Técnicas FT-IR de transmissão, reflexão atenuada (ATR), reflexão difusa (DRIFT), microscopia acoplada ao FT-IR (MIC/FT-IR) e detecção fotoacústica (PAS) foram utilizadas para a caracterização de filmes multicamadas. As técnicas ATR, MIC/FT-IR e PAS apresentaram os melhores resultados, provavelmente em função da possibilidade de análise somente da superfície das amostras com cristal (ATR), análise de cada camada da amostra separadamente (MIC/FT-IR) e possibilidade de variação da velocidade de obtenção do espectro (PAS). Dados de análises de microscopia ótica (MO) e calorimetria exploratória diferencial (DSC) foram usados, associados aos dados FT-IR, para a caracterização completa dos materiais.
Modeling learner interaction in EducationalAdaptive Hypermedia Systems (EAHS) is not normally driven by the pedagogical model used in the system. It is argued in this paper that besides driving the modeling of learner interaction, the pedagogical model is a key aspect in modeling the system as a whole. This paper presents a proposal to define and present learner interaction based on Problem-based Learning. Though the proposed process has been used only in academic context, the preliminary use has indicated its potential of use in real contexts.
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