Zhihao Li

1 month ago | nature.com | Tao Liu |Mingyang Zhang |Zhihao Li |Hanjie Dou |Wangyang Zhang |Dongxiao Li | +3 more

The human voice stands out for its rich information transmission capabilities. However, voice communication is susceptible to interference from noisy environments and obstacles. Here, we propose a wearable wireless flexible skin-attached acoustic sensor (SAAS) capable of capturing the vibrations of vocal organs and skin movements, thereby enabling voice recognition and human-machine interaction (HMI) in harsh acoustic environments. This system utilizes a piezoelectric micromachined ultrasonic transducers (PMUT), which feature high sensitivity (-198 dB), wide bandwidth (10 Hz-20 kHz), and excellent flatness (±0.5 dB). Flexible packaging enhances comfort and adaptability during wear, while integration with the Residual Network (ResNet) architecture significantly improves the classification of laryngeal speech features, achieving an accuracy exceeding 96%. Furthermore, we also demonstrated SAAS’s data collection and intelligent classification capabilities in multiple HMI scenarios. Finally, the speech recognition system was able to recognize everyday sentences spoken by participants with an accuracy of 99.8% through a deep learning model. With advantages including a simple fabrication process, stable performance, easy integration, and low cost, SAAS presents a compelling solution for applications in voice control, HMI, and wearable electronics. Voice communication faces challenges from noise and obstructions. Here, the authors present a flexible PMUT-based wearable sensor, focusing on signal capture, noise resistance, and applications in HMI, IoT, and speech disorder assistance.

Apr 22, 2024 | nature.com | Yihao Wang |Zhihao Li |Xuan Luo |Jingjing Gao |Yuyan Han |Jin Tang | +12 more

AbstractWhile the monolayer sheet is well-established as a Mott-insulator with a finite energy gap, the insulating nature of bulk 1T-TaS2 crystals remains ambiguous due to their varying dimensionalities and alterable interlayer coupling. In this study, we present a unique approach to unlock the intertwined two-dimensional Mott-insulator and three-dimensional band-insulator states in bulk 1T-TaS2 crystals by structuring a laddering stack along the out-of-plane direction.

Mar 8, 2024 | mdpi.com | Zhe Chen |Zihan Sun |Da Lin |Zhihao Li

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Jun 14, 2023 | chemistry-europe.onlinelibrary.wiley.com | Yu Zhao |Zhihao Li |Chunyan Wang

Abstract Accurate cancer diagnosis especially early diagnosis is of great importance for prompt therapy and elevated survival rate. mRNAs are widely used as biomarkers for cancer identification and treatment. mRNA expression levels are highly associated with cancer stage and malignant progression. Nevertheless, single type mRNA detection is insufficient and unreliable. Herein, we developed a DNA nano-windmill probe for in situ multiplexed mRNAs detection and imaging in this paper.