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Author Correction: Sublimed C60 for efficient and repeatable perovskite-based solar cells

Nature communications 2025年第1期16卷 864页

作者： Ahmed A Said Erkan Aydin Esma Ugur Zhaojian Xu Caner Deger Badri Vishal Aleš Vlk Pia Dally Bumin K Yildirim Randi Azmi Jiang Liu Edward A Jackson Holly M Johnson Manting Gui Henning Richter Anil R Pininti Helen Bristow Maxime Babics Arsalan Razzaq Suman Mandal Thomas G Allen Thomas D Anthopoulos Martin Ledinský Ilhan Yavuz Barry P Rand Stefaan De Wolf King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Physical Science and Engineering Division (PSE) Thuwal 23955-6900 Kingdom of Saudi Arabia. ahmedali.ahmed@kaust.edu.sa. King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Physical Science and Engineering Division (PSE) Thuwal 23955-6900 Kingdom of Saudi Arabia. erkan.aydin@kaust.edu.sa. King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Physical Science and Engineering Division (PSE) Thuwal 23955-6900 Kingdom of Saudi Arabia. Department of Electrical and Computer Engineering Princeton University Princeton NJ 08544 USA. Department of Physics Marmara University Istanbul Türkiye. Laboratory of Nanostructures and Nanomaterials Institute of Physics Academy of Sciences of the Czech Republic v. v. i. Cukrovarnická 10 Prague 162 00 Czech Republic. Nano-C Inc. 33 Southwest Park Westwood MA 02090 USA. King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Physical Science and Engineering Division (PSE) Thuwal 23955-6900 Kingdom of Saudi Arabia. stefaan.dewolf@kaust.edu.sa.

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Compact and low loss silicon carbide waveguide with high nonlinearity based on CMOS-compatible platform

Compact and low loss silicon carbide waveguide with high non...

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Nonlinear Optics, NLO 2019

作者： Xing, Peng Ma, Danhao Ooi, Kelvin J. A. Choi, Ju Won Agarwal, Anuradha M. Tan, Dawn T. H. SUTD-MIT International Design Center Singapore University of Technology and Design 8 Somapah Road Singapore Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA United States School of Electrical and Computer Engineering Xiamen University Malaysia Jalan Sunsuria Bandar Sunsuria Sepang Selangor Darul Ehsan43900 Malaysia Materials Research Laboratory Massachusetts Institute of Technology CambridgeMA United States

Silicon carbide ring resonator is demonstrated with intrinsic Q-factor of 160,000. Waveguide with nonlinear parameter 40W-1/m is demonstrated. Material Kerr nonlinearity is measured to be 4.8 ×10-14cm2/W and thre... 详细信息

ISBN: (纸本)9781943580620

关键词： Waveguides

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Characterizing and detecting freezing of gait using multi-modal physiological signals

arXiv

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arXiv 2020年

作者： Wang, Ying Beuving, Floris Nonnekes, Jorik Cohen, Mike X. Long, Xi Aarts, Ronald M. van Wezel, Richard Donders Institute for Brain Cognition and Behaviour Radboud University Nijmegen Netherlands Department of Electrical Engineering Eindhoven University of Technology Eindhoven Netherlands Academic Center for Epileptology Kempenhaeghe Heeze Netherlands Donders Institute for Brain Cognition and Behaviour Department of Rehabilitation Radboud University Medical Centre Nijmegen Netherlands Department of Rehabilitation Sint Maartenskliniek Nijmegen Netherlands Philips Research Eindhoven Netherlands Biomedical Signals and Systems Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands

Freezing-of-gait a mysterious symptom of Parkinson’s disease and defined as a sudden loss of ability to move forward. Common treatments of freezing episodes are currently of moderate efficacy and can likely be improved through a reliable freezing evaluation. Basic-science studies about the characterization of freezing episodes and a 24/7 evidence-support freezing detection system can contribute to the reliability of the evaluation in daily life. In this study, we analyzed multi-modal features from brain, eye, heart, motion, and gait activity from 15 participants with idiopathic Parkinson’s disease and 551 freezing episodes induced by turning in place. Statistical analysis was first applied on 248 of the 551 to determine which multi-modal features were associated with freezing episodes. Features significantly associated with freezing episodes were ranked and used for the freezing detection. We found that eye-stabilization speed during turning and lower-body trembling measure significantly associated with freezing episodes and used for freezing detection. Using a leave-one-subject-out cross-validation, we obtained a sensitivity of 97% ± 3%, a specificity of 96% ± 7%, a precision of 73% ± 21%, a Matthews correlation coefficient of 0.82 ± 0.15, and an area under the Precision-Recall curve of 0.94 ± 0.05. According to the Precision-Recall curves, the proposed freezing detection method using the multi-modal features performed better than using single-modal features. Copyright © 2020, The Authors. All rights reserved.

