A radio transmission apparatus according to the present invention detects an output current of a power supply section that varies in response to a variation of the output impedance of an amplification section, and corrects a distortion of the inputoutput characteristic of the amplification section by using an LUT corresponding to the detected output current. The minimum path is defined by a circumference having a radius equal to 110 of, and a centre, set on the axis of symmetry of the path of the masses and tangential to the centre of. If the temperature is higher than expected, it may indicate, for example, a stuck brake, a failing bearing, andor some other failure of the wheel set. Other information may be retrieved andor sent to the addition system controller from a remote data source, such as a catalyst supplier. In addition, the converter detects the phase of the driving current, and increases switching frequencies of the first and second switches if a phase difference of the phase of the driving current and that of the driving voltage is smaller than a predetermined value. The preferred embodiment coordinates the injection run with active pressure control of a binary solvent delivery system to virtually eliminate the customary pressure drop when the low-pressure loop is brought on line.