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arXiv 2022年

作者： Assadi, Sepehr Kumar, Pankaj Mittal, Parth Department of Computer Science Rutgers University United States Cheriton School of Computer Science University of Waterloo Canada Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic

Every graph with maximum degree Δ can be colored with (Δ + 1) colors using a simple greedy algorithm. Remarkably, recent work has shown that one can find such a coloring even in the semi-streaming model: there exists a randomized algorithm that with high probability finds a (Δ + 1)-coloring of the input graph in only O(n · polylog n) space assuming a single pass over the edges of the graph in any arbitrary order. But, in reality, one almost never needs (Δ + 1) colors to properly color a graph. Indeed, the celebrated Brooks’ theorem states that every (connected) graph beside cliques and odd cycles can be colored with Δ colors. Can we find a Δ-coloring in the semi-streaming model as well? We settle this key question in the affirmative by designing a randomized semi-streaming algorithm that given any graph, with high probability, either correctly declares that the graph is not Δ-colorable or outputs a Δ-coloring of the graph. The proof of this result starts with a detour. We first (provably) identify the extent to which the previous approaches for streaming coloring fail for Δ-coloring: for instance, all these prior approaches can handle streams with repeated edges and they can run in O(n2) time, whereas © 2022, CC BY.

关键词： Coloring

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Measurement and interpretation of same-sign W boson pair production in association with two jets in pp collisions at (Formula presented.) TeV with the ATLAS detector

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Journal of High Energy physics 2024年第4期2024卷 26页

作者： Aad, G. Abbott, B. Abeling, K. Abicht, N.J. Abidi, S.H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Abusleme Hoffman, A.C. Acharya, B.S. Adam Bourdarios, C. Adamczyk, L. Adamek, L. Addepalli, S.V. Addison, M.J. Adelman, J. Adiguzel, A. Adye, T. Affolder, A.A. Afik, Y. Agaras, M.N. Agarwala, J. Aggarwal, A. agheorghiesei, C. Ahmad, A. Ahmadov, F. Ahmed, W.S. Ahuja, S. Ai, X. Aielli, G. Aikot, A. Ait Tamlihat, M. Aitbenchikh, B. Aizenberg, I. Akbiyik, M. Åkesson, T.P.A. Akimov, A.V. Akiyama, D. Akolkar, N.N. Al Khoury, K. Alberghi, G.L. Albert, J. Albicocco, P. Albouy, G.L. Alderweireldt, S. Aleksa, M. Aleksandrov, I.N. Alexa, C. Alexopoulos, T. Alfonsi, F. Algren, M. Alhroob, M. Ali, B. Ali, H.M.J. Ali, S. Alibocus, S.W. Aliev, M. Alimonti, G. Alkakhi, W. Allaire, C. Allbrooke, B.M.M. Allen, J.F. Allendes Flores, C.A. Allport, P.P. Aloisio, A. Alonso, F. Alpigiani, C. Alvarez Estevez, M. Alvarez Fernandez, A. Alves Cardoso, M. Alviggi, M.G. Aly, M. Amaral Coutinho, Y. Ambler, A. Amelung, C. Amerl, M. Ames, C.G. Amidei, D. Amor Dos Santos, S.P. Amos, K.R. Ananiev, V. Anastopoulos, C. Andeen, T. Anders, J.K. Andrean, S.Y. Andreazza, A. Angelidakis, S. Angerami, A. Anisenkov, A.V. Annovi, A. Antel, C. Anthony, M.T. Antipov, E. Antonelli, M. Anulli, F. Aoki, M. Aoki, T. Aparisi Pozo, J.A. Aparo, M.A. Aperio Bella, L. Appelt, C. Apyan, A. Aranzabal, N. Arcangeletti, C. Arce, A.T.H. Arena, E. Arguin, J.-F. Argyropoulos, S. Arling, J.-H. Arnaez, O. Arnold, H. Artoni, G. Asada, H. Asai, K. Asai, S. Asbah, N.A. Assamagan, K. Astalos, R. Atashi, S. Atkin, R.J. Atkinson, M. Atmani, H. Atmasiddha, P.A. Augsten, K. Auricchio, S. Auriol, A.D. Austrup, V.A. Avolio, G. Axiotis, K. Azuelos, G. Babal, D. Bachacou, H. Bachas, K. Bachiu, A. Backman, F. Badea, A. Bagnaia, P. Bahmani, M. Bailey, A.J. Bailey, V.R. Baines, J.T. Baines, L. Bakalis, C. Baker, O.K. Bakos, E. Bakshi Gupta, D. Balakrishnan, V. Balasubramanian, R. Baldin, E.M. Balek, P. Ballabene, E. Balli, F. Baltes, L.M. Balunas, W.K. Balz, J. Banas, E. Bandieramont Department of Physics University of Adelaide Department of Physics University of Alberta Department of Physics Ankara University Division of Physics TOBB University of Economics and Technology LAPP Université Savoie Mont Blanc CNRS/IN2P3 APC Université Paris Cité CNRS/IN2P3 High Energy Physics Division Argonne National Laboratory Department of Physics University of Arizona Department of Physics University of Texas at Arlington Physics Department National and Kapodistrian University of Athens Physics Department National Technical University of Athens Department of Physics University of Texas at Austin Institute of Physics Azerbaijan Academy of Sciences Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Institute of High Energy Physics Chinese Academy of Sciences Physics Department Tsinghua University Department of Physics Nanjing University School of Science Shenzhen Campus of Sun Yat-sen University University of Chinese Academy of Science (UCAS) Institute of Physics University of Belgrade Department for Physics and Technology University of Bergen Physics Division Lawrence Berkeley National Laboratory University of California Institut für Physik Humboldt Universität zu Berlin Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern School of Physics and Astronomy University of Birmingham Department of Physics Bogazici University Department of Physics Engineering Gaziantep University Department of Physics Istanbul University Facultad de Ciencias y Centro de Investigaciónes Universidad Antonio Nariño Departamento de Física Universidad Nacional de Colombia Dipartimento di Fisica e Astronomia A. Righi Università di Bologna INFN Sezione di Bologna Physikalisches Institut Universität Bonn Department of Physics Boston University Department of Physics Brandeis University Transilvania University of Brasov Horia Hulubei National Institute of Physics and Nuclear Engineering Department of Physics Alexandru

