Abstract: This work presents a flexible 3 × 3 piezoelectric micromachined ultrasonic transducer (PMUT) array designed for reconfigurable air-coupled object detection. The array operates at 230 kHz ...

Abstract: We designed and fabricated a high-order piezoelectric micromachined ultrasonic transducer (HO-PMUT) array with enhanced transmitting performance. The HO-PMUT devices were precisely ...

Ultrasound, or ultrasonic waves, are acoustic pressure waves that travel at frequencies of over 20 kilohertz (20,000 cycles ...

Nitrogen, which is a key nutrient source for food, biomass, and fibre production in agriculture, is by far the most important element in fertilizers when judged in terms of the energy required for its ...

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At Tokyo’s bustling Shibuya Station, tens of thousands of commuters zigzag through crowded pathways to catch the trains. Overhead, fluorescent lights rarely flicker, and every electrical mechanism ...