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Investigations of the dielectronic recombination of phosphorus-like tin at CSRm

Chinese Physics B 2018年第6期27卷 268-273页

作者： Xin Xu Shu-Xing Wang Zhong-Kui Huang Wei-Qiang Wen Han-Bing Wang Tian-Heng Xu Xiao-Ya Chuai Li-Jun Dou Wei-Qing Xu Chong-Yang Chen Chuan-Ying Li Jian-Guo Wang Ying-Long Shi Chen-Zhong Dong Li-Jun Mao Da-Yu Yin Jie Li Jian-Cheng Yang You-Jin Yuan Xin-Wen Ma and Lin-Fan Zhu Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Physical Sciences University of the Chinese Academy of Sciences Beijing 100049 China Shanghai EBIT Laboratory Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application （MOE） Fudan University Shanghai 200433 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China 7 The Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China 8Institute for Fundamental Physics Tianshui Normal University Tianshui 741000 China 9 Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

The electron–ion recombination for phosphorus-like^（112） Sn^（35＋）has been measured at the main cooler storage ring of the Heavy Ion Research Facility in Lanzhou, China, employing an electron–ion merged-beams technique. The absolute total recombination rate coefficients for electron–ion collision energies from 0 e V–14 e V are presented. Theoretical calculations of recombination rate coefficients were performed using the Flexible Atomic Code to compare with the experimental results. The contributions of dielectronic recombination and trielectronic recombination on the experimental rate coefficients have been identified with the help of the theoretical calculation. The present results show that the trielectronic recombination has a substantial contribution to the measured electron–ion recombination spectrum of^（112）Sn^（35＋）. Although a reasonable agreement is found between the experimental and theoretical results the precise calculation of the electron–ion recombination rate coefficients for M-shell ions is still challengeable for the current theory.

关键词： dielectronic recombination trielectronic recombination storage ring electron cooling

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Functional outlier detection and taxonomy by sequential transformations

arXiv

引用

arXiv 2018年

作者： Dai, Wenlin Mrkvička, Tomáš Sun, Ying Genton, Marc G. Statistics Program King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Department of Applied Mathematics and Informatics Faculty of Economics University of South Bohemia Studentská 13 České Budějovice37005 Czech Republic

Functional data analysis can be seriously impaired by abnormal observations, which can be classified as either magnitude or shape outliers based on their way of deviating from the bulk of data. Identifying magnitude outliers is relatively easy, while detecting shape outliers is much more challenging. We propose turning the shape outliers into magnitude outliers through data transformation and detecting them using the functional boxplot. Besides easing the detection procedure, applying several transformations sequentially provides a reasonable taxonomy for the flagged outliers. A joint functional ranking, which consists of several transformations, is also defined here. Simulation studies are carried out to evaluate the performance of the proposed method using different functional depth notions. Interesting results are obtained in several practical applications. Copyright © 2018, The Authors. All rights reserved.

关键词： Statistics

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Objective comparison of methods to decode anomalous diffusion

arXiv

引用

arXiv 2021年

作者： Muñoz-Gil, Gorka Volpe, Giovanni Garcia-March, Miguel Angel Aghion, Erez Argun, Aykut Hong, Chang Beom Bland, Tom Bo, Stefano Conejero, J. Alberto Firbas, Nicolás Orts, Òscar Garibo Gentili, Alessia Huang, Zihan Jeon, Jae-Hyung Kabbech, Hélène Kim, Yeongjin Kowalek, Patrycja Krapf, Diego Loch-Olszewska, Hanna Lomholt, Michael A. Masson, Jean-Baptiste Meyer, Philipp G. Park, Seongyu Requena, Borja Smal, Ihor Song, Taegeun Szwabinski, Janusz Thapa, Samudrajit Verdier, Hippolyte Volpe, Giorgio Widera, Arthur Lewenstein, MacIej Metzler, Ralf Anzo, Carlo 08860 Spain Department of Physics University of Gothenburg Origovägen 6B GothenburgSE-41296 Sweden Instituto Universitario de Matemática Pura y Aplicada Universitat Politècnica de València Spain Max Planck Institute for the Physics of Complex Systems Nöthnitzer Straße 38 DresdenDE-01187 Germany Department of Physics Pohang University of Science and Technology Pohang37673 Korea Republic of Francis Crick Institute 1 Midland Road LondonNW1 1AT United Kingdom Department of Chemistry University College London 20 Gordon Street LondonWC1H 0AJ United Kingdom School of Physics and Electronics Hunan University Changsha410082 China Department of Cell Biology Erasmus Mc Rotterdam Netherlands Faculty of Pure and Applied Mathematics Hugo Steinhaus Center Wroclaw University of Science and Technology Wroclaw Poland Department of Electrical and Computer Engineering Colorado State University Fort CollinsCO80523 United States PhyLife Department of Physics Chemistry and Pharmacy University of Southern Denmark Odense MDK-5230 Denmark Institut Pasteur Decision and Bayesian Computation Lab Paris France Center for Ai and Natural Sciences Korea Institute for Advanced Study Seoul Korea Republic of Institute for Physics and Astronomy University of Potsdam Karl-Liebknecht-Str 24/25 Potsdam-GolmD-14476 Germany Sackler Center for Computational Molecular and Materials Science Tel Aviv University Tel Aviv69978 Israel School of Mechanical Engineering Tel Aviv University Tel Aviv69978 Israel Institut Pasteur Decision and Bayesian Computation Lab Paris France Department of Physics Research Center Optimas Technische Universität Kaiserslautern Kaiserslautern67663 Germany Icrea Pg. Lluís Companys 23 Barcelona08010 Spain C. de la Laura 13 Vic08500 Spain

