检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Zhang, Dongguo Sun, Fei Liu, Yichao Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China

To address the increasingly serious issue of noise pollution, we propose an ultra-broadband and wide-angle acoustic absorber based on a periodic acoustic rigid-metaporous composite array. Numerical simulation results verify the broadband good acoustic absorption performance of the proposed absorber, which can achieve an average absorption coefficient of approximately 90.9% within the frequency band from 500 to 4000 Hz with incident angles ranging from -75 to +75 degrees, thus compensating for the shortcomings of traditional acoustic absorbers that are not as effective at low frequencies. This work will provide a new approach for ultra-broadband and wide-angle acoustic wave absorption and noise suppression. Copyright © 2024, The Authors. All rights reserved.

关键词： Acoustic wave absorption

来源：评论

学校读者我要写书评

暂无评论

Port-controllable routing of orbital angular momentum modes using a rotatable diffractive neural network

引用

Science China(Physics,Mechanics & Astronomy) 2025年第6期68卷 154-163页

作者： Junmin Liu Jiafu Chen Qingji Zeng Zemin Liang Xinping Wu Xin Zhao Jiangnan Xiao Huapeng Ye Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical SystemTerahertz Science Cooperative Innovation CenterSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Orbital angular momentum(OAM)modes provide an additional orthogonal physical dimension,offering transformative potential for enhancing optical communication *** significant progress in mode multiplexing,the development of robust communication networks faces persistent challenges,particularly in effectively routing and controlling these multiplexed channels among network *** tackle these dilemmas,we propose a rotatable diffractive neural network(R-DNN)strategy and demonstrate its capability for port-controllable OAM mode *** leveraging the correlation between the orthogonal evolution of OAM modes in free space and phase modulations during propagation,the R-DNN precisely shapes the spatial evolution of mode fields through multiple rotatable phase layers,enabling efficient routing to specific output *** approach exploits the interaction of secondary wavelets with the relative states of the rotatable layers,allowing on-demand control of mode evolution paths and enhancing routing *** a proof of concept,we developed a tri-functional router that successfully directs three OAM modes to individually controllable output *** router achieves an average intermode crosstalk of less than−16.4 dB across three functional states,one-dimensional,two-dimensional,and cross-connected switching,while supporting the routing of 5.85 Tbit/s quadrature phase-shift keying *** results highlight the R-DNN’s effectiveness in achieving precise and controllable OAM mode manipulation,paving the way for advanced applications in mode-multiplexed communication networks and beyond.

关键词： orbital angular momentum mode mode routing diffractive neural network

来源：评论

学校读者我要写书评

暂无评论

Fabric Defect Detection system using YOLO

Fabric Defect Detection System using YOLO

引用

IIAI International Conference on advanced Applied Informatics (IIAIAAI)

作者： Masashi Kawaguchi Yuta Morimitsu Ryusei Watanabe Chihiro Ikuta Naohiro Ishii Masayoshi Umeno Department of Electrical & Electronic Engineering Suzuka College National Institute of Technology Suzuka Japan Information Systems Architecture Course Advanced Institute of Industrial Technology Tokyo Japan Department of Electronic Engineering Chubu University Kasugai Japan

In textile processing companies, after purchasing fabric, dyeing, and other treatments, such as surface finishing are carried out before shipping. Defect detection technology is one of the most important issues in this field. Because if we ship a defective fabric without noticing the defect, it will cause damage to the delivery destination. Previously, defect detection of fabric has been performed using methods such as CNN. However, conventional methods such as general multilayer neural networks require two separate processing stages: object detection and identification. Therefore, there is a problem that sufficient real-time performance cannot be guaranteed in the inspection process on an actual manufacturing line. Therefore, in this study, we construct a fabric defect detection system using YOLO which is capable of real-time object detection. In the future, we aim to realize the automation of textile defect detection systems by the construction of an image recognition system using machine learning. It is expected that this will result from reduced detection errors by the human eye, improve detection accuracy, and reduce labor costs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Development of separation technology for dissimilar material bonding products of steel plate and CFRTP using the eddy current method 7

Development of separation technology for dissimilar material...

