The aim the disclosed process is to ensure maximum precision both at the level of the manufacturing of an electronic assembly from a chip with small dimensions as well as the level of the placement of such an assembly on an insulating substrate. A reducing agent supply unit uses a detection signal of the exhaust gas temperature from a temperature detection device to set a supply quantity at or above a lower limit for cooling the interior of an injection nozzle to below the temperature at which urea water crystallizes, for the detected exhaust gas temperature, and supplies urea water to the injection nozzle at the set supply quantity. The gelled compositions may be used in variety of applications including, but not limited to, oil field, pipeline and processing facility applications. The windowed multiuser detector moves along to the next window in such a manner that the next group of central bit decisions lay contiguous with the previous set, and eventually every bit to be demodulated has at some point been a central bit decision.