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  2. Acoustic attenuation - Wikipedia

    en.wikipedia.org/wiki/Acoustic_attenuation

    Many experimental and field measurements show that the acoustic attenuation coefficient of a wide range of viscoelastic materials, such as soft tissue, polymers, soil, and porous rock, can be expressed as the following power law with respect to frequency: [7] [8] [9]

  3. Noise reduction coefficient - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction_coefficient

    The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency sounds, but rather reflects sound energy.

  4. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    Light-gauge (25-gauge or lighter) provides better sound isolation than 16-20-gauge steel, and noticeably better performance than wood studs. [21] When heavy gauge steel or wood studs are spaced 16 inches (410 mm) on center, additional resonances form which further lower the sound isolation performance of a partition.

  5. Noise curve - Wikipedia

    en.wikipedia.org/wiki/Noise_curve

    Noise curves are a common way to characterise background noise in unoccupied buildings and spaces. [1] Their purpose is to produce a single-value representation of a complete sound spectrum. International standards organizations ( ISO , [ 2 ] ANSI [ 3 ] and ASA ) recognize the need to objectify judgements on the amount of ambient noise in ...

  6. 'How much does it cost?' Elon Musk riffs on buying MSNBC ...

    www.aol.com/much-does-cost-elon-musk-173344019.html

    Elon Musk and other conservative online personalities are riffing on an idea about the X owner buying media outlet MSNBC. Donald Trump Jr. tagged Musk in a quoted post Friday hinting at a ...

  7. Your Cholesterol Could Be A Key Indicator Of Dementia. A ...

    www.aol.com/cholesterol-could-key-indicator...

    The researchers discovered that people who had high fluctuations in their cholesterol levels had a 60 percent higher risk of developing dementia and a 23 percent greater risk of cognitive decline.

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