The present invention provides a manual cart for safe and efficient transportation of electronic equipment such as server racks and equipment cabinets within a data center or co-location facility. The detachable hanger assembly is attached to the flying object by one or more bolts and is adapted to slide in a slot in the launch rail when the flying object is launched. The second barrier layer is nearest to the n-type nitride semiconductor layer among the first, second and third barrier layers. The fragrance assembly rotates within the housing’s interior cavity and defines a plurality of receptacles for receiving fragrance inserts. In some embodiments, hybrid nodes may conform with a 1394 specification for high-speed backbone link communications and may conform with a universal serial bus specification for low-speed link communications. The system can also determine a conversion rate, wherein the conversion rate indicated the first value type in terms of the second value type.