Estudio de técnicas de control Grid-Forming para aerogeneradores marinos

[ES] En un contexto de transición ecológica sin precedentes la generación eólica en general, y la aerogeneración Off-Shore en particular; tiene y tendrá un papel fundamental para la sostenibilidad energética del planeta. En este sentido, para un aprovechamiento óptimo de la energía contenida en el viento es necesario implementar técnicas de control que regulen el funcionamiento de los complejos sistemas que forman un aerogenerador. El presente estudio tiene como finalidad realizar una comparativa entre dos técnicas de control vectorial basadas en la filosofía Grid-Forming y haciendo uso de un doble convertidor de potencia Back-to-Back que garantice la independencia del control de red y del control del generador. De este modo, se propone un control común que regule el funcionamiento del PMSG asegurando un nivel de tensión estable en el enlace de corriente continua del convertidor; y a partir de este punto se implementan las técnicas de control de red fundamentadas en Control Orientado de Tensión para su posterior análisis y comparación. Las estrategias de control objeto del estudio se basan el Droop Control y en Virtual Synchronous Machine.[EN] Nowadays we live in a world that is deeply marked by the ecological transition. Transition in which the wind generation has and will have an important role for the Earth¿s energetic sustainability. In that way, advanced control systems that allow us to optimize wind energy extraction are needed. In this study, a comparison between two Grid-Forming vector control strategies is presented. The system implemented is based on the using of a Back-to-Back converter, which ensures the grid and the generator decoupled control, and the implementation of a common PMSG control that will be used by both grid controllers. The Machine-Side Controller main objective is to assure a stable voltage level on the converter¿s DC-Link as well as to optimize the wind energy extraction. With the DC voltage properly controlled, the Voltage Oriented Control based Grid-Side Controllers are implemented and studied. The techniques presented in this study are Droop control and Virtual Synchronous Machine control.García Carcedo, D. (2020). Estudio de técnicas de control Grid-Forming para aerogeneradores marinos. Universitat Politècnica de València. http://hdl.handle.net/10251/147952TFG

Estimación de rendimiento de cultivos agrícolas: integración de datos derivados de monitores de rendimiento y productos del sensoramiento remoto

Tesis (Magister en aplicaciones de información espacial)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2022.Maestría conjunta con el Instituto de Altos Estudios Espaciales "Mario Gulich"-CONAE.Fil: Carcedo, Diego Nahuel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Carcedo, Diego Nahuel. Comisión Nacional de Actividades Espaciales. Instituto de Altos Estudios Espaciales Mario Gulich; Argentina.En el contexto de un aumento demográfico continuo, la seguridad alimentaria global enfrenta desafíos, acentuados por el cambio climático. La producción de cultivos fundamentales como el maíz se ve afectada por las perturbaciones climáticas, lo que destaca la necesidad de soluciones resilientes. La teledetección emerge como un recurso práctico para estimar los rendimientos de maíz, al proporcionar vasta información de manera remota sobre el crecimiento y las condiciones del cultivo permitiendo ajustes precisos en la gestión agrícola. Esta capacidad no solo optimiza la eficiencia de los recursos para los agricultores, sino que también guía la formulación de políticas adaptativas a nivel local y global, con miras a asegurar la disponibilidad sostenible de alimentos. La recopilación de datos georreferenciados, especialmente a través de sistemas de monitoreo de cosecha, brinda una perspectiva detallada de los rendimientos agrícolas a nivel geográfico. La investigación, basada en información derivada de sensores satelitales, ha generado modelos de predicción de rendimiento de maíz a escala regional y paisajística. En esta investigación se trabajó sobre la hipótesis que la variabilidad de variables derivadas de información de sensado remoto medidas a nivel de lote permiten predecir el rendimiento del cultivo de maíz medido con monitores de cosecha. El objetivo principal de esta tesis fue generar modelos paramétricos y no paramétricos para predecir el rendimiento de maíz en la zona núcleo de la República Argentina a nivel de lote, tomando como datos de entrada información geoespacial de sensores remotos y utilizando observaciones de campo de 33 lotes. Se probó la efectividad de una metodología que permite depurar, estandarizar y re-escalar archivos de datos georreferenciados, que facilitó la interpolación geoestadística de manera cuasiautomática. Se probaron diferentes marcos teóricos para predecir el rendimiento desde información geo-espacial de sensores remotos, información climática y de relieve: modelos de regresión lineal múltiple (RLM) y regresión basada en el método de aprendizaje automático “bosque aleatorio” (RFR). Se ponderó la variabilidad intra lote de cada una de las variables predictoras calculando el desvío estándar y el rango. El modelo RLM con interacciones (RMSE: 1.48) explicó un 4,12 % más de la variabilidad del rendimiento que el mejor modelo RFR (RMSE: 1.87). Siendo ambos modelos eficientes para explicar y predecir la variabilidad de los rendimientos. La evidencia aportada por esta tesis sugiere que se pueden construir mejores protocolos de predicción estadística de rendimiento de maíz a nivel regional utilizando el modelo RLM.In the context of ongoing demographic growth, global food security faces significant challenges, accentuated by climate change. The production of fundamental crops like maize is affected by climatic disruptions, underscoring the need for resilient solutions. Remote sensing emerges as an essential resource for estimating maize yields, providing extensive information remotely on crop growth and conditions, allowing precise adjustments in agricultural management. This capability not only optimizes resource efficiency for farmers but also guides the formulation of adaptive policies at local and global levels, aiming to ensure sustainable food availability. The collection of georeferenced data, especially through harvest monitoring systems, offers a detailed perspective on agricultural yields at a geographical level. Research, based on information derived from satellite sensors, has generated predictive models for maize yield at regional and landscape scales. In this research, we worked on the hypothesis that the variability of multiple variables derived from remote sensing information measured at the field level allows predicting the yield of the corn crop measured with harvest monitors. The main objective of this thesis was to generate parametric and non-parametric models to predict corn yield in the core zone of the Argentine Republic at the field level, taking as input geospatial data from remote sensors and using data from 33 fields. In first place, the effectiveness of a methodology that allows debugging, standardizing and re-scaling georeferenced data files was tested, which facilitated geostatistical interpolation in a quasi-automatic manner. Secondly, different theoretical frameworks were tested to predict maize yield from climatic, relief and remote sensors geospatial information: multiple linear regression models (RLM) and regression based on the machine learning method random forest"(RFR). The intra-lot variability of each of the predictor variables was weighted by calculating the standard deviation and the range. The RLM model without interactions (RMSE: 1.48) explained 4,12 % more of the performance variability than the best RFR model (RMSE: 1.87). As both models are efficient to explain and predict the variability of yields, the evidence provided by this thesis suggests that better statistical prediction protocols for maize yield can be built at the regional level using the RLM model.Fil: Carcedo, Diego Nahuel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Carcedo, Diego Nahuel. Comisión Nacional de Actividades Espaciales. Instituto de Altos Estudios Espaciales Mario Gulich; Argentina

