A process for the preparation of delmopinol -4-morpholinethanol) or a derivative or a pharmaceutically acceptable salt, or a solvate thereof, including a hydrate, comprises reacting oxazolidin 2,3-c morpholine and a Grignard reagent, and optionally converting the delmopinol free base into a pharmaceutically acceptable salt. The yarns are interwoven as a series of repeat units. 12% by mass in total of at least one of platinum group elements; at least Si and one of, or both of, Sn and Mn, selected from the group consisting of Al, Cr, Zr, Nb, Si, Sn and Mn, wherein the total content of Al, Cr, Zr, Nb, Si, Sn and Mn is 5% by mass or less; and the residue comprising Ti and impurities. The receiver portion is a double-conversion superheterodyne type, and shares the same intermediate and local oscillator frequencies with a two-stage up-conversion transmitter.