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arXiv 2018年

作者： Andrzejewski, K. Prencel, S. Department of Computer Science Faculty of Physics and Applied Informatics University of Lodz Pomorska 149/153 Lodz90-236 Poland

We discuss in some detail the interaction of classical particles, including the scattering and memory effect, with a pulse of gravitational plane wave. The key point is the conformal symmetry of gravitational plane waves. In particular, we obtain, in the limit of short pulse, some results for impulsive gravitational waves. Furthermore, in the general case, we give certain conditions which allow us to completely describe the interaction in terms of the singular Baldwin-Jeffery-Rosen coordinates. Copyright © 2018, The Authors. All rights reserved.

关键词： Elastic waves

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Searches for neutrinos in the direction of radio-bright blazars with the ANTARES telescope

arXiv

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arXiv 2023年

作者： Albert, A. Alves, S. André, M. Ardid, M. Ardid, S. Aubert, J.-J. Aublin, J. Baret, B. Basa, S. Becherini, Y. Belhorma, B. Bendahman, M. Benfenati, F. Bertin, V. Biagi, S. Bissinger, M. Boumaaza, J. Bouta, M. Bouwhuis, M.C. Branzaş, H. Bruijn, R. Brunner, J. Busto, J. Caiffi, B. Calvo, D. Campion, S. Capone, A. Caramete, L. Carenini, F. Carr, J. Carretero, V. Celli, S. Cerisy, L. Chabab, M. Moursli, R. Cherkaoui El Chiarusi, T. Circella, M. Coelho, J.A.B. Coleiro, A. Coniglione, R. Coyle, P. Creusot, A. Cruz, A.S.M. Díaz, A.F. De Martino, B. Distefano, C. Di Palma, I. Domi, A. Donzaud, C. Dornic, D. Drouhin, D. Eberl, T. van Eeden, T. van Eijk, D. Hedri, S. El Khayati, N. El Enzenhöfer, A. Fermani, P. Ferrara, G. Filippini, F. Fusco, L. Gagliardini, S. García, J. Oliver, C. Gatius Gay, P. Geißelbrecht, N. Glotin, H. Gozzini, R. Ruiz, R. Gracia Graf, K. Guidi, C. Haegel, L. Hallmann, S. van Haren, H. Heijboer, A.J. Hello, Y. Hernández-Rey, J.J. Hößl, J. Hofestädt, J. Huang, F. Illuminati, G. James, C.W. Jisse-Jung, B. de Jong, M. de Jong, P. Kadler, M. Kalekin, O. Katz, U. Kouchner, A. Kreykenbohm, I. Kulikovskiy, V. Lahmann, R. Lamoureux, M. Lazo, A. Lefèvre, D. Leonora, E. Levi, G. Le Stum, S. Lopez-Coto, D. Loucatos, S. Maderer, L. Manczak, J. Marcelin, M. Margiotta, A. Marinelli, A. Martínez-Mora, J.A. Migliozzi, P. Moussa, A. Muller, R. Navas, S. Nezri, E. Fearraigh, B.Ó. Oukacha, E. Paun, A. Pavalaş, G.E. Pena-Martínez, S. Perrin-Terrin, M. Pestel, V. Piattelli, P. Poirè, C. Popa, V. Pradier, T. Randazzo, N. Real, D. Reck, S. Riccobene, G. Romanov, A. Sánchez-Losa, A. Saina, A. Greus, F. Salesa Samtleben, D.F.E. Sanguineti, M. Sapienza, P. Schnabel, J. Schumann, J. Schüssler, F. Seneca, J. Spurio, M. Stolarczyk, Th. Taiuti, M. Tayalati, Y. Tingay, S.J. Vallage, B. Vannoye, G. Van Elewyck, V. Viola, S. Vivolo, D. Wilms, J. Zavatarelli, S. Zegarelli, A. Zornoza, J.D. Zúniga, J. Kovalev, Y.A. Kovalev, Y.Y. Plavin, A.V. Pushkarev, A.B. Troitsky, S.V. Hovatta, T. Kiehlmann, S. Liodakis, I. Pavlidou, V. Readhead, A Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France Université de Haute Alsace MulhouseF-68100 France c/ Catedrático José Beltrán Paterna Valencia2 E-46980 Spain Technical University of Catalonia Laboratory of Applied Bioacoustics Rambla Exposició Vilanova i la Geltrú Barcelona08800 Spain Universitat Politècnica de València C/ Paranimf 1 Gandia46730 Spain Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Universite Paris Cite CNRS Astroparticule et Cosmologie ParisF-75013 France Aix Marseille Univ CNRS CNES LAM Marseille France National Center for Energy Sciences and Nuclear Techniques B.P.1382 R. P. Rabat10001 Morocco Universit Mohammed V in Rabat Facult of Sciences 4 av Ibn Battouta B P 1014 R P 10000 Morocco INFN Sezione di Bologna Viale Berti-Pichat 6/2 Bologna40127 Italy Dipartimento di Fisica e Astronomia dell’Università di Bologna Viale Berti-Pichat 6/2 Bologna40127 Italy Via S. Sofia 62 Catania95123 Italy Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics Erwin-Rommel-Str. 1 Erlangen91058 Germany University Mohammed I Laboratory of Physics of Matter and Radiations B.P.717 Oujda6000 Morocco Nikhef Science Park Amsterdam Netherlands Institute of Space Science Magurele BucharestRO-077125 Romania Universiteit van Amsterdam Instituut voor Hoge-Energie Fysica Science Park 105 Amsterdam1098 XG Netherlands INFN - Sezione di Genova Via Dodecaneso 33 Genova16146 Italy INFN - Sezione di Roma P.le Aldo Moro 2 Roma00185 Italy Dipartimento di Fisica dell’Università La Sapienza P.le Aldo Moro 2 Roma00185 Italy LPHEA Faculty of Science - Semlali Cadi Ayyad University MarrakechP.O.B. 2390 Morocco INFN - Sezione di Bari Via E. Orabona 4 Bari70126 Italy International Centre for Radio Astronomy Research - Curtin University BentleyWA6102 Australia Department of Computer Architecture and Technology CITIC University of Granada Granada18071 Spain Université

