检索结果-内蒙古大学图书馆

A perspective of twisted photonic structures

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Chen, Jialin Lin, Xiao Chen, Mingyuan Low, Tony Chen, Hongsheng Dai, Siyuan Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou310027 China International Joint Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy at Zhejiang University Zhejiang University Haining314400 China Materials Research and Education Center Department of Mechanical Engineering Auburn University AuburnAL36849 United States Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States

Moiré superlattices-twisted van der Waals (vdW) structures with small angles-are attracting increasing attention in condensed matter physics, due to important phenomena revealed therein, including unconventional superconductivity, correlated insulating states, and ferromagnetism. Moiré superlattices are typically comprised of atomic layers of vdW materials where the exotic physics arises from the quantum electronic coupling between adjacent atomic layers. Recently, moiré electronics has motivated their photonic counterparts. In addition to vdW materials, twisted photonic systems can also be comprised of metamaterials, metasurfaces, and photonic crystals, mediated by interlayer electromagnetic coupling instead. The interplay between short-ranged interlayer quantum and long-ranged electromagnetic coupling in twisted structures are expected to yield rich phenomena in nano-optics. This perspective reviews recent progress in twisted structures for nanophotonics and outlooks emerging topics, opportunities, fundamental challenges, and potential applications. © 2021, CC BY.

关键词： Van der Waals forces

SWOT analysis on the transition from Lithium-Ion batteries to Sodium-Ion batteries

学校读者我要写书评

暂无评论

Sustainable Energy Technologies and Assessments 2025年 80卷

作者： Ebrahim Pilali Faraz Forutan Nia Eliyad Yamini Farbod Esmaeilion Walied Alfraidi Alireza Taklifi Davide Astiaso Garcia M. Soltani Department of Mechanical Engineering K.N. Toosi University of Technology Tehran 19967-15433 Iran Faculty of Mechanical Engineering Arak University of Technology Arak Iran Department of Electrical Engineering College of Engineering Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh 11564 Saudi Arabia Center of Excellence in Design and Optimization of Energy Systems School of Mechanical Engineering College of Engineering University of Tehran Tehran Iran Advanced Energy Initiative Center K.N. Toosi University of Technology Tehran 14176-14411 Iran Department of Planning Design Technology of Architecture Sapienza University of Rome Via Flaminia 72 00196 Rome Italy Waterloo Institute for Sustainable Energy (WISE) University of Waterloo Waterloo ON N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ON N2L 3G1 Canada Centre for Sustainable Business International Business University Toronto Canada Balsillie School Fellow at the Balsillie School of International Affairs (BSIA) Waterloo ON Canada

The natural and atmospheric circumstances regarding energy resources are experiencing a transformation at the global level due to the exhaustion of the supply of conventional energy resources and climate change. With regards to energy storage systems, lithium-ion batteries (LIBs) have remained the most popular energy storage system technologies because of their high energy density, longer cycle life, and reliability. Nonetheless, the costs and scarcity of lithium as a raw material for REs are unreasonable in the long term. But, new chairs such as sodium-ion batteries (SIBs) are seeing potential benefits over traditional batteries including the availability of Sodium, cost of raw materials, and eco-friendliness. However, there are concerns with SIBs about their less energy density in comparison with LIBs, which needs the invention of expertise. This paper seeks to establish the feasibility of SIBs by analyzing their strengths and weaknesses, opportunities, and threats. Major and minor drawbacks presented in any SIB system are discussed regarding cost performance, safer operation, and environmental gains related to drawbacks such as energy density and cycles per life. Also, important dilemmas regarding LIBs presented in the literature including high efficiency, high power density, and environmentally sound recycling methods are discussed. This study underscores how different conditions may boost SIB performance, commercial feasibility and need for further technical efforts to eliminate existing obstacles so that SIBs can be effectively applied to smarter grids and other renewable energy systems.

