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Antennas and Propagation Society International Symposium

作者： Ladislau Matekovits Ildiko Peter Symon K. Podilchak Alois P. Freundorfer Karu Esselle Yahia M. M. Antar Department of Electronics Politecnico di Torino Torino Italy Electronic Engineering Macquarie University Sydney NSW Australia Department of Materials Science and Chemical Engineering Politecnico di Torino Torino Italy Department of Electrical and Computer Engineering Royal Military College of Canada Kingston ONT Canada

ISBN: (纸本)9781424449675

In this paper, the possibility of employing a microstrip based technology periodic structure for the purpose of low cost sensing is discussed. The CAD model for the purposed device is discussed. Moreover, the electromagnetic response of such a fixed-geometry passive structure can vary when the characteristics of a single layer or several layers fluctuate due an external stimulus. For example, by observing the antenna response due to a variation in the covering of a single rectangular patch antenna the physical, chemical and/or mechanical variations within a given environment can be monitored. Similar concepts and observation techniques are purposed for the investigated structure by monitoring the change in reflection losses or other antenna characteristics.

关键词： Dielectric constant Periodic structures Monitoring Microstrip Geometry Surface waves

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Two-Dimensional Bas/Gec Van Der Waals Heterostructures: A Widely Tunable Photocatalyst for Water Splitting and Hydrogen Production

SSRN

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SSRN 2022年

作者： Islam, Md. Rasidul Islam, Md. Sherajul Zamil, Md. Yasir Ferdous, Naim Stampfl, Catherine Park, Jeongwon Jamalpur2012 Bangladesh Department of Electrical and Electronic Engineering Khulna University of Engineering & Technology Khulna9203 Bangladesh Department of Electrical and Biomedical Engineering University of Nevada RenoNV89557 United States Department of Materials Science and Engineering Khulna University of Engineering & Technology Khulna9203 Bangladesh School of Physics The University of Sydney NSW2006 Australia School of Electrical Engineering and Computer Science University of Ottawa OttawaONK1N 6N5 Canada

Of late, two-dimensional van der Waals heterostructures (vdWHs) have gained tremendous attention for water-splitting to produce hydrogen (H2) fuel. This work demonstrates various configurations of vdWHs made up of monolayer boron arsenide (BAs) and germanium carbide (GeC) that exhibit outstanding photocatalytic properties in the water-splitting process to generate H2 fuel. The absorption coefficient of the proposed BAs/GeC vdWHs is more than 105 cm-1, which exceeds the extensive conversion efficiency of optoelectronic materials. The absorption coefficient can be further tuned and reaches a maximum value of [[EQUATION]] cm-1 when an external strain is applied. Dynamically tunable bandgaps in the range of 0.78 to 2.02 eV are found in these vdWHs by applying a biaxial strain. A strong photocatalytic water splitting action throughout the ultraviolet to optical spectrum region is found when a biaxial strain of -6% to +6% is applied. The favorable characteristics of the proposed BAs/GeC vdWHs could help enhance H2 fuel generation via water splitting. © 2022, The Authors. All rights reserved.

关键词： Density functional theory

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Why In2O3 can make 0.7 nm atomic layer thin transistors?

arXiv

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arXiv 2020年

作者： Si, Mengwei Hu, Yaoqiao Lin, Zehao Sun, Xing Charnas, Adam Zheng, Dongqi Lyu, Xiao Wang, Haiyan Cho, Kyeongjae Ye, Peide D. School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Department of Materials Science and Engineering The University of Texas at Dallas RichardsonTX75080 United States School of Materials Engineering Purdue University West LafayetteIN47907 United States

In this work, we demonstrate enhancement-mode field-effect transistors by atomic-layer-deposited (ALD) amorphous In2O3 channel with thickness down to 0.7 nm. Thickness is found to be critical on the materials and electron transport of In2O3. Controllable thickness of In2O3 at atomic scale enables the design of sufficient 2D carrier density in the In2O3 channel integrated with the conventional dielectric. The threshold voltage and channel carrier density are found to be considerably tuned by channel thickness. Such phenomenon is understood by the trap neutral level (TNL) model where the Fermi-level tends to align deeply inside the conduction band of In2O3 and can be modulated to the bandgap in atomic layer thin In2O3 due to quantum confinement effect, which is confirmed by density function theory (DFT) calculation. The demonstration of enhancement-mode amorphous In2O3 transistors suggests In2O3 is a competitive channel material for back-end-of-line (BEOL) compatible transistors and monolithic 3D integration applications. © 2020, CC BY.