Active galaxies, especially blazars, are among the most promising neutrino source candidates. To date, ANTARES searches for these objects considered GeV-TeV γ-ray bright blazars. Here, a statistically complete radio-bright blazar sample is used as the target for searches of origins of neutrinos collected by the ANTARES neutrino telescope over 13 years of operation. The hypothesis of a neutrino-blazar directional correlation is tested by pair counting and by a complementary likelihood-based approach. The resulting post-trial p-value is 3.0% (2.2σ in the two-sided convention), possibly indicating a correlation. Additionally, a time-dependent analysis is performed to search for temporal clustering of neutrino candidates as a mean of detecting neutrino flares in blazars. None of the investigated sources alone reaches a significant flare detection level. However, the presence of 18 sources with a pre-trial significance above 3σ indicates a p = 1.4% (2.5σ in the two-sided convention) detection of a time-variable neutrino flux. An a posteriori investigation reveals an intriguing temporal coincidence of neutrino, radio, and γ-ray flares of the J0242+1101 blazar at a p = 0.5% (2.9σ in the two-sided convention) level. Altogether, the results presented here suggest a possible connection of neutrino candidates detected by the ANTARES telescope with radio-bright blazars. Copyright © 2023, The Authors. All rights reserved.

关键词： Telescopes

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Dark Energy Survey Year 3 results: imprints of cosmic voids and superclusters in the Planck CMB lensing map

