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Does social distancing matter for infectious disease propagation? A SEIR model and Gompertz law based cellular automaton

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arXiv 2022年

作者： Biernacki, Szymon Malarz, Krzysztof AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

In this paper, we present stochastic synchronous cellular automaton defined on a square lattice. The automaton rules are based on the SEIR (susceptible → exposed → infected → recovered) model with probabilistic parameters gathered from real-world data on human mortality and the characteristics of the SARS-CoV-2 disease. With computer simulations, we show the influence of the radius of the neighborhood on the number of infected and deceased agents in the artificial population. The increase in the radius of the neighborhood favors the spread of the epidemic. However, for a large range of interactions of exposed agents (who neither have symptoms of the disease nor have been diagnosed by appropriate tests), even isolation of infected agents cannot prevent successful disease propagation. This supports aggressive testing against disease as one of the useful strategies to prevent large peaks of infection in the spread of SARS-CoV-2-like disease. © 2022, CC BY.

关键词： Cellular automata

Manipulating electron waves in graphene using carbon nanotube gating

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Physical Review B 2022年第19期105卷 195416-195416页

作者： Shiang-Bin Chiu (邱翔彬) Alina Mreńca-Kolasińska (柯琳娜) Ka Long Lei (李嘉朗) Ching-Hung Chiu (邱靖鈜) Wun-Hao Kang (康文豪) Szu-Chao Chen (陳思超) Ming-Hao Liu (劉明豪) Department of Physics National Cheng Kung University Tainan 70101 Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

Graphene with its dispersion relation resembling that of photons offers ample opportunities for applications in electron optics. The spacial variation of carrier density by external gates can be used to create electron waveguides, in analogy to optical fiber, with additional confinement of the carriers in bipolar junctions leading to the formation of few transverse guiding modes. We show that waveguides created by gating graphene with carbon nanotubes (CNTs) allow obtaining sharp conductance plateaus, and propose applications in the Aharonov-Bohm and two-path interferometers, and a pointlike source for injection of carriers in graphene. Other applications can be extended to Bernal-stacked or twisted bilayer graphene or two-dimensional electron gas. Thanks to their versatility, CNT-induced waveguides open various possibilities for electron manipulation in graphene-based devices.

关键词： Aharonov-Bohm effect Ballistic transport Quantum transport Graphene III-V semiconductors Nanotubes Quantum rings Two-dimensional electron gas Finite-element method Landauer formula Tight-binding model

Coddora: CO2-Based Occupancy Detection Model Trained via Domain Randomization

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Coddora: CO2-Based Occupancy Detection Model Trained via Dom...

International Joint Conference on Neural Networks (IJCNN)

作者： Manuel Weber Farzan Banihashemi Davor Stjelja Peter Mandl Ruben Mayer Hans-Arno Jacobsen Department of Computer Science and Mathematics Munich University of Applied Sciences (HM) Munich Germany Chair of Energy Efficient and Sustainable Design and Building Technical University of Munich Germany Department of Mechanical Engineering Aalto University Espoo Finland Faculty of Mathematics Physics and Computer Science University of Bayreuth Germany Department of Electrical and Computer Engineering University of Toronto Canada

ISBN: (数字)9798350359312

ISBN: (纸本)9798350359329

Information about human presence in indoor spaces is crucial for building energy optimization. While there has been a considerable amount of research on using neural networks to automatically detect occupancy from CO2 sensors, their application in practice is limited due to the scarcity of labeled training data. In this paper, we propose Coddora, an off-the-shelf deep learning model pretrained on data from randomized room simulations. Coddora enables quick adaptation to real-world rooms, requiring only minimal data collection. Our contribution includes two model variants for application via fine-tuning or zero-shot classifying, as well as the synthetic dataset providing data from simulations with 100,000 room models.

