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biogeochemistry, iron reduction, metals and contaminants, soil aggregates, selenium kinetics of organic matter degradation, nitrate reduction, soil and environmental biogeophysics, biogeochemical cycles, fate and transport of nutrients, sulfate reduction, wetland soils, littoral sediments, spatial variation in biogeochemical processes

knowledge representation, adaptive learning, artificial intelligence, learning analytics, Recommender Systems, higher education, data science, Digital Learning Environments, cognitive modeling, Big Data in Education, Knowledge Tracing, Formative Assessment, intelligent tutoring systems, Online Learning, psychometrics, Educational Data Mining