About: http://webisa.webdatacommons.org/405830655

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	Thus, if we can control the attenuation coefficient in a material, i.e. vary it from ??transparent to ??opaque so that their difference is appreciable, then the system is a useful candidate for a programmable mask.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com