Deviations from Brownian motion leading to anomalous diffusion are ubiquitously found in transport dynamics, playing a crucial role in phenomena from quantum physics to life sciences. The detection and characterization of anomalous diffusion from the measurement of an individual trajectory are challenging tasks, which traditionally rely on calculating the mean squared displacement of the trajectory. However, this approach breaks down for cases of important practical interest, e.g., short or noisy trajectories, ensembles of heterogeneous trajectories, or non-ergodic processes. Recently, several new approaches have been proposed, mostly building on the ongoing machine-learning revolution. Aiming to perform an objective comparison of methods, we gathered the community and organized an open competition, the Anomalous Diffusion challenge (AnDi). Participating teams independently applied their own algorithms to a commonly-defined dataset including diverse conditions. Although no single method performed best across all scenarios, the results revealed clear differences between the various approaches, providing practical advice for users and a benchmark for developers. Copyright © 2021, The Authors. All rights reserved.

关键词： Trajectories

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A surrogate modeling approach for crack pattern prediction in peridynamics 19th

A surrogate modeling approach for crack pattern prediction i...

引用

19th AIAA Non-Deterministic Approaches Conference, 2017

作者： Stoyanov, Miroslav Seleson, Pablo Webster, Clayton Department of Computational and Applied Mathematics Oak Ridge National Laboratory One Bethel Valley Road P.O. Box 2008 MS-6211 Oak RidgeTN37831-6211 United States

ISBN: (纸本)9781624104527

Risk assessment in may areas of civil, mechanical, and aerospace engineering requires statistical analysis of crack formation and propagation in materials, which in turn relies on complex and computationally expensive models. Fast surrogate models are needed to alleviate the computational burden;however, the discontinuous nature of fracture dynamics presents a major challenge to most approximation methods. We introduce an approach based on reduced basis and sparse grids induced by piece-wise constant functions, which does not require assumptions on the regularity of the model response in either parameter or real space. Using a sequence of random samples (i.e., solutions to the full model), we construct a small set of basis functions that capture the variability of the displacement field for different values of the model parameters. We expand the displacement field as a linear combination of these basis functions and construct an approximation to the expansion coefficients using an 2 projection onto an adaptive sparse grid basis induced by piece-wise constant functions. We demonstrate the viability of our approach with an application to a peridynamics model of crack branching in brittle soda lime glass. © 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Risk assessment

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Gait transitions in a phase oscillator model of an insect central pattern generator

arXiv

引用

arXiv 2017年

作者： Aminzare, Zahra Srivastava, Vaibhav Holmes, Philip Program in Applied and Computational Mathematics Department of Mechanical and Aerospace Engineering Princeton University NJ United States Department of Electrical and Computer Engineering Michigan State University LansingMI United States Program in Applied and Computational Mathematics Department of Mechanical and Aerospace Engineering Princeton Neuroscience Institute Princeton University NJ United States

Legged locomotion involves various gaits. It has been observed that fast running insects (cockroaches) employ a tripod gait with three legs lifted off the ground simultaneously in swing, while slow walking insects (stick insects) use a tetrapod gait with two legs lifted off the ground simultaneously. Fruit flies use both gaits and exhibit a transition from tetrapod to tripod at intermediate speeds. Here we study the effect of stepping frequency on gait transition in an ion-channel bursting neuron model in which each cell represents a hemi-segmental thoracic circuit of the central pattern generator. Employing phase reduction, we collapse the network of bursting neurons represented by 24 ordinary differential equations to 6 coupled nonlinear phase oscillators, each corresponding to a sub-network of neurons controlling one leg. Assuming that the left and right legs maintain constant phase differences (contralateral symmetry), we reduce from 6 equations to 3, allowing analysis of a dynamical system with 2 phase differences defined on a torus. We show that bifurcations occur from multiple stable tetrapod gaits to a unique stable tripod gait as speed increases. Finally, we consider gait transitions in two sets of data fitted to freely walking fruit flies.34C16, 34C60, 37G10, 92B20, 92C2034C16, 34C60, 37G10, 92B20, 92C20 Copyright © 2017, The Authors. All rights reserved.

