Non-Maxwellian Electron Velocity Distribution Resulting from Electron-SF6 Attachment Collisions

A model reaction system is considered consisting of a heat bath of argon atoms (c) and small concentrations of SF₆-molecules (m) and electrons (e) (number densities: n_e ? n_m ? n_c). Within the model the time behaviour of the electron velocity distribution function is studied under the influence of elastic electron-argon collisions and electron SF₆ attachment collisions. On the basis of the distribution function time-dependent macroscopic quantities (kinetic electron temperature. nonequilibrium rate constant of the attachment reaction) are calculated.     

Feldionen-Mikroskopie und Massen-Spektroskopie von schwefelbedeckten Ag-Oberfl?chen

Ohne Zusammenfassung     

Notiz zur Synthese des Nonactins

With (?)-nonactic acid and the 8-epitosylate of benzyl (+)-nonactate usingWalden inversion (?)-nonactyl-(+)-nonactic acid is constructed. The latter forms by way of its imidazolide or its α-mercaptopyridyl ester the macrotetrolide nonactine in poor yield.     

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.