关键词： Wearable sensors

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Spin and charge interconversion in Dirac semimetal thin films

arXiv

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arXiv 2021年

作者： Yanez, Wilson Ou, Yongxi Xiao, Run Koo, Jahyun Held, Jacob T. Ghosh, Supriya Rable, Jeffrey Pillsbury, Timothy GonzálezDelgado, Enrique Yang, Kezhou Chamorro, Juan Grutter, Alexander J. Quarterman, Patrick Richardella, Anthony Sengupta, Abhronil McQueen, Tyrel Borchers, Julie A. Mkhoyan, K. Andre Yan, Binghai Samarth, Nitin Department of Physics Pennsylvania State University University ParkPA16802 United States Department of Condensed Matter Physics Weizmann Institute of Science Rehovot7610001 Israel Department of Chemical Engineering and Materials Science University of Minnesota MinneapolisMN55455 United States Department of Physics and Electronics Humacao Campus The University of Puerto Rico 100 Tejas Avenue HumacaoPR00791-4300 Puerto Rico Department of Materials Science and Engineering Pennsylvania State University University ParkPA16802 United States Department of Chemistry Johns Hopkins University BaltimoreMD United States NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States School of Electrical Engineering and Computer Science Pennsylvania State University University ParkPA16802 United States

We report spin-to-charge and charge-to-spin conversion at room temperature in heterostructure devices that interface an archetypal Dirac semimetal, Cd3As2, with a metallic ferromagnet, Ni0.80Fe0.20 (permalloy). The spin-charge interconversion is detected by both spin torque ferromagnetic resonance and ferromagnetic resonance driven spin pumping. Analysis of the symmetric and anti-symmetric components of the mixing voltage in spin torque ferromagnetic resonance and the frequency and power dependence of the spin pumping signal show that the behavior of these processes is consistent with previously reported spin-charge interconversion mechanisms in heavy metals, topological insulators, and Weyl semimetals. We find that the efficiency of spin-charge interconversion in Cd3As2/permalloy bilayers can be comparable to that in heavy metals. We discuss the underlying mechanisms by comparing our results with first principles calculations. © 2021, CC BY.

关键词： Ferromagnetic resonance

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Non-orthogonal multiple access for visible light communications with ambient light and user mobility

arXiv

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arXiv 2019年

作者： Mitra, Rangeet Sofotasios, Paschalis C. Bhatia, Vimal Muhaidat, Sami Indian Institute of Information Technology SriCity517646 India Center for Cyber-Physical Systems Department of Electrical Engineering and Computer Science Khalifa University of Science and Technology PO Box 127788 Abu Dhabi United Arab Emirates Department of Electrical Engineering Tampere University Tampere33101 Finland Department of Electrical Engineering Indian Institute of Technology Indore Indore453441 India Center for Cyber-Physical Systems Department of Electrical Engineering and Computer Science Khalifa University of Science and Technology PO Box 127788 Abu Dhabi United Arab Emirates

The ever-increasing demand for high data-rate applications and the proliferation of connected devices pose several theoretical and technological challenges for the fifth generation (5G) networks and beyond. Among others, this includes the spectrum scarcity and massive connectivity of devices, particularly in the context of the Internet of Things (IoT) ecosystem. In this respect, visible light communication (VLC) has recently emerged as a potential solution for these challenges, particularly in scenarios relating to indoor communications. Additionally, nonorthogonal multiple access (NOMA) for VLC has been envisioned to address some of the key challenges in the next generation wireless networks. However, in realistic environments, it has been shown that VLC systems suffer from additive optical interference due to ambient light, and user-mobility which cause detrimental outages and overall degraded data rates. Motivated by this, in this work, we first derive the statistics of the incurred additive interference, and then analyze the rate of the considered NOMA-VLC channel. An analytical expression is subsequently derived for the rate of NOMA-VLC systems with ambient light and user-mobility, followed by the formulation of a power-allocation technique for the underlying scenario, which has been shown to outperform classical gain-ratio power allocation in terms of achievable rate. The obtained analytical results are corroborated with computer simulations for various realistic VLC scenarios of interest, which lead to useful insights of theoretical and practical interest. For example, it is shown that, in a NOMA-enabled VLC system, the maximum rate at which information can be transmitted over a static VLC communication channel with ambient light asymptotically converges to the Shannon Hartley capacity formula. Copyright © 2019, The Authors. All rights reserved.

关键词： Visible light communication

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Opacity of Nondeterministic Transition Systems: A (Bi)Simulation Relation Approach

Opacity of Nondeterministic Transition Systems: A (Bi)Simula...

