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14th IEEE International Conference on RFID Technology and Applications, RFID-TA 2024

作者： Chen, Tianyang Liu, Yulong Li, Zhengzheng Jiang, Yuchen Yu, Mengxia Xu, Lulu Ye, Terry Tao Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen China Institute of Nanoscience and Applications Southern University of Science and Technology Shenzhen China Jiaxing Research Institute Southern University of Science and Technology Jiaxing China Department of Applied Physics Hong Kong Polytechnic University Hong Kong Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore School of Mechanical Electrical and Manufacturing Engineering Loughborough University Loughborough United Kingdom

ISBN: (纸本)9798331540227

We propose a novel design for RFID tags - ID-Yarn, in which an RFID tag is integrated into a yarn suitable for weaving, embroidery, or seam attachment to fabric. ID-Yarn comprises an RFID transponder chip soldered with a conductive filament onto the chip pads. The chip and the filament are then enveloped with non-conductive fibers, creating a yarn structure. The conductive filament within the ID-Yarn serves as a dipole antenna, and various dipole antenna configurations can be achieved by shaping the ID-Yarn into different geometries. We have introduced three dipole variations: a dipole with varied arms for conjugate-matching the chip impedance, a dipole with meander-lined arms, and a dipole with looped arms. Simulations and prototypes of these variations demonstrate the feasibility of ID-Yarns. Notably, the ID-Yarn shaped into a looped dipole geometry exhibits the best performance. © 2024 IEEE.

关键词： Linen

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A Portable 3D-Printed Dielectric Lens Antennas for Liquid-Mixture Characterization

A Portable 3D-Printed Dielectric Lens Antennas for Liquid-Mi...

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International Symposium on Antennas and Propagation (ISAP)

作者： Patchadaporn Sangpet Prayoot Akkaraekthalin Wanwisa Thaiwirot Nutapong Somjit Sukanya Chudpooti Nonchanutt Chudpooti Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand School of Electronic and Electrical Engineering University of Leeds Leeds United Kingdom Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand

The Fused Deposition Modeling (FDM) method is utilized in this research to present dielectric lens antennas that were 3D printed. The ultra-wideband (UWB) stub antenna’s antenna characteristic is intended to be improved by the 3D-printed dielectric lens antennas. The proportion of ethanol in the liquid mixture sample is categorized using the transmission-line measuring technique. The device-under-test (DUT) is placed between two 3D-printed dielectric lens antennas. The glass bottle is filled with a 100-ml liquid sample and covered with a plastic cap. The 3D EM Simulation CST Studio is used to optimize the 10 mm gap between the dielectric lens antennas and the DUT. Six concentrations of the ethanol/water mixture, such as empty, 60%, 65%, 70%, and 80%, are measured to examine the measurement system. The measurement outcomes indicate the various S21 (transmission coefficient) levels between 9 GHz and 11 GHz. According to the trend of the suggested system, the level of the transmission coefficient, S21, will change downward when the proportion of ethanol is increased. Several better advantages, such as a non-destructive method, non-contact measurement, and support with a real-time monitoring system, are provided by the transmission-line measuring methodology using 3D-printed dielectric lens antennas.

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ID-Yarn: Form-factoring an RFID Tag into a Yarn and How It Can Work Well

ID-Yarn: Form-factoring an RFID Tag into a Yarn and How It C...

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IEEE International Conference on RFID-Technology and Applications (RFID-TA)

作者： Tianyang Chen Yulong Liu Zhengzheng Li Yuchen Jiang Mengxia Yu Lulu Xu Terry Tao Ye Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen China Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China Jiaxing Research Institute Southern University of Science and Technology Jiaxing China Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore School of Mechanical Electrical and Manufacturing Engineering Loughborough University Loughborough UK Institute of Nanoscience and Applications Southern University of Science and Technology Shenzhen China

ISBN: (数字)9798331540227

ISBN: (纸本)9798331540234

关键词： Geometry Optical fiber sensors Dipole antennas Weaving Fabrics Sensors Transponders Textile antennas Yarn RFID tags

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A Case for Optics-Based Microbial Risk Assessment of Potable Water

A Case for Optics-Based Microbial Risk Assessment of Potable...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Rijan Maharjan Anusa Thapa Prajwal Rajbhandari Daniele Faccio Emiliano R. Martins Thomas F Krauss Ashim Dhakal Biophotonics Lab Phutung Research Institute Kathmandu Nepal Department of Applied Microbiology and Food Technology Research Institute for Bioscience and Biotechnology Kathmandu Nepal School of Physics & Astronomy University of Glasgow Glasgow UK Department of Electrical and Computer Engineering University of São Paulo São Paulo Brazil Department of Physics University of York York UK

Reagentless optics-based techniques, such as fluorimetry, outperform all current methods in all key requirement categories for microbial risk assessment of potable water in resource-limited settings, provided that the... 详细信息

ISBN: (纸本)9798350369311

关键词： Lasers and electrooptics Bacteria Risk management Water resources Electro-optical waveguides

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Modeling functional cell types in spike train data

