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Robust Multiplexing with Topolectrical Higher-Order Chern Insulators

Physical Review Applied 2020年第6期13卷 064031-064031页

作者： Xiang Ni Zhicheng Xiao Alexander B. Khanikaev Andrea Alù Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Physics Program Graduate Center of the City University of New York New York New York 10016 USA Department of Electrical and Computer Engineering University of Texas at Austin Austin Texas 78703 USA Department of Electrical Engineering Grove School of Engineering City College of the City University of New York 140th Street and Convent Avenue New York New York 10031 USA

We explore an implementation of a higher-order Chern insulator in a topolectrical circuit as a platform to implement robust signal multiplexing. By utilizing basic circuit layouts that realize the required complex hopping between neighboring lattice sites, we demonstrate different topological phases in a three-dimensional topolectrical circuit, including a Wannier-based Chern insulator and a crystalline topological phase. The topological chiral hinge states supported by the circuit are nonreciprocal and avoid propagation to the hinge opposite the excitation. Such an unusual response can be explained in terms of a synthetic gauge field of the circuit lattice, enabling multiplexing inherently robust to defects.

关键词： Chern insulators Edge states Metamaterials Devices Topological materials PT-symmetry

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Magnetically Tuned Continuous Transition from Weak to Strong Coupling in Terahertz Magnon Polaritons

arXiv

引用

arXiv 2022年

作者： Baydin, Andrey Hayashida, Kenji Makihara, Takuma Tay, Fuyang Ma, Xiaoxuan Ren, Wei Ma, Guohong Noe, G. Timothy Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Cao, Shixun Bamba, Motoaki Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States The Smalley-Curl Institute Rice University HoustonTX77005 United States Division of Applied Physics Graduate School of Engineering Hokkaido University Hokkaido Sapporo060-8628 Japan Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 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 Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan The Hakubi Center for Advanced Research Kyoto University Kyoto606-8502 Japan Department of Physics I Kyoto University Kyoto606-8502 Japan PRESTO Japan Science and Technology Agency Kawaguchi332-0012 Japan Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak- or strong-coupling regime. Here, we present a unique system where the coupling rate continuously increases with an externally applied magnetic field while the dissipation rate remains constant, allowing us to monitor a weak-to-strong coupling transition as a function of magnetic field. We observed a Rabi splitting of a terahertz magnon mode in yttrium orthoferrite above a threshold magnetic field of ∼14 T. Based on a microscopic theoretical model, we show that with increasing magnetic field the magnons transition into magnon polaritons through an exceptional point, which will open up new opportunities for in situ control of non-Hermitian systems. Copyright © 2022, The Authors. All rights reserved.

关键词： Polariton

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Personnel System Development with Integrated Military Education Information System (MEIS) in Supporting the Personnel Position and Career

Personnel System Development with Integrated Military Educat...

引用

International Conference on ICT For Smart Society (ICISS)

作者： Leli Setyaningrum Suhono H. Supangkat Harco Leslie Hendric Spits Warnars Juneman Abraham Edi Abdurachman Bina Nusantara University Jakata Barat Indonesia School of Electrical Engineering and Informatics Institut Teknologi Bandung Bandung Indonesia Graduate Program Doctor of Computer Science Bina Nusantara University Jakarta Indonesia Faculty of Humanities Bina Nusantara University BINUS Jakarta Indonesia

ISBN: (数字)9781665404228

ISBN: (纸本)9781665404235

Personnel and education data very important for organizations, including the military. All data related to military personnel will give effect positions and careers in the military field. The integration of personnel and education data can assist in processing and decision making. An analysis is needed so that the developed system can be useful for the long term. Analysis with IT balanced scorecard and COBIT ® 2019, will be able to help and fill the gaps in the existing system based on the objectives of the military organization itself. It is shown that the domains BAI05 (Managed Organizational Change) and DSS02 (Managed Service Requests and Incidents) are still not being implemented well. The system developed will have the features and capabilities to support the organization in achieving its goals, including in the field of staffing and education. Besides, it provides convenience in making decisions in terms of positions related to personnel careers.

关键词： Personnel Education Organizations Task analysis Information technology engineering profession computer science

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Universal Active Power Filter Based on Three Three-Leg Converters and a Single DC-link

Universal Active Power Filter Based on Three Three-Leg Conve...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Phelipe L. S. Rodrigues Cursino B. Jacobina Andre E. L. Costa Ítalo A. Cavalcanti de Oliveira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) Paraíba Brazil Department of Electrical Engineering Federal University of Campina Grande (UFCG) Paraíba Brazil

This paper presents a universal active power filter (UAPF) for harmonic and sag/swell voltage compensation based on the nine-leg converter and a single dc-link. The proposed UAPF combines three three-phase converters operating as series-shunt-series filters. An SV-PWM technique was used to improve the voltage levels generated by the converters by obtaining multilevel voltages. The connection made in the topology proposed in this paper allows an improvement in the harmonic distortions as well as the semiconductors losses. The complete control system is developed, simulation and experimental results are shown for validation purposes.

关键词： Topology Harmonic analysis Impedance Harmonic distortion Load modeling Active filters Power system harmonics

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Advanced phase-change materials for enhanced meta-displays

arXiv

引用

arXiv 2021年

作者： Hemmatyar, Omid Abdollahramezani, Sajjad Lepeshov, Sergey Krasnok, Alex Brown, Tyler Alù, Andrea Adibi, Ali School of Electrical and Computer Engineering Georgia Institute of Technology 778 Atlantic Drive NW AtlantaGA30332-0250 United States ITMO University St. Petersburg197101 Russia Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States

Structural colors generated due to light scattering from static all-dielectric metasurfaces have successfully enabled high-resolution, high-saturation and wide-gamut color printing applications. Despite recent advances, most demonstrations of these structure-dependent colors lack post-fabrication tunability that hinders their applicability for front-end dynamic display technologies. Phase-change materials (PCMs), with significant contrast of their optical properties between their amorphous and crystalline states, have demonstrated promising potentials in reconfigurable nanophotonics. Herein, we leverage a tunable all-dielectric reflective metasurface made of a newly emerged class of low-loss optical PCMs with superb characteristics, i.e., antimony trisulphide (Sb2S3), antimony triselenide (Sb2Se3), and binary germanium-doped selenide (GeSe3), to realize switchable, high-saturation, high-efficiency and high-resolution structural colors. Having polarization sensitive building blocks, the presented metasurface can generate two different colors when illuminated by two orthogonally polarized incident beams. Such degrees of freedom (i.e., structural state and polarization) enable a single reconfigurable metasurface with fixed geometrical parameters to generate four distinct wide-gamut colors suitable for a wide range of applications, including tunable full-color printing and displays, information encryption, and anti-counterfeiting. © 2021, CC BY.

关键词： Phase change materials

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Cascaded Multilevel Rectifiers with Reduced Number of Controlled Switches for Open-End Winding PMSM

Cascaded Multilevel Rectifiers with Reduced Number of Contro...

引用

IEEE Energy Conversion Congress and Exposition

作者： Amanda P. Monteiro Cursino B. Jacobina Filipe A. C. Bahia Reuben P. R. Sousa Post-Graduate Program in Electrical Engineering - PPgEE/COPELE Campina Grande Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil

This paper proposes three configurations of unidirectional open-end winding (OEW) cascaded multilevel rectifiers with reduced number of controlled switches. They are based on Vienna rectifiers and are composed of a series combination of two three-phase converters and three H-bridges employing floating capacitors (per phase). These configurations make the ac-dc conversion power, supplied by a permanent magnet synchronous machine (PMSM), which is connected to the rectifier by an OEW configuration. Compared to the conventional, proposed systems synthesize the same or higher number of voltage levels using fewer number of controlled switches and is still possible to obtain lower converter current harmonic distortion. Furthermore, they can operate with lower switch blocking voltage ratio. These features make them attractive options to the industry due to their low costs, low control complexity and size, besides they are more reliable and less prone to failure. Therefore, proposed configurations have a better cost-benefit than conventional one. The system model, PWM technique, capacitor voltage balancing and control strategy are given. Simulation and experimental results are provided in order to validate their feasibility.

