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In Global Navigation Satellite Systems (GNSS), the on-board clocks are a key component from which timing and navigation signals are generated. This thesis reviews the performance of the first Passive Hydrogen Maser (PHM) launched by the Galileo system in 2008; and demonstrates how the new PHM can be consider as the best clock in space, pushing the physical clock error contribution below the noise floor of geodetic time transfer capabilities. Furthermore, overall GNSS clock peformance is reviewed

This book constitutes the refereed proceedings of the 15th Mexican Conference on Pattern Recognition, MCPR 2023, held in Tepic, Mexico, during June 21-24, 2023. The 30 full papers presented in this book were carefully reviewed and selected from 61 submissions. The papers are divided into the following topical sections: pattern recognition and machine learning techniques; deep learning and neural networks; medical applications of pattern recognition; language processing and recognition; and industrial applications of pattern recognition.

El presente libro es un texto basico para profesores, entrenador y estudiantes que se aventuran en los campos del entrenamiento, de la educacion fisica y de la preparacion fisica, en general, y en el tenis en particular. Se intenta abordar desde este texto aquellos aspectos mas generales y necesarios en relacion al conocimiento de aquellas principales lesiones derivadas de la practica deportiva, siendo una herramienta util para profesores, tecnicos, entrenadores y preparadores a la hora de planificar sus sesiones y entrenamientos teniendo en cuenta los posibles riesgos asociados a la practica...