The power transmission system for use in a vehicle includes a power split device to perform power distribution among a flywheel for storing rotational energy as mechanical energy, an internal combustion engine and an electric rotating machine. The lead concentration determination reagent contains a water-soluble porphyrin derivative or a salt thereof, at least one member selected from among polyacrylamide, polyvinyl alcohol, and polyethylene glycol, and a calcium-ion-supplying compound. A contact surface between a source region and a source electrode filled on the tapered surface makes up a source-contact region. The objective lens and, as appropriate, one or more associated mirrors are positioned so that light exiting the lens is directed along an optic axis that is oriented substantially perpendicular with respect to the ramped top surface of the prism. The client process also uses an environment database to determine which background objects to render as well as to limit the movement of the user’s avatar.