关键词： Bifurcation (mathematics)

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Weak lensing combined with the kinetic Sunyaev Zel'dovich effect: A study of baryonic feedback

arXiv

引用

arXiv 2024年

作者： Bigwood, L. Amon, A. Schneider, A. Salcido, J. McCarthy, I.G. Preston, C. Sanchez, D. Sijacki, D. Schaan, E. Ferraro, S. Battaglia, N. Chen, A. Dodelson, S. Roodman, A. Pieres, A. Ferté, A. Alarcon, A. Drlica-Wagner, A. Choi, A. Navarro-Alsina, A. Campos, A. Ross, A.J. Carnero Rosell, A. Yin, B. Yanny, B. Sánchez, C. Chang, C. Davis, C. Doux, C. Gruen, D. Rykoff, E.S. Huff, E.M. Sheldon, E. Tarsitano, F. Andrade-Oliveira, F. Bernstein, G.M. Giannini, G. Diehl, H.T. Huang, H. Harrison, I. Sevilla-Noarbe, I. Tutusaus, I. Elvin-Poole, J. McCullough, J. Zuntz, J. Blazek, J. DeRose, J. Cordero, J. Prat, J. Myles, J. Eckert, K. Bechtol, K. Herner, K. Secco, L.F. Gatti, M. Raveri, M. Carrasco Kind, M. Becker, M.R. Troxel, M.A. Jarvis, M. MacCrann, N. Friedrich, O. Alves, O. Leget, P.-F. Chen, R. Rollins, R.P. Wechsler, R.H. Gruendl, R.A. Cawthon, R. Allam, S. Bridle, S.L. Pandey, S. Everett, S. Shin, T. Hartley, W.G. Fang, X. Zhang, Y. Aguena, M. Annis, J. Bacon, D. Bertin, E. Bocquet, S. Brooks, D. Carretero, J. Castander, F.J. da Costa, L.N. Pereira, M.E.S. De Vicente, J. Desai, S. Doel, P. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gaztanaga, E. Gutierrez, G. Hinton, S.R. Hollowood, D.L. Honscheid, K. Huterer, D. James, D.J. Kuehn, K. Lahav, O. Lee, S. Marshall, J.L. Mena-Fernández, J. Miquel, R. Muir, J. Paterno, M. Plazas Malagón, A.A. Porredon, A. Romer, A.K. Samuroff, S. Sanchez, E. Sanchez Cid, D. Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M.E.C. Tarle, G. To, C. Weaverdyck, N. Weller, J. Wiseman, P. Yamamoto, M. Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Kavli Institute for Cosmology Cambridge Madingley Road CambridgeCB3 OHA United Kingdom Department of Astrophysical Sciences Princeton University Peyton Hall PrincetonNJ08544 United States Institute for Computational Science University of Zurich Winterthurerstrasse 190 ZurichCH-8057 Switzerland Astrophysics Research Institute Liverpool John Moores University 146 Brownlow Hill LiverpoolL3 5RF United Kingdom Centre for Energy Environmental and Technological Research Av. Complutense 40 Moncloa - Aravaca Madrid28040 Spain Kavli Institute for Particle Astrophysics and Cosmology 382 Via Pueblo Mall StanfordCA94305-4060 United States SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Berkeley Center for Cosmological Physics Department of Physics University of California BerkeleyCA94720 United States Department of Astronomy Cornell University IthacaNY14853 United States Department of Physics University of Michigan Ann ArborMI48109 United States UTIAS The University of Tokyo Chiba Kashiwa277-8583 Japan Department of Physics Carnegie Mellon University PittsburghPA15312 United States NSF AI Planning Institute for Physics of the Future Carnegie Mellon University PittsburghPA15213 United States Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Observatório Nacional Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Argonne National Laboratory 9700 South Cass Avenue LemontIL60439 United States Campus UAB Carrer de Can Magrans s/n Barcelona08193 Spa

