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FGF3D: A Point Cloud 3D Object Detection Algorithm Based on Fine-Grained Feature Fusion

IEEE Transactions on Instrumentation and measurement 2025年

作者： Li, Bing Xu, Yunheng Wang, Shuoheng Wang, Xinwen Chen, Jie Li, Xinde Li, Yingsong Huang, ZhiXiang Anhui University School of Electronic and Information Engineering Hefei230601 China Southeast University School of Automation Nanjing210096 China Nanjing Center for Applied Mathematics Nanjing211135 China Anhui University Information Materials and Intelligent Sensing Laboratory of Anhui Province Hefei230601 China 38th Research Institute of China Electronics Technology Group Corporation Hefei230088 China Southeast University Key Laboratory of Measurement and Control of CSE School of Automation Nanjing210096 China Southeast University Shenzhen Research Institute Shenzhen518063 China

In the existing two-stage point cloud 3D object detection task, there are problems such as the lack of fine-grained and insufficient sparsity of point cloud features extracted by the backbone network, the lack of spatial-channel fine-grained fusion of bird-eye-view (BEV) features, and the lack of multi-dimensional representation of ROI pooling features. We innovatively propose a new two-stage algorithm based on fine-grained feature fusion, called FGF3D. We construct a sparsegrained aggregation network (SGANet) to elevate the representation of point cloud features. Furthermore, we innovatively propose a spatial-channel fine-grained fusion module (SCFFM) to enrich BEV features and efficiently extract fine-grained features. Further, we propose a global-local feature pooling fusion module (GLFP), which effectively fuses local detail object features and global features, enhances multi-dimensional representations, and facilitates the refined regression of proposal boxes. Without bells and whistles, FGF3D attains excellent performance on two autonomous driving benchmarks, with detection accuracies of up to 64.10% on KITTI, 57.82% on ONCE. © 2025 IEEE. All rights reserved.

关键词： Object detection

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Analysis and Design of Terahertz Reconfigurable Reflectarray Element

Analysis and Design of Terahertz Reconfigurable Reflectarray...

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Qian Song Xiaotian Pan Fan Yang Lin Peng Shenheng Xu Maokun Li Department of Electronic Engineering Tsinghua University Beijing China Beijing Institute of Radio Measurement Beijing China State Key Laboratory of Mobile Network and Mobile Multimedia Technology ZTE Corporation Shenzhen China

ISBN: (纸本)9781665482271

Terahertz reconfigurable reflectarray elements designed with high electron mobility transistor (HEMT) technology are presented in this paper. It consists of a dipole antenna, a phase shifter with HEMT, and a biasing circuit to realize 1-bit phase quantization (0° /180°). The phase shifter circuit is controlled using a HEMT switch integrated in the dipole. In order to improve the switch ratio of the HEMT, a compensated inductive transmission line is connected in parallel or series with the HEMT. Corresponding array elements are designed to demonstrate the validity of this approach leading to a 180° phase change.

关键词： Phased arrays Millimeter wave transistors Quantization (signal) Power transmission lines Phase shifters Millimeter wave technology Switches

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Using macroscopic dynamics to study the effects of multiple factors to wear evolution mechanism

Using macroscopic dynamics to study the effects of multiple ...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2024)

作者： Bowen Jia Shixun Pei Ziyu Hu Yuhang Chen Wei Hong MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan People's Republic of China School of Aero-engine Engineering Zhengzhou University of Aeronautics Zhengzhou 450046 People's Republic of China School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan 430074 People's Republic of China CYG Sunri Co. Ltd. Shenzhen People's Republic of China

ISBN: (数字)9781837242108

The occurrence of wear in mechanical systems is inevitable and the degree of wear on friction pairs of key components almost determines the life of mechanical equipment. Although the wear of friction pairs has been proven to follow the bathtub curve pattern, evolution mechanism is still unclear. Based on the linear damage mechanism at macroscopic time scale, this paper models the macroscopic dynamics by abstracting state variables of loss power, friction pair and debris characteristics. Furthermore, wear evolution mechanism is studied by Monte Carlo simulation within a reasonable range of parameters. The results show that wear mass action coefficient, wear mean and standard deviation action coefficient, and power factor coefficient of different wear types can affect the evolution direction of system. The reasonable combination of multiple factors can achieve reduction in power loss, decline in roughness of friction pair and decrease in the growth rate of debris mass. This study reveals the effects of multiple factors on the evolution of wear system from the macro level, which is of great significance for diagnosing equipment faults and prolonging mechanical life.

