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arXiv 2017年

作者： Vahidian, Saeed Najafi, Maryam Najafi, Marzieh Al-Qahtani, Fawaz S. Electrical and Computer Engineering University of Illinois Chicago United States Electrical and Computer Engineering Shiraz University of Technology Shiraz Iran Electrical and Computer Engineering K. N. Toosi University of Technology Tehran Iran Electrical and Computer Engineering Program Texas AandM University Doha Qatar

In this paper, we investigate the performance of a dual-hop block fading cognitive radio network with underlay spectrum sharing over independent but not necessarily identically distributed (i.n.i.d.) Nakagami-m fading channels. The primary network consists of a source and a destination. Depending on whether the secondary network which consists of two source nodes have a single relay for cooperation or multiple relays thereby employs opportunistic relay selection for cooperation and whether the two source nodes suffer from the primary users' (PU) interference, two cases are considered in this paper, which are referred to as Scenario (a) and Scenario (b), respectively. For the considered underlay spectrum sharing, the transmit power constraint of the proposed system is adjusted by interference limit on the primary network and the interference imposed by primary user (PU). The developed new analysis obtains new analytical results for the outage capacity (OC) and average symbol error probability (ASEP). In particular, for Scenario (a), tight lower bounds on the OC and ASEP of the secondary network are derived in closed-form. In addition, a closed from expression for the end-to-end OC of Scenario (a) is achieved. With regards to Scenario (b), a tight lower bound on the OC of the secondary network is derived in closed-form. All analytical results are corroborated using Monte Carlo simulation method. Copyright © 2017, The Authors. All rights reserved.

关键词： Cognitive radio

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A high-order log barrier-based mesh generation and warping method

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Procedia engineering 2017年 203卷 180-192页

作者： Mike Stees Suzanne M. Shontz Department of Electrical Engineering and Computer Science Information and Telecommunication Technology Center The University of Kansas Lawrence KS 66045 USA Department of Electrical Engineering and Computer Science Bioengineering Graduate Program Information and Telecommunication Technology Center The University of Kansas Lawrence KS 66045 USA

The ability to generate high-order meshes that conform to the boundary of curved geometries is a hurdle in the adoption of high-order computational methods for the numerical solution of partial differential equations. In this paper, we propose a method for generating and warping second-order Lagrange triangular and tetrahedral meshes based on a log barrier method. In the case of generation, the approach consists of modifying an initial linear mesh by first, adding nodes at the midpoint of each edge; second, displacing the newly added boundary midpoints to the curved boundary, and third, solving for the final positions of the interior nodes based on the boundary deformation. By allowing all of the boundary nodes to move, the approach can also be used to warp second-order triangular and tetrahedral meshes. We present several numerical examples in both two and three dimensions which demonstrate the capabilities of our method in generating and warping second-order curvilinear meshes.

关键词： high-order mesh generation curvilinear high-order mesh high-order mesh warping numerical optimization

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Eavesdropper’s ability to attack a free-space quantum-key-distribution receiver in atmospheric turbulence

arXiv

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arXiv 2019年

作者： Chaiwongkhot, Poompong Kuntz, Katanya B. Zhang, Yanbao Huang, Anqi Bourgoin, Jean-Philippe Sajeed, Shihan Lütkenhaus, Norbert Jennewein, Thomas Makarov, Vadim Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada NTT Basic Research Laboratories NTT Corporation AtsugiKanagawa Japan NTT Research Center for Theoretical Quantum Physics NTT Corporation AtsugiKanagawa Japan Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Aegis Quantum WaterlooON Canada Department of Electrical and Computer Engineering University of Toronto M5S 3G4 Canada Quantum Information Science Program Canadian Institute for Advanced Research TorontoONM5G 1Z8 Canada Russian Quantum Center Skolkovo Moscow143025 Russia Shanghai Branch National Laboratory for Physical Sciences at Microscale and CAS Center for Excellence in Quantum Information University of Science and Technology of China Shanghai201315 China NTI Center for Quantum Communications National University of Science and Technology MISiS Moscow119049 Russia

