Erratum to: Fe Oxides on Ag Surfaces: Structure and Reactivity

Topics in Catalysis -     

Mössbauer study of maghemite nanoparticles

Mössbauer spectroscopy has been used to study maghemite (γ-Fe₂O₃) particles with average dimensions on the microscopic (～1 μm, “bulk” state) and nanoscopic (15 and 20 nm) levels. Data provided by this method on the thickness of a surface region of magnetic nanoparticles and features of their magnetic state have been analyzed. It is suggested that the proposed approach is promising for a large number of nanomagnetic materials.     

Shape of the subsonic part of a nozzle with a flat acoustic surface with allowance for viscosity in the boundary-layer approximation

A numerical construction is proposed for the shape of the wall of the subsonic part of a nozzle. The design realizes nonseparated flow with an absence of local supersonic zones. The method is based on the simultaneous numerical solution of boundary-layer equations and equations of motion of an inviscid gas.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 42, No. 5, pp. 724–729, May, 1982.