检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Cai, Ziqiang Zhang, Xianzhe Karnik, Tushar Sanjay Xu, Yihao Kim, Tae Yoon Hu, Juejun Liu, Yongmin Department of Electrical and Computer Engineering Northeastern University BostonMA02115 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Mechanical and Industrial Engineering Northeastern University BostonMA02115 United States

Metasurfaces have become one of the most prominent research topics in the field of optics owing to their unprecedented properties and novel applications on an ultrathin platform. By combining graphene with metasurfaces, electrical tunable functions can be achieved with fast tuning speed, large modulation depth and broad tuning range. However, the tuning efficiency of hybrid graphene metasurfaces within the short-wavelength infrared (SWIR) spectrum is typically low because of the small resonance wavelength shift in this wavelength range. In this work, through the integration of graphene and silicon metasurfaces that support quasi-bound states in the continuum (quasi-BIC), we experimentally demonstrate significant transmittance tuning even with less than 30 nm resonance wavelength shift thanks to the high quality-factor of quasi-BIC metasurfaces. The tunable transmittance spectrum was measured using Fourier Transform Infrared Spectroscopy (FTIR) with a modified reflective lens to improve the accuracy, and the electrical tuning was realized utilizing the "cut-and-stick" method of ion gel. At the wavelength of 3.0 µm, the measured change of transmittance ΔT = Tmax − Tmin and modulation depth ΔT/Tmax can reach 22.2% and 28.9%, respectively, under a small bias voltage ranging from -2 V to +2 V. To the best of our knowledge, this work is the first experimental demonstration of tunable graphene/quasi-BIC metasurfaces, which have potential applications in optical modulation, reconfigurable photonic devices, and optical communications. Copyright © 2024, The Authors. All rights reserved.

关键词： Graphene

来源：评论

学校读者我要写书评

暂无评论

Temperature Dependent Low-Frequency Noise Characteristics of NiOx/β-Ga2O3 p-n Heterojunction Diodes

arXiv

引用

arXiv 2023年

作者： Ghosh, Subhajit Mudiyanselage, Dinusha Herath Kargar, Fariborz Zhao, Yuji Fu, Houqiang Balandin, Alexander A. Department of Electrical and Computer Engineering University of California RiversideCA92521 United States School of Electrical Computer and Energy Engineering Arizona State University TempeAZ85287 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Los AngelesCA90095 United States

We report on the temperature dependence of the low-frequency electronic noise in NiOx/βGa2O3 p-n heterojunction diodes. The noise spectral density is of the 1/f-type near room temperature but shows signatures of Lorentzian components at elevated temperatures and at higher current levels (f is the frequency). We observed an intriguing non-monotonic dependence of the noise on temperature near T = 380 K. The Raman spectroscopy of the device structure suggests material changes, which results in reduced noise above this temperature. The normalized noise spectral density in such diodes was determined to be on the order of 10–14 cm2/Hz (f = 10 Hz) at 0.1 A/cm2 current density. In terms of the noise level, NiOx/β-Ga2O3 p-n diodes occupy an intermediate position among devices of various designs implemented with different ultra-wide-bandgap semiconductors. The obtained results are important for understanding the electronic properties of NiOx/β-Ga2O3 heterojunctions and contribute to the development of noise spectroscopy as the quality assessment tool for new electronic materials and device technologies. Copyright © 2023, The Authors. All rights reserved.

关键词： Electronic properties

来源：评论

学校读者我要写书评

暂无评论

A Position Control System for a Single-port Laparoscopic Manipulating Robot

A Position Control System for a Single-port Laparoscopic Man...

引用

2022 International electrical engineering Congress, iEECON 2022

作者： Sonsilphong, Amornthep Sonsilphong, Suphachoke Soemphol, Chaiyong Hormdee, Daranee Khampitak, Kovit Rajamangala University of Technology Isan Department of Electrical Engineering Khon Kean Thailand Khon Kaen University Data Science Health Informatics Program Faculty of Medicine Khon Kaen Thailand Mahasarakham University Faculty of Engineering Department of Electrical Engineering Mahasarakham Thailand Khon Kaen University Embedded System RD Group Computer Engineering Faculty of Engineering Khon Kaen Thailand Khon Kean University Faculty of Medicine Department of Obstetrics and Gynecology Khon Kean Thailand

ISBN: (纸本)9781665402064

The research herein proposes a position control system, designed for a single-port surgical robot, based on the lockup table method. The programmable logic controller (PLC) was implemented to move the single- port surgical robot and handle laparoscope and surgical instruments with feedback control. The output responses of the desired angle were investigated under several conditions. The rotating angle allows movement of the laparoscope in the range of -10o to +10o. The error of the desired position of the designed system was less than approximately ± 0.1o. Moreover, the output data from several experiments may be employed to improve the open-loop control systems. This system is also capable of providing computer vision task implementation, enabling semi- automatic or automatic surgery in the future. © 2022 IEEE.