arXiv

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arXiv 2022年

作者： Kovács, Andras Vielzeuf, P. Ferrero, I. Fosalba, P. Demirbozan, U. Miquel, R. Chang, C. Hamaus, N. Pollina, G. Bechtol, K. Becker, M. Carnero Rosell, A. Carrasco Kind, M. Cawthon, R. Crocce, M. Drlica-Wagner, A. Elvin-Poole, J. Gatti, M. Giannini, G. Gruendl, R.A. Porredon, A. Ross, A.J. Rykoff, E.S. Sevilla-Noarbe, I. Sheldon, E. Yanny, B. Abbott, T. Aguena, M. Allam, S. Annis, J. Bacon, D. Bernstein, G. Bertin, E. Bocquet, S. Brooks, D. Burke, D. Carretero, J. Castander, F.J. Costanzi, M. da Costa, L.N. Pereira, M.E.S. De Vicente, J. Desai, S. Diehl, H.T. Dietrich, J. Ferté, A. Flaugher, B. Frieman, J. Garcia-Bellido, J. Gaztañaga, E. Gerdes, D. Giannantonio, T. Gruen, D. Gschwend, J. Gutierrez, G. Hinton, S. Hollowood, D.L. Honscheid, K. Huterer, D. Kuehn, K. Lahav, O. Lima, M. March, M. Marshall, J. Melchior, P. Menanteau, F. Morgan, R. Muir, J. Ogando, R. Palmese, A. Paz-Chinchon, F. Pieres, A. Plazas Malagón, A. Rodriguez Monroy, M. Roodman, A. Sanchez, E. Schubnell, M. Serrano, S. Smith, M. Suchyta, E. Tarle, G. Thomas, D. To, C.-H. Varga, T.N. Weller, J. Calle Vía Láctea Tenerife La LagunaE-38200 Spain Tenerife La LagunaE-38206 Spain Aix-Marseille Univ CNRS IN2P3 CPPM Marseille France Institute of Theoretical Astrophysics University of Oslo P.O. Box 1029 Blindern OsloNO-0315 Norway Barcelona08034 Spain Campus UAB Carrer de Can Magrans s/n Barcelona08193 Spain The Barcelona Institute of Science and Technology Campus UAB Bellaterra08193 Spain Institució Catalana de Recerca i Estudis Avançats Barcelona Spain Department of Astronomy and Astrophysics University of Chicago ChicagoIL60637 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Universitäts-Sternwarte Fakultät für Physik Ludwig-Maximilians Universität München Scheinerstr. 1 München81679 Germany Physics Department 2320 Chamberlin Hall University of Wisconsin-Madison 1150 University Avenue MadisonWI53706-1390 United States Argonne National Laboratory 9700 South Cass Avenue LemontIL60439 United States Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. UrbanaIL61801 United States Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States Physics Department William Jewell College LibertyMO64068 United States Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Center for Cosmology and Astro-Particle Physics The Ohio State University ColumbusOH43210 United States Department of Physics The Ohio State University ColumbusOH43210 United States Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Madrid Spain Brookhaven National Laboratory Bldg 510 UptonNY11973 United States Cerro Tololo Inter-American Observatory NSF's National Optical-Infrared Astronomy Research Laboratory Casilla 603 La Serena Chile L

The CMB lensing signal from cosmic voids and superclusters probes the growth of structure in the low-redshift cosmic web. In this analysis, we cross-correlated the Planck CMB lensing map with voids detected in the Dark Energy Survey Year 3 (Y3) data set (∼5,000 deg2), expanding on previous measurements that used Y1 catalogues (∼1,300 deg2). Given the increased statistical power compared to Y1 data, we report a 6.6σ detection of negative CMB convergence (K) imprints using approximately 3,600 voids detected from a redMaGiC luminous red galaxy sample. However, the measured signal is lower than expected from the MICE N-body simulation that is based on the ΛCDM model (parameters Ωm = 0.25, σ8 = 0.8), and the discrepancy is associated mostly with the void centre region. Considering the full void lensing profile, we fit an amplitude AK = KDES/KMICE to a simulation-based template with fixed shape and found a moderate 2σ deviation in the signal with AK ≈ 0.79 ± 0.12. We also examined the WebSky simulation that is based on a Planck 2018 ΛCDM cosmology, but the results were even less consistent given the slightly higher matter density fluctuations than in MICE. We then identified superclusters in the DES and the MICE catalogues, and detected their imprints at the 8.4σ level;again with a lower-than-expected AK = 0.84 ± 0.10 amplitude. The combination of voids and superclusters yields a 10.3σ detection with an AK = 0.82 ± 0.08 constraint on the CMB lensing amplitude, thus the overall signal is 2.3σ weaker than expected from MICE. © 2022, CC BY.

