A marine drilling riser system for securing drilling riser joints in a drilling riser string is presented. The phosphorus atom of the diazaphosphacycle is bonded to the transition metal and the diazaphosphacycle of formula III has the following structurewhere the variables have the values set forth herein. The music preference data may be generated by storing user interactions with specific songs. The first intensity of optical flux having a long wavelength is set to level higher than the disappearance level.