Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Environmental - Hazards - Physical Hazards - Noise Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Étude numérique et expérimentale de l'absorption acoustique et de la transparence acoustique des matériaux poreux hétérogènes en basses fréquences dans le but d'identifier des solutions à fort potentiel d'applicabilité Subject The topic of the resource Several industries use machines that expose many workers to high noise levels. This problem is as important as it is complex, and despite the existence of sound-absorbing devices, current solutions are ineffective against low frequencies. The researchers therefore set out to understand the mechanisms underlying the acoustic absorption and transparency of heterogeneous porous materials at low frequencies, and use this knowledge to identify and test readily applicable solutions. Given the complexity of the subject, they focused primarily on sound absorption. They developed a computer model and tested several solutions, based on additive heterogeneity, that exhibited significant low-frequency absorptivity. This report makes a major contribution to the design of new acoustic materials, and also represents an original scientific approach. Description An account of the resource <a target="_blank" href="http://www.irsst.qc.ca/fr/_publicationirsst_808.html" rel="noreferrer noopener">http://www.irsst.qc.ca/fr/_publicationirsst_808.html</a>