This paper presents the measurement of fiducial and differential cross sections for both the inclusive and electroweak production of a same-sign W-boson pair in association with two jets (W^±W^±jj) using 139 fb⁻¹ of proton-proton collision data recorded at a centre-of-mass energy of s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed by selecting two same-charge leptons, electron or muon, and at least two jets with large invariant mass and a large rapidity difference. The measured fiducial cross sections for electroweak and inclusive W^±W^±jj production are 2.92 ± 0.22 (stat.) ± 0.19 (syst.) fb and 3.38 ± 0.22 (stat.) ± 0.19 (syst.) fb, respectively, in agreement with Standard Model predictions. The measurements are used to constrain anomalous quartic gauge couplings by extracting 95% confidence level intervals on dimension-8 operators. A search for doubly charged Higgs bosons H^±± that are produced in vector-boson fusion processes and decay into a same-sign W boson pair is performed. The largest deviation from the Standard Model occurs for an H^±± mass near 450 GeV, with a global significance of 2.5 standard deviations. © The Author(s) 2024.

关键词： Hadron-Hadron Scattering Vector Boson Production

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Graph grammars and physics Informed Neural Networks for simulating of pollution propagation on Spitzbergen

arXiv

引用

arXiv 2024年

作者： Sikora, Maciej Oliver-Serra, Albert Siwik, Leszek Leszczyńska, Natalia Ciesielski, Tomasz Maciej Valseth, Eirik Leszczyński, Jacek Paszyńska, Anna Paszyński, Maciej AGH University of Krakow Faculty of Computer Science Al. Mickiewicza 30 Kraków30-059 Poland Las Palmas de Gran Canaria Spain Medical University of Silesia-Katowice Faculty of Medical Sciences Katowice Poland The University Centre in Svalbard Longyearbyen Norway Norwegian University of Life Sciences Ås Norway The Oden Institute for Computational Engineering Sciences The University of Texas AustinTX United States Simula Research Laboratory Oslo Norway Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Lojasiewicza 11 Kraków30-348 Poland

