检索结果-内蒙古大学图书馆

Publisher Correction: A robotic multidimensional directed evolution approach applied to fluorescent voltage reporters

引用

Nature chemical biology 2018年第9期14卷 901-901页

作者： Kiryl D Piatkevich Erica E Jung Christoph Straub Changyang Linghu Demian Park HoJun Suk Daniel R Hochbaum Daniel Goodwin Eftychios Pnevmatikakis Nikita Pak Takashi Kawashima ChaoTsung Yang Jeffrey L Rhoades Or Shemesh Shoh Asano YoungGyu Yoon Limor Freifeld Jessica L Saulnier Clemens Riegler Florian Engert Thom Hughes Mikhail Drobizhev Balint Szabo Misha B Ahrens Steven W Flavell Bernardo L Sabatini Edward S Boyden Media Lab Massachusetts Institute of Technology (MIT) Cambridge MA USA. Howard Hughes Medical Institute Department of Neurobiology Harvard Medical School Boston MA USA. Department of Electrical Engineering and Computer Science MIT Cambridge MA USA. Harvard-MIT Division of Health Sciences and Technology MIT Cambridge MA USA. Simons Center Data Analysis Simons Foundation New York NY USA. Department of Mechanical Engineering MIT Cambridge MA USA. Janelia Research Campus Howard Hughes Medical Institute Ashburn Virginia USA. Picower Institute for Learning & Memory and Department of Brain & Cognitive Sciences MIT Cambridge MA USA. Department of Molecular and Cellular Biology and Center for Brain Science Harvard University Cambridge MA USA. Department of Neurobiology Faculty of Life Sciences University of Vienna Wien Austria. Department of Cell Biology and Neuroscience Montana State University Bozeman Montana USA. Department of Biological Physics Eotvos University Budapest Hungary. Media Lab Massachusetts Institute of Technology (MIT) Cambridge MA USA. esb@media.mit.edu. Department of Biological Engineering MIT Cambridge MA USA. esb@media.mit.edu. MIT Center for Neurobiological Engineering MIT Cambridge MA USA. esb@media.mit.edu. Department of Brain and Cognitive Sciences MIT Cambridge MA USA. esb@media.mit.edu. MIT McGovern Institute for Brain Research MIT Cambridge MA USA. esb@media.mit.edu.

In the version of this article originally published, the bottom of Figure 4f,g was partially truncated in the PDF. The error has been corrected in the PDF version of this article.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Measurement of the relative B−→D0/D*0/D**0μ−ν¯μ branching fractions using B− mesons from B¯s2*0 decays

引用

Physical Review D 2019年第9期99卷 092009-092009页

作者： R. Aaij B. Adeva M. Adinolfi C. A. aidala Z. Ajaltouni S. Akar P. Albicocco J. Albrecht F. Alessio M. Alexander A. Alfonso Albero S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann J. J. Back S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow S. Barsuk W. Barter F. Baryshnikov V. Batozskaya B. Batsukh V. Battista A. Bay J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel S. Belin N. Beliy V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff E. Bertholet A. Bertolin C. Betancourt F. Betti M. O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bhasin J. Bhom S. Bifani P. Billoir A. Birnkraut A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska V. Bocci O. Boente Garcia T. Boettcher A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock C. Bozzi S. Braun M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu E. Buchanan A. Buonaura C. Burr A. Bursche J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese R. Calladine M. Calvi M. Calvo Gomez A. Camboni P. Campana D. H. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina M. Cattaneo G. Cavallero R. Cenci D. Chamont M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville V. Chekalina C. Chen S. Chen S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin P. Ciambrone X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. A. B. Coelho J. Cogan E. Cogneras L. Cojocariu P. Collins T. Colombo A. Comerma-Montells A. Contu G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres R. Currie C. D’Ambrosio F. Da Cunha Marinho C. L. Da Silv Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom University of Michigan Ann Arbor USA (associated with Institution Syracuse University Syracuse New York USA) Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA INFN Laboratori Nazionali di Frascati Frascati Italy Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil INFN Sezione di Padova Padova Italy LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Center for High Energy Physics Tsinghua University Beijing China INFN Sezione di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland INFN Sezione di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Yandex School of Data Analysis Moscow Russia Physik-Institut Universität Zürich Zürich Switzerland INFN Sezione di Cagliari Monserrato Italy Department of Physics University of Warwick Coventry United Kingdom National University of Science and Technology “MISIS” Moscow Rus