关键词： Oxide semiconductors

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Superiorization of preconditioned conjugate gradient algorithms for tomographic image reconstruction

arXiv

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arXiv 2018年

作者： Helou, Elias S. Herman, Gabor T. Lin, Chuan Zibetti, Marcelo V.W. Institute of Mathematical Science and Computation University of São Paulo SP Brazil Department of Computer Science Graduate Center City University of New York NY United States School of Electrical Engineering Southwest Jiaotong University Chengdu China Program in Electrical and Computer Engineering Federal University of Technology PR Brazil

Properties of Superiorized Preconditioned Conjugate Gradient (SupPCG) algorithms in image reconstruction from projections are examined. Least squares (LS) is usually chosen for measuring data-inconsistency in these inverse problems. Preconditioned Conjugate Gradient algorithms are fast methods for finding an LS solution. However, for ill-posed problems, such as image reconstruction, an LS solution may not provide good image quality. This can be taken care of by superiorization. A superiorized algorithm leads to images with the value of a secondary criterion (a merit function such as the total variation) improved as compared to images with similar data-inconsistency obtained by the algorithm without superiorization. Numerical experimentation shows that SupPCG can lead to high-quality reconstructions within a remarkably short time. A theoretical analysis is also provided.15A29, 65F22, 65F10, 94A08 Copyright © 2018, The Authors. All rights reserved.

关键词： Image reconstruction

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Asymmetric Electrode Structure Induces Dual-Channel Phenomenon Under Hot-Carrier Stress in Organic Thin-Film Transistors

IEEE Electron Device Letters

引用

IEEE Electron Device Letters 2023年第9期44卷 1496-1499页

作者： Tu, Yu-Fa Huang, Jen-Wei Chang, Ting-Chang Hung, Yang-Hao Lu, I-Nien Zhou, Kuan-Ju Sun, Li-Chuan Chen, Yu-An Wu, Chia-Chuan Hung, Wei-Chieh Lee, Jason Lien, Chen-Hsin The Institute of Electronics Engineering National Tsing Hua University Hsinchu30013 Taiwan Republic of China Military Academy The Department of Physics Kaohsiung83059 Taiwan National Sun Yat-sen University The Center of Crystal Research College of Semiconductor and Advanced Technology Research The Department of Physics Kaohsiung80424 Taiwan National Sun Yat-sen University The Department of Physics Kaohsiung80424 Taiwan National Sun Yat-sen University The Department of Photonics Kaohsiung80424 Taiwan National Sun Yat-sen University The Department of Materials and Optoelectronic Science Kaohsiung80424 Taiwan National Sun Yat-sen University The Department of Electrical Engineering Kaohsiung80424 Taiwan Boston University The Department of Computer Science BostonMA02215 United States

This study investigates the electrical mechanisms of the organic thin-film transistor (OTFT) with an asymmetric U-I electrode structure under hot-carrier stress (HCS). The threshold voltage shifts negatively and a dual-channel phenomenon occurs. In addition, the degradation behaviors of the linear and saturated ID-VG transfer curves are different. These are attributed to the non-uniform electric-field and heat distribution, which results in the non-uniform trapped holes in the organic-gate insulator-1 by charge trapping model during HCS. Finally, physical mechanisms based on COMSOL simulations and energy bands are proposed to clarify the degradation phenomena. © 1980-2012 IEEE.

关键词： Threshold voltage

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Template-Synthesis of Conjugated Poly(3-Hexylselenophene) (P3HS) Nanofibers Using Femtosecond Laser Machined Fused Silica Templates

Template-Synthesis of Conjugated Poly(3-Hexylselenophene) (P...

