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arXiv 2020年

作者： Wu, Yu-Huan Liu, Yun Zhang, Le Gao, Wang Cheng, Ming-Ming TKLNDST College of Computer Science Nankai University Tianjin300350 China ETH Zurich Switzerland School of Information and Communication Engineering University of Electronic Science and Technology of China China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

Much of the recent efforts on salient object detection (SOD) have been devoted to producing accurate saliency maps without being aware of their instance labels. To this end, we propose a new pipeline for end-to-end salient instance segmentation (SIS) that predicts a class-agnostic mask for each detected salient instance. To better use the rich feature hierarchies in deep networks and enhance the side predictions, we propose the regularized dense connections, which attentively promote informative features and suppress non-informative ones from all feature pyramids. A novel multi-level RoIAlign based decoder is introduced to adaptively aggregate multi-level features for better mask predictions. Such strategies can be well-encapsulated into the Mask R-CNN pipeline. Extensive experiments on popular benchmarks demonstrate that our design significantly outperforms existing state-of-the-art competitors by 6.3% (58.6% vs. 52.3%) in terms of the AP metric. The code is available at https://***/yuhuan-wu/RDPNet. © 2020, CC BY-NC-ND.

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Progressive Inertial Poser: Progressive Real-Time Kinematic Chain Estimation for 3D Full-Body Pose from Three IMU Sensors

arXiv

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arXiv 2025年

作者： Zhu, Zunjie Zhao, Yan Hu, Yihan Wang, Guoxiang Qiu, Hai Zheng, Bolun Yan, Chenggang Xu, Feng School of Communication Engineering Hangzhou Dianzi University Hangzhou323000 China Key Laboratory of Micro-nano Sensing and IoT of Wenzhou Wenzhou Institute of Hangzhou Dianzi University Wenzhou325038 China School of Control Science and Engineering Tiangong University Tianjin300387 China College of Business Lishui University Lishui310018 China Costar Intelligent Optoelectronics Technology Co. Ltd China School of Automation Hangzhou Dianzi University Hangzhou323000 China Faculty of Applied Sciences Macao Polytechnic University 999078 China School of software and BNRist Tsinghua University Beijing100084 China

The motion capture system that supports full-body virtual representation is of key significance for virtual reality. Compared to vision-based systems, full-body pose estimation from sparse tracking signals is not limited by environmental conditions or recording range. However, previous works either face the challenge of wearing additional sensors on the pelvis and lower-body or rely on external visual sensors to obtain global positions of key joints. To improve the practicality of the technology for virtual reality applications, we estimate full-body poses using only inertial data obtained from three Inertial measurement Unit (IMU) sensors worn on the head and wrists, thereby reducing the complexity of the hardware system. In this work, we propose a method called Progressive Inertial Poser (ProgIP) for human pose estimation, which combines neural network estimation with a human dynamics model, considers the hierarchical structure of the kinematic chain, and employs a multi-stage progressive network estimation with increased depth to reconstruct full-body motion in real time. The encoder combines Transformer Encoder and bidirectional LSTM (TE-biLSTM) to flexibly capture the temporal dependencies of the inertial sequence, while the decoder based on multi-layer perceptrons (MLPs) transforms high-dimensional features and accurately projects them onto Skinned Multi-Person Linear (SMPL) model parameters. Quantitative and qualitative experimental results on multiple public datasets show that our method outperforms state-of-the-art methods with the same inputs, and is comparable to recent works using six IMU sensors. Copyright © 2025, The Authors. All rights reserved.

关键词： Virtual reality

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Progressive Inertial Poser: Progressive Real-Time Kinematic Chain Estimation for 3D Full-Body Pose from Three IMU Sensors

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IEEE Transactions on Instrumentation and measurement 2025年 74卷

作者： Zhu, Zunjie Zhao, Yan Hu, Yihan Wang, Guoxiang Qiu, Hai Zheng, Bolun Yan, Chenggang Xu, Feng Hangzhou Dianzi University School of Communication Engineering Hangzhou 323000 China Wenzhou Institute of Hangzhou Dianzi University Key Laboratory of Micro-nano Sensing and IoT of Wenzhou Wenzhou 325038 China Tiangong University School of Control Science and Engineering Tianjin 300387 China Lishui University College of Business Lishui 310018 China Costar Intelligent Optoelectronics Technology Co. Ltd China Hangzhou Dianzi University School of Automation Hangzhou 323000 China Macao Polytechnic University Faculty of Applied Sciences 999078 Macao Tsinghua University School of software and BNRist Beijing 100084 China

