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Arbitrary acoustic orbital angular momentum detection using dual-layer metasurfaces

science China(physics,Mechanics & Astronomy) 2024年第6期67卷 106-112页

作者： Zhanlei Hao Haojie Chen Yuhang Yin Shan Zhu Yadong Xu Cheng-Wei Qiu Huanyang Chen Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Department of Mechanical and Electrical Engineering Xiamen UniversityXiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China School of Physical Science and Technology and Jiangsu Key Laboratory of Thin Films Soochow UniversitySuzhou 215006China

Orbital angular momentum(OAM),with its unique physical properties and vast application prospects,has attracted widespread attention in various ***,the development of valid and practical acoustic OAM detection methods continues to be a challenging *** this paper,we propose a novel construction method of dual-layer metasurfaces to achieve a doubleconversion process for the waveform reshaping and differentiated focusing of two-dimensional vortex sources with different ***,by utilizing a concise formula,a one-to-one correspondence is established between the OAM of incident vortex waves and different imaging *** fundamental principle of this special conversion relationship is rigorously constrained by the directional compensation of phase and the material parameters of dual-layer metasurfaces with different quadratic phase *** importantly,the highly consistent results between numerical demonstrations and acoustic experiments further confirm the feasibility and effectiveness of the proposed OAM detection *** work provides a new perspective on the precise manipulation for the phase of vortex fields,holding potential applications in super-resolution imaging and the design of acoustic OAM-based devices.

关键词： arbitrary acoustic OAM detection vortex waves dual-layer metasurfaces waveform reshaping differentiated focusing acoustic experiments

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High-dimensional nonlinear variable separation solutions and novel wave excitations for the(4+1)-dimensional Boiti-Leon-Manna-Pempinelli equation

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Communications in Theoretical physics 2024年第11期76卷 1-11页

作者： Zu-feng Liang Xiao-yan Tang Wei Ding Department of Physics Hangzhou Normal UniversityHangzhou 310036China School of Mathematical Sciences Key Laboratory of Mathematics and Engineering Applications(Ministry of Education)&Shanghai Key Laboratory of PMMPEast China Normal UniversityShanghai 200241China School of Computer Science and Technology Shanghai Normal UniversityShanghai 200234China

Considering the importance of higher-dimensional equations that are widely applied to real nonlinear problems,many(4+1)-dimensional integrable systems have been established by uplifting the dimensions of their corresponding lower-dimensional integrable ***,an integrable(4+1)-dimensional extension of the Boiti-Leon-Manna-Pempinelli(4DBLMP)equation has been proposed,which can also be considered as an extension of the famous Korteweg-de Vries equation that is applicable in fluids,plasma physics and so *** is shown that new higher-dimensional variable separation solutions with several arbitrary lowerdimensional functions can also be obtained using the multilinear variable separation approach for the 4DBLMP *** addition,by taking advantage of the explicit expressions of the new solutions,versatile(4+1)-dimensional nonlinear wave excitations can be *** an illustration,periodic breathing lumps,multi-dromion-ring-type instantons,and hybrid waves on a doubly periodic wave background are discovered to reveal abundant nonlinear structures and dynamics in higher dimensions.

关键词： (4+1)-dimensional Boiti-Leon-Manna-Pempinelli equation variable separation solution periodic breathing lumps multi-dromion-ring-type instanton hybrid waves on a doubly periodic wave background

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The Effect of Number Plate Layout and Design on Automated Recognition

The Effect of Number Plate Layout and Design on Automated Re...

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2022 IEEE International Carnahan Conference on Security Technology, ICCST 2022

作者： Gurney, Robert Rhead, Michael Martin, William E University of Hertfordshire School of Engineering Physics and Computer Science Hatfield United Kingdom

This paper considers the implications of adding unnecessary markings to vehicle registration plates following the enactment of The Road Vehicles (Display of Registration Marks) (Amendment) (EU Exit) (No. 2) Regulation... 详细信息

ISBN: (数字)9781665493635

ISBN: (纸本)9781665493635

关键词： Roads and streets

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Research on transient response optimization of fiber optic seismic sensor targeting oil and gas field exploration 4

Research on transient response optimization of fiber optic s...