引用

7th International Conference on Intelligent Informatics and Biomedical Sciences, ICIIBMS 2022

作者： Itaya, Toshiya Ito, Junya Maekawa, Masato Yoshioka, Saijiro National Institute of Technology Suzuka College Department of Electronic and Information Engineering Mie Suzuka Japan National Institute of Technology Suzuka College Advanced Engineering Course of Science and Technology for Innovation Mie Suzuka Japan National Institute of Technology Toba College Department of Informatics and Mechanical Engineering Mie Toba Japan

ISBN: (数字)9781665482295

ISBN: (纸本)9781665482295

Owing to their lightweight and high specific strength, carbon fiber reinforced plastics (CFRTPs) are now receiving widespread applications in the transportation and energy industries. In this regard, developing technology for separating and extracting CFRTP from dissimilar material bonding products of metal and CFRTP has become a research hotspot. Therefore, in this study, we developed a separation technology for dissimilar material bonding products of steel sheet and CFRTP using the eddy current method. As a result, we succeeded in separating dissimilar materials using a fabricated induction heating system. In addition, atomic force microscope (AFM) analysis of CFRTP was conducted to confirm the change in physical properties before and after heating. © 2022 IEEE.

关键词： Induction heating

来源：评论

学校读者我要写书评

暂无评论

A Two-Stage Interleaved Bridgeless SEPIC based PFC Converter for Electric Vehicle Charging Application 9

A Two-Stage Interleaved Bridgeless SEPIC based PFC Converter...

引用

9th IEEE International Conference on Communications and electronics, ICCE 2022

作者： Luckose, Vinukumar Kannan, Ramani Hasan, Khairul Nisak Md Ibrahim, Taib B SEGi University Center for Advanced Electrical and Electronic System Faculty of Engineering Built Environment and Information Technology Petaling Jaya Malaysia Universiti Teknologi Petronas Power Control and Instrumetnation Cluster Department of Electrical and Electronics Engineering Perak Seri Iskandar Malaysia

ISBN: (数字)9781665497459

ISBN: (纸本)9781665497442

Electric vehicles are become more popular nowadays due to negligible gas emissions and less dependent on fossil fuel. However, the battery charging process is the main challenge that influences the electric vehicle (EV) transportation system. The power factor correction (PFC) and dc-dc converter stages are the main phases in the EV charging system. Various electric vehicle charging technologies are developed using different power electronics converter topologies, such as cuck, Zeta, SEPIC, and buck-boost converter. SEPIC (Single Ended Primary Inductor Converter) converter topology is the most preferred topology for battery charging applications due to providing non-inverting output with buck boost operation and reduced input and output ripple current. Although the SEPIC convertor topology has many advantages still possess a lot of challenges. The main challenges are reducing the converter size, conduction loss, voltage stress and increasing the efficiency when compared with the existing recent developed Bridgeless SEPIC topologies with interleaved concept. In this proposed research, a modified interleaved bridgeless, SEPIC based converter is proposed to improve the Power Quality (PQ) for vehicle charging station. The proposed topology is able to reduce the voltage stress, power loss, increase the converter efficiency and improve the power factor due to the bridgeless with interleaved configuration compared to other topologies. The preliminary design of the of the bridgeless interleaved topology is developed with the help of MATLAB Simulink software. The various preliminary results were obtained at the input supply voltage of 70-230 V ac supply. © 2022 IEEE.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Dual-point noncoaxial rotational Doppler effect towards synthetic OAM light fields for real-time rotating axis detection

引用

Light(advanced Manufacturing) 2023年第4期4卷 10-20页

作者： Yanxiang Zhang Zijing Zhang Han Lin Zhongquan Nie Rui Feng Yuan Zhao Baohua Jia School of Physics Harbin Institute of TechnologyHarbin 150001China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Electronic Information and Optical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Centre for Atomaterials and Nanomanufacturing(CAN) School of ScienceRMIT UniversityMelbourne3000 VICAustralia

Probing the axis of a rotator is important in astrophysics,aerospace,manufacturing,machinery,automation,and virtual reality,*** optical solutions commonly require multiple sequential measurements via symmetry-broken light fields,which make them time-consuming,inefficient,and prone to accumulated ***,we propose the concept of a dual-point noncoaxial rotational Doppler effect(DNRDE)and demonstrate a one-shot detection technique to solve this *** on-demand synthetic orbital angular momentum(OAM)light beam impinges on a rotating scatterer surface,supporting dual-point rotational Doppler shifts,in which the information of the rotating axis is acquired by comparing these two frequency shifts with a prescribed *** existence of arbitrary dual-point Doppler shifts enables the one-time direct identification of rotating axis orientations,which is fundamentally inaccessible in single-point *** robust detection technique is compatible with generalised synthetic OAM light fields by utilising optical modal *** with traditional approaches,our DNRDE-driven detection approach exhibits a four-fold enhancement in measurement speed,higher energy efficiency,and superior accuracy with a maximal absolute measurement error of 2.23°.The proposed dual-point detection method holds great promise for detecting rotating bodies in various applications,such as astronomical surveys and industrial manufacturing.

关键词： Rotational Doppler effect Rotating axis orientations Real-time detection Orbital angular momentum Optical vortices

来源：评论

学校读者我要写书评

暂无评论

Achieving high-security and massive-capacity optical communications based on orbital angular momentum configured chaotic laser

引用

advanced Photonics Nexus 2024年第4期3卷 92-100页

作者： Yanwei Cui Jianguo Zhang Zhongquan Nie Anbang Wang Yuncai Wang Taiyuan University of Technology Ministry of EducationCollege of Electronic Information and Optical EngineeringKey Laboratory of Advanced Transducers and Intelligent Control SystemTaiyuanChina National University of Defense Technology College of Advanced Interdisciplinary StudiesChangshaChina Guangdong University of Technology School of Information EngineeringGuangzhouChina Guangdong Provincial Key Laboratory of Photonics Information Technology GuangzhouChina

Secure and high-speed optical communications are of primary focus in information *** it is widely accepted that chaotic secure communication can provide superior physical layer security,it is challenging to meet the demand for high-speed increasing communication *** theoretically propose and experimentally demonstrate a conceptual paradigm for orbital angular momentum(OAM)configured chaotic laser(OAM-CCL)that allows access to high-security and massivecapacity optical *** 11 OAM modes and an all-optical feedback chaotic laser,we are able to theoretically empower a well-defined optical communication system with a total transmission capacity of 100 Gb∕s and a bit error rate below the forward error correction threshold 3.8×10^(-3).Furthermore,the OAM-CCL-based communication system is robust to 3D misalignment by resorting to appropriate mode spacing and beam ***,the conceptual paradigm of the OAM-CCL-based communication system is *** contrast to existing systems(traditional free-space optical communication or chaotic optical communication),the OAM-CCL-based communication system has threein-one characteristics of high security,massive capacity,and *** findings demonstrate that this will promote the applicable settings of chaotic laser and provide an alternative promising route to guide high-security and massive-capacity optical communications.

