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A colorimetric-bionic sensor for multimodal molecular sensing using hierarchical metamaterials

Device 2025年第5期3卷

作者： Geng, Wenhui Zhou, Ying Huang, Kang Ying, Yibin Xie, Lijuan College of Biosystems Engineering and Food Science Zhejiang University 866 Yuhangtang Road Hangzhou 310058 China The National Key Laboratory of Agricultural Equipment Technology Beijing 100083 China Zhejiang Key Laboratory of Intelligent Sensing and Robotics for Agriculture Hangzhou 310058 China Hangzhou Customs Technology Center 398 Jianshe San Road Xiaoshan District Hangzhou City China Department of Biological Systems Engineering Washington State University Pullman 99164 WA United States

Metamaterials can enhance a local electric field for molecular sensing. However, the difficulty in specifically recognizing target molecules and integrating multiple functionalities restricts their development. Here, we present a hierarchical metamaterial-based colorimetric-bionic sensor (HMm-CBs) using a layer-by-layer assembly method for multimodal molecular sensing. The CBs layers offer molecular recognition ability by enabling the specific perception of analytes, and the HMm layers provide coupling of vibrations between analyte molecules at the terahertz (THz) frequency. The HMm-CBs have broadband adaptability in controlling electromagnetic waves from optical to THz frequency. As a proof of principle, we designed a sensor for analyzing tetracycline hydrochlorides (TCHs). The sensor, in conjunction with a back propagation neural network (BPNN), identifies four types of TCHs. As a demonstration, a multichannel indicator is created for real-time monitoring of shrimp freshness and volatile metabolites. © 2025 The Author(s)

关键词： antibiotics carbon nanotubes chemometric algorithms colorimetric sensor array DTI-3: Develop metamaterials

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Aerial-PASS: Panoramic annular scene segmentation in drone videos

arXiv

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arXiv 2021年

作者： Sun, Lei Wang, Jia Yang, Kailun Wu, Kaikai Zhou, Xiangdong Wang, Kaiwei Bai, Jian State Key Laboratory of Optical Instrumentation Zhejiang University China Institute for Anthropomatics and Robotics Karlsruhe Institute of Technology Germany

Aerial pixel-wise scene perception of the surrounding environment is an important task for UAVs (Unmanned Aerial Vehicles). Previous research works mainly adopt conventional pinhole cameras or fisheye cameras as the imaging device. However, these imaging systems cannot achieve large Field of View (FoV), small size, and lightweight at the same time. To this end, we design a UAV system with a Panoramic Annular Lens (PAL), which has the characteristics of small size, low weight, and a 360° annular FoV. A lightweight panoramic annular semantic segmentation neural network model is designed to achieve high-accuracy and real-time scene parsing. In addition, we present the first drone-perspective panoramic scene segmentation dataset Aerial-PASS, with annotated labels of track, field, and others. A comprehensive variety of experiments shows that the designed system performs satisfactorily in aerial panoramic scene parsing. In particular, our proposed model strikes an excellent trade-off between segmentation performance and inference speed suitable, validated on both public street-scene and our established aerial-scene datasets. Copyright © 2021, The Authors. All rights reserved.

关键词： Antennas

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Reconfigurable Intelligent Surface-Assisted Wireless Communication: Path loss Modeling with Multipath Fading 13

Reconfigurable Intelligent Surface-Assisted Wireless Communi...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Li, Sifeng Zhao, Xiongwen Zhang, Yu Wang, Xiaoqing Geng, Suiyan Su, Xin Qin, Haichao Sun, Shaohui North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing102206 China Cict Mobile Communication Technology Co. Ltd. Beijing100083 China

ISBN: (纸本)9781665418126

Reconfigurable intelligent surface (RIS) is a key enabling technology for 6G. The free-space path loss model of RIS has been proposed in existing research, but the influence of multipath is not taken into account. In this paper, by establishing a RIS-assisted wireless communication model that considers multipath factors, the path loss of the RIS-assisted SISO system affected by multipath fading is modeled and the path loss simulation results are fitted with the CI model. This work adds the impact of multipath on RIS path loss model for the first time and lays the foundation for the practical application of RIS. © 2021 IEEE.