关键词： Training Adaptation models Accuracy Buildings Neural networks Transfer learning Training data

Acceptance dependence of factorial cumulants, long-range correlations, and the antiproton puzzle

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arXiv 2025年

作者： Bzdak, Adam Koch, Volker Vovchenko, Volodymyr AGH University of Krakow Faculty of Physics and Applied Computer Science Kraków30-059 Poland Nuclear Science Division Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States Physics Department University of Houston 3507 Cullen Blvd HoustonTX77204 United States

We analyze joint factorial cumulants of protons and antiprotons in relativistic heavy-ion collisions and point out that they obey the scaling (Formula presented) as a function of acceptance when only long-range correlations are present in the system, such as global baryon conservation and volume fluctuations. This hypothesis can be directly tested experimentally without the need for corrections for volume fluctuations. We show that if correlations among protons and antiprotons are driven by global baryon conservation and volume fluctuations only, the equality (Formula presented) holds for large systems created in central collisions. We point out that the experimental data of the STAR Collaboration from phase I of RHIC beam energy scan are approximately consistent with the scaling (Formula presented), but the normalized antiproton correlations are stronger than that of protons, (Formula presented)2, indicating that global baryon conservation and volume fluctuations alone cannot explain the data. We also discuss high-order factorial cumulants which can be measured with sufficient precision within phase II of RHIC-BES. Copyright © 2025, The Authors. All rights reserved.

关键词： Heavy ions

Forward Brillouin Point Sensor in a Multi-Core Fiber 27

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Forward Brillouin Point Sensor in a Multi-Core Fiber

27th International Conference on Optical Fiber Sensors, OFS 2022

作者： Shemer, Keren Bashan, Gil Zehavi, Elad Diamandi, Hilel Hagai Bernstein, Alon Sharma, Kavita London, Yosef Barrera, David Sales, Salvador Zadok, Avi Faculty of Engineering and Institute for Nano-Technology and Advanced Materials Bar-Ilan University Ramat-Gan5290002 Israel Department of Computer Science and Applied Mathematics Weizmann Institute of Science Rehovot7610001 Israel Currently with Applied Physics Division Soreq NRC Yavne81800 Israel Photonics Research Labs Universitat Politècnica de València Valencia46022 Spain

Forward Brillouin point sensing is demonstrated in a multi-core fiber. Acoustic waves are stimulated by light in one core and monitored using a grating in another. Measurements distinguish between ethanol and water ou... 详细信息

ISBN: (纸本)9781957171142

关键词： Effective refractive index Fiber optic sensors Forward scattering Multicore fibers Phase modulation Tunable diode lasers

Are You Aroused Enough to See the Difference? The Role of Physiological Arousal in Perceiving Realism of Virtual Scene

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Are You Aroused Enough to See the Difference? The Role of Ph...

IEEE International Symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Natalia Lipp Paweł Strojny Agnieszka Strojny Sławomir Śpiewak Jan Argasiński Przemysław Korzeniowski Sano Centre for Computational Medicine Kraków Poland Faculty of Management and Social Communication Jagiellonian University Kraków Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków Poland

Simulation realism is a crucial factor for task performance in virtual reality. The issue is that it does not simply result from a simulation's graphical quality and is often connected to users' expectations and the capacity of the cognitive system. It is assumed that perceived realism may be affected by physiological arousal which is the basis of emotional reactions and of attention prioritizing. The main aim of the presented study is to verify whether perceptual characteristics of a virtual scene – complexity and vividness of virtual objects – affect perceived realism. The secondary aim is to test whether realism assessment changes because of arousal. An experimental study was conducted with 100 participants in total. Four experimental groups differ in terms of the complexity of a virtual scene (i.e., number of objects in the field of view) and vividness of virtual objects (i.e., figure-ground contrast). Participants were asked to perform a task, that was taking on the role of a marshaller and positioning the plane on the airport apron in the virtual reality simulation. During the task, electrodermal activity was measured. After the virtual session, participants assessed perceived realism. Results indicate that the complexity and vividness of virtual scene do not affect perceived realism directly. Physiological arousal (i.e., skin conductance level) is a moderator of the relationship between the vividness of the virtual scene and perceived realism. A high level of arousal increases realism assessment in vivid simulations.

