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4 THz beam filter based on a back to back Si-lens system 31

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4 THz beam filter based on a back to back Si-lens system

2020 31st IEEE International Symposium on Space Terahertz technology, ISSTT 2020

作者： Gan, Y. Mirzaei, B. Van Der Poel, S. Silva, J.R. Finkel, M. Eggens, M. Ridder, M. Khalatpour, A. Hu, Q. Van Der Tak, F.F.S. Gao, J.R. Sron Netherlands Institute for Space Research Netherlands Kapteyn Astronomical Institute University of Groningen Groningen9747 AD Netherlands Faculty of Applied Science Delft University of Technology Netherlands Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology United States

Towards the Heider balance with a cellular automaton

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arXiv 2020年

作者： Malarz, Krzysztof Woloszyn, Maciej Ku lakowski, Krzysztof AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakw30-059 Poland

The state of structural balance (termed also ‘Heider balance’) of a social network is often discussed in social psychology and sociophysics. In this state, actors at network nodes classify other individuals as enemies or friends. Hence, the network contains two kinds of links: positive and negative. Here a new cellular automaton is designed and investigated, which mimics the time evolution towards the structural balance. The automaton is deterministic and synchronous. The medium is the triangular lattice with some fraction f of links removed. We analyse the number of unbalanced triads (parameterized as ‘energy’), the frequencies of balanced triads and correlations between them. The time evolution enhances the local correlations of balanced triads. Local configurations of unbalanced triads are found which are blinking with period of two time steps. Copyright © 2020, The Authors. All rights reserved.

关键词： Cellular automata

Heider balance of a chain of actors as dependent on the interaction range and a thermal noise

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arXiv 2020年

作者： Malarz, Krzysztof Kulakowski, Krzysztof AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakw30-059 Poland

The Heider balance is investigated in a chain of actors, with periodic boundary conditions and the neighborhood of range r, with r as a parameter. Two model dynamics are applied: a deterministic cellular automaton (Malarz et al, Physica D 411 (2020) 132556) and the heat-bath algorithm, with the density of unbalanced-balanced triads in the role of energy. The outcome is a spectrum of energy in stationary and blinking states and a balanced-unbalanced network transition driven by thermal noise. The critical point Tc increases with the range r and it does not depend on the system size. Copyright © 2020, The Authors. All rights reserved.

关键词： Thermal noise

Investigation of collective effects in DIS with the ZEUS detector 39

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Investigation of collective effects in DIS with the ZEUS det...

39th International Conference on High Energy physics, ICHEP 2018

作者： Przybycien, Mariusz Agh University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 Cracow30-059 Poland

We present a preliminary measurement of two-particle correlations in collisions of electron beam at 27.5 GeV with beam of protons at 920 GeV, which corresponds to 318 GeV centre-of-mass energy. A sample of events equivalent to the integrated luminosity of 366 pb1 was recorded with the ZEUS experiment in 2003-2007. The correlations are measured for charged hadrons as a function of event multiplicity for the laboratory pseudorapidity range 1:5 © 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： Germanium alloys

Graph convolutional networks enable fast hemorrhagic stroke monitoring with electrical impedance tomography

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arXiv 2024年

作者： Toivanen, J. Kolehmainen, V. Paldanius, A. Hänninen, A. Hauptmann, A. Hamilton, S.J. Department of Technical Physics University of Eastern Finland KuopioFI-70210 Finland Faculty of Medicine and Health Technology Tampere University Tampere Finland Department of Mathematical and Statistical Sciences Marquette University MilwaukeeWI53233 United States Research Unit of Mathematical Sciences University of Oulu Oulu Finland Department of Computer Science University College London London United Kingdom

Objective: To develop a fast image reconstruction method for stroke monitoring with electrical impedance tomography with image quality comparable to computationally expensive nonlinear model-based methods. Methods: A post-processing approach with graph convolutional networks is employed. Utilizing the flexibility of the graph setting, a graph U-net is trained on linear difference reconstructions from 2D simulated stroke data and applied to fully 3D images from realistic simulated and experimental data. An additional network, trained on 3D vs. 2D images, is also considered for comparison. Results: Post-processing the linear difference reconstructions through the graph U-net significantly improved the image quality, resulting in images comparable to, or better than, the time-intensive nonlinear reconstruction method (a few minutes vs. several hours). Conclusion: Pairing a fast reconstruction method, such as linear difference imaging, with post-processing through a graph U-net provided significant improvements, at a negligible computational cost. Training in the graph framework vs classic pixel-based setting (CNN) allowed the ability to train on 2D cross-sectional images and process 3D volumes providing a nearly 50x savings in data simulation costs with no noticeable loss in quality. Significance: The proposed approach of post-processing a linear difference reconstruction with the graph U-net could be a feasible approach for on-line monitoring of hemorrhagic stroke. Copyright © 2024, The Authors. All rights reserved.

