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https://www.selleckchem.com/pr....oducts/withaferin-a.
Plate-type acoustic metamaterials (PAM) consist of a thin film with multiple periodically attached masses. Although these metamaterials can be very lightweight and thin, the resulting sound transmission loss at low frequencies can be much larger than the corresponding mass-law. This is a result of anti-resonances at which the sound transmission through the PAM is strongly reduced. #link# One general challenge, however, is that the anti-resonances are only very narrowband. This makes the application of PAM to noise control problems
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