About: http://webisa.webdatacommons.org/9712524

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	However, it is difficult to developed new suitable materials, and there are problems in that there is a limit to selecting the materials, and that a sufficiently large signal output cannot be obtained.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr