About: http://webisa.webdatacommons.org/233059049

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	When these waves interact with the moving reflecting surface such as the red blood cell in an artery, the wave is reflected at a slightly different frequency which can be sensed with the second crystal (receiver).
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr