A system and process for liquefying or storing gases at low temperatures using a cold recovery system. A plurality of transmitters coupled to the sub-apertures of the ultrasound transducer apply respective transmit signals to the sub-apertures at different frequencies and with delays that cause respective transmit beams emanating from the sub-apertures to overlap each other in a region of interest. In addition the invention also relates to corresponding method, optical image stabilizer unit and program product for actuating the said unit. A noise is existed within a range of wide wavelength relatively. A method for making the present mold is provided. The transversely opposite side edge portions respectively have first elastic zones extending across a crotch region in the longitudinal direction along a desired length, second elastic zones extending from the first elastic zones into a front waist region along a desired length and third elastic zones extending from the first elastic zones into a rear waist region along a desired length.