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Latest results from GRAAL collaboration

Chinese Physics C 2009年第12期33卷 1249-1253页

作者： V. Vegna V. Bellini J.P. Bouquet L. Casano A. D'Angelo J.P. Didelez R. Di Salvo A. Fantini D. Franco G. Gervino F. Ghio G. Giardina B. Girolami A. Giusa M. Guidal e. Hourany A.S. Ignatov R. Kunnel A. Lapik A. Lleres P. Levi Sandri F. Mammoliti G. Mandaglio M. Manganaro M. Moricciani A.N. Mushkarenkov V.G. Nedorezov C. Randieri D. Rebreyend N.V. Rudnev G. Russo C. Schaerf M.L. Sperduto M.C. Sutera A.Turinge Dip. di fisica Università degli Studi di Roma 'Tor Vergata' via della Ricerca Scientifica 1 I-00133 Roma Italy INFN - Sezione di Roma 'Tor Vergata' via della Ricerca Scientifica 1 I-00133 Roma Italy Dip. di fisica e astronomia Università di Catania via Santa Sofia 44 I-95123 Catania Italy INFN - Sezione di Catania via Santa Sofia 44 I-95123 Catania Italy LPSC Universit Joseph Fourier Grenoble 1 CNRS/IN2P3 Institut National Polytechnique de Grenoble 53 Avenue des Martyres 38026 Grenoble France IPNO Universit de Paris-Sud 11 CNRS/IN2P3 15 rue Georges Clemenceau 91406 Orsay France Dip. di fisica Sperimentale Università di Torino via P.Giuria I-00125 Torino Italy INFN - Sezione di Torino via P.Giuria I-00125 Torino Italy Istituto Superiore di Sanità viale Regina Elena 299 I-00161 Roma Italy INFN - Sezione di Roma piazzale Aldo Moro 2 I-00185 Roma Italy Dip. di fisica Universitàdi Messina salita Sperone 31 I-98166 Messina Italy Institute for Nuclear Research RAS 117312 Moscow Russia INFN - Laboratori Nazionali di Frascati via E.Fermi 40 I-00044 Frascati Italy INFN - Sezione di Catania via Santa Sofia 44 I-95123 Catania Italy

The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of 1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduCtion on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the ∑ beam asymmetries in η and π0 photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K＋A photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.

关键词： polarized photon meson photoproduction polarization observables

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Charged Gravastar in a Dark energy Universe

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Journal of Modern Physics 2013年第6期4卷 869-878页

作者： C.F.C.Brandt R.Chan M.F.A.da Silva P.Rocha Departamento de fisica Teorica Instituto de FisicaUniversidade do Estado do Rio de JaneiroRua Sao Francisco Xavier 524MaracanaRio de Janeiro-RJBrasil Coordenacao de astronomia e Astrofisica Observatorio NacionalRua General Jose Cristino77Sao CristovaoRio de JaneiroRJBrazil IST-Instituto Superior de Tecnologia de Paracambi FAETECRua Sebastiao de Lacerda s/nBairro da FabricaParacambiRJBrazil

Here we constructed a charged gravastar model formed by an interior de Sitter spacetime, a charged dynamical infinitely thin shell with an equation of state and an exterior de Sitter-Reissner-Nordstrom spacetime. We find that the presence of the charge is crucial to the stability of these structures. It can as much favor the stability of a bounded excursion gravastar, and still converting it in a stable gravastar, as make disappear a stable gravastar, depending on the range of the charge considered. There is also formation of black holes and, above certain values, the presence of the charge allows the formation of naked singularity. This is an important example in which a naked singularity emerges as a consequence of unstabilities of a gravastar model, which reinforces that gravastar is not an alternative model to black hole.

