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2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023

作者： Fang, Ying Mullurkara, Suraj Taddei, K.M. Wang, G. Ohodnicki, P. University of Pittsburgh Mechanical Engineering and Materials Science PA15216 United States Oak Ridge National Laboratory Oak RidgeTN37830 United States University of Pittsburgh Electrical and Computer Engineering PA15216 United States University of Pittsburgh Department of Physics & Astronomy PA15216 United States

ISBN: (纸本)9798350338362

Phase pure cobalt ferrite of spinel structure (CoFe2O4) is experimentally synthesized using bulk powder processing methods and characterized using neutron diffraction methods to quantitatively characterize cation site occupation, magnetic moment, and magnetic ordering as a function of temperature. Novel computational techniques based upon a combination of density functional theoretical calculation, machine learning, and Monte Carlo methods are applied to calculate the same quantities for direct comparison with experiments. The obtained results show excellent agreement, and the combination of experimental and theoretical methods enables the unambiguous extraction of exchange bond energies between A-A, B-B, and A-B sites in the spinel structure with excellent agreement to theoretical predictions, as compared to traditional empirical fitting methods using average magnetization as a function of temperature. The proposed methods offer an opportunity to further explore spinel ferrite systems for a deeper understanding of bonding and exchange interactions within these complex and interesting ferrimagnetic systems. © 2023 IEEE.

关键词： Density functional theory

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The Influence of Local Stoichiometry, Bonding, and Structure on Interface Vibrations

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 620-621页

作者： Hoglund, Eric R. Bao, De-Liang Hoque, Md Shafkat Bin Howe, James M. Pantelides, Sokrates T. Hopkins, Patrick E. Hachtel, Jordan A. Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN United States Dept. of Materials Science and Engineering University of Virginia Charlottesville VA United States Department of Physics andAstronomy Vanderbilt University Nashville TN United States Dept. of Mechanical Engineering University of Virginia Charlottesville VA United States Dept. of Electrical and Computer Engineering Vanderbilt University Nashville TN United States

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Surface-patterned chalcogenide glasses with high-aspect-ratio microstructures for long-wave infrared metalenses

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Opto-Electronic science 2024年第10期3卷 1-13页

作者： Zhaofeng Gu Yixiao Gao Kongsi Zhou Junyang Ge Chen Xu Lei Xu Mohsen Rahmani Ran Jiang Yimin Chen Zijun Liu Chenjie Gu Yaoguang Ma Jianrong Qiu Xiang Shen Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices Ningbo 315211China Advanced Optics&Photonics Laboratory Department of EngineeringSchool of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUnited Kingdom Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingbo 315211China State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational ResearchCenter for Advanced PhotonicsZhejiang UniversityHangzhou 310027China Ningbo Institute of Oceanography Ningbo 315832China

Multidimensional-engineering chalcogenide glasses is widely explored to construct various infrared photonic devices,with their surface as a key dimension for wavefront ***,we demonstrate direct patterning high-aspect-ratio microstructures on the surface of chalcogenide glasses offers an efficient and robust method to manipulate longwave infrared *** chalcogenide glass being considered soft in terms of its mechanical properties,we successfully fabricate high-aspect-ratio micropillars with a height of 8μm using optimized deep etching process,and we demonstrate a 2-mm-diameter all-chalcogenide metalens with a numerical aperture of 0.45 on the surface of a 1.5-mm-thick As2Se3 *** the exceptional longwave infrared(LWIR)transparency and moderate refractive index of As2Se3 glass,the all-chalcogenide metalens produces a focal spot size of~1.39λ0 with a focusing efficiency of 47%at the wavelength of 9.78μm,while also exhibiting high-resolution imaging *** work provides a promising route to realize easy-to-fabricate,mass-producible planar infrared optics for compact,light-weight LWIR imaging systems.

关键词： chalcogenide glasses long wave infrared metalens

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Path Signatures and Graph Neural Networks for Slow Earthquake Analysis: Better Together?

arXiv

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arXiv 2024年

作者： Riess, Hans Veveakis, Manolis Zavlanos, Michael M. Department of Electrical & Computer Engineering Duke University DurhamNC United States Department of Civil & Environmental Engineering Duke University DurhamNC United States Department of Mechanical Engineering & Materials Science DurhamNC United States

