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Reconstructions of time-evolving sound-speed fields perturbed by deformed and dispersive internal solitary waves in shallow water

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Chinese Physics B 2023年第12期32卷 404-415页

作者：李沁然孙超谢磊黄晓冬 School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of Underwater Information Technology Xi'an 710072China Qingdao Research Institute Northwestern Polytechnical UniversityQingdao 266200China Frontier Science Center for Deep Ocean Multispheres and Earth System and Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China Key Laboratory of Ocean Observation and Information of Hainan Province and Sanya Oceanographic Institution Ocean University of ChinaSanya 572024China Laoshan Laboratory Qingdao 266237China

The high-fidelity reconstruction of sound speeds is crucial for predicting acoustic propagation in shallow water where internal solitary waves(ISWs)are *** temperatures from time series to spatial fields is an approach widely used to reproduce the sound speed perturbed by deformed internal ***,wave-shape distortions are inherent in the modeling *** paper analyzes the formation mechanism and dynamic behavior of the distorted waveform that is shown to arise from the mismatch between the modeled and real propagation speeds of individual solitons within an ISW *** mitigate distortions,a reconstruction method incorporating the dispersion property of an ISW train is proposed *** principle is to assign each soliton a real speed observed in the ***,the modeled solitons propagate at their intrinsic speeds,and the packet disperses naturally with *** method is applied to reconstruct the sound speed perturbed by ISWs in the South China *** mean and median of the root-mean-square error between the reconstructed and measured sound speeds are below 2 m/*** modeled shape deformations and packet dispersion agree well with observations,and the waveform distortion is reduced compared with the original *** work ensures the high fidelity of waveguide-environment reconstructions and facilitates the investigation of sound propagation in the future.

关键词： internal solitary wave deformation dispersion sound speed

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An efficient retrieval of relational database information based on knowledge graph

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International Journal of information and Communication technology 2023年第3期23卷 201-214页

作者： Zhu, Hongqin Jiangxi Engineering Technology Research Center of Nuclear Geoscience Data Science and System East China University of Technology Jiangxi Nanchang330013 China Department of Information Engineering East China University of Technology 418 Guanglan Avenue Jiangxi Province Nanchang330013 China

In order to optimise the effect of database information retrieval and overcome the problem of high index cost of traditional retrieval methods, an efficient retrieval design method of relational database based on knowledge graph is designed in this paper. Firstly, the distribution model of database information retrieval nodes is constructed to analyse the data structure, and the semantic characteristics of stored data of retrieval nodes are fused. Then the knowledge graph model analysis method is used to retrieve the database node attribute clustering and adaptive scheduling to realise the design of efficient information retrieval model for the database. The experimental results show that the index distance cost of this method is always below 5 × 1,010 byte, and the index distance cost is always below 40 s, which has certain application value. © 2023 Inderscience Enterprises Ltd.

关键词： information retrieval

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Two-Dimensional Gap Solitons in Parity-Time Symmetry Moiré Optical Lattices with Rydberg–Rydberg Interaction

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Chinese Physics Letters 2023年第4期40卷 28-33页

作者：黎斌斌赵元徐四六周勤傅其栋叶芳伟花春波陈懋薇胡恒洁周倩倩邱章才 School of Biomedical Engineering and Medical Imaging Xianning Medical CollegeHubei University of Science and TechnologyXianning 437100China Laboratory of Optoelectronic Information and Intelligent Control Hubei University of Science and TechnologyXianning 437100China School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China

Realizing single light solitons that are stable in high dimensions is a long-standing goal in research of nonlinear optical ***,we address a scheme to generate stable two-dimensional solitons in a cold Rydberg atomic system with a parity-time(PT) symmetric moiré optical *** uncover the formation,properties,and their dynamics of fundamental and two-pole gap solitons as well as vortical *** PT symmetry,lattice strength,and the degrees of local and nonlocal nonlinearity are tunable and can be used to control *** stability regions of these solitons are evaluated in two numerical ways:linear-stability analysis and time evolutions with *** results provide an insightful understanding of solitons physics in combined versatile platforms of PT-symmetric systems and Rydberg–Rydberg interaction in cold gases.

关键词： Rydberg solitons symmetric

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Convolution Neural Network-based Load Model Parameter Selection Considering Short-term Voltage Stability

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CSEE Journal of Power and Energy systems 2024年第3期10卷 1064-1074页

作者： Ying Wang Chao Lu Xinran Zhang School of Technology Beijing Forestry UniversityBeijing 100083China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua UniversityBeijing 100084China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China IEEE

The recently proposed ambient signal-based load modeling approach offers an important and effective idea to study the time-varying and distributed characteristics of power ***,it also brings new *** the load model parameters of power loads can be obtained in real-time for each load bus,the numerous identified parameters make parameter application *** order to obtain the parameters suitable for off-line applications,load model parameter selection(LMPS)is first introduced in this ***,the convolution neural network(CNN)is adopted to achieve the selection purpose from the perspective of short-term voltage *** begin with,the field phasor measurement unit(PMU)data from China Southern Power Grid are obtained for load model parameter identification,and the identification results of different substations during different times indicate the necessity of ***,the simulation case of Guangdong Power Grid shows the process of LMPS,and the results from the CNNbased LMPS confirm its effectiveness.

关键词： Ambient signal CNN field PMU data load model parameter selection short-term voltage stability

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Machine Learning Security Analysis Framework Based on Threat Matrix 8

Machine Learning Security Analysis Framework Based on Threat...

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8th International Conference on Data science in Cyberspace, DSC 2023

作者： Li, Hu Ma, Qiongmin Zhang, Ming Kuang, Xiaohui National Key Laboratory of Science and Technology on Information System Security Beijing China National Key Laboratory for Complex Systems Simulation Beijing China

ISBN: (纸本)9798350331035

Machine Learning and Artificial Intelligence technology accelerates technological progress and promotes social development, but also brings many security problems. Machine learning models may be affected, deceived, controlled or destroyed at different stages, e.g. training and inference, which may lead to serious consequences. In view of the main stages of the life cycle of machine learning, we summarizes the related attack and defense technologies based on threat matrix, makes a comprehensive and systematic analysis on the security issues of machine learning, and puts forward several security protection suggestions for intelligent information systems. © 2023 IEEE.

关键词： Artificial Intelligence Machine Learning Security Analysis Threat Matrix

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Anomalous enhancing effects of electric pulse treatment on strength and ductility of TC17 linear friction welding joints

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Journal of Materials science & technology 2024年第36期203卷 155-166页

作者： Xin Zhang Junjie Zhang Yunkui Yao Qingsong Qiao Lixing Zhao Leichang Liu Feng Jin Mei Zhan Hongwei Li Key Laboratory of High-Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Mechanical properties of TC17 titanium alloy undergo a significant reduction after linear friction welding(LFW),of which the strength and ductility are hard to be improved simultaneously by traditional aging heat treatment(AHT),seriously limiting the application of LFW in the manufacturing of TC17 titanium alloy *** this end,the present work proposes to use electric pulse treatment(EPT)to enhance the strength and ductility of TC17 LFW joints simultaneously by improving its *** results show that,in comparison to the uneven distribution ofαphases in the welding zone(WZ),heat-affected zone(HAZ),and base metal(BM)zone after AHT,EPT can selectively homogenize theαphase distribution of WZ and HAZ without impacting the *** selective effect of EPT is reflected as the synergistic influence of the local Joule heating effect and the electron wind effect,which promotes the diffusion ofβphase stabilizing element Mo and leads to a competitive precipitation ofβphase andαphase in theαphase transition temperature *** ratio ofαphase toβphase in the WZ and HAZ finally approaches an equilibrium point which is similar to that of BM,leading to a uniform distribution ofαphase and realizing the synergy of strength-ductility of LFW joint:the maximum strength increase observed is 12.9%,accompanied by a corresponding elongation increase of 122%(by AHT&EPT),and the maximum plasticity improvement is 185%,accompanied by a corresponding strength increase of 4.3%(by EPT for 1 h).This study provides essential insights for improving the strength and ductility of LFW TC17 titanium alloy blisks and enhancing the applications of LFW in aeroengine components.

关键词： Linear friction welding TC17 titanium alloy Electric pulse treatment Phase transformation Local joule heating effect

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Recent advances in one-dimensional alkali-metal hexatitanate photocatalysts for environmental remediation and solar fuel production

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Journal of Materials science & technology 2024年第35期202卷 201-239页

作者： Qiang Wang Xiaofan Yang Zhao Jing Hong Liu Pengyi Tang Hongmin Zhu Bing Li National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China 2020 X-Lab Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Department of Metallurgy Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan

The global energy crisis and environmental problems have become two unprecedented ***-conductor photocatalysis offers a promising strategy to solve them,while its practical application requires advanced photocatalytic *** recent years,one-dimensional(1D)alkali-metal hexatitanate(AHT)photocatalysts have attracted considerable attention in energy and environmental fields due to their high chemical stability,excellent photoactivity,unique ion-exchange,environment-friendly,and cost-effective *** this review,we firstly introduce the basic properties of AHT including crystal and electronic band structure,photoactivity,and structure-property-performance ***,the recent ad-vances in synthesis and modification strategies of 1D AHT photocatalysts are summarized thoughtfully,followed by a comprehensive discussion on their various environmental and energy applications,includ-ing pollutant degradation,H2 generation,and CO_(2)***,the key challenges and prospects are also highlighted for the development of high-performance 1D AHT-based photocatalysts for practi-cal *** hope that this review will shed some light on the rational design of 1D Ti-O-based nanomaterials for efficient environmental remediation and solar fuel production.

关键词： Alkali-metal hexatitanates One-dimensional nanomaterials Photocatalysis Pollutant degradation Solar fuels

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Dual-Stage Erbium-Doped Fiber Amplifier with Improved Ultra High-Sensitivity Performance

Dual-Stage Erbium-Doped Fiber Amplifier with Improved Ultra ...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on information Photonics and Optical Communications, IPOC 2024

作者： Liu, Jiale Qiu, Tian Wang, Yizhou Li, Shijie Ye, Chengxuan Zhang, Shenmao Dai, Xiaoxiao Yang, Qi Liu, Deming National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Hubei Optical Fundamental Research Center Wuhan China Jinyinhu Laboratory Wuhan China

ISBN: (纸本)9798350379266

关键词： Erbium doped fiber amplifiers

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Demonstration of High-sensitivity Auxiliary Management and Control Channel Detection Based on Native 50G PON Modules

Demonstration of High-sensitivity Auxiliary Management and C...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on information Photonics and Optical Communications, IPOC 2024

作者： Xue, Henfeng Zou, Yang Liang, Zipeng Sun, Pengzhuo Luo, Zhen Chay, Chenghao Qiu, Tian Liu, Jiale Wang, Liang Dai, Xiaoxiao Zhang, Shenmao Liu, Deming Yang, Qi National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Jinyinhu Laboratory Wuhan China Hubei Optical Fundamental Research Center Wuhan China

A high-sensitivity AMCC detection scheme based on native 50G PON modules has been experimentally demonstrated. Results show that the sensitivity of AMCC signals can reach -46.5dBm with a power penalty of © 2024 I... 详细信息

ISBN: (纸本)9798350379266

关键词： Signal detection

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DPT‐tracker:Dual pooling transformer for efficient visual tracking

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CAAI Transactions on Intelligence technology 2024年第4期9卷 948-959页

作者： Yang Fang Bailian Xie Uswah Khairuddin Zijian Min Bingbing Jiang Weisheng Li Key Laboratory of Data Engineering and Visual Computing Chongqing University of Posts and TelecommunicationsChongqingChina Department of Mechanical Precision Engineering Malaysia‐Japan International Institute of TechnologyUniversity of Technology MalaysiaKuala LumpurMalaysia Department of Electrical and Computer Engineering Inha UniversityIncheonRepublic of Korea School of Information Science and Technology Hangzhou Normal UniversityHangzhouChina

Transformer tracking always takes paired template and search images as encoder input and conduct feature extraction and target‐search feature correlation by self and/or cross attention operations,thus the model complexity will grow quadratically with the number of input *** alleviate the burden of this tracking paradigm and facilitate practical deployment of Transformer‐based trackers,we propose a dual pooling transformer tracking framework,dubbed as DPT,which consists of three components:a simple yet efficient spatiotemporal attention model(SAM),a mutual correlation pooling Trans-former(MCPT)and a multiscale aggregation pooling Transformer(MAPT).SAM is designed to gracefully aggregates temporal dynamics and spatial appearance information of multi‐frame templates along space‐time *** aims to capture multi‐scale pooled and correlated contextual features,which is followed by MAPT that aggregates multi‐scale features into a unified feature representation for tracking *** tracker achieves AUC score of 69.5 on LaSOT and precision score of 82.8 on Track-ingNet while maintaining a shorter sequence length of attention tokens,fewer parameters and FLOPs compared to existing state‐of‐the‐art(SOTA)Transformer tracking *** experiments demonstrate that DPT tracker yields a strong real‐time tracking baseline with a good trade‐off between tracking performance and inference efficiency.

关键词： human‐computer interfacing image motion analysis pattern recognition signal processing tracking

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