Feste Mineralbrennstoffe, insbesondere Kohle

Ohne Zusammenfassung     

Spurenanalyse mit der flammenlosen AAS unter Verwendung fester Proben

Zusammenfassung Die direkte Bestimmung von Spurenelementen in metallischen und oxidischen Proben im Gehaltsbereich 0,1–10 g/g (entsprechend 10^–5-10^–3 Massen-%) wird beschrieben. Hierzu bietet sich die Verwendung einer speziellen Graphitofen-Boottechnik an, mit deren Hilfe die Proben direkt in fester Form eingebracht werden können. Zwei unterschiedliche Verfahren sind erforderlich: die mehrfache Aufschmelzung für metallische Proben und die zweifache Verdampfung von oxidischen Stoffen. Die Resultate beider Verfahren werden diskutiert.

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Trace analysis by non-flame atomic absorption spectrometry using compact samples

Summary The direct determination of trace elements of metallic and oxidic samples in the range of 0.1–10 g/g (or 10^–3–10^–5 mass-%) is described by using a special graphite furnace boat-technique with direct sample input. Two different procedures are necessary: a multiple heating technique in case of metallic samples and a double vapourization technique in case of oxides. The results using both techniques are discussed.

Für die Durchführung der zahlreichen praktischen Versuche danken wir den Herren H. Topp und H. Loepp.     

Phosphor in Silicatgesteinen

Ohne Zusammenfassung     

Chelometrische Bestimmung von Titan mit ?DTA

Ohne Zusammenfassung     

Algebraic construction of a Nambu bracket for the two-dimensional vorticity equation

So far fluid mechanical Nambu brackets have mainly been given on an intuitive basis. Alternatively an algorithmic construction of such a bracket for the two-dimensional vorticity equation is presented here. Starting from the Lie-Poisson form and its algebraic properties it is shown how the Nambu representation can be explicitly constructed as the continuum limit from the structure preserving Zeitlin discretization.     

Experimental investigation of a flexible high-water protection system in a down-scale water channel flow

As part of an interdisciplinary major project regarding the development of a flexible and efficiently installable high-water protective system we investigated the behaviour of different system parts of flexible channel walls (thin, plastic slides/membranes) and types of self-installing water barricades subjected to different water channel flows experimentally and numerically. In the experiments we studied the strain of different flexible channel walls and the efficiency of various water barricades in a down-scale model by optical deformation, flow velocity and time measurements, respectively. We varied the water height as well as the representative flow velocity of the water channel flow and we also examined the influence of water waves onto these high-water protective system parts. Selected results will be shown and described concerning the stress on the used model-slide. In addition we applied similarity theory not only for general data presentation but also to generate findings regarding a future practical implementation in technical applications. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)