Extracting precise cosmology from weak lensing surveys requires modelling the non-linear matter power spectrum, which is suppressed at small scales due to baryonic feedback processes. However, hydrodynamical galaxy formation simulations make widely varying predictions for the amplitude and extent of this effect. We use measurements of Dark Energy Survey Year 3 weak lensing (WL) and Atacama Cosmology Telescope DR5 kinematic Sunyaev-Zel'dovich (kSZ) to jointly constrain cosmological and astrophysical baryonic feedback parameters using a flexible analytical model, 'baryonification'. First, using WL only, we compare the S8 constraints using baryonification to a simulation-calibrated halo model, a simulation-based emulator model and the approach of discarding WL measurements on small angular scales. We find that model flexibility can shift the value of S8 and degrade the uncertainty. The kSZ provides additional constraints on the astrophysical parameters and shifts (Equation presented) a higher value than attained using the WL-only analysis. We measure the suppression of the non-linear matter power spectrum using WL + kSZ and constrain a mean feedback scenario that is more extreme than the predictions from most hydrodynamical simulations. We constrain the baryon fractions and the gas mass fractions and find them to be generally lower than inferred from X-ray observations and simulation predictions. We conclude that the WL + kSZ measurements provide a new and complementary benchmark for building a coherent picture of the impact of gas around galaxies across observations. © 2024, CC BY.

关键词： Cosmology

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Experimental Demonstration of Spintronic Broadband Microwave Detectors and Their Capability for Powering Nanodevices

引用

Physical Review applied 2019年第1期11卷 014022-014022页

作者： Bin Fang Mario Carpentieri Steven Louis Vasyl Tiberkevich Andrei Slavin Ilya N. Krivorotov Riccardo Tomasello Anna Giordano Hongwen Jiang Jialin Cai Yaming Fan Zehong Zhang Baoshun Zhang Jordan A. Katine Kang L. Wang Pedram Khalili Amiri Giovanni Finocchio Zhongming Zeng Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences Ruoshui Road 398 Suzhou 215123 P. R. China Department of Electrical and Information Engineering Polytechnic of Bari Bari 70125 Italy Department of Electrical and Computer Engineering Oakland University Rochester Michigan 48309 USA Department of Physics Oakland University Rochester Michigan 48309 USA Department of Physics and Astronomy University of California Irvine California 92697 USA Institute of Applied and Computational Mathematics FORTH GR-70013 Heraklion-Crete Greece Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina Messina 98166 Italy Department of Physics and Astronomy University of California Los Angeles California 90095 USA Western Digital San Jose California 95138 USA Department of Electrical and Computer Engineering University of California Los Angeles California 90095 USA Department of Electrical Engineering and Computer Science Northwestern University Evanston Illinois 60208 USA

Nonlinear dynamics has been the key ingredient to improve the performance, in terms of sensitivity, of biased resonant spintronic diodes beyond their semiconductor counterparts. We experimentally demonstrate a nonlinear regime broadband detection for nanoscale spintronic diodes (NSD) where the rectification properties are independent of the input microwave frequency, and compare the device performance with the state of the art Schottky diode for low-power rectification. This regime is achieved in magnetic tunnel junctions with a canted magnetization of the free layer. We further show that the developed NSD provides sufficient dc voltage to supply a low-power nanodevice − a black phosphorus photosensor. Our results could pave the way for using spintronic detectors as building blocks for self-powered nanosystems, such as implantable biomedical devices, wireless sensors, and portable electronics.

关键词： Magnetization dynamics Optoelectronics Spin transfer torque Spintronics Diodes Energy applications Magnetic tunnel junctions Microwave techniques

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A search for faint resolved galaxies beyond the Milky Way in DES Year 6: A new faint, diffuse dwarf satellite of NGC 55