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PLoS Computational Biology 2023年第10 October期19卷 e1011509-e1011509页

作者： Zdeblick, Daniel N. Shea-Brown, Eric T. Witten, Daniela M. Buice, Michael A. Department of Electrical and Computer Engineering University of Washington SeattleWA United States Department of Applied Math University of Washington SeattleWA United States MindScope Program Allen Institute SeattleWA United States Department of Statistics and Biostatistics University of Washington SeattleWA United States

A major goal of computational neuroscience is to build accurate models of the activity of neurons that can be used to interpret their function in circuits. Here, we explore using functional cell types to refine single-cell models by grouping them into functionally relevant classes. Formally, we define a hierarchical generative model for cell types, single-cell parameters, and neural responses, and then derive an expectation-maximization algorithm with variational inference that maximizes the likelihood of the neural recordings. We apply this "simultaneous" method to estimate cell types and fit single-cell models from simulated data, and find that it accurately recovers the ground truth parameters. We then apply our approach to in vitro neural recordings from neurons in mouse primary visual cortex, and find that it yields improved prediction of single-cell activity. We demonstrate that the discovered cell-type clusters are well separated and generalizable, and thus amenable to interpretation. We then compare discovered cluster memberships with locational, morphological, and transcriptomic data. Our findings reveal the potential to improve models of neural responses by explicitly allowing for shared functional properties across neurons. Copyright: © 2023 Zdeblick et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

关键词： Neurons

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Non-Destructive Ethanol-Aqueous Solution with Modified Jerusalem Resonator for Disinfectants Against COVID-19 Characterization

Non-Destructive Ethanol-Aqueous Solution with Modified Jerus...

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International Symposium on Antennas and Propagation (ISAP)

作者： Patchadaporn Sangpet Prayoot Akkaraekthalin Tanaporn Pechrkool Sukanya Chudpooti Nonchanutt Chudpooti Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand

This paper describes a liquid-mixture sensor based on a mushroom-shaped zeroth-order resonator (ZOR). The Jerusalem-shaped mushroom-like structure is designed to reduce the dimensions of a resonator and provide a high Q-factor with an operating frequency of 5.90 GHz. Using perturbation theory, every dielectric property of the liquid-mixture influences the resonance frequency. The structure of the sensor is composed of the modified Jerusalem resonator and 3D-printed case for locking the liquid under test (LUT) to reduce the problematic error from position measurement. Five Ethanol-aqueous concentrations, e.g., 60%, 65%, 70%, 75% and 80%, are chosen to investigate the responsibility of the modified Jerusalem resonator. By detecting the change in resonant frequency of the reflection coefficient, S11, the measured results can classify five conditions of the LUT. Other benefits of the zeroth-order resonator sensor include a nondestructive method, real-time monitoring, and no life-cycle limitation.

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electrically injected GeSn lasers with peak wavelength up to 2.7 μm

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Photonics Research 2022年第1期10卷 222-229页

作者： YIYIN ZHOU SOLOMON OJO CHEN-WEI WU YUANHAO MIAO HUONG TRAN JOSHUA MGRANT GREY ABERNATHY SYLVESTER AMOAH JAKE BASS GREGORY SALAMO WEI DU GUO-EN CHANG JIFENG LIU JOE MARGETIS JOHN TOLLE YONG-HANG ZHANG GREG SUN RICHARD ASOREF BAOHUA LI SHUI-QING YU Department of Electrical Engineering University of ArkansasFayettevilleArkansas 72701USA Microelectronics-Photonics Program University of ArkansasFayettevilleArkansas 72701USA Department of Mechanical Engineering Taiwan Chung-Cheng UniversityMing-HsiungChiayi 62102China Department of Physics University of ArkansasFayettevilleArkansas 72701USA Institute for Nanoscience and Engineering University of ArkansasFayettevilleArkansas 72701USA Department of Electrical Engineering and Physics Wilkes UniversityWilkes-BarrePennsylvania 18766USA Thayer School of Engineering Dartmouth CollegeHanoverNew Hampshire 03755USA School of Electrical Energy and Computer EngineeringArizona State UniversityTempeArizona 85287USA Department of Electrical Engineering University of Massachusetts BostonBostonMassachusetts 02125USA Arktonics LLCFayettevilleArkansas 72701USA

GeSn lasers enable the monolithic integration of lasers on the Si platform using all-group-Ⅳ direct-bandgap *** GeSn laser study recently moved from optical pumping into electrical *** this work,we present explorative investigations of GeSn heterostructure laser diodes with various layer thicknesses and material *** layer material was studied by using Si_(0.03)Ge_(0.89)Sn_(0.08) and Ge_(0.95)Sn_(0.05),and cap layer total thickness was also *** 190 nm SiGeSn-cap device had threshold of 0.6 kA/cm^(2) at 10 K and a maximum operating temperature(T_(max)) of 100 K,compared to 1.4 kA/cm^(2) and 50 K from 150 nm SiGeSn-cap device,***,the 220 nm GeSn-cap device had 10 K threshold at 2.4 kA/cm^(2) and T_(max) at 90 K,i.e.,higher threshold and lower maximal operation temperature compared to the SiGeSn cap layer,indicating that enhanced electron confinement using SiGeSn can reduce the threshold *** study of the active region material showed that device gain region using Ge_(0.87)Sn_(0.13) had a higher threshold and lower T_(max),compared to Ge_(0.89)Sn_(0.11).The performance was affected by the metal absorption,free carrier absorption,and possibly defect density *** maximum peak wavelength was measured as 2682 nm at 90 K by using Ge_(0.87)Sn_(0.13) in gain *** investigations provide directions to the future GeSn laser diode designs toward the full integration of group-Ⅳ photonics on a Si platform.