关键词： Gravastar Charge De Sitter-Reissner-Nordstrom Spacetime Black Hole Naked Singularity Dark energy

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Spatio-temporal visualization of light transport in complex photonic structures

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Light(Science & Applications) 2016年第1期5卷 714-722页

作者： Lorenzo Pattelli Romolo Savo Matteo Burresi Diederik S Wiersma european Laboratory for Non-linear Spectroscopy(LeNS) Universitàdi FirenzeSesto Fiorentino(FI)50019Italy Istituto Nazionale di Ottica(CNR-INO) Firenze(FI)50125Italy Dipartimento di fisica e astronomia Universitàdi FirenzeSesto Fiorentino(FI)50019Italy Laboratoire Kastler Brossel UMR 8552CNRSEcole Normale SupérieureUniversitéPierre et Marie CurieCollège de France24 rue LhomondParis 75005France Gestione SILO Srl via di Castelpulci 14/dScandicci(FI)50010Italy

Spatio-temporal imaging of light propagation is very important in photonics because it provides the most direct tool available to study the interaction between light and its host ***-ps time resolution is needed to investigate the fine and complex structural features that characterize disordered and heterogeneous structures,which are responsible for a rich array of transport physics that have not yet been fully explored.A newly developed wide-field imaging system enables us to present a spatiotemporal study on light transport in various disordered media,revealing properties that could not be properly assessed using standard *** extending our investigation to an almost transparent membrane,a configuration that has been difficult to characterize until now,we unveil the peculiar physics exhibited by such thin scattering systems with transport features that go beyond mainstream diffusion modeling,despite the occurrence of multiple scattering.

关键词： diffusive approximation disordered media light transport optical gating wide-field imaging

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ANALYSIS OF A MeCHANICAL SOLVeR FOR LINeAR SYSTeMS OF eQUATIONS

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Journal of Computational Mathematics 2001年第1期19卷 9-14页

作者： Luis Vazquez (dept. Matematica Aplicada, Facultad de Informatica, Universidad Complutense, 28040-Madrid, Spain ) Salvador Jimenez (dept. Matematica y fisica Aplicadas, Universidad Alfonso X e1 Sabio, Avda. Universidad 1, 28691-Villanueva de la Canada, Mad Universidad Complutense 西班牙 28040- Universidad Alfonso X e1 Sabio 西班牙 128691

In this contribution we analyse some fundamental features of an iterative method to solve systems of linear equations, following the approve introduced in a previous work[l]. Such questions range from optimal parameters and initial conditions to comparison with other methods. An interesting result is that a priori we can give an estimation of the number of iterations to get a given accuracy.

关键词： Iterative method Linear systems Classical dynamics.

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Searching for Multiple Populations in Star Clusters Using the China Space Station Telescope

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Research in Astronomy and Astrophysics 2022年第9期22卷 47-62页

作者： Chengyuan Li Zhenya Zheng Xiaodong Li Xiaoying Pang Baitian Tang Antonino P.Milone Yue Wang Haifeng Wang Dengkai Jiang School of Physics and Astronomy Sun Yat-sen UniversityDaxue RoadZhuhaiGuangdong 519082China CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area Zhuhai 519082China CAS Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryShanghai 200030China Division of Optical Astronomical Technologies Shanghai Astronomical ObservatoryShanghai 200030China Department of Physics Xi'an Jiaotong-Liverpool UniversitySuzhou 215123China Shanghai Key Laboratory for Astrophysics Shanghai Normal University100 Guilin Roadshanghai 200234China Dipartimento di fisica e astronomia“Galileo Galilei” Universitàdi PadovaVicolo dell'Osservatorio 31-35122PaduaItaly Istituto Nazionale di Astrofisica—Osservatorio Astronomico di Padova Italy Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 1001010China GePI Observatoire de ParisUniversitéPSLCNRSPlace Jules Janssen F-92195MeudonFrance Yunnan Observatories Chinese Academy of Sciences396 YangfangwangGuandu DIstrictKuming 650216China Key Laboratory for the Structure and evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China

Multiple stellar populations(MPs) in most star clusters older than 2 Gyr, as seen by lots of spectroscopic and photometric studies, have led to a significant challenge to the traditional view of star formation. In this field, spacebased instruments, in particular the Hubble Space Telescope(HST), have made a breakthrough as they significantly improved the efficiency of detecting MPs in crowded stellar fields by images. The China Space Station Telescope(CSST) and the HST are sensitive to a similar wavelength interval, but the CSST covers a field of view which is about 5–8 times wider than that of HST. One of its instruments, the Multi-Channel Imager(MCI),will have multiple filters covering a wide wavelength range from NUV to NIR, making the CSST a potentially powerful tool for studying MPs in clusters. In this work, we evaluate the efficiency of the designed filters for the MCI/CSST in revealing MPs in different color–magnitude diagrams(CMDs). We find that CMDs made with MCI/CSST photometry in appropriate UV filters are powerful tools to disentangle stellar populations with different abundances of He, C, N, O and Mg. On the contrary, the traditional CMDs are blind to multiple populations in globular clusters(GCs). We show that CSST has the potential of being the spearhead instrument for investigating MPs in GCs in the next decades.

关键词： Galaxy:globular clusters general-stars abundances-techniques photometric

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复杂网络：结构和动力学

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复杂系统与复杂性科学 2006年第3期3卷 56-94页

作者： S. Boccaletti V. Latora Y. Moreno M. Chavezf D. -U. Hwang 方爱丽（译）赵继军（译） CNR-Istituto dei Sistemi Complessi Largo E. Fermi 650125 Florence Italy Dipartimento di fisica e astronomia Universita di Catania Via S. Sofia 6495123 Catania Italy Instituto Nazionale di fisica Nucleare Sezione di Catania Via S. Sofia 6495123 Catania Italy Instituto de Biocomputacion y fisica de Sistemas Complejos Universidad de Zaragoza Zaragoza 50009 Spain Departamento de fisica Teorica Universidad de Zaragoza Zaragoza 50009 Spain Laboratoire de Neurosciences Cognitives et Imagerie Cerebrale （LeNA） CNRS UPR-640 Hopital de la Salpetriere.47 Bd. de 1＇ Hopital 75651 Paris CEDEX 13 France 青岛大学复杂性科学研究所山东青岛266071

耦合的生物化学系统、神经网络、相互作用的群居物种、互联网和万维网只是由大量高度相互连接的动态个体组成的系统的少数几个例子。获取这类系统的全局特征的首选方法是建立图模型——图中的点代表动态个体，边代表个体间的相互作用。... 详细信息

耦合的生物化学系统、神经网络、相互作用的群居物种、互联网和万维网只是由大量高度相互连接的动态个体组成的系统的少数几个例子。获取这类系统的全局特征的首选方法是建立图模型——图中的点代表动态个体，边代表个体间的相互作用。一方面，科学家们需要处理结构问题如刻画一个复杂连线体系的拓扑结构、揭示建立在现实网络基础上的统一原理，以及完善模型从而模拟网络的增长和复制网络结构特性；另一方面，在研究复杂网络动力学时会产生许多相关问题，例如研究一个大的动态系统如何通过复杂连接的相互作用来表现集体行为的。我们回顾了近来在研究复杂网络的结构和动力学方面的主要概念以及取得的结果，总结了这些思想在许多不同学科包括从非线性科学到生物学、从统计力学到医药学以及工程学等领域的有关应用。

关键词：复杂网络拓扑结构动力学生物化学系统相互作用非线性科学神经网络全局特征

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复杂网络:结构和动力学

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复杂系统与复杂性科学 2007年第1期4卷 49-92页

