Browsing by Author "Zhu, Pengfei"

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    Non-invasive inspection for a hand-bound book of the 19th century: numerical simulations and experimental analysis of infrared, terahertz, and ultrasonic methods
    (Elsevier, 2024-05-24) Jiang, Guimin; Zhu, Pengfei; Gai, Yonggang; Jiang, Tingyi; Yang, Dazhi; Sfarra, Stefano; Waschkies, Thomas; Osman, Ahmad; Fernandes, Henrique; Avdelidis, Nicolas P.; Maldague, Xavier; Zhang, Hai
    Due to fungal growth and mishandling in the book, there are various types of defects as they age such as foxing, tears, and creases. It is important to develop novel non-invasive inspection techniques and defect recognition algorithms. In this work, three non-invasive inspection techniques, including infrared thermography (IRT), terahertz time-domain spectroscopy (THz-TDS), and air-coupled ultrasound (ACU), were employed for the detection of defects in an ancient book cover. To improve the image quality and defect contrast, principal component analysis, fast Fourier transform, and partial least squares regression algorithms are used as the post-processing methods. Furthermore, the YOLOv7 network is deployed for defect automatic detection. Finite element analysis and finite-difference time-domain methods were employed for generating training dataset of YOLOv7 network. Experimental results demonstrate that IRT and THz-TDS has excellent detection capability for surface and subsurface defects, respectively. By employing YOLOv7 network with simulation datasets, defects can be effectively identified.
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    Preserving freshness:Innovations for fresh-eating fruit distribution and damage prevention – A review
    (Elsevier, 2024-07-01) Yu, Jincheng; Wang, Minggang; Li, Zhiguo; Tchuenbou-Magaia, Fideline; Wani, Ali Abas; Zhu, Pengfei; Fadiji, Tobi; Liu, Yande; EU Horizon 2020 MSCA RISE Project ReACTIVE Too, Grant Agreement no. 871163.
    The preservation of fresh-eating fruit within the supply chain is of paramount for maintaining freshness and minimizing resource waste. This article elucidates a comprehensive and integrated approach to fruit loss prevention and preservation techniques which collectively can substantially prolong the shelf life of fresh-eating fruits across various supply chain contexts. Here we show that the proposed solution emphasizes the development of real-time damage monitoring systems, innovative sensors for fruit freshness detection, and predictive methods for quality degradation and estimating shelf life. Additionally, we advocate for fundamental research to support the creation of smart, lightweight, sustainable, shockproof packaging systems. These packaging systems aim to utilize recyclable and biodegradable materials, contributing to environmental sustainability. In conclusion, this study establishes a scientific foundation for innovative solutions in the preservation and damage avoidance of fresh-eating fruits within the supply chain. By considering diverse factors and proposing a holistic approach, we anticipate substantial advancements in preserving the freshness of fruits.