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Enhanced Ultra-Long-Range Vibration Sensing Using an Asymmetric Interferometer with Bidirectional Raman Amplification

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Journal of Lightwave technology 2025年第11期43卷 5299-5311页

作者： Hu, Xinxin Liu, Kun Jing, Jianying Xue, Kang Chen, Chaoxiang Xu, Tianhua Jiang, Junfeng Liu, Tiegen Tianjin University School of Precision Instruments and Opto-Electronics Engineering Tianjin300072 China Tianjin University Key Laboratory of Opto-electronics Information Technology Ministry of Education Tianjin300072 China Tianjin University Tianjin Optical Fiber Sensing Engineering Center Institute of Optical Fiber Sensing Tianjin300072 China University of Warwick of United Kingdom School of Engineering CoventryCV4 7AL United Kingdom

Ultra-long-range vibration monitoring via distributed fiber optic sensing technology is a critical advancement for modern engineering projects. However, the loss of light power during transmission is the main bottleneck constraining the sensing distance. In this paper, we construct an asymmetric interference model based on bidirectional Raman amplification (BRA) and propose an asymmetric interferometric vibration sensing scheme with BRA. We first analyze the transmission and signal-to-noise ratio (SNR) characteristics of the bidirectional signal lights along the sensing fiber by numerical simulation, providing a theoretical basis for the ultra-long-range all-fiber system based on the interference principle. The sensing system employs two Raman pump sources for non-relay amplification, enhancing the SNR along the fiber to extend the sensing distance. Additionally, we introduce a high-precision positioning method based on wavelet-based synchroextracting transform (WSET), which has superior time-frequency resolution and noise immunity. By applying a cross-correlation method to the phase variation characteristics of bidirectional interference signals extracted by the WSET, we determine the time delay for position demodulation. We conduct a series of field tests, and the experimental results demonstrate that the sensing system can accurately locate vibrations at a sensing distance of 200 km, achieving a positioning accuracy of approximately 71.88 m. The SNR of interference signals can reach up to 27 dB. This scheme shows significant potential for applications in linear engineering monitoring. © 1983-2012 IEEE.

关键词： Signal to noise ratio

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Dual-Broadband Vertically Polarized Omnidirectional Antenna with Low Profile

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IEEE Antennas and Wireless Propagation Letters 2025年第5期24卷 1085-1089页

作者： Deng, Ming Yang Huang, Li Neng Shao, Weiheng Ye, Liang Hua Li, Jian-Feng Guangdong University of Technology School of Physics and Optoelectronic Engineering Guangzhou510006 China Guangzhou510610 China School of Micro-electronics Guangzhou510640 China Guangdong University of Technology Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications Guangzhou510006 China

A dual-broadband vertically polarized omnidirec-tional patch antenna with simple low-profile structure is proposed for mobile communication. The design is formed by a wheel-shaped patch, a circular ground reflector, four arc-shaped strips, four feeding pins, eight shorting pins and a 1-to-4 power divider. The wheel-shaped patch, connected to the ground reflector by eight shoring pins, is fed by the 1-to-4 power divider to generate four TM01 or TM02 resonant modes. Then four arc-shaped strips are embedded in the wheel-shaped patch to generate an extra TM01 resonant mode. Based on the new scheme, five resonant modes are inspired to form two wide frequency bands. The proposed antenna exhibits dual broad bandwidths of 38.6% (1.63-2.41 GHz) and 47.4% (3.17-5.14 GHz). Additionally, the proposed design has a simply two-layer structure and a thin profile of 0.058λL, where λL represents the free-space wavelength at the lowest operating band, which makes it suitable for indoor mobile communication systems within the bands of GSM1800/IMT2000/ LTE2300 and 5G NR 78/79. © 2002-2011 IEEE.