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4th International Computational Imaging Conference, CITA 2024

作者： Tang, Guitao Li, Dongqing Zhou, Xinghong Yi, Duo Liu, Fei College of Physics and Optoelectronic Engineering Shenzhen Key Laboratory of Sensor Technology Shenzhen University Shenzhen518060 China School of Computer and Communication Engineering University of Science and Technology Beijing Beijing100083 China

ISBN: (纸本)9781510688834

The current research relating to the fiber optic seismic sensor (FOSS) mainly focuses on optimizing its steady-state characteristic parameters including sensitivity, cross-sensitivity and operating bandwidth etc., while there are few studies on its transient response characteristics. In this study, we discuss the transient response improvement of the FOSS in both laboratory platform and oilfield. In the laboratory platform, the ball-falling process is used to simulate the perforation shot signal during down-hole seismic monitoring, and the transient response between the FOSS and the commercial piezoelectric sensor has been compared in both time and frequency domain. Besides, two different types of balls (steel and cotton) are used to verify the transient response performance of the presented FOSS when retrieving different types of signals. The experimental results demonstrate that correlation coefficients as high as 90% are obtained within the frequency range 0~3000 Hz for two ball-falling processes. Finally, the presented FOSS has been used for detecting the perforation shot signal in the oilfield, the comparative analyses based on the key parameters including taking off time and attenuation constant also confirm the transient response optimization of the presented sensor, which is beneficial to improve the acquisition accuracy of seismic signal. © 2025 SPIE.

关键词： Gas industry

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A dynamic displacement map based on deep Q-network to assist the rendering of stylised 3D models

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International Journal of Wireless and Mobile Computing 2023年第3-4期24卷 226-234页

作者： Zheng, Hao Yang, Houqun Huang, Mengshi Wang, Yizhen School of Computer Science and Technology Hainan University Haikou Hainan China School of Computing and Artificial Intelligence Southwest Jiaotong University Chengdu Sichuan China College of Physics and Electronic Engineering Hainan Normal University Haikou Hainan China

In the process of rendering with NPR, there will often be a problem of reduced perception of the NPR effect caused by the fixed spatial structure of the static mesh. Therefore, this research first establishes a convolutional neural network to conduct supervised training on numerous hand-drawn target stylised images, and perform continuous angle recognition through stylised images then output its angle vector. Secondly, the displacement map is generated in realtime by inputting the observation angle through the fully connected neural network model. After that, the real-time displacement map is sampled to dynamically generate the deformation of the model. In the end, the goal of breaking the model's sense of space and enhancing the NPR rendering effect can be achieved. Besides, the experimental results of this study verify the effectiveness of the method. © 2023 Inderscience Enterprises Ltd.

关键词： Neural network models

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Ultrafast magneto-optical dynamics in nickel(111)single crystal studied by the integration of ultrafast reflectivity and polarimetry probes

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Chinese physics B 2024年第3期33卷 65-69页

作者：匡皓余军潇陈洁 H.E.Elsayed-Ali 李润泽 Peter M.Rentzepis School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China Center for Ultrafast Science and Technology Key Laboratory for Laser Plasmas (Ministry of Education)Collaborative Innovation Center of IFSA (CICIFSA)School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Department of Electrical and Computer Engineering Old Dominion UniversityNorfolkVirginia 23529USA Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTexas 77843USA

With the integration of ultrafast reflectivity and polarimetry probes,we observed carrier relaxation and spin dynamics induced by ultrafast laser excitation of Ni(111)single *** carrier relaxation time within the linear excitation range reveals that electron-phonon coupling and dissipation of photon energy into the bulk of the crystal take tens of *** the other hand,the observed spin dynamics indicate a longer time of about 120 *** further understand how the lattice degree of freedom is coupled with these dynamics may require the integration of an ultrafast diffraction probe.

关键词： ultrafast spin dynamics non-equilibrium dynamics multi-probe

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SASHA: A Shift-Add Segmented Hybrid Approximated Multiplier for Image Processing 5

SASHA: A Shift-Add Segmented Hybrid Approximated Multiplier ...

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5th International Conference on Intelligent Systems and computer Vision, ISCV 2022

作者： Rehman, Sabeeh Abdul Jeffrey, Zoe Sun, Yichuang Simpson, Oluyomi University of Hertfordshire School of Physics Engineering and Computer Science Hatfield United Kingdom

ISBN: (纸本)9781665495585

In this paper, a new shift-add segmented hybrid approximated (SASHA) multiplier for image processing applications is proposed. The new multiplier uses segmentation to achieve high performance in power reduction and accuracy of results. It segments the operands and most significant bits. Three hardware implementations of the 2-bit, 4-bit and 6-bit SASHA approximate multiplier are presented in this paper. The power consumption and accuracy of the proposed multipliers are evaluated by comparing performance with non-approximated multipliers using different design parameters. Experimental results show that the accuracy in terms of mean relative error percentage of 2-bit, 4-bit and 6-bit SASHA have minimum impact on the performance of image processing applications such as edge detection of an image. Additionally, a reduction of signal and logic power consumption is observed. © 2022 IEEE.

关键词： Adders

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Free-form acoustic topological waveguides enabled by topological lattice defects

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Physical Review B 2024年第18期109卷 L180101-L180101页

作者： Yin Wang Yong Ge Yu-Jing Lu Shuai Gu Yi-Jun Guan Qiao-Rui Si Shou-Qi Yuan Qiang Wang Hong-Xiang Sun Haoran Xue Research Center of Fluid Machinery Engineering and Technology School of Physics and Electrical Engineering School of Computer Science and Communication Engineering School of Physics Collaborative Innovation Center of Advanced Microstructures State Key Laboratory of Acoustics Department of Physics The

The emerging field of topological acoustics provides exciting possibilities for controlling sound propagation with extraordinary robustness. Conventional topological acoustic waveguides built from topological edge states, which arise solely from the nontrivial topology in the momentum space, usually have restricted shapes due to their crystalline structures. Here, we show that, using an acoustic topological system with both nontrivial topologies in the real and momentum spaces, free-form acoustic topological waveguides can be constructed. These topological waveguides support disclination-localized states, caused by the interplay between topological lattice defects and the valley-Hall topology. As demonstrated in our simulations and experiments, such disclination waveguides can take arbitrary shapes and form open arcs within the lattice, which are not possible for previous crystalline acoustic topological waveguides. Furthermore, by increasing the number of topological lattice defects, we can realize more than one topological waveguide in one lattice. They join at the topological lattice defect and form a topological waveguide network, enabling more complicated functionalities such as beam splitting. Our results point to a promising direction for free-form acoustic topological devices with the advantages of embedded forms, easy cascading, and high robustness.

关键词： Acoustics Defects Topological phase transition Topological phases of matter

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DROO-C Data Transfer in a Mobile Edge Computing Offloading Framework 13

DROO-C Data Transfer in a Mobile Edge Computing Offloading F...

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13th International Conference on Communication and Network Security, ICCNS 2023

作者： Chen, Da Zan, Feng Biao Liu, Xin Meng, Xuan College of Physics and Electronic Information Engineering Qinghai University for Nationalities China School of Computer Science Qinghai University for Nationalities China

ISBN: (纸本)9798400707964

To solve the problem of transmitting information in wireless-driven Vehicular Networking, Mobile Edge Computing (MEC) becomes an effective method to enhance the data transmission capability in fast fading channel conditions under multi-threaded interactions of different nodes in Vehicular Networking. In order to solve the efficiency problem of data transmission in Vehicular Networking under strong time-varying conditions, this paper proposes a deep neural network-based DROO - C computational offloading framework, which divides the MEC environment with complex network topology problems into two sub-problems of task offloading decision making and task data updating by the Mixed-Integer-Planning (MIP) method, where the deep neural network serves as a continuous iterative decision making scheme to optimize the data transmission in the constant The deep neural network is used as a continuous iterative decision-making scheme to optimize the parameters of data transmission in the continuous update training, and the final result is obtained by weighting and calculating the rate, and finally the lossless compression of entropy reduction transformation compresses the transmission data optimized by the DROO - C framework, which maximally improves the data transmission rate between nodes and reduces the transmission time. © 2023 ACM.

关键词： Telematics

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Overview of Reversible Data Hiding for JPEG Images 15th

Overview of Reversible Data Hiding for JPEG Images

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15th International Conference on Genetic and Evolutionary Computing, ICGEC 2023

作者： Zhang, Tiancong Z. Chen, Wei Zhang, Chunyu-Y. Chu, Shu-Chuan School of Electronic Electrical Engineering and Physics Fujian University of Technology Fuzhou350118 China College of Information Engineering Xizang Minzu University Xianyang712082 China College of Computer Science and Engineering Shandong University of Science and Technology Shandong China

ISBN: (纸本)9789819700677

Reversible data hiding for JPEG images have been widely investigated and a large number of related works have been proposed. In this paper, the existing RDH methods for JPEG images are categorized into three types: quantization table modification, Huffman table modification and modification of quantized DCT coefficients. Type III methods are further summarized three classes: single histogram modification, two-dimensional histogram, and two-dimensional histogram (2DH) plus multiple histogram modification (MHM). In addition, we also give a simple introduction for several methods belonging to Type III. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Graphic methods

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