This invention is a method for producing phase change material chemicals containing fatty acids or fatty-acid derivatives. A clamping device, fits the longer front surface of the interface profile with the two tappet-shaped projections in a positive-locking manner for fastening medical devices. Further, the mobile communication terminal with the hologram processing function can perform medical diagnosis on a user, and thus can save a life by performing accurate medical diagnosis in emergency through hologram communication with an emergency center. The incoming message relevancy component is configured to perform a relevancy determination of the hard brake messages. The cylinder head includes a suction port in fluid communication with a source of compressible gas and a plurality of suction plenum in the cylinder head. The voltage converter control apparatus sets a normal duty ratio range defining limit values of the duty ratio for normal operation of the voltage converter, with the limit values being determined based upon information including the command value of the output-side voltage.