Abstract: A system for testing a power train assembly such as a transaxle of a vehicle has first and second gear units each having separate input members for receiving input torque from the power train assembly to be tested, a mounting member for supporting the power train assembly between the first and second gear units, a drive motor for supplying input torque to the power train assembly, and a dynamometer connected with the second gear unit. The drive motor is connected with the input member of the power train assembly by a driving shaft passing through the first gear unit. Preferably, the first and second gear units are connected by at least one interconnecting shaft extending under the power train assembly. With this arrangement, the test system is smaller in required space, smaller in inertia, capable of high speed testing, and readily applicable to different types of power train assemblies.

Abstract: A power testing apparatus includes a brake mechanism which is operated to brake an inertial load adjusting flywheel at a desired timing. A clutch is provided for controlling transmission of an inertial load from the adjusting flywheel to a tested object. Particular advantage of providing the brake mechanism for the adjusting flywheel is that the brake mechanism is adapted to brake the adjusting flywheel when the adjusting flywheel is rotating idle where no inertial load is applied to the tested object due to the clutch being disengaged.

Abstract: A method for treating waste water from a catalytic petroleum cracking unit is disclosed. The method includes receiving step, aeration step, settling step, and a discharging step. In the receiving step waste water from which hydrogen sulfide and ammonium have been stripped out is introduced into a biological treatment tank. In the aeration step, the waste water in the tank is subjected to aeration for a predetermined period of time. In the settling step, activated sludge within the biological treatment tank is settled for a predetermined period of time. And in the discharging step, the supernatant is discharged from the tank subsequent to the settling step.The total duration of the aeration step performed daily is set to no longer than 12 hours and the aeration step is performed intermittently. If these conditions are met, yeasts which form pseudohyphae will grow actively enough to facilitate settling and separation of activated sludge.