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Multiparticle azimuthal cumulants from transverse momentum conservation and collective flow

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Physical Review C 2022年第5期105卷 054904-054904页

作者： Mu-Ting Xie Guo-Liang Ma Adam Bzdak Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438 China AGH University of Science and Technology Faculty of Physics and Applied Computer Science 30-059 Kraków Poland

We calculate the nth order of 2k-particle azimuthal cumulants cn{2k} based on transverse momentum conservation (TMC) and collective flow vn (n=2,3). We demonstrate that the TMC effect only leads to a nonzero cn{2k} with the sign of (−1)nk and the magnitude inversely proportional to (N−2k)nk. The interplay between TMC and collective flow can change the signs of c2{4}, c3{2}, and c3{4} at some values of multiplicity N, which could provide a good probe to study the onset of collectivity and search for the substructure of proton in small colliding systems.

关键词： Collective flow Particle correlations & fluctuations Relativistic heavy-ion collisions

Resource theory of Absolute Negativity

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arXiv 2022年

作者： Salazar, Roberto Czartowski, Jakub de Oliveira Junior, A. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków30-348 Poland

A crucial goal of quantum information is to find new ways to exploit the properties of quantum devices as resources. One of the prominent properties of quantum devices of particular interest is their negativity in quasi-probability representations, intensively studied in foundational and practical investigations. In this article, we introduce the concept of Absolute Negativity to characterise the negativity of sets of quantum devices in a basis-independent way. Moreover, we provide a resource theory for our relational notion of Absolute Negativity, which applies to sets of quantum state-measurement pairs. Additionally, we determine a complete hierarchy of upper bounds for resource measures, which allows for estimating the resources of a set of devices. We demonstrate operational interpretations of our resource theory for communication and output-estimation advantages over state-measurement pairs with a classical probability representation. Furthermore, we illustrate the newly introduced concepts with an exhaustive analysis of a simple case of four qubit state-measurement pairs. Finally, we outline possible generalisations, applications and open questions. © 2022, CC BY.

关键词： Quantum optics

TOFHIR2: The readout ASIC of the CMS Barrel MIP Timing Detector

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arXiv 2024年

作者： Albuquerque, E. Araújo, M. Benaglia, A. Boletti, A. Bugalho, R. Coutinho, T. De Guio, F. Faccioli, P. Ferramacho, L. Firlej, M. Fiutowski, T. Francisco, R. Gallinaro, M. Ghezzi, A. Hollar, J. Idzik, M. Legoinha, H. Leonardo, N. Leong, C. Lucchini, M.T. Malberti, M. Marozzo, G. Da Molin, G. Moron, J. Niknejad, T. Oliveira, L. Oliveira, N. Palluotto, S. Pisano, M. Redaelli, N. Silva, C. Silva, J.C. Silva, R. Silveira, M. Swientek, K. Tabarelli de Fatis, T. Tavernier, S. Varela, Joao Varela, V. White, S. Wulff, J. AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland DEE CTS-UNINOVA FCT-UNL Caparica Portugal INFN Sez Bicocca Milano Italy LIP Lisbon Portugal PETsys Electronics Oeiras Portugal University of Milano-Bicocca Milano Italy University of Virginia CharlottesvilleVA United States

The CMS detector will be upgraded for the HL-LHC to include a MIP Timing Detector (MTD). The MTD will consist of barrel and endcap timing layers, BTL and ETL respectively, providing precision timing of charged particles. The BTL sensors are based on LYSO:Ce scintillation crystals coupled to SiPMs with TOFHIR2 ASICs for the front-end readout. A resolution of 30-60 ps for MIP signals at a rate of 2.5 Mhit/s per channel is expected along the HL-LHC lifetime. We present an overview of the TOFHIR2 requirements and design, simulation results and measurements with TOFHIR2 ASICs. The measurements of TOFHIR2 associated to sensor modules were performed in different test setups using internal test pulses or blue and UV laser pulses emulating the signals expected in the experiment. The measurements show a time resolution of 24 ps initially during Beginning of Operation (BoO) and 58 ps at End of Operation (EoO) conditions, matching well the BTL requirements. We also showed that the time resolution is stable up to the highest expected MIP rate. Extensive radiation tests were performed, both with x-rays and heavy ions, showing that TOFHIR2 is not affected by the radiation environment during the experiment lifetime. Copyright © 2024, The Authors. All rights reserved.

关键词： Application specific integrated circuits

Multiparticle azimuthal cumulants from transverse momentum conservation and collective flow

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arXiv 2022年

作者： Xie, Mu-Ting Ma, Guo-Liang Bzdak, Adam Institute of Modern Physics Fudan University Shanghai200433 China Shanghai Research Center for Theoretical Nuclear Physics NSFC Fudan University Shanghai200438 China AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków30-059 Poland

We calculate the nth order of 2k-particle azimuthal cumulants cn{2k} based on transverse momentum conservation (TMC) and collective flow vn(n=2,3). We demonstrate that the TMC effect only leads to a nonzero cn{2k} with the sign of (−1)nk and the magnitude inversely proportional to (N − 2k)nk. The interplay between TMC and collective flow can change the signs of c2{4}, c3{2} and c3{4} at some values of multiplicity N, which could provide a good probe to study the onset of collectivity and search for the substructure of proton in small colliding systems. © 2022, CC0.

关键词： Momentum

Operating Point Shift Induced by Relay Asymmetry: An Iterative Solution Proposal

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Operating Point Shift Induced by Relay Asymmetry: An Iterati...

International Conference on Process Control (PC)

作者： Libor Pekař Radek Matušů Hubert Guzowski František Gazdoš Faculty of Applied Informatics Tomas Bata University in Zlín nám T. G. Masaryka 5555 Zlín Czech Republic Institute of Computer Science AGH University of Science and Technology Krakow Poland

This contribution focuses on a problem that appears when using a relay with non-symmetric output in the closed loop. Such a scheme is usually used for process model parameters identification, possibly followed by automatic controller tuning. Whenever static or dynamic properties of the process reveal asymmetry when the sign of the input changes, the setpoint (reference) becomes different from the operating point value of the process output. As a class of relay-based identification methods utilize calculations in the frequency domain that are based on integral computation around the operating point, the discrepancy between the setpoint and the operating point can lead to incorrect results. The aim of the paper is mainly to provide the reader with problem formulation and step-by-step proposition of how it can be solved. Concise numerical examples are also given. The concluding remarks suggest possible further ways of research.

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Temperature-anisotropy conjugate magnon squeezing in antiferromagnets

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Physical Review B 2023年第14期108卷 144302-144302页

作者： Mahroo Shiranzaei Jonas Fransson Vahid Azimi Mousolou Division of Materials Theory Department of Physics and Astronomy Uppsala University Box 516 SE-75120 Uppsala Sweden Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan 81746-73441 Iran

Quantum squeezing is an essential asset in the field of quantum science and technology. In this paper, we investigate the impact of temperature and anisotropy on squeezing of quantum fluctuations in two-mode magnon states within uniaxial antiferromagnetic materials. Through our analysis, we discover that the inherent nonlinearity in these bipartite magnon systems gives rise to a conjugate magnon squeezing effect across all energy eigenbasis states, driven by temperature and anisotropy. We show that temperature induces amplitude squeezing, whereas anisotropy leads to phase squeezing. In addition, we observe that the two-mode squeezing characteristic of magnon eigenenergy states is associated with amplitude squeezing. This highlights the constructive impact of temperature and the destructive impact of anisotropy on two-mode magnon squeezing. Nonetheless, our analysis shows that the destructive effect of anisotropy is bounded. We demonstrate this by showing that, at a given temperature, the squeezing of the momentum (phase) quadrature [or equivalently, the stretching of the position (amplitude) quadrature] approaches a constant function of anisotropy after a finite value of anisotropy. Moreover, our paper demonstrates that higher magnon squeeze factors can be achieved at higher temperatures, smaller levels of anisotropy, and closer to the Brillouin zone center. All these characteristics are specific to low-energy magnons in the uniaxial antiferromagnetic materials that we examine here.

关键词： Magnons Quantum correlations in quantum information Quantum information processing with continuous variables Quantum information theory Quantum metrology Spin dynamics Spintronics Temperature

physics-informed mode decomposition neural network for structured light in multimode fibers

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Physics-informed mode decomposition neural network for struc...

