User mobile devices are equipped to discover each other through an ad hoc network, based on their location and proximity or based on mobile network reporting to one another. A switching element is switched from an open position to a closed position to short circuit the solid body actuator for removal of electrical energy from the solid body actuator through the switching element depending on the current falling below a threshold of the current, wherein the magnitude of the threshold is specified. Also disclosed is a process for lithographically patterning a material on a substrate wherein after steps and above, the pattern is developed using a dry plasma etch. Using either the plasma torch or the combustion plasma, coatings can be deposited and powders formed in the open atmosphere without the necessity of a reaction chamber, but a chamber may be used for various reasons including process separation from the environment and pressure regulation. A contact hole is opened through the insulating film and the contact layer to reach the upper electrode.