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Letztere basieren auf Liquidelementen und sind auf andere Transportprozesse, bspw. im Verkehrsfluss, \u00fcbertragbar. Zusammen mit den jeweiligen Modellannahmen f\u00fchren fundamentale Bilanzgleichungen auf quasilineare partielle Differentialgleichungen erster Ordnung, die mittels des Charakteristikenverfahrens in retardierte Ein-\/Ausgangsgleichungen \u00fcberf\u00fchrt werden. Diese Darstellung ist f\u00fcr den Reglerentwurf und die Simulation vorteilhaft. Der praktische Hintergrund des Beitrags ist der Fallfilmverdampferprozess. 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