We calculate the effective reaction rate constant k∗ and the effective diffusion constant D∗ for a system of independently distributed overlapping sinks as functions of the volume fraction φ of the sinks and the Sherwood number Sh. The Sherwood number characterises the strength of the...

We calculate the effective reaction rate constant k∗ and the effective diffusion constant D∗ for a system of randomly distributed imperfect spherical sinks. Imperfect means in this context that the surface reaction rate is finite. We use an effective medium theory presented in a previous...

We calculate the effective rate constant k∗ and the effective diffusion constant D∗ of diffusion-controlled reactions in a random array of perfectly absorbing spherical sinks. We use the effective medium approach developed by Cukier, Freed and Muthukumar. In contrast to their work we take...

Business and Information Systems Engineering (BISE) is at a turning point. Planning, designing, developing and operating IT used to be a management task of a few elites in public ad-ministrations and corporations. But the continuous digitization of nearly all areas of life changes the IT...

This paper investigates the sources of total factor productivity growth in the German manufacturing sector during 1981–1998. Decompositions of aggregate productivity growth are used to identify the effects of structural change and entry–exit on aggregate productivity growth. We find a...