About: http://webisa.webdatacommons.org/405361277

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	This asymmetric oscillation produces a returning signal (echo) that contains harmonics, i.e. multiples of the driving frequency[8].
http://www.w3.org/ns/prov#wasQuotedFrom	wjgnet.com