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arXiv 2018年

作者： He, Mingbo Xu, Mengyue Ren, Yuxuan Jian, Jian Ruan, Ziliang Xu, Yongsheng Gao, Shengqian Sun, Shihao Wen, Xueqin Zhou, Lidan Liu, Lin Guo, Changjian Chen, Hui Yu, Siyuan Liu, Liu Cai, Xinlun State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-sen University Guangzhou510275 China Centre for Optical and Electromagnetic Research Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Higher-Education Mega-Center Sci. Bldg. No. 5 Guangzhou510006 China

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Reversely tapered multicore fibers for simplified all-fiber fan-in and fan-out devices

Reversely tapered multicore fibers for simplified all-fiber ...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Wei Ji Zihao Shen Ruowei Yu Caoyuan Wang Zhengyu Yan Liying Liu Lei Xu Kin Seng Chiang Limin Xiao Advanced Fiber Devices and Systems Group Key Laboratory of Micro and Nano Photonic Structures (MoE) Key Laboratory for Information Science of Electromagnetic Waves (MoE) Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing School of Information Science and Technology Fudan University Shanghai China City University of Hong Kong Hong Kong SAR China Yiwu Research Institute of Fudan University Yiwu China

We propose a multicore fiber reverse-tapering technique for the construction of a fused taper type fan-in and fan-out device with excellent overall performance in coupling loss, crosstalk, and return loss without usin... 详细信息

ISBN: (纸本)9781957171005

关键词： Performance evaluation Optical losses Couplings Optical fiber losses Multicore processing Crosstalk Insertion loss

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An Intelligent Sensing Platform for Detecting and Identifying Biochemical Substances Based on Terahertz Spectra

SSRN

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SSRN 2024年

作者： Chen, Yusa Xiong, Shisong Wu, Meizhang Huang, Xiwen Sun, Hongshun Cao, Yunhao Li, Liye Ma, Lijun Wu, Wengang Zhao, Guozhong Meng, Tianhua National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing100871 China School of Integrated Circuits Peking University Beijing100871 China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology University Beijing100096 China Department of Physics Capital Normal University Beijing100048 China Institute of Solid State Physics Shanxi Provincial Key Laboratory of Microstructure Electromagnetic Functional Materials Shanxi Datong University Datong037009 China

This paper presents the development of an intelligent sensing platform dedicated to accurately identifying terahertz (THz) spectra obtained from various biochemical substances. The platform currently has two distinct identification modes, which focus on identifying five amino acids, namely phenylalanine, methionine, lysine, leucine, and threonine, and five carbohydrates, namely aspartame, fructose, glucose, lactose monohydrate, and sucrose based on their THz spectra. The first mode, called One-dimensional THz Spectrum Identification (OTSI), combines THz time-domain spectroscopy (THz-TDS) with the proposed mini convolutional neural network (MCNN) model. THz-TDS detects biochemical substances, while the MCNN model identifies the THz spectra. The MCNN model has a simple structure and only needs to deal with the THz absorption coefficients of biochemical substances, which are less computationally intensive and easily converged. The model can achieve 99.07% accuracy in identifying one-dimensional THz spectra of the ten biochemical substances. The second mode, THz Spectrum Image-based Identification (TSII), applies the YOLO-v5 target detection model to THz spectral image recognition. The YOLO-v5 model uses THz absorption peaks as identification features and can identify biochemical substances based on only one or several THz absorption peaks. The accuracy of the YOLO-v5 model in identifying THz absorption spectrum images of ten biochemical substances reaches more than 89%. This feature broadens the platform's utility in biomolecular analysis and paves the way for further research and development in detecting and analyzing diverse biological compounds. © 2024, The Authors. All rights reserved.

