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ψ(2S) Suppression in Pb-Pb Collisions at the LHC

Physical Review Letters 2024年第4期132卷 042301-042301页

作者： S. Acharya D. Adamová A. Adler G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn I. Ahuja A. Akindinov M. Al-Turany D. Aleksandrov B. Alessandro H. M. Alfanda R. Alfaro Molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev M. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata S. Arcelli M. Aresti R. Arnaldi I. C. Arsene M. Arslandok A. Augustinus R. Averbeck M. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio M. Barlou G. G. Barnaföldi L. S. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch F. Baruffaldi N. Bastid S. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied S. Belokurova V. Belyaev G. Bencedi S. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann M. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin M. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro S. Biswas N. Bize J. T. Blair D. Blau M. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov S. Boi J. Bok L. Boldizsár A. Bolozdynya M. Bombara P. M. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. M. Bouziani L. Bratrud P. Braun-Munzinger M. Bregant M. Broz G. E. Bruno D. Budnikov H. Buesching S. Bufalino O. Bugnon P. Buhler Z. Buthelezi S. A. Bysiak M. Cai H. Caines A. Caliva E. Calvo Villar J. M. M. Camacho P. Camerini F. D. M. Canedo M. Carabas A. A. Carballo F. Carnesecchi R. Caron J. Castillo Castellanos F. Catalano C. Ceballos Sanchez I. Chakaberia P. Chakraborty S. Chandra S. Chapeland M. Chartier S. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. S. Chizzali J. Cho S. Cho P. Chochula P. Christakoglou C. H. Christensen P. Christianse Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Munster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Department of Physics University of Oslo

The production of the ψ(2S) charmonium state was measured with ALICE in Pb-Pb collisions at sNN=5.02 TeV, in the dimuon decay channel. A significant signal was observed for the first time at LHC energies down to zer... 详细信息

关键词： Color confinement Relativistic heavy-ion collisions Quarkonia

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Atacama Cosmology Telescope: Constraints on cosmic birefringence

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Physical Review D 2020年第8期101卷 083527-083527页

作者： Toshiya Namikawa Yilun Guan Omar Darwish Blake D. Sherwin Simone Aiola Nicholas Battaglia James A. Beall Daniel T. Becker J. Richard Bond Erminia Calabrese Grace E. Chesmore Steve K. Choi Mark J. Devlin Joanna Dunkley Rolando Dünner Anna E. Fox Patricio A. Gallardo Vera Gluscevic Dongwon Han Matthew Hasselfield Gene C. Hilton Adam D. Hincks Renée Hložek Johannes Hubmayr Kevin Huffenberger John P. Hughes Brian J. Koopman Arthur Kosowsky Thibaut Louis Marius Lungu Amanda MacInnis Mathew S. Madhavacheril Maya Mallaby-Kay Loïc Maurin Jeffrey McMahon Kavilan Moodley Sigurd Naess Federico Nati Laura B. Newburgh John P. Nibarger Michael D. Niemack Lyman A. Page Frank J. Qu Naomi Robertson Alessandro Schillaci Neelima Sehgal Cristóbal Sifón Sara M. Simon David N. Spergel Suzanne T. Staggs Emilie R. Storer Alexander van Engelen Jeff van Lanen Edward J. Wollack Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Road Cambridge CB3 0WA United Kingdom Department of Physics and Astronomy University of Pittsburgh Pittsburgh Pennsylvania 15260 USA Center for Computational Astrophysics Flatiron Institute 162 5th Avenue New York New York 10010 USA Department of Astronomy Cornell University Ithaca New York 14853 USA National Institute of Standards and Technology 325 Broadway Boulder Colorado 80305 USA Canadian Institute for Theoretical Astrophysics University of Toronto 60 St. George Street Toronto Ontario M5S 3H8 Canada School of Physics and Astronomy Cardiff University Cardiff CF10 3AT United Kingdom Department of Physics University of Michigan Ann Arbor Michigan 48109 USA Department of Physics and Astronomy University of Pennsylvania 209 South 33rd Street Philadelphia Pennsylvania 19104 USA Department of Astrophysical Sciences Princeton University 4 Ivy Lane Princeton New Jersey 08544 USA Joseph Henry Laboratories of Physics Jadwin Hall Princeton University Princeton New Jersey 08544 USA Instituto de Astrofísica and Centro de Astro-Ingeniería Facultad de Física Pontificia Universidad Católica de Chile Avenida Vicuña Mackenna 4860 7820436 Macul Santiago Chile Department of Physics Cornell University Ithaca New York 14853 USA Department of Physics and Astronomy University of Southern California Los Angeles California 90089-0484 USA Physics and Astronomy Department Stony Brook University Stony Brook New York 11794 USA Dunlap Institute for Astronomy and Astrophysics University of Toronto 50 St. George Street Toronto Ontario M5S 3H4 Canada David A. Dunlap Department of Astronomy and Astrophysics University of Toronto 50 St. George Street Toronto Ontario M5S 3H4 Canada Quantum Sensors Group NIST Boulder 325 Broadway Boulder Colorado 80305 USA Department of Physics Florida State University 609 Keen Physics Building Tallahassee Florida 32306 USA Departmen