arXiv

引用

arXiv 2023年

作者： McNanna, Mitch Bechtol, K. Mau, S. Nadler, E.O. Medoff, J. Drlica-Wagner, A. Cerny, W. Crnojević, D. Mutlu-Pakdıl, B. Vivas, A.K. Pace, A.B. Carlin, J.L. Collins, M.L.M. Ferguson, P.S. Martínez-Delgado, D. Martínez-Vázquez, C.E. Noel, N.E.D. Riley, A.H. Sand, D.J. Smercina, A. Tollerud, E. Wechsler, R.H. Abbott, T.M.C. Aguena, M. Alves, O. Bacon, D. Bom, C.R. Brooks, D. Burke, D.L. Carballo-Bello, J.A. Carnero Rosell, A. Carretero, J. da Costa, L.N. Davis, T.M. De Vicente, J. Diehl, H.T. Doel, P. Ferrero, I. Frieman, J. Giannini, G. Gruen, D. Gutierrez, G. Gruendl, R.A. Hinton, S.R. Hollowood, D.L. Honscheid, K. James, D.J. Kuehn, K. Marshall, J.L. Mena-Fernández, J. Miquel, R. Pereira, M.E.S. Pieres, A. Plazas Malagón, A.A. Sakowska, J.D. Sanchez, E. Sanchez Cid, D. Santiago, B. Sevilla-Noarbe, I. Smith, M. Stringfellow, G.S. Suchyta, E. Swanson, M.E.C. Tarle, G. Weaverdyck, N. Wiseman, And P. Department of Physics University of Wisconsin-Madison 1150 University Avenue MadisonWI53706 United States Department of Physics Stanford University 382 Via Pueblo Mall StanfordCA94305 United States Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States Carnegie Observatories 813 Santa Barbara Street PasadenaCA91101 United States Department of Physics & Astronomy University of Southern California Los AngelesCA90007 United States Department of Astronomy and Astrophysics University of Chicago ChicagoIL60637 United States Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Department of Astronomy Yale University New HavenCT06520 United States Department of Physics and Astronomy University of Tampa 401 West Kennedy Boulevard TampaFL33606 United States Department of Physics and Astronomy Dartmouth College HanoverNH03755 United States Cerro Tololo Inter-American Observatory NSF’s NOIRLab Casilla 603 La Serena Chile McWilliams Center for Cosmology Carnegie Mellon University 5000 Forbes Ave PittsburghPA15213 United States Vera C. Rubin Observatory/AURA 950 N Cherry Ave TucsonAZ85719 United States Department of Physics University of Surrey GuildfordGU2 7XH United Kingdom Instituto de Astrofísica de Andalucía CSIC Glorieta de la Astronomía GranadaE-18080 Spain Gemini Observatory NSF’s NOIRLab 670 N. A’ohoku Place HiloHI96720 United States Institute for Computational Cosmology Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721-0065 United States Department of Astronomy University of Washington Box 351580 U.W. SeattleWA98195-1580 United States Space Telescope Science Institute 3700 San Martin Dr. BaltimoreMD21218 United States

We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full six years of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to MV ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc respectively. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2−0.12+0.05 Mpc, a potential satellite of the Local Volume galaxy NGC 55, separated by 47 arcmin (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of −8.0−0.3+0.5 mag and an azimuthally averaged physical half-light radius of 2.2−0.4+0.5 kpc, making this one of the lowest surface brightness galaxies ever found with µ = 32.3 mag arcsec−2. This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host. Copyright © 2023, The Authors. All rights reserved.

关键词： Galaxies

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Connected power domination in graphs

arXiv

引用

arXiv 2017年

作者： Brimkov, Boris Mikesell, Derek Smith, Logan Department of Computational and Applied Mathematics Rice University HoustonTX77005 United States

The study of power domination in graphs arises from the problem of placing a minimum number of measurement devices in an electrical network while monitoring the entire network. A power dominating set of a graph is a set of vertices from which every vertex in the graph can be observed, following a set of rules for power system monitoring. In this paper, we study the problem of finding a minimum power dominating set which is connected;the cardinality of such a set is called the connected power domination number of the graph. We show that the connected power domination number of a graph is NP-hard to compute in general, but can be computed in linear time in cactus graphs and block graphs. We also give various structural results about connected power domination, including a cut vertex decomposition and a characterization of the effects of various vertex and edge operations on the connected power domination number. Finally, we present novel integer programming formulations for power domination, connected power domination, and power propagation time, and give computational *** Codes 05C69, 05C50, 05C57, 94C15 Copyright © 2017, The Authors. All rights reserved.

关键词： Graphic methods

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Scattering control for the wave equation with unknown wave speed

arXiv

引用

arXiv 2017年

作者： Caday, Peter de Hoop, Maarten V. Katsnelson, Vitaly Uhlmann, Gunther Department of Computational and Applied Mathematics Rice University Department of Mathematics University of Washington and Institute for Advanced Study Hong Kong University of Science and Technology

Consider the acoustic wave equation with unknown wave speed c, not necessarily smooth. We propose and study an iterative control procedure that erases the history of a wave field up to a given depth in a medium, without any knowledge of c. In the context of seismic or ultrasound imaging, this can be viewed as removing multiple reflections from normal-directed wavefronts.35L05, 35R30 Copyright © 2017, The Authors. All rights reserved.

关键词： Ultrasonic imaging

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