The ability of an eavesdropper (Eve) to perform an intercept-resend attack on a free-space quantum key distribution (QKD) receiver by precisely controlling the incidence angle of an attack laser has been previously demonstrated. However, such an attack could be ineffective in the presence of atmospheric turbulence due to beam wander and spatial mode aberrations induced by the air’s varying index of refraction. We experimentally investigate the impact turbulence has on Eve’s attack on a free-space polarization-encoding QKD receiver by emulating atmospheric turbulence with a spatial light modulator. Our results identify how well Eve would need to compensate for turbulence to perform a successful attack by either reducing her distance to the receiver, or using beam wavefront correction via adaptive optics. Furthermore, we use an entanglement-breaking scheme to find a theoretical limit on the turbulence strength that hinders Eve’s attack. Copyright © 2019, The Authors. All rights reserved.

关键词： Atmospheric turbulence

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Current and future uses of UAS for improved forecasts/warnings and scientific studies

Current and future uses of UAS for improved forecasts/warnin...

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作者： McFarquhar, Greg M. Smith, Elizabeth Pillar-Little, Elizabeth A. Brewster, Keith Chilson, Phillip B. Lee, Temple R. Waugh, Sean Yussouf, Nusrat Wang, Xuguang Xue, Ming de Boer, Gijs Gibbs, Jeremy A. Fiebrich, Chris Baker, Bruce Brotzge, Jerry Carr, Frederick Christophersen, Hui Fengler, Martin Hall, Philip Hock, Terry Houston, Adam Huck, Robert Jacob, Jamey Palmer, Robert Quinn, Patricia K. Wagner, Melissa Zhang, Yan Hawk, Darren Cooperative Institute for Mesoscale Meteorological Studies School of Meteorology University of Oklahoma NormanOK United States Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma NOAA National Severe Storms Laboratory NormanOK United States School of Meteorology Center for Autonomous Sensing and Sampling University of Oklahoma NormanOK United States Center for Analysis and Prediction of Storms University of Oklahoma NormanOK United States Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma NormanOK United States NOAA Air Resources Laboratory/Atmospheric Turbulence and Diffusion Division Oak RidgeTN United States NOAA National Severe Storms Laboratory NormanOK United States Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma NormanOK United States School of Meteorology University of Oklahoma NormanOK United States School of Meteorology Center for Analysis and Prediction of Storms University of Oklahoma NormanOK United States Cooperative Institute for Research on Environmental Studies University of Colorado Boulder NOAA Physical Sciences Division BoulderCO United States Oklahoma Climatological Survey University of Oklahoma NormanOK United States NOAA Air Resources Laboratory Atmospheric Turbulence and Diffusion Division Oak RidgeTN United States University at Albany State University of New York AlbanyNY United States Cooperative Institute of Marine and Atmospheric Studies University of Miami NOAA Atlantic Oceanographic and Meteorological Laboratory Hurricane Research Division MiamiFL United States Meteomatics AG Saint Gall Switzerland NOAA Unmanned Aircraft Systems Program Office Silver SpringMD United States National Center for Atmospheric Research BoulderCO United States University of Nebraska Lincoln Nebraska United States Advanced Technology Initiatives Choctaw Nation of Oklahoma DuranOK United States Oklahoma State University Stillwate

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Polaritonic frequency-comb generation and breather propagation in a negative-index metamaterial with a cold four-level atomic medium

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Physical Review A 2019年第5期99卷 051802(R)-051802(R)页