We present new constraints on anisotropic birefringence of the cosmic microwave background polarization using two seasons of data from the Atacama Cosmology Telescope covering 456 square degrees of sky. The birefringence power spectrum, measured using a curved-sky quadratic estimator, is consistent with zero. Our results provide the tightest current constraint on birefringence over a range of angular scales between 5 arc minutes and 9°. We improve previous upper limits on the amplitude of a scale-invariant birefringence power spectrum by a factor of between 2 and 3. Assuming a nearly massless axion field during inflation, our result is equivalent to a 2σ upper limit on the Chern-Simons coupling constant between axions and photons of gαγ<4.0×10−2/HI, where HI is the inflationary Hubble scale.

关键词： Cosmic microwave background Cosmology Axions

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Euclid Quick Data Release (Q1). The Strong Lensing Discovery Engine C - Finding lenses with machine learning

arXiv

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arXiv 2025年

作者： Lines, N.E.P. Collett, T.E. Walmsley, M. Rojas, K. Li, T. Leuzzi, L. Manjón-García, A. Vincken, S.H. Wilde, J. Holloway, P. Verma, A. Metcalf, R.B. Andika, I.T. Melo, A. Melchior, M. Domínguez Sánchez, H. Díaz-Sánchez, A. Acevedo Barroso, J.A. Clément, B. Krawczyk, C. Pearce-Casey, R. Serjeant, S. Courbin, F. Despali, G. Gavazzi, R. Schuldt, S. Degaudenzi, H. Ecker, L.R. Enzi, W.J.R. Finner, K. Galan, A. Giocoli, C. Hogg, N.B. Jahnke, K. Kruk, S. Mahler, G. More, A. Nagam, B.C. Pearson, J. Sainz de Murieta, A. Scarlata, C. Sluse, D. Sonnenfeld, A. Spiniello, C. Thai, T.T. Tortora, C. Ulivi, L. Weisenbach, L. Zumalacarregui, M. Aghanim, N. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Aussel, H. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Bender, R. Bernardeau, F. Biviano, A. Bonchi, A. Bonino, D. Branchini, E. Brescia, M. Brinchmann, J. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V.F. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K.C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C.J. Conversi, L. Copin, Y. Costille, A. Courtois, H.M. Cropper, M. Da Silva, A. De Lucia, G. Di Giorgio, A.M. Dolding, C. Dole, H. Dubath, F. Duncan, C.A.J. Dupac, X. Escoffier, S. Fabricius, M. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. Fotopoulou, S. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillard, W. Gillis, B. Gómez-Alvarez, P. Gracia-Carpio, J. Granett, B.R. Grazian, A. Grupp, F. Guzzo, L. Gwyn, S. Haugan, S.V.H. Holmes, W. Hook, I.M. Hormuth, F. Hornstrup, A. Hudelot, P. Jhabvala, M. Keihänen, E. Kermiche, S. Kiessling, A. Kubik, B. Kümmel, M. Kunz, M. Kurki-Suonio, H. Le Boulc’h, Q. Le Brun, A.M.C. Le Mignant, D. Ligori, S. Lilje, P.B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. Institute of Cosmology and Gravitation University of Portsmouth PortsmouthPO1 3FX United Kingdom David A. Dunlap Department of Astronomy & Astrophysics University of Toronto 50 St George Street TorontoONM5S 3H4 Canada Jodrell Bank Centre for Astrophysics Department of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PL United Kingdom University of Applied Sciences and Arts of Northwestern Switzerland School of Engineering Windisch5210 Switzerland Dipartimento di Fisica e Astronomia "Augusto Righi" Alma Mater Studiorum Università di Bologna via Piero Gobetti 93/2 Bologna40129 Italy INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna Via Piero Gobetti 93/3 Bologna40129 Italy Departamento Física Aplicada Universidad Politécnica de Cartagena Campus Muralla del Mar Murcia Cartagena30202 Spain Martí i Franquès 1 Barcelona08028 Spain Department of Physics Oxford University Keble Road OxfordOX1 3RH United Kingdom Technical University of Munich TUM School of Natural Sciences Physics Department James-Franck-Str. 1 Garching85748 Germany Max-Planck-Institut für Astrophysik Karl-Schwarzschild-Str. 1 Garching85748 Germany Instituto de Física de Cantabria Edificio Juan Jordá Avenida de los Castros Santander39005 Spain Observatoire de Sauverny Versoix1290 Switzerland Lausanne1015 Switzerland School of Physical Sciences The Open University Milton KeynesMK7 6AA United Kingdom Passeig de Lluís Companys 23 Barcelona08010 Spain INFN-Sezione di Bologna Viale Berti Pichat 6/2 Bologna40127 Italy Aix-Marseille Université CNRS CNES LAM Marseille France Institut d’Astrophysique de Paris UMR 7095 CNRS Sorbonne Université 98 bis boulevard Arago Paris75014 France Dipartimento di Fisica "Aldo Pontremoli" Università degli Studi di Milano Via Celoria 16 Milano20133 Italy INAF-IASF Milano Via Alfonso Corti 12 Milano20133 Italy Department of Astronomy University of Geneva ch. d’Ecogia 16 Versoix1290 Sw

Strong gravitational lensing has the potential to provide a powerful probe of astrophysics and cosmology, but fewer than 1000 strong lenses have been confirmed previously. With 0′′ . 16 resolution covering a third of the sky, the Euclid telescope will revolutionise strong lens finding, with 170 000 lenses forecasted to be discovered amongst its 1.5 billion galaxies. We present an analysis of the performance of five machine-learning models at finding strong gravitational lenses in the quick release of Euclid data (Q1), covering 63 deg2. The models are validated with citizen scientists and expert visual inspection. We focus on the best performing network: a fine-tuned version of the Zoobot pretrained model, originally trained to classify galaxy morphologies in heterogeneous astronomical imaging surveys. Of the one million Q1 objects that Zoobot was tasked to find strong lenses within, the top 1000 ranked objects contained 122 grade A lenses (almost certain lenses), and 41 grade B lenses (probable lenses). A deeper search with the five networks combined with visual inspection discovered 250 (247) grade A (B) lenses, of which 224 (182) are ranked in the top 20 000 by Zoobot. When extrapolated to the full Euclid survey, the highest ranked one million images will contain 75 000 grade A or B strong gravitational lenses. © 2025, CC BY.

关键词： Cosmology

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Long-range Coulomb effect in above-threshold ionization of Ne subject to few-cycle and multicycle laser fields

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Physical Review A 2017年第6期95卷 063405-063405页

作者： SongPo Xu Wei Quan YongJu Chen ZhiLei Xiao YanLan Wang HuiPeng Kang LinQiang Hua Cheng Gong XuanYang Lai XiaoJun Liu XiaoLei Hao ShiLin Hu Jing Chen State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Institute of Theoretical Physics and Shanxi University Taiyuan 030006 China HEDPS Center for Applied Physics and Technology Peking University Beijing 100084 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China

The long-range Coulomb effect (LRCE) is demonstrated experimentally and theoretically by investigating the pulse duration dependence of low-energy structure (LES) in above-threshold ionization of Ne. It is found experimentally that at 800 nm the LES shows itself as a double-hump structure (DHS) in momentum distribution of singly charged ion for Ne, and moreover, this structure is more prominent for multicycle laser fields than for few-cycle cases. This result can be reproduced and explained qualitatively with a semiclassical model and attributed to the paramount role of LRCE. That is to say, after the laser field vanishes, the electrons decelerate while flying away from the core by the long-range tail of Coulomb potential, which eventually makes DHS less notable.

