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15th International Conference on Parallel Processing and applied Mathematics, PPAM 2024

作者： Borowiec, Mateusz Gwizdalla, Tomasz Maślanka, Pawel Faculty of Physics and Applied Informatics University of Lódź Pomorska 149/153 Lódź90-236 Poland

ISBN: (纸本)9783031857027

Different processes related to the phenomena of interaction across communities are of particular interest, especially since the beginning of the current century. It concerns such processes as disease spreading, opinion distribution, and formation or recommendation systems. The last two are of particular interest in the rapid development of social networks. In our paper, we will present the proposition of the update scheme intended to describe the process of opinion change in continuous space. We show it for the 2D opinion space following Nolan’s idea of multidimensional opinion presentation. We implement our mechanism for different types of networks and different parameters. The paper shows that similarities exist between the networks with longer tails of node degree distribution, and we can observe the emergence of two groups around two different points in the space. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： opinion formation scale-free networks social networks

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An isospectral transformation between Hessenberg–bidiagonal matrix pencils and Hessenberg matrices without using subtraction

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Linear Algebra and Its Applications 2025年 720卷 272-302页

作者： Kobayashi, Katsuki Maeda, Kazuki Tsujimoto, Satoshi Department of Applied Mathematics and Physics of Informatics Kyoto University Yoshida-Honmachi Kyoto606-8501 Japan Faculty of Informatics University of Fukuchiyama 3370 Hori Kyoto Fukuchiyama620-0886 Japan

We introduce an eigenvalue-preserving transformation algorithm from the generalized eigenvalue problem by matrix pencil of the upper and the lower bidiagonal matrices into a standard eigenvalue problem while preserving sparsity, using the theory of orthogonal polynomials. The procedure is formulated without subtraction, which causes numerical instability. Furthermore, the algorithm is discussed for the extended case where the upper bidiagonal matrix is of Hessenberg type. © 2025 Elsevier Inc.

关键词： Eigenvalues and eigenfunctions

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Effect of process parameters on properties of Mn1.5CuFe0.5O4 spinel oxide coatings deposited by spray pyrolysis method

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International Journal of Hydrogen Energy 2025年 130卷 213-229页

作者： Mehdizade, Maryam Smeacetto, Federico Winiarski, Michal Molin, Sebastian Advanced Materials Center Faculty of Electronics Telecommunications and Informatics Gdansk University of Technology Gdansk Poland Department of Applied Science and Technology Polytechnic di Torino Italy Applied Physics and Mathematics and Advanced Materials Center Gdansk University of Technology Gdansk Poland

One of the critical issues in the lifetime of metallic interconnects is related to their high oxidation rate and Cr diffusion, which negatively affect their performance. In the present study, a novel Fe modified Mn–Cu spinel oxide with the chemical composition of Mn1.5CuFe0.5O4 as protective coating was deposited on the surface of Crofer 22 APU and alumina by the spray pyrolysis method. The effects of different deposition conditions including deposition temperature, spraying speed, and volume of precursor on the properties of deposited spinel coatings were investigated. Scanning electron microscopy characterizations showed that the deposited layer was uniform and non-cracked at the deposition temperature of 400 °C. However, at temperatures of 300 °C and lower, the deposited layers became non-uniform and cracked. Additionally, spraying with speeds of 10 ml/h and lower resulted in uniform and non-cracked coatings, and a higher spraying speed of 15 ml/h caused a nonuniform and cracked layer. Atomic force microscopy measurements proposed that the value of Ra was reduced by increasing the deposition temperature and reducing the spraying speed. X-ray diffraction characterization showed that deposition temperature has affected the phase structure of deposited spinel oxides on both substrates. According to electrical conductivity measurements, deposited layers at higher deposition temperatures with lower spraying speeds showed higher electrical conductivity and lower activation energy. Decreasing the deposition temperature reduced the electrical conductivity of the spinel oxide coatings. © 2025 The Authors

关键词： Spray pyrolysis

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Environmental drivers of the allergenic load caused by Ambrosia artemisiifolia pollen and its major allergen Amb a 1 in the atmosphere

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International Journal of Biometeorology 2025年 1-14页

作者： Ščevková, Jana Žilka, Matúš Dušička, Jozef Vašková, Zuzana Kováč, Jozef Zahradníková, Eva Faculty of Natural Sciences Department of Botany Comenius University Révová 39 Bratislava 81102 Slovakia Faculty of Mathematics Physics and Informatics Department of Applied Mathematics and Statistics Comenius University Mlynská dolina Bratislava 84248 Slovakia