关键词： Sodium-ion Battery Lithium-ion Battery SWOT analysis Battery recycling

Development of Virtual Learning Factory Toolkit for Production engineering Education

学校读者我要写书评

暂无评论

IOP Conference Series: Materials Science and engineering 2021年第1期1140卷

作者： Kashif Mahmood Tauno Otto Vladimir Kuts Walter Terkaj Marcello Urgo Geza Haidegger Department of Mechanical and Industrial Engineering Tallinn University of Technology Tallinn Estonia STIIMA-CNR Institute of Intelligent Industrial Technologies and Systems for Advanced Manufacturing National Research Council Milan Italy Manufacturing and Production Systems Division Department of Mechanical Engineering Politecnico di Milano Milan Italy SZTAKI – Institute for Computer Science and Control Budapest Hungary

The advent of industry 4.0 and the continuous digitalization of production ask for the enhancement of human skills and competences in the field of information and communication technology (ICT). Therefore, higher education has to keep pace with the global market needs for the necessary ICT skills and the overall understanding of the complexity of industries in 21st century. This paper focuses on the development and integration of Virtual Learning Factory (VLF) tools that can be used in production management and engineering education. The digital tools integrated in VLF toolkit can help students to exploit enabling technologies like simulation and virtual reality in their manufacturing studies and practical projects with industrial companies.

关键词：

Cascade Terminal Sliding Mode Control of a Deployable Cable Driven Robot

学校读者我要写书评

暂无评论

Cascade Terminal Sliding Mode Control of a Deployable Cable ...

International Conference on Control, Instrumentation, and Automation

作者： S. A. Khalilpour R. Khorrambakht M. J. Harandi H. D. Taghirad Philippe Cardou Advanced Robotics and Automated Systems Faculty of Electrical and Computer Engineering K.N. Toosi University of Technology Tehran Iran Department of Mechanical Engineering Robotics Laboratory Laval University Quebec City QC Canada

ISBN: (数字)9781728158150

ISBN: (纸本)9781728158167

Most control systems used for cable-driven parallel manipulators employ a simple inner control loop for controlling the driving force of the actuators. By this means the effects of some nonlinear uncertainties of the actuator and power transmission systems are significantly reduced, and in turn, this helps the outer user-specified position control loop to perform more accurately. However, this positive impact on performance relies on non achievable assumptions that the inner control loop is fast and accurate enough, and its dynamics can be totally ignored. The main contribution of this paper is to analyze the stability of the system as a whole, considering both inner and outer loop controllers. The outer loop controller proposed in here is a finite time robust sliding mode whose stability is analyzed through the Lyapunov direct method. A deployable cable-driven parallel robot, as the case study, is also considered in this paper, which is characterized by several intrinsic kinematic and dynamic uncertainties. Finally, the performance and effectiveness of the proposed robust controller is evaluated through some simulations and experiments in order to verify the effectiveness and the characteristics of the cascade controller structure in practice.

关键词： Robots Mathematical model Actuators Jacobian matrices Force Uncertainty Kinematics

High-density implantable neural electrodes and chips for massive neural recordings

学校读者我要写书评

暂无评论

Brain‐X

Brain‐X 2024年第2期2卷

作者： Longchun Wang Yanxing Suo Jiahao Wang Xuanqi Wang Kai Xue Jingjing An Xun Sun Qinyu Chen Xiaochen Tang Yang Zhao Bowen Ji Jingquan Liu Department of Micro/Nano Electronics Shanghai Jiao Tong University Shanghai China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Shanghai Jiao Tong University Shanghai China DCI Joint Team Collaborative Innovation Center of IFSA Shanghai Jiao Tong University Shanghai China Unmanned System Research Institute Northwestern Polytechnical University Xi'an Shaanxi China National Key Laboratory of Unmanned Aerial Vehicle Technology Xi'an Shaanxi China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical Engineering Northwestern Polytechnical University Xi'an Shaanxi China Institute of Guizhou Aerospace Measuring and Testing Technology Guiyang Guizhou China Leiden Institute of Advanced Computer Science (LIACS) Leiden University Leiden The Netherlands Klipsch School of Electrical and Computer Engineering New Mexico State University Las Cruces New Mexico USA Yang Zhao Bowen Ji and Jingquan Liu.

High-density neural recordings with superior spatiotemporal resolution powerfully unveil cellular-scale neural communication, showing great promise in neural science, translational medicine, and clinical applications. To achieve such, many design and fabrication innovations enhanced the electrode, chip, or both for biocompatibility improvement, electrical performance upgrade, and size miniaturization, offering several thousands of recording sites. However, an enormous gap exists along the trajectory toward billions of recording sites for brain scale resolution, posing many more design challenges. This review tries to find possible insight into mitigating the gap by discussing the latest progress in high-density electrodes and chips for neural recordings. It emphasizes the design, fabrication, bonding techniques, and in vivo performance optimization of high-density electrodes. It discusses the promising opportunities for circuit-level and architecture-level multi-channel chip design innovations. We expect that joint effort and close collaboration between high-density electrodes and chips will pave the way to high-resolution neural recording tools supporting cutting-edge neuroscience discoveries and applications.