引用

MRS Advances

作者： Costa, L. Al-Hashimi, M. Heeney, M. Terekhov, A. Rajput, D. Hofmeister, W. Verma, A. Department of Materials Science and Engineering University of Tennessee - Knoxville TullahomaTN37388 United States Center for Laser Applications University of Tennessee Space Institute TullahomaTN37388 United States Department of Chemistry Texas AandM University at Qatar P.O. Box 23874 Doha Qatar Department of Chemistry and Centre for Plastic Electronics Imperial College London LondonSW7 2AZ United Kingdom Department of Electrical Engineering and Computer Science Texas AandM University - Kingsville KingsvilleTX78363 United States

We report on the preparation of conjugated polymer nanofibers via template-synthesis. A femtosecond laser machined fused silica template, with a micro-patterned array of high-aspect ratio surface nanopores, was first spin-coated with a polyvinyl alcohol (PVA) solution to form a water-soluble release layer. The PVA-lined template was then coated with a conjugated poly(3-hexylselenophene) (P3HS) - solvent solution. The solvent was allowed to dissipate, and the resulting {template / PVA liner / conjugated P3HS film} stack was then submerged in water to dissolve the PVA and release the conjugated polymer film from the template. The resulting conjugated polymer film exhibits an array of micro-patterned polymer nanofibers that constitute a negative replica of the PVA-lined template. The nanofibers come arranged in a vertical architecture that spans over the surface of the supporting film. © 2017 materials Research Society.

关键词： Conjugated polymers

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Observation of ultrastrong magnon-magnon coupling in YFeO3 using terahertz magnetospectroscopy

Observation of ultrastrong magnon-magnon coupling in YFeO3 u...

引用

CLEO: QELS_Fundamental science, CLEO_QELS 2020

作者： Makihara, Takuma Timothy Noe, G. Li, Xinwei Hayashida, Kenji Peraca, Nicolas Marquez Tian, Kevin Ma, Xiaoxuan Jin, Zuanming Ren, Wei Ma, Guohong Cao, Shixun Katayama, Ikufumi Takeda, Jun Turchinovich, Dmitry Nojiri, Hiroyuki Bamba, Motoaki Kono, Junichiro Department of Physics and Astronomy Rice University HoustonTX United States Department of Electrical and Computer Engineering Rice University HoustonTX United States Department of Physics International Center of Quantum and Molecular Structures Materials Genome Institute Shanghai University Shanghai200444 China Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama Japan Fakultät für Physik Universität Bielefeld Universitätsstr. 25 Bielefeld33615 Germany Institute for Materials Research Tohoku University Sendai Japan Department of Physics Kyoto University Sakyo-ku Kyoto606-8502 Japan PRESTO Japan Science and Technology Agency Saitama332-0012 Japan Department of Materials Science and NanoEngineering Rice University HoustonTX United States

We studied magnon-magnon ultrastrong coupling in YFeO3 using terahertz magnetospectroscopy in magnetic fields up to 30 T, which led to an extreme breakdown of the rotating-wave approximation where the counter-rotating... 详细信息

ISBN: (数字)9781943580767

ISBN: (纸本)9781943580767

关键词： Iron compounds

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Cation and anion topotactic transformations in cobaltite thin films leading to Ruddlesden-Popper phases

引用

Physical Review materials 2021年第6期5卷 064416-064416页

作者： I-Ting Chiu Min-Han Lee Shaobo Cheng Shenli Zhang Larry Heki Zhen Zhang Yahya Mohtashami Pavel N. Lapa Mingzhen Feng Padraic Shafer Alpha T. N'Diaye Apurva Mehta Jon A. Schuller Giulia Galli Shriram Ramanathan Yimei Zhu Ivan K. Schuller Yayoi Takamura Department of Chemical Engineering University of California Davis Davis California 95616 USA Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA Department of Physics and Center for Advanced Nanoscience University of California San Diego La Jolla California 92093 USA Condensed Matter Physics and Materials Science Division Brookhaven National Laboratory Upton New York 11973 USA Pritzker School of Molecular Engineering The University of Chicago Chicago Illinois 60637 USA Materials Department University of California Santa Barbara Santa Barbara California 93106 USA School of Materials Engineering Purdue University West Lafayette Indiana 47907 USA Department of Electrical and Computer Engineering University of California Santa Barbara Santa Barbara California 93106 USA Department of Materials Science and Engineering University of California Davis Davis California 95616 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Materials Science Division and Center for Molecular Engineering Argonne National Laboratory Lemont Illinois 60439 USA

