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arXiv 2023年

作者： Shiranzaei, Mahroo Fransson, Jonas Mousolou, Vahid Azimi Division of Materials Theory Department of Physics and Astronomy Uppsala University Box 516 UppsalaSE-75120 Sweden Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan81746-73441 Iran

Quantum squeezing is an essential asset in the field of quantum science and technology. In this study, 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 study 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. © 2023, CC0.

关键词： Anisotropy

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High-temperature Fatigue and Creep Performance of Additively Manufactured NiCu-based Alloy

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Procedia Structural Integrity 2024年 52卷 143-153页

作者： Ivo Šulák Alice Chlupová Tomáš Záležák Ivo Kuběna Jan-Philipp Roth Katrin Jahns Ulrich Krupp Tomáš Kruml Institute of Physics of Materials Czech Academy of Sciences Žižkova 22 616 00 Brno Czech Republic Faculty of Engineering and Computer Science Osnabrück University of Applied Sciences Albrechtstr. 30 49076 Osnabrück Germany Steel Institute IEHK RWTH Aachen University Intzestraße 1 52072 Aachen Germany

NiCu-based alloys are frequently employed as a key material for heat exchangers and superheated steam systems where the emphasis is put on the resistance against metal dusting and corrosion in harsh environments and, at the same time, excellent mechanical properties at elevated temperatures. The present contribution delivers the experimental results on high-temperature fatigue and creep performance of additively manufactured NiCu-based Alloy 400 and compares it with conventionally produced material. The fatigue tests were performed in symmetrical force control loading in laboratory air at elevated temperatures. Standard constant stress uniaxial creep tests were carried out up to the rupture at applied stresses ranging from 30 to 150 MPa and temperatures between 600–880°C in a protective argon atmosphere. Results indicate inferior fatigue and creep properties of additively manufactured Alloy 400. This detrimental effect of the manufacturing process on mechanical properties can be caused by several factors, including the orientation of the building direction relative to the loading direction, strong texture in 〈011〉 direction, and also by the presence of defects revealed by means of scanning electron microscopy on fracture surfaces of additively manufactured materials.

关键词： Additive manufacturing Alloy 400 fatigue lifetime creep behaviour electron microscopy

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Effect of growth time on the structural and morphological properties of MoS2 synthesized via hydrothermal method 5th

Effect of growth time on the structural and morphological pr...

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5th International Conference on Functional Materials science, ICFMS 2020

作者： Emrinaldi, Tengku Imawan, Cuk Ginting, Riski Titian Fauzia, Vivi Department of Physics Faculty of Mathematics and Natural Sciences University of Indonesia Depok16424 Indonesia Department of Physics Faculty of Mathematics and Natural Sciences University of Riau Pekanbaru28295 Indonesia Department of Electrical Engineering Faculty of Technology and Computer Science Prima University of Indonesia Medan20118 Indonesia

ISBN: (纸本)9783035718690

Recently, molybdenum disulfide (MoS2), have been explored as photothermal materials for solar evaporation. However, the optimum phase for photothermal material, 1T-MoS2 or 2H-MoS2, is still debatable. In this work, we observed the morphological and structural properties of MoS2 prepared by a simple hydrothermal process at 200 °C in three different growth times (16, 20, and 24 hours) using Na2MoO4·2H2O (sodium molybdate) as a Mo precursor, and CS(NH2)2 (thiourea) as S precursor. MoS2 nanoflowers were successfully prepared with nanosheets petals and its diameter increased from 0.4 to 2.8 and 4.5 μm as the growth time increased from 16 to 20 and 24 hours. The increase in growth time also led to improve the Mo:S ratio from 1:8 to 1:5 and facilitate the phase transformation from 1T to 2H as indicated by the shifting of (002) diffraction peak from 9.25° to higher degrees (12.98°, and 14.12°). © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Molybdenum disulfide

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Research on reversible functions having component functions with specified properties: An overview 12th

Research on reversible functions having component functions ...

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12th International Conference on Reversible Computation, RC 2020

作者： Kerntopf, Pawel Moraga, Claudio Podlaski, Krzysztof Stanković, Radomir Institute of Computer Science Warsaw University of Technology Warsaw Poland Faculty of Computer Science Technical University of Dortmund Dortmund Germany Faculty of Physics and Applied Informatics University of Lódź Lódź Poland Department of Computer Science Faculty of Electronic Engineering University of Niš Niš Serbia

ISBN: (纸本)9783030473600

In the traditional logic synthesis, different classifications of non-reversible Boolean functions have found many applications. Recently, some attempts to deal with classifications of reversible functions have been published. In this paper, an overview of our results towards constructing a new classification of reversible functions is presented. These results were obtained due to our discussions during two Short Term Scientific Missions (STSMs) as well as during our further research in the framework of COST Action IC1405 "Reversible Computation - Extending Horizons of Computing" and were published in five papers. © The Author(s) 2020.