作者： Saeid Asgarnezhad-Zorgabad Pierre Berini Barry C. Sanders Department of Physics Sharif University of Technology Tehran 11365 11155 Iran Institute for Quantum Science and Technology University of Calgary Calgary Alberta Canada T2N 1N4 Department of Physics University of Ottawa 150 Louis-Pasteur Ottawa Ontario Canada K1N 6N5 Centre for Research in Photonics University of Ottawa 25 Templeton St. Ottawa Ontario Canada K1N 6N5 School of Electrical Engineering and Computer Science 700 King Edward St. Ottawa Ontario Canada K1N 6N5 Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario Canada M5G 1M1

We develop a concept for a waveguide that exploits spatial control of nonlinear surface-polaritonic waves. Our scheme includes an optical cavity with four-level N-type atoms in a lossless dielectric placed above a negative-index metamaterial layer. We propose exciting a polaritonic Akhmediev breather at a certain position of the interface between the atomic medium and the metamaterial by modifying laser-field intensities and detunings. Furthermore, we propose generating position-dependent polaritonic frequency combs by engineering widths of the electromagnetically induced transparency window commensurate with the surface-polaritonic modulation instability. Therefore, this waveguide acts as a high-speed polaritonic modulator and position-dependent frequency-comb generator, which can be applied to compact photonic chips.

关键词： Metamaterials Nonlinear optics Plasmonics Quantum optics

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Exploring Observational Heliophysics Across All Scales: Reflections and Insights From the 2023 NASA Heliophysics Summer School

Perspectives of Earth and Space Scientists

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Perspectives of Earth and Space Scientists 2024年第1期5卷

作者： S. R. Shaver A. R. Smith S. S. Babu Y. Baruah M. Bauer V. Chaturmutha H. Chen B. Dalal G. B. Dias da Silva T. Eddy G. González S. Gu E. Gülay A. P. Hoffmann O. R. Idolor R. Khan Y. Liou N. Liu X. Lyu A. Maharana D. K. V. Radhakrishnan O. M. Romeo P. O. C. Silva H. M. Salah C. Thibeault A. Weiss Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA Geophysical Institute University of Alaska Fairbanks AK USA Department of Physics University of Alberta Edmonton AB Canada Department of Physical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur West Bengal India Center of Excellence in Space Sciences India Indian Institute of Science Education and Research Kolkata Mohanpur West Bengal India Austrian Space Weather Office GeoSphere Austria Graz Austria Department of Physics & Astronomy Georgia State University Atlanta GA USA Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Space and Atmospheric Sciences Physical Research Laboratory Ahmedabad Gujarat India National Institute for Space Research (INPE) São Paulo Brazil Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA Space Sciences Laboratory University of California Berkeley Berkeley CA USA Department of Physics University of Texas at Dallas Richardson TX USA Istanbul Technical University Istanbul Turkiye Department of Physics Faculty of Science University of Lagos Lagos Nigeria Indian Institute of Astrophysics Bangalore Karnataka India Department of Engineering Physics Embry-Riddle Aeronautical University Daytona Beach FL USA New Jersey Institute of Technology Newark NJ USA West Virginia University Morgantown WV USA Katholieke Universiteit Leuven Leuven Belgium University of Texas at San Antonio San Antonio TX USA Southwest Research Institute San Antonio TX USA Physics Department Faculty of Science Space Weather Monitoring Center Helwan University Cairo Egypt Université de Montréal Montréal QC Canada NASA Postdoctoral Program Fellowship NASA Goddard Space Flight Center Greenbelt MD USA