The path signature, having enjoyed recent success in the machine learning community, is a theoretically-driven method for engineering features from irregular paths. On the other hand, graph neural networks (GNN), neural architectures for processing data on graphs, excel on tasks with irregular domains, such as sensor networks. In this paper, we introduce a novel approach, Path Signature Graph Convolutional Neural Networks (PS-GCNN), integrating path signatures into graph convolutional neural networks (GCNN), and leveraging the strengths of both path signatures, for feature extraction, and GCNNs, for handling spatial interactions. We apply our method to analyze slow earthquake sequences, also called slow slip events (SSE), utilizing data from GPS timeseries, with a case study on a GPS sensor network on the east coast of New Zealand’s north island. We also establish benchmarks for our method on simulated stochastic differential equations, which model similar reaction-diffusion phenomenon. Our methodology shows promise for future advancement in earthquake prediction and sensor network analysis. Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

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Camera-based Motion Correction for PET/MR Brain Imaging

Camera-based Motion Correction for PET/MR Brain Imaging

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2022 IEEE Nuclear science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference, IEEE NSS MIC RTSD 2022

作者： Fisher, Jonathan Groll, Andrew Kim, Chris C. Innes, Derek Levin, Craig S. Stanford University Department of Electrical Engineering CA United States Molecular Imaging Program Stanford University Department of Radiology CA United States Stanford University Department of Computer Science CA United States Stanford University Physics Electrical Engineering and Bioengineering Department of Radiology CA United States

ISBN: (纸本)9781665488723

In this work, we evaluated the performance of a camera-based rigid body motion correction solution in PET studies. We compared the image quality obtained by reconstructing a static phantom scan to those obtained by reconstructing a moving phantom scan with and without applying motion correction. Our suggested solution uses a camera to track a 3D marker attached to the object to be imaged (in this work, a resolution phantom). This data was incorporated in the multiple acquisition frames (MAF) image reconstruction algorithm to compensate for motion. While we got multiple spatially shifted replicas of the resolution phantom in the motion study's reconstructed image when motion correction was not applied, the motion-corrected image was comparable to the static image, with some degradation in spatial resolution (3.2-4.2 vs. 2.8-3.2 mm) and lower peak to valley ratio (indicating lower contrast to noise ratio). The context of the results presented is in PET/MR imaging, but in principle, this motion compensation method could be used in any type of medical imaging modality. © 2022 IEEE.

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Ultra-flexible semitransparent organic photovoltaics

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npj Flexible Electronics 2023年第1期7卷 274-282页

作者： Hanbee Lee Soyeong Jeong Jae-Hyun Kim Yong-Ryun Jo Hyeong Ju Eun Byoungwook Park Sung Cheol Yoon Jong H.Kim Seung-Hoon Lee Sungjun Park Department of Electrical and Computer Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Chemistry and Centre for Processable Electronics Imperial College LondonWhite City W120BZUK Department of Intelligence Semiconductor Engineering Ajou UniversitySuwon 16499Republic of Korea Advanced Photonics Research Institute(APRI) Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Division of Molecular Science and Technology Ajou UniversitySuwon 16499Republic of Korea Division of Advanced Materials Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea Division of Advanced materials Engineering Kongju National University1223-24 Cheonan-daeroSeobuk-guCheonan-siChungcheongnam-doRepublic of Korea

Ultra-flexible organic photovoltaics(OPVs)are promising candidates for next-generation power sources owing to their low weight,transparency,and ***,obtaining ultra-flexibility under extreme repetitive mechanical stress while maintaining optical transparency remains challenging because of the intrinsic brittleness of transparent ***,we introduce straindurable ultra-flexible semitransparent OPVs with a thickness below 2μ*** conformal surface coverage of nanoscale thin metal electrodes(<10 nm)is achieved,resulting in extremely low flexural rigidity and high strain ***-depth optical and electrical analyses on ultrathin metal electrodes showed that the devices maintain over 73%of their initial efficiency after 1000 cycles of repetitive compression and release at 66%compressive strain,and the average visible light transmittances remain higher than 30%.To our knowledge,this is the first systematical study on mechanical behaviors of strain-durable ultra-flexible ST-OPVs through precise adjustment of each ultrathin electrode thickness toward the emergence of next-generation flexible power sources.

关键词： transparency durability rigidity

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A Real-Time Detection Method of Non-Metallic Threats from Restored Image using Blended Image Network 3

A Real-Time Detection Method of Non-Metallic Threats from Re...

