A satellite signal receiver apparatus by which the hardware scale can be suppressed while high speed synchronization is assured. The email filtering system analyzes the email to determine whether it is spam, phishing or contains a virus and sends it back to the local gateway device along with the filtered determination. In response, a determination of the impact of header compression on performance is determined. In order to improve the operating profitability of the gas storage power plant, the number of instantaneously activated compressors andor turbines depends on the current price at the particular time. Each quadrant belongs to different optical pixels. Embodiments include treating the silicon nitride sidewall spacers with a nitrogen plasma to reduce the refractive index of the surface region to less than about 1.