In this paper, we present two computational methods for performing simulations of pollution propagation described by advection-diffusion equations. The first method employs graph grammars to describe the generation process of the computational mesh used in simulations with the meshless solver of the three-dimensional finite element method. The graph transformation rules express the three-dimensional Rivara longest-edge refinement algorithm. This solver is used for an exemplary application: performing three-dimensional simulations of pollution generation by the coal-burning power plant and its propagation in the city of Longyearbyen, the capital of Spitsbergen. The second computational code is based on the physics Informed Neural Networks method. It is used to calculate the dissipation of the pollution along the valley in which the city of Longyearbyen is located. We discuss the instantiation and execution of the PINN method using Google Colab implementation. We discuss the benefits and limitations of the PINN *** Codes In this paper, we present two computational methods for performing simulations 65, 35, 68T07 © 2024, CC BY.

关键词： Coal combustion

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Climatic Sensitivity and the Growth Prospects of Silver Fir and European Larch in the Carpathians in the Light of Observed Climate Changes

SSRN

引用

SSRN 2024年

作者： Wilczyński, Slawomir Danek, Malgorzata Danek, Tomasz Department of Forest Ecosystem Protection Faculty of Forestry University of Agriculture in Krakow Al. 29 Listopada 46 Kraków31-425 Poland Department of Geoinformatics and Applied Computer Science Faculty of Geology Geophysics and Environmental Protection AGH University of Krakow Al. Mickiewicza 30 Kraków30-059 Poland

One consequence of climate change is the rapid extinction of spruce monocultures in the Carpathians. Therefore, the need has arisen to replace spruce with other highly productive species that ensure the stability and biodiversity of mountain forests, such as the Abies alba and Larix decidua. These co-occurring conifers show different successional and phenological characteristics: L. decidua is a light-demanding species that dominates in the early successional stages, while A. alba is a moderately shade-tolerant tree. This study attempts to identify climatic factors that determine the tree-ring width of fir and larch in order to assess the growth prospects of these species in the context of the ongoing climate change. Tree-ring width chronologies of 42 sub-populations of fir and 36 of larch from the area of the Western Carpathians were used. Regional growth patterns for each species were used to estimate the relationship between temperature/precipitation and radial growth. Linear correlation analyses and nonlinear Random Forest models were used. Fir growth was significantly positively influenced by the high temperature of January–March and July and the high precipitation of February and July of the year of tree-ring formation. Larch growth was positively affected by the high temperature of May and the low precipitation of April and September of the year of tracheid formation. Unlike larch, fir growth increased if May and June of the preceding year were warm. The dominant climatic factor influencing fir growth was February temperature, whereas larch growth was influenced mainly by the May temperature of the year of tree-ring formation. Most of the recently observed changes in climatic factors that are important for the growth of both species are favorable. Thus, increasing the share of both species in the Carpathian forests seems fully justified as this will contribute to the stability, productivity, and biodiversity of the region’s forests. © 2024, The Authors. All r

关键词： Climate change

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Security of the Cryptosystem GPT Based on Rank Codes and Term-rank Codes

Security of the Cryptosystem GPT Based on Rank Codes and Ter...

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2021 International Conference Engineering and Telecommunication, En and T 2021

作者： Nguyen, Du Hoan Pham, Huu Loc Le Thi Trang, Linh Phystech School of Radio Engineering and Computer Science Moscow Institute of Physics and Technology Moscow Russia Electric Power University Information Technology Faculty Hanoi Viet Nam

ISBN: (纸本)9781728183909

This paper investigates public key cryptosystems (PKC) in the rank metric and term-rank metric. For security analysis of cryptosystems, we introduce a GPT system. Recently, respective structural attacks this system were proposed by Over-beck. For GPT system, Overbeck's attack succeeds in polynomial time. We will discuss the new construction of Shiki system. This paper describes Overbeck's attack to the new Shiki system. Also, investigation of the possibility of using term-rank codes in public key cryptosystems. © 2021 IEEE.