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Finding hardness reductions automatically using SAT solvers

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arXiv 2024年

作者： Bergold, Helena Scheucher, Manfred Schröder, Felix Department of Computer Science Freie Universität Berlin Germany Institut für Mathematik Technische Universität Berlin Germany Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic

In this article, we show that the completion problem, i.e. the decision problem whether a partial structure can be completed to a full structure, is NP-complete for many combinatorial structures. While the gadgets for most reductions in literature are found by hand, we present an algorithm to construct gadgets in a fully automated way. Using our framework which is based on SAT, we present the first thorough study of the completion problem on sign mappings with forbidden substructures by classifying thousands of structures for which the completion problem is NP-complete. Our list in particular includes interior triple systems, which were introduced by Knuth towards an axiomatization of planar point configurations. Last but not least, we give an infinite family of structures generalizing interior triple system to higher dimensions for which the completion problem is NP-complete. Copyright © 2024, The Authors. All rights reserved.

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Transport properties and doping evolution of the Fermi surface in cuprates

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arXiv 2023年

作者： Klebel-Knobloch, Benjamin Tabis, Wojciech Gala, Mateusz A. Barišić, Osor S. Sunko, Denis K. Barišić, Neven Institute of Solid State Physics TU Wien Vienna1040 Austria AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow30-059 Poland Institute of Physics Bijenička cesta 46 ZagrebHR-10000 Croatia Department of Physics Faculty of Science University of Zagreb Bijenička cesta 32 ZagrebHR-10000 Croatia

Measured transport properties of three representative cuprates are reproduced within the paradigm of two electron subsystems, itinerant and localized. The localized subsystem evolves continuously from the Cu 3d9 hole at half-filling and corresponds to the (pseudo)gapped parts of the Fermi surface. The itinerant subsystem is observed as a pure Fermi liquid (FL) with material-independent universal mobility across the doping/temperature phase diagram. The localized subsystem affects the itinerant one in our transport calculations solely by truncating the textbook FL integrals to the observed (doping- and temperature-dependent) Fermi arcs. With this extremely simple picture, we obtain the measured evolution of the resistivity and Hall coefficients in all three cases considered, including LSCO which undergoes a Lifshitz transition in the relevant doping range, a complication which turns out to be superficial. Our results imply that prior to evoking polaronic, quantum critical point, quantum dissipation, or even more exotic scenarios for the evolution of transport properties in cuprates, Fermi-surface properties must be addressed in realistic detail. © 2023, CC BY.

关键词： Transport properties

Random site percolation on honeycomb lattices with complex neighborhoods

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arXiv 2022年

作者： Malarz, Krzysztof AGH University Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

We present a rough estimation—up to four significant digits, based on the scaling hypothesis and the probability of belonging to the largest cluster vs. the occupation probability—of the critical occupation probabilities for the random site percolation problem on a honeycomb lattice with complex neighborhoods containing sites up to the fifth coordination zone. There are 31 such neighborhoods with their radius ranging from one to three and containing from three to 24 sites. For two-dimensional regular lattices with compact extended-range neighborhoods, in the limit of the large number z of sites in the neighborhoods, the site percolation thresholds pc follow the dependency pc ∝ 1/z, as recently shown by Xun, Hao and Ziff [Physical Review E 105, 024105 (2022)]. On the contrary, noncompact neighborhoods (with holes) destroy this dependence due to the degeneracy of the percolation threshold (several values of pc corresponding to the same number z of sites in the neighborhoods). An example of a single-value index ζ = Pi ziri—where zi and ri are the number of sites and radius of the i-th coordination zone, respectively —-characterizing the neighborhood and allowing avoiding the above-mentioned degeneracy is presented. The percolation threshold obtained follows the inverse square root dependence pc ∝ 1/√ζ. The functions boundaries() (written in C) for basic neighborhoods (for the unique coordination zone) for the Newman and Ziff algorithm [Physical Review E 64, 016706 (2001)] are also presented. © 2022, CC BY-NC-SA.

关键词： Coordination reactions