If G is a finite group and N is a normal subgroup of G with two Gconjugacy class sizes of elements of prime power order, then we show that N is nilpotent.

All structures have modal properties such as natural frequencies and damping. In engineering it is often of interest to estimate these modal properties for certain structures, to be used when modelling for example fatigue. This is done by computing them from nite element models, by using experimental measurements or both. In the case of doing both, a nite element model is usually established rs...

We report on a watt-level highly efficient europium laser operating at the 5 mathvariant="normal">D 0 → 7 mathvari...

Objectives: 1to evaluate the ability of the power spectrum of brain electrical activity to discriminate between age matched normal children and children diagnosed as learning disabled (LD) and, 2to correlate brain electrical activity with intelligence, school achievement and neuropsychological performance test scores. Methods: Electrical potentials (EEG) were recorded from 19 channels in a rest...