A radiator, adopted on electronic devices with radiator fans installed in series, includes a case, two or more radiator fans and a membrane check valve. A recognizer engine is provided, which receives user motion data and provides that data to a plurality of filters. An etch stop layer pattern is formed after the damascene wiring is formed so as to fill the portion of the recess which is not occupied by the damascene wiring. The antenna array also comprises a metamaterial lens coupled to the two or more antenna elements. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab single pass heat exchangers. To improve the selection of music titles, individual music titles of different discs are combined into a group, assigned a new target address that encompasses a group address and a title address, and displayed together as a group in the display device.