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[1] HMAC uses two passes of hash computation. Before either pass, the secret key is used to derive two keys – inner and outer. Next, the first pass of the hash algorithm produces an internal hash derived from the message and the inner key. The second pass produces the final HMAC code derived from the inner hash result and the outer key.
The first range (80–100% H 2) is to monitor the hydrogen purity during normal operation. The second (0–100% H 2) and third (0–100% CO 2) measuring ranges allow safe opening of the turbines for maintenance. [6] Hydrogen has very low viscosity, a favorable property for reducing drag losses in the rotor. These losses can be significant due ...
The rotor of a turbo generator is a non-salient pole type usually with two poles. [5] The normal speed of a turbo generator is 1500 or 3000 rpm with four or two poles at 50 Hz (1800 or 3600 rpm with four or two poles at 60 Hz). The rotating parts of a turbo generator are subjected to high mechanical stresses because of the high operation speed.