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Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration

High Power Laser science and Engineering 2023年第4期11卷 59-69页

作者： N.Xu M.J.V.Streeter O.C.Ettlinger H.Ahmed S.Astbury M.Borghesi N.Bourgeois C.B.Curry S.J.D.Dann N.P.Dover T.Dzelzainis V.Istokskaia M.Gauthier L.Giuffrida G.D.Glenn S.H.Glenzer R.J.Gray J.S.Green G.S.Hicks C.Hyland M.King B.Loughran D.Margarone O.McCusker P.McKenna C.Parisuaña P.Parsons C.Spindloe D.R.Symes F.Treffert C.A.J.Palmer Z.Najmudin John Adams Institute for Accelerator Science Blackett LaboratoryImperial College LondonLondonUK School of Maths and Physics Queen’s University BelfastBelfastUK Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUK SLAC National Accelerator Laboratory Menlo ParkUSA ELI Beamlines Centre Institute of PhysicsCASDolni BrezanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic Department of Physics SUPAUniversity of StrathclydeGlasgowUK Department of Mechanical Engineering Stanford UniversityStanfordUSA Department of Applied Physics Stanford UniversityStanfordUSA Department of Electrical and Computer Engineering University of AlbertaEdmontonCanada Institut für Kernphysik Technische Universität DarmstadtDarmstadtGermany

We present the development and characterization of a high-stability,multi-material,multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 *** tape surface position was measured to be stable on the sub-micrometre scale,compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers(>kHz).Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended *** target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team,with the exception of tape replacement,producing the largest data-set of relativistically intense laser–solid foil measurements to *** tape drive provides robust targetry for the generation and study of high-repetitionrate ion beams using next-generation high-power laser systems,also enabling wider applications of laser-driven proton sources.

关键词： high-repetition-rate laser target laser-plasma acceleration proton generation tape-drive target

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Intelligent scaling for 6G IoE services for resource provisioning

引用

PeerJ computer science 2021年 7卷 e755-e755页

作者： Alharbi, Abdullah Alyami, Hashem Poongodi, M. Rauf, Hafiz Tayyab Kadry, Seifedine Department of Information Technology College of Computers and Information Technology Taif University Taif Saudi Arabia Department of Computer Science College of Computers and Information Technology Taif University Taif Saudi Arabia College of Science and Engineering Hamad Bin Khalifa University Doha Qatar Department of Computer Science Faculty of Engineering & Informatics University of Bradford Bradford United Kingdom Faculty of Applied Computing and Technology Noroff University College Kristiansand Norway

The proposed research motivates the 6G cellular networking for the Internet of Everything’s (IoE) usage empowerment that is currently not compatible with 5G. For 6G, more innovative technological resources are required to be handled by Mobile Edge Computing (MEC). Although the demand for change in service from different sectors, the increase in IoE, the limitation of available computing resources of MEC, and intelligent resource solutions are getting much more significant. This research used IScaler, an effective model for intelligent service placement solutions and resource scaling. IScaler is considered to be made for MEC in Deep Reinforcement Learning (DRL). The paper has considered several requirements for making service placement decisions. The research also highlights several challenges geared by architectonics that submerge an Intelligent Scaling and Placement module. Subjects Algorithms and Analysis of Algorithms, Artificial Intelligence, Data Mining and Machine Learning, World Wide Web and Web science © Copyright 2021 Alharbi et al.

关键词： Internet of Everything

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Simple MATLAB-Based EDA for 5G Phased-Array Antenna Design

Simple MATLAB-Based EDA for 5G Phased-Array Antenna Design

引用

International RF and Microwave Conference, RFM

作者： Kok Yeow You Man Seng Sim Fandi Hamid Kim Yee Lee Ee Meng Cheng Fahmiruddin Esa Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Kajang Selangor Malaysia Faculty of Electronic Engineering Technology Universiti Malaysia Perlis Kampus Alam UniMAP Pauh Putra Arau Perlis Malaysia Department of Physics and Chemistry Faculty of Applied Science and Technology Pagoh Higher Education Hub Universiti Tun Hussein Onn Malaysia Panchor Malaysia

This paper presents electronic design automation (EDA) for microwave and millimeter-wave phased-array antenna using MATLAB GUI environment. Phased-array antenna was important for the fast-growing 5G wireless technologies due to it can be enhanced the antenna gain as well as control the beamforming of radiation patterns. In this paper, two types of phased-array antennas were simulated using a commercial EM simulator and their performance was compared to the calculated results from the developed EDA in order to evaluate its accuracy and reliability. The results between the calculation and simulation agree with each other.

关键词： Wireless communication Phased arrays Microwave antennas Microwave technology 5G mobile communication Horn antennas Simulation

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Effect of stencil wall aperture on solder paste release via stencil printing

Effect of stencil wall aperture on solder paste release via ...

引用

International Conference on Electronic and Advanced Materials 2021, ICEAM 2021

作者： Mohamed Sunar, M.S. Abu Bakar, M. Jalar, A. Che Ani, F. Ramli, M.R. Western Digital® SanDisk Storage Malaysia SDN.Bhd. Plot 301A Persiaran Cassia Selatan 1 Taman Perindustrian Batu Kawan MK13 Batu Kawan Seberang Perai Selatan Penang14100 Malaysia Institut of Microengineering and Nanoelectronics Universiti Kebangsaan Malaysia Bangi Selangor43600 Malaysia Department of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor43600 Malaysia

Solder paste printing is a process by which the correct amount of solder paste is applied to the printed circuit board via a stencil. The solder release from the stencil printing process very much depends on the type of solder paste and stencil conditions such as the shape of the aperture, size, and thickness of the stencil. This paper investigates the stencil condition in particular the stencil wall aperture and its relationship to the solder release ability. In this work, two types of stencil wall openings A and B were used, which differ in a different ways of cutting to achieve the wall aperture. The cutting process produced different surface roughness of the wall aperture of the stencil. Stencil printing was performed to print the solder paste onto the PCB pad. The release of solder paste was observed by solder paste inspection (SPI) and analyzed qualitatively and quantitatively. The results show that stencil B gives a better solder compared to stencil A. This is due to the smoother wall aperture compared to stencil A which has a roughened wall aperture. This shows that the performance of stencil printing in terms of solder printing quality is highly dependent on the surface roughness of the stencil aperture. Stencil quality is important as it affects the performance of solder paste printing, and this process is mainly carried out in the electronics industry. Therefore, understanding stencil conditions is important for electronic technology that uses solder printing. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.

关键词： Surface roughness

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N-Heterocyclic Carbenes - the Design Concept for Densely Packed and Thermally Ultra-Stable Aromatic Self-Assembled Monolayers

SSRN

引用

SSRN 2023年

作者： Cyganik, Piotr Wróbel, Mateusz Cegielka, Daria M. Asyuda, Andika Koziel, Krzysztof Zharnikov, Michael Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Smoluchowski Institute of Physics Lojasiewicza 11 Krakow30-348 Poland Jagiellonian University Doctoral School of Exact and Natural Sciences Lojasiewicza 11 Krakow30-348 Poland Angewandte Physikalische Chemie Universität Heidelberg Im Neuenheimer Feld 253 HeidelbergD-69120 Germany Faculty of Chemistry Jagiellonian University Gronostajowa 2 Krakow30-387 Poland

Self-assembled monolayers (SAMs) of N-heterocyclic carbenes (NHCs) on metal substrates are currently one of the most promising systems in context of molecular-scale engineering of surfaces and interfaces, crucial for numerous applications. Interest in NHC SAMs is mainly driven by their assumingly higher thermal stability compared to thiolate SAMs most broadly used at the moment. Most of the NHC SAMs utilize imidazolium as an anchoring group for linking molecules to the metal substrate via carbene C atom. It is well established in the literature that standing up and stable NHC SAMs are built only when using bulky side groups attached to nitrogen heteroatoms in imidazolium moiety, which, however, leads to monolayers exhibiting much lower packing density compared to thiolate SAMs. Here, by combined X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, and temperature-programmed secondary ion mass spectrometry analysis, we demonstrate that using NHCs with small methyl side groups in combination with simple solution-based preparation leads to the formation of aromatic monolayers exhibiting at least double surface density, upright molecular orientation, and ultra-high thermal stability compared to the NHC SAMs reported before. These parameters are crucial for most applications, including, in particular, molecular and organic electronics, where aromatic SAMs serve either as a passive element for electrode engineering or as an active part of organic field effect transistors and novel molecular electronics devices. © 2023, The Authors. All rights reserved.