The decay of the narrow resonance B¯s2*0→B−K+ can be used to determine the B− momentum in partially reconstructed decays without any assumptions on the decay products of the B− meson. This technique is employed for the first time to distinguish contributions from D0, D*0, and higher-mass charmed states (D**0) in semileptonic B− decays by using the missing-mass distribution. The measurement is performed using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected with the LHCb detector in pp collisions at center-of-mass energies of 7 and 8 TeV. The resulting branching fractions relative to the inclusive B−→D0Xμ−ν¯μ are fD0=B(B−→D0μ−ν¯μ)/B(B−→D0Xμ−ν¯μ)=0.25±0.06,fD**0=B(B−→(D**0→D0X)μ−ν¯μ)/B(B−→D0Xμ−ν¯μ)=0.21±0.07, with fD*0=1−fD0−fD**0 making up the remainder.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Bottom mesons

来源：评论

学校读者我要写书评

暂无评论

Guest Editorial Measuring and Troubleshooting the Internet: Algorithms, Tools and applications

引用

IEEE Journal on Selected Areas in Communications 2016年第6期34卷 1805-1806页

作者： Maurizio Dusi Alessandro Finamore Kimberly Claffy Nevil Brownlee Darryl Veitch Copan Diagnostics Inc. Murrieta CA USA Telefonica Research Distrito Telefonica Madrid Spain Center for Applied Internet Data Analysis San Diego Supercomputer Center La Jolla CA USA Department of Computer Science The University of Auckland Auckland New Zealand School of Computing and Communications Faculty of Engineering and Information Technology University of Technology Sydney Ultimo NSW Australia

The ubiquity of Internet access and the wide variety of Internet-enabled devices and applications have made the Internet a principal pillar of the Information Society. Decentralized and diverse, the Internet is resilient and universal. However, its distributed nature leads to operational brittleness and difficulty in identifying and tracking the root causes of performance and availability issues.

关键词： Special issues and sections Internet Algorithm design and analysis Performance analysis Quality of service

来源：评论

学校读者我要写书评

暂无评论

Study of ϒ production in pPb collisions at √sNN=8.16 TeV

引用

Journal of High Energy Physics 2018年第11期2018卷 1页

作者： Aaij, R. Abellán Beteta, C. Adeva, B. Adinolfi, M. aidala, C.A. Ajaltouni, Z. Akar, S. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d’Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Back, J.J. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barsuk, S. Barter, W. Bartolini, M. Baryshnikov, F. Batozskaya, V. Batsukh, B. Battig, A. Battista, V. Bay, A. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Belin, S. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. van Beuzekom, M. Bezshyiko, Ia. Bhasin, S. Bhom, J. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boente Garcia, O. Boettcher, T. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bozzi, C. Braun, S. Brodski, M. Brodzicka, J. Brossa Gonzalo, A. Brundu, D. Buchanan, E. Buonaura, A. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Coelho, J.A.B. Cogan, J. Cogneras, E. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Coombs, G. Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China Institute Of High Energy Physics (ihep) Beijing China Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Milano Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam Amsterdam Netherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland National Center for Nuclear Research (NCBJ) Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest

The production of ϒ(nS) mesons (n = 1, 2, 3) in pPb and Pbp collisions at a centre-of-mass energy per nucleon pair sNN=8.16 TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb⁻¹. The ϒ(nS) mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise the differential production cross-sections of the ϒ(1S) and ϒ(2S) states, their forward-to-backward ratios and nuclear modification factors. The measurements are performed as a function of the transverse momentum p_T and rapidity in the nucleon-nucleon centre-of-mass frame y^* of the ϒ(nS) states, in the kinematic range p_T < 25 GeV/c and 1.5 < y^* < 4.0 (−5.0 < y^* < −2.5) for pPb (Pbp) collisions. In addition, production cross-sections for ϒ(3S) are measured integrated over phase space and the production ratios between all three ϒ(nS) states are determined. Suppression for bottomonium in proton-lead collisions is observed, which is particularly visible in the ratios. The results are compared to theoretical models.[Figure not available: see fulltext.] © 2018, The Author(s).