关键词： Long-range interactions Atoms Femtosecond laser spectroscopy

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Dynamic simulation with on the fly doppler broadening treatment in RMC

Dynamic simulation with on the fly doppler broadening treatm...

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2016 Transactions of the American Nuclear Society, ANS 2016

作者： Yuan, Yuan Liu, Shichang Qi, Xu Wang, Kan Department of Engineering Physics Tsinghua University Beijing100084 China Beijing Applied Physics and Computational Mathematics Beijing10084 China

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Analysis of micro-fluidic tweezers in the Stokes regime

arXiv

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arXiv 2017年

作者： Zhao, Longhua Zhang, Li Ding, Yang Department of Mechanical and Automation Engineering Chinese University of Hong Kong Shatin NT Hong Kong Hong Kong Division of Mechanics Beijing Computational Science Research Center Beijing100193 China Department of Mathematics Applied Mathematics and Statistics Case Western Reserve University ClevelandOH44106 United States

Nanowire fluidic tweezers have been developed to gently and accurately capture, manipulate and deliver micro objects. The mechanism behind the capture and release process has not yet been well explained. Utilizing the method of regularized Stokeslet, we study a cylindrical nanowire tumbling and interacting with spherical particles in the Stokes regime. The capture phenomenon observed in experiments is reproduced and illustrated with the trajectories of micro-spheres and fluid tracers. The flow structure and the region of capture are quantitatively examined and compared for different sizes of particles, various tumbling rates, and dimensions of the tweezers. We find that pure kinematic effects can explain the mechanism of capture and transport of particles. We further reveal the relation between the capture region and stagnation points in the displacement field, i.e., the displacement for tracer particles in the moving frame within one rotation of the wire. Copyright © 2017, The Authors. All rights reserved.

关键词： Nanowires

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The DESI Survey Validation: Results from Visual Inspection of Bright Galaxies, Luminous Red Galaxies, and Emission Line Galaxies

arXiv

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arXiv 2022年

作者： Lan, Ting-Wen Tojeiro, R. Armengaud, E. Prochaska, J. Xavier Davis, T.M. Alexander, David M. Raichoor, A. Zhou, Rongpu Yèche, Christophe Balland, C. BenZvi, S. Berti, A. Canning, R. Carr, A. Chittenden, H. Cole, S. Cousinou, M.-C. Dawson, K. Dey, Biprateep Douglass, K. Edge, A. Escoffier, S. Glanville, A. Gontcho, S.A. Gontcho Guy, J. Hahn, C. Howlett, C. Hwang, Ho Seong Jiang, L. Kovács, A. Mezcua, M. Moore, S. Nadathur, S. Oh, M. Parkinson, D. Rocher, A. Ross, A.J. Ruhlmann-Kleider, V. Sabiu, C.G. Said, K. Saulder, C. Sierra-Porta, D. Weiner, B. Yu, J. Zarrouk, P. Zhang, Y. Zou, H. Ahlen, S. Bailey, S. Brooks, D. Cooper, A.P. de la Macorra, A. Dey, A. Dhungana, G. Doel, P. Eftekharzadeh, S. Fanning, K. Font-Ribera, A. Garrison, L. Gaztañaga, E. Kehoe, R. Kisner, T. Kremin, A. Landriau, M. Le Guillou, L. Levi, Michael E. Magneville, C. Meisner, Aaron M. Miquel, R. Moustakas, J. Myers, Adam D. Newman, Jeffrey A. Nie, J.D. Palanque-Delabrouille, N. Percival, W.J. Poppett, C. Prada, F. Schubnell, M. Tarlé, Gregory Weaver, B.A. Zhang, K. Zhou, Zhimin Graduate Institute of Astrophysics Department of Physics National Taiwan University No. 1 Sec. 4 Roosevelt Rd. Taipei10617 Taiwan Department of Astronomy and Astrophysics University of California Santa Cruz 1156 High Street Santa CruzCA95065 United States SUPA School of Physics and Astronomy University of St Andrews St AndrewsKY16 9SS United Kingdom IRFU CEA Université Paris-Saclay Gif-sur-YvetteF-91191 France The University of Tokyo Chiba Kashiwa Kashiwa277-8583 Japan School of Mathematics and Physics University of Queensland 4072 Australia Centre for Extragalactic Astronomy Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States ParisFR-75005 France Department of Physics & Astronomy University of Rochester 206 Bausch and Lomb Hall P.O. Box 270171 RochesterNY14627-0171 United States Department of Physics and Astronomy The University of Utah 115 South 1400 East Salt Lake CityUT84112 United States Institute of Cosmology & Gravitation University of Portsmouth Dennis Sciama Building PortsmouthPO1 3FX United Kingdom Institute for Computational Cosmology Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Aix Marseille Univ CNRS IN2P3 CPPM Marseille France University of Pittsburgh 3941 O’Hara Street PittsburghPA15260 United States Department of Astrophysical Sciences Princeton University Peyton Hall PrincetonNJ08544 United States Lawrence Berkeley National Laboratory One Cyclotron Road BerkeleyCA94720 United States Astronomy Program Department of Physics and Astronomy Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of SNU Astronomy Research Center Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of 776 Daedeokdae-ro Yuseong-gu Daejeon34055 Korea Republic of Kavli Institute for Astronomy and Astrophysics Peking Unive

