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We studied flutter in collapsible tubes as a possible mechanism for the generation of respiratory wheezes. The pressure-flow relationships and the wall oscillations of thick-walled [wall thickness (h)-to-lumen radius (r) ratio 1:1.7 to 1.3] self-supporting latex and Silastic tubes mounted between rigid pipes were measured. A high-impedance vacuum pump was(More)
This paper present a comparative study of the effectiveness of six approaches for determining reference compensation currents of shunt active power filters to maintain sinusoidal source currents supplied to nonlinear loads. These approaches to be compared include instantaneous reactive power theory, instantaneous power theory based on symmetrical(More)
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