Abstract. In this paper we describe a framework for robust system maintenance that addresses specific challenges of data-centric applications. We show that for data-centric applications, classical simultaneous roundtrip engineering approaches are not sufficient. Instead we propose an architecture that is an integrated model-based approach for software development, database access and data migration. We explain the canonical development process to exploit its features. We explain how the approach fits into the model-driven architecture vision. We report on experiences with the approach in the IMIS environmental mass database project.
Von den Bestandteilen des Adkins‐Katalysators wurden CuCr2O4 und Cu2Cr2O4 magnetisch mit Hilfe von ESR‐ und Suszeptibilitätsmessungen im Temperaturbereich von −190 bis +20°C untersucht. Beide Verbindungen sind bei Zimmertemperatur paramagnetisch. Der Spinell (CuCr2O4) zeigt unterhalb 135°K ferromagnetisches Verhalten, während Cu2Cr2O4 mit abnehmender Temperatur zunehmenden antiferromagnetischen Charakter aufweist.
Coated catalysts, consisting of a compact ceramic core and a shelly coat prepared by mixing TiO2 with vanadium oxalate are investigated After thermal decomposition of the oxalate crystalline phases of vanadium oxide were observed on the anatase surface area. The thermal transformation of anatase into rutile is determined by these phases as proved by X‐ray analysis. A model describes the formation of V6O13 and the transformation of anatase into rutile by structural fits.
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