关键词： chaotic secure communication orbital angular momentum configured chaotic laser high security massive capacity misalignment

来源：评论

学校读者我要写书评

暂无评论

Dual-band Artificial Magnetic Conductor for Wi-Fi Antenna

Dual-band Artificial Magnetic Conductor for Wi-Fi Antenna

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Zhou, Junyu Zhang, Yanwen Dong, Xiahua Huang, Jiahao Liu, Qingchong Jin, Yizhou Liu, Hui Zhejiang University Center for Optical and Electromagnetic Research National Engineering Research Center for Optical Instruments Hangzhou310058 China Guangdong Polytechnical Normal University School of Electronic and Information Guangzhou510665 China South China Normal University Rf Circuit & Microwave System Lab Centre for Optical and Electromagnetic Research Academy of Advanced Optoelectronics Guangzhou510006 China

ISBN: (纸本)9798350375909

This paper presents a dual-band Artificial Magnetic Conductor (AMC) for Wi-Fi antenna operating at 2.4 GHz and 5.8 GHz. The proposed AMC reflector is substituted for traditional PEC reflector to achieve a low-profile antenna configuration. The proposed AMC demonstrates dual-band in-phase reflection in the 2.32-2.48 GHz and 5.49-6.09 GHz bands, effectively covering the Wi-Fi application bands. The distance between WiFi antenna and the AMC reflector can be decreased from 0.25λ to 0.125λ (λ is free-space wavelength at 5.8 GHz). Simulated results show that the |S11| © 2024 IEEE.

关键词： Wi-Fi

来源：评论

学校读者我要写书评

暂无评论

Design of a Polygon AMC Reflector for Dual-band Dual-polarized 5G Antenna

Design of a Polygon AMC Reflector for Dual-band Dual-polariz...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Zeng, Weiliang Huang, Jiahao Dong, Xiahua Zhang, Yanwen Zhou, Junyu Liu, Qingchong Liu, Hui Zhejiang University Center for Optical and Electromagnetic Research National Engineering Research Center for Optical Instruments Hangzhou310058 China Guangdong Polytechnical Normal University School of Electronic and Information Guangzhou510665 China South China Normal University Rf Circuit and Microwave System Lab Centre for Optical and Electromagnetic Research Academy of Advanced Optoelectronics Guangzhou510006 China

ISBN: (纸本)9798350375909

A novel polygonal artificial magnetic conductor (AMC) reflector for dual-band dual-polarized 5G base station antenna is proposed. The antenna consists of a pair of square symmetric dipole patches and an AMC reflector. The dipoles are placed in a cross pattern to achieve ±45 polarization. Two perpendicularity slotted dipoles are used to realize the dual-band characteristic. By using the proposed AMC reflector, antenna height can be reduced from 0.25λ0 to 0.058λ0 without degrading its performance (λ0 represents the free space wavelength at 3.45 GHz).Simulation results indicate that the operating frequency range with S11 better than 10 dB is 3.41-3.61 GHz and 4.63-4.91 GHz, with isolation better than 31 dB, and a maximum gain about 7.5 dBi. © 2024 IEEE.

关键词： Reflection

来源：评论

学校读者我要写书评

暂无评论

An Evaluation of Channel Estimation Method Using Deep Learning for OFDM system

An Evaluation of Channel Estimation Method Using Deep Learni...

引用

International Conference on Ubiquitous and Future Networks, ICUFN

作者： Ryo Onishi Tadatomo Sato Teruji Ide Advanced Electrical and Information Systems Engineering Course (leading to Bachelor of Engineering) National Institute of Technology Kagoshima College Kirishima-shi Kagoshima Japan Dept. of Electrical and Electronic Engineering National Institute of Technology Kagoshima College Kirishima-shi Kagoshima Japan

ISBN: (数字)9798350385298

ISBN: (纸本)9798350385304

In the time- and frequency-variant mobile radio channel such as the Fifth- and Forth-Generation mobile communications systems (5G, 4G), it is very important to estimate the channel coefficients (gains). We propose an estimation method of channel coefficients using a deep learning. The high accuracy of estimation can be evaluated using the deep learning method for super-resolution (SR) Network compared with the conventional method. The estimation of channel gains using orthogonal frequency-division multiplexing (OFDM) can be replaced with the SR problem and applied to the SR Network method. We show that the accuracy of the proposed method is higher than the conventional methods.

关键词： Deep learning Time-frequency analysis Accuracy OFDM Superresolution Channel estimation Estimation

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：