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Lipid droplets imaging with three-photon microscopy

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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Numerical study on the impact of interface contact resistance on the performance of a PEMFC with serpentine flow field

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IOP Conference Series: Earth and Environmental Science 2021年第1期675卷

作者： Shuyu Chen Sheng Feng Wenbo Lu Qi Chen Wuhan National High Magnetic Field Center and State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology 430074 Wuhan China

The performance of a proton exchange membrane fuel cell (PEMFC) strongly relies on the flow-field design. In this study, a three-dimensional, multiphase, and non-isothermal PEMFC model with single serpentine flow field has been developed to investigate the effect of interface contact resistance (ICR) between the bipolar plate (BP) and gas diffusion layer (GDL) on the flow field dimension. In the cases of 25 different combinations of channel and rib width, polarization curves and power density curves of the PEMFC without ICR and with ICR of 7.418 mΩ.cm2 as well as 21 mΩ.2 are investigated. The results show that ICR has little effect on channel pressure drop but on liquid water accumulation. The value of ICR affects both the ohmic loss stage and concentration loss stage of the polarization curves. The power density of the PEMFC without ICR at the operating voltage 0.5V decreases as the rib width increases, while that with ICR increases as the rib width increases. Furthermore, the influence of invalid active area in BPs caused by flow field configuration on the cell performance should not be neglected when the ICR value is lower than 10 mΩ.2.

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BAlN for III-nitride UV light emitting diodes: undoped electron blocking layer

arXiv

引用

arXiv 2020年

作者： Gu, Wen Lu, Yi Lin, Rongyu Guo, Wenzhe Zhang, Zi-Hui Ryou, Jae-Hyun Yan, Jianchang Wang, Junxi Li, Jinmin Li, Xiaohang Research and Development Center for Solid State Lighting Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Advanced Semiconductor Laboratory King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Institute of Micro-Nano Photoelectron and Electromagnetic Technology Innovation School of Electronics and Information Engineering Hebei University of Technology Key Laboratory of Electronic Materials and Devices of Tianjin 5340 Xiping Road Beichen District Tianjin300401 China University of Houston HoustonTX77204-4006 United States

The undoped BAlN electron-blocking layer (EBL) is investigated to replace the conventional AlGaN EBL in light-emitting diodes (LEDs). Numerical studies of the impact of variously doped EBLs on the output characteristics of LEDs demonstrate that the LED performance shows heavy dependence on the p-doping level in the case of the AlGaN EBL, while it shows less dependence on the p-doping level for the BAlN EBL. As a result, we propose an undoped BAlN EBL for LEDs to avoid the p-doping issues, which a major technical challenge in the AlGaN EBL. Without doping, the proposed BAlN EBL structure still possesses a superior capacity in blocking electrons and improving hole injection compared with the AlGaN EBL having high doping. This study provides a feasible route to addressing electron leakage and insufficient hole injection issues when designing UV LED structures. Copyright © 2020, The Authors. All rights reserved.

关键词： Electrons

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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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Deep-Adversarial-Transfer Learning Based Fault Classification of Power Lines in Smart Grid

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IOP Conference Series: Earth and Environmental Science 2021年第1期701卷

作者： J Han S H Miao H R Yin S Y Guo Z X Wang F X Yao Y J Lin 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

Due to the insufficiency of actual fault samples, the machine learning based fault classification models of the power lines in smart grid are generally trained using the simulated fault samples acquired from software, such as Matlab/Simulink. Yet, the fault features of actual and simulated fault samples are different, and the existed methods might not be valid or accurate enough in classifying the fault types of actual power lines. Thus, a new fault classification model for actual power lines in smart grid based on deep-adversarial-transfer learning is proposed. Firstly, the conditional generative adversarial network (CGAN) is applied for the augmentation of actual fault samples, so as to increase the data amount to some extent. Then, the loss function of convolutional neural network (CNN) is resigned based on transfer learning, and a new fault classification framework based on improved CNN (I-CNN) is proposed. The I-CNN based model is trained using both adversarial and simulated samples, and can make the distrubution of both catergories of samples features closer, thereby achieving to classify the fault types of actual power lines. To verify the method validity, the real-world power line is used for case study. The results show the effectiveness of the proposed method.

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Effect of Background Magnetic Field on Quench Properties in Rebco and Bi-2223 Tapes

SSRN

引用

SSRN 2022年

作者： Qiu, T. Zhu, Y.P. Hu, X.B. Liu, Jian Cai, Lijun Xu, M. Zhang, S.N. Feng, J.Q. Tan, Yunfei Yang, Xinsheng Zhao, Y. CRSC Research & Design Institute Group Co. Ltd. Beijing100071 China Superconductivity and New Energy R&D Center Southwest Jiaotong University Chengdu610031 China Southwestern Institute of Physics Chengdu610041 China Northwest Institute for Nonferrous Metal Research Xi’an710016 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Quench propagation characteristics are very important for high temperature superconductor (HTS). In this paper, quench properties including the minimum quench energy (MQE) and the normal zone propagation velocity (NZPV) in different HTS tapes (REBCO and Bi-2223) under different value and position of background magnetic field were investigated. After applying a heat pulse to REBCO and Bi-2223 tapes, the electric field of each zone was measured to obtain the parameters characterizing MQE and NZPV. The experimental results show that the MQE and NZPV are different with different background magnetic field position for the same kind tape. At the position of heater, the magnetic field will also have an impact on the MQE. The equivalent heat capacity of the two tapes was calculated respectively. It was found that the equivalent heat capacity of Bi-2223 tape is larger than REBCO tape. According to formula derivation, the larger the equivalent heat capacity, the larger the MQE and the smaller NZPV. © 2022, The Authors. All rights reserved.

关键词： High temperature superconductors

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Mixed-time rolling energy optimization of islanded microgrid considering source-load uncertainty

引用

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

作者： Y L Liu S H Miao Z W Liu 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

Effective energy optimization means make full use of distributed generation, energy storage and load resources in islanded microgrid, reduce system operation and maintenance costs, and increase the service life of equipment. Based on this, a hybrid rolling energy optimization method for islanded microgrid considering source-load uncertainty is proposed in this paper. Firstly, the source-load uncertainty model based on triangular fuzzy number is established, and the uncertainty programming theory is used to transform the model into a deterministic form. Then, considering the demand-side response, an islanded microgrid energy optimization model based on fuzzy chance-constrained programming is established. On this basis, in order to reduce the dependence of the model on prediction accuracy, a hybrid time division method based on sliding time window is proposed, and an adaptive adjustment method of model confidence is proposed to coordinate the robustness and economy of the model. Finally, an example is given to verify the correctness and effectiveness of the proposed energy optimization strategy.

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