关键词： Polynomial approximation

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Practical Quantum Circuit Implementation for Simulating Coupled Classical Oscillators

arXiv

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arXiv 2025年

作者： Luangsirapornchai, Natt Sanglaor, Peeranat Sornsaeng, Apimuk Bressan, Stéphane Chotibut, Thiparat Suksen, Kamonluk Chongstitvatana, Prabhas Department of Computer Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Chula Intelligent and Complex Systems Lab Department of Physics Faculty of Science Chulalongkorn University Bangkok10330 Thailand Science Mathematics and Technology Cluster Singapore University of Technology and Design 8 Somapah Road 487372 Singapore School of Computing National University of Singapore 13 Computing Drive Singapore117417 Singapore

Simulating large-scale coupled-oscillator systems presents substantial computational challenges for classical algorithms, particularly when pursuing first-principles analyses in the thermodynamic limit. Motivated by the quantum algorithm framework proposed by Babbush et al. [1], we present and implement a detailed quantum circuit construction for simulating one-dimensional spring-mass systems. Our approach incorporates key quantum subroutines, including block encoding, quantum singular value transformation (QSVT), and amplitude amplification, to realize the unitary time-evolution operator associated with simulating classical oscillators dynamics. In the uniform spring-mass setting, our circuit construction requires a gate complexity of (formula presented), where N is the number of oscillators and Ε is the target accuracy of the approximation. For more general, heterogeneous spring-mass systems, the total gate complexity is O(N log2 N log2(1/Ε)). Both settings require O(log2 N) qubits. Numerical simulations agree with classical solvers across all tested configurations, indicating that this circuit-based Hamiltonian simulation approach can substantially reduce computational costs and potentially enable larger-scale many-body studies on future quantum hardware. © 2025, CC0.

关键词： Hamiltonians

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Relationships between Microbiological and Physicochemical Properties of Substrata, Fungal Root Colonisation and Plant Performance of Commercially Available Ornamental Plant Species Grown in Pots

SSRN

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SSRN 2024年

作者： Móll, Maciej Skubala, Kaja Baran, Katarzyna Wróbel, Maria Rożek, Katarzyna Stanek, Malgorzata Orzechowska, Aleksandra Zubek, Szymon Institute of Botany Faculty of Biology Jagiellonian University in Kraków Gronostajowa 3 Kraków30-387 Poland W. Szafer Institute of Botany Polish Academy of Sciences Lubicz 46 Kraków31-512 Poland Faculty of Physics and Applied Computer Science AGH University of Kraków Al. Mickiewicza 30 Kraków30-059 Poland

The relationships of ornamental plants with soil microorganisms, which can either stimulate or suppress their performance and thereby impact the production process, remain largely unexplored. Therefore, we conducted a study on 10 common ornamental plant species available in large DIY stores to compare the microbiological and physicochemical properties of substrata used for their cultivation and assess their colonisation by root-inhabiting fungi, namely arbuscular mycorrhizal fungi (AMF), dark septate endophytes (DSE), and Olpidium. The substrata exhibited significant variations in their microbiological and physicochemical properties, depending on both their origin from DIY stores and the ornamental plant species. Hyphae and spores of AMF were not found in any analysed roots and substrata, respectively, except for the low level of colonisation observed in Echinacea purpurea roots. However, 8 plant species were colonised by DSE and 8 by Olpidium spp. More acidic substrata with a high content of organic matter and the ability to hold water favoured the colonisation of Olpidium spp. in roots, and the opposite trend was found for DSE. The occurrence of both groups of endophytes, especially Olpidium, was limited in plants with higher biomass and vitality. In conclusion, commercially available ornamental plant species rarely form symbiotic associations with AMF in pot cultivation. Instead, they are often colonised by other root-inhabiting fungi, such as DSE, which are known to have either positive or negative effects on their hosts, and Olpidium spp., which can transfer plant viruses. We suspect that these results are due to high nutrient, organic matter, and water contents in substrata. © 2024, The Authors. All rights reserved.