Understanding the environmental factors influencing the allergenicity of Ambrosia artemisiifolia pollen is crucial for effective allergy prevention. This study, conducted from 2019 to 2022 in Bratislava, Slovakia, utilised a Hirst-type Burkard pollen trap and a Burkard multi-vial cyclone sampler to measure airborne ragweed pollen (by microscopic analysis) and Amb a 1 allergen concentrations (by ELISA), enabling the calculation of pollen allergen potency (PAP). The data analysis showed that annual pollen and allergen levels are affected by meteorological conditions: sunny and dry weather in May accelerated pollen production, while dry conditions in August increased allergenic potency during the main flowering phase. Based on Spearman’s correlation analysis, daily allergen levels were significantly associated with pollen concentrations. Regression analysis confirmed the influence of environmental factors on pollen, allergen and PAP levels. Pollen concentration showed a positive association with temperature and wind speed but a negative association with precipitation. Relative humidity was the only meteorological factor negatively linked to allergen levels, while temperature had a negative impact on PAP. The most relevant air pollutants were CO and SO₂, which increased allergen levels and PAP, respectively. © The Author(s) 2025.

关键词： Air pollutants Amb a 1 allergen ELISA Meteorological parameters Pollen allergen potency Ragweed pollen

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Novel Aspects of Neutrino Oscillations 42

Novel Aspects of Neutrino Oscillations

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42nd International Conference on High Energy physics, ICHEP 2024

作者： Šimkovic, Fedor Faculty of Physics Mathematics and Informatics Comenius University in Bratislava Mlynská dolina F1 BratislavaSK842 48 Slovakia Institute of Experimental and Applied Physics Czech Technical University in Prague Prague Czech Republic

A new Quantum Field Theory formalism for neutrino oscillations is introduced. It identifies charged-current vertices with neutrino emission and detection, including neutrino propagation. A master formula for the charged lepton production rate, that works for both (anti)neutrino-(anti)neutrino and neutrino-antineutrino oscillations (and vice versa) in a macroscopic distance L, is presented. A relationship between Majorana masses associated with neutrino-antineutrino oscillations and neutrinoless double-beta decay is addressed. The potential of using the flux of reactor antineutrinos to observe antineutrino-neutrino oscillations is discussed. Further, an approach has been developed to construct amplitudes of processes related to neutrinos in terms of the neutrino mass matrix without reference to the neutrino mixing matrix. It is assumed that fitting experimental data in terms of the neutrino mass matrix can provide better statistical accuracy in determining the neutrino mass matrix compared to methods using the neutrino mixing matrix at intermediate stages. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

关键词： Neutron emission

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Neutrino oscillations and entanglement 12

Neutrino oscillations and entanglement

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12th Neutrino Oscillation Workshop, NOW 2024

The concept of neutrino oscillations is revisited. Using the Quantum Field Theory approach and applying plane waves for the initial and final states, the processes of neutrino production, propagation, and detection are described through a single Feynman diagram. The updated S-matrix approach ensures energy and momentum are conserved during neutrino oscillations. A master formula is provided to calculate the rate of charged lepton production for neutrinos oscillating over a macroscopic distance L. The process π+ + n → μ+ + e− + p serves to highlight this formalism, and the results obtained manifest the entanglement of the three involved processes: the production, propagation, and absorption of neutrinos. © Copyright owned by the author(s)

关键词： Neutrons

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Length-Minimizing LED Trees

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Operations Research Forum 2025年第1期6卷 1-38页

作者： Sarkociová Remešíková, Mariana Sarkoci, Peter Trnovská, Mária Department of Mathematics and Constructive Geometry Faculty of Civil Engineering Slovak University of Technology in Bratislava Radlinského 11 Bratislava 81005 Slovakia Department of Applied Mathematics and Statistics Faculty of Mathematics Physics and Informatics Mlynská Dolina F1 Bratislava 84248 Slovakia

In this paper, we introduce a previously not studied type of Euclidean tree called LED (Leaves of Equal Depth) tree. LED trees can be used, for example, in computational phylogeny, since they are a natural representative of the time evolution of a set of species in a feature space. This work is focused on LED trees that are length minimizers for a given set of leaves and a given isomorphism type. The underlying minimization problem can be seen as a variant of the classical Euclidean Steiner tree problem. Even though it has a convex objective function, it is rather non-trivial, since it has a non-convex feasible set. The main contribution of this paper is that we prove the uniqueness of a stationary point of the length function on the feasible set. Moreover, we prove several geometrical characteristics of the length minimizers that are analogous to the properties of Steiner minimal trees. We also explore some geometrical and topological properties of the feasible set. At the end, to demonstrate the applicability of our theoretical results, we show an example of an application in historical linguistics. © The Author(s) 2025.

