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On-chip metamaterial-enabled high-order mode-division multiplexing

Advanced Photonics 2023年第5期5卷 106-113页

作者： Yu He Xingfeng Li Yong Zhang Shaohua An Hongwei Wang Zhen Wang Haoshuo Chen Yetian Huang Hanzi Huang Nicolas KFontaine Roland Ryf Yuhan Du Lu Sun Xingchen Ji Xuhan Guo Yingxiong Song Qianwu Zhang Yikai Su Shanghai Jiao Tong University Department of Electronic EngineeringState Key Laboratory of Advanced Optical Communication Systems and NetworksShanghaiChina Nokia Bell Labs Murray HillNew JerseyUnited States Shanghai University Key Laboratory of Specialty Fiber Optics and Optical Access NetworksJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghaiChina Shanghai Jiao Tong University School of Electronic Information and Electrical EngineeringJohn Hopcroft Center for Computer ScienceShanghaiChina

Mode-division multiplexing(MDM)technology enables high-bandwidth data transmission using orthogonal waveguide modes to construct parallel data ***,few demonstrations have been realized for generating and supporting high-order modes,mainly due to the intrinsic large material groupvelocity dispersion(GVD),which make it challenging to selectively couple different-order spatial *** show the feasibility of on-chip GVD engineering by introducing a gradient-index metamaterial structure,which enables a robust and fully scalable MDM *** demonstrate a record-high-order MDM device that supports TE_(0)–TE_(15)modes simultaneously.40-GBaud 16-ary quadrature amplitude modulation signals encoded on 16 mode channels contribute to a 2.162 Tbit∕s net data rate,which is the highest data rate ever reported for an on-chip single-wavelength *** method can effectively expand the number of channels provided by MDM technology and promote the emerging research fields with great demand for parallelism,such as high-capacity optical interconnects,high-dimensional quantum communications,and large-scale neural networks.

关键词： integrated photonics metamaterial mode-division multiplexing subwavelength grating

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On the design and fabrication of nanoliter-volume hanging drop networks

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Microsystems & Nanoengineering 2024年第5期10卷 435-447页

作者： Matthew Wester Jongwon Lim Liliana Khaertdinova Sriya Darsi Neel Donthamsetti Glennys Mensing George Vasmatzis Panos Anastasiadis Enrique Valera Rashid Bashir Department of Bioengineering University of linois Urbana-ChampaignUrbanaIL 61801USA Nick Holonyak Jr.Micro and Nanotechnology Laboratory University of Ilinois Urbana-ChampaignUrbanaIL 61801USA Center for Individualized Medicine Mayo ClinicRochesterMN 55905USA Mayo-Illinois Alliance for Technology-Based Healthcare UrbanaIL 61801USA Department of Cancer Biology Mayo ClinicJacksonvilleFL 32224USA Carl R.Woese Institute for Genomic Biology University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Biomedical Research Center Carle Foundation HospitalUrbanaIL 61801USA Cancer Center at Illinois University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Biomedical and Translation Science Carle Illinois College of MedicineUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA Chan Zuckerberg Biohub Chicago ChicagoIL 60642USA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

Hanging drop cultures provide a favorable environment for the gentle,gel-free formation of highly uniform three-dimensional cell cultures often used in drug screening *** cell numbers can be limited,as with primary cells provided by minimally invasive ***,it can be beneficial to divide cells into miniaturized arrays of hanging drops to supply a larger number of ***,we present a framework for the miniaturization of hanging drop networks to nanoliter *** principles of a single hanging drop are described and used to construct the fundamental equations for a microfluidic system composed of multiple connected *** equations for the hanging drop as a nonlinear capacitive element are derived for application in the electronic-hydraulic analogy,forming the basis for more complex,time-dependent numerical modeling of hanging drop *** is supplemented by traditional computational fluid dynamics simulation to provide further information about flow conditions within the wells.A fabrication protocol is presented and demonstrated for creating transparent,microscale arrays of pinned hanging drops.A custom interface,pressure-based fluidic system,and environmental chamber have been developed to support the ***,fluid flow on the chip is demonstrated to align with expected behavior based on the principles derived for hanging drop *** with the system and potential areas for improvement are *** paper expands on the limited body of hanging drop network literature and provides a framework for designing,fabricating,and operating these systems at the microscale.

关键词： networks system hanging

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Laser Development for the Sodium Lidar for the TOMEX-Plus Rocket Experiment

Laser Development for the Sodium Lidar for the TOMEX-Plus Ro...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Michael A. Gachich Michael A. Rizk Alexander R. Pietros Coggan E. Banerian James H. Clemmons Gary R. Swenson Peter D. Dragic Fiber Optics Research and Glass Engineering (FORGE) Laboratory and the Holonyak Micro and Nanotechnology Laboratory Urbana Illinois USA Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana Illinois USA Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign Urbana Illinois USA Department of Physics and Astronomy University of New Hampshire Durham New Hampshire USA

Progress towards the development of a 589 nm laser for a sodium lidar for the TOMEX-Plus rocket campaign is presented. The laser is a Raman amplified (1178 nm) and frequency doubled MOPA configuration.

ISBN: (纸本)9798350369311

关键词： Rockets Laser radar Stimulated emission Sodium Lasers and electrooptics Electro-optical waveguides

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Guest editorial: Progress on computational techniques for electromagnetic fields and applications

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COMPEL - The International Journal for Computation and Mathematics in electrical and Electronic engineering 2023年第1期42卷 1-1页

作者： Yang, Shiyou Sykulski, Jan Qingxin, Yang Cui, Xiang Department of Electrical Engineering Zhejiang University Hangzhou China Department of Electronics and Computer Science Southampton University Southampton United Kingdom Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin China State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources Research Center for Electromagnetism and Superconduction Beijing China

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Implications of the electron-phonon coupling in CuPb9(PO4)6O for superconductivity: An ab initio study

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Physical Review Materials 2024年第1期8卷 L011801-L011801页

作者： Hari Paudyal Michael E. Flatté Durga Paudyal Department of Physics and Astronomy University of Iowa Iowa City Iowa 52242 USA Ames National Laboratory of the US DOE Iowa State University Ames Iowa 50011 USA Department of Applied Physics Eindhoven University of Technology Eindhoven 5612 AZ The Netherlands Department of Electrical and Computer Engineering Iowa State University Ames Iowa 50011 USA

We report ab initio calculations of the electronic and vibrational properties in CuPb9(PO4)6O, including the electron-phonon coupling strength via strong-coupling Migdal-Eliashberg theory. We verify the presence of appealing flat electronic bands near the Fermi level, a strong hybridization between the Cu 3d and O 2p states, and soft low-energy phonons, which can suggest high-temperature superconducting behavior. However, the electron-phonon coupling strength appears insufficient to overcome the Coulomb repulsion between an electron pair and thus does not support high-temperature superconductivity in CuPb9(PO4)6O via the conventional electron-phonon Migdal-Eliashberg mechanism. Even neglecting Coulomb repulsion of the electron pair we find this electron-phonon coupling suggests a superconducting transition temperature of less than 2 K.

关键词： Electron-phonon coupling Electronic structure Phonons Superconductivity Density functional theory Eliashberg theory

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Disturbance Rejection Control for Autonomous Trolley Collection Robots with Prescribed Performance

arXiv

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arXiv 2023年

作者： Xi, Rui-Dong Lu, Liang Zhang, Xue Xiao, Xiao Xia, Bingyi Wang, Jiankun Meng, Max Q.-H. Shenzhen Key Laboratory of Robotics Perception and Intelligence the Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen518055 China Jiaxing Research Institute Southern University of Science and Technology Jiaxing China Yuanhua Robotics Perception & AI Technologies Ltd Shenzhen518055 China

Trajectory tracking control of autonomous trolley collection robots (ATCR) is an ambitious work due to the complex environment, serious noise and external disturbances. This work investigates a control scheme for ATCR subjecting to severe environmental interference. A kinematics model based adaptive sliding mode disturbance observer with fast convergence is first proposed to estimate the lumped disturbances. On this basis, a robust controller with prescribed performance is proposed using a backstepping technique, which improves the transient performance and guarantees fast convergence. Simulation outcomes have been provided to illustrate the effectiveness of the proposed control scheme. Copyright © 2023, The Authors. All rights reserved.

关键词： Skids

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FAIR-FATE: Fair Federated Learning with Momentum

arXiv

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arXiv 2022年

作者： Salazar, Teresa Fernandes, Miguel Araújo, Helder Abreu, Pedro Henriques Centre for Informatics and Systems Department of Informatics Engineering of The University of Coimbra University of Coimbra Coimbra Portugal Institute of Systems and Robotics Department of Electrical and Computer Engineering of The University of Coimbra University of Coimbra Coimbra Portugal

While fairness-aware machine learning algorithms have been receiving increasing attention, the focus has been on centralized machine learning, leaving decentralized methods underexplored. Federated Learning is a decentralized form of machine learning where clients train local models with a server aggregating them to obtain a shared global model. Data heterogeneity amongst clients is a common characteristic of Federated Learning, which may induce or exacerbate discrimination of unprivileged groups defined by sensitive attributes such as race or gender. In this work we propose FAIR-FATE: a novel FAIR FederATEd Learning algorithm that aims to achieve group fairness while maintaining high utility via a fairness-aware aggregation method that computes the global model by taking into account the fairness of the clients. To achieve that, the global model update is computed by estimating a fair model update using a Momentum term that helps to overcome the oscillations of non-fair gradients. To the best of our knowledge, this is the first approach in machine learning that aims to achieve fairness using a fair Momentum estimate. Experimental results on real-world datasets demonstrate that FAIR-FATE outperforms state-of-the-art fair Federated Learning algorithms under different levels of data *** Codes 68T07 © 2022, CC BY.