关键词： full-body virtual representation IMU sensors kinematic chain motion capture neural network progressive estimation virtual reality

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control method for EV charging and discharging in V2G/V2H scenario based on the synchronvter technology and H∞ repetitive control

Control method for EV charging and discharging in V2G/V2H sc...

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作者： Liu, Dongqi Zeng, Xiangjun Liu, Guorong Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha China College of Electrical and Information Engineering Hunan University Changsha China School of Computer and Communication Hunan Institute of Engineering Xiangtan China

Electric vehicles (EVs) will play a vital role in the future's transportation systems since this technology is promising for environment, energy security, and improved fuel economy. EVs have huge potential of serving as the energy storage for the power grid as well as inhabitants in vehicle-to-grid (V2G) or vehicle-to-house (V2H) scenario. In this study, a control method is proposed for EV charging and discharging by using the synchronverter technology and H∞ repetitive controller, where synchronverter technology is used to generate the reference voltage to decide the power angle and amplitude of the AC side voltage of the charging/discharging port, so that the power flow between EV and the grid is controlled. In order to ensure the power quality of EVs provided for the grid and the load while EVs are with local loads, a H∞ repetitive controller is designed to control the voltage between EVs and the grid to follow the reference voltage. Simulation results have shown that the proposed controller is not only able to realise bi-directional real power and reactive power control, but also keep the output voltage of EVs in V2G or V2H scenario stable and clear while they are with different kinds of local loads. © 2019 Institution of engineering and *** right reserved.

关键词： Fuel economy

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Dual-band nonreciprocal thermal radiation by coupling optical Tamm states in magnetophotonic multilayers

arXiv

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arXiv 2021年

作者： Wu, Jun Wu, Feng Zhao, Tiancheng Antezza, Mauro Wu, Xiaohu Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education College of Electrical Engineering Anhui Polytechnic University Wuhu241000 China School of Optoelectronic Engineering Guangdong Polytechnic Normal University Guangzhou510665 China Beijing Aerospace Institute for Metrology and Measurement Technology Beijing100076 China UMR 5221 CNRS-Universitéde Montpellier MontpellierF-34095 France Institut Universitaire de France 1 rue Descartes Paris Cedex 05F-75231 France Shandong Institute of Advanced Technology Jinan250100 China

Kirchhoff’s law is one of the most fundamental law in thermal radiation. The violation of traditional Kirchhoff’s law provides opportunities for higher energy conversion efficiency. Various micro-structures have been proposed to realize single-band nonreciprocal thermal emitters. However, dual-band nonreciprocal thermal emitters remain barely investigated. In this paper, we introduce magneto-optical material into a cascading one-dimensional (1-D) magnetophotonic crystal (MPC) heterostructure composed of two 1-D MPCs and a metal layer. Assisted by the nonreciprocity of the magneto-optical material and the coupling effect of two optical Tamm states (OTSs), a dual-band nonreciprocal lithography-free thermal emitter is achieved. The emitter exhibits strong dual-band nonreciprocal radiation at the wavelengths of 15.337 μm and 15.731 μm when the external magnetic field is 3 T and the angle of incidence is 56°. Besides, the magnetic field distribution is also calculated to confirm that the dual-band nonreciprocal radiation originates from the coupling effect between two OTSs. Our work may pave the way for constructing dual-band and multi-band nonreciprocal thermal emitters. Copyright © 2021, The Authors. All rights reserved.

