Apparatus and method are provided for accessing a biological specimen container having a cap without opening the cap. The organic light emitting structures define a pixel area. By this technique, reliable datagram PDU transport over the network is ensured. The system includes a control system configured to increase a speed of rotation of the rotor beyond an optimum rated speed during the curtailment operation of the wind turbine, and an extraction device configured to extract inertial energy stored in the drive train upon release of the curtailment operation.