Vergleich einer innovativen mobilen Streifenbewässerung mit einer flächendeckenden Regnerbewässerung

Die gesamte Bewässerungsgabe betrug 96 mm bei der mobile Streifenbewässerung und 195 mm bei dem Sprinkler, was eine Ersparnis von 51 % bedeutet. Die Ergebnisse zeigen deutlich, dass die neue Streifenbewässerung ein Potenzial zur Wassereinsparung in der Landwirtschaft hat

Formation and thermal stability of two-phase microstructures in Al-containing refractory compositionally complex alloys

Phase separation into an A2+B2 two-phase microstructure in refractory compositionally complex alloys (RCCA) has been speculated as being spinodal in nature with continuous chemical distribution during the separation. However, these reactions might instead occur as precipitation by nucleation and growth. In order to unequivocally elucidate the distinct nature of phase separation sequence in RCCA from the system Ta-Mo-Ti-Cr-Al, atom probe tomography and electron microscopy techniques were utilized on samples that were annealed over multiple orders of magnitude in time. The composition 82(TaMoTi)-8Cr-10Al (at.%) was chosen, as it exhibits a two-phase microstructure, with a desired A2 matrix and embedded B2 phase. Quenching the samples from 1200°C resulted in a microstructure consisting of ordered clusters (2 nm) of distinct chemical composition. Subsequent annealing at 800°C to 1000°C leads to an increase in the volume fraction of the precipitating phase, which saturates after 10 h. Further annealing leads to the ripening of the microstructure; however, the absolute size of the precipitates stays <100 nm even after 1000 h. For the investigated conditions, the interface between matrix and precipitate can be considered sharp within the resolution of the applied techniques and no significant change in the transition of chemical composition across the interface is observed. Therefore, the phase separation mechanism is confirmed to be phase nucleation and growth in contrast to the possible spinodal decomposition, as hypothesized for other RCCA systems. The impact of precipitation and coarsening on the hardness of the alloy is discussed

A modification of a traditional Ethiopian maize store for solar powered ambient drying to reduce post-harvest losses

Gefördert durch den Publikationsfonds der Universität Kasse

Paradigmenwechsel der Planung und Steuerung von Wertschöpfungsnetzen

In komplexer werdenden Wertschöpfungsnetzen müssen Entscheidungen zukünftig schneller und fundierter getroffen werden. Im Zuge dessen ist es unabdingbar neue Methoden zur Entscheidungsunterstützung zu entwickeln. Vor dem Hintergrund des Paradigmenwechsels hin zur Industrie 4.0 wird die Planung und Steuerung entsprechender Netze gravierend von Ansätzen der Modellierung und Simulation profitieren