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作者： Zhang, Kuize Yin, Xiang Zamani, Majid ACCESS Linnaeus Center School of Electrical Engineering KTH Royal Institute of Technology Stockholm10044 Sweden Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Shanghai200240 China Computer Science Department University of Colorado Boulder BoulderCO80309 United States

In this paper, we propose several opacity-preserving (bi)simulation relations for nondeterministic transition systems (NTSs) in terms of initial-state opacity, current-state opacity, K-step opacity, and infinite-step opacity. We also show how one can leverage quotient constructions to compute such relations. As a result, although the opacity verification problem for infinite NTSs is generally undecidable, if one can find such an opacity-preserving relation from an infinite NTS to a finite one, the (lack of) opacity of the infinite NTS can be easily verified over the finite one, which is decidable. © 1963-2012 IEEE.

关键词： Opacity

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Lithography-free Plasmonic color printing with Femtosecond laser on Semicontinuous silver films

arXiv

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arXiv 2020年

作者： Chowdhury, Sarah Nahar Nyga, Piotr Kudyshev, Zhaxylyk A. Bravo, Esteban Garcia Lagutchev, Alexei S. Kildishev, Alexander V. Shalaev, Vladimir M. Boltasseva, Alexandra School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University 1205 W State St West LafayetteIN47907 United States Institute of Optoelectronics Military University of Technology 2 Kaliskiego St Warsaw00-908 Poland Department of Computer Graphics Technology Purdue University Knoy Hall 401 N. Grant St West LafayetteIN47907 United States

Plasmonic color printing with semicontinuous metal films is a lithography-free and environment-friendly method for generating non-fading bright colors. Such films are comprised of islands – metal nanoparticles and their clusters of various dimensions, which resonate at different wavelengths upon external light illumination depending on the size and shape of the local particle structures. To experimentally realize systems that were optimized for achieving a broad color range and increased stability, various silver semicontinuous metal films were deposited on a metallic (Ag) mirror with a sub-wavelength-thick dielectric (SiO2) spacer. Femtosecond laser post-processing was then introduced to extend the color gamut through spectrally induced changes from blue to green, red, and yellow. Long-term stability and durability of the structures were addressed to enable non-fading colors with an optimized overcoating dielectric layer. The thickness of the proposed design is on the order of 100 nanometers, and it can be deposited on any substrate. These structures generate a broad range of long-lasting colors in reflection that can be applied to real-life artistic or technological applications with a spatial resolution on the order of 0.3 mm or less. Copyright © 2020, The Authors. All rights reserved.

关键词： Color

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Cooperative localization with angular measurements and posterior linearization

arXiv

引用

arXiv 2019年

作者： Wu, Yibo Peng, Bile Wymeersch, Henk Seco-Granados, Gonzalo Kakkavas, Anastasios Castañeda Garcia, Mario H. Stirling-Gallacher, Richard A. Department of Electrical Engineering Chalmers University of Technology Munich Research Center Huawei Technologies Duesseldorf GmbH Department of Telecommunications and Systems Engineering Universitat Autonoma de Barcelona Department of Electrical and Computer Engineering Technische Universität München

The application of cooperative localization in vehicular networks is attractive to improve accuracy and coverage. Conventional distance measurements between vehicles are limited by the need for synchronization and provide no heading information of the vehicle. To address this, we present a cooperative localization algorithm using posterior linearization belief propagation (PLBP) utilizing angle-of-arrival (AoA)-only measurements. Simulation results show that both directional and positional root mean squared error (RMSE) of vehicles can be decreased significantly and converge to a low value in a few iterations. Furthermore, the influence of parameters for the vehicular network, such as vehicle density, communication radius, prior uncertainty and AoA measurements noise, is analyzed. Copyright © 2019, The Authors. All rights reserved.

关键词： Linearization

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TCIM: Triangle counting acceleration with processing-in-MRAM architecture

arXiv

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arXiv 2020年

作者： Wang, Xueyan Yang, Jianlei Zhao, Yinglin Qi, Yingjie Liu, Meichen Cheng, Xingzhou Jia, Xiaotao Chen, Xiaoming Qu, Gang Zhao, Weisheng Fert Beijing Research Institute School of Microelectronics Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing China Institute of Computing Technology Chinese Academy of Sciences Beijing China Department of Electrical and Computer Engineering University of Maryland College ParkMD United States