Topotactic transformations involve structural changes between related crystal structures due to a loss or gain of material while retaining a crystallographic relationship. The perovskite oxide La0.7Sr0.3CoO3 (LSCO) is an ideal system for investigating phase transformations due to its high oxygen vacancy conductivity, relatively low oxygen vacancy formation energy, and strong coupling of the magnetic and electronic properties to the oxygen stoichiometry. While the transition between cobaltite perovskite and brownmillerite (BM) phases has been widely reported, further reduction beyond the BM phase lacks systematic studies. In this paper, we study the evolution of the physical properties of LSCO thin films upon exposure to highly reducing environments. We observe the rarely reported crystalline Ruddlesden-Popper phase, which involves the loss of both oxygen anions and cobalt cations upon annealing where the cobalt is found as isolated Co ions or Co nanoparticles. First-principles calculations confirm that the concurrent loss of oxygen and cobalt ions is thermodynamically possible through an intermediary BM phase. The strong correlation of the magnetic and electronic properties to the crystal structure highlights the potential of utilizing ion migration as a basis for emerging applications such as neuromorphic computing.

关键词： Crystal defects electrical conductivity Electronic structure of atoms & molecules Epitaxial strain First-principles calculations Magnetism Phase transitions

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Coherent Control of GHz Resonant Modes by an Integrated Acoustic Etalon

引用

Physical Review Letters 2013年第8期110卷 086109-086109页

作者： Huarui Sun Vladimir A. Stoica Max Shtein Roy Clarke Kevin P. Pipe Department of Mechanical Engineering University of Michigan Ann Arbor Michigan 48109-2125 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Center for Solar and Thermal Energy Conversion (CSTEC) University of Michigan Ann Arbor Michigan 48109 USA Department of Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109-2136 USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109-2122 USA

By carefully tuning the thickness of a compliant thin film placed within an acoustic cavity, we achieve coherent control of the cavity’s acoustic resonances, analogous to the operation of an optical etalon. This technique is demonstrated using a supported membrane oscillator in which multiple high-frequency harmonic resonances are simultaneously optoexcited by an ultrafast laser. Theoretical and computational methods are used to analyze the selective strengthening or suppression of these resonances by constructive or destructive interference.

关键词： THIN films ACOUSTIC resonance ELECTROMAGNETIC interference RESONATORS ACOUSTIC spectroscopy FREQUENCY spectra

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Impact of CLAHE-based image enhancement for diabetic retinopathy classification through deep learning

引用

Procedia computer science 2023年 216卷 57-66页

作者： Mira Hayati Kahlil Muchtar Roslidar Novi Maulina Irfan Syamsuddin Gregorius Natanael Elwirehardja Bens Pardamean Department of Electrical and Computer Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia Telematics Research Center (TRC) Universitas Syiah Kuala Banda Aceh 23111 Indonesia Faculty of Medicine Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Computer and Networking Engineering Politeknik Negeri Ujung Pandang Makassar 90245 Indonesia Bioinformatics and Data Science Research Center Bina Nusantara University Jakarta 11480 Indonesia Computer Science Department BINUS Graduate Program – Master of Computer Science Program Bina Nusantara University Jakarta 11480 Indonesia

Diabetic retinopathy (DR) is a type of diabetes mellitus that attacks the retina of the eye. DR will cause patients to experience blindness slowly. Generally, DR can be detected by using a special instrument called an ophthalmoscope to view the inside of the eyeball. However, in conditions where there is a very small difference between the normal image and the DR image, computer-based assistance is needed for maximizing image reading value. In this research, a method of image quality improvement will be carried out which will then be integrated with a classification algorithm based on deep learning. The results of image improvement using Contrast Limited Adaptive Histogram Equalization (CLAHE) shows that the average accuracy of the method on several models is very competitive, 91% for the VGG16 model, 95% for InceptionV3, and 97% for EfficientNet compared to the results original image which only has an accuracy of 87% for VGG16 model, 90% for InceptionV3 model, and 95% for EfficientNet. However, in ResNet34 better accuracy is obtained in the original image with an accuracy of 95% while in the CLAHE image the accuracy value is only 84%. The results of this comprehensive evaluation and recommendation of famous backbone networks can be useful in the computer-aided diagnosis of diabetic retinopathy.

关键词： Diabetic retinopathy Deep Learning CNN Image Enhancement CLAHE

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