关键词： Image quality

Comparison of general=purpose events generators for particle fluence simulation in LHC environment

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arXiv 2020年

作者： Oblakowska-Mucha, A. Szumlak, T. Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al. Mickiewicza 30 Krakow30-059 Poland

At the LHC era, the detector systems are operating at the harsh hadronic environment with the unprecedentedly high particle flux. Position sensitive silicon devices are usually positioned at the innermost regions of the experimental setups and must cope with highly non-uniform radiation fields. At the end of LHC Run II, fluence in silicon trackers reached 1015n eq/cm2. Initial simulation studies predict that the maximal fluence for the HL-LHC may be up to two orders of magnitude higher than the one seen in LHC Run I and Run II. In this paper, two general-purpose physics events generators used for simulation of proton-proton collisions at LHC energies: Pythia 8.2 and DPMJET 3, are compared. Fluences obtained using these models, with the latest tuning to the LHC data, in detectors situated close to the point of proton-proton collisions are determined as well. Copyright © 2020, The Authors. All rights reserved.

关键词： High energy physics

Low-temperature perovskites thin films solar cell

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Low-temperature perovskites thin films solar cell

International Conference on Transparent Optical Networks

作者： Anna Zawadzka Agnieszka Marjanowska Amina Laouid Krzysztof Wiśniewki Michał Zawadzki Przemysław Płócennik Institute of Physics Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University Grudziadzka 5 Torun Poland Centre for Modern Interdisciplinary Technologies Nicolaus Copernicus University Wilenska 4 Torun Poland University of Angers MOLTECH-Anjou UMR CNRS 6200 2 Bd. Lavoisier Angers Cedex 01 France National School of Applied Sciences Engineering Science for Energy Laboratory Chouaib Doukkali University of El Jadida El Jadida Morocco Department of Mechanical and Aerospace Engineering Politecnico di Torino Corso Duca Degli Abruzzi 24 Turin Italy Faculty of Power and Aeronautical Engineering Warsaw University of Technology Nowowiejska 24 Warsaw Poland Institute of Engineering and Technology Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University Grudziadzka 5 Torun Poland

ISBN: (数字)9798350377323

ISBN: (纸本)9798350377330

Hybrid organic-inorganic halide perovskites have become the most promising materials in photovoltaics. In just a few years, the energy conversion efficiency of hybrid perovskite solar cells has increased dramatically from an initial bright value of 9% to over 24%. Their remarkable properties, including high carrier mobility, low carrier recombination rate, and tunable spectral absorption range, are attributed to the unique electronic properties of these materials. Despite the undoubted progress in the conversion efficiency of perovskite solar cells, understanding hybrid perovskites’ basic structural, optical, and electrical properties is limited. The presentation will include the research results on the relationship between low-temperature structural, electrical, and optical properties of multifunctional hybrid perovskite thin films produced by the unique physical vapor co-deposition (PVco-D) technique. The experimental study will be compared with theoretical simulations performed using SCAPS 1D software.

关键词： Integrated optics Photovoltaic systems Spontaneous emission Absorption Photovoltaic cells Optical fiber networks Perovskites

Ageing of complex networks

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arXiv 2020年

作者： Burda, Zdzislaw Kotwica, Michalina Malarz, Krzysztof AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakow30-059 Poland

Many real-world complex networks arise as a result of a competition between growth and rewiring processes. Usually the initial part of the evolution is dominated by growth while the later one rather by rewiring. The initial growth allows the network to reach a certain size while rewiring to optimise its function and topology. As a model example we consider tree networks which first grow in a stochastic process of node attachment and then age in a stochastic process of local topology changes. The ageing is implemented as a Markov process that preserves the node-degree distribution. We quantify differences between the initial and aged network topologies and study the dynamics of the evolution. We implement two versions of the ageing dynamics. One is based on reshuffling of leaves and the other on reshuffling of branches. The latter one generates much faster ageing due to non-local nature of changes. Copyright © 2020, The Authors. All rights reserved.