关键词： Heavy Ion Experiments

来源：评论

学校读者我要写书评

暂无评论

Believe it today or tomorrow? Detecting untrustworthy information from dynamic multi-source data

Believe it today or tomorrow? Detecting untrustworthy inform...

引用

SIAM International Conference on data Mining 2015, SDM 2015

作者： Xiao, Houping Li, Yaliang Gao, Jing Wang, Fei Ge, Liang Fan, Wei Vu, Long H. Turaga, Deepak S. Department of Computer Science and Engineering SUNY Buffalo United States Department of Computer Science and Engineering University of Connecticut United States Google United States Baidu Big Data Lab. United States IBM T.J. Watson Research Center United States

ISBN: (纸本)9781510811522

A vast ocean of data is collected every day, and numerous applications call for the extraction of actionable insights from data. One important task is to detect untrustworthy information because such information usually indicates critical, unusual, or suspicious activities. In this paper, we study the important problem of detecting untrustworthy information from a novel perspective of correlating and comparing multiple sources that describe the same set of items. Different from existing work, we recognize the importance of time dimension in modeling the commonalities among multiple sources. We represent dynamic multi-source data as tensors and develop a joint non-negative tensor factorization approach to capture the common patterns across sources. We then conduct a comparison between source input and common patterns to identify inconsistencies as an indicator of untrustworthiness. An incremental factorization approach is developed to improve the computational efficiency on dynamically arriving data. We also propose a method to handle data sparseness. Experiments are conducted on hotel rating, network traffic flow, and weather forecast data that are collected from multiple sources. Results demonstrate the advantages of the proposed approach in detecting inconsistent and untrustworthy information. Copyright © SIAM.

关键词： Tensors

来源：评论

学校读者我要写书评

暂无评论

MODULAR SENSOR SYSTEM (MSS) FOR URBAN aiR POLLUTION MONITORING

MODULAR SENSOR SYSTEM (MSS) FOR URBAN AIR POLLUTION MONITORI...

引用

IEEE Sensors

作者： Wei-Ying Yi Kwong-Sak Leung Yee Leung Mei-Ling Meng Terrence Mak Institute of Future Cities Department of Computer Science and Engineering Stanley Ho Big Data Decision Analytics Research Center The Chinese University of Hong Kong China Department of Systems Engineering and Engineering Management Department of Electronics and Computer Science University of Southampton UK

air pollution attracts extensive attention globally due to its critical impacts on human life. Monitoring systems providing real-time micro-level pollution information have been developed to provide authorities with data to mitigate these impacts. However, current systems are usually application-specific with fixed hardware and software configurations. They are inconvenient in maintenance, infeasible in reconfiguration, and unexpandable in sensing capabilities. This paper proposes a novel Modular Sensor System (MSS), which aims at tackling these issues by adopting the proposed Universal Sensor Interface (USI) and modular design in a sensor node. A compact MSS senor node with expandable plug-and-play sensor modules and multiple Wireless Sensor Networks (WSNs) compatibility is implemented and evaluated. Results indicate that MSS sensor node can be deployed in different scenarios while dynamically adapting to reconfigurations and monitoring air pollution at low concentration levels with high energy efficiency. We anticipate that MSS is able to relax the efforts on system maintenance, adaptation, and evolution in real-life large-scale deployment situation.

