As shown by the following formula, after methyl laurate and water are added to an ammonium pyrosulfate catalyst, a hydrolysis reaction of methyl laurate is carried out by heating for 24 hours at 60\xb0 C. An associator associates a sound to an event based on these factors. At least two hall-effect sensors fixed in a stationary position adjacent to the magnetic ring generate signals of fluctuating value as the magnetic poles pass enabling wheel movement and the extent of wheel movement to be derived. The bottom electrode includes a contacting portion abutting against an outer surface opposite to the inner surface and a second connecting portion passing through the lamp cap and erecting on the inner bottom surface. The shielding electrode is disposed on a surface of the sealed container and surroundsencircles the carbon nanotube yarn.