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12th International Electrical Engineering Congress, iEECON 2024

作者： Sangpet, Patchadaporn Thaiwirot, Wanwisa Akkaraekthalin, Prayoot Chudpooti, Nonchanutt King Mongkut's University Of Technology North Bangkok Bangkok Faculty Of Engineering Department Of Electrical And Computer Engineering Bangkok Thailand King Mongkut's University Of Technology North Bangkok Bangkok Faculty Of Applied Science Department Of Industrial Physics And Medical Instrumentation Bangkok Thailand

ISBN: (纸本)9798350383591

The paper presents the rotated 3D-printed dielectric lens assembly with an ultra-wideband (UWB) antenna for use in the beam-steering applications. The focus is on achieving beam steering by combining the rotated 3D-printed dielectric lens assembly with a hemispherical lens and UWB antenna. The UWB antenna is fabricated on an FR-4 substrate, while the hemispherical lens and the rotated 3D-printed lens assembly are made from Acrylonitrile Butadiene Styrene (ABS). To enable the hemispherical lens to rotate to the specified angle, a set of rotatable 3D-printed lenses was etched to determine five angles: -60degrees, -30degrees, 0degrees, 30degrees, and 60degrees. Both simulation and measurement results indicate that at a beginning frequency of 3.5 GHz, the beam cannot be steered when using the UWB antenna with the 3D-printed ABS lens rotated hemispherical lens assembly. However, at middle and high frequencies of 7.0 GHz and 10.0 GHz, respectively, the beam can be steered according to the direction of rotation of the hemispherical lens. © 2024 IEEE.

关键词： Microstrip antennas

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Time-Variant Vector Field Visualization for Magnetic Fields of Neutron Star Simulation

SSRN

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SSRN 2024年

作者： Lieb, Simon Janez Cook, William Hombeck, Jan Bernuzzi, Sebastiano Lawonn, Kai Friedrich-Schiller-University Jena Faculty of Mathematics and Computer Science Germany Friedrich-Schiller-University Jena Faculty of Physics and Astronomy Germany

We present a novel visualization application designed to explore time-dependent development of magnetic fields of neutron stars. The strongest magnetic fields in the universe can be found within neutron stars, potentially playing a role in initiating astrophysical jets and facilitating the outflow of neutron-rich matter, ultimately resulting in the production of heavy elements during binary neutron star mergers. Since such effects may be dependent on the strength and configuration of the magnetic field, the formation and parameters of such fields is part of current research in astrophysics. Magnetic fields are investigated using simulations in which various initial configurations are tested. However, the long term configuration is an open question and current simulations do not achieve a stable magnetic field. Neutron star simulations produce data quantities in the range of several terabytes, which are both spatially in 3D and temporally resolved. Our tool enables physicists to interactively explore the generated data. We first convert the data in a pre-processing step and then we combine sparse vector field visualization using streamlines with dense vector field visualization using line integral convolution. We provide several methods to interact with the data responsively. This allows the user to intuitively investigate data-specific issues. Furthermore, diverse visualization techniques facilitate individual exploration of the data and enable real-time processing of specific domain tasks, like the investigation of the time-dependent evolution of the magnetic field. In a qualitative study, domain experts tested the tool and the usability was queried. Domain experts rated the tool very positively and suggest it in their daily work. © 2024, The Authors. All rights reserved.

关键词： Data visualization

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Advancing Manuscript Metadata: Work in Progress at the Jagiellonian University

arXiv

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arXiv 2024年

作者： do Valle Miranda, Luiz Kutt, Krzysztof Nalepa, Grzegorz J. Jagiellonian Human-Centered AI Lab Mark Kac Center for Complex Systems Research Institute of Applied Computer Science Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland

As part of ongoing research projects, three Jagiellonian University units—the Jagiellonian University Museum, the Jagiellonian University Archives, and the Jagiellonian Library—are collaborating to digitize cultural heritage documents, describe them in detail, and then integrate these descriptions into a linked data cloud. Achieving this goal requires, as a first step, the development of a metadata model that, on the one hand, complies with existing standards, on the other hand, allows interoperability with other systems, and on the third, captures all the elements of description established by the curators of the collections. In this paper, we present a report on the current status of the work, in which we outline the most important requirements for the data model under development and then make a detailed comparison with the two standards that are the most relevant from the point of view of collections: Europeana Data Model used in Europeana and Encoded Archival Description used in Kalliope. Copyright © 2024, The Authors. All rights reserved.

关键词： Metadata

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Optimization of light-by-light triggers from 2022 pilot lead-lead run in ATLAS 11

Optimization of light-by-light triggers from 2022 pilot lead...

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11th Annual Conference on Large Hadron Collider physics, LHCP 2023

作者： Domijan, Karolina AGH University of Kraków al. Adama Mickiewicza 30 Kraków30-059 Poland Faculty of Physics and Applied Computer Science AGH ul. Reymonta 19 Kraków30-059 Poland

Light-by-light scattering (LbyL, γγ → γγ) is a very rare and interesting phenomenon, impossible to measure in standard hadronic lead-lead collisions. Its final state consists of a low-energetic pair of photons with the absence of any other activity in the detector. These di-photon events proved to be a powerful tool for new physics searches involving axion-like particles. A new large sample of lead-lead data is collected in the fall of 2023 as part of Run-3 operations at the LHC. It will provide access to more exclusive events including the LbyL process. Trigger preparations are an important aspect of each data-taking campaign. In particular, small rates of the LbyL process in comparison with the huge activity in the detector from other processes imply the development of special triggering techniques. In this document, some ideas for efficient triggering of events with low-pT electrons and photons are discussed. The first approach involves studies with a dedicated set of triggers deployed in the lead-lead pilot run recorded in November 2022 by the ATLAS experiment. In particular, the estimation of the trigger efficiency for selections based on the hardware-level trigger (so-called level 1) from the pilot run is discussed. © Copyright owned by the author(s).

关键词： Photons

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PLOD: Point cloud level of detail for polygon mesh 32

PLOD: Point cloud level of detail for polygon mesh

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32nd International Conference in Central Europe on computer Graphics, Visualization and computer Vision, WSCG 2024

作者： Konks, Eric Shcherbakov, Alexandr Phystech School of Applied Mathematics and Computer Science Moscow Institute of Physics and Technology Institutskiy Pereulok 9 Dolgoprudny Oblast Moscow141701 Russia Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University Moscow119991 Russia

Rendering high-polygonal models from distant perspectives has certain performance issues related to high density of subpixel triangles, which can be solved by levels of detail, a classical optimization method. Since a mesh occupies a small area on the screen, an alternative representation of the geometry in the form of a point cloud can replace the original geometry with little or no change to the image, and allowing for significant performance improvements due to the smaller number of primitives rendered. This paper presents a method for automatically generating a point cloud from a polygonal mesh with nested levels of detail. It also considers a method for rendering cloud with dynamically varying cloud density in real time based on view frustum and distance. © 2024 University of West Bohemia. All rights reserved.

关键词： Mesh generation

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Titania coating formation on hydrostatically extruded pure titanium by micro-arc oxidation method

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Journal of Materials science & Technology 2022年第16期111卷 224-235页

作者： Ł.Maj D.Wojtas A.Jarz˛ebska M.Bieda K.Trembecka-Wójciga R.Chulist W.Kozioł A.Góral A.Trelka K.Janus J.Kawałko M.Kulczyk F.Muhaffel H.Çimeno˘glu K.Sztwiertnia Institute of Metallurgy and Materials Science Polish Academy of SciencesReymonta 25Krakow 30-059Poland Faculty of Physics and Applied Computer Science AGH University of Science and TechnologyKrakowPoland Academic Centre of Materials and Nanotechnology AGH University of Science and TechnologyKrakowPoland Institute of High Pressure Physics Polish Academy of SciencesWarsawPoland Department of Metallurgical and Materials Engineering Istanbul Technical UniversityIstanbulTurkey

In this work,the microstructure of titania coating fabricated on the surface of hydrostatically extruded titanium grade 4 with the use of the micro-arc oxidation method was *** surface topography and microstructure investigations performed with atomic force microscopy and scanning and transmission electron microscopy revealed that,by using an Na_(2)HPO_(4)electrolyte,a well-adherent porous coating is produced on the top surface and side walls of the extruded *** distribution of chemical elements was analyzed by using energy dispersive X-ray *** chemical elements dissolved in the electrolyte(Na,P and O)incorporated into the *** locates preferentially in the outer part of the coating,while phosphorus and oxygen are distributed throughout the whole *** most relevant finding shows that a grain refinement caused by a hydrostatic extrusion provoked an increase in density of high-angle grain boundaries(HAGB),which in turn secured the formation of a continuous amorphous layer close to the *** presence of this layer compensates for the effect of anisotropic substrate,producing a comparable and homogenous microstructure with a large number of micropores.

关键词： Micro-arc oxidation Titanium of commercial purity Hydrostatic extrusion Surface topography Microstructure

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Pathway for Unraveling Chemical Composition Effects of Metal-Organic Precursors for FIBID Applications

arXiv

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arXiv 2024年

作者： Jany, B.R. Madajska, K. Butrymowicz-Kubiak, A. Krok, F. Szymańska, I.B. Marian Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Krakow30348 Poland Faculty of Chemistry Nicolaus Copernicus University in Toruń Gagarina 7 Toruń87-100 Poland

The development of modern metal deposition techniques like Focused Ion/Electron Beam Induced Deposition FIBID/FEBID relies heavily on the availability of metal-organic precursors of particular properties. To create a new precursor, extensive testing under specialized gas injection systems is required along with time-consuming and costly chemical analysis typically conducted using scanning electron microscopes. This process can be quite challenging due to its complexity and expense. Here, we present a method for investigating the chemical composition effects of new metal-organic precursors, prepared in form of supported thick layers, used in FIBID/FEBID applications by utilizing achievable SEM BSE/EDX analysis along with Machine Learning data processing techniques. This approach enables a comprehensive fast examination of decomposition processes during FIBID, providing valuable insights into how these chemical composition effects impact the final properties of metallic deposits. Our method can be employed to optimize, prescreen, and score new potential precursors for FIBID applications by significantly reducing the time required and conserving valuable resources. Our finding brings also new perspectives across diverse areas of nanoscience in particularly enhancing strongly the field of metal structures nanofabrication. Copyright © 2024, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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Electron and neutrino scattering off the deuteron in a relativistic framework

引用

Physical Review C 2023年第2期107卷 024617-024617页

作者： A. Grassi J. Golak W. N. Polyzou R. Skibiński H. Witała H. Kamada M. Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University PL-30348 Kraków Poland Department of Physics and Astronomy The University of Iowa Iowa City Iowa 52242 USA Department of Physics Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan

We build a relativistic model to perform calculations of exclusive, semiexclusive, and inclusive unpolarized cross sections and various polarization observables in electron and neutrino scattering experiments with deuteron targets. The strong interaction dynamics is defined by an explicit dynamical unitary representation of the Poincaré group, where representations of space translations and rotations in the interacting and noninteracting representations are the same. The Argonne V18 potential is used to construct a relativistic nucleon-nucleon interaction reproducing the experimental deuteron binding energy and nucleon-nucleon scattering observables. Our formalism does not include the pion production channel and neglects two-body contributions in the electromagnetic as well as in the weak nuclear current operator. We show that it is applicable to processes at kinematics, where the internal two-nucleon energy remains below the pion production threshold but the magnitude of the three-momentum transfer extends at least to several GeV.

关键词： Electroweak interactions in nuclear physics Nuclear reactions Polarization phenomena Special relativity Few-body systems

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Free-electron crystals for enhanced X-ray radiation

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Light(science & Applications) 2024年第7期13卷 1299-1309页

作者： Lee Wei Wesley Wong Xihang Shi Aviv Karnieli Jeremy Lim Suraj Kumar Sergio Carbajo Ido Kaminer Liang Jie Wong School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore. Solid State Institute and Faculty of Electrical and Computer Engineering Technion–Israel Institute of TechnologyHaifa 3200003Israel. School of Electrical Engineering Fleischman Faculty of EngineeringTel Aviv UniversityTel Aviv 69978Israel Department of Applied Physics Stanford UniversityStanfordCA 94305USA. Science Mathematics and TechnologySingapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore. Electrical and Computer Engineering Department UCLA420 WestwoodLos AngelesCA 90095USA. Physics and Astronomy Department UCLA475 Portola PlazaLos AngelesCA 90095USA. SLAC National Accelerator Laboratory Stanford University2575 Sand Hill RoadMenlo ParkCA 94025USA

Bremsstrahlung—the spontaneous emission of broadband radiation from free electrons that are deflected by atomic nuclei—contributes to the majority of X-rays emitted from X-ray tubes and used in applications ranging from medical imaging to semiconductor chip ***,we show that the bremsstrahlung intensity can be enhanced significantly—by more than three orders of magnitude—through shaping the electron wavefunction to periodically overlap with atoms in crystalline ***,we show how to shape the bremsstrahlung X-ray emission pattern into arbitrary angular emission profiles for purposes such as unidirectionality and ***,we find that these enhancements and shaped emission profiles cannot be attributed solely to the spatial overlap between the electron probability distribution and the atomic centers,as predicted by the paraxial and nonrecoil theory for free electron light *** work highlights an unprecedented regime of free electron light emission where electron waveshaping provides multi-dimensional control over practical radiation processes like *** results pave the way towards greater versatility in table-top X-ray sources and improved fundamental understanding of quantum electron-light interactions.

关键词： overlap attributed arbitrary

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Imprints of primordial gravitational waves with non-Bunch-Davies initial states on CMB bispectra

arXiv

引用

arXiv 2023年

作者： Akama, Shingo Tahara, Hiroaki W.H. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow30-348 Poland Department of Physics Rikkyo University Toshima Tokyo171-8501 Japan

It has been shown that both scalar and tensor modes with non-Bunch-Davies initial states can enhance the amplitudes of the primordial bispectra compared to those with the Bunch-Davies state, especially for wavenumber modes in a flattened triangle configuration. However, in the case of the non-Bunch-Davies scalar modes, it has also been found that those enhancements in Fourier space are somewhat reduced in bispectra of cosmic microwave background (CMB) fluctuations. In this paper, we show that the enhancement resulting from the tensor modes is partially reduced to a degree differing from that of the scalar modes, which makes the non-Bunch-Davies effects unobservable in gravitational theories with the same quadratic and cubic operators of the tensor perturbations as general relativity. Furthermore, we present examples of gravitational theories yielding enhancements that would potentially be detected through CMB experiments. Copyright © 2023, The Authors. All rights reserved.

关键词： Tensors

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