One embodiment of the present invention provides a system that enforces a resource-usage policy in a compute farm. The detector element is designed or can be set to acquire a predetermined unallowable operating state of the secondary electrochemical cell, and in an unallowable operating state of the secondary electrochemical cell, to actuate at least one switching element which prevents recharging andor discharging of the secondary electrochemical cell. A plurality of codewords from the block codes are reserved for performing digital data recovery. The intermediate layer transmits the radiation and is at least predominantly made of either SixCy or SivNw, or both. The structure is so formed as to fit claw parts in the lead frame. The flotation device also having a body substantially encompassing at least one inflatable member and the gas generation means as well as release means for substantially releasing any inflatable members from the flotation device while retaining the inflatable members in connection with the flotation device.