关键词： plug-and-play air pollution monitoring wireless sensor network modular sensor node

来源：评论

学校读者我要写书评

暂无评论

First M87 event horizon telescope results. I. The shadow of the supermassive black hole

arXiv

引用

arXiv 2019年

作者： Akiyama, Kazunori Alberdi, Antxon Alef, Walter Asada, Keiichi Azulay, Rebecca Baczko, Anne-Kathrin Ball, David Baloković, Mislav Barrett, John Bintley, Dan Blackburn, Lindy Boland, Wilfred Bouman, Katherine L. Bower, Geoffrey C. Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broderick, Avery E. Broguiere, Dominique Bronzwaer, Thomas Byun, Do-Young Carlstrom, John E. Chael, Andrew Chan, Chi-kwan Chatterjee, Shami Chatterjee, Koushik Chen, Ming-Tang Chen, Yongjun Cho, Ilje Christian, Pierre Conway, John E. Cordes, James M. Crew, Geoffrey B. Cui, Yuzhu Davelaar, Jordy de Laurentis, Mariafelicia Deane, Roger Dempsey, Jessica Desvignes, Gregory Dexter, Jason Doeleman, Sheperd S. Eatough, Ralph P. Falcke, Heino Fish, Vincent L. Fomalont, Ed Fraga-Encinas, Raquel Freeman, William T. Friberg, Per Fromm, Christian M. Gómez, José L. Galison, Peter Gammie, Charles F. García, Roberto Gentaz, Olivier Georgiev, Boris Goddi, Ciriaco Gold, Roman Gu, Minfeng Gurwell, Mark Hada, Kazuhiro Hecht, Michael H. Hesper, Ronald Ho, Luis C. Ho, Paul Honma, Mareki Huang, Chih-Wei L. Huang, Lei Hughes, David H. Ikeda, Shiro Inoue, Makoto Issaoun, Sara James, David J. Jannuzi, Buell T. Janssen, Michael Jeter, Britton Jiang, Wu Johnson, Michael D. Jorstad, Svetlana Jung, Taehyun Karami, Mansour Karuppusamy, Ramesh Kawashima, Tomohisa Keating, Garrett K. Kettenis, Mark Kim, Jae-Young Kim, Junhan Kim, Jongsoo Kino, Motoki Koay, Jun Yi Koch, Patrick M. Koyama, Shoko Kramer, Michael Kramer, Carsten Krichbaum, Thomas P. Kuo, Cheng-Yu Lauer, Tod R. Lee, Sang-Sung Li, Yan-Rong Li, Zhiyuan Lindqvist, Michael Liu, Kuo Liuzzo, Elisabetta Lo, Wen-Ping Lobanov, Andrei P. Loinard, Laurent Lonsdale, Colin Lu, Ru-Sen National Radio Astronomy Observatory 520 Edgemont Road CharlottesvilleVA22903 United States Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States National Astronomical Observator of Ja an 2-21-1 Osawa Mitaka Tok o Ja an181-8588 Japan Black Hole Initiative at Harvard Universit 20 Garden Street Cambrid eMA02138 United States Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n GranadaE-18008 Spain Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Institute of Astronomy and Astrophysics Academia Sinica 11F of Astronomy-Mathematics Building AS/NTU No. 1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan Departament d’Astronomia i Astrofísica Universitat de València C. Dr. Moliner 50 Burjassot ValènciaE-46100 Spain Observatori Astronòmic Universitat de València C. Catedrático José Beltrán 2 Paterna ValènciaE-46980 Spain Steward Observatory Department of Astronomy University of Arizona 933 N. Cherry Ave TucsonAZ85721 United States Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States East Asian Observatory 660 N. A’ohoku Pl. HiloHI96720 United States PO Box 9513 Leiden2300 RA Netherlands California Institute of Technolo 1200 East California Boulevard PasadenaCA91125 United States Institute of Astronom Astro h sics Academia Sinica 645 N A’ohoku Place HiloHI96720 United States Institut de Radioastronomie Millimétri ue 300 rue de la Piscine Saint Martin d’HèresF-38406 France Radboud University P.O. Box 9010 Nijmegen6500 GL Netherlands Perimeter Institute for Theoretical Ph sics 31 Caroline Street North WaterlooONN2L 2Y5 Canada De artment of Ph sics Universit of Waterloo 200 Universit Avenue West WaterlooONN2L 3G1 Canada Waterloo Centre for Astrophysics University of Waterloo WaterlooONN2L 3G1 Canada Korea Astronomy and Space Science Institute Daedeok-daero 776 Yuseong-gu Daejeon34055 Korea