关键词： Logic Synthesis

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Signals Features Extraction in Radioisotope Liquid-Gas Flow Measurements using Autocorrelation Function

Signals Features Extraction in Radioisotope Liquid-Gas Flow ...

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International Conference on Control, Decision and Information Technologies (CoDIT)

作者： Robert Hanus Marcin Zych Anna Golijanek-Jé drzejczyk Faculty of Electrical and Computer Engineering Rzesz&#x00F3 w University of Technology Rzeszow Poland Faculty of Geology Geophysics and Environmental Protection AGH University of Science and Technology Krak&#x00F3 w Poland Faculty of Electrical and Control Engineering Gda&#x0144 sk University of Technology Gda&#x0144 sk Poland

Knowledge of the two-phase flow structure is essential for the proper conduct of industrial processes. Description of liquid-gas flow regimes is possible by using of data analysis in time, frequency, or state-space domain. In this research studies, the autocorrelation function is applied for analysis of signals obtained for liquid-gas flow by use gamma-ray absorption. The experiments were carried out on the laboratory hydraulic installation fitted with Am-241 radioactive source and scintillation probe with NaI(Tl) crystal. Four types of flow regimes as plug, slug, bubble, and transitional plug - bubble were studied in this work. It was found that the selected amplitudes of the normalized autocorrelation function are helpful to recognize the flow regime.

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Analysis of capability of detection of extensive air showers by simple scintillator detectors 37

Analysis of capability of detection of extensive air showers...

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37th International Cosmic Ray Conference, ICRC 2021

作者： Pryga, Jerzy Stanek, Weronika Homola, Piotr Wibig, Tadeusz Sushchov, Oleksandr Kovacs, Peter Nazari, Vahab Zamora-Saa, Jilberto Beznosko, Dmitriy Medvedev, Mikhail V. Stasielak, Jaroslaw Lozowski, Bartosz Budnev, Nikolai Gupta, Alok C. Tursunov, Arman Smolek, Karel Hnatyk, Bohdan Alvarez Castillo, David E. Smelcerz, Katarzyna Mozgova, Alona Niedźwiecki, Michal Kasztelan, Marcin Rosas, Matías Rzecki, Krzysztof Stuglik, Slawomir Jagiellonian University Golębia 24 Kraków31-007 Poland AGH University of Science and Technology Mickiewicz Ave. Kraków30-059 Poland Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Kraków31-342 Poland Irkutsk State University Russia Manora Peak Nainital263001 India Astronomical Observatory of Taras Shevchenko National University of Kyiv Kyiv04053 Ukraine National Centre for Nuclear Research Andrzeja Soltana 7-Świerk Otwock05-400 Poland Institute for Particle and Nuclear Physics Wigner Research Centre for Physics Konkoly-Thege Miklós út 29-33 Budapest1121 Hungary Faculty of Natural Sciences University of Silesia in Katowice Bankowa 9 Katowice40-007 Poland Department of Physics and Astronomy University of Kansas LawrenceKS66045 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Computer Science Faculty of Computer Science and Telecommunications Cracow University of Technology Warszawska 24 Kraków31-155 Poland Liceo 6 Francisco Bauzá Montevideo Uruguay Institute of Experimental and Applied Physics Czech Technical University in Prague Czech Republic Joint Institute for Nuclear Research Dubna141980 Russia Research Centre for Theoretical Physics and Astrophysics Institute of Physics Silesian University in Opava Bezručovo nám. 13 OpavaCZ-74601 Czech Republic University of Lódź Faculty of Physics and Applied Informatics Pomorska 149/153 Lódź90-236 Poland Universidad Andres Bello Departamento de Ciencias Fisicas Facultad de Ciencias Exactas Avenida Republica 498 Santiago Chile

One of the main objectives of the CREDO project is to search for so-called Cosmic-Ray Ensembles (CRE) [1]. To confirm the existence of such phenomena a massive scale observation of even relatively low energy Extensive Air Showers (EAS) and an analysis of their correlations in time must be performed. To make such observations possible, an infrastructure of widely spread detectors connected in a global network should be developed using low-cost devices capable of collecting data for a long period of time. For each of these detectors or small detector systems the probability of detection of an EAS has to be determined. Such information is crucial in the analysis and interpretation of collected data. In the case of large number of systems with different properties the standard approach based on detailed and extensive simulations is not possible, thus a faster method is developed. Knowing the characteristics of EAS from more general simulations any required probability is calculated using appropriate parameterization taking into account EAS spectrum, energy dependence of particle density and zenith angle dependence. This allows to estimate expected number of EAS events measured by a set of small detectors [2] and compare results of calculations with these measurements. © 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： Cosmic rays

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Invitation to the Cosmic Ray Extremely Distributed Observatory 37

Invitation to the Cosmic Ray Extremely Distributed Observato...