关键词： Momentum

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Solar Image Cloud Removal based on Improved Pix2Pix Network

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computers, Materials & Continua 2022年第12期73卷 6181-6193页

作者： Xukun Zhang Wei Song Ganghua Lin Yuxi Shi School of Information Engineering Minzu University of ChinaBeijing100081China Key Laboratory of Solar Activity Chinese Academy of Sciences(KLSACAS)Beijing100101China National Language Resource Monitoring and Research Center of Minority Languages Minzu University of ChinaBeijing100081China National Astronomical Observatories Chinese Academy of Sciences(NAOCCAS)Beijing100101China Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNew Jersey07102USA

In ground-based observations of the Sun,solar images are often affected by appearance of thin clouds,which contaminate the images and affect the scientific results from data *** this paper,the improved Pixel to Pixel Network(Pix2Pix)network is used to convert polluted images to clear images to remove the cloud shadow in the solar *** adding attention module to the model,the hidden layer of Pix2Pix model can infer the attention map of the input feature vector according to the input feature *** then,the attention map is multiplied by the input feature map to give different weights to the hidden features in the feature map,adaptively refine the input feature map to make the model pay attention to important feature information and achieve better recovery *** order to further enhance the model’s ability to recover detailed features,perceptual loss is added to the loss *** model was tested on the full disk H-alpha images datasets provided by Huairou Solar Observing Station,National Astronomical *** experimental results show that the model can effectively remove the influence of thin clouds on the picture and restore the details of solar *** peak signal-to-noise ratio(PSNR)reaches 27.3012 and the learned perceptual image patch similarity(LPIPS)reaches 0.330,which is superior to the existed dehaze algorithms.

关键词： Pix2Pix decontamination full-disk H-alpha images

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Joint Resource Allocation and Data Offloading for Closed-Loop Controls in Satellite-UAV Networks

Joint Resource Allocation and Data Offloading for Closed-Loo...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Chengleyang Lei Wei Feng Peng Wei Yunfei Chen Ning Ge Shiwen Mao Department of Electronic Engineering Tsinghua University Beijing China State Key Laboratory of Space Network and Communications Tsinghua University Beijing China National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China Chengdu China Department of Engineering University of Durham Durham U.K Department of Electrical and Computer Engineering Auburn University Auburn AL USA

ISBN: (数字)9798350390643

ISBN: (纸本)9798350390650

To efficiently provide coverage for the machines and robots in remote areas, satellites and unmanned aerial vehicles (UAVs) can be utilized. In such scenarios, UAVs need to integrate different functions to support the control tasks of robots efficiently, while satellites can serve as backhaul to the cloud. To improve the overall performance of the closed-loop control tasks of robots, we jointly optimize the communication and computing resource allocation with data offloading. Specif-ically, we explore the linear quadratic regulator (LQR) cost to measure the control performance and formulate a sum LQR cost minimization problem. An iterative algorithm is proposed to solve the optimization problem. Simulation results are provided to demonstrate the superiority of the proposed scheme.

关键词： Wireless communication Costs Satellites Regulators Simulation Minimization Autonomous aerial vehicles Resource management Iterative methods Robots

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CDM-MPC: An Integrated Dynamic Planning and Control Framework for Bipedal Robots Jumping

arXiv

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arXiv 2024年

作者： He, Zhicheng Wu, Jiayang Zhang, Jingwen Zhang, Shibowen Shi, Yapeng Liu, Hangxin Sun, Lining Su, Yao Leng, Xiaokun Department of Computer Science Harbin Institute of Technology Harbin150001 China Beijing100080 China School of Mechatronics Engineering Harbin Institute of Technology Harbin150080 China Jiangsu Provincial Key Laboratory of Advanced Robotics School of Mechanical and Electric Engineering Soochow University Suzhou215000 China

Performing acrobatic maneuvers like dynamic jumping in bipedal robots presents significant challenges in terms of actuation, motion planning, and control. Traditional approaches to these tasks often simplify dynamics to enhance computational efficiency, potentially overlooking critical factors such as the control of centroidal angular momentum (CAM) and the variability of centroidal composite rigid body inertia (CCRBI). This paper introduces a novel integrated dynamic planning and control framework, termed centroidal dynamics model-based model predictive control (CDM-MPC), designed for robust jumping control that fully considers centroidal momentum and non-constant CCRBI. The framework comprises an optimization-based kinodynamic motion planner and an MPC controller for real-time trajectory tracking and replanning. Additionally, a centroidal momentum-based inverse kinematics (IK) solver and a landing heuristic controller are developed to ensure stability during high-impact landings. The efficacy of the CDM-MPC framework is validated through extensive testing on the full-sized humanoid robot KUAVO in both simulations and experiments. Copyright © 2024, The Authors. All rights reserved.

关键词： Model predictive control

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