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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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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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physics Beyond the Standard Model with the J-PET detector

Physics Beyond the Standard Model with the J-PET detector

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2021 European Physical Society Conference on High Energy physics, EPS-HEP 2021

作者： del Río, Elena Pérez Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University S. Lojasiewicza 11 Kraków30-348 Poland

The Positronium (Ps) system, a bound state of an electron and a positron, is suitable for testing the predictions of quantum electrodynamics (QED), since its properties can be perturbatively calculated to high accuracy and, unlike the hydrogen system, is not affected by finite size or QCD effects at the current experimental precision level. This makes the Ps atom a good laboratory to test the Fundamental Symmetries of physics and also search for new particles not included in the Standard Model (SM) of physics. On one hand, time reversal (T) and CP symmetry violation have never been observed in pure leptonic systems like the Ps atom, and the current experimental limits for CP and CPT violation in the decays of Ps is currently set at the level of 10−3, while for C violation are at the level of 10−7. These limits are still six and two orders of magnitude lower than the expected precision of 10−9 set by photon-photon interactions. Secondly, experiments searching for invisible decays of the Ps triplet state, the ortho-Positronium (o-Ps), which mainly decays to three photons, are being conducted, since they are sensitive to new physics scenarios, e.g. Mirror Matter (MM), a suitable Dark Matter candidate, proposed to restore parity (P) violation. By performing a high precision measurement of the o-Ps lifetime, the accuracy of the present QED calculations can be tested and a search for the invisible decays of the o-Ps can be performed. These studies are conducted with the novel total-body Positron-Electron Tomograph (PET) scanner at the Jagiellonian University. The J-PET is a large and high precise medical imaging tool, based on the plastic scintillators. It is a high acceptance multi-purpose detector optimized for the detection of photons from positron-electron annihilation and can be used in a broad scope of interdisciplinary investigation, e.g. medical imaging, life-time measurements, quantum entanglement studies with o-Ps, and tests of discrete symmetries. © Copyright o

关键词： Positrons

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The liberation set in the inverse eigenvalue problem of a graph

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arXiv 2023年第1期675卷 1-28页

作者： Lin, Jephian C.-H. Oblak, Polona Šmigoc, Helena Department of Applied Mathematics National Sun Yat-sen University Kaohsiung80424 Taiwan Faculty of Computer and Information Science University of Ljubljana Večna pot 113 LjubljanaSI-1000 Slovenia Faculty of Mathematics and Physics University of Ljubljana Institute of Mathematics Physics and Mechanics Jadranska ulica 19 Ljubljana1000 Slovenia School of Mathematics and Statistics University College Dublin BelfieldDublin 4 Ireland

The inverse eigenvalue problem of a graph G is the problem of characterizing all lists of eigenvalues of real symmetric matrices whose off-diagonal pattern is prescribed by the adjacencies of G. The strong spectral property is a powerful tool in this problem, which identifies matrices whose entries can be perturbed while controlling the pattern and preserving the eigenvalues. The Matrix Liberation Lemma introduced by Barrett et al. in 2020 advances the notion to a more general setting. In this paper we revisit the Matrix Liberation Lemma and prove an equivalent statement, that reduces some of the technical difficulties in applying the result. We test our method on matrices of the form M = AB and show how this new approach supplements the results that can be obtained from the strong spectral property only. While extending this notion to the direct sums of graphs, we discover a surprising connection with the zero forcing game on Cartesian products of graphs. Throughout the paper we apply our results to resolve a selection of open cases for the inverse eigenvalue problem of a graph on six *** Codes 05C50, 15A18, 15B57, 65F18 © 2023, CC BY-SA.

关键词： Matrix algebra

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PROBING GLUON SATURATION IN PHOTON+JET PRODUCTION IN pp AND pPb COLLISIONS

Acta Physica Polonica B, Proceedings Supplement

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Acta Physica Polonica B, Proceedings Supplement 2024年第5期17卷

作者： Ganguli, Ishita Kotko, Piotr AGH University of Krakow Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

We study photon+jet production in proton–proton and proton–lead collisions using the small-x Improved Transverse Momentum Dependent (ITMD) factorization framework in KaTie. The ITMD factorization framework, rooted in the Color Glass Condensate (CGC) theory (and for this particular process essentially identical to it), proves particularly useful at probing particle production at relatively large transverse momenta remaining at the same time sensitive to saturation effects in transverse momentum dependent (TMD) gluon distributions. Our investigation focuses on the azimuthal correlations and few other observables across a spectrum of center-of-mass energies. The comprehensive exploration of these observables leads to a deeper understanding of the underlying dynamics of gluons in the saturation domain. © 2024 Jagiellonian University. All rights reserved.

