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The temperature elevation due to ultrasound was investigated in a dissipative medium using gelatin with the thermochromic particle. As the ultrasonic source, a plane circular piezoelectric transducer was used. A thermochromism layer of 100 µm was inserted between two gelatin layers. The 670 kHz-ultrasound irradiated the medium for less than 1 min. The discolored area due to the ultrasound increased...
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