La climatología histórica es una especialidad que empieza a tener en Europa un nutrido colectivo de investigadores. El interés por mejorar el conocimiento de la variabilidad climática ha llevado a recuperar información de los archivos históricos para caracterizar el clima…

Current reasoning systems attempt to model an agent's knowledge and interaction with its environment in a symbolic manner. This environment, its world is generally dynamic and changing due to natural evolution or the actions of other agents that are a…

2008

2008

Data mining is at the core of the knowledge discovery process. However, an initial preprocessing step is crucial for assuring reliable results within this process. Preprocessing of data is a time-consuming and non-trivial task since data quality issues should be…

Knowledge on evapotranspiration is essential in quantifying water use depletion and to allocate scarce water resources to competing uses. Despite that an extensive literature describes the theoretical mechanisms of turbulent water vapour transport above and within crop canopies fewer studies…

One of the most difficult problems that humanity currently faces is the sustainable development of our society, i.e. how to meet the needs of the present without compromising the ability of future generations to meet their own needs. Solving this…

La epidemia del VIH/SIDA en el Ecuador se encuentra todavía en un estado concentrado con seroprevalencias en la población general alrededor del 0,3 %. Sin embargo, en las poblaciones de mayor afectación, los hombres teniendo sexo con hombres (HSH) y…

Ce mémoire s'emploie à étudier les corps quadratiques réels ainsi qu'un élément particulier de tels corps quadratiques réels : l'unité fondamentale. Pour ce faire, le mémoire commence par présenter le plus clairement possible les connaissances sur différents sujets qui sont…

2007