关键词： Multipath fading

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A High-Isolation Eight-Way Power Combiner

A High-Isolation Eight-Way Power Combiner

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作者： Guo, Letian Li, Jiawei Huang, Wenhua Shao, Hao Xie, Shaoxi Deng, Guangjian Zhang, Yuchuan Ren, Junyan State Key Laboratory of ASIC and System Fudan University Shanghai China Science and Technology on High Power Microwave Laboratory Northwest Institute of Nuclear Technology Xi'an China

A high-isolation eight-way power combiner is proposed in this article that is constructed by cascading three stages of power combiners in series. Its high isolation and low return loss are realized by means of lumped isolators, an isolated side network, and a resistive septum. The eight-way power combiner is basically a 17-port mode network, consisting of eight input ports, eight matching ports, and one output port. The mode network matrix cascade computation clearly reveals the working mechanism. Based on the designed 17-port network, an eight-way power combiner is realized with eight matching ports connected to loads. The measurements agree well with the simulations. From 7.8 to 10.2 GHz, the return loss at the input ports is greater than 19 dB, the return loss at the output port is greater than 18 dB, the isolation is at least 19 dB, and the insertion loss is less than 0.4 dB. The proposed eight-way power combiner has the merits of high isolation, low return loss, low insertion loss, high power capacity, and ease of integration, with great potential for integration into high-power amplifiers. © 2019 IEEE.

关键词： Insertion losses

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Aerial-PASS: Panoramic Annular Scene Segmentation in Drone Videos

Aerial-PASS: Panoramic Annular Scene Segmentation in Drone V...

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European Conference on Mobile Robots (ECMR)

作者： Lei Sun Jia Wang Kailun Yang Kaikai Wu Xiangdong Zhou Kaiwei Wang Jian Bai State Key Laboratory of Optical Instrumentation Zhejiang University China Institute for Anthropomatics and Robotics Karlsruhe Institute of Technology Germany

Aerial pixel-wise scene perception of the surrounding environment is an important task for UAVs (Unmanned Aerial Vehicles). Previous research works mainly adopt conventional pinhole cameras or fisheye cameras as the imaging device. However, these imaging systems cannot achieve large Field of View (FoV), small size, and lightweight at the same time. To this end, we design a UAV system with a Panoramic Annular Lens (PAL), which has the characteristics of small size, low weight, and a 360° annular FoV. A lightweight panoramic annular semantic segmentation neural network model is designed to achieve high-accuracy and real-time scene parsing. In addition, we present the first drone-perspective panoramic scene segmentation dataset Aerial-PASS, with annotated labels of track, field, and others. A comprehensive variety of experiments shows that the designed system performs satisfactorily in aerial panoramic scene parsing. In particular, our proposed model strikes an excellent trade-off between segmentation performance and inference speed, validated on both public street-scene and our established aerial-scene datasets.

关键词：

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Stereolithography-Based Additive Manufacturing of Dense 3y-Tzp Zirconia Ceramics

SSRN

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SSRN 2023年

作者： Hussain, M. Irfan Xia, Min Ren, XiaoNa Ge, Changchun Shen, Zhen Institute of Powder Metallurgy and Advanced Ceramics School of Material Science and Engineering University of Science and Technology Beijing Beijing100083 China State Key Laboratory of Multimodal Artificial Intelligence System Institute of Automation Chinese Academy of Science Beijing100190 China

Highly dense 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramic that harnesses complex geometries with high resolution was additively manufactured. The mainstay of a solid content of 43 vol% on the density, microstructure, and mechanical characteristics was investigated in detail. Experimental findings showed that the solid content and debinding under an argon atmosphere had an unprecedented impact on the structural stability and relative density. The rheological, dispersion, and photocuring characteristics were investigated in terms of polymerization conversion behavior. The highest relative density and open porosity after sintering at 1450 °C for a holding rate of 2h were (96.4%) and 1.94%, respectively. Microstructural analysis confirmed the successful integrated morphology of the DLP prepared homogeneously with an average grain size of 0.48±0.21. Here we report evidence of shrinkage 22.3±0.2, 22.6±0.2, 24.5±0.2, with X, Y and Z direction, nanoindentation hardness of 124.7 GPa and exceptionally high bending strength of 457.76±3.24, and average modulus 378.8 GPa. Used in appropriate process sintering;Vickers hardness (1352.946-MPa), compressive strength of 164.6 MPa were achieved. These results showcase the potential of DLP 3D printing of dense ceramics parts with high performance for structural applications. © 2023, The Authors. All rights reserved.