作者： S.Boccaletti V.Latora Y.Moreno M.Chavezf D.-U.Hwang 方爱丽赵继军 CNR-Istituto dei Sistemi Complessi Largo E. Fermi Dipartimento di fisica e astronomia Universitá di Catania Via S. Sofia Instituto Nazionale di fisica Nucleare Sezione di Catania Via S. Sofia 6495123 Catania Italy Instituto de Biocomputacióny Física de Sistemas Complejos Universidad de Zaragoza Departamento de fisica Teórica Universidad de Zaragoza Zaragoza 50009 Spain Laboratoire de Neurosciences Cognitives et Imagerie Cérébrale (LeNA) CNRS UPR-640 Hpital de la Salpêtrière.47 Bd.de l'Hopital 青岛大学复杂性科学研究所

本章将讨论前述理论在实际网络中的应用,包括网络的结构和动力学两方面的问题.首先回顾社会网络的某些结构并考虑两类社会网络(意见形成和博弈模型)的动态演化,然后探讨因特网和万维网的统计属性,最后集中讨论生物和医学复杂网络,如分... 详细信息

本章将讨论前述理论在实际网络中的应用,包括网络的结构和动力学两方面的问题.首先回顾社会网络的某些结构并考虑两类社会网络(意见形成和博弈模型)的动态演化,然后探讨因特网和万维网的统计属性,最后集中讨论生物和医学复杂网络,如分子成分之间的相互作用网和神经网络.

关键词：复杂网络动力学结构社会网络动态演化博弈模型神经网络相互作用

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Comparative case study of two methods to assess the eruptive potential of selected active regions

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Research in Astronomy and Astrophysics 2021年第12期21卷 471-487页

作者： Francesca Zuccarello Ilaria ermolli Marianna B.Korsós Fabrizio Giorgi Salvo L.Guglielmino Robertus erdélyi Paolo Romano Dipartimento di fisica e astronomia"ettore Majorana" Universitàdi CataniaVia S.Sofia 78195123 CataniaItaly INAF Osservatorio Astrofisico di Catania Via S.Sofia 781-95123 CataniaItaly INAF Osservatorio Astronomico di Roma Via Frascati 331-00078 Monte Porzio CatoneItaly Department of Physics Aberystwyth UniversityCeredigionCymruSY233BZUK Department of Astronomy E?tv?s Loránd UniversityPazmany P.setany 1/ABudapestH-l 117Hungary Solar Physics&Space Plasma Research Center(SP2RC) School of Mathematics and StatisticsUniversity of SheffieldHicks BuildingHounsfield RoadS37RHUK Gyula Bay Zoltán Solar Observatory(GSO) Hungarian Solar Physics Foundation(HSPF)etofi ter 3.GyulaH-5700Hungary

Solar eruptive events,like flares and coronal mass ejections,are characterized by the rapid release of energy that can give rise to emission of radiation across the entire electromagnetic spectrum and to an abrupt significant increase in the kinetic energy of *** energetic phenomena can have important effects on the space weather conditions and therefore it is necessary to understand their origin,in particular,what is the eruptive potential of an active region(AR).In these case studies,we compare two distinct methods that were used in previous works to investigate the variations of some characteristic physical parameters during the pre-flare states of flaring *** methods consider:i)the magnetic flux evolution and magnetic helicity accumulation,and ii)the fractal and multi-fractal properties of flux concentrations in *** comparative analysis is based on time series of photospheric data obtained by the Solar Dynamics Observatory between March 2011 and June *** selected two distinct samples of ARs:one is distinguished by the occurrence of more energetic M-and X-class flare events,that may have a rapid effect on not just the near-earth space,but also on the terrestrial environment;the second is characterized by no-flares or having just a few C-and B-class *** found that the two tested methods complement each other in their ability to assess the eruptive potentials of ARs and could be employed to identify ARs prone to flaring *** on the presented case study,we suggest that using a combination of different methods may aid to identify more reliably the eruptive potentials of ARs and help to better understand the pre-flare states.

