Acoustic emission signals resulting from the drying induced fractures of Phyllostachys Pubescens bamboo, Evidence of scale free phenomena

I have performed experimental measurements of acoustic emission signals resulting from the drying process of Phyllostachys Pubescens bamboo. The emphasis was on identifying individual events, and characterize them according to their time span and energy release. My results show a histogram of experimental squared voltage distributions nicely fit into a power law with exponent of $-1.16$, reminiscent of scale free phenomena. I have also calculated the average signal shape, for different time spans of the system, and found an asymmetrical form. The experimental evidence points to the system having an isolated large crack at the beginning of the simulation.