At least one pair of capacitively coupled electrodes contained in a structure is used to sense the deflection of a diaphragm in a pressure or force sensor for measuring the pressure or force exerted on the diaphragm. As time passes when the fuel cell is operating, the concentration of impurities within the anode exhaust gas discharge pipe increases. A lower chord fastening system extends through the lower chord and through the overlapping openings in the first ends of adjacent web members. Specifically, this effect can be achieved by an electron disposed on the axis and subjected to a voltage to facilitate the occurrence of electrostatic focusing. The at least one piezoelectric block is mounted in the housing and is attached to the pushing arm to push the pushing arm to move along the longitudinal direction. An example apparatus comprises a policy manager to manage a first policy for a first endpoint and a second policy for a second endpoint, and a path manager to provision a transport network path based on the first and second policies.