关键词： Sun:magnetic fields Sun:photosphere Sun:sunspots Sun:flares Sun:activity

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Feasibility and physics potential of detecting ^(8)B solar neutrinos at JUNO

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Chinese Physics C 2021年第2期45卷 93-110页

作者： Angel Abusleme Thomas Adam Shakeel Ahmad Sebastiano Aiello Muhammad Akram Nawab Ali Fengpeng An Guangpeng An Qi An Giuseppe Andronico Nikolay Anfimov Vito Antonelli Tatiana Antoshkina Burin Asavapibhop João Pedro Athayde Marcondes de André Didier Auguste Andrej Babic Wander Baldini Andrea Barresi eric Baussan Marco Bellato Antonio Bergnoli enrico Bernieri David Biare Thilo Birkenfeld Sylvie Blin David Blum Simon Blyth Anastasia Bolshakova Mathieu Bongrand Clément Bordereau Dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano Max Buesken Mario Buscemi Jose Busto Ilya Butorov Anatael Cabrera Hao Cai Xiao Cai Yanke Cai Zhiyan Cai Antonio Cammi Agustin Campeny Chuanya Cao Guofu Cao Jun Cao Rossella Caruso Cédric Cerna Jinfan Chang Yun Chang Pingping Chen Po-An Chen Shaomin Chen Shenjian Chen Xurong Chen Yi-Wen Chen Yixue Chen Yu Chen Zhang Chen Jie Cheng Yaping Cheng Alexander Chepurnov Davide Chiesa Pietro Chimenti Artem Chukanov Anna Chuvashova Gérard Claverie Catia Clementi Barbara Clerbaux Selma Conforti Di Lorenzo Daniele Corti Salvatore Costa Flavio Dal Corso Christophe De La Taille Jiawei Deng Zhi Deng Ziyan Deng Wilfried Depnering Marco Diaz Xuefeng Ding Yayun Ding Bayu Dirgantara Sergey Dmitrievsky Tadeas Dohnal Georgy Donchenko Jianmeng Dong Damien Dornic evgeny Doroshkevich Marcos Dracos Frédéric Druillole Shuxian Du Stefano Dusini Martin Dvorak Timo enqvist Heike enzmann Andrea Fabbri Lukas Fajt Donghua Fan Lei Fan Can Fang Jian Fang Marco Fargetta Anna Fatkina Dmitry Fedoseev Vladko Fekete Li-Cheng Feng Qichun Feng Richard Ford Andrey Formozov Amélie Fournier Haonan Gan Feng Gao Alberto Garfagnini Alexandre Göttel Christoph Genster Marco Giammarchi Agnese Giaz Nunzio Giudice Franco Giuliani Maxim Gonchar Guanghua Gong Hui Gong Oleg Gorchakov Yuri Gornushkin Marco Grassi Christian Grewing Maxim Gromov Vasily Gromov Minghao Gu Xiaofei Gu Yu Gu Mengyun Guan Nunzio Guardone Maria Gul Cong Guo Jingyuan Guo Wanlei Guo Xinheng Guo Yuhang Guo Paul Hackspacher Caren Hagner Ran Han Yan Yerevan Physics Institute YerevanArmenia UniversitéLibre de Bruxelles BrusselsBelgium Universidade estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro RioBrazil Pontificia Universidad Católica de Chile SantiagoChile Universidad Tecnica Federico Santa Maria ValparaisoChile Beijing Institute of Spacecraft environment engineering BeijingChina Beijing Normal University BeijingChina China Institute of Atomic energy BeijingChina Institute of High energy Physics BeijingChina North China electric Power University BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua University BeijingChina University of Chinese Academy of Sciences BeijingChina Jilin University ChangchunChina College of electronic Science and engineering National University of Defense TechnologyChangshaChina Chongqing University ChongqingChina Dongguan University of Technology DongguanChina Jinan University GuangzhouChina Sun Yat-Sen University GuangzhouChina Harbin Institute of Technology HarbinChina University of Science and Technology of China HefeiChina The Radiochemistry and Nuclear Chemistry Group in University of South China HengyangChina Wuyi University JiangmenChina Shandong University JinanChina Institute of Modern Physics Chinese Academy of SciencesLanzhouChina Nanjing University NanjingChina Guangxi University NanningChina east China University of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina Institute of Hydrogeology and environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai University TianjinChina Wuhan University WuhanChina Xi’an Jiaotong University Xi’anChina Xiamen University XiamenChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhouChina Institute of Physics National Chiao-Tung University Hsinchu National United University Miao-Li Department of Physics National T