关键词： Conversion efficiency

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Local spin-state manipulation of iron single-atom sites induced by sulfur modification to boost Fenton-like reaction

引用

Chinese Chemical Letters 2025年

作者： Lina Zou Dengke Wang Shiqin Lai Xunheng Jiang Siqi Chen Lanqing Deng Dong Fan Hengshuai Li Zhigang Zhou Denglong Chen Xiangyang Yao Jianping Zou National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization Nanchang Hangkong University Nanchang 330063 China College of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China School of Physics Science and Information Technology & Shandong Key Laboratory of Optical Communication Science and Technology Liaocheng University Liaocheng 252000 China Quangang Research Institute of Petrochemical Technology Fujian Normal University Fuzhou 350007 China Fujian Longking New Land Tech Co. Ltd. Fuzhou 350015 China

A strategy based on local spin-state manipulation was achieved through S-modification on single-Fe-atom catalysts (Fe 1 -NSC). Spectral analyses and theoretical calculations elucidated that a medium-spin reconfiguration of Fe species in Fe 1 -NSC endowed an increased orbital overlap between Fe-3d and O-2p, reinforcing the peroxymonosulfate (PMS) dissociation kinetics. Consequently, Fe 1 -NSC delivered excellent performance in PMS conversion and pollutant degradation. The specific activity of PMS activation over Fe 1 -NSC reached 36.1 × 10 -3 L min -1 m -2 , 4.2-folds that of Fe 1 -NC (8.61 × 10 -3 L min -1 m -2 ) and superior to the state-of-the-art catalysts reported to date. Importantly, the atomic spin-state modulation via S-modification can extend to other metals (Mn, Co and Cu) for improved PMS activation with > 3 times higher than those without S-modification. This work provides a universal scheme for electronic configuration regulation and highlights the significance of local environment modulation in designing high-performance catalysts for PMS activation.

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Direct Synthesis of High Silica Ssz-16 Zeolite with Extraordinarily Superior Performance in Nh3-Scr Reaction

SSRN

引用

SSRN 2023年

作者： Han, Shichao Rao, Wei Hu, Junyi Tang, Xiaomin Ma, Ye Du, Jinpeng Liu, Zhongqi Wu, Qinming Ma, Yanhang Meng, Xiangju Shan, Wenpo Xiao, Feng-Shou He, Hong Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan Key Laboratory of Magnetic Resonance in Biological Systems Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China School of Physical Science and Technology Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech University Shanghai201210 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China Key Lab of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou310007 China

The development of Cu ion-exchanged small-pore zeolites with excellent performance and high hydrothermal stability in NH3-SCR reaction is of great importance. However, many frameworks of the small-pore zeolites are Al-rich, for instance, Cu-SSZ-16 zeolite with Si/Al ratio always no more than 5, showing relatively low hydrothermal stability. In this work, inspired by theoretical calculation for the interaction between organic structural directing agents (OSDAs) and zeolite framework, high silica SSZ-16 zeolite with Si/Al ratio at 6.7 was directly synthesized using an economical diquaternary alkylammonium cation as an OSDA. After exchanged with Cu ion, the Cu-SSZ-16 catalyst shows extraordinarily superior performance in NH3-SCR reaction even after hydrothermal aging at 900 °C. The designed synthesis combined with excellent performance as well as high hydrothermal stability of the high silica SSZ-16 zeolite might provide an attractive alternative candidate for NH3-SCR catalyst on diesel vehicles and non-road mobile machinery in the future. © 2023, The Authors. All rights reserved.

关键词： Zeolites

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Dynamical control of Quantum Heat Engines Using Exceptional Points

arXiv

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arXiv 2022年

作者： Zhang, J.-W. Zhang, Jian-Qi Ding, G.-Y. Li, J.-C. Bu, J.-T. Wang, B. Yan, L.-L. Su, S.-L. Chen, L. Nori, F. Özdemir, S.K. Zhou, F. Jing, H. Feng, M. 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 Wuhan430071 China Research Center for Quantum Precision Measurement Guangzhou Institute of Industry Technology Guangzhou511458 China School of Physics University of the Chinese Academy of Sciences Beijing100049 China School of Physics Zhengzhou University Zhengzhou450001 China Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Saitama 351-0198 Japan Physics Department The University of Michigan Ann ArborMI48109-1040 United States Department of Engineering Science and Mechanics Materials Research Institute Pennsylvania State University University Park State College PA16802 United States Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou450002 China

