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Compression of Battery X-Ray Tomography Data with Machine Learning

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Chinese Physics Letters 2024年第9期41卷 153-158页

作者： Zipei Yan Qiyu Wang xiqian Yu Jizhou Li Michael K.-P.Ng Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CUHK Shenzhen Research Institute Shenzhen 518057China Department of Mathematics Hong Kong Baptist UniversityHong KongChina

With the increasing demand for high-resolution x-ray tomography in battery characterization,the challenges of storing,transmitting,and analyzing substantial imaging data necessitate more efficient *** data compression methods struggle to balance reduction ratio and image quality,often failing to preserve critical details for accurate *** study proposes a machine learning-assisted compression method tailored for battery x-ray imaging *** physics-informed representation learning,our approach significantly reduces file sizes without sacrificing meaningful *** validate the method on typical battery materials and different x-ray imaging techniques,demonstrating its effectiveness in preserving structural and chemical *** results show an up-to-95 compression ratio while maintaining high fidelity in the projection and reconstructed *** proposed framework provides a promising solution for managing large-scale battery x-ray imaging datasets,facilitating significant advancements in battery research and development.

关键词： battery Battery details

Neutron-based characterization techniques for lithium-ion battery research

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Chinese Physics B 2020年第1期29卷 40-61页

作者： Enyue Zhao Zhi-Gang Zhang Xiyang Li Lunhua He xiqian Yu Hong Li Fangwei Wang Songshan Lake Materials Laboratory Dongguan 523808China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 101408China China Spallation Neutron Source(CSNS) Dongguan 523808China

During the past decades,Li-ion batteries have been one of the most important energy storage ***-scale energy storage requires Li-ion batteries which possess high energy density,low cost,and high *** than advanced battery materials,in-depth understanding of the intrinsic mechanism correlated with cell reaction is also essential for the development of high-performance Li-ion *** characterization techniques,especially neutron-based techniques,have greatly promoted Li-ion battery *** this review,the characteristics or capabilities of various neutron-based characterization techniques,including elastic neutron scattering,quasi-elastic neutron scattering,neutron imaging,and inelastic neutron scattering,for the related Li-ion-battery researches are *** design of in-situ/operando environment is also *** comprehensive survey on neutron-based characterizations for mechanism understanding will provide guidance for the further study of high-performance Li-ion batteries.

关键词： Li-ion battery neutron scattering characterization technique

Circulation background of climate patterns in the past millennium: Uncertainty analysis and re-reconstruction of ENSO-like state

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Science China Earth Sciences 2016年第6期59卷 1225-1241页

作者： tan Ming Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences

The question of whether or not global warming has paused since more than ten years ago, namely ＂warming hia- tus＂, has attracted the attention of climate science community including the IPCC. Some authors have attributed the ＂warming hiatus＂ to the internal changes in the climate system, i.e., the recombination of ocean-atmosphere circulations. Therefore, it is necessary to propose higher requirements on reconstructing circulation background of climate change for the past millennium. However, the analyses of changes in atmospheric circulation over the last millennium as well as the conclusions of related re- gional climate patterns are so widely different and contradictory, bringing uncertainties to our understanding of regional even global climate change to a great extent. On the other hand, in the last 10 years the high-precision U/Th-dated stalagmite oxygen isotope ratio （δ^18O） sequences provided an accurate chronological frame for the paleoclimate study of the middle and late Pleistocene, in which all authors from China took the Chinese stalagmite δ^18O as the summer monsoon index without excep- tion. However, this point of view misleads the climate scientists into thinking that the stalagmite δ^18O can be as the proxy of precipitation amount. Nevertheless, it is well known that all of these records have a lot in common in the low frequency trend. However, most sequences cannot be calibrated by instrumental precipitation records, and thus the uncertainty of the climate research framework of China and even of the world has increased. Therefore, it is imperative for climatology to clarify the origin of contradiction and to reduce the uncertainty as early as possible. On the basis of analyzing the significance of stalag- mite ~180 in the monsoon regions of China, the author tries to propose a new circulation proxy in this paper： integrating the Chinese stalagmite oxygen isotope sequence to reconstruct the tropical Pacific sea surface temperature gradient, i.e., th

关键词： The past millennium ENSO Circulation background Climate pattern WPSH Stalagmite δ^18O Circulation recombination

A NEW THRESHOLD AUTHENTICATED ENCRYPTION SCHEME USING LABOR-DIVISION SIGNATURE

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Journal of Systems Science & Complexity 2010年第6期23卷 1183-1194页

作者： Zuowen tan School of Information Technology Jiangxi University of Finance and Economics Nanchang 330032 China Key Lab of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 China.

This paper shows several security weaknesses of a threshold authenticated encryption scheme. A new threshold authenticated encryption scheme using labor-division signature is proposed without redundancy added to message blocks. On the assumptions of EDDH problems, the proposed scheme is secure against chosen-ciphertext attacks and existentially unforgeable against the chosen- message attacks in the random oracle model.

关键词： Authenticated encryption scheme public key cryptography threshold signature.

Finite element simulations of deformation behavior in equal channel angular pressing using a rotated die

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Acta Metallurgica Sinica(English Letters) 2012年第5期25卷 357-364页

作者： Yixuan tan School of Material Science and Engineering Central South University Changsha 410083 China Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute TroyNY 12180 USA Key Laboratory of Nonferrous Metal Materials Science and Engineering of the Ministry of Education Central South University Changsha 410012 China

A new die design for equal channel angular pressing （ECAP） of square cross-section billet was proposed by a 45° rotation of the inlet and outlet channels around the channel axes. ECAP utilizing the rotated and conventional dies was simulated in three dimensions using the finite element method. Conditions with different material properties and friction coefficients were studied. The billet deformation behavior was evaluated in terms of the spatial distribution of equivalent plastic strain, plastic deformation zone and load history. The results show that the rotated die appears to produce billets with a smaller deformation inhomogeneity over the entire cross- section and a greater average of equivalent plastic strain at the cost of a slightly larger working load. The billet deformdtion enters into a Steady s^ate earlier in the case of the rotated die than the conventional die under the condition of a relatively large friction coefficient.