Triangle counting (TC) is a fundamental problem in graph analysis and has found numerous applications, which motivates many TC acceleration solutions in the traditional computing platforms like GPU and FPGA. However, these approaches suffer from the bandwidth bottleneck because TC calculation involves a large amount of data transfers. In this paper, we propose to overcome this challenge by designing a TC accelerator utilizing the emerging processing-in-MRAM (PIM) architecture. The true innovation behind our approach is a novel method to perform TC with bitwise logic operations (such as AND), instead of the traditional approaches such as matrix computations. This enables the efficient in-memory implementations of TC computation, which we demonstrate in this paper with computational Spin-Transfer Torque Magnetic RAM (STT-MRAM) arrays. Furthermore, we develop customized graph slicing and mapping techniques to speed up the computation and reduce the energy consumption. We use a device-to-architecture co-simulation framework to validate our proposed TC accelerator. The results show that our data mapping strategy could reduce 99.99% of the computation and 72% of the memory WRITE operations. Compared with the existing GPU or FPGA accelerators, our in-memory accelerator achieves speedups of 9× and 23.4×, respectively, and a 20.6× energy efficiency improvement over the FPGA accelerator. Copyright © 2020, The Authors. All rights reserved.

关键词： Data transfer

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An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

arXiv

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arXiv 2022年

作者： Amiri, Mandana Bandura, Kevin Boskovic, Anja Chen, Tianyue Cliche, Jean-François Deng, Meiling Denman, Nolan Dobbs, Matt Fandino, Mateus Foreman, Simon Halpern, Mark Hanna, David Hill, Alex S. Hinshaw, Gary Höfer, Carolin Kania, Joseph Klages, Peter Landecker, T.L. Maceachern, Joshua Masui, Kiyoshi Mena-Parra, Juan Milutinovic, Nikola Mirhosseini, Arash Newburgh, Laura Nitsche, Rick Ordog, Anna Pen, Ue-Li Pinsonneault-Marotte, Tristan Polzin, Ava Reda, Alex Renard, Andre Richard Shaw, J. Siegel, Seth R. Singh, Saurabh Smegal, Rick Tretyakov, Ian van Gassen, Kwinten Vanderlinde, Keith Wang, Haochen Wiebe, Donald V. Willis, James S. Wulf, Dallas Department of Physics and Astronomy University of British Columbia VancouverBC Canada Department of Computer Science and Electrical Engineering West Virginia University MorgantownWV United States Center for Gravitational Waves and Cosmology West Virginia University MorgantownWV United States MIT Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA United States Department of Physics McGill University MontrealQC Canada Dominion Radio Astrophysical Observatory Herzberg Astronomy & Astrophysics Research Centre National Research Council Canada PentictonBC Canada Perimeter Institute for Theoretical Physics WaterlooON Canada David A. Dunlap Department of Astronomy & Astrophysics University of Toronto TorontoON Canada Department of Physical Sciences Thompson Rivers University KamloopsBC Canada Department of Computer Science Math Physics and Statistics University of British Columbia-Okanagan KelownaBC Canada Department of Physics and Astronomy West Virginia University MorgantownWV United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States Department of Physics Yale University New HavenCT United States Canadian Institute for Theoretical Astrophysics TorontoON Canada Dunlap Institute for Astronomy and Astrophysics University of Toronto TorontoON Canada Institute of Astronomy and Astrophysics Academia Sinica Taipei Taiwan Department of Astronomy Yale University New HavenCT United States Raman Research Institute Sadashivanagar Bengaluru India Department of Physics University of Toronto TorontoON Canada

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400 MHz to 800 MHz band. CHIME is located at the Dominion Radio Astrophysical Observatory near Penticton, BC Canada. The instrument is designed to map neutral hydrogen over the redshift range 0.8 to 2.5 to constrain the expansion history of the Universe. This goal drives the design features of the instrument. CHIME consists of four parallel cylindrical reflectors, oriented north-south, each 100 m × 20 m and outfitted with a 256 element dual-polarization linear feed array. CHIME observes a two degree wide stripe covering the entire meridian at any given moment, observing 3/4 of the sky every day due to Earth rotation. An FX correlator utilizes FPGAs and GPUs to digitize and correlate the signals, with different correlation products generated for cosmological, fast radio burst, pulsar, VLBI, and 21 cm absorber backends. For the cosmology backend, the Nfeed2 correlation matrix is formed for 1024 frequency channels across the band every 31 ms. A data receiver system applies calibration and flagging and, for our primary cosmological data product, stacks redundant baselines and integrates for 10 s. We present an overview of the instrument, its performance metrics based on the first three years of science data, and we describe the current progress in characterizing CHIME's primary beam response. We also present maps of the sky derived from CHIME data;we are using versions of these maps for a cosmological stacking analysis as well as for investigation of Galactic foregrounds. © 2022, CC BY.

关键词： Interferometers

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