关键词： Capacitors Voltage control Switches Reliability Topology Bridge circuits

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Aperture-Coupled Koch Fractal on-Chip Antennas for 60 GHz ISM Band 2

Aperture-Coupled Koch Fractal on-Chip Antennas for 60 GHz IS...

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2nd IEEE MTT-S Latin America Microwave Conference, LAMC 2018

作者： Morais, Samuel Medeiros Araújo Serres, Alexandre Jean Rene Guarany, Ivana Soares Da Silverio Freire, Raimundo Carlos Da Silva, Paulo Fernandes Santana, Ewaldo Elder Carvalho Da Fonseca Silva, Paulo Henrique Post-Graduation Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil Post-Graduation Program in Computer Engineering and Systems State University of Maranhão São Luis Brazil Post-Graduation Program in Electrical Engineering Federal Institute of Education Science and Technology of Paraíba João Pessoa Brazil

ISBN: (纸本)9781538673331

This paper presents Koch fractal aperture-coupled patch antennas operating in industrial scientific and medical band at 60 GHz (57 GHz to 64 GHz), for on-chip application. This work is the continuation of the development of aperture-coupled antennas with aperture and patch element built in 2 μm-thick aluminum lying on two layers of silicon with a height of 200 μm. The use of Koch fractal allowed the development of aperture-coupled antennas of greater perimeter with more metal in the patch elements, which promoted an increase in the gain. The observed gain for Koch fractal level 2 was of 10.55 dBi, with a bandwidth of 7.23 GHz, covering the ISM 60 GHz Band, and an increase of less than 10% in total patch dimension. For Koch fractal levels 0 (square), a polarization close to circular was achieved, with an axial ratio less than 6 at resonant frequencies. © 2018 IEEE.

关键词： Natural frequencies

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Breast phantom design for X-ray phase-contrast imaging

引用

Research on Biomedical engineering 2019年第1期35卷 21-26页

作者： Badelli, Juliana do Carmo Ribeiro-Junior, Sebastião Antoniassi, Marcelo Conceição, Andre Luiz Coelho Graduate Program in Electrical and Computer Engineering - UTFPR Av. Sete de Setembro 3165 CuritibaParaná80230-901 Brazil Electrical Engineering Department Federal University of Paraná Rodovia BR-116 Km 98 no. 8813 Jardim das Américas CuritibaParaná81531-980 Brazil Physics Department Federal University of Technology - Paraná Av. Sete de Setembro 3165 CuritibaParaná80230-901 Brazil Deutsches Elektronen-Synchrotron DESY Notkestraße 85 Hamburg22607 Germany

Purpose: Breast cancer is one of the most diffuse diseases and its incidence rate is increasing. Mammography is the gold standard exam for screening breast cancer. Nevertheless, to provide better conditions for visualization and detection of tumors, in particular to young women, techniques exploiting the X-ray phase contrast to generate images have been studied and proposed for clinical use. As every imaging modality clinically implemented, the capabilities and limitations of an X-ray phase-contrast system dedicated to breast imaging should be evaluated by a phantom. Although for mammography, there are several commercial phantoms, for tomographic X-ray phase-contrast imaging systems dedicated to breast screening, they are absent. Therefore, this study aimed to design a breast phantom for application in phase-contrast computed tomography (PC-CT) imaging. Methods: A breast phantom dedicated to X-ray phase-contrast imaging was designed. The phantom has a cylindrical shape and is composed by PMMA, to mimic the breast of a young woman, with some inserts filled with tissue substitutes to normal and pathological breast tissues, such as ethanol and glycerol. These materials were chosen due to the similarity in the attenuation and scattering properties of normal and pathological human breast tissues. Results: A comparison between tomographic X-ray absorption imaging and tomographic X-ray phase-contrast imaging showed a significant increase in edges definition, even with materials with similar attenuation properties. Conclusion: The results of this work reinforce the need for dedicated phantoms to exploit the features of each imaging modality more realistic. In particular, the breast phantom–designed breast screening by PC-CT allows exploiting the features of this new imaging modality. © 2019, Sociedade Brasileira de Engenharia Biomedica.

