Ikerketa-Artikuluak
https://hdl.handle.net/20.500.11984/473
2024-03-19T11:01:25ZInfluencia de los datos biográficos y experiencia deportiva de los estudiantes universitarios de educación fisíco-deportiva sobre sus creencias, actitudes y autoconcepto físico
https://hdl.handle.net/20.500.11984/6294
Influencia de los datos biográficos y experiencia deportiva de los estudiantes universitarios de educación fisíco-deportiva sobre sus creencias, actitudes y autoconcepto físico; Influence of biographical data and sports experience of university students of physical-sports education on their beliefs, attitudes and physical self-concept
Albisua, Neritzel
El propósito de este estudio fue examinar cómo influyen las experiencias deportivas y su biografía en cada sujeto, con respecto a sus creencias y actitudes de cara a la educación física y su autoconcepto físico. Se utilizaron cuatro escalas diferentes en 826 estudiantes de 18-24 años en total que vivían en el País Vasco, encontrado por método de muestreo aleatorio simple. La primera escala es la "Escala de información personal" que consta de 4 ítems para determinar las características socio-personales, sobre la experiencia deportiva, perfl de los entrenadores/as y calificación en Educación Física. En cuanto a la segunda escala utilizada fue Feelings about Physical Education (Bourke, & Frampton, 1992) que examina las Percepciones sobre la Educación Física (PEF). La tercera escala utilizada fue el Cuestionario de actitudes hacia la educación física CAEF (Moreno, Rodriguez y Gutierrez, 2006), en su validación al Euskera de Actitudes hacia la disciplina de Educación Física (ADEF), y por último el Cuestionario AFI, Autokontzeptu Fisikoaren Itaunketa (Esnaola, 2006), que examina el autoconcepto físico de los sujetos. Los datos del estudio fueron analizados por SPSS 25 paquete de software. Se realizó un análisis de componentes principales (ACP) con el propósito de explorar la correlación entre escalas, así como también entre las escalas y las categorías de las variables biográficas y de experiencia deportiva. Se determinó que hay correlación de la gran mayoría de las escalas de los cuestionarios. En conclusión, se hayo una clara separación entre dos grupos o perfiles de estudiantes determinada principalmente por las respuestas a los cuestionarios de actitudes hacia la actividad física, creencias y autoconcepto.; The purpose of this study was to examine how sports experiences and their biography influence each subject, with respect to their beliefs and attitudes towards physical education and their physical self-concept. Four different scales were used in 826 students aged 18-24 years in total who lived in the Basque Country, found by simple random sampling method. The first scale is the "Personal Information Scale" that consists of 4 items to determine the socio-personal characteristics, the sporting experience, profile of the coaches and qualification in Physical Education. As for the second scale used, it was Feelings about Physical Education (Bourke, & Morgan, 2005) that examines Perceptions about Physical Education (PEF). The third scale used was the Questionnaire of attitudes towards physical education CAEF (Morenoet al., 2003), in its validation to the Basque of Attitudes towards the discipline of Physical Education (ADEF), and finally the AFI Questionnaire, Autokontzeptu Fisikoaren Itaunketa (Esnaola, 2006), which examines the physical self-concept of the subjects. The study data were analyzed by SPSS 25 software package. A principal component analysis (PCA) was carried out in order to explore the correlation between scales, as well as between the scales and the categories of the biographical and sports experience variables. It was determined that there is a correlation of the vast majority of the questionnaire scales. In conclusion, there is a clear separation between two groups or profiles of students determined mainly by the responses to the questionnaires on attitudes towards physical activity, beliefs and self-concept.
2023-03-06T00:00:00ZMeasurement Based Stochastic Channel Model for 60 GHz Mmwave Industrial Communications
https://hdl.handle.net/20.500.11984/6293
Measurement Based Stochastic Channel Model for 60 GHz Mmwave Industrial Communications
Osa, Joseba; Mendicute, Mikel
Communications in the mmWave spectrum are gaining relevance in the last years as they are a promising candidate to cope with the increasing demand of throughput and latency in different use cases. Nowadays, several efforts have been carried out to characterize the propagation medium of these signals with the aim of designing their corresponding communication protocols accordingly, and a wide variety of both outdoor/indoor locations have already been studied. However, very few works endorse industrial scenarios, which are particularly demanding due to their stringent requirements in terms of reliability, determinism, and latency. This work aims to provide an insight of the propagation of 60 GHz mmWave signals in a typical industrial workshop in order to explore the particularities of this kind of scenario. In order to achieve this, an extensive measurement campaign has been carried out in this environment and a stochastic channel model has been proposed and validated.
2023-01-01T00:00:00ZHole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for LCO2 and MQL sustainable cooling/lubrication
https://hdl.handle.net/20.500.11984/6289
Hole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for LCO2 and MQL sustainable cooling/lubrication
rodriguez, Iñigo; ARRAZOLA, PEDRO JOSE; CUESTA ZABALAJAUREGUI, MIKEL
Carbon fibre reinforced polymer/titanium stacks (CFRP/Ti6Al4V) are employed in aeronautics due to their excellent weight-to-strength ratio and corrosion properties. However, these same material properties present challenges for hole making which cannot be solved using conventional water-based metalworking fluids (MWFs), as they cause degradation of the composite. Moreover, environmental and health concerns require exploration of alternative cooling/lubrication solutions. In this study, a controlled mixture of liquid carbon dioxide (LCO2) and minimum quantity lubrication (MQL) was supplied through the drilling tool. The effect of varying LCO2 and MQL flow rates was evaluated on cutting forces, temperatures, and several hole quality outputs. The optimal flow rates were then determined through multi-objective optimisation. The results show that the cooling/lubrication flow rate greatly affects the measured outputs, and that supplying LCO2 + MQL with optimised flow rates helps achieve superior quality holes in CFRP, Ti6Al4V and CFRP/Ti6Al4V stacks.
2024-01-01T00:00:00ZA New Battery SOC/SOH/eSOH Estimation Method Using a PBM and Interconnected SPKFs: Part II. SOH and eSOH Estimation
https://hdl.handle.net/20.500.11984/6288
A New Battery SOC/SOH/eSOH Estimation Method Using a PBM and Interconnected SPKFs: Part II. SOH and eSOH Estimation
Lopetegi, Iker; Oca, Laura; IRAOLA, UNAI
Battery management systems (BMSs) are required to estimate many non-measurable values that describe the actual operating condition of batteries; such as state of charge (SOC) or state of health (SOH). In order to improve accuracy, many physical states and parameters can be estimated using physics-based models (PBMs). These estimates could be used to improve the control and
prognosis of batteries. In a series of papers, we propose a new method to estimate internal physical states, SOC, SOH and other electrode-specific state of health (eSOH) parameters of a lithium-ion battery, using interconnected sigma-point Kalman filters (SPKFs) and a single-particle model with electrolyte dynamics (SPMe). This second paper focuses on eSOH parameter estimation. Simulation
results show that the method is capable of estimating the eSOH parameters and key degradation modes that can occur inside a lithium-ion battery cell using only cell voltage and current measurements.
2024-01-01T00:00:00Z