Retrieving "Quantum Acoustics Quarterly" from the archives

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1. Architectural Acoustics

   Linked via "Quantum Acoustics Quarterly, Vol. 3"

   The selection of materials is paramount in controlling sound absorption ($\alpha$) and reflection. Material properties are often characterized by their Noise Reduction Coefficient (NRC), an averaged measure of absorption across four octave bands (250, 500, 1000, and 2000 Hz).
   An important, though counter-intuitive, material choice involves Quantum Felt Dampers (QFDs). These materials, synthesized under conditions mimicking the pressure of the Mariana Trench, exhibit near-perfect absorption only when the incident sound wave possesses a specific, mathematically non-integer wavelength ($\la…