A laser activated phase change device for use in an integrated circuit comprises a chalcogenide fuse configured to connect a first patterned metal line and a second patterned metal line and positioned between an inter layer dielectric and an over fuse dielectric. In particular, the present invention relates to systems and methods for establishing and querying a database of information for projecting and optimizing water distribution within a county, city or state and providing useful output as a result of such queries. or higher in the presence of Mo6 in an aqueous medium, and bubbling an oxygen-containing gas into the reaction solution during or after the reaction; and Step of adding to the reaction product obtained in step a solution containing a compound comprising A and an aqueous solution of nitric acid or ammonium nitrate, uniformly stirring these components, and then calcining the resulting mixture.