关键词： Omnidirectional antennas

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Advancements in graphene-based composites: A review of the emerging applications in healthcare

Smart Materials in Medicine

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Smart Materials in Medicine 2025年第1期6卷 120-138页

作者： Batool, Farwa Muhammad, Saz Muazzam, Rabia Waqas, Muhammad Ullah, Zia Roy, Shubham Zhang, Yinghe Wang, Ke Guo, Bing Department of Chemistry Lahore Garrison University DHA Phase VI Lahore Pakistan School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China School of Science Shenzhen Key Laboratory of Flexible Printed Electronics Technology Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Harbin Institute of Technology Shenzhen518055 China Government Queen Mary Graduate College Lahore Pakistan

Graphene and related materials are emerging revolutionary materials due to fascinating stimuli-responsive physiochemical properties having widespread applications in developing advanced nano-systems for detection, diagnostics, and therapeutics in biomedical fields. Various materials like metal nanoparticles, polymers, dyes, drugs, and proteins could be combined yielding graphene-based composite materials (GBCMs) to synergistically fulfill different biomedical requirements. The 2D conjugated structure, easy surface functionalization via covalent or van der Waal interactions, and combination with different components for versatile functionalities altogether contribute to the development of GBCM for healthcare applications. This review specifically focuses on GBCMs and discusses specific material properties relevant to their material applications in healthcare. Furthermore, the synthesis, toxicity, and biocompatibility of these GBCMs, and their interactions with biological materials are thoroughly discussed. Importantly, the recent cutting-edge applications in the field of healthcare, including its role in the development of antibacterial, anti-viral, and photothermal therapies, wound healing, drug delivery, neurodegenerative disease therapy, and biosensing based on GBCMs are well-updated. Additionally, the applications of GBCMs in point-of-care devices, wearable electronics, and tissue engineering are well summarized. We hope this review opens up more possibilities to design more innovative healthcare materials derived from graphene. © 2025 The Authors

关键词： Biocompatibility

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A novel single-substrate Sr2Ga2SiO7:Tb3+ green phosphor for full-spectrum white LED

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Applied Physics A: Materials Science and Processing 2025年第6期131卷 1-10页

作者： Liu, Zhifang Wang, Subin Xu, Yingchao Li, Jing Du, Yunxiang Hong, Junhuang Chen, Zhenyu School of Opto-Electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen361024 China Fujian Provincial Key Laboratory of Opto-Electronics Technology and Devices Fujian Xiamen361024 China

A series of novel silicate green phosphors Sr2-xGa2SiO7: xTb3+ (with x ranging from 0.01 to 0.06) were successfully synthesized by the high-temperature solid-state reaction technique. The samples were analyzed for their phase morphology, luminescent properties, concentration quenching, thermal stability, fluorescence lifetime and CIE chromaticity coordinates. Under the excitation of 370 nm ultraviolet light, the phosphors exhibited strong green emission characteristics. Analysis of the emission spectra of different concentration of samples determined that the optimal doping concentration is x = 0.04, at which the samples exhibit the best luminescent performance. Additionally, these samples demonstrated high thermal stability, at 453 K, the luminous intensity retains 88.3% of its initial value at room temperature. The research results suggest that Sr₂Ga₂SiO₇:Tb3⁺ green phosphors have significant application potential, particularly in addressing the narrow emission spectrum limitations of conventional WLEDs and fluorescence-based marking technologies. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Fluorescence quenching

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Multitarget gas alarm system for high-performance and anti-interference chemical warfare agents simulants detection

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Science China(Technological Sciences) 2025年第3期68卷 349-358页

作者： Yubin YUAN Qiang WU Menglong JIAO Haiyang WU Weihua LIU Xuming WANG Xiangrui BU Gong LI Chuanyu HAN Long HU Xin LI Xiaoli WANG Shool of Microelectronics School of Electronics and Information EngineeringXi’an Jiaotong UniversityXi’an710049China The Key Lab of Micro-nano Electronics and System Integration of Xi’an City Xi’an710049China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou310024China School of Automation and Information Engineering Xi’an University of TechnologyXi’an710048China Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi’an Jiaotong UniversityXi’an710049China School of Science Xi’an Jiaotong UniversityXi’an710049China

Chemical warfare agents(CWAs)can cause significant harm to health and even death in a very short time even when inhaled in small amounts(~100 mg min/m^(3)).Detection equipment based on conventional techniques,including gas chromatography-mass spectrometry,Raman spectroscopy,fluorescence spectroscopy,and ion mobility spectrometry,have the disadvantages of high cost,long detection time,and high power ***,portable,and convenient equipment for target CWAs detection under interference is a *** this study,we propose an alarm system comprising a multitype micro sensor array and a field-programmable gate array-based readout circuit for CWAs simulants *** common volatile organic compound,temperature,and water vapor interference,the proposed multitype sensor-based detection system realizes an alarm function in less than 20 s with thresholds of 1 ppm dimethyl methylphosphonate(DMMP),4.6 ppm 2,2'-dichlorodiethyl ether(DCE),and 20 ppm SO_(2).Furthermore,the proposed detection system was evaluated outside the laboratory and passed the wilderness test,demonstrating its reliability in the *** believe that the proposed alarm system will contribute to the development of intelligent,portable,low-cost,and anti-interference CWAs detection technology.