关键词： brain-computer interface massive neural recording high density implantable electrodes implantable chips

The 2024 Active Metamaterials Roadmap

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Pope, Simon A. Roth, Diane J. Bansal, Aakash Mousa, Mostafa Rezanejad, Ashkan Forte, Antonio E. Nash, Geoff.R. Singleton, Lawrence Langfeldt, Felix Cheer, Jordan Henthorn, Stephen Hooper, Ian R. Hendry, Euan Powell, Alex W. Souslov, Anton Plum, Eric Sun, Kai de Groot, C.H. Muskens, Otto L. Shields, Joe De Galarreta, Carlota Ruiz Wright, C. David Kocabas, Coskun Ergoktas, M. Said Xiao, Jianling Schulz, Sebastian A. Di Falco, Andrea Krasavin, Alexey V. Zayats, Anatoly V. Galiffi, Emanuele Department of Automatic Control and Systems Engineering The University of Sheffield Amy Johnson Building Portobello Street SheffieldS1 3JD United Kingdom Department of Physics London Centre for Nanotechnology King’s College London Strand WC2R 2LS United Kingdom Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough University United Kingdom Department of Engineering King’s College London LondonWC2R 2LS United Kingdom Natural Sciences University of Exeter Harrison Building North Park Road Exeter United Kingdom Institute of Sound & Vibration Research University of Southampton University Road Southampton United Kingdom Department of Electronic and Electrical Engineering University of Sheffield Sheffield United Kingdom Centre for Metamaterial Research and Innovation University of Exeter Stoker Road ExeterEX4 4QL United Kingdom T.C.M. Group Cavendish Laboratory University of Cambridge CambridgeCB3 0HE United Kingdom Optoelectronics Research Centre Centre for Photonic Metamaterials University of Southampton Highfield SouthamptonSO17 1BJ United Kingdom School of Physics and Astronomy University of Southampton Southampton United Kingdom Electronics and Computer Science University of Southampton Southampton United Kingdom Institute of Materials Science of Barcelona Universitat Autònoma de Barcelona Bellaterra Barcelona08193 Spain Department of Materials National Graphene Institute University of Manchester United Kingdom Schoolof Physics and Astronomy University of St Andrews North Haugh Fife St. AndrewsKY16 9SS United Kingdom Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada Photonics Initiative Advanced Science Research Centre City University of New York 85 St. Nicholas Terrace New YorkNY10027 United States

Active metamaterials are engineered structures that possess novel properties that can be changed after the point of manufacture. Their novel properties arise predominantly from their physical structure, as opposed to their chemical composition and can be changed through means such as direct energy addition into wave paths, or physically changing/morphing the structure in response to both a user or environmental input. Active metamaterials are currently of wide interest to the physics community and encompass a range of sub-domains in applied physics (e.g. photonic, microwave, acoustic, mechanical, etc.). They possess the potential to provide solutions that are more suitable to specific applications, or which allow novel properties to be produced which cannot be achieved with passive metamaterials, such as time-varying or gain enhancement effects. They have the potential to help solve some of the important current and future problems faced by the advancement of modern society, such as achieving net-zero, sustainability, healthcare and equality goals. Despite their huge potential, the added complexity of their design and operation, compared to passive metamaterials creates challenges to the advancement of the field, particularly beyond theoretical and lab -based experiments. This roadmap brings together experts in all types of active metamaterials and across a wide range of areas of applied physics. The objective is to provide an overview of the current state of the art and the associated current/future challenges, with the hope that the required advances identified create a roadmap for the future advancement and application of this field. Copyright © 2024, The Authors. All rights reserved.

