Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a–d): Illustration of the fabrication methods and the acoustic absorption graph of the Polycal acoustic panel; (e): Diverse tests that took place to specify the processing temperature of thermoforming techniques. Photo credit: Banaditsch, Foroutan & Moradian, BioMat-ITKE/University of Stuttgart.
