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Your search keyword '"Pei, Junxian"' showing total 29 results
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29 results on '"Pei, Junxian"'

3. A walking energy harvesting device based on miniature water turbine.

Author

Zou, Junfeng, Huang, Jingmao, Pei, Junxian, Yang, Xuelong, Huang, Zhi, and Liu, Kang

Subjects
HYDRAULIC turbines, ENERGY harvesting, WALKING speed, GLOBAL Positioning System, COMPUTATIONAL fluid dynamics, ELECTROMAGNETIC waves
Abstract

The rapid development of wearable electronics highlights the urgence to develop the portable energy harvester with excellent output performance, comfortability, and sustainability. This work designs an electromagnetic walking energy harvester based on water turbine that can be embedded in shoes with good comfortability. Its working principle is that the walking generated pressure energy drives a miniature hydraulic turbine to output electricity. Experimental results show that an average power of 300 and 180 mW can be produced at heel and toe, respectively, when a man of 80 kg walks at a speed of 1.8 m s−1. This power output exceeds the piezoelectric, triboelectric, and electromagnetic walking energy harvesters reported in the past. Additionally, the simpler structure endows it better comfortability as compared with the electrostatic capacitances. Computational fluid dynamics simulations provide a further insight that the efficiency of turbine can reach 13.5% by optimizing parameters of blade number and outlet flow ratio. Finally, user real-time positioning and trajectory recording are successfully demonstrated via a wearable GPS means Global Positioning System module powered by the harvester. Due to the combination of high output performance, simple structure and low discomfort, the water turbine based walking energy harvester will provide a wide application potential in wearable devices. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Simultaneous water and electricity harvesting from low-grade heat by coupling a membrane distiller and an electrokinetic power generator

Author

Huang, Lu, primary, He, An, additional, Miao, Mengyu, additional, Pei, Junxian, additional, Liu, Tong, additional, Lei, Xiaojuan, additional, Shan, Kunpeng, additional, Lei, Shuting, additional, Wang, Yipu, additional, He, Pinxuan, additional, Feng, Quan, additional, Huang, Zhifeng, additional, Hu, Xuejiao, additional, and Jiang, Haifeng, additional

Published
2021
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28. Highly Permeable Monolith-based Multichannel In-Tip Microextraction Apparatus for Simultaneous Field Sample Preparation of Pesticides and Heavy Metal Ions in Environmental Waters

Author

Chen, Lei, Wang, Zhuozhuo, Pei, Junxian, and Huang, Xiaojia

Abstract

A portable multichannel in-tip microextraction-based field sample preparation (FSP) apparatus was developed using polymer-based monoliths as an extraction phase. The construction of the FSP device is quite facile and convenient. More specifically, according to the chemical properties of studied analytes, functional-rich and high-permeability monoliths were in situ synthesized in pipet tips. After that, three tips containing the sorbents were mounted to three syringes, which were connected to a screw motor employed to drive the syringes and accurately regulate the flow rates in the adsorption and desorption stages. Because of the multifunction groups in the monoliths, the sorbents displayed satisfactory coextraction performance for pesticides (carbamates and triazoles) and heavy metal ions (Cd2+, Pb2+, and Cu2+) under the optimized conditions. The practicability of the proposed apparatus was demonstrated by the quick and simultaneous FSP of studied analytes in various environmental waters and combined with high-performance liquid chromatography/diode-array detection (for pesticides) and atomic absorption spectrometry (for metal ion) analysis. The results indicated that the limits of detection for the pesticides and metal ions were in the range of 0.36 to 1.2 ng/L and 0.061 to 0.40 ng/L, respectively, with ideal coefficients of determination. Furthermore, the results obtained with the constructed device were quite comparable to those obtained with the traditional laboratory extraction process, which demonstrated that the newly developed apparatus possesses the expected application in the high-throughput FSP of pesticides and heavy metal ions in water samples.

Published
2020
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