene siendo una tecnología utilizada en el entorno clínico desde hace tiempo y que gana aplicaciones y extensión en este sector dado los avances técnicos de las cámaras y el aumento de la facilidad de adquirir un equipo. En este aumento de la utilización clínica de esta tecnología tiene gran utilidad la aplicación de dicha técnica a la visualización de patologías musculo-esqueléticas leves dada su gran capacidad de formar imágenes cada día más nítidas y exhaustivas gracias a la radiación infrarroja emitida, en este caso, por los pacientes y que los equipos de hoy día permiten formar llegando a poder asignar dos píxeles de distinto color a temperaturas que difieren entre sí 0,01 ºC. Es en este caso la capacidad gráfica de transformar la emisión de radiación infrarroja de cualquier cuerpo en una imagen y los distintos patrones gráficos que se pueden apreciar, lo que permite que una magnitud como la temperatura aporte información con gradientes tan pequeños. Como ejemplo, del que se expondrá un caso concreto en este artículo, valga la utilidad frente a lesiones cervicales leves producidas por accidentes de tráfico a baja velocidad que son difícilmente objetivables y valorables con otras técnicas.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec