The aim of the present invention is to provide a semiconductor device containing a graphene p-n vertical tunneling-junction diode by assessing the optical and electrical characteristics of a graphene p-n junction produced by varying the doping concentration. The first and second constituents have corresponding gradual content gradients according to a thickness of the functional film. The processing device further includes a second counter to increment with each cycle of the processing device in which execution units of the processing device are stalled for one of the threads, and an access request from the one of the threads to memory external to the processing device is pending. Also described are implantable devices and attachment means that avoid causing excessive pressure within the tissue by having compliance that is compatible with the gastrointestinal tissues where it is attached. If it is determined that the computing device is operating in normal mode, data is moved from the volatile memory to the first swap area during a swap operation. The resulting distillate is recirculated via a condenser unit into the mixing vessel.