关键词： alarm system CWAs simulants surface acoustic wave sensor mixed gas anti-interference

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Few-Shot Source Separation for IoT Anti-Jamming via Multi-Task Learning and Meta-Learning

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IEEE Internet of Things Journal 2025年第11期12卷 16761-16776页

作者： Guo, Pengcheng Yu, Miao Li, Cheng An, Kang Sun, Yifu Chatzinotas, Symeon Niyato, Dusit National University of Defense Technology Sixty-Third Research Institute China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System China Kyung Hee University College of Electronics and Information Yongin-si17104 Korea Republic of Nanyang Technological University College of Computing and Data Science Singapore639798 Singapore

Malicious jamming attacks pose a significant threat to the integrity and performance of Internet of Things (IoT) networks. However, many jamming patterns are rare or infrequent, which makes them difficult to counter effectively. This paper addresses the critical issue of anti-jamming (AJ) under few-shot sample conditions in IoT networks. Source separation is a key component of AJ communication. Although deep learning-based source separation has demonstrated significant advantages, it typically requires a large amount of labeled data, which can be impractical in certain environments. To overcome this challenge, we propose two novel schemes that leverage multi-task learning (MTL) and meta-learning (ML) to enhance the model's signal separation capabilities within the constraints of limited sample scenarios. MTL enhances robustness by leveraging shared representations across tasks, while ML allows for rapid adaptation to novel jamming signals with minimal samples. Specifically, we employ a modified separation model, SepFormer, as our baseline and integrate MTL and ML schemes to enable the separation of unknown or few-shot jamming signals. Additionally, we have constructed two datasets encompassing both simulated and real-world environmental data to test and evaluate the performance of the proposed methods. Simulation results demonstrate the superior AJ performance of our schemes, particularly when compared with a direct application of the separation model with few-shot samples. Furthermore, our evaluation of performance across various jamming scenarios and interference-to-signal ratios (ISR) further confirms the effectiveness of our proposed scheme. © 2014 IEEE.

关键词： Zero-shot learning

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AMA-Net: Adaptive Masking Attention Network for Agricultural Crop Classification From UAV Images

IEEE Transactions on AgriFood Electronics

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IEEE Transactions on AgriFood electronics 2025年第1期3卷 246-253页

作者： Wang, Xu Wang, Deyi He, Zhaoshui Lin, Zhijie Xie, Shengli Guangdong Mechanical and Electrical Polytechnic School of Electronics and Communication Guangzhou510550 China Guangdong University of Technology School of Automation Guangzhou510006 China Key Laboratory for IoT Intelligent Information Processing and System Integration of Ministry of Education Guangzhou510006 China Guangdong Provincial Key Laboratory of Intelligent Systems and Optimization Integration Guangzhou510006 China

Agriculture crop classification is helpful for agricultural production. However, it is challenging to classify crops from the agriculture image suffering from these problems: 1) Crops are often masked in complex backgrounds;2) There is high similarity between crop categories. To address these problems, an adaptive masking attention network (AMA-Net) is proposed for agriculture crop identification from natural images, where the adaptive masking (AM) module is developed to distinguish the crop from the complex background by selectively eliminating redundant information of feature maps, and the fair attention module is devised to identify similar crops between categories by modeling the fine-grained features. Experiments conducted on the benchmark show the effectiveness and superiority of the proposed AMA-Net, achieving the performance of 96.65%, 96.65%, 97.13%, and 96.72% on the accuracy, precision, recall, and F1-score, respectively, which is better than other state-of-the-art methods. © 2023 IEEE.