关键词： Laparoscopy

来源：评论

学校读者我要写书评

暂无评论

Colossal Birefringence from Periodic Structural Modulations

Colossal Birefringence from Periodic Structural Modulations

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Mei, Hongyan Ren, Guodong Zhao, Boyang Salman, Jad Jung, Gwan-Yeong Chen, Huandong Thind, Arashdeep S. Cavin, John Hachtel, Jordan A. Chi, Miaofang Niu, Shanyuan Joe, Graham Wan, Chenghao Settineri, Nick Teat, Simon J. Chakoumakos, Bryan C. Ravichandran, Jayakanth Mishra, Rohan Kats, Mikhail A. Department of Electrical and Computer Engineering University of Wisconsin-Madison MadisonWI53706 United States Institute of Materials Science and Engineering Washington University in St. Louis St. LouisMO63130 United States Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los AngelesCA90089 United States Department of Mechanical Engineering and Material Science Washington University in St. Louis St. LouisMO63130 United States Department of Physics Washington University in St. Louis St. LouisMO63130 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37830 United States Department of Materials Science and Engineering University of Wisconsin-Madison MadisonWI53706 United States Advanced Light Source Lawrence BerkeleyNational Laboratory BerkeleyCA94720 United States Neutron Scattering Division Oak Ridge NationalLaboratory Oak RidgeTN37830 United States Ming Hsieh Department of Electrical Engineering University of Southern California Los AngelesCA90089 United States

We introduce structural modulation as a new mechanism for achieving colossal optical anisotropy. Modulated nonstoichiometric material Sr9/8TiS3 is shown to have an extraordinary refractive index ne = 4.5 and ordinary ... 详细信息

ISBN: (纸本)9781957171258

关键词： Refractive index

来源：评论

学校读者我要写书评

暂无评论

Paramagnon heat capacity and anomalous thermopower in anisotropic magnetic systems: Understanding interlayer spin correlations in a magnetically disordered phase

引用

Physical Review B 2024年第5期109卷 054418-054418页

作者： Fatemeh Heydarinasab Morteza Jazandari Md Mobarak Hossain Polash Jahanfar Abouie Daryoosh Vashaee Department of Physics Faculty of Science University of Sistan and Baluchestan Zahedan 98167-45845 Iran Department of Physics Institute for Advanced Studies in Basic Sciences (IASBS) Zanjan 45137-66731 Iran Department of Materials Science and Engineering North Carolina State University Raleigh North Carolina 27606 USA Department of Electrical and Computer Engineering North Carolina State University Raleigh North Carolina 27606 USA

The interplay between entropy transport and charge carriers–paramagnon interaction in the Onsager linear system has been a subject of debate due to the limited theoretical and experimental understanding of paramagnon heat capacity. In this study, we investigate this interplay in an anisotropic layered magnetic system using cluster mean-field theory with spin quantum correlations. By examining spin correlation functions between different spins with various types of clustering, we derive the spin correlation function as a function of distance and temperature for the interlayer clusters both below and above the magnetic order phase transition. Our analysis reveals that paramagnons characterized by pronounced spin correlations among interlayer nearest-neighbor spins exhibit a nonzero heat capacity, providing valuable insights into the dynamics of entropy transport. The findings align with experimental observations, lending strong support to the validity of the paramagnon-drag thermopower concept. This study sheds light on the intricate dynamics and thermodynamic properties of paramagnons, advancing our understanding of entropy transport in complex systems.

关键词： Entropy Specific heat Spin dynamics Thermoelectric effects

来源：评论

学校读者我要写书评

暂无评论

Soliton Vortex Comb Generation in an AlGaAs Microresonator for Self-Torque Pulse Synthesis

Soliton Vortex Comb Generation in an AlGaAs Microresonator f...

引用

CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Liu, Y. Chen, B. Zhou, Y. Ye, C. Cao, Q. Huang, P. Kim, C. Zheng, Y. Oxenløwe, L.K. Yvind, K. Li, J. Li, J. Zhang, Y. Dong, C. Fu, S. Zhan, Q. Wang, X. Liu, J. Pu, M. DTU Electro Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark State Key Laboratory of Optoelectronic Materials and Technologies School of Physics School of Electronics and Information Technology Sun Yat-sen University Guangzhou China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai China Zhangjiang Laboratory Shanghai China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen China

We demonstrate bright soliton generation at room temperature within a grating-dressed AlGaAs-on-insulator microresonator and the simultaneous emission of phase-locked vortices, enabling the synthesis of self-torque pu... 详细信息

关键词： Microresonators

来源：评论

学校读者我要写书评

暂无评论

Lightweight Pedestrian Detection through Guided Filtering and Deep Learning 10

Lightweight Pedestrian Detection through Guided Filtering an...

