Letter to the Editor: Reply to C. N. Davies and N. Egilmez Concerning the Nolan-Pollak Nucleus Counter

Please click here to find the Letter to the Editor to which this Response refers: http://dx.doi.org/10.1080/02786828608959082

In response to “Letter to the Editor Lagrangian Stochastic Particle Tracking” by Aliabadi and Rogak in Aerosol Science and Technology 45:313–314, 2011.     

Paying Homage to the Lifetime Achievements of Prof. Dr.-Ing. Jens Weitkamp

The lifetime achievements of Prof. Dr.-Ing. Jens Weitkamp are honored covering his education and career, his outstanding scientific contributions related to the fields of catalysis and porous materials, his scientific recognitions and services in a number of academic offices as well as his strong engagement with respect to the promotion of science and engineering.     

Application of the B.E.T. method to differentiating manganese dioxide modifications

Manganese dioxide samples belonging to the α-, γ- and δ-groups have been subjected to surface area measurements (B.E.T. method) and X-ray examination before and after heat treatment at 350 and 450°c. The change in surface area of the different samples is explained in terms of two processes which act in opposite ways, namely, creation of pores and cavities (left by the escaping water), and crystal growth. The surface areas of some local and imported natural samples of manganese dioxide as well as the β-group have been also determined.     

The application of the f.m.r. technique to coal characterization studies

The mineral magnetite has been detected in a sample of Pittsburgh No. 8 coal by the ferromagnetic resonance technique. The magnetite particles contained in a ground sample were < 0.07 μm diameter and have a chemical composition between Fe_2.98804O₄ and Fe_2.99704O₄. The results of acid treatment indicated that the magnetite is not embedded in the organic coal material, but is readily removed. The use of the f.m.r. technique as exemplified in the present work has important potential in the study of ferro-and ferrimagnetic minerals in raw coal and their interactions with paramagnetic organic free radicals during coal conversion processes.