关键词： Microwave acoustics

Geometric Filterless Photodetectors for Mid-infrared Spin Light

学校读者我要写书评

暂无评论

arXiv 2022年

作者： Wei, Jingxuan Chen, Yang Li, Ying Li, Wei Xie, Junsheng Lee, Chengkuo Novoselov, Kostya S. Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei230026 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou310027 China International Joint Innovation Center Key Lab of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Haining314400 China GPL Photonics Lab State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Center for Intelligent Sensors and MEMS National University of Singapore Singapore117608 Singapore Institute for Functional Intelligent Materials National University of Singapore Singapore117544 Singapore

Free-space circularly polarized light (CPL) detection, requiring polarizers and waveplates, has been well established, while such spatial degree of freedom is unfortunately absent in integrated on-chip optoelectronics. So far, those reported filterless CPL photodetectors suffer from the intrinsic small discrimination ratio, vulnerability to the non-CPL field components, and low responsivity. Here, we report a distinct paradigm of geometric photodetectors in mid-infrared exhibiting colossal discrimination ratio, close-to-perfect CPL-specific response, a zero-bias responsivity of 392 V/W at room temperature, and a detectivity of ellipticity down to 0.03o Hz−1/2. Our approach employs plasmonic nanostructures array with judiciously designed symmetry, assisted by graphene ribbons to electrically read their near-field optical information. This geometry-empowered recipe for infrared photodetectors provides a robust, direct, strict, and high-quality solution to on-chip filterless CPL detection and unlocks new opportunities for integrated functional optoelectronic devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Photodetectors

Reciprocity of thermal diffusion in time-modulated systems

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Li, Jiaxin Li, Ying Cao, Pei-Chao Zheng, Xu Peng, Yu-Gui Li, Baowen Zhu, Xue-Feng Alù, Andrea Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China International Joint Innovation Center ZJU-UIUC Institute Electromagnetics Academy at Zhejiang University Zhejiang University Haining314400 China School of Physics and Innovation Institute Huazhong University of Science and Technology Wuhan430074 China Department of Physics University of Colorado BoulderCO80309 United States Department of Electrical Engineering City University of New York New YorkNY10031 United States Department of Mechanical Engineering University of Colorado BoulderCO80309 United States

The reciprocity principle governs the symmetry in transmission of electromagnetic and acoustic waves, as well as the diffusion of heat between two points in space, with important consequences for thermal management and energy harvesting. There has been significant recent interest in materials with time-modulated properties, which have been shown to efficiently break reciprocity for light, sound, and even charge diffusion. Quite surprisingly, here we show that, from a practical point of view, time modulation cannot generally be used to break reciprocity for thermal diffusion. We establish a theoretical framework to accurately describe the behavior of diffusive processes under time modulation, and prove that thermal reciprocity in dynamic materials is generally preserved by the continuity equation, unless some external bias or special material is considered. We then experimentally demonstrate reciprocal heat transfer in a time-modulated device. Our findings correct previous misconceptions regarding reciprocity breaking for thermal diffusion, revealing the generality of symmetry constraints in heat transfer, and clarifying its differences from other transport processes in what concerns the principles of reciprocity and microscopic reversibility. © 2021, CC BY.

关键词： Energy harvesting

A registration-aided domain adaptation network for 3D Point cloud based place recognition

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Qiao, Zhijian Hu, Hanjiang Shi, Weiang Chen, Siyuan Liu, Zhe Wang, Hesheng Department of Automation Insititue of Medical Robotics Key Laboratory of System Control and Information Processing of Ministry of Education Key Laboratory of Marine Intelligent Equipment and System of Ministry of Education Shanghai Jiao Tong University Shanghai200240 China Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of Technology China Department of Mechanical Engineering Carnegie Mellon University United States Department of Computer Science and Technology University of Cambridge United Kingdom

In the field of large-scale SLAM for autonomous driving and mobile robotics, 3D point cloud based place recognition has aroused significant research interest due to its robustness to changing environments with drastic daytime and weather variance. However, it is time-consuming and effort-costly to obtain high-quality point cloud data for place recognition model training and ground truth for registration in the real world. To this end, a novel registration-aided 3D domain adaptation network for point cloud based place recognition is proposed. A structure-aware registration network is introduced to help to learn features with geometric information and a 6-DoFs pose between two point clouds with partial overlap can be estimated. The model is trained through a synthetic virtual LiDAR dataset through GTA-V with diverse weather and daytime conditions and domain adaptation is implemented to the real-world domain by aligning the global features. Our results outperform state-of-the-art 3D place recognition baselines or achieve comparable on the real-world Oxford RobotCar dataset with the visualization of registration on the virtual dataset. Copyright © 2020, The Authors. All rights reserved.

关键词： Three dimensional computer graphics