关键词： Fungi

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Structural investigation of the liquid crystalline phases of three homologues from the nOS5 series (n = 9, 10, 11) by X-ray diffraction

arXiv

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arXiv 2024年

作者： Deptuch, Aleksandra Sęk, Bartosz Lalik, Sebastian Ossowska-Chruściel, Miroslawa D. Chruściel, Janusz Marzec, Monika Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 KrakówPL-31342 Poland Faculty of Physics and Applied Computer Science AGH University of Kraków Reymonta 19 KrakówPL-30059 Poland Institute of Physics Jagiellonian University Lojasiewicza 11 KrakówPL-30348 Poland Institute of Chemistry Siedlce University of Natural Sciences and Humanities 3 Maja 54 SiedlcePL-08110 Poland

Polarizing optical microscopy and differential scanning calorimetry are used to determine the phase sequence of three liquid crystalline 4-pentylphenyl-4’-n-alkyloxythiobenzoates with n = 9, 10, 11. The X-ray diffraction method is applied for structural characterization of the liquid crystalline phases. The smectic layer spacing, tilt angle, average distance between the long axes of molecules and correlation length of the short-range order are determined as a function of temperature. For the crystal-like smectic phases with the hexagonal or herring-bone packing, the unit cell parameters are obtained. The presence of the tilted hexagonal phase for n = 10, 11 and tilted herring-bone phase for n = 9, 10 is indicated, although the direction of the tilt cannot be determined. © 2024, CC BY.

关键词： Bone

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Assessment of the Feasibility of Employing Chaos Synchronization in Two Cascaded Microresonators for Secure Data Transmission

Assessment of the Feasibility of Employing Chaos Synchroniza...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Deniz Lemcke David Moreno Shun Fujii Ayata Nakashima Atsushi Uchida Takasumi Tanabe Department of Electronics and Electrical Engineering Faculty of Science and Technology Keio University Yokohama Japan RWTH Aachen University Aachen Germany Polytechnic University of Valencia Valencia Spain Department of Physics Faculty of Science and Technology Keio University Yokohama Japan Department of Information and Computer Sciences Saitama University Saitama Japan

ISBN: (纸本)9798350345995

As the limits of computational power continue to increase, concern has arisen regarding insufficient security along with a demand for improvements in encryption methods for data transmission, which might be achieved by chaos synchronization [1], [2]. Using modified Lugiato-Levefer equations (LLEs), we numerically explore two cascaded microresonator frequency combs [3]. To obtain a chaotic state, both cavities are pumped by continuous-wave lasers until modulation instability (MI) combs are generated. By injecting the output of the first resonator into the second resonator, both chaotic fields in the cavities are synchronized. In this work, we investigate to what extent the chaos is synchronized and how this phenomenon may be implemented in existing data transmission systems over a chaotic channel to enable secure communication.

关键词： Chaos Frequency combs Instabilities Microcavities Optical resonators Phase shift

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Controllable magnetic anisotropy and spin orientation of a prototypical easy-plane antiferromagnet on a ferromagnetic support

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Physical Review B 2021年第13期104卷 134434-134434页

作者： M. Ślęzak H. Nayyef P. Dróżdż W. Janus A. Kozioł-Rachwał M. Szpytma M. Zając T. O. Menteş F. Genuzio A. Locatelli T. Ślęzak AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland National Synchrotron Radiation Centre SOLARIS Jagiellonian University Kraków Poland Elettra - Sincrotrone Trieste Basovizza Trieste Italy CERIC-ERIC Basovizza Trieste Italy

We report the magnetic properties of easy-plane antiferromagnetic NiO(111) thin films epitaxially grown on ferromagnetic Fe(110) layers. We find that the magnetic moments in NiO are rotatable within the NiO(111) sample plane and both magnetic anisotropy and orientation of antiferromagnetic NiO spins are determined by the magnetic properties of underlying ferromagnetic Fe layer. Specifically, the magnetic state and anisotropy of antiferromagnetic NiO can be modified by tuning the thickness of Fe, changing the temperature, or applying small external magnetic field.

关键词： Crystal phenomena Magnetic anisotropy Magnetic interactions Magnetic order Magnetic phase transitions Methods in magnetism Antiferromagnets Crystal structures Ferromagnets Magnetic insulators Magnetic multilayers Surfaces Thin films Electron diffraction Epitaxy Evaporation Kerr effect Magnetization measurements X-ray absorption spectroscopy X-ray magnetic circular dichroism X-ray magnetic linear dichroism X-ray photoemission electron microscopy

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