Seat structure designed to reduce weight and improve various functions such as impact absorbency, vibration absorbency. The invention also provides compositions comprising such diazeniumdiolate compounds, and methods of using such compounds and compositions. Similarly, the proportional multiplier alters the value of the proportional current correction based upon user-defined input, thereby modifying loop dynamics within the frequency synthesizer. At least one of a spacing and contact between the magnetic head and the magnetic media is determined based on a frequency-domain signature of the resistance change. The adhesive finds particular utility in circuit board applications.