关键词： Equal channel angular pressing Finite element method Defor-mation behavior

Communications in Theoretical Physics

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Communications in Theoretical Physics 2020年第5期72卷 1-12页

作者： Zhi-Zhong tan Zhen tan Department of Physics Nantong UniversityNantong226019China School of Information Science and Technology Nantong UniversityNantong 226019China

The unified processing and research of multiple network models are implemented,and a new theoretical advance has been made,which sets up two new theorems on evaluating the exact electrical characteristics(potential and resistance)of the complex m×n resistor networks by the recursion-transform method with potential parameters,and applies to a variety of different types of lattice structure with arbitrary boundaries such as the nonregular m×n rectangular networks and the nonregular m×n cylindrical *** research gives the analytical solutions of electrical characteristics of the complex networks(finite,semi-infinite and infinite),which has not been solved *** applications of the theorems,a series of analytical solutions of potential and resistance of the complex resistor networks are discovered.

关键词： complex network RT-V method electrical properties boundary conditions Laplace equation mathematical physics

Tailoring Defects in Hard Carbon Anode towards Enhanced Na Storage Performance

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Energy Material Advances 2022年第1期2022卷 262-272页

作者： Ruiqi Dong Feng Wu Ying Bai Qinghao Li xiqian Yu Yu Li Qiao Ni Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academic of ScienceBeijing 100190China

Hard carbon(HC)anodes show conspicuously commercialized potential for sodium-ion batteries(SIBs)due to their costeffectiveness and satisfactory ***,the development of hard carbon anodes in SIBs is still hindered by low initial Coulombic efficiency(ICE)and insufficient cyclic stability,which are induced by inappropriate defects in the ***,we introduce a simple but effective method to tailor the defects in HC by the chemically preadsorbed K^(+).The soft Xray absorption spectroscopy at the C K-edges reveals that K^(+)can anchor on the hard carbon via C-O-K bonds,occupying the irreversible reactive sites of Na^(+).Therefore,the irreversible capacity caused by some C-O bonds can be ***,the preadsorbed K^(+)can induce the rearrangement of carbon layers and lead to a high graphitization structure with fewer defects and large interlayer spacing,which not only improves the structural stability and electrical conductivity of the HC anode but also facilitates fast Na^(+)***,the as-obtained optimized anode demonstrates a higher ICE with better cyclic stability and superior rate capacities compared with the anode without preadsorbed K^(+).This work indicates that K^(+)preadsorbed into hard carbon is a practicable alternative to enhance the Na storage performances of HC anodes for SIBs.

关键词： irreversible stability anode

Electrical properties of m×n cylindrical network

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Chinese Physics B 2020年第8期29卷 182-197页

作者： Zhi-Zhong tan Zhen tan Department of Physics Nantong UniversityNantong 226019China School of Information Science and Technology Nantong UniversityNantong 226019China

We consider the problem of electrical properties of an m×n cylindrical network with two arbitrary boundaries,which contains multiple topological network models such as the regular cylindrical network,cobweb network,globe network,and so *** deduce three new and concise analytical formulae of potential and equivalent resistance for the complex network of cylinders by using the RT-V method(a recursion-transform method based on node potentials).To illustrate the multiplicity of the results we give a series of special ***,the results obtained from the resistance formulas of cobweb network and globe network obtained are different from the results of previous studies,which indicates that our research work creates new research ideas and *** a byproduct of the study,a new mathematical identity is discovered in the comparative study.

关键词： cylindrical network complex boundaries RT-V method electrical properties Laplace equation

高性能YOLOv3-tiny嵌入式硬件加速器的混合优化设计

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半导体技术 2025年第1期50卷 55-63页

作者：谭会生肖鑫凯卿翔湖南工业大学轨道交通学院湖南株洲412000

为解决在嵌入式设备中部署神经网络受算法复杂度、执行速度和硬件资源约束的问题,基于Zynq异构平台,设计了一个高性能的YOLOv3-tiny网络硬件加速器。在算法优化方面,将卷积层和批归一化层融合,使用8 bit量化算法,简化了算法流程;在加速... 详细信息

为解决在嵌入式设备中部署神经网络受算法复杂度、执行速度和硬件资源约束的问题,基于Zynq异构平台,设计了一个高性能的YOLOv3-tiny网络硬件加速器。在算法优化方面,将卷积层和批归一化层融合,使用8 bit量化算法,简化了算法流程;在加速器架构设计方面,设计了可动态配置的层间流水线和高效的数据传输方案,缩短了推理时间,减小了存储资源消耗;在网络前向推理方面,针对卷积计算,基于循环展开策略,设计了8通道并行流水的卷积模块;针对池化计算,采用分步计算策略实现对连续数据流的高效处理;针对上采样计算,提出了基于数据复制的2倍上采样方法。实验结果表明,前向推理时间为232 ms,功耗仅为2.29 W,系统工作频率为200 MHz,达到了23.97 GOPS的实际算力。

关键词： YOLOv3-tiny网络异构平台硬件加速器动态配置架构硬件混合优化数据复制上采样