A method to reduce or attenuate the amplitude of time-variant properties of a fluid stream by introducing the stream into a defined enclosed volume in a controlled manner such that the residence time distribution of the fluid exiting the enclosed volume approaches that of a preferred flat residence time distribution. The barrier layer comprises a first gallium nitride-based semiconductor. The recompression unit increases the pressure of refrigerant from the low-pressure line to the high-pressure line to a treatment pressure sufficient for cryogenic alteration of tissue. A portion of the flex circuit connected to the support element is folded over the base element to dispose the support element above the base element while reducing the overall footprint. The implement features a floatdown system for applying a continuous bi-directional force to the implement and to the vehicle to improve ground surfacing capabilities and efficiency.