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Reduced Firing of Nucleus Accumbens Parvalbumin Interneurons Impairs Risk Avoidance in DISC1 Transgenic Mice

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Neuroscience Bulletin 2021年第9期37卷 1325-1338页

作者： Xinyi Zhou Bifeng Wu Wenhao Liu Qian Xiao Wei He Ying Zhou Pengfei Wei Xu Zhang Yue Liu Jie Wang Jufang He Zhigang Zhang Weidong Li Liping Wang Jie Tu Guangdong Provincial Key Laboratory of Brain Connectome and Behavior CAS Key Laboratory of Brain Connectome and Manipulationthe Brain Cognition and Brain Disease InstituteShenzhen-Hong Kong Institute of Brain ScienceShenzhen Fundamental Research InstitutionsShenzhen Institute of Advanced TechnologyChinese Academy of Sciences518055 ShenzhenChina University of Chinese of Academy of Sciences Beijing 100049China Department of Information Technology and Electrical Engineering Zurich Swiss Federal Institute of Technology Zurich8092 ZurichSwitzerland Department of Biomedical Sciences City University of Hong KongKowloon TongHong Kong Virginia Polytechnic Institute and State University BlacksburgVirginia 24061USA Department of Psychiatry and Behavioral Sciences Emory University School of MedicineAtlanta 30322USA Bio-X Institutes Key Laboratory for the Genetics of Development and Neuropsychiatric Disorders(Ministry of Education)Shanghai Key Laboratory of Psychotic Disordersand Brain Science and Technology Research CenterShanghai Jiao Tong UniversityShanghai 200240China Center of Brain Science State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsInnovation Academy for Precision Measurement Science and TechnologyNational Center for Magnetic Resonance in WuhanKey Laboratory of Magnetic Resonance in Biological SystemsWuhan Institute of Physics and MathematicsChinese Academy of Sciences430071 WuhanChina Department of Neuroscience City University of Hong KongKowloon TongHong Kong City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

A strong animal survival instinct is to approach objects and situations that are of benefit and to avoid *** humans,a large proportion of mental disorders are accompanied by impairments in risk *** of the most important genes involved in mental disorders is disrupted-in-schizophrenia-1(DISC1),and animal models in which this gene has some level of dysfunction show emotion-related ***,it is not known whether DISC1 mouse models have an impairment in avoiding potential *** the present study,we used DISC1-N terminal truncation(DISC1-N^(TM))mice to investigate risk avoidance and found that these mice were impaired in risk avoidance on the elevated plus maze(EPM)and showed reduced social preference in a three-chamber social interaction *** EPM tests,c-Fos expression levels indicated that the nucleus accumbens(NAc)was associated with risk-avoidance behavior in DISC1-N^(TM)*** addition,in vivo electrophysiological recordings following tamoxifen administration showed that the firing rates of fast-spiking neurons(FS)in the NAc were significantly lower in DISC1-N^(TM)mice than in wild-type(WT)*** addition,in vitro patch clamp recording revealed that the frequency of action potentials stimulated by current injection was lower in parvalbumin(PV)neurons in the NAc of DISC1-N^(TM)mice than in WT *** impairment of risk avoidance in DISC1-N^(TM)mice was rescued using optogenetic tools that activated NAcPV ***,inhibition of the activity of NAcPV neurons in PV-Cre mice mimicked the risk-avoidance impairment found in DISC1-N^(TM)mice during tests on the elevated zero *** together,our findings confirm an impairment in risk avoidance in DISC1-N^(TM)mice and suggest that reduced excitability of NAc^(PV) neurons is responsible.

关键词： DISC1 Risk avoidance Parvalbumin Nucleus accumbens

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Oil contaminant detection based on differential capacitance

Oil contaminant detection based on differential capacitance

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2024)

作者： Xiaohui Jin Shixun Pei Yuanhang Chen Wei Hong MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan People's Republic of China School of Aero-engine Engineering Zhengzhou University of Aeronautics Zhengzhou 450046 People's Republic of China CYG Sunri Co. Ltd. Shenzhen People's Republic of China

ISBN: (数字)9781837242108

Oil contaminant detection is of great significance for machine fault diagnosis. However, in practical environments, there are complex electromagnetic interferences that greatly reduce the sensitivity of detection. In this paper, a capacitive oil contaminant detection method based on the differential principle is proposed. Firstly, the mathematic model of the differential capacitance principle is derived. Then, the electrode structure for contaminant detection is designed, and the detection principle is verified through physical field simulation. Finally, the feasibility of the differential capacitance detection is experimentally validated. The experimental results show that the detection method based on the differential capacitance principle can effectively suppress environmental interferences and detect sub-millimetre bubbles, which demonstrate the potential for practical applications.