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37th International Cosmic Ray Conference, ICRC 2021

作者： Homola, Piotr Alvarez Castillo, David E. Cheminant, Kevin Almeida Beznosko, Dmitriy Budnev, Nikolai Góra, Dariusz Gupta, Alok C. Hnatyk, Bohdan Kasztelan, Marcin Kovacs, Peter Lozowski, Bartosz Medvedev, Mikhail V. Miszczyk, Justyna Mozgova, Alona Nazari, Vahab Niedźwiecki, Michal Pawlik, Maciej Rosas, Matías Rzecki, Krzysztof Smelcerz, Katarzyna Smolek, Karel Stasielak, Jaroslaw Stuglik, Slawomir Sushchov, Oleksandr Svanidze, Manana Tursunov, Arman Vaquero, Jose M. Verbetsky, Yuri Wibig, Tadeusz Woźniak, Krzysztof Zamora-Saa, Jilberto Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Kraków31-342 Poland Joint Institute for Nuclear Research Dubna141980 Russia Clayton State University MorrowGA United States Irkutsk State University Russia Manora Peak Nainital263001 India Astronomical Observatory of Taras Shevchenko National University of Kyiv Kyiv04053 Ukraine National Centre for Nuclear Research Andrzeja Soltana 7Świerk Otwock05-400 Poland Institute for Particle and Nuclear Physics Wigner Research Centre for Physics 1121 Konkoly-ThegeMiklósút Budapest29-33 Hungary Faculty of Natural Sciences University of Silesia in Katowice Bankowa 9 Katowice40-007 Poland Department of Physics and Astronomy University of Kansas LawrenceKS66045 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Computer Science Faculty of Computer Science and Telecommunications Cracow University of Technology Warszawska 24 Kraków31-155 Poland ACC Cyfronet AGH-UST Kraków30-950 Poland AGH University of Science and Technology Mickiewicz Ave. Kraków30-059 Poland Liceo 6 Francisco Bauzá Montevideo Uruguay Institute of Experimental and Applied Physics Czech Technical University Prague Czech Republic E. Andronikashvili Institute of Physics Tbilisi State University Georgia Research Centre for Theoretical Physics and Astrophysics Institute of Physics Silesian University in Opava Bezručovo nám. 13 OpavaCZ-74601 Czech Republic Department of Physics University of Extremadura Mérida06800 Spain University of Lódź Faculty of Physics and Applied Informatics Pomorska 149/153 Lódź90-236 Poland Universidad Andres Bello Departamento de Ciencias Fisicas Facultad de Ciencias Exactas Avenida Republica 498 Santiago Chile

Cosmic Ray Ensembles (CRE) are very large, yet not observed particle cascades initiated above the Earth atmosphere. Such cascades could be formed both within classical models (e.g. products of photon-photon interactions) and exotic scenarios (e.g. result of decay of Super Heavy Dark Matter particles and subsequent interactions). Some of CRE might have a significant spatial extent which could serve as a unique signature detectable with the existing cosmic ray infrastructure taken as a network of detectors. This signature would be composed of a number of air showers with parallel axes. An obvious, although yet not probed, CRE „detection horizon" can be located somewhere between an air shower induced by an CRE composed of tightly collimated particles (preshower effect), and undetectable CRE composed of particles spread so widely that only one of them have a chance to reach Earth. Probing the CRE horizon with a global approach to the cosmic ray data, as proposed by the newly formed Cosmic Ray Extremely Distributed Observatory (CREDO), defines an extensive scientific program oriented on the search for physics manifestations at largest energies known, with potential impact on ultra-high energy astrophysics, the physics of fundamental particle interactions and cosmology. In this talk the current status and perspectives of CREDO will be summarized, with an open invitation for the colleagues interested in a global approach to cosmic ray studies, and in particular in observing and investigating multi-primary cosmic ray events such as CRE. © 2022 Sissa Medialab Srl. All rights reserved.

关键词： Cosmic rays

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Mössbauer investigations of the FeCoNiPdx and CrxFeCoNiPd high entropy alloys

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Journal of Magnetism and Magnetic Materials 2021年 518卷 167371-167371页

作者： Cieslak, J. Calvo-Dahlborg, M. Berent, K. Dahlborg, U. AGH University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 Cracow30-059 Poland GPM CNRS-UMR6634 University of Rouen Normandie St-Etienne-du-Rouvray76801 France AGH University of Science and Technology Academic Centre for Materials and Nanotechnology Al. Mickiewicza 30 Cracow30-059 Poland