Evaluación de algoritmos de clasificación supervisada en plataformas web de la nube (Google Earth Engine) aplicado al mapeo de coberturas forrajeras

El objetivo de este trabajo fue experimentar el uso d dos algoritmos y evaluar su desempeño como herramientas para clasificar coberturas de vegetación, particularmente forrajeras, en el valle de Traslasierra, de la provincia de Córdoba, Argentina. SVM y RF, fueron seleccionados entre los algoritmos de clasificación disponibles en la interfaz de la aplicación de programación del Google Earth Engine (GEE).Sociedad Argentina de Informática e Investigación Operativa (SADIO

Análisis en función del género de los jugadores sobre la percepción que tienen de su entrenador

[ES] El objetivo de este estudio fue analizar en función del género de los jugadores la percepción que tienen de sus entrenadores respecto a su estilo de liderazgo auténtico, justicia percibida, competencia y atención a las necesidades psicológicas básicas . Participaron en el estudio 217 jugadores de fútbol y balonmano (147 hombres y 70 mujeres). Las deportistas de género femenino a diferencias de los de género masculino, mostraron niveles más altos en las variables psicológicas seleccionadas. Este estudio debería ser útil a los entrenadores para reconocer cuales son las percepciones de sus deportistas, y de este modo, poder matizar su intervención en función del género del equipo al cual se entrene.[EN] This study aimed to analyze gender differences in athletes' perception of their coaches' authentic leadership style, perceived justice, competence, and attention to basic psychological needs. A total of 217 soccer and handball players (147 men and 70 women) participated. In contrast to male athletes, female athletes showed higher levels in the selected variables. This study should be helpful for coaches to identify their athletes' different perceptions depending on gender. Consequently, coaches may use a different approach depending on their team’s gender.S

Well-Being and Throwing Speed of Women Handball Players Affected by Feedback

[EN] This research aims at studying the e ect of feedback on well-being (vitality, and positive and negative a ect), competence valuation, perceived competence, motivation, and performance (throwing speed and accuracy) in a throwing task. Thirty nine expert women handball players, with experience in international handball competitions, participated in this study. They were indiscriminately ascribed to one of three di erent experimental conditions measuring feedback: (positive, negative, and none). Significant di erences in well-being (positive a ect) and throwing speed were found among the three feedback groups. More concretely, higher levels of positive a ect and throwing speed were found in the negative feedback group in comparison with the other two groups (positive and no-feedback). These results have important implications for athletes’ well-being and performance, and for coaches’ training programs.S

Does the effect of feedback modulate the coach's perception of competition?

