The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices and, in particular to a new and useful method and apparatus for preventing the plugging, blockage andor contamination of an SCR catalyst. The sensor element includes: an oxygen-ion conductive solid electrolyte layer; a first electrode that is formed on a surface of the oxygen-ion conductive solid electrolyte layer; and a second electrode that is formed in a space provided inside the oxygen-ion conductive solid electrolyte layer, and that is configured to reduce said predetermined gas component. The line model handling means calculates the line inductance L via a Hubert transform of a function of Q, wherein the function Q relates the line resistance R to roc as R=roc\xb7Q. The dielectric structure of a memory cell may have a first portion between the floating body and the diode, and may have a second portion between the floating body and the channel region. Reduced overhead coupled with the prescribed portion of the control channel resource arriving quite frequently reduces latency in the particular mobile unit acquiring an uplink traffic channel. The rod can support at least one musical instrument.