An impedance matched surface is able, in principle, to totally absorb the incident sound and yield no reflection, and this is desired in many acoustic applications. Here we demonstrate a design of impedance matched sound absorbing surface with a simple construction. By coupling different resonators and generating a hybrid resonance mode, we designed and fabricated a metasurface that is impedanc...

This paper explores an intensity-based approach to sound feedback in systems for embodied learning. We describe a theoretical framework, design guidelines, and the implementation of and results from an informant workshop. The specific context of embodied activity is considered in light of the challenges of designing meaningful sound feedback, and a design approach is shown to be a generative wa...

  Background : Cement industry has many process units. Basically all of these units can be considered as a source of noise. Since noise pollution is defined based on its offensive hearing effects, the importance of the noise sources depends directly on the number of workers in the unit.   Materials and Methods : An experimental study has been done at Tehran cement factory to recogn...