关键词： Factorization

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Acoustic cavitation bubble under influence of frequency ultrasound: Numerical analysis 3

Acoustic cavitation bubble under influence of frequency ultr...

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3rd IEEE International Conference on Electronic Engineering, ICEEM 2023

作者： Abu-Nab, A.K. Abu-Bakr, A.F. Abushaeer, Zain Menoufia University Faculty of Science Department of Mathematics and Computer Science Shebin El-Koom32511 Egypt Moscow Institute of Physics and Technology Phystech School of Applied Mathematics and Informatics Moscow141700 Russia Menoufia University Faculty of Science Department of Mathematics and Computer Science Shebin El-Koom32511 Egypt Higher Institute of Engineering and Technology Department of Basic Science Kafrelsheikh33511 Egypt

ISBN: (纸本)9798350323511

This work presents a numerical investigation of acoustic cavitation in Newtonian fluid based on frequency ultrasound. The model of ultrasonic cavitation dynamics is formulated by a modified Rayleigh-Plesset equation and an acoustic pressure equation. The exponential B-Spline collection method was employed to obtain the numerical solutions of the given cavitation bubble model, considering the effect of acoustic pressure. The behaviour of the cavitation microbubbles' radius and the internal pressure of acoustic cavitation were examined at different values of frequencies. The obtained results reveal the importance of frequencies in ultrasound, which play a vital role in changing the behaviour of cavitation bubbles. © 2023 IEEE.

关键词： Numerical methods

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Energy Management Strategy with a Hybrid Renewable Energy System for a Standalone House

Energy Management Strategy with a Hybrid Renewable Energy Sy...

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International Conference on applied and Theoretical Electricity (ICATE)

作者： Laurentiu-Alex Mustaţă Gheorghe-Dan Sorea Elena Helerea Electrical Engineering and Applied Physics Department Electrical Engineering and Computer Science Faculty Transilvania University Brasov Romania

ISBN: (数字)9798350388107

ISBN: (纸本)9798350388114

In the case of standalone houses, ensuring a continuous and regulated power supply from renewable sources is crucial. To address their unpredictable nature, an environmentally conscious hybrid renewable energy system combining photovoltaic panels, a battery, and a Diesel generator is considered. A software application simulates the power flow in a standalone house with common AC loads, analysing summer and winter scenarios over 24 hours. The strategy employed provides an optimal energy management by using the Diesel generator only during peak demand when PV is available and to cover loads and maintain battery life when PV is not in operation. The simulation results provide valuable insights for designing such hybrid energy systems and for enhancing system responsiveness to dynamic energy demands.

关键词： Photovoltaic systems Renewable energy sources Costs Power system dynamics Generators Hybrid power systems Batteries Energy management Optimization Load flow

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Charge density wave, enhanced mobility, and large nonsaturating magnetoresistance across the magnetic states of HoNiC2 and ErNiC2

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Physical Review B 2024年第7期109卷 075154-075154页

作者： Kamil K. Kolincio Marta Roman Fabian Garmroudi Michael Parzer Ernst Bauer Herwig Michor Faculty of Applied Physics and Mathematics Gdansk University of Technology Narutowicza 11/12 80-233 Gdansk Poland Institute of Solid State Physics TU Wien Wiedner Hauptstrasse 8–10 A-1040 Wien Austria Institute of Physics and Applied Computer Science Faculty of Applied Physics and Mathematics and Advanced Materials Center Gdansk University of Technology Narutowicza 11/12 80-233 Gdansk Poland