关键词： Complex networks

ATLAS searches for additional scalars and exotic Higgs boson decays with the LHC Run 2 dataset

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physics Reports 2024年 1116卷 184-260页

作者： Aad, G. Aakvaag, E. Abbott, B. Abdelhameed, S. Abeling, K. Abicht, N.J. Abidi, S.H. Aboelela, M. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B.S. Ackermann, A. Adam Bourdarios, C. Adamczyk, 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. Akbiyik, M. Åkesson, T.P.A. Akimov, A.V. Akiyama, D. Akolkar, N.N. Aktas, S. Al Khoury, K. Alberghi, G.L. Albert, J. Albicocco, P. Albouy, G.L. Alderweireldt, S. Alegria, Z.L. 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. Alsolami, Z.M.K. 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. Amirie, K.J. Amor Dos Santos, S.P. Amos, K.R. An, S. Ananiev, V. Anastopoulos, C. Andeen, T. Anders, J.K. Anderson, A.C. Andrean, S.Y. Andreazza, A. Angelidakis, S. Angerami, A. Anisenkov, A.V. Annovi, A. Antel, C. Antipov, E. Antonelli, M. Anulli, F. Aoki, M. Aoki, T. Aparo, M.A. Aperio Bella, L. Appelt, C. Apyan, A. Arbiol Val, S.J. 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. Ashby Pickering, R.A. Assamagan, K. Astalos, R. Astrand, K.S.V. 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. Baer, T.M. Bagnaia, P. Bahmani, M. Bahner, D. Bai, K. Baines, J.T. Baines, L. Baker, O.K. Bakos, E. Bakshi Gupta, D. Balabram Filho, L.E. Balakrishnan, V. Balasubramanian, R. B Department of Physics University of Adelaide Adelaide Australia Department of Physics University of Alberta Edmonton AB Canada Department of Physics Ankara University Ankara Division of Physics TOBB University of Economics and Technology Ankara LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France APC Université Paris Cité CNRS/IN2P3 Paris France High Energy Physics Division Argonne National Laboratory Argonne IL Department of Physics University of Arizona Tucson AZ United States Department of Physics University of Texas at Arlington Arlington TX United States Physics Department National and Kapodistrian University of Athens Athens Greece Physics Department National Technical University of Athens Zografou Greece Department of Physics University of Texas at Austin Austin TX United States Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Institut de Física d'Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain Institute of High Energy Physics Chinese Academy of Sciences Beijing China Physics Department Tsinghua University Beijing China Institute of Physics University of Belgrade Belgrade Serbia Department for Physics and Technology University of Bergen Bergen Norway Physics Division Lawrence Berkeley National Laboratory Berkeley CA United States University of California Berkeley CA United States Institut für Physik Humboldt Universität zu Berlin Berlin Germany Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Department of Physics Bogazici University Istanbul Turkey Department of Physics Engineering Gaziantep University Gaziantep Department of Physics Istanbul University Istanbul Facultad de Ciencias y Centro de Investigaciónes Universidad Antonio Nariño Bogotá Colombia Departamento de Física Universidad Nacional de Colombia

This report reviews the published results of searches for possible additional scalar particles and exotic decays of the Higgs boson performed by the ATLAS Collaboration using up to 140 fb⁻¹ of 13 TeV proton–proton collision data collected during Run 2 of the Large Hadron Collider. Key results are examined, and observed excesses, while never statistically compelling, are noted. Constraints are placed on parameters of several models which extend the Standard Model, for example by adding one or more singlet or doublet fields, or offering exotic Higgs boson decay channels. Summaries of new searches as well as extensions of previous searches are discussed. These new results have a wider reach or attain stronger exclusion limits. New experimental techniques that were developed for these searches are highlighted. Search channels which have not yet been examined are also listed, as these provide insight into possible future areas of exploration. © 2024 The Author(s)

关键词： ATLAS Exotic Higgses Exotic scalars LHC