A quantum thermal machine is an open quantum system coupled to hot and cold thermal baths. Thus, its dynamics can be well understood using the concepts and tools from non-Hermitian quantum systems. A hallmark of non-Hermiticity is the existence of exceptional points where the eigenvalues of a non-Hermitian Hamiltonian or an Liouvillian superoperator and their associated eigenvectors coalesce. Here, we report the experimental realisation of a single-ion heat engine and demonstrate the effect of the Liouvillian exceptional points on the dynamics and the performance of a quantum heat engine. Our experiments have revealed that operating the engine in the exact- and broken-phases, separated by a Liouvillian exceptional point, respectively during the isochoric heating and cooling strokes of an Otto cycle produces more work and output power and achieves higher efficiency than executing the Otto cycle completely in the exact phase where the system has an oscillatory dynamics and higher coherence. This result opens interesting possibilities for the control of quantum heat engines and will be of interest to other research areas that are concerned with the role of coherence and exceptional points in quantum processes and in work extraction by thermal *** Codes 80A05, 37B55, 81P40 © 2022, CC BY.

关键词： Otto cycle

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Calibration and orientation of industrial online photogrammetry systems in situ

Calibration and orientation of industrial online photogramme...

引用

7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Sun, Peng Lu, Naiguang Dong, Mingli Wang, Jun Yan, Bixi Institute of Information Photonics and Optical Communication Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory: Measurement and Control of Mechanical Electrical System Beijing Information Science and Technology University Beijing China School of Instrument Science and Optoelectronics Engineering Beijing Information Science and Technology University Beijing China

This study proposes an analytical method for calibrating and orienting online photogrammetric systems using a scale bar. The primary idea is building control lengths in the measurement volume by moving and rotating the scale bar and then conducting a self-calibration bundle adjustment using images of the control lengths. In this study, the five-point relative orientation method is used to provide estimations of the exterior camera parameters. Additionally, this study elaborates the model of the lengths constrained self-calibration bundle adjustment, the block computation algorithm and the accuracy assessment. This method obtains both the interior and the exterior orientation parameters of the two cameras, and provides spatial bar length reconstruction precision as the performance evaluation. Simulations are conducted to analyze the calibration accuracy and the results show that the method achieves comparable accuracy and precision against the state-of-the-art method. However, the method does not need steady and well distributed 3D points and is easy to operate. Real data experimental results show that the maximum length measurement error of this method in a volume of 5 m × 4 m × 2 m is © 2019 Institution of engineering and technology. All rights reserved.

关键词： Photogrammetry

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Highly efficient storage of cavity SPDC single photons in room temperature gradient echo memory

APL Quantum

引用

APL Quantum 2024年第3期1卷

作者： Anthony C. Leung W. Y. Sarah Lau Aaron D. Tranter Karun V. Paul Markus Rambach Ben C. Buchler Ping Koy Lam Andrew G. White Till J. Weinhold ARC Centre of Excellence for Quantum Computation and Communication Technology Sydney NSW 2052 Australia Department of Quantum Science and Technology Research School of Physics The Australian National University Acton ACT 2601 Australia Quantum Measurement Lab Blackett Laboratory Imperial College London London SW7 2BW United Kingdom ARC Centre of Excellence for Engineered Quantum Systems Brisbane QLD 4072 Australia School of Maths and Physics University of Queensland Brisbane QLD 4072 Australia Institute of Materials Research and Engineering Agency for Science Technology and Research (ASTAR) 2 Fusionopolis Way 08-03 Innovis 138634 Singapore

Efficient quantum memories will be an essential building block of large-scale networked quantum systems and provide a link between flying photonic qubits and atomic or quasi-atomic local quantum processors. Memory efficiencies above 50% are required to be operating above the quantum no-cloning limit. High efficiency operation necessitates tailored photon source and memory pairs with matched bandwidths. In this paper, we explore the combination of an ultralow spectral bandwidth source of single photons from cavity-enhanced spontaneous parametric down-conversion with a hot gas-ensemble atomic memory. Our rubidium vapor gradient echo memory achieves 84% ± 3% recall efficiency of single photons: a record for single photon storage in a warm vapor platform that avoids bulky and complex systems, such as high vacuum and low temperature cryogenics.

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