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3rd International Conference on Smart Electronics and Communication, ICOSEC 2022

作者： Sukumar, Binu Balaji, A. Lakshmi, D. Karthikeyan, G. Sobitha, S. Mohanavel, V. R.M.K. Engineering College Department of Civil Engineering Chennai India Rajalakshmi Instittue of Technology Department of Electronics and Communication Engineering Chennai India Panimalar Engineering College Department of Computer Science and Engineering Chennai India Sona College of Technology Department of Electrical and Electronics Engineering Salem India Saveetha School of Engineering Simats Department of Computer Science and Engineering Chennai India Centre for Materials Engineering and Regenerative Medicine Bharath Institute of Higher Education and Research Tamil Nadu Chennai600073 India Chandigarh University Department of Mechanical Engineering Punjab Mohali140413 India

ISBN: (数字)9781665497640

ISBN: (纸本)9781665497640

Due to its excellent garment penetration and safety, passive millimeter waves have been used in surveillance assessment. Nevertheless, limited resolution as well as inherent noise is problems with passive millimeter wave imaging (PMWs). The approaches that have been des cribed seldom improve the appearance of pictures for PMW and solely conduct detection system based on selecting relevant PMW that results in a high percentage of false alarms. Furthermore, the changes in grayscale make it challenging to distinguish low-reflective non-metallic dangers. An approach to finding hidden hazards in the human body is suggested in this research. To rebuild high-quality images using multi-source PMWs, this research study proposes a GAN framework. A unique image recognition pipeline is designed by incorporating feature extraction, image normalization, and a thorough analyzer models. The registering system is suggested for analyzing the peronal data as well as the reduction of false alarms, while the categorization network uses multi-scale characteristics to combine the local and global data in both PMWs as well as visible images to gain accurate shape and performance indicators. Allows the prediction for metallic and non-metallic objects may be done using the grayscale and contour characteristics, accordingly. The recognition findings of each individual frame are then combined using a synthetic method. The efficiency of each module and that of the suggested approach is assessed by using the experimental measurements. With 92.35% accuracy and 90.3% recall, experimental findings show that the proposed technique functions better than the other existing techniques. It also has a high detection rate. © 2022 IEEE.

关键词： Image compression

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Long-range propagation of exciton polaritons in 2D semiconductor monolayers at room temperature

Long-range propagation of exciton polaritons in 2D semicondu...

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Frontiers in Optics, FiO 2022

作者： Liu, Bin Zhao, Haonan Forrest, Stephen R. Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States

In the light-matter strong coupling regime, we observe long-range exciton-polariton propagation in monolayer transition metal dichalcogenides at room temperature, where the propagation distance depends on the Bloch su...

ISBN: (纸本)9781557528209

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Modified Isolated SEPIC Converter for EV Charging and High Voltage Applications

Modified Isolated SEPIC Converter for EV Charging and High V...

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Power, Instrumentation, Energy and Control (PIECON), International Conference on

作者： Javed Ahmad Chang-Hua Lin Mohammad Suhail Khan Hwa-Dong Liu Mohammad Fahad Department of Electrical Engineering College of Electrical Engineering and Computer Science National Taiwan University of Science and Technology Taipei Taiwan Undergraduate Program of Vehicle and Energy Engineering National Taiwan Normal University Taipei Taiwan

This research article presents a modified isolated SEPIC converter suitable for high-power applications. It uses a transformer instead of coupled inductor for isolation between the input power source and the output load. The steady-state analysis is explained in detail. Thermal loss analysis is performed by using PLECS software. Further, a hardware prototype is developed to verify the performance aspects of the proposed converter.

关键词： Instruments Prototypes High-voltage techniques Transformers Software Hardware Electric vehicle charging

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Passive Cancellation Method for Common-Mode Noise Based on a Nonlinear Model

Passive Cancellation Method for Common-Mode Noise Based on a...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Yeu-Torng Yau Thanh-Phu Luu Department of Ph.D. Program Prospective Technology of Electrical Engineering and Computer Science National Chin-Yi University of Technology Taichung Taiwan Department of Electrical Engineering National Chin-Yi University of Technology Taichung Taiwan

ISBN: (数字)9784885523472

ISBN: (纸本)9798350349498

AC-DC converters almost always require common-mode (CM) filters to restrict conducting their electromagnetic interference (EMI) emissions to the power grid and ensure compliance with EMI certification requirements. These CM filters, which are based on the well-known LC lowpass filter, are typically bulky and expensive. Hence, a method for passive $\mathbf{C M}$ current cancellation using a nonlinear model is proposed herein. This method is entirely composed of passive components and offers advantages in terms of cost and system reliability. Compared to conventional passive LC filters, the number of magnetic components remains unchanged. This study proposes the derivation of a nonlinear model to estimate the filter performance using measured data from an actual CM choke; however, the proposed method does not require the mathematical model of a CM choke.

关键词： Magnetic separation Electromagnetic interference Low-pass filters Electromagnetic compatibility Noise cancellation Mathematical models Power grids

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