The Dark Energy Spectroscopic Instrument (DESI) Survey has obtained a set of spectroscopic measurements of galaxies to validate the final survey design and target selections. To assist in these tasks, we visually inspect (VI) DESI spectra of approximately 2,500 bright galaxies, 3,500 luminous red galaxies (LRGs), and 10,000 emission line galaxies (ELGs), to obtain robust redshift identifications. We then utilize the VI redshift information to characterize the performance of the DESI operation. Based on the VI catalogs, our results show that the final survey design yields samples of bright galaxies, LRGs, and ELGs with purity greater than 99%. Moreover, we demonstrate that the precision of the redshift measurements is approximately 10 km/s for bright galaxies and ELGs and approximately 40 km/s for LRGs. The average redshift accuracy is within 10 km/s for the three types of galaxies. The VI process also helps improve the quality of the DESI data by identifying spurious spectral features introduced by the pipeline. Finally, we show examples of unexpected real astronomical objects, such as Lyα emitters and strong lensing candidates, identified by VI. These results demonstrate the importance and utility of visually inspecting data from incoming and upcoming surveys, especially during their early operation phases. © 2022, CC BY.

关键词： Galaxies

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Simulation of Semi-Autogenous Grinding (SAG) Mill using Circular-Disks-based Model

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Journal of Physics: Conference Series 2018年第1期1090卷 012009-012009页

作者： Sari, R Widartiningsih, P M Martoprawiro, M A Hendrajaya, L Viridi, S Master Program in Computational Science Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Master Program in Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Chemistry Department Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Physics Department Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia

System of semi-autogenous grinding (SAG) mill is modeled in this work based on circular-disk objects, which represents not only the ground materials but also the mill liners. Interaction between these objects is through linear spring dash-pot force, which is solved numerically in soft-sphere scheme using molecular dynamics (MD) method. There is also force due to earth gravity. For ground materials a grain consists of several smaller grains, which are attached through some adhesive force. As the ground materials are smashed to the mill liners, when they reach maximum compression, they will be shattered into the smaller grains. Shattering process happens in a special materials motion known as cataracting mode. Friction is not considered in this work due to its complexity.

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A space-time finite element method for neural field equations with transmission delays

arXiv

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arXiv 2017年

作者： Polner, Mónika van der Vegt, J.J.W. van Gils, S.A. Bolyai Institute University of Szeged Szeged Aradi vértanúk tere 1H-6720 Hungary ELI-ALPS ELI-HU Ltd Dugonics tér 13 Szeged6720 Hungary Mathematics of Computational Science Group Department of Applied Mathematics University of Twente P.O. Box 217 Enschede7500 AE Netherlands Applied Analysis Department of Applied Mathematics University of Twente P.O. Box 217 Enschede7500 AE Netherlands

We present and analyze a new space-time finite element method for the solution of neural field equations with transmission delays. The numerical treatment of these systems is rare in the literature and currently has several restrictions on the spatial domain and the functions involved, such as connectivity and delay functions. The use of a space-time discretization, with basis functions that are discontinuous in time and continuous in space (dGcG-FEM), is a natural way to deal with space-dependent delays, which is important for many neural field applications. In this article we provide a detailed description of a space-time dGcG-FEM algorithm for neural delay equations, including an a-priori error analysis. We demonstrate the application of the dGcG-FEM algorithm on several neural field models, including problems with an inhomogeneous kernel.65M60, 65M15, 65R20, 37M05, 92C20 Copyright © 2017, The Authors. All rights reserved.