关键词： Crops Agriculture Accuracy Visualization Training Production Autonomous aerial vehicles Attention mechanisms Adaptive systems Support vector machines

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Diversified applications of triboelectric and electrostatic effect

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Friction 2025年第2期13卷 3-17页

作者： Lin Huang Guangzhao Huang Dandan Zhang Xiangyu Chen School of Instrumentation Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China College of Mathematics and Physics Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric PowerShanghai University of Electric PowerShanghai 200090China CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChina Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of China Academy of SciencesBeijing 100049China

The application study of triboelectric and electrostatic effects,with roots tracing back hundreds of years,has continued to evolve and develop in industrial production,science,technology,and other *** methods have been proposed for the preparation and processing of triboelectric materials,resulting in significant advancements in their charge density and application *** paper aims to provide a comprehensive understanding of the application progress of the triboelectric *** begins by summarizing the fundamental theoretical mechanism of ***,a detailed review of various applications related to triboelectric effect and electrostatic induction is conducted,encompassing electrostatic adsorption,electret formation,electrostatic self-assembly,triboelectric generator,self-powered sensor,and mechanical force ***,different triboelectric materials and their preparation and modification methods are also explored in accordance with different application ***,this paper discusses the future development prospects and challenges associated with the triboelectric *** also emphasizes the necessity for further research and development in specific fields,offering valuable insights for future scientific research and practical implementation.

关键词： triboelectric effect application triboelectric materials preparation and processing

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Geometry-Based Stochastic MIMO Channel Model for Near-Field and Far-Field Scenarios of Integrated Sensing and Communications

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IEEE Transactions on Vehicular technology 2025年第5期74卷 6928-6940页

作者： Jin, Yunwei He, Ruisi Ai, Bo Yuan, Yuan Niu, Yong Zhang, Haoxiang Beijing Jiaotong University State Key Laboratory of Advanced Rail Autonomous Operation School of Electronics and Information Engineering Frontiers Science Center for Smart High-speed Railway System Beijing100044 China Ministry of Industry and Information Technology China Academy of Industrial Internet Beijing100804 China

Integrated sensing and communication (ISAC) has become a promising technology in current sixth-generation (6G) wireless communications due to its ability to support both communication and sensing. Existing works regarding ISAC channels mainly focus on far-field propagation conditions based on plane wave assumption. However, with the deployment of ultra-massive multiple-input multiple-output (MIMO), the far-field assumption may no longer hold, as the communication and sensing propagation distances distances may be comparable to the array aperture size. To address this issue, we propose a three-dimensional MIMO channel model that simultaneously considers near-field and far-field propagation conditions in ISAC environments. Additionally, we distinguish the communication and sensing propagation environments by employing different effective scatterer distributions. In the model, the sensing channel is divided into target sensing and environmental sensing components, whereas the communication channel is divided into line-of-sight and non-line-of-sight components. The weighted sum of each component in communication and sensing channels results in accurate channel representations. Based on the proposed model, we derive and thoroughly investigate space-time-frequency correlation function, normalized absolute error function, and channel capacity. A key observation is that the channel correlation strongly depends on scatterer distribution. In certain conditions, the sensing channel can effectively capture the behavior of the communication channel. Error function results indicate that the proposed channel model achieves fairly high accuracy in ultra-massive MIMO scenarios. These findings provide essential support for the development of ISAC systems in future 6G wireless communications. © 1967-2012 IEEE.

关键词： Stochastic systems

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GNSS/SINS tight combination navigation technology for multirotor UAV 3

GNSS/SINS tight combination navigation technology for multir...

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2024 3rd International Conference on Aerospace and Control Engineering, ICoACE 2024

作者： Yang, Jianlei Jin, Zhengzhen Zheng, Shuaiyong Jin, Yaohaoran Hu, Na Zhao, Lili Key Laboratory of Satellite Navigation System and Equipment Technology Shijiazhuang050081 China The 54 Research Institute China Electronics Technology Group Shijiazhuang050081 China School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China

Amidst the swift progress in unmanned aerial vehicle (UAV) technology, the enhancement of navigation precision and robustness is paramount for ensuring flight safety and managing the intricacies of various missions. This research presents a sophisticated, tightly integrated Global Navigation Satellite system (GNSS) and Strapdown Inertial Navigation system (SINS) navigation framework designed to synergize the capabilities of both systems, thereby mitigating their respective shortcomings in adverse environments. By utilizing an Extended Kalman Filter for the real-time calibration of inertial sensor errors, this system markedly enhances the navigation accuracy of UAVs. Our rigorous testing, conducted with genuine flight data, revealed that the integrated system surpasses standalone inertial navigation systems, especially in managing position errors, resulting in a 12.5% enhancement in overall navigation accuracy. This study solidifies the technical foundation for UAV applications and advances the development of future navigation systems. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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