关键词： Neural network models

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Optimal supplementary control for small signal stability of power system with DFIG integration

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 424-431页

作者： Zhou, Zhen Sun, Jinwen Zeng, Fantao Lin, Xiangning Li, Xianshan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China College of Electrical Engineering and New Energy Three Gorges University Yichang443002 China

According to the fact that large amount of integrated wind power can weaken the small signal stability of power system, a supplementary damping control scheme on the maximum power tracking part of DFIG is designed to increase damping of power system. To achieve best performance, parameters of the damping control is tuned by using Genetic Algorithm. Results of eigenvalue analysis and simulation on WSCC three-machine nine-bus system with DFIG integrated demonstrate that the proposed supplementary control scheme can effectively suppress the oscillation of the system. Finally, the above DFIG damping control scheme is improved to be insensitive to the change of wind speed and simulation results show that the new damping control can steadily enhance the system damping characteristics and has high practical value. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： Damping

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Editorial - belling the cat, revisited

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IEEE Transactions on Reliability 2002年第1期51卷 2-2页

作者： R.A. Evans Technology (Huazhong University of Science and Technology) State Key Laboratory of Advanced Electromagnetic Engineering Wuhan Hubei Province P. R. China

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Lipid droplets imaging with three-photon microscopy

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Journal of Innovative Optical Health Sciences 2023年第4期16卷 20-28页

作者： Mubin He Hojeong Park Guangle Niu Qiming Xia Hequn Zhang Ben Zhong Tang Jun Qian State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou 310058P.R.China Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Clear Water BayKowloonHong Kong 999077P.R.China Shenzhen Research Institute of Shandong University Shenzhen 518057 P.R.China Department of General Surgery Sir Run Run Shaw Hospital School of MedicineZhejiang University Hangzhou 310000P.R.China School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen Guangdong 518172P.R.China

Lipid droplets(LDs)participate in many physiological processes,the abnormality of which will cause chronic diseases and pathologies such as diabetes and *** is crucial to monitor the distribution of LDs at high spatial resolution and large ***,we carried three-photon imaging of LDs in fat *** to the large three-photon absorption cross-section of the luminogen named NAP-CF_(3)(1:67×10^(-79) cm^(6) s^(2)),three-photon fluorescence fat liver imaging reached the largest depth of 80μ*** liver diagnosis was successfully carried out with excellent performance,providing great potential for LDs-associated pathologies research.

关键词： Lipid droplets three-photon fluorescence microscopy fat liver,deep-tissue imaging

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The Exploration of Upconversion Luminescence Nanoprobes for Tobramycin Detection Based on Förster Resonance Energy Transfer

SSRN

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SSRN 2023年

作者： Chen, Wei Wan, Tonghua Song, Wei Wen, Hongli Qiu, Xue Zhan, Qiuqiang Yu, Huijuan Yu, Lin Aleem, Abdur Raheem Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions GuangDong Engineering Technology Research Center of Modern Fine Chemical Engineering School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China Analysis and Test Center Guangdong University of Technology Guangzhou510006 China Smart Medical Innovation Technology Center Guangdong University of Technology Guangzhou510006 China Jieyang515200 China Centre for Optical and Electromagnetic Research South China Academy of Advanced Optoelectronics South China Normal University Guangzhou510006 China Department of Physics The University of Texas at Arlington ArlingtonTX76019-0059 United States

Tobramycin (TOB) is a broad-spectrum aminoglycoside extensively used as veterinary medicine to treat bacterial infections. However, TOB residue in food and environment may cause great threat to human health. Here, we report, for the first time, the upconversion nanoparticles (UCNPs) for TOB detection based on Förster resonance energy transfer (FRET). The upconversion (UC) luminescence from core-shell structured UCNPs was effectively quenched after addition of MnO2 nanosheets due to the effective energy transfer from the UCNPs to MnO2 nanosheets. When interacting with TOB, the UC luminescence was restored and increased as a result of coupling between TOB and aptamers, with MnO2 nanosheets dropping off the latter one. The UCNPs-MnO2 aptasensors for TOB detection have a good selectivity and sensitivity in a linear range of 10−180 ng·mL−1 with a limit of detection (LOD) of 3.04 ng·mL−1. The sensors were tested for TOB detection in real samples of liquid milk and fishes and the results are very good and satisfactory. These type of aptasensors are promising for practical applications as they have a high sensitivity, selectivity, low LOD, and are autofluorescence-free. © 2023, The Authors. All rights reserved.

