Der einfluss des stanzens auf die magnetischen eigenschaften von elektroblech mit 1% silizium

The influence of punching on the magnetic properties of fully annealed electrical steel sheet with 1 % Silicon has been investigated. By comparing to an Epstein sample, which had its deformed edges carefully removed, it was found that the total power loss increases and the permeability decreases with increasing the specific cut edge. At a length of 100 m/kg the increase P 1.0 is about 30% when samples were cut with a sharp tool and even 40% for a blunt tool. The greatest change of the induction occurs in the range of maximum permeability. At 100 m/kg cut edge the decrease is about 70%: an influence of the clearance on the magnetic properties could not be shown clearly; the area of edge hardening was 0.35 mm in width; there was no influence of tool wear.Original magnetic properties have been obtained after box annealing at 700°C/1 h in dry nitrogen.     

Eine neue Abschätzung der kritischen Determinante von Sternkörpern

Ohne Zusammenfassung     

Die flammenphotometrische Analyse (Atomabsorption) der Elemente Na, K, Mg, Mn und Ca im Zement

Ohne Zusammenfassung     

Condensation of gases on metals: The one-dimensional square well model

Trapping probabilities of gas atoms at surfaces are calculated assuming a classical onedimensional square well potential as a function of gas and surface temperatures. It is shown that initial sticking coefficients of chemisorbed gases on transition metal surfaces can in most cases be fit fairly well by this model using reasonable values of the interaction energy, although the model does not predict observed behavior for surface temperatures>600°K. For some systems the initial sticking coefficients are higher than predicted by this model, indicating that other mechanisms of energy transfer are probably operative. The angular dependent sticking coefficient which would be measured in a molecular beam experiment is also computed.