The field of heliophysics encompasses a diverse range of research areas and rich plasma environments, from the solar dynamo and solar wind turbulence, to the complex terrestrial thermosphere-ionosphere-magnetosphere (TIM) system, to investigations of both induced and intrinsic magnetospheres across the solar system. This perspective paper delves into the experiences and outcomes of a summer school held in person in Boulder, Colorado, USA, from 7–11 August, which offered a platform for interdisciplinary learning and collaboration. The event, supported by NASA's Living with a Star program and hosted by the University Corporation for Atmospheric Research and Cooperative programs for the Advancement of Earth System Science, assembled a cohort of 26 graduate students and postdoctoral researchers from around the world, all engaged in heliophysics research. The summer school included a series of lectures, interactive activities, and a culminating capstone project. The participants' diverse backgrounds enriched discussions and encouraged novel approaches to traditional problems. The capstone projects spanned an array of topics, including investigating the origins of solar wind switchbacks, dissecting the sequence of events from solar eruptions and their corresponding terrestrial consequences, investigating the energy transfer from solar coronal mass ejections to Earth's magnetosphere, and advocating for the exploration of Coulomb collisions in understanding large-scale global systems. Through this perspective, we shed light on the value of international and interdisciplinary collaboration in advancing heliophysics research. This perspective paper encapsulates the ethos of the summer school, serving as a testament to the continuing and collective pursuit of unraveling the mysteries of the heliosphere. Cooperative programs for the Advancement of Earth System Science/University Corporation for Atmospheric Research held the seventeenth annual NASA Heliophysics Summer School bot

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Consensus Recommendations for Hyperpolarized [1‐13C]pyruvate MRI Multi-center Human Studies

arXiv

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arXiv 2025年

作者： Punwani, Shonit Larson, Peder E.Z. Laustsen, Christoffer VanderMeulen, Jan Ardenkjær-Larsen, Jan Henrik Autry, Adam W. Bankson, James A. Bernard, Jenna Bok, Robert Bertelsen, Lotte Bonde Che, Jenny Chen, Albert P. Chowdhury, Rafat Comment, Arnaud Cunningham, Charles H. Dang, Duy Gallagher, Ferdia A. Gaunt, Adam Gong, Yangcan Gordon, Jeremy W. Grimmer, Ashley Grist, James Hansen, Esben Søvsø Szocska Lerche, Mathilde Hauge Hesketh, Richard L. Hoevener, Jan-Bernd Hsieh, Ching-Yi Keshari, Kayvan R. Kozerke, Sebastian Lanz, Titus Mayer, Dirk McLean, Mary Park, Jae Mo Slater, Jim Tyler, Damian Vanderheyden, Jean-Luc von Morze, Cornelius Zaccagna, Fulvio Zaha, Vlad Xu, Duan Vigneron, Daniel Department of Radiology University College London Hospital NHS Foundation Trust London United Kingdom Centre for Medical Imaging University College London London United Kingdom Department of Radiology and Biomedical Imaging University of California San FranciscoCA94143 United States The MR Research Center Department of Clinical Medicine Aarhus University Aarhus Denmark Department of Health Services Research & Policy London School of Hygiene & Tropical Medicine London United Kingdom Department of Imaging Physics The University of Texas MD Anderson Cancer Center HoustonTX United States GE Healthcare TorontoON Canada GE HealthCare Pollards Wood Nightingales Lane Chalfont St Giles BuckinghamshireHP8 4SP United Kingdom Physical Sciences Sunnybrook Research Institute TorontoON Canada Department of Medical Biophysics University of Toronto TorontoON Canada Department of Radiology University of Cambridge Cambridge University Hospitals NHS Foundation Trust Cambridge United Kingdom GE Healthcare San FranciscoCA United States Oxford Centre for Clinical Magnetic Resonance Research University of Oxford Oxford United Kingdom Department of Health Technology Technical University of Denmark Kgs. Lyngby2800 Denmark Cancer Research UK Cambridge Institute University of Cambridge Cambridge United Kingdom Section Biomedical Imaging University Hospital Schleswig-Holstein Kiel University Campus Kiel Germany Research Center for Radiation Medicine Chang Gung University Taoyuan Taiwan Department of Medical Imaging and Intervention Chang Gung Memorial Hospital at Linkou Taoyuan Taiwan Department of Radiology Memorial Sloan Kettering Cancer Center New YorkNY United States Molecular Pharmacology Program Memorial Sloan Kettering Cancer Center New YorkNY United States Institute for Biomedical Engineering University and ETH Zurich Zurich Switzerland RAPID Biomedical GmbH Rimpar97222 Germany Department of Diagnostic Radiology and Nuclear Medicine University of Mary