We report on magnetotransport and thermoelectric properties of two ternary carbides HoNiC2 and ErNiC2 hosting both charge density wave and long-range magnetic order. In the charge density wave state, both compounds show relatively large magnetoresistance MR ≈ 150% in HoNiC2 and ≈70% in ErNiC2 at a magnetic field of 9 T and temperature as low as 2 K. This positive field-linear magnetoresistance shows no signatures of saturation. Our combined analysis of diagonal and off-diagonal transport responses reveals electronic mobility values on the order of 103cm2V−1s−1 at 2 K. Both the elevated mobility and related enhanced magnetoresistance persist in the zero-field antiferromagnetic ground state and survive the field-induced crossovers through metamagnetic to field-aligned ferromagnetic states. The robustness of the high-mobility Fermi surface pockets across the magnetically ordered states suggests that the charge density wave is not suppressed but coexists with long-range magnetism in the entire dome of the magnetically ordered states.

关键词： Antiferromagnetism Charge density waves Ferromagnetism Hall effect Magnetism Magnetoresistance Magnetotransport Metamagnetism Nesting Peierls transition Thermopower Antiferromagnets Ferromagnets Metals Polycrystalline materials Strongly correlated systems Hall bar Resistivity measurements Transport techniques

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A new class of distances on complex projective spaces

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Linear Algebra and Its Applications 2025年 721卷 577-611页

作者： Bistroń, Rafal Eckstein, Michal Friedland, Shmuel Miller, Tomasz Życzkowski, Karol Institute of Theoretical Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. prof. Stanislawa Lojasiewicza 11 Krakow30-348 Poland Doctoral School of Exact and Natural Sciences Jagiellonian University ul. prof. Stanislawa Lojasiewicza 11 Krakow30-348 Poland Department of Mathematics Statistics and Computer Science University of Illinois at Chicago 851 S. Morgan Street ChicagoIL60607-7045 United States Copernicus Center for Interdisciplinary Studies Jagiellonian University ul. Mikolaja Kopernika 27 Krakow31-501 Poland Center for Theoretical Physics Polish Academy of Science aleja Lotników 32/46 Warsaw02-668 Poland

The complex projective space P(Cn) can be interpreted as the space of all quantum pure states of size n. A distance on this space, interesting from the perspective of quantum physics, can be induced from a classical distance defined on the n-point probability simplex by the ‘earth mover problem’. We show that this construction leads to a quantity satisfying the triangle inequality, which yields a true distance on complex projective space belonging to the family of quantum 2-Wasserstein distances. © 2024 Elsevier Inc.

关键词： State space methods

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On the Uncrossed Number of Graphs 32

On the Uncrossed Number of Graphs

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32nd International Symposium on Graph Drawing and Network Visualization, GD 2024

作者： Balko, Martin Hliněný, Petr Masařík, Tomáš Orthaber, Joachim Vogtenhuber, Birgit Wagner, Mirko H. Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic Faculty of Informatics Masaryk University Brno Czech Republic Institute of Informatics Faculty of Mathematics Informatics and Mechanics University of Warsaw Poland Institute of Software Technology Graz University of Technology Austria Institute of Computer Science Osnabrück University Germany

ISBN: (纸本)9783959773430

Visualizing a graph G in the plane nicely, for example, without crossings, is unfortunately not always possible. To address this problem, Masařík and Hliněný [GD 2023] recently asked for each edge of G to be drawn without crossings while allowing multiple different drawings of G. More formally, a collection D of drawings of G is uncrossed if, for each edge e of G, there is a drawing in D such that e is uncrossed. The uncrossed number unc(G) of G is then the minimum number of drawings in some uncrossed collection of G. No exact values of the uncrossed numbers have been determined yet, not even for simple graph classes. In this paper, we provide the exact values for uncrossed numbers of complete and complete bipartite graphs, partly confirming and partly refuting a conjecture posed by Hliněný and Masařík [GD 2023]. We also present a strong general lower bound on unc(G) in terms of the number of vertices and edges of G. Moreover, we prove NP-hardness of the related problem of determining the edge crossing number of a graph G, which is the smallest number of edges of G taken over all drawings of G that participate in a crossing. This problem was posed as open by Schaefer in his book [Crossing Numbers of Graphs 2018]. © Martin Balko, Petr Hliněný, Tomáš Masařík, Joachim Orthaber, Birgit Vogtenhuber, and Mirko H. Wagner.

关键词： Graph theory

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