引用

10th IEEE Global Conference on Consumer Electronics, GCCE 2021

作者： Muchtar, Kahlil Saddami, Khairun Bintang, Akhyar Cenggoro, Tjeng Wawan Pardamean, Bens Lin, Chih-Yang Ernita, Tia Universitas Syiah Kuala Department of Electrical And Computer Engineering Aceh Indonesia Universitas Syiah Kuala Department of Electrical And Computer Engineering Aceh Indonesia Bina Nusantara University School of Computer Science Bina Nusantara University Bioinformatics And Data Science Research Center Computer Science Department Jakarta Indonesia Bina Nusantara University BINUS Graduate Program-Master of Computer Science Program Bina Nusantara University Bioinformatics And Data Science Research Center Computer Science Department Jakarta Indonesia Yuan-Ze University Department of Electrical And Engineering Taoyuan Taiwan

ISBN: (纸本)9781665436762

In this paper, we propose a novel approach to locate and detect moving pedestrians in a video. Our proposed method first locates the region of interest (ROI) using a background subtraction algorithm based on guided filtering. This novel background subtraction algorithm allows our method to also filter unexpected noises at the same time, which could benefit the performance of our proposed method. Subsequently, the pedestrians are detected using YOLOv3 within the provided ROI. Our experiments showed that the proposed method has a competitive performance in the CDNET2014 dataset with a fast-processing time. © 2021 IEEE.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Electron Dynamics of Femtosecond Laser Induced Plasma Inside Multilayer Dielectric High Reflectors Studied Using Particle-in-Cell (PIC) Approach

Electron Dynamics of Femtosecond Laser Induced Plasma Inside...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Ziyao Su Joseph R. Smith Enam Chowdhury Department of Materials Science and Engineering The Ohio State University Columbus OH Department of Physics Marietta College Marietta OH Department of Electrical and Computer Engineering The Ohio State University Columbus OH Department of Physics The Ohio State University Columbus OH

The strong field ionized electron motion and energy in the interaction of few-cycle femtosecond laser and SiO 2 /HfO 2 -based multilayer dielectric reflector designed for 800nm is studied using the PIC method incorpor... 详细信息

ISBN: (纸本)9798350369311

关键词： Laser theory Ionization Dynamics Lasers and electrooptics Nonhomogeneous media Dielectrics Plasmas Electro-optical waveguides Electrons

来源：评论

学校读者我要写书评

暂无评论

MULTISCALE PHYSICS-INFORMED NEURAL NETWORKS FOR THE INVERSE DESIGN OF HYPERUNIFORM OPTICAL materials

arXiv

引用

arXiv 2024年

作者： Riganti, Roberto Zhu, Yilin Cai, Wei Torquato, Salvatore Negro, Luca Dal Physics Department Boston University Boston United States Division of Materials Science & Engineering Boston University Boston United States Department of Mathematics Southern Methodist University Dallas United States Department of Chemistry Department of Physics Princeton Materials Institute Princeton University Princeton United States Department of Electrical & Computer Engineering Division of Materials Science & Engineering Physics Department Photonics Center Boston University Boston United States

In this article, we employ multiscale physics-informed neural networks (MscalePINNs) for the inverse design of finite-size photonic materials with stealthy hyperuniform (SHU) disordered geometries. Specifically, we show that MscalePINNs can capture the fast spatial variations of complex fields scattered by arrays of dielectric nanocylinders arranged according to isotropic SHU point patterns, thus enabling a systematic methodology to inversely retrieve their effective dielectric profiles. Our approach extends the recently developed high-frequency homogenization theory of hyperuniform media and retrieves more general permittivity profiles for applications-relevant finite-size SHU systems, unveiling unique features related to their isotropic nature. In particular, we numerically corroborate the existence of a transparency region beyond the long-wavelength approximation, enabling effective and isotropic homogenization even without disorder-averaging, in contrast to the case of uncorrelated Poisson random patterns. The flexible multiscale network approach introduced here enables the efficient inverse design of more general effective media and finite-size optical metamaterials with isotropic electromagnetic responses beyond the limitations of traditional homogenization theories. Copyright © 2024, The Authors. All rights reserved.

关键词： Inverse problems

来源：评论

学校读者我要写书评

暂无评论

High thermoelectric power factor in Ni-Fe alloy for active cooling applications

arXiv

引用

arXiv 2025年

作者： Li, Shuai Das, Sree Sourav Wang, Haobo Bati, Sujit Balachandran, Prasanna V. Shiomi, Junichiro Floro, Jerrold A. Zebarjadi, Mona Department of Materials Science and Engineering University of Virginia CharlottesvilleVA22904 United States Electrical and Computer Engineering Department University of Virginia CharlottesvilleVA22904 United States Department of Physics University of Virginia CharlottesvilleVA22904 United States Department of Mechanical Engineering University of Tokyo Tokyo Japan

Metallic thermoelectric materials are promising candidates for active cooling applications, where high thermal conductivity and a high thermoelectric power factor are essential to maximize effective thermal conductivity. While metals inherently possess high thermal and electrical conductivities, they typically exhibit low Seebeck coefficients. In this work, we create a database and apply machine learning techniques to identify metallic binary alloys with large Seebeck coefficients. Specifically, we identify Ni-Fe as a promising candidate for active cooling. We then fabricate Ni-Fe ingots and demonstrate thermoelectric power factor values as high as 120 μW/cm·K2 at 200 K for these stable alloys, which are composed of cost-effective and abundant elements. Furthermore, we show that the effective thermal conductivity of these alloys, under small temperature differences, can exceed that of pure copper at temperatures above 250 K. Copyright © 2025, The Authors. All rights reserved.

关键词： Iron alloys

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：