关键词： Surveys

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Niederer's transformation, time-dependent oscillators and polarized gravitational waves

arXiv

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arXiv 2018年

作者： Andrzejewski, K. Prencel, S. Department of Computer Science Faculty of Physics and Applied Informatics University of Lodz Pomorska 149/153 Lodz90-236 Poland

It is noted that the Niederer transformation can be used to find the explicit relation between time-dependent linear oscillators, including the most interesting case when one of them is harmonic. A geometric interpretation of this correspondence is provided by certain subclasses of pp-waves;in particular the ones strictly related to the proper conformal transformations. This observation allows us to show that the pulses of plane gravitational wave exhibiting the maximal conformal symmetry are analytically solvable. Particularly interesting is the circularly polarized family for which some aspects (such as the classical cross section, velocity memory effect and impulsive limit) are discussed in more detail. The role of the additional integrals of motion, associated with the conformal generators, is clarified by means of Ermakov-Lewis invariants. Possible applications to the description of interaction of electromagnetic beams with matter are also indicated. Copyright © 2018, The Authors. All rights reserved.

关键词： Conformal mapping

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Spin separation and exchange for quantum dots in the Overhauser field

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Physical Review B 2017年第19期95卷 195302-195302页

作者： J. Leśnicki B. Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

We describe spin and charge dynamics of the system of two electrons confined within a double quantum dot defined in a quantum wire. The spin dynamics is driven by the electron motion in the presence of the spin-orbit interaction and the randomly varying local Overhauser field due to the nuclear spins. The Schroedinger equation is solved with the time-dependent configuration interaction method that allows for an exact description of the system dynamics. The procedures of the spin separation, exchange and read-out by the spin to charge conversion all induced by the detuning variation are simulated. The rates of the potential variation that are necessary for the spin separation and spin to charge conversion in the context of the Landau-Zener transitions are determined. The average over random configurations of the hyperfine field produces spin exchange results which qualitatively agree with the experimental data.

关键词： Coulomb blockade Spin polarization

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Hot air treatment: Alternative annealing of TiO2 nanoparticulate films without substrate deformation

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AIP Conference Proceedings 2020年第1期2279卷

作者： Arisara Panthawan Winai Thongpan Porntipa Pooseekheaw Nidchamon Jumrus Tewasin Kumpika Wattikon Sroila Ekkapong Kantarak Panupong Sanmuangmoon Adisorn Tuantranont Wiradej Thongsuwan Pisith Singjai 1PhD’s Degree Program in Materials Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand 3Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand 2Center of Excellence in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand 4Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand 5Thailand Organic and Printed Electronics Innovation Center National Electronics and Computer Technology Center National Science and Technology Development Agency (Klong Luang Pathumthani 12120 Thailand) 6Center of Advanced Materials of Printed Electronics and Sensors Materials Science Research Center Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

Titanium dioxide (TiO2) nanoparticulate films was successfully annealed on a glass substrate via alternative hot air treatment (HAT). Interestingly, HAT not only protects the glass substrate deformation but can also reduce cost and time in the annealing process. The annealed films using HAT at 500 °C for 10 min can be compared with the annealed films in conventional furnace heat treatment (FHT) at 500 °C for 60 min. The results showed the sizes of ∼7.9 nm are obtained after the films annealed with both annealing techniques. The surface roughness of the as-deposited, the annealed films using FHT and HAT were 17.37, 23.74 and 23.26 nm, respectively. The energy band gap of the as- deposited films, the annealed films using FHT and HAT were 3.24 eV, 3.1 and 3.19 eV, respectively. Moreover, the annealed films using FHT and HAT techniques show superhydrophilic with a water contact angle of 3.42° and 2.81°, while the as-deposited films was 8.93°. After aging time testing, superhydrophilicity of the annealed films using HAT is greater than FHT. The result is in good agreement with Ti wt% of the as-deposited, the annealed films using FHT and HAT left on the substrate to 0.15, 0.73 and 0.65 nm after testing simulation for 20 years.