关键词： Silica

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Terahertz-Polarizing Effect Based on Geometric Anisotropy of Ti3C2Tx Mxene Nanosheets

SSRN

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SSRN 2024年

作者： Lee, Changjae Oh, Eon-Taek Park, Tae Gwan Lee, Seongeun Kim, Seon Joon Choi, Yun-Seok Rotermund, Fabian Yoon, Dong Ki Department of Chemistry Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of Materials Architecturing Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Division of Nanoscience and Technology KIST School University of Science and Technology Seoul02792 Korea Republic of Convergence Research Center for Solutions to Electromagnetic Interference in Future-mobility Korea Institute of Science and Technology Seoul02792 Korea Republic of Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Oak Ridge National Laboratory United States

Two-dimensional (2D) nanomaterials have garnered considerable attention due to their unique properties, such as thinness and excellent electronic properties. The inherent anisotropy of 2D nanomaterials, which is characterized by their high aspect ratio, can maximize the directional functionality to enhance the conductivity and utilization of edges. Here, we demonstrate how to utilize the edges of titanium carbide (Ti3C2Tx) MXene nanosheet to control the linear polarization in the terahertz (THz) frequency range. By a simple and unique vertical alignment exploiting the high surface charge and excellent colloidal dispersibility of MXene nanosheets, MXene nanosheets are vertically oriented along an applied AC electric field. The well-aligned edges justify the THz polarizing effect, revealing outstanding performances such as the broadband coverage in 0.2 – 1.5 THz and an exceptional extinction ratio reaching 20 dB. Furthermore, we vary the local orientation of the vertical MXene nanosheets by tailoring the applied electric field, enabling spatially controllable polarization capabilities. Our results can provide a generic tool for the utilization of 2D nanomaterials in diverse potential applications in optics and electronics. © 2024, The Authors. All rights reserved.

关键词： Nanosheets

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Spin-valley locking effect in defect states of monolayer MoS2

arXiv

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arXiv 2020年

作者： Wang, Yaqian Deng, Longjiang Wei, Qilin Wan, Yi Liu, Zhen Lu, Xiao Li, Yue Bi, Lei Zhang, Li Lu, Haipeng Chen, Haiyan Zhou, Peiheng Zhang, Linbo Cheng, Yingchun Zhao, Xiaoxu Ye, Yu Huang, Wei Pennycook, Stephen John Loh, Kian Ping Peng, Bo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu611731 China Key Laboratory of Flexible Electronics Institute of Advanced Materials Nanjing Tech University Nanjing211816 China State Key Laboratory for Artificial Microstructure & Mesoscopic Physics Frontiers Center for Nano-optoelectronics School of Physics Peking University Beijing100871 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore Department of Chemistry Centre for Advanced 2D Materials Graphene Research Centre National University of Singapore 117549 Singapore

Valley pseudospin in two-dimensional (2D) transition-metal dichalcogenides (TMDs) allows optical control of spin-valley polarization and intervalley quantum coherence. Defect states in TMDs give rise to new exciton features and theoretically exhibit spin-valley polarization;however, experimental achievement of this phenomenon remains challenges. Here, we report unambiguous valley pseudospin of defect-bound localized excitons in CVD-grown monolayer MoS2;enhanced valley Zeeman splitting with an effective g-factor of -6.2 is observed. Our results reveal that all five d-orbitals and the increased effective electron mass contribute to the band shift of defect states, demonstrating a new physics of the magnetic responses of defect-bound localized excitons, strikingly different from that of A excitons. Our work paves the way for the manipulation of the spin-valley degrees of freedom through defects toward valleytronic devices. Copyright © 2020, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Evaluation of photovoltaic power station operation under the influence of natural environment

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IOP Conference Series: Earth and Environmental Science 2019年第1期354卷

作者： J H Zhang S H Miao Y W Li D Zhang S Y Guo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

This paper presents a method for evaluating the operation statute of photovoltaic power plants. It considers the impact of various kinds of natural environment. Firstly, by analysis the impact of different natural factors on photovoltaic power generation, we can find the most influential factors that affect the output of photovoltaic power station. Secondly, use these factors as a standard to separate the natural environments into different kinds. Thirdly, use the AHP method to establish an indicator evaluation system and multiple indicator weight determination methods for different environments. Then, setting proper formula to evaluation the operation statue of photovoltaic power station. Finally, in part 7 a case is proposed to illustrate the present method.

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