The main goal of this PhD Thesis is to understand the teacher's thoughts and action when he or she is immersed in the activity of teaching.To do so, it describes the procedures used to model two teachers' practice with respect…

En la tesis se aborda el problema de obtener una versión certificada de un resultado fundamental en Álgebra Homológica, conocido como "Lema de Perturbación Básico". Dicho resultado es una pieza central del sistema "Kenzo", software dedicado al cálculo simbólico en…

La Genética Forense es una de las ramas de la biomedicina que ha mostrado un vertiginoso desarrollo científico. A raíz de este crecimiento, numerosas organizaciones internacionales oficiales han adoptado sistemas de análisis de ADN que pudieran ser transferidos y equiparados…

Some applications such as radio astronomy and deep space communications require very sensitive receivers. This dissertation deals with the cryogenic technology applied to the microwave engineering and focuses on the design of very low noise amplifiers both in hybrid (MIC)…

Eighty years after the discovery of penicillin, the interest of this ß-lactam antibiotic at industrial level is still remarkable. Despite the good background knowledge, little is known on how Penicillin chrysogenum became a good penicillin overproducer, and much of the…

Resource management and performance models constitute important aspects for parallel applications' performance analysis and tuning. Defining performance models associated with the application structure has been proven useful for implementing dynamic tuning tools. However, for extending this strategy to complex pplications…

Understanding how materials deform and break is a subject of critical importance in industry. At the same time, it requires from the knowledge of the basic processes governing the phenomenon and hence, fundamental physics research is a must. The presence…

El objetivo de esta tesis es determinar los patrones de variabilidad espacio-temporal que siguen las comunidades de macroinvertebrados en los ríos de Cantabria, aplicando este conocimiento a los procedimientos de evaluación del estado ecológico de los ecosistemas fluviales Cantábricos. La…

From the earliest hardware and software days to the internet era, complexity of computer systems has been something computer scientists, engineers, and programmers have had to deal with. Important fields of research and technology have originated, developed, or matured as…

Since Marconi succeeded in carrying out the first wireless transmission in 1894, experimental research has been always linked with wireless communications. Today, most wireless communications research relies only on computer simulations. Although computer simulations are necessary and recommendable for wireless…