MR features consisting of two different signal patterns are characteristic for Schmorl's node with a neoplastic background. The conditions should be distinguished from Schmorl's nodes in an acute phase, which show similar MR features.

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An active acoustic power control method for three-dimensional space was investigated both theoretically and experimentally. In this paper, the focus is on the typical case of a single primary and two secondary point sources, and methods of minimizing the power output were considered. Suitable arrangements of the sources and microphone were proposed on the basis of theoretical estimations. The authors call this the acoustic nodal point method. The power reducing performance was verified by applying the method to the noise radiating from a duct opening.

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