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Fault Prognostics of Rolling Bearings Using a Hybrid Approach ⁎

IFAC-PapersOnLine 2020年第2期53卷 4082-4087页

作者： Murilo Osorio Camargos Iury Bessa Marcos Flávio Silveira Vasconcelos D’Angelo Reinaldo Martinez Palhares Federal University of Minas Gerais - Graduate Program in Electrical Engineering Brazil Federal University of Amazonas Department of Electricity Manaus Brazil Departament of Computer Science - Universidade Estadual de Montes Claros - Av. Rui Braga s/n Vila Mauricéia 39401-089 Montes Claros MG Brasil Federal University of Minas Gerais - Department of Electronics Engineering Brazil

This paper presents a two-phase hybrid prognostics approach; in the first phase, the model’s parameters are estimated using available training data in the least squares sense using the Levenberg-Marquardt algorithm. The second phase consists of using a particle filter to update the knowledge acquired so far and to predict future states of the system using in the Bayesian sense. The approach is used for an accelerated ball bearing data set, the PRONOSTIA platform, where a general fractional polynomial model is proposed as degradation model. The results of the Remaining Useful Life estimation are compared with another work in the literature, indicating its suitability and competitiveness for prognostics in this data set.

关键词： Prognostics health management remaining useful life particle filter hybrid prognostics accelerated ball bearings

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Decoding Transition between Kinematics Stages for Brain-Machine Interface*

Decoding Transition between Kinematics Stages for Brain-Mach...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Shuhang Chen Xiang Zhang Xiang Shen Yifan Huang Yiwen Wang Program of Bioengineering Hong Kong University of Science and Technology department of Electronic and Computer Engineering Hong Kong University of Science and Technology department of Chemical and Biological Engineering Hong Kong University of Science and Technology

ISBN: (纸本)9781728145709

Brain-machine interfaces (BMIs) translate the neural activity into digital command to control external devices in accomplishing movement task, which could involve multiple stages of behaviors in sequence. Previous work generally discriminates the stage labels using a classifier and uses a combination of sub-decoders designed respectively for each stage. Without considering the time dynamics of neural activity, the classifier often introduces noisy estimation in stage prediction. Brain-controlling neuro-prosthesis requires the decoder to continuously output the kinematics interpretation on brain state for each time instance, including when to start or end each stage within the task smoothly and accurately. We propose to decode the kinematic states within stages and during stage transition in one paradigm. The kinematics state vector is extended, and the time dynamics is modelled in the state-observation framework. We validate our approach on a brain-controlled lever discrimination task. The rats need to adjust the neural activity to press the correct virtual lever and drives the brain state to trigger the start of the next trial. Compared with the existing method whose mean square error is 0.8038, our results show smoother transition prediction and better decoding accuracy with less mean square error which is 0.7922. And the correction rate of holding lever and rest is above 90%. These results help the subjects do the task with even less response time (2.81s) and shorter inter-trial duration (4.5s).

关键词： Decoding Kinematics Pressing Neural activity Task analysis Rats Human factors

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Routing Optical Spin and Pseudospin with Metasurfaces

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Physical Review Applied 2020年第1期14卷 014029-014029页

作者： Yarden Mazor Andrea Alù Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Physics Program Graduate Center City University of New York New York New York 10026 USA

Controlling and guiding optical spins and pseudospins over an interface is of great importance in the emerging fields of spintronics and valleytronics, holding the promise for new degrees of freedom in the quest for efficient information transport. Here we explore the general possibilities offered by metasurfaces to route optical momentum, spin and helicity through surface waves. We show how anisotropy and bianisotropy can be engineered to impart extreme directionality to local spin excitations. While most previous works have focused on out-of-plane spins, in-plane excitations have become particularly important for valleytronic applications relying on two-dimensional materials, and they offer specific challenges addressed here with suitably engineered nonlocality in metasurfaces.

