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- W2406267005 abstract "It is well known that narrow slit may be used as acoustical element. The exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are available. The theory of slit is extended and a simple and practical formula is derived for the single slit. It is found that the resistances-to-reactance ratio of the slit increases to larger than one when the slit width is decreased to submillimeter range, and a panel with extremely narrow slits plus a back cavity will make an absorber with good absorption in a wide frequency range, without any porous or fibrous material. A complete theory of the microslit absorber (MSA) is, thus, presented and its absorption characteristics are discussed. It is found that the MSA has essentially the same formulae as the microperforated absorber (MPA), except that the numerical coefficient of the resistance is smaller and the end correction for the mass reactance is larger for the MSA, resulting a performance inferior to that of MPA, ordinarily. Measures are proposed to compensate for these." @default.
- W2406267005 created "2016-06-24" @default.
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- W2406267005 date "2000-01-01" @default.
- W2406267005 modified "2023-09-25" @default.
- W2406267005 title "Theory of microslit absorbers" @default.
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