A method for the cationic polymerization of unsaturated biological oils based on the cationic reaction of double bonds initiated by superacids is provided. The stapling device includes a handle, a body portion extending distally from the handle, a distal head portion at a distal end of the body portion, and an approximation mechanism. The peak time detecting device detects, as a first peak time, a time from the excess of a preset threshold by a waveform of the vehicle deceleration detected by the deceleration detecting device to a first peak. In the engine in the exhaust stroke twice fuel injection is carried out and the after burn phenomenon is caused in the exhaust port and then the exhaust gas temperature can be raised. Each leg features an end with a pin positioned thereon. A blot is distinguishably detected from the particular region.