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Experimental Astronomy 2025年第3期59卷 1-111页

作者： rauer, Heike Aerts, Conny Cabrera, Juan deleuil, Magali Erikson, Anders Gizon, Laurent Goupil, Mariejo Heras, Ana Walloschek, Thomas Lorenzo-Alvarez, Jose Marliani, Filippo Martin-Garcia, César Mas-Hesse, J. Miguel O’rourke, Laurence Osborn, Hugh Pagano, Isabella Piotto, Giampaolo Pollacco, don ragazzoni, roberto ramsay, Gavin Udry, Stéphane Appourchaux, Thierry Benz, Willy Brandeker, Alexis Güdel, Manuel Janot-Pacheco, Eduardo Kabath, Petr Kjeldsen, Hans Min, Michiel Santos, Nuno Smith, Alexis Suarez, Juan-Carlos Werner, Stephanie C. Aboudan, Alessio Abreu, Manuel Acuña, Lorena Adams, Moritz Adibekyan, Vardan Affer, Laura Agneray, François Agnor, Craig Aguirre Børsen-Koch, Victor Ahmed, Saad