Magnetic resonance imaging of hyperpolarized (HP) [1-13C]pyruvate allows in-vivo assessment of metabolism and has translated into human studies across diseases at 15 centers worldwide. Consensus on best practice for multi-center studies is required to develop clinical applications. This paper presents the results of a 2-round formal consensus building exercise carried out by experts with HP [1-13C]pyruvate human study experience. Twenty-nine participants from 13 sites brought together expertise in pharmacy methods, MR physics, translational imaging, and data-analysis;with the goal of providing recommendations and best practice statements on conduct of multi-center human studies of HP [1-13C]pyruvate MRI. Overall, the group reached consensus on approximately two-thirds of 246 statements in the questionnaire, covering ‘HP 13C-Pyruvate Preparation’, ‘MRI System Setup, Calibration, and Phantoms’, ‘Acquisition and Reconstruction’, and ‘Data Analysis and Quantification’. Consensus was present across categories, examples include that: (i) different HP pyruvate preparation methods could be used in human studies, but that the same release criteria have to be followed;(ii) site qualification and quality assurance must be performed with phantoms and that the same field strength must be used, but that the rest of the system setup and calibration methods could be determined by individual sites;(iii) the same pulse sequence and reconstruction methods were preferable, but the exact choice should be governed by the anatomical target;(iv) normalized metabolite area-under-curve (AUC) values and metabolite AUC were the preferred metabolism metrics. The work confirmed areas of consensus for multi-center study conduct and identified where further research is required to ascertain best practice. © 2025, CC BY.

关键词： Redundancy

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Retracted: The Effect of Mixed Pertamax with Tuak Nias (Tuonifaro) on Fuel Consumption at 125CC Machine and Its Dissemination Using Website

Retracted: The Effect of Mixed Pertamax with Tuak Nias (Tuon...

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2018 Workshop on Multidisciplinary and Its Applications: Applied Mathematics, computer Science, Information Systems, and Information technology, WMA-Mathcomtech 2018

作者： Achmad Daengs, G.S. Tarigan, Kristian Ongko, Erianto Hartono, H. Abdullah, Dahlan Erliana, Cut Ita Nurmawati, N. Sallu, Sulfikar Sriadhi, S. Iskandar, Akbar Kurniasih, Nuning Daengs, Achmad Nanuru, Ricardo Freedom Saleh, A.A. Setiawan, Muhammad Ikhsan Hadikurniawati, Wiwien Winarno, Edy Department of Mechanical Engineering Universitas Darma Agung Medan Indonesia Department of Informatics Akademi Teknologi Industri Immanuel Indonesia Department of Computer Science STMIK IBBI Medan Indonesia Department of Informatics Universitas Malikussaleh Aceh Indonesia Department of Industrial Engineering Universitas Malikussaleh Aceh Indonesia Faculty of Industry Technique University of 45 Surabaya Indonesia Faculty of Information Technology Universitas Sembilan Belas November Kolaka Sulawesi Tenggara Indonesia Department of Electrical Engineering Universitas Negeri Medan Indonesia Department of Informatics STMIK AKBA Makassar Indonesia Faculty of Communication Sciences Library and Information Science Program Universitas Padjadjaran Bandung Indonesia Department of Management Universitas 45 Surabaya Indonesia Universitas Kristen Indonesia Maluku. Ambon Indonesia Statistics Financial and Social Sciences Research Group Indonesia Department of Civil Engineering Narotama University Surabaya Indonesia Faculty of Information Technology Universitas Stikubank Semarang Indonesia

The purpose of this research is to know how influence of mixture of pertamax with Tuak Nias (Tuonifaro) to fuel consumption at 125 cc engine To prove that Tuak Nias or Tuonifaro can be used as fuel mixture on motorcycle and examine how big influence of mix between Tuak Nias or Tuonifaro with Pertamax, conducting research by literature study method or literature study. Many authors use various supporting / input factors and supporting books related to the titles discussed. because Tuak Nias or tuonifaro contain low 4-5% ethanonic elements and contain 90% alcoholic elements so that the fuel easily burns easily in the combustion chamber and produces great power. The results of this research will be disseminated using the website. © Published under licence by IOP Publishing Ltd.

