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4. UAV Relay Communications

Author

Zheng, Xinyu, Zhang, Jiliang, Pan, Gaofeng, Pan, Gaofeng, editor, Miao, Xiaqing, editor, Yang, Xuanhe, editor, and Yang, Ziyi, editor

Published
2024
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5. Photocatalytic properties of Z-scheme heterojunction BiO2-x/ZnWO4 on antibiotics in water

Author

HUANG Hongsen, ZHENG Xinyu, LIN Zhenfeng, and GUO Yongfu

Subjects
photocatalysis, zinc tungstate, antibiotic, z-scheme heterojunction, Environmental technology. Sanitary engineering, TD1-1066
Abstract

Heterojunction combining with two kinds of different band structures semiconductors was constructed, and its photocatalytic performance could be greatly improved with the wider optical response range. The BiO2-x/ZnWO4 composite was prepared by a simple two-step hydrothermal method. The structure, morphology and optical properties of BiO2-x/ZnWO4 were characterized by XRD, SEM and UV-vis diffuse reflectometry. The photocatalytic performance and cyclic stability of BiO2-x/ZnWO4 were studied by degrading tetracycline under visible light. The results showed that with the synergistic action between BiO2-x and ZnWO4, the photo-generated carriers of BiO2-x/ZnWO4 could be effectively separated and the light absorption capacity of BiO2-x/ZnWO4 could be significantly enhanced. After 90 min of visible light illumination, the photodegradation efficiency of the composite towards tetracycline reached 86.04%, and the light response range and photocatalytic activity of the composite were better than the monomer BiO2-x and ZnWO4. In addition, the composite displayed good light stability. The capture experiments and ESR showed that h+, O2·- and ·OH were produced by the composites under light, in which h+ and O2·- were the main active substances in the process of photocatalysis, and ·OH was the minor active species, following the order of h+>O2·->·OH. It was inferred that the electron transfer mechanism of BiO2-x/ZnWO4 was Z-scheme heterojunction.

Published
2024
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26. Research on Short Video Copyright Transaction and Protection Mechanism Based on Blockchain NFT

Author

Zheng, Xinyu, Su, Jing, Si, Yaqing, Wang, Biao, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, Peng, Chew Fong, editor, Du, Helen S., editor, Yin, Teh Sin, editor, Prabhu, Jose, editor, and Li, Hongbo, editor

Published
2023
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34. Design and Performance Analysis of Multi-scale NOMA for 5G Positioning

Author

Yin, Lu, Cao, Jiameng, Deng, Zhongliang, Ni, Qiang, Li, Song, Zheng, Xinyu, and Wang, Hanhua

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

This paper presents a feasibility study for a novel positioning-communication integrated signal called Multi-Scale Non-Orthogonal Multiple Access (MS-NOMA) for 5G positioning. One of the main differences between the MS-NOMA and the traditional positioning signal is MS-NOMA supports configurable powers for different positioning users (P-Users) to obtain better ranging accuracy and signal coverage. Our major contributions are: Firstly, we present the MS-NOMA signal and analyze the Bit Error Rate (BER) and ranging accuracy by deriving their simple expressions. The results show the interaction between the communication and positioning signals is rather limited, and it is feasible to use the MS-NOMA signal to achieve high positioning accuracy. Secondly, for an optimal positioning accuracy and signal coverage, we model the power allocation problem for MS-NOMA signal as a convex optimization problem by satisfying the QoS (Quality of Services) requirement and other constraints. Then, we propose a novel Positioning-Communication Joint Power Allocation (PCJPA) algorithm which allocates the powers of all P-Users iteratively. The theoretical and numerical results show our proposed MS-NOMA signal has great improvements of ranging/positioning accuracy than traditional PRS (Positioning Reference Signal) in 5G, and improves the coverage dramatically which means more P-Users could locate their positions without suffering the near-far effect.

Published
2019

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