关键词： GeSn pumping absorption

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Unsupervised Video Domain Adaptation with Masked Pre-Training and Collaborative Self-Training

arXiv

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arXiv 2023年

作者： Reddy, Arun Paul, William Rivera, Corban Shah, Ketul de Melo, Celso M. Chellappa, Rama Johns Hopkins University Applied Physics Laboratory United States Johns Hopkins University Department of Electrical & Computer Engineering United States DEVCOM U.S. Army Research Laboratory United States

In this work, we tackle the problem of unsupervised domain adaptation (UDA) for video action recognition. Our approach, which we call UNITE, uses an image teacher model to adapt a video student model to the target domain. UNITE first employs self-supervised pre-training to promote discriminative feature learning on target domain videos using a teacher-guided masked distillation objective. We then perform self-training on masked target data, using the video student model and image teacher model together to generate improved pseudolabels for unlabeled target videos. Our self-training process successfully leverages the strengths of both models to achieve strong transfer performance across domains. We evaluate our approach on multiple video domain adaptation benchmarks and observe significant improvements upon previously reported results. Code is available at https://***/reddyav1/unite. Copyright © 2023, The Authors. All rights reserved.

关键词： Distillation

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Wigner non-negative states that verify the Wigner entropy conjecture

arXiv

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arXiv 2024年

作者： Qian, Qipeng Gagatsos, Christos N. Program in Applied Mathematics The University of Arizona TucsonAZ85721 United States Department of Electrical and Computer Engineering The University of Arizona TucsonAZ85721 United States Wyant College of Optical Sciences The University of Arizona TucsonAZ85721 United States

We present further progress, in the form of analytical results, on the Wigner entropy conjecture set forth in [Phys. Rev. A 104, 042211 (2021)] and [J. Phys. A: Math. Theor. 50 385301]. Said conjecture asserts that the differential entropy defined for non-negative, yet physical, Wigner functions is minimized by pure Gaussian states while the minimum entropy is equal to 1 + ln π. We prove this conjecture for the qubits formed by Fock states |0) and |1) that correspond to non-negative Wigner functions. In particular, we derive an explicit form of the Wigner entropy for those states lying on the boundary of the set of Wigner non-negative qubits. We then consider general mixed states and derive a sufficient condition for the conjecture’s validity. Lastly, we elaborate on the states which are in accordance with our condition. Copyright © 2024, The Authors. All rights reserved.

关键词： Entropy

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Large Spin-Orbit-Torque Efficiency and Room-Temperature Magnetization Switching in SrIrO3/Co-Fe-B Heterostructures

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Physical Review applied 2023年第2期19卷 024076-024076页

作者： Peng Li Sanyum Channa Xiang Li Laith Alahmed Chunli Tang Di Yi Lauren Riddiford Jacob Wisser Purnima P. Balakrishnan Xin Yu Zheng Di Lu Arturas Vailionis Shan X. Wang Yuri Suzuki Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA Department of Physics Stanford University Stanford California 94305 USA Department of Electrical Engineering Stanford University Stanford California 94305 USA Department of Electrical and Computer Engineering Auburn University Auburn AL 36849 USA Department of Applied Physics Stanford University Stanford California 94305 USA School of Microelectronics University of Science and Technology of China Hefei 230052 China Stanford Nano Shared Facilities Stanford University Stanford California 94305 USA Department of Physics Kaunas University of Technology Kaunas Lithuania

Spin-orbit-torque (SOT) switching is a potentially energy-efficient mechanism by which electrical current can control magnetization. We demonstrate room-temperature SOT switching in nanometer-thick CoFeB/SrIrO3 bilayers despite the amorphous nature of CoFeB and the interface. This behavior is attributed to the large spin Hall angle in SrIrO3 as well as high spin transmission at the interface that contribute to the SOT efficiency ξSOT. Our bilayers exhibit large ξSOT of up to 1.4 and effective spin Hall conductivity of 0.9×105 (ℏ/2e)Ω−1m−1. In our bilayers, we observe unidirectional magnetoresistance and current-induced magnetization switching with a low critical current density of 1.38×1010A/m2 at room temperature. Our results are promising for heterostructures combining technologically relevant CoFeB with high spin-orbit-coupling oxides.

关键词： Magnetization switching Magnetoresistance Spin current Spin-orbit torque Devices for digital logic, storage & processing Ferromagnets Magnetic multilayers Transition metal oxides

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