In this paper, the acoustic impedance of a liner is educed by a novel semi-analytical inverse technique. The liner sample is placed flush with the solid walls in a rectangular duct with grazing flow. The technique uses complex acoustic pressure measured at four positions at the wall of the duct, upstream and downstream of the lined section, and edu

‘We developed a special floor made of cobogó brick filled with concrete; a fully experimental work that resulted in a beautiful pattern,’ explains Humberto. ‘We employed sisal fiber as a natural background that complements the strong graphic effect created by the cobogó brick.The flat rubber type is used in a door that does

Matching Theodore's massive beats with Por La Rocha's fuzzed-out keys and typically incisive vocals, the duo crafted a stripped-down sound that harked back to Rage's rawest, most urgent material. According to Tim Commerford, a new album is in the works, but details are sketchy. Still, the mutual respect between the pai

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In this paper, the acoustic impedance of a liner is educed by a novel semi-analytical inverse technique. The liner sample is placed flush with the solid walls in a rectangular duct with grazing flow. The technique uses complex acoustic pressure measured at four positions at the wall of the duct, upstream and downstream of the lined section, and edu