关键词： Computational phylogeny Euclidean graph Euclidean tree Language evolution LED tree Length-minimizing tree Phylogenetic tree Steiner tree

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Searching for exotic modes of 2νββ with the SuperNEMO Experiment 42

Searching for exotic modes of 2νββ with the SuperNEMO Exp...

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42nd International Conference on High Energy physics, ICHEP 2024

作者： Petro, Maros Institute of Experimental and Applied Physics Czech Technical University in Prague Husova 5 Prague110 00 Czech Republic Faculty of Mathematics Physics and Informatics Comenius University in Bratislava Bratislava842 48 Slovakia

Measurements of two-neutrino double beta decay (2νββ) have played a key role in advancing the understanding of neutrino properties. Further exploration of 2νββ and its possible exotic decay modes (decay with right-handed or sterile neutrinos) may provide further knowledge. The recently published improved description of the shape of 2νββ spectrum provides a methodology for precise calculations of the axial vector coupling constant gA. The signature of these processes should be most evident by examining the single-electron energy spectra and the distribution of the decay angle. These variables can uniquely be obtained with the SuperNEMO Demonstrator. The detector is currently taking data for background studies. Once passive shielding is installed in the second half of 2024, the 2νββ data-taking campaign will begin. In this contribution we present how SuperNEMO can be utilized in the search for exotic 2νββ. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

关键词： Electron scattering

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Explaining Internal Representations in Deep Networks: Adversarial Vulnerability of Image Classifiers and Learning Sequential Tasks with Sparse Reward

Explaining Internal Representations in Deep Networks: Advers...

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International Symposium on applied Machine Intelligence and informatics (SAMI)

作者： Igor Farkaš Department of Applied Informatics Physics and Informatics Centre for Cognitive Science Faculty of Mathematics Comenius University Bratislava Slovak Republic

ISBN: (数字)9798350379365

ISBN: (纸本)9798350379372

Modern artificial intelligence based on deep neural networks has demonstrated in the past decade great achievements in concrete tasks, sometimes even surpassing human performance. On the other hand, there exist fundamental problems in these models, be it image classification or natural language tasks. Since deep networks are inherently black boxes, it is important to design and apply techniques that help shed light on the functioning of the trained models. In the talk, we will discuss two domains. First, in the context of image classification we will illustrate the effect of adversarial examples that can easily fool trained models, hence revealing their lack of robustness. In the second part, we will deal with sequential tasks, such as computer games, with an extremely sparse reward. Introducing the concept of intrinsic motivation, we will describe the neural networks based model that can successfully use reinforcement learning and self-supervised knowledge distillation to solve these tasks thanks to optimized organization of its internal representations. Finally, we briefly mention our current work related to cognitive robotics.

关键词： Knowledge engineering Video games Computational modeling Natural languages Reinforcement learning Organizations Robustness informatics Machine intelligence Image classification

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DOUBLE-BETA DECAY OF 48Ca WITHIN SECOND TAMM–DANCOFF APPROXIMATION

DOUBLE-BETA DECAY OF 48Ca WITHIN SECOND TAMM–DANCOFF APPROX...

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Zakopane Conference on Nuclear physics Extremes of the Nuclear Landscape

作者： Veselý, P. Denisova, D. Knapp, F. Šimkovic, F. Nuclear Physics Institute Czech Academy of Sciences Řež250 68 Czech Republic Faculty of Mathematics and Physics Charles University Prague116 36 Czech Republic Faculty of Physics Mathematics and Informatics Comenius University in Bratislava Mlynská dolina F1 Bratislava842 48 Slovakia Institute of Experimental and Applied Physics Czech Technical University in Prague Prague110 00 Czech Republic

The neutrinoless double-beta decay (0νββ) nuclear matrix elements (NMEs) cannot be directly deduced from any experimental data, and their reliable calculation remains a significant challenge for the nuclear physics community. Advanced nuclear structure approaches have been developed and applied to evaluate nuclear transitions of experimental interest. However, the calculated values of 0νββ NMEs still vary widely among different methods, affecting predictions of decay rates and constraints on various lepton violation parameters. The two-neutrino double-beta (2νββ) decay, which has been experimentally confirmed for eleven isotopes, plays a crucial role in testing nuclear structure models. In this context, we present the modified formalism of the Second Tamm–Dancoff Approximation (STDA) for the calculation of double-beta decay transitions. For 2νββ of 48Ca, the corresponding NMEs are calculated within the STDA, and their dependence on relevant nuclear structure parameters is investigated. Our findings indicate that a significant quenching of the axial-vector coupling constant is necessary to accurately reproduce the half-life of 2νββ decay. © 2025 Jagiellonian University. All rights reserved.

关键词： Radioactivity

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