关键词： Finite element method

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resonance production in Pb–Pb collisions at TeV

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The European Physical Journal C 2023年第5期83卷 1-16页

作者： Acharya, S. Adamová, D. Adler, A. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S. U. Ahuja, I. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H. M. Alfaro Molina, R. Ali, B. Ali, Y. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altsybeev, I. Anaam, M. N. Andrei, C. Andronic, A. Anguelov, V. Antinori, F. Antonioli, P. Anuj, C. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Arnaldi, R. Arsene, I. C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M. D. Badalà, A. Baek, Y. W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Banerjee, D. Banoo, Z. Barbera, R. Barioglio, L. Barlou, M. Barnaföldi, G. G. Barnby, L. S. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Alba, J. L. Bazo Bearden, I. G. Beattie, C. Becht, P. Behera, D. Belikov, I. Bell Hechavarria, A. D. C. Bellini, F. Bellwied, R. Belokurova, S. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M. G. Betev, L. Bhaduri, P. P. Bhasin, A. Bhat, M. A. Bhattacharjee, B. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bigot, A. P. Bilandzic, A. Biro, G. Biswas, S. Bize, N. Blair, J. T. Blau, D. Blidaru, M. B. Bluhme, N. Blume, C. Boca, G. Bock, F. Bodova, T. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bolozdynya, A. Bombara, M. Bond, P. M. Bonomi, G. Borel, H. Borissov, A. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G. E. Buckland, M. D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buthelezi, Z. Butt, J. B. Bylinkin, A. Bysiak, S. A. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J. M. M. Camerini, P. Canedo, F. D. M. Carabas, M. Carnesecchi, F. Caron, R. Castillo Castellanos, J. Catalano, F. Ceballos Sanchez, C. Chakaberia, I. Chakraborty, P. Chandra, S. Chapeland, S. Chartier, M. Chattopadhyay, S. Chavez, T. G. Cheng, T. Ch Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an Institute Covered by a Cooperation Agreement with CERN Geneva Switzerland Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico COMSATS University Islamabad Islamabad Pakistan Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy University of Houston Houston USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padua Italy Lawrence Berkeley National Laboratory Berkeley USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble

Hadronic resonances are used to probe the hadron gas produced in the late stage of heavy-ion collisions since they decay on the same timescale, of the order of 1–10 fm/c, as the decoupling time of the system. In the hadron gas, (pseudo)elastic scatterings among the products of resonances that decayed before the kinetic freeze-out and regeneration processes counteract each other, the net effect depending on the resonance lifetime, the duration of the hadronic phase, and the hadronic cross sections at play. In this context, the $$\Sigma (1385)^{\pm }$$ particle is of particular interest as models predict that regeneration dominates over rescattering despite its relatively short lifetime of about 5.5 fm/c. The first measurement of the $$\Sigma (1385)^{\pm }$$ resonance production at midrapidity in Pb–Pb collisions at $$\sqrt{s_{\textrm{NN}}}= 5.02$$ TeV with the ALICE detector is presented in this Letter. The resonances are reconstructed via their hadronic decay channel, $$\Lambda \pi $$ , as a function of the transverse momentum ( $$p_\textrm{T}$$ ) and the collision centrality. The results are discussed in comparison with the measured yield of pions and with expectations from the statistical hadronization model as well as commonly employed event generators, including PYTHIA8/Angantyr and EPOS3 coupled to the UrQMD hadronic cascade afterburner. None of the models can describe the data. For $$\Sigma (1385)^{\pm }$$ , a similar behaviour as $$\textrm{K}^{*} (892)^{0}$$ is observed in data unlike the predictions of EPOS3 with afterburner.

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