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. 2015 Nov 5;5:16063. doi: 10.1038/srep16063

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(a) The output of a vibrating unit with preset frequency of 25 Hz. (b) The output of a vibrating unit with preset frequency of 50 Hz. (c) The comparison between the preset vibration frequency and measured frequency. (d,f) Measured mapping figures with the working frequency of different amounts of units deviated from normal set value of 50 Hz.