关键词： Phantoms

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Design and energy assessment of a new hybrid solar drying dome - Enabling Low-Cost, Independent and Smart Solar Dryer for Indonesia Agriculture 4.0

引用

IOP Conference Series: Earth and Environmental Science 2022年第1期998卷

作者： F E Gunawan A S Budiman B Pardamean E Djuana S Romeli N Hananda C Harito D P B Aji D N N Putri Stevanus Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia 11480 Bioinformatics and Data Science Research Center Bina Nusantara University Jakarta 11480 Indonesia Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta Indonesia 11480 Electrical Engineering Department Faculty of Industrial Technology Universitas Trisakti Jakarta 11440 Indonesia PT. Impack Pratama Industri Jakarta Indonesia Industrial Engineering Department Faculty of Engineering Bina Nusantara University Jakarta 11480 Indonesia. Mechanical Engineering Department. Faculty of Industrial Technology Universitas Trisakti Jakarta 11440 Indonesia

Solar dryer is typically used for agricultural purposes in Indonesia. There are many economically important crops requiring storage or drying under particular environmental conditions such as temperature and humidity. High temperatures inside solar dryer prevents the growth of microorganism, and quickly reduce moisture content from the substance. A hybrid solar dryer is generally considered to provide the most optimum solution, however solar panels may be expensive and they still only provide heat or energy in the daytime. Hence, we propose here a new kind of hybrid solar dryer for 24/7 optimum conditions for crops - enabled by recent advances in energy technologies as well as Industry 4.0. This study aims to create an efficient, affordable and a self-sufficient intelligent energy system that will be applied to agriculture for storage or drying purposes by measuring the energy needs for the optimal drying system. Therefore, it is crucial to estimate and assess the critical energy needs for such new systems in order to optimize and design such smart solar dryer (SSD) system especially for Indonesia's agricultural needs. We use design experience of our industry partner (PT Impack Pratama Industri, Indonesia) who has been working extensively on such solar dryer dome (SDD) based on polycarbonate material (only solar irradiation, no other technologies) and theoretical framework based on first principles in thermodynamics to estimate and assess critical energy needs for such dome with all the smart technologies. The calculation was performed based on Mollier diagram and the result still a rough estimation of energy required.

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Sub-picosecond all-optical switching in a hybrid VO2:silicon waveguide at 1550 nm

arXiv

引用

arXiv 2020年

作者： Hallman, Kent A. Miller, Kevin J. Baydin, Andrey Weiss, Sharon M. Haglund, Richard F. Department of Physics and Astronomy Vanderbilt University NashvilleTN37235 United States Interdisciplinary Graduate Program in Materials Science NashvilleTN37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States AEgis Technologies Group 410 Jan Davis Drive HuntsvilleAL35803 United States Department of Electrical and Computer Engineering Rice University HoustonTX70005 United States

Achieving ultrafast all-optical switching in a silicon waveguide geometry is a key milestone on the way to an integrated platform capable of handling the increasing demands for higher speed and higher capacity for information transfer. Given the weak electro-optic and thermo-optic effects in silicon, there has been intense interest in hybrid structures in which that switching could be accomplished by integrating another material into the waveguide, including the phase-changing material, vanadium dioxide (VO2). It has long been known that the phase transition in VO2 can be triggered by ultrafast laser pulses, and that pump-laser fluence is a critical parameter governing the recovery time of thin films irradiated by femtosecond laser pulses near 800 nm. However, thin-film experiments are not a priori reliable guides to using VO2 for all-optical switching in on-chip silicon photonics because of the large changes in VO2 optical constants in the telecommunications band, the requirement of low insertion loss, and the limits on switching energy permissible in integrated photonic systems. Here we report the first measurements to show that the reversible, ultrafast photo-induced phase transition in VO2 can be harnessed to achieve sub-picosecond switching when small VO2 volumes are integrated in a silicon waveguide as a modulating element. Switching energies above threshold are of order 600 fJ/switch. These results suggest that VO2 can now be pursued as a strong candidate for all-optical switching with sub-picosecond on-off times. Copyright © 2020, The Authors. All rights reserved.

关键词： Optical switches

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