关键词：

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Spin-valley resolved photon-assisted tunneling in carbon nanotube double quantum dots

引用

Physical Review B 2017年第20期95卷 205305-205305页

作者： E. N. Osika B. Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

We consider photon-assisted tunneling (PAT) and the Landau–Zener–Stueckelberg (LZS) interference for double quantum dots induced electrostatically along a semiconducting carbon nanotube. An atomistic tight-binding approach and the time-dependent configuration-interaction method are employed to describe systems of a few confined electrons and holes. We reproduce the patterns of the LZS interference recently observed for quantum double dots describing transport across hole-localized states. Moreover, we indicate that for charge configurations for which the ground state is Pauli-blocked, PAT can be used for resolution of the transitions that involve spin-flip or intervalley transitions without the spin-valley conserving background signal.

关键词： Coulomb blockade Optical spin injection Quantum interference effects Semiconductors Double quantum dots

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Influence of the selected superalloy and ceramic crucible on the melting and melt-pouring process during the investment casting of the aircraft components

Influence of the selected superalloy and ceramic crucible on...

引用

73rd World Foundry Congress: Creative Foundry, WFC 2018

作者： Cygan, Rafal Rakoczy, Lukasz Nowak, Rafal Sobczak, Natalia Consolidated Precision Products ul. Hetmanska 120 Rzeszow35-078 Poland AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science av. Mickiewicza 30 Krakow30-059 Poland Foundry Research Institute ul. Zakopianska 73 Krakow30-418 Poland

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Random projection initialization for deep neural networks 25

Random projection initialization for deep neural networks

引用

25th European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning, ESANN 2017

作者： Wójcik, Piotr Iwo Kurdziel, Marcin AGH University of Science and Technology Faculty of Computer Science Electronics and Telecommunications Department of Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland

ISBN: (纸本)9782875870391

In this work we propose to initialize rectifier neural networks with random projection matrices. We focus on Convolutional Neural Networks and fully-connected networks with pretraining. Our results show, that in convolutional networks a well designed random projection initialization can perform better than the current state-of-the-art He's initialization. Specifically, in our evaluation, initialization based on the Subsampled Randomized Hadamard Transform consistently outperformed He's initialization on several evaluated image classification datasets. © ESANN 2017 - Proceedings, 25th European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning. All rights reserved.

关键词： Deep neural networks

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Processing of 0.55(Ba 0.9Ca 0.1)TiO 3-0.45Ba(Sn 0.2Ti 0.8)O 3 Lead Free Ceramics with Giant Piezoelectricity

SSRN

引用

SSRN 2019年

作者： Bijalwan, Vijay Tofel, Pavel Spotz, Zdeněk Částková, Klára Sobola, Dinara Erhart, Jiří Maca, Karel CEITEC—Central European Institute of Technology Purkyňova 127 Brno612 00 Czech Republic Brno University of Technology Dept. of Physics Faculty of Electrical Engineering and Computer Science Technická 10 Brno616 00 Czech Republic Technical University of Liberec Dept. of Physics Studentská 2 Liberec461 17 Czech Republic Brno University of Technology Dept. of Ceramics and Polymers Faculty of Mechanical Engineering Technická 2 Brno616 69 Czech Republic

We report a giant piezoelectric constant (d33), 720 pC/N and converse piezoelectric constant (d33*), 2215 pm/V for 0.55(Ba0.9Ca0.1)TiO3-0.45Ba(Sn0.2Ti0.8)O3 ceramics;the biggest value achieved for lead free piezo-ceramics so far. The fitting combination of processing and microstructural parameters e.g. initial powder particle size 1-2µm, ceramics density ~95%, and large grain size ~67µm lead to formation of rhombohedral-orthorhombic-tetragonal-cubic multiphase coexistence near room temperature. These conditions significantly increase piezoelectricity, together with high relative permittivity (Εr) >5000 and low loss tangent (tan δ) of 0.029. These results imply that the (Ba,Ca)(Sn,Ti)O3 ceramics are strong contenders to substitute lead based materials for room temperature applications. © 2019, The Authors. All rights reserved.

关键词： Piezoelectricity

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