IEEE Photonics Conference (IPC)

作者： Qian Zhang Yuan Sui Stefan Rothe Jürgen Czarske Chair of Measurement and Sensor System Technique Faculty of Electrical and Computer Engineering TU Dresden Dresden Germany School of Science Institute of Applied Physics TU Dresden

We propose a novel approach for the referenceless mode decomposition of multimode fibers. A deep neural network with the interaction of a physical model achieves decomposition of 55 modes without pre-training. This pa...

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Crystallization kinetics of equimolar liquid crystalline mixture and its components

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arXiv 2024年

作者： Deptuch, Aleksandra Paliga, Anna Drzewicz, Anna Piwowarczyk, Marcin Urbańska, Magdalena Juszyńska-Galązka, Ewa 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 Chemistry Military University of Technology Kaliskiego 2 WarsawPL-00908 Poland Research Center for Thermal and Entropic Science Graduate School of Science Osaka University Osaka560-0043 Japan

The new equimolar mixture comprises liquid crystalline compounds MHPOBC and partially fluorinated 3F2HPhF6. The phase sequence of the mixture is determined by differential scanning calorimetry, polarizing optical microscopy, X-ray diffraction, and broadband dielectric spectroscopy. The enantiotropic smectic A*, C*, and CA* phases are observed for the mixture. Only partial crystallization of the mixture is observed during cooling at 2-40 K/min and the remaining smectic CA* phase undergoes vitrification. In contrast, the crystallization of the pure components is complete or almost complete for the same range of cooling rates. The kinetics of the non-isothermal and isothermal crystallization of the mixture and pure components are investigated by differential scanning calorimetry. The non-isothermal data are analyzed by the isoconversional method, while the isothermal data are analyzed using the Avrami model. Typically, the nucleation-controlled crystallization kinetics are observed. © 2024, CC BY.

关键词： Differential scanning calorimetry

Evolution of phase stresses in Al/SiCp composite during thermal cycling and compression test studied using diffraction and self-consistent models

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Journal of Materials science & Technology 2020年第1期36卷 176-189页

作者： Przemyslaw Kot Andrzej Baczmański Elzbietaa Gadalińska Sebastian Wroński Marcin Wroński Miroslaw Wróbel Gizo Bokuchava Christian Scheffzük Krzysztof Wierzbanowski AGH University of Science and Technology Faculty of Physics and Applied Computer Scienceal.Mickiewicza 3030-059 Krakow.Poland Institute of Aviation Materials&Structures Research Centeral.Krakowska 110/11402-256 WarsawPoland AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Scienceal.Mickiewicza 3030-059 KrakowPoland Joint Institute for Nuclear Research Frank Laboratory of Neutron PhysicsJoliot-Curie 6141980 DubnaRussia Karlsruhe Institute of Technology Institute of Applied GeosciencesAdenauerring 20b76131 KarlsruheGermany

In this work,the evolutions of stresses in both phases of the Al/SiCp composite subjected to thermal cycling during in situ compression test were measured using Time of Flight neutron *** was confirmed that inter-phase stresses in the studied composite can be caused by differences in the coefficient of thermal expansion for the reinforcement and matrix,leading to a different variation of phase volumes during sample heating or *** results of the diffraction experiment during thermal cycling were well predicted by the Thermo-Mechanical Self-Consistent *** experimental study of elastic-plastic deformation was carried out in situ on a unique diffractometer EPSILON-MDS(JINR in Dubna,Russia)with nine detector banks measuring interplanar spacings simultaneously in 9 orientations of scattering *** the first time,the performed analysis of experimental data allowed to study the evolution of full stress tensor in both phases of the composite and to consider the decomposition of this tensor into deviatoric and hydrostatic *** was found that the novel Developed Thermo-Mechanical SelfConsistent model correctly predicted stress evolution during compressive loading,taking into account the relaxation of thermal origin hydrostatic *** comparison of this model with experimental data at the macroscopic level and the level of phases showed that strengthening of the Al/SiCp composite is caused by stress transfer from the plastically deformed A12124 matrix to the elastic SiCp reinforcement,while thermal stresses relaxation does not significantly affect the overall composite properties.

关键词： Stress relaxation Strengthening mechanism Plastic deformation Multiscale model Metal matrix composites Neutron diffraction