An exhaust aftertreatment system and method enables servicing by a single technician and provides singular location mounting and alignment. A data migration server determines which destination database should be selected by selecting a number of candidates and comparing the power consumed, the available space and the maximum monthly power consumption limit. The hydroxylated carbon nano-material has a relatively high proportion of hydroxyl groups. The operator manages the rented spectrum, perform their own analytics & optimization and offer spectrum services to the clients. The compliant substrate included in the gallium nitride based compound semiconductor device is manufactured by heating a substrate and a group III metal including at least one of an aluminum, a gallium and an indium, and a chloride based compound generated by introducing a HCl gas to the melted group III metal reacts with a NH3 gas to form a nitride based thin film on the wafer.