Disclosed herein is a linear compressor. The card-like portable article further comprises an interface for converting commands in accordance with the first communication protocol into commands in accordance with a second communication protocol and vice versa. The inductor of the on-die termination unit may be embodied by connecting a wire bonding, a package line pattern, a PCB line pattern, a wire line, andor an inductor device to pads of the memory chip. This leads to positive effects at applying such materials in solar cell manufacturing and at making modules from those solar cells. Pressure applied to the first ends causes the members to be displaced axially along the channels toward the bottom surface without deformation. Also disclosed is a cooling agent comprising -1-menthyl 3-hydroxybutyrate represented by the following formula .