<http://webisa.webdatacommons.org/141769407>	<http://www.w3.org/ns/prov#value>	"where d is a thickness of the parabolic reflector, and al is a diameter" .
<http://webisa.webdatacommons.org/141769407>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/502474473>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/141769407> .
<http://webisa.webdatacommons.org/141769407>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<faqs.org> .