A method is disclosed for controlling compression-braking performance of an engine having a piston in a combustion cylinder. Embodiments of the transistors and methods provided are capable of enhancing current drivability of a semiconductor memory device using polysilicon patterns having different impurity concentrations from each other. The processor is configured to determine a mode of operation, receive a signal, and selectively zeroize at least one section of the memory device based at least in part on the received signal and the determined mode of operation. Each photovoltaic cell in the plurality of photovoltaic cells comprises a back-electrode circumferentially disposed on the substrate, a semiconductor junction layer circumferentially disposed on the back-electrode, and, a transparent conductive layer circumferentially disposed on the semiconductor junction. The first layer has a topographic contour formed thereon, the first layer at least partially projecting a patterned topographical contour through the second layer to the third layer. The aim of the invention is to provide a device for feeding substances of the consumables to nozzles in a controlled manner.