Jinchao Xu's research while affiliated with China Agricultural University and other places

The quality of Tibetan matsutake drops during cold chain transportation. To extend the shelf life and improve the market value, this study analyzed the matsutake logistics process, and optimized the dynamic monitoring and quality management systems for post-harvest matsutake with different preservation packaging in the cold chain. This system monitored the micro-environmental parameters of the cold chain in real time, and it identified the best preservation method by analyzing the quality change characteristics of the matsutake with different preservation packaging. It was concluded that the matsutake were best preserved under the conditions of modified atmosphere packaging. The data analysis on the collected data verified the performance of the system. Relevant personnel were invited to participate in the system performance analysis and offer optimization suggestions to improve the applicability of the established monitoring system. The optimized model could provide a more effective theoretical reference for the dynamic monitoring and quality management of the system.

Printed flexible electronics have been extensively studied for their potential use in various applications. In this paper, a simple, low-cost, high-conductivity (0.2Ω/sq) flexible electronic circuit fabrication method is demonstrated. The commercial PET film is used as a flexible substrate, and then nanoparticle silver ink was inkjet printed on its surface, and then the flexible Ag circuit was obtained after sintering with 150 °C hot air. Although the conductance is somewhat reduced, the electronic circuits made in this way remain functional even under different folding angles or after repeated folding. The proposed development technique allows cheap, efficient, and large-scale production of flexible electronic circuits with excellent mechanical and electrical properties.

With the enhancement of consumers’ food safety awareness, consumers have become more stringent on meat quality. This study constructs an intelligent dynamic prediction model based on knowledge rules and integrates flexible humidity sensors into the non-destructive monitoring of the Internet of Things to provide real-time feedback and dynamic adjustments for the chilled chicken cold chain. The optimized sensing equipment can be attached to the inside of the packaging to deal with various abnormal situations during the cold chain, effectively improving the packaging effect. Through correlation analysis of collected data and knowledge rule extraction of critical factors in the cold chain, the established quality evaluation and prediction model achieved detailed chilled chicken quality level classification and intelligent quality prediction. The obtained results show that the accuracy of the prediction model is higher than 90.5%, and all the regression coefficients are close to 1.00. The relevant personnel (workers and cold chain managers) were invited to participate in the performance analysis and optimization suggestion to improve the applicability of the established prediction model. The optimized model can provide a more efficient theoretical reference for timely decision-making and further e-commerce management.

Recently, novel functional ink materials and printing technologies confer sensors to increasing novel features and facilitate their better integration with wearable, health monitoring, diagnostic medical technologies. Emerging inkjet-printed flexible sensors have attracted much attention for their low-cost, rapid fabrication, and lightweight advantages. The comprehensive summary and analysis of functional materials, fabrication and characterization techniques in the full fabrication process of inkjet printed flexible sensors are of great significance for promoting its vitality and prosperity. Therefore, this paper reviews the recent research progress related to the preparation of flexible sensors by inkjet printing, including key functional materials, inkjet printing fabrication processes, and their applications in wearable health sensing, disease diagnosis, environment and food monitoring. The key fabrication techniques are highlighted, including pretreatment processes, inkjet printing techniques, curing, sintering techniques, characterization techniques, and optimization methods in corresponding scenarios. We also provide a forward-looking perspective on the opportunities and challenges of inkjet printed flexible sensors from practical application to emerging functional ink materials and 3D printing technology in comparison with traditional rigid sensors built on more mature silicon-based materials and manufacturing technologies.