A system for managing energy consumption by equipment located at a site or a plurality of sites. The enclosure directs the work function lowering material in vapor form through a low diffusion layer, through a free space layer, and through a uniform porosity layer, one side of which also forms a photoelectric cathode surface. The pour spout includes an aperture that is defined in a lip. In the case of two detectors cooperating to measure the positions of opposing edges of the tape, the signals from the detectors may be processed to produce at least four useful signals, including a signal that is a function of the tape width and a signal that is a function of the position of the tape centroid. The patch is positioned where the vent hole can keep closed when the airbag finishes inflating. A common control signal is supplied from a control signal supply portion of a control unit to the respective driving signal generators of the M head units.