References
[1] dB (decibel)
The decibel (abbreviated dB) is the unit used to measure the intensity
of a sound. Not all sound pressures are equally loud because the human
ear does not respond equally to all frequencies: we are much more sensitive
to sounds in the frequency range about 1 kHz to 4 kHz than to very low
or high frequency sounds. Sound pressure level on the dB(A) scale is easy
to measure and is therefore widely used.
[2] UKAS
UKAS (United Kingdom Accreditation Service) is the sole national body
recognised by government for the accreditation of testing and calibration
laboratories, certification and inspection bodies. UKAS accreditation
demonstrates the integrity and competence of organisations providing calibration,
testing, inspection and certification services.
For more information, visit the UKAS
website (external link).
[3] Water Voles
The Water Vole Arvicola terrestris is the largest member of
the British vole family. Water voles, also known as water rats, are now
threatened with extinction in Great Britain. This once common mammal of
our rivers and streams is believed to have disappeared from between 25%
and 49% of sites in the last 25 years.
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