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Defects Localization Using the Data Fusion of Laser Doppler and Image Correlation Vibration measurements

SSRN

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SSRN 2022年

作者： Sheng, Zhipeng Zhang, Kun Ge, Zhendong Yuan, Yingtao Chen, Bing Yan, Keyu Fu, Yu Yu, Qifeng Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection College of Physics and Optoelectronic Engineering Shenzhen University 3688 Nanhai Avenue Shenzhen518060 China Graduate School of Environmental Science and Technology Mie University Tsu514-0001 Japan School of Aeronautics Northwestern Polytechnical University Xi'An710072 China

This work proposes a defects localization method based on the combination of laser Doppler vibrometry (LDV) and Digital image correlation (DIC). DIC and LDV are the dominant non-contact vibration measurement methods with a matured theory and high stability. DIC gives a high spatial resolution with a measurement accuracy of several microns, whereas the Multipoint LDV has a limited spatial resolution with high-precision results for the sparse points up to nanometer level. However, the vibration-based defects localization necessitates certain measurement methods with both the high spatial resolution and measurement accuracy. Unfortunately, the resolution of DIC is not sufficient to detect the data anomalies caused by the structural defects. Nevertheless, LDV cannot achieve a high-precision defect localization owing to the limited spatial resolution. In this study, a nonlinear weighted least-squares fitting has been proposed to improve the measurement accuracy and reliability. A Chebyshev polynomial has been employed as the basis function in the fitting process. The effective signal-to-noise ratio (SNR) and the correlation coefficient are employed as the weight basis of the LDV points and the DIC subsets, respectively. Based on the simulation analysis, the determination of the optimal polynomial order at multiple noise levels and the influence of the LDV points distribution are discussed. The experiment proves that the data fusion method can significantly improve the spatial resolution and measurement accuracy. From the data fusion results, the reference-free defects localization in a cantilever beam and rectangular plate based on residuals have been presented. © 2022, The Authors. All rights reserved.

关键词： Vibration measurement

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Research on the Evolution Mechanism of Friction Wear Based on Macroscopic Dynamics

SSRN

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SSRN 2024年

作者： Jia, Bowen Pei, Shixun Yang, Fangchao Li, Honggang Chen, Bingxue Zhao, Menghao Chen, Yuanhang Wang, Liang Hong, Wei MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF School of Physics Huazhong University of Science and Technology Wuhan430074 China School of Aero-engine Engineering Zhengzhou University of Aeronautics Zhengzhou450046 China Intelligent Computing Hardware Center Zhejiang Lab Hangzhou311121 China CYG Sunri Co. Ltd. Shenzhen518057 China

This paper models the macroscopic dynamics of wear based on the linear damage mechanism, abstracting state variables of loss power, friction pair characteristics and debris characteristics. The wear evolution trend is then analyzed from system stability perspective by the Routh criterion. Furthermore, wear evolution mechanism is studied by Monte Carlo simulation within reasonable parameter ranges. Finally, the effects of multiple factors on wear evolution are analyzed by critical parameter perturbation. The results show that the action and correlation coefficients between the state variables would influence the evolution direction of friction wear. The reasonable combination of these parameters can effectively reduce loss power, decrease roughness and fluctuation of friction pairs, and slow growth rate of debris mass. © 2024, The Authors. All rights reserved.

关键词： Wear of materials

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Efficient phosphonate degradation by Ti4O7 electrode under realistic conditions: Key contribution of HOCl and long-term stability

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Chemosphere 2025年 384卷 144510页

作者： Lingyu He Jiayu Luo Haiyang Hu Xin Zhang Yang Lei Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks School of Environmental Science and Engineering Southern University of Science and Technology (SUSTech) Shenzhen 518055 China. Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks School of Environmental Science and Engineering Southern University of Science and Technology (SUSTech) Shenzhen 518055 China. Electronic address: leiy3@***.

