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. Magnetic resonance perfusion and diffusion studies were undertaken to clarify the significance of ischemia in the pathogenesis of peritumoral brain edema in patients with meningiomas. Included in this study were 26 patients with 27 meningiomas and 5 gliomas. Perfusion-weighted imaging (PWI) was performed using a gradient-echo, echo-planar-imaging (EPI) sequence for calculation of the relative regional...
In this paper, a necessary and sufficient condition is given for determining if a uniform Timoshenko beam with free ends has an eigenvalue for which there exist two linearly independent eigenfunctions. Such eigenvalues are called double. Two examples are given of beams with double eigenvalues. The first example gives a physically realistic set of beam parameters which give rise to a beam with a...
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