The Jiangmen Underground Neutrino Observatory(JUNO)features a 20 kt multi-purpose underground liquid scintillator sphere as its main *** of JUNO's features make it an excellent location for^8B solar neutrino measurements,such as its low-energy threshold,high energy resolution compared with water Cherenkov detectors,and much larger target mass compared with previous liquid scintillator *** this paper,we present a comprehensive assessment of JUNO's potential for detecting^8B solar neutrinos via the neutrino-electron elastic scattering process.A reduced 2 MeV threshold for the recoil electron energy is found to be achievable,assuming that the intrinsic radioactive background^(238)U and^(232)Th in the liquid scintillator can be controlled to 10^(-17)g/*** ten years of data acquisition,approximately 60,000 signal and 30,000 background events are *** large sample will enable an examination of the distortion of the recoil electron spectrum that is dominated by the neutrino flavor transformation in the dense solar matter,which will shed new light on the inconsistency between the measured electron spectra and the predictions of the standard three-flavor neutrino oscillation *** m^(2)_(21)=4.8times10^(-5);(7.5times10^(-5))eV^(2),JUNO can provide evidence of neutrino oscillation in the earth at approximately the 3sigma(2sigma)level by measuring the non-zero signal rate variation with respect to the solar zenith ***,JUNO can simultaneously measureDelta m^2_(21)using^8B solar neutrinos to a precision of 20% or better,depending on the central value,and to sub-percent precision using reactor antineutrinos.A comparison of these two measurements from the same detector will help understand the current mild inconsistency between the value of Delta m^2_(21)reported by solar neutrino experiments and the KamLAND experiment.

关键词： neutrino oscillation solar neutrino JUNO

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复杂网络:结构与动力学

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复杂系统与复杂性科学 2006年第4期3卷 52-90页

作者： S.Boccaletti V.Latora Y.Moreno M.Chavezf D.-U.Hwang 熊文海赵继军 CNR-Istituto dei Sistemi Complessi Largo E. Fermi 650125 Florence Italy Dipartimento di fisica e astronomia Universit(a) di Catania Via S. Sofia 6495123 Catania Italy Instituto Nazionale di fisica Nucleare Sezione di Catania Via S. Sofia 6495123 Catania Italy Instituto de Biocomputación y Física de Sistemas Complejos Universidad de Zaragoza Zaragoza 50009 Spain Departamento de fisica Teórica Universidad de Zaragoza Zaragoza 50009 Spain Laboratoire de Neurosciences Cognitives et Imagerie Cérébrale (LeNA) CNRS UPR-640 H(o)pital de la Salpêtrière.47 Bd.de l''H(o)pital 75651 Paris CEDEX 13 France 青岛大学复杂性科学研究所 266071

　　(续本刊2006年第3期)　　3 静态与动态鲁棒性　　网络的鲁棒性是指当网络中的部分节点或边被破坏时,网络仍然能够继续维持其功能的能力.这是一个具有明显实际意义的论题,因为它直接影响着任何发生在网络上的过程的效率,而且它也是... 详细信息

　　(续本刊2006年第3期)　　3 静态与动态鲁棒性　　网络的鲁棒性是指当网络中的部分节点或边被破坏时,网络仍然能够继续维持其功能的能力.这是一个具有明显实际意义的论题,因为它直接影响着任何发生在网络上的过程的效率,而且它也是复杂网络文献中最早被探索的论题之一.……

关键词：复杂网络结构鲁棒性网络文献分节点效率能力功能

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