[ES] El objetivo fue analizar el efecto de diferentes tipos de feedback sobre variables psicológicas y de rendimiento en función de la percepción del deportista de la competencia del entrenador. Se realizó un estudio de caso con 33 futbolistas asignados aleatoriamente a tres condiciones experimentales (feedback positivo, negativo y ausencia de feedback). Se midieron velocidad y precisión de lanzamientos a portería, valoración de competencia, competencia percibida, motivación autónoma y vitalidad subjetiva. Se empleó un nivel α de 0,05 para los análisis. El grupo feedback positivo exhibió niveles más altos de valoración de competencia, competencia percibida, motivación autónoma y bienestar, que los de feedback negativo y ausencia de feedback, en sujetos con alta percepción de competencia del entrenador. Este efecto no se observó en aquellos con baja percepción de competencia del entrenador. La percepción del jugador sobre la competencia del entrenador podría ser un factor en la modulación de las diferencias generadas en cuanto al tipo de feedback.[EN] The purpose of this study was to analyze the effect that different types of feedback had on psychological and performance variables as a function of an athlete´s perception of his/her coach´s competence. A case study was conducted with 33 soccer players randomly assigned to three experimental conditions (positive and negative feedback and no feedback). Shot speed and accuracy, competence valuation, perceived competence, autonomous motivation and subjective vitality were measured. An α-level of .05 was employed for all the analyses. Positive feedback group exhibited higher levels of competence valuation, perceived competence of the player, autonomous motivation, and well-being than the negative and neutral feedback groups only in those subjects who had a high perception of the coach's competence. This effect was not observed in those with a low perception of coach competence. In this respect, the players’ perception of coach’s competence could be a factor in modulating the differences generated with regard to the type of feedback received.S

Perception of Coach According to the Role of Starter or Substitute in the Final Stage of the Season

[EN] This paper examines the athletes’ perception of their coaches according to the role of starter or substitute in the final phase of the season. The variables analyzed were: leadership style, perceived justice, competence, and support for basic psychological needs. A longitudinal study was developed, evaluating the participants at two different stages: the end of the season and seven weeks before. A total of 112 football and handball players participated in this study, 78 completing the questionnaire at the two waves. The final sample comprised 51 starters (80.39% males) and 27 substitutes (70.37% males) who evaluated their coaches’ leadership, competence, and support of the players’ psychological needs. The interaction moment of measurement (seven weeks before the end of the season vs. end of the season) * group (starters vs. substitutes) was statistically significant for the variables authentic leadership, perceived justice, and the basic psychological need of competence. Post hoc analyses revealed a significant decline in the perception of authentic leadership from coaches, perceived justice, and support of the psychological need of competence at the end of the season only in those in a starter position, with no change observed in the substitutes group. The findings show that the perceptions of coaches among starting players deteriorates significantly in the final phase of the season, while those among substitutes remain unaffected.S

Sexual Satisfaction and Mental Health in Prison Inmates

The main goal of this study was to investigate the association between sexual satisfaction and mental health, and the combined e ect of two previously found, statistically significant moderators: partner status and sexual abstinence. In-person interviews were conducted with 223 participants (49.327% males and 50.673% females). The e ect of sexual satisfaction on mental health and the interactions of sexual satisfaction partner status, sexual satisfaction sexual abstinence, and sexual satisfaction partner status sexual abstinence were examined using simple moderation and moderated moderation tests after controlling for a set of sociodemographic, penitentiary, and interpersonal variables. Results revealed a direct relationship between sexual satisfaction and mental health only for the sexually abstinent group. Partner status was not significant as a moderator. It seems that the lack of sexual relationships is more powerful as a moderator than the lack of a romantic relationship. Additionally, the sexually abstinent group showed lower levels of sexual satisfaction in those with a partner outside or inside prison, and lower mental health independently of the current romantic status, than sexually active inmates. These findings point to the importance of sexual satisfaction to mental health in sexual situations of extreme disadvantage

Sexual Satisfaction and Mental Health in Prison Inmates

The main goal of this study was to investigate the association between sexual satisfaction and mental health, and the combined effect of two previously found, statistically significant moderators: partner status and sexual abstinence. In-person interviews were conducted with 223 participants (49.327% males and 50.673% females). The effect of sexual satisfaction on mental health and the interactions of sexual satisfaction X partner status, sexual satisfaction X sexual abstinence, and sexual satisfaction X partner status X sexual abstinence were examined using simple moderation and moderated moderation tests after controlling for a set of sociodemographic, penitentiary, and interpersonal variables. Results revealed a direct relationship between sexual satisfaction and mental health only for the sexually abstinent group. Partner status was not significant as a moderator. It seems that the lack of sexual relationships is more powerful as a moderator than the lack of a romantic relationship. Additionally, the sexually abstinent group showed lower levels of sexual satisfaction in those with a partner outside or inside prison, and lower mental health independently of the current romantic status, than sexually active inmates. These findings point to the importance of sexual satisfaction to mental health in sexual situations of extreme disadvantage