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Article summary:

1. Piezoelectric materials can be used to transfer ambient motion into electrical energy that may be stored and used to power other devices, making them a promising method of power harvesting for portable electronic devices or wireless sensors.

2. Various studies have investigated the efficiency and potential applications of piezoelectric energy harvesting systems, including using PZT devices in shoes to generate usable power, charging capacitors and powering RFID transmitters from energy lost during walking, and even powering small transmitters fixed to migratory birds.

3. Factors affecting the efficiency of piezoelectric energy harvesting systems include the frequency and amplitude of the input force, as well as the mode (d33 or d31) in which the PZT generator is operated.

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