关键词： Sintering

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Finite element modeling of the shaped charge jet and design of the reusable perforating gun

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Petroleum Science 2020年第5期17卷 1389-1399页

作者： Zhao Zhang Wei-Wei Jin State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsFaculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalian 116024China Institute of Manned Space System Engineering China Academy of Space TechnologyBeijing 100094China

Finite element method is used to study the formations of the penetration jet,the bulge,and the burr in the designed reusable perforating *** attached layer of the soft metal on the perforator is studied for the controlling of the bulge height on the casing of the reusable perforating *** indicate that the shaped charge jet is initially formed in the center of the shaped charge liner and then the material of the liner is driven to the centerline of the liner by the detonation *** attachment of the soft metal layer to the cartridge of the perforator can be beneficial to control the bulge *** design on the blind holes on the casing can affect the burr height formed by the collision between the jet and the *** the increase in the liner angle,the penetration width on the cement wall of the wellbore is increased.

关键词： Perforating gun Finite element method Bulge Burr

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Solid-state Dewetting Structure and Properties Evolution of Pt Films Deposited by Physical Vapour Deposition During Heat Treatment

SSRN

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SSRN 2023年

作者： Chen, Wei Feng, Yingrui Wang, Peng Cui, Qifeng Qiang, Zhiqing Qiao, Li Li, Qinglin School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Lanzhou730000 China Institute of Aerospace System Engineering Shanghai Shanghai201108 China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co.Ltd Shanghai201108 China China

To investigate the correlation between microstructure and thermal stability of Pt film, Pt films were prepared by magnetron sputtering with thicknesses of 50, 200 and 400nm, respectively and annealed up to 1273K in vacuum or ambient atmosphere. The results showed that all three heat-treated Pt films in both environments show progressively more pronounced structures of holes, hillocks, grain agglomerates and even dewed to form low-energy island structures as the temperature increases. Both the dewetting temperature and the size of the island-like structure rise with the increase of film thickness. Due to additional pressure effects in the ambient atmosphere, the average free travel between atoms decreases, and the diffusion ability is weakened, leading to a slowdown in the rate of dewetting. The resistivity of all three Pt films in both environments showed a tendency to decrease and then increase, and they all decreased to the lowest value at 873K. The decrease is due to that atomic diffusion eliminates the lattice defects such as grain boundaries inside the films. The increase in resistivity is due to the enhanced electron scattering effect caused by high temperatures, and excessive temperature leads to dewetting process in the film, agglomeration on the surface of the film also leads to an increase in resistivity. © 2023, The Authors. All rights reserved.

关键词： Heat treatment

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Experimental Study on Electro-Impulse De-Icing of Wind Turbine Blades

Experimental Study on Electro-Impulse De-Icing of Wind Turbi...

引用

Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Tingfan Huang Xingliang Jiang Yu Chen Maozheng Wang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University China

ISBN: (纸本)9781728191591;9781728191607

Wind turbine blades may be ice-covered in winter, which may lead to wind farm outage, resulting in huge social impact and economic damage. At present, there are few technologies and experiences on de-icing of wind turbine blades at home and abroad. According to the characteristics of the fan blade, this paper proposes an electric pulse de-icing method, winding the distributed pulse coil of electric pulse de-icing, and obtaining the reasonable winding of the coil through the measurement and analysis of the coil current waveform. Using COMSOL software to conduct electrodynamic simulation analysis on the aluminum plate, the distribution of the impulse force is obtained. Through the simulation test of the artificial climate chamber, it is shown that the electric pulse technology can effectively remove the ice of the contact rail through the reasonable parameter coordination, and it has the characteristics of fast deicing speed, high efficiency and low energy consumption.

关键词： Fans Surface discharges Blades Aluminum Windings Force Wind farms

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Aerial battlefield targets grouping based on DTW-DBSCAN algorithm

Aerial battlefield targets grouping based on DTW-DBSCAN algo...

引用

第40届中国控制会议

作者： Shao Zhuang Chen Chen School of Automation Beijing Institute of Technology State Key Laboratory of Intelligent Control and Decision of Complex System

Targets grouping is the basis of second-level information fusion,which can effectively assist commanders to make *** aerial targets grouping algorithm only takes the radar acquisition data at the current time as the object and cannot update the clustering results automatically.A grouping method combining dynamic time warping(DTW) and the algorithm Density-Based Spatial Clustering of Applications with Noise(DBSCAN) is *** DTW distance of each attribute historical time-series data is used to measure the similarity between ***,an improved DBSCAN algorithm is used for *** simulation results show that the method has better grouping effect and can automatically cluster regularly.

关键词： targets grouping dynamic time warping density clustering

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