关键词： Metamaterials Optical vortices Photonics Valleytronics Devices Surfaces Transition metal dichalcogenides

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Interactive Protocols for Classically-Verifiable Quantum Advantage

arXiv

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arXiv 2021年

作者： Zhu, Daiwei Kahanamoku-Meyer, Gregory D. Lewis, Laura Noel, Crystal Katz, Or Harraz, Bahaa Wang, Qingfeng Risinger, Andrew Feng, Lei Biswas, Debopriyo Egan, Laird Gheorghiu, Alexandru Nam, Yunseong Vidick, Thomas Vazirani, Umesh Yao, Norman Y. Cetina, Marko Monroe, Christopher Joint Quantum Institute Departments of Physics and Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Joint Center for Quantum Information and Computer Science NIST University of Maryland College ParkMD20742 United States Department of Physics University of California BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Computing and Mathematical Sciences California Institute of Technology CA91125 United States Division of Physics Mathematics and Astronomy California Institute of Technology CA91125-0001 United States Duke Quantum Center Department of Physics Duke University DurhamNC27708 United States Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States IonQ Inc. College ParkMD20740 United States Institute for Theoretical Studies ETH Zürich CH 8001 Switzerland Chemical Physics Program Institute for Physical Science and Technology University of Maryland College ParkMD20742 United States Departments of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States

Interaction is a powerful resource for quantum computation. It can be utilized in applications ranging from the verification of quantum algorithms all the way to verifying quantum mechanics itself. Here, we present the first implementation of interactive protocols for proofs of quantumness — which when suitably scaled promise the efficient verification of quantum computational advantage. The key feature that distinguishes these protocols from existing demonstrations of quantum advantage is that the classical verification is efficient and scales polynomially rather than exponentially with the number of qubits. The experimental implementation of such interactive protocols requires the ability to independently measure subsets of qubits in the middle of a quantum circuit and to continue coherent evolution afterwards. This is achieved by spatially isolating target qubits via shuttling, and opens the door to a range of quantum interactive protocols as well as new information processing architectures. Copyright © 2021, The Authors. All rights reserved.

关键词： Qubits

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Exploiting Approximations in Supervisory Control with Distinguishers

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IFAC-PapersOnLine 2018年第7期51卷 13-18页

作者： Rosa, Marcelo Teixeira, Marcelo Malik, Robi Graduate Program in Electrical Engineering Federal University of Technology Paraná Pato Branco Brazil Department of Computer Science University of Waikato Hamilton New Zealand

Distinguishers have been used in Supervisory Control Theory (SCT) of Discrete Event Systems, as a way to simplify modeling tasks. Approximations complement this approach with an alternative to also reduce synthesis effort. Despite the advantages, supervisors obtained from approximated DES plants can be suboptimal, so that the modeling structure has to be reconstructed empirically, until the proper supervisor is found. In this paper we show how to construct suitable-approximations that always lead to least restrictive controllable synthesis. A manufacturing system example is provided to illustrate the approach. © 2018

关键词： Discrete event simulation Automation Control engineering Control theory Controllability Manufacture Models Supervisory personnel Controllable synthesis Distinguishers Modeling structures Modeling task Supervisory control Supervisory control theory

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3D Crumpled Ultrathin 1T MoS2 for Inkjet Printing of Mg-Ion Asymmetric Micro-supercapacitors (vol 14, pg 7308, 2020)

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ACS NANO 2020年第10期14卷 14247-14247页

作者： Shao, Yuanlong Fu, Jui-Han Cao, Zhen Song, Kepeng Sun, Ruofan Wan, Yi Shamim, Atif Cavallo, Luigi Han, Yu Kaner, Richard B. Tung, Vincent C. College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS) Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 People’s Republic of China Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Electrical Engineering Program Computer Electrical and Mathematical Sciences (CEMS) Division KAUST Thuwal 23955-6900 Saudi Arabia Department of Chemistry and Biochemistry Department of Materials Science and Engineering California NanoSystems Institute (CNSI) University of California Los Angeles Los Angeles California 90095 United States

