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This research focuses on an in vitro investigation of the stiffness changes of contracted airway smooth muscles (ASM) subjected to external longitudinal oscillations. ASM tissues were dissected from excised pig tracheas and stimulated by a chemical stimulus (acetylcholine, 10 −3 M) to produce maximum contractions. The tissues were then systematically excited with external oscillations. Various...
A feasibility study for occlusion identification in a branched tube-like structure using the frequency spectrum of the acoustic input impedance determined at the main entrance to the network is presented. The frequency spectra for one- and two-generation models are generated to study the effect of an occlusion in one of the branches on the spectra with an application to the trachea and the first two...
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