关键词： Information systems

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Vibration analysis of a cantilever beam with viscoelastic neutralizers using fiber bragg gratings 17

Vibration analysis of a cantilever beam with viscoelastic ne...

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17th SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, IMOC 2017

作者： Linessio, Rafael Pomorski Da Silva, Jean Carlos Cardozo Dos Santos Tavares, Lucas Henrique Da Silva, Thiago Bavastri, Carlos Alberto Federal University of Technology-Parana Graduate Program in Electrical and Computer Engineering Av. Sete de Setembro 3165 Curitiba-PR-ZIP80.230-910 Brazil Federal University of Parana Graduate Program in Mechanical Engineering Av. Coronel Francisco Heraclito dos Santos 100 Curitiba-PR ZIP81.531-980 Brazil

ISBN: (纸本)9781509062416

In this paper the vibration analysis of a cantilever beam with viscoelastic neutralizer using fiber Bragg gratings (FBG) is presented. The optimal design, of the neutralizer, is achieved through a robust methodology developed by the Research Group on Vibrations and Sound in Mechanical Systems (GVIBS) at Federal University of Parana (UFPR). Such methodology uses the Finite Element Method (FEM) to obtain the modal analysis of the system that will be controlled. The Generalized Equivalent Parameters (GEP) and Nonlinear Optimization Techniques (NLOT) are applied. The viscoelastic neutralizer was projected to control the range of frequency 250 Hz to 470 Hz. To verify the efficiency of the neutralizer the response of the FBG was compared with the response of the piezoelectric accelerometer. Both systems were positioned close to the clamped part of the beam. The analysis presents the efficiency of the viscoelastic neutralizer, proven by decrease of amplitude for the analyzed range when using the optical technique (25 dB) and traditional sensor (32 dB). This study allows validating the effectiveness of the vibration measurements of the FBG to the viscoelastic neutralizers projects. © 2017 IEEE.

关键词： Cantilever beams

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A blind deconvolution approach to discontinuity location and characterization in ultrasonic nondestructive testing

A blind deconvolution approach to discontinuity location and...

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European Signal Processing Conference (EUSIPCO)

作者： Giovanni A. Guarneri Daniel R. Pipa Flávio Neves Lúcia V. R. de Arruda Graduate Program in Electrical Engineering (PPGEE) Federal University of Technology - Paraná (UTFPR) Pato Branco Paraná Brazil Graduate Program in Electrical and Computer Engineering (CPGEI) Federal University of Technology - Paraná (UTFPR) Curitiba Paraná Brazil

This paper presents a new algorithm for discontinuity location and characterization using A-scan signals from an ultrasonic inspection system. The algorithm is based on solving an inverse problem in which the observation model is different from that traditionally used. In this model, the input vector represents the location of the geometrical center of the discontinuity and the scattering amplitude of the discontinuity is embedded in the impulse response of the ultrasonic inspection system. First, we jointly estimate the locations and the scattering amplitudes of the discontinuities from the acquired signals. Then, the geometrical parameters of the discontinuities are calculated from the estimated scattering amplitude. The method is tested to characterize side-drilled holes using both synthetic and real data. The results demonstrates the effectiveness of the algorithm.

关键词： Signal processing algorithms Synchronous digital hierarchy Scattering Transducers Acoustics Approximation algorithms Europe

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