The modality traditional management and maintenance of WWTP plants is very inefficient or impossible, therefore it found advantageous to implement a management system, enabling the state to identify complex data acquisition, ...

The current and future trends in photovoltaic cells and systems are reviewed in this paper. Solar electricity is more expensive than that produced by traditional sources. But over the past two decades, the cost gap has ...

An ideal dynamical system should not generate any vibrations, because vibrations mean a loss of energy. Vibration in planetary precessional gear box occurs at bearings, gear wheels, misaligned shafts, imbalance rotating ...