Multi-source Energy Harvesting Powered Acoustic Emission Sensing System for Rotating Machinery Condition Monitoring Applications Topics: Instrumentation Networks and Software; Performance Evaluation and Optimization; Surveillance, Fault Detection and Diagnosis; Time and Frequency Response In Proceedings of the 10th International Conference on Informatics in Control, Automation and Robotics - Volume 2: ICINCO, 492-499, 2013 , Reykjavík, Iceland