When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study this phenomenon, we have assembled the Event Horizon Telescope, a global very long baseline interferometry array observing at a wavelength of 1.3 mm. This allows us to reconstruct event-horizon-scale images of the supermassive black hole candidate in the center of the giant elliptical galaxy M87. We have resolved the central compact radio source as an asymmetric bright emission ring with a diameter of 42 ± 3 μas, which is circular and encompasses a central depression in brightness with a flux ratio 10:1. The emission ring is recovered using different calibration and imaging schemes, with its diameter and width remaining stable over four different observations carried out in different days. Overall, the observed image is consistent with expectations for the shadow of a Kerr black hole as predicted by general relativity. The asymmetry in brightness in the ring can be explained in terms of relativistic beaming of the emission from a plasma rotating close to the speed of light around a black hole. We compare our images to an extensive library of ray-traced general-relativistic magnetohydrodynamic simulations of black holes and derive a central mass of M = (6.5 ± 0.7) × 109 Me. Our radio-wave observations thus provide powerful evidence for the presence of supermassive black holes in centers of galaxies and as the central engines of active galactic nuclei. They also present a new tool to explore gravity in its most extreme limit and on a mass scale that was so far not accessible. Copyright © 2019, The Authors. All rights reserved.

关键词： Gravitation

来源：评论

学校读者我要写书评

暂无评论

Measurement of the ratio of branching fractions of the decays Λ0b→ ψ(2S)Λ and Λ0b→ J/ψΛ

arXiv

引用

arXiv 2019年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. Alfonso Ali, S. Alkhazov, G. Cartelle, P. Alvarez Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. Romeu, J. Arnau Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bordyuzhin, I. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Gomez, M. Calvo Camboni, A. Campana, P. Perez, D.H. Campora Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Akiba, K. Carvalho Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Cindolo, F. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Coombs, G. Coquereau, S. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Milano Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidade de Santi

Using pp collisions corresponding to 3 fb−1 integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, the ratio of branching fractions B(Λ0b → ψ(2S)Λ)/B(Λ0b → J/ψΛ) = 0.513 ± 0.023 (stat) ± 0.016 (syst) ± 0.011 (B) is determined. The first uncertainty is statistical, the second is systematic and the third is due to the external branching fractions used. Copyright © 2019, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions

arXiv

引用

arXiv 2018年

作者： Adare, A. Afanasiev, S. aidala, C. Ajitanand, N.N. Akiba, Y. Akimoto, R. Al-Bataineh, H. Alexander, J. Alfred, M. Al-Jamel, A. Al-Ta'ani, H. Angerami, A. Aoki, K. Apadula, N. Aphecetche, L. Aramaki, Y. Armendariz, R. Aronson, S.H. Asai, J. Asano, H. Aschenauer, E.C. Atomssa, E.T. Averbeck, R. Awes, T.C. Azmoun, B. Babintsev, V. Bagoly, A. Bai, M. Baksay, G. Baksay, L. Baldisseri, A. Bannier, B. Barish, K.N. Barnes, P.D. Bassalleck, B. Basye, A.T. Bathe, S. Batsouli, S. Baublis, V. Bauer, F. Baumann, C. Baumgart, S. Bazilevsky, A. Belikov, S. Belmont, R. Bennett, R. Berdnikov, A. Berdnikov, Y. Bhom, J.H. Bickley, A.A. Bjorndal, M.T. Blau, D.S. Boer, M. Boissevain, J.G. Bok, J.S. Borel, H. Boyle, K. Brooks, M.L. Brown, D.S. Bryslawskyj, J. Bryslawskyj, J. Bucher, D. Buesching, H. Bumazhnov, V. Bunce, G. Burward-Hoy, J.M. Butsyk, S. Camacho, C.M. Campbell, S. Canoa Roman, V. Caringi, A. Castera, P. Chai, J.-S. Chang, B.S. Chang, W.C. Charvet, J.-L. Chen, C.-H. Chernichenko, S. Chi, C.Y. Chiba, J. Chiu, M. Choi, I.J. Choi, J.B. Choi, S. Choudhury, R.K. Christiansen, P. Chujo, T. Chung, P. Churyn, A. Chvala, O. Cianciolo, V. Citron, Z. Cleven, C.R. Cobigo, Y. Cole, B.A. Comets, M.P. Conesa del Valle, Z. Connors, M. Constantin, P. Csanád, M. Csörgo, T. Dahms, T. Dairaku, S. Danchev, I. Danley, T.W. Das, K. Datta, A. Daugherity, M.S. David, G. Dayananda, M.K. Deaton, M.B. Dehmelt, K. Delagrange, H. Denisov, A. D'Enterria, D. Deshpande, A. Desmond, E.J. Dharmawardane, K.V. Dietzsch, O. Ding, L. Dion, A. Do, J.H. Donadelli, M. D'Orazio, L. Drachenberg, J.L. Drapier, O. Drees, A. Drees, K.A. Dubey, A.K. Durham, J.M. Durum, A. Dutta, D. Dzhordzhadze, V. Edwards, S. Efremenko, Y.V. Egdemir, J. Ellinghaus, F. Emam, W.S. Engelmore, T. Enokizono, A. En'yo, H. Espagnon, B. Esumi, S. Eyser, K.O. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Fleuret, F. Fokin, S.L. Forestier, B. Abilene Christian University AbileneTX79699 United States Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Ovocný trh 5 Praha 1 Prague116 36 Czech Republic Chonbuk National University Jeonju561-756 Korea Republic of Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New YorkNY10027 United States Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Dapnia CEA Saclay Gif-sur-YvetteF-91191 France Debrecen University Egyetem tér 1 DebrecenH-4010 Hungary ELTE Eötvös Loránd University Pázmány P. s. 1/A BudapestH-1117 Hungary Eszterházy Károly University Károly Róbert Campus Mátrai út 36 GyöngyösH-3200 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida Institute of Technology MelbourneFL32901 United States Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hanyang University Seoul133-792 Korea Republic of Hiroshima University Kagamiyama Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States IHEP Protvino State Research Center of Russian Fede

The PHENIX collaboration presents first measurements of low-momentum (0.4 √sNN =39 and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au+Au collisions at √sNN =200. Analyzing the photon yield as a function of the experimental observable dNch/dη reveals that the low-momentum (>1 GeV/c) direct-photon yield dNγdir/dη is a smooth function of dNch/dη and can be well described as proportional to (dNch/dη)α with α∼1.25. This new scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and Large Hadron Collider, for centrality selected samples, as well as for different, A+A collision systems. At a given beam energy the scaling also holds for high pT (> 5 GeV/c) but when results from different collision energies are compared, an additional √sNN -dependent multiplicative factor is needed to describe the integrated-direct-photon yield. Copyright © 2018, The Authors. All rights reserved.

关键词： Germanium alloys

来源：评论

学校读者我要写书评

暂无评论

Detection of image copy-move forgery using local intensity order pattern

引用

Tongxin Xuebao/Journal on Communications 2016年 37卷 132-139页

作者： Lin, Jing Huang, Tian-Qiang Lin, Ling-Peng Li, Xiao-Chen School of Mathematics and Computer Science Fujian Normal University Fuzhou350007 China Faculty of Software Fujian Normal University Fuzhou350007 China Fujian Provincial University Engineering Research Center of Big Data Analysis and Application Fujian Normal University Fuzhou350007 China

Copy-move forgery was one of the most simple and common way of image manipulations. To improve the robustness of most existing copy-move forgery detections, a new method based on local intensity order pattern was proposed. First, the LIOP feature descriptors were exacted from the inspected image. Then the angular cosine of feature descriptors were used to measure the similarity, and the stable matching points were found according to the distance ratio threshold of the nearest neighbor point to the second nearest neighbor. Finally, the space distance of the matching points were calculated to remove the false matching points. Extensive experimental results were presented to confirm that the proposed method is not only able to effectively identify and locate the altered area, but also have high accuracy and robust to scaling, rotation, brightness change and some post-processing, such as Gaussian blur, additive white Gaussian noise and JPEG compression. © 2016, Editorial Board of Journal on Communications. All right reserved.

关键词： White noise

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：