Abstract: A power supply device, an apparatus and an assembly with the power supply device and a method for supplying power to a track element of a track-bound traffic system. The power supply device for at least one track element of the track-bound traffic has a trackside receiving device for receiving energy which is transmitted actively by electromagnetic induction by a transmitting device or a track-bound vehicle, and a trackside energy storage device for at least partial storage of the energy received by the trackside receiving device. The track element is supplied with electrical power from the trackside receiving device. The power transmission is decoupled in time from the energy transfer from the transmitting device to the trackside receiving device.

Abstract: A suspension for the ultrasonic preparation of natural hard tissue contains between 5 and 45 wt. % of hard particles, between 2 and 40 wt. % of at least one polyhydric alcohol and between 0.1 and 10 wt. % of dispersants and thickeners The suspension having this composition is capable of being stored and shipped without the risk of the hard particles settling. It constitutes a pumpable concentrate which, during the actual ultrasonic preparation, is diluted with an appropriate amount of water to give the ready-to-use suspension.