Two series of FeCoNiPdx and CrxFeCoNiPd high entropy alloys were investigated using SEM-EDX, XRD technique and Mössbauer spectroscopy. Increasing of Pd content in the FeCoNiPdx samples only slightly influenced the Mössbauer spectra. They were analysed assuming simultaneous presence of hyperfine field and quadrupole splitting distributions, however random direction of observation relative to Bhf and EFG caused the average QS value to be close to zero. Increasing of Cr content in the CrxFeCoNiPd samples resulted in strong decrease of the hyperfine field, its distribution becomes wide and influence of Bhf,ISBhf and EFG on the Mössbauer spectra can not be separated unambiguously. The decomposing of the HEAs compositions into binary artificial Fe-dopant systems, namely [FeCoNi]-Pd and [FeCoNiPd]-Cr, allowed to interpret the magnetic structure of the two investigated series. © 2020 Elsevier B.V.

关键词： Cobalt alloys

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Design of 3D-Printed Lens for Ultra-Wideband Flower-Shaped Stub Antenna

Design of 3D-Printed Lens for Ultra-Wideband Flower-Shaped S...

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International ECTI Northern Section Conference on Electrical, Electronics, computer and Telecommunications Engineering (ECTI-NCON)

作者： Patchadaporn Sangpet Nonchanutt Chudpooti Prayoot Akkaraekthalin Wanwisa Thaiwirot Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Appied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand

The design of 3D-printed lens for ultra-wideband (UWB) slot antenna with flower-shaped stub is presented. This research presents four types of lenses with different shapes i.e., cone lens, semicircle lens, Fresnel lens and hemispherical lens that are mounted on an UWB planar antenna. The effect of these lenses on reflection coefficient, gain, and radiation pattern is proposed. The simulation results show that all four lenses, which are combined with an UWB planar antenna. The operating band of the designed antenna starts at 3.1 GHz to 10.6 GHz. Moreover, using these lenses, the antenna characteristics, e.g., antenna gain, and antenna radiation patterns are enhanced. The average gain at zero degree of the antenna without a lens is 1.94 dBi, while the average gain at the same angle of the antenna with four types of lenses are increased more than 1.1 dBi. Four shaped of the lens, e.g., cone, semicircle, Fresnel, and hemispherical, are selected to modify the gain and radiation pattern of UWB flower-shaped stub antenna. After implement the lens, the gains of the antenna at zero degree are increased to 3.09 dBi, 3.35 dBi, 3.72 dBi, and 5.07 dBi, respectively. In addition, the radiation pattern of the antenna without an additive lens is bi-directional pattern, but when adding a lens, the radiation pattern changes to a unidirectional one. It is found that a hemispherical lens is a good choice for the proposed antenna because it has a higher gain than other lenses. Furthermore, this study is useful for lens selection to enhance UWB antenna performance.

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Modified diatomite materials and their environmental application as a sorbent for inorganic ions

Modified diatomite materials and their environmental applica...

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International Multidisciplinary Conference on computer and Energy science (SpliTech)

作者： Michał Łach Tomasz Bajda Magdalena Szechyńska-Hebda Marek Hebda Faculty of Materials Engineering and Physics Cracow University of Technology Cracow Poland Department of Geology Geophysics and Environmental Protection AGH University of Science and Technology Cracow Poland Molecular Biogeography and Systematics Group W. Szafer Institute of Botany Polish Academy of Sciences Cracow Poland

The studies aimed at the technology for the production of highly effective sorbents which are based on the natural mineral named diatomite. Diatomite is commonly derived in many regions around the world. In Poland, geological analysis was applied to find at least 4 large deposits of diatomite material. One of the diatomite earth mines is situated in an area of Jawornik Ruski in the southern part of Poland. The quantity of diatomite in the deposit was calculated at approximately 10 million tons, therefore its large-scale application can be not only locally, but even globally. In the last few years, diatomite was studied in the order of technological use, e.g. for industry, plant breeding, and different sectors of agriculture. In this article, we present the application potential of diatomite material. At least, diatomite can be efficiently applied to eliminate various toxic spills as a whole and different hazardous substance dissolved in environmental waters. Our results of the analysis also showed economic importance, as the production of good quality sorbents based on locally accessible raw materials could reduce transportation energy and costs, and therefore greatly lower the environmental pressure. Further, the usage of sorbents with improved efficiency can reduce the total quantity of employed raw materials and then lower the amount of sorbents soaked with waste and their recycling. However, the most important step, before the implementation of the final functional material in practice, is a series of analyses that should be carried out to optimize suitable processing parameters for raw material. We present the results of physical and chemical analyses of Jawornik Ruski’s diatomite and its great absorption/desorption properties against inorganic chemicals. Further, the effect of grain fraction size of diatomite material and its modification method on the sorption/desorption properties against ${\text{P}}{{\text{O}}_4}^{3 - }$, NO 3− , ${\text{SO}}_4^{2 - }$ ions

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