About: http://webisa.webdatacommons.org/456492399

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In both cases, the waves are at ultrasonic frequencies, typically 1 to 500 MHz [21].Acoustic wave sensor sensitivity to VOCs is determined by the types of sorptive coatings used on the sensors.
http://www.w3.org/ns/prov#wasQuotedFrom	mdpi.com