关键词： Thermodynamic stability

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Magnetism in EuAlSi and the Eu1-xSrxAlSi Solid Solution

arXiv

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arXiv 2024年

作者： Walicka, Dorota I. Blacque, Olivier Gornicka, Karolina White, Jonathan S. Klimczuk, Tomasz von Rohr, Fabian O. Department of Quantum Matter Physics University of Geneva GenevaCH-1211 Switzerland Department of Chemistry University of Zurich ZurichCH-8057 Switzerland Laboratory for Neutron Scattering and Imaging PSI Center for Neutron and Muon Sciences PSI Villigen5232 Switzerland Faculty of Applied Physics and Mathematics Gdansk University of Technology Gdansk80-233 Poland Advanced Materials Center Gdansk University of Technology Gdansk80-233 Poland Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States

The magnetic properties of EuAlSi, a compound comprising a honeycomb lattice of Al/Si atoms and a triangular lattice of Eu atoms, are presented. By means of single-crystal X-ray diffraction we find that EuAlSi crystallizes in a AlB2-type structure with space group P6/mmm and unit cell parameters a = 4.2229(10) Å, and c = 4.5268(12) Å. Our magnetic measurements indicate that EuAlSi is a soft ferromagnetic material with TCurie = 25.8 K. The susceptibility follows the Curie-Weiss law at high temperatures, which allowed us to determine the paramagnetic Curie temperature θP = 36.1 K and an effective magnetic moment µeff = 8.0 µB/Eu. This value is in agreement with the theoretical value of 7.9 µB for Eu2+ free ion. Moreover, we have prepared the Eu1-xSrxAlSi solid solution, where the atoms in the triangular lattice were systematically exchanged, in order to study the evolution of the collective quantum properties from the ferromagnetic EuAlSi towards the superconducting SrAlSi. Across the Eu1-xSrxAlSi solid solution the unit cell parameters change linearly, following Vegard’s law, suggesting that the changes in physical properties are more likely intrinsic, what makes the system reliable for studying composition dependence of the interplay between the crystal structure and physical properties. As the Sr content increases, i.e. x increases, we note a consistent reduction of µeff and TCurie. Long-range magnetic order in Eu1-xSrxAlSi persists up to x = 0.95, whereas superconductivity is only observed for samples with x > 0.95. A possible quantum critical point is suggested to exist in the vicinity of to x ≈ 0.96, at which the suppression of ferromagnetic order is concomitant with the emergence of superconductivity. © 2024, CC BY.

关键词： Single crystals

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Mitigating the Massive Access Problem in the Internet of Things 1

引用

2nd International Symposium on Security in computer and Information sciences, EuroCybersec 2021

作者： Gelenbe, Erol Nakıp, Mert Marek, Dariusz Czachorski, Tadeusz Institute of Theoretical and Applied Informatics Polish Academy of Sciences Gliwice44-100 Poland Yaşar University Bornova İzmir Turkey CNRS Lab. I3S Université Côte d’Azur Nice France CNRS Lab. Abraham de Moivre London United Kingdom Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice44-100 Poland

ISBN: (数字)9783031093579

ISBN: (纸本)9783031093562

The traffic from the large number of IoT devices connected to the IoT is a source of congestion known as the Massive Access Problem (MAP), that results in packet losses, delays and missed deadlines for real-time data. This paper reviews the literature on MAP and summarizes recent results on two approaches that have been designed to mitigate MAP. One approach is based on randomizing the packet arrival instants to IoT gateways within a given time interval that is chosen so that packet arrivals do not exceed their deadlines, but also so that they do not constitute bulk arrivals. The second approach is a novel traffic shaping policy named the Quasi-Deterministic-Transmission-Policy (QDTP) which has been proved to drastically reduce queue formation at the receiving gateway by delaying packet departures from the IoT devices in a judicious manner. Both analytical and experimental results are summarized, that describe the benefits of these techniques. © 2022, The Author(s).