Metallic molybdenum disulfide (MoS2),e.g., 1T phase, is touted as a highly promising material for energy storage that already displays a great capacitive performance. However, due to its tendency to aggregate and restack, it remains a formidable challenge to assemble a high-performance electrode without scrambling the intrinsic structure. Here, we report an electrohydrodynamic-assisted fabrication of 3D crumpled MoS2(c-MoS2) and its formation of an additive-free stable ink for scalable inkjet printing. The 3D c-MoS2powders exhibited a high concentration of metallic 1T phase and an ultrathin structure. The aggregation-resistant properties of the 3D crumpled particles endow the electrodes with open space for electrolyte ion transport. Importantly, we experimentally discovered and theoretically validated that 3D 1T c-MoS2enables an extended electrochemical stable working potential range and enhanced capacitive performance in a bivalent magnesium-ion aqueous electrolyte. With reduced graphene oxide (rGO) as the positive electrode material, we inkjet-printed 96 rigid asymmetric micro-supercapacitors (AMSCs) on a 4-in. Si/SiO2wafer and 100 flexible AMSCs on photo paper. These AMSCs exhibited a wide stable working voltage of 1.75 V and excellent capacitance retention of 96% over 20 000 cycles for a single device. Our work highlights the promise of 3D layered materials as well-dispersed functional materials for large-scale printed flexible energy storage devices.

关键词： electrical properties Electrodes Energy density Inkjet printing Electrolytes

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A single photon detector with an amorphous/crystalline silicon heterointerface

A single photon detector with an amorphous/crystalline silic...

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Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2019

作者： Yan, Lujiang Abu Raihan Miah, Mohammad Zhou, Jiayun Zhang, Yong Lo, Yu-Hwa Department of Electrical and Computer Engineering University of California San Diego 9500 Gilman Drive San DiegoCA92093 United States Materials Science and Engineering Program University of California San Diego 9500 Gilman Drive San DiegoCA92093 United States

We demonstrate a single photon detector of dual gain sections design with internal control. At 100MHz, it shows over 11% single photon detection efficiency, sub-nanosecond self-recovery time, low excess noise with onl... 详细信息

ISBN: (纸本)9781943580644

关键词： Particle beams

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Robust Multiplexing with Topolectrical Higher-Order Chern Insulators

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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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BPS2025 - Structural basis of potassium selectivity in kalium channelrhodopsins

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Biophysical Journal 2025年第3期124卷 64a-65a页

作者： Seiya Tajima Yoon Seok Kim YoungJu Jo Peter Y. Wang Joseph M. Paggi Charu Ramakrishnan Shunki Takaramoto Takashi Nagata Masae Konno Kota Katayama Hideki Kandori Ron O. Dror Keiichi Inoue Karl Deisseroth Hideaki Kato Research Center for Advanced Science and Technology The University of Tokyo Tokyo Japan Department of Bioengineering Stanford University Stanford CA USA Department of Computer Science Stanford University Stanford CA USA Cracking the Neural Code Program Stanford University Stanford CA USA The Institute for Solid State Physics The University of Tokyo Kashiwa Japan PRESTO Japan Science and Technology Agency Kawaguchi Japan Department of Life Science and Applied Chemistry Nagoya Institute of Technology Nagoya Japan OptoBioTechnology Research Center Nagoya Institute of Technology Nagoya Japan Institute for Computational and Mathematical Engineering Stanford University Stanford CA USA Howard Hughes Medical Institute Stanford University Stanford CA USA Graduate School of Arts and Sciences The University of Tokyo Tokyo Japan

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Basic electrical parameters measurement laboratory: A K-12 outreach project 125

Basic electrical parameters measurement laboratory: A K-12 o...

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125th ASEE Annual Conference and Exposition

作者： Dua, Rohit Department of Electrical and Computer Engineering Missouri University of Science and Technology Cooperative Engineering Program United States

A basic laboratory exercise was designed and implemented, for K-12 students, which delves into the measurement of basics of electrical circuit parameters, such as resistance, current and voltage. This 2-3 hour lab exercise gives students a glimpse into basic electrical engineering concepts, which are covered in an undergraduate Sophomore level introductory Circuits-1 course that all electrical engineering majors are required to take. Laboratory participants cover the same material, in a small amount of time that the undergraduate students cover in 2-3 weeks. The lab exercise also includes an interactive exercise that helps students understand decimal to binary conversion for unsigned and signed decimal numbers via a tool already being used as part of interactive digital logic laboratory experience. In addition, students try their skill in generating power, under varying load conditions, using a bike-power generator as a fun-filled competitive activity. This paper outlines the laboratory exercise learning outcomes, implemented laboratory exercises, observations made, and results of a conducted exit survey. © American Society for engineering Education, 2018.

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