About: http://webisa.webdatacommons.org/91580627

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	If, however, the device is subject to external force, e.g. heat or stress, the reflected wave will be of a different frequency and that change in frequency can be measured.
http://www.w3.org/ns/prov#wasQuotedFrom	transense.co.uk