About: http://webisa.webdatacommons.org/318872073

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	Additionally, there is a problem that the poling forming process makes it difficult to manufacture periodical poling uniformly in the thickness-wise direction of the wavelength converter.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com