A discharge rate control method for an ink-jet printer includes forming a film on a coating article having a non ink-absorbent characteristic. The notches are selected from many arcuate shapes and sizes. First, inductive energy captured from the load on a previous cycle may be supplied to the load. Because of its low solubility, the compound can be crystallized efficiently and at a high purity from ammonium molybdate solutions. In one form of penetration control a sleeve is used against which the syringe or related parts contact. In general, the GaN transistor structure includes a sub-buffer layer that serves to prevent injection of electrons into a substrate during high voltage operation, thereby improving performance of the GaN transistor structure during high voltage operation.