Using phosphorus-containing scale inhibitors (i.e., phosphonates) in cooling water poses a significant challenge to water pollution and eutrophication during discharge. Here we report an efficient electrochemical oxidation (EO) process based on a low-cost titanium suboxide (TiO) inert anode. We found that ubiquitous chloride ions (Cl) in cooling water significantly promoted the transformation of methylene phosphonic acid (NTMP, a representative phosphonate) into orthophosphate. In the Cl-TiO-AO system, hypochlorous acid (HOCl) is the primary reactive species responsible for the sequential cleavage of C-P and C-C bonds, converting organic phosphorus into inorganic phosphate. Furthermore, the presence of HCO or humic acid (HA) under realistic conditions showed negligible effects on the degradation of NTMP. In long-term operation, the TiO-AO system sustained 100% conversion efficiency of NTMP over continuous-flow operation mode for more than 720 h, even though the cathode was almost entirely covered with CaCO deposits. The results revealed that cathode scaling does not profoundly affect the conversion of organic phosphorus to phosphate in the TiO-AO system. Overall, our study elucidates the mechanism and robust efficiency of the Cl-TiO-AO system in treating phosphonate-laden wastewater and offers a new solution for dealing with cooling water by coupling electrochemical oxidation with ubiquitous chloride ions.

关键词： Anodic oxidation Cooling water HOCl Organic phosphorus compounds Ti(4)O(7)

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Coexistence of Ferroelectriclike Polarization and Dirac-like Surface State in TaNiTe5

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Physical Review Letters 2022年第10期128卷 106802-106802页

作者： Yunlong Li Zhao Ran Chaozhi Huang Guanyong Wang Peiyue Shen Haili Huang Chunqiang Xu Yi Liu Wenhe Jiao Wenxiang Jiang Jiayuan Hu Gucheng Zhu Chenhang Xu Qi Lu Guohua Wang Qiang Jing Shiyong Wang Zhiwen Shi Jinfeng Jia Xiaofeng Xu Wentao Zhang Weidong Luo Dong Qian Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 211189 China Key Laboratory of Quantum Precision Measurement of Zhejiang Province Department of Applied Physics Zhejiang University of Technology Hangzhou 310023 China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China

By combining angle-resolved photoemission spectroscopy, scanning tunneling microscopy, atomic force microscope based piezoresponse force microscopy and first-principles calculations, we have studied the low-energy band structure, atomic structure, and charge polarization on the surface of a topological semimetal candidate TaNiTe5. Dirac-like surface states were observed on the (010) surface by angle-resolved photoemission spectroscopy, consistent with the first-principles calculations. On the other hand, piezoresponse force microscopy reveals a switchable ferroelectriclike polarization on the same surface. We propose that the noncentrosymmetric surface relaxation observed by scanning tunneling microscopy could be the origin of the observed ferroelectriclike state in this novel material. Our findings provide a new platform with the coexistence of a ferroelectriclike surface charge distribution and novel surface states.

关键词： Ferroelectricity Surface states Surfaces Topological materials Angle-resolved photoemission spectroscopy Piezoresponse force microscopy

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Robust three-qubit search algorithm in Rydberg atoms via geometric control

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Physical Review A 2022年第5期106卷 052610-052610页

作者： Bing-Bing Liu Zheng Shan M.-R. Yun D.-Y. Wang B.-J. Liu L.-L. Yan M. Feng S.-L. Su Key Laboratory of Material Physics Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001 Henan China Department of Physics Southern University of Science and Technology Shenzhen Guangdong 518055 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy of Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 China Research Center for Quantum Precision Measurement Guangzhou Institute of Industry Technology Guangzhou 511458 China Department of Physics Zhejiang Normal University Jinhua 321004 China

Rydberg atoms possess long coherence time and inherent scalability, which makes it promising to implement quantum algorithms. An exact and robust quantum search algorithm (SA) is essential to some practical applications. Here we propose a multisolution three-qubit SA by employing quantum circuit and geometric operations, in which the target states can be successfully searched with the fidelity of at least 99.8% and the geometric operators guarantee robustness against systematic errors. In particular, the geometric three-qubit gate operators employed reduce the implementation time and help to resist against the detrimental influence of decoherence. Moreover, our scheme can be straightforwardly extended to multiqubit cases. We have carried out numerical simulations based on the master equation to illustrate the superiority of our scheme. We consider that our study provides an alternative method for executing quantum SAs with high success probability.

关键词： Geometric & topological phases Optimization problems Quantum algorithms Rydberg atoms & molecules

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