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This volume is useful for courses where the linkage between theory and research is emphasized
Abstract: Der Begriff Geschichtsbewusstsein ist seit Ende der 1960er Jahre ein zentraler Begriff in der Geschichtsdidaktik
daß einerseits jedes Individuum unterschiedliche Zielvorstellungen besitzt
[¿] in Wahrheit alles unsicher und im Schwanken begriffen ist¿
Drag Reduction of Turbulent Flows by Additives 87 This volume is useful forDrag Reduction of Turbulent Flows by Additives is the first treatment of the subject in book form. The treatment is extremely broad, ranging from physicochemical to hydromechanical aspects. The book shows how fibres, polymer molecules or surfactants at very dilute concentrations can reduce the drag of turbulent flow, leading to energy savings. The dilute solutions are considered in terms of the physical chemistry and rheology, and the properties of
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