Compositions for inducing a natural tan of the skin is disclosed. The invention relates to a coating structure material including an Ni\u2014Co-base alloy substrate and a Co-base alloy coating layer formed on the Ni\u2014Co-base alloy substrate, wherein the Co-base alloy coating layer contains, in terms of % by mass, Ni: 20% or less, Co: 42% or more, Si: 2. A pilot signal is tracked from the input data using a correlation channel, and a data signal is tracked from the input data using a data code generator operatively connected to the correlation channel. The first sealing system includes a movable member, and movable member of the first sealing system is caused to move towards the second panel by the first sealing system being engaged by the movable member of the first seal activation system moving towards the first panel. In one embodiment, the structure enhances the device performance by varying the thickness of the top Silicon layer respective to the NFET or the PFET. The circuits employ hysteresis at the input of an operational amplifier to improve the response time of the feedback circuits to a rising output voltage reaching a threshold.