关键词： Internet of things

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Enhancing Quantum Support Vector Machines through Variational Kernel Training

arXiv

引用

arXiv 2023年

作者： Innan, Nouhaila Khan, Muhammad Al-Zafar Panda, Biswaranjan Bennai, Mohamed Quantum Physics and Magnetism Team LPMC Faculty of Sciences Ben M’sick Hassan II University of Casablanca Morocco Zaiku Group Ltd Liverpool United Kingdom School of Computer Science and Applied Mathematics University of the Witwatersrand 1 Jan Smuts Ave Braamfontein Gauteng Johannesburg2000 South Africa Odisha Berhampur India Lab of High Energy Physics Modeling and Simulations Faculty of Sciences University Mohammed V-Agdal Rabat Morocco

Quantum machine learning (QML) has witnessed immense progress recently, with quantum support vector machines (QSVMs) emerging as a promising model. This paper focuses on the two existing QSVM methods: quantum kernel SVM (QK-SVM) and quantum variational SVM (QV-SVM). While both have yielded impressive results, we present a novel approach that synergizes the strengths of QK-SVM and QV-SVM to enhance accuracy. Our proposed model, quantum variational kernel SVM (QVK-SVM), leverages the quantum kernel and quantum variational algorithm. We conducted extensive experiments on the Iris dataset and observed that QVK-SVM outperforms both existing models in terms of accuracy, loss, and confusion matrix indicators. Our results demonstrate that QVK-SVM holds tremendous potential as a reliable and transformative tool for QML applications. Hence, we recommend its adoption in future QML research endeavors. © 2023, CC BY.

关键词： Support vector machines

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Distributed Feedback Laser (DFB) for Signal Power Amplitude Level Improvement in Long Spectral Band

引用

Journal of Optical Communications 2023年第S1期44卷 S125-S130页

作者： Samanta, Debabrata Sivaram, M. Rashed, Ahmed Nabih Zaki Boopathi, C.S. Amiri, I.S. Yupapin, P. Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam Bangalore Bangalore India Department of Computer Networking Lebanese French University Kurdistan Region Erbil Iraq Electronics and Electrical Communications Engineering Department Faculty of Electronic Engineering Menoufia University Menouf32951 Egypt Department of EEE SRM Institute of Science and Technology Chennai India

This study outlines the distributed feedback laser for signal power amplitude level improvement in the long spectral band of 1550 nm wavelength within supporting pumped wavelength of 1480 nm. The bias and modulation peak currents based distributed feedback laser are varied in order to test the signal power level, peak signal amplitude variations after the fiber-optic channel and light detectors. The signal power level, peak signal amplitude is measured against spectral wavelength and time bit period variations. The study emphasis the signal power level, peak signal amplitude are enhanced for the best selection values of both a bias current at 45 mA and modulation peak current at 0.5 mA. © 2023 Walter de Gruyter GmbH. All rights reserved.

关键词： Distributed feedback lasers

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(g − 2)e,µ anomalies and decays h, Z → ebea in 3-3-1 models with inverse seesaw neutrinos

arXiv

引用

arXiv 2024年

作者： Hong, T.T. Phuong, L.T.T. Nguyen, T. Phong Nha, N.H.T. Hue, L.T. An Giang University Long Xuyen City880000 Viet Nam Vietnam National University Ho Chi Minh City700000 Viet Nam Department of Physics Can Tho University 3/2 Street Ninh Kieu Can Tho City94000 Viet Nam Subatomic Physics Research Group Science and Technology Advanced Institute Van Lang University Ho Chi Minh City Viet Nam Faculty of Applied Technology School of Technology Van Lang University Ho Chi Minh City Viet Nam

The lepton flavor violating (LFV) decays h, Z → ebea, and eb → eaγ are discussed in a class of general 3-3-1 models adding heavy neutral leptons and singly charged Higgs bosons to accommodate experimental data of neutrino oscillation and (g − 2)ea anomalies of charged leptons through the inverse seesaw mechanism. We show that the models with the minimal number of inverse seesaw neutrinos cannot reach the 1σ range of (g − 2)µ data due to the experimental upper bounds on decay rates of (τ → µγ) and (µ → eγ). Features of LFV decays are presented in detail, focusing on the regions of parameter space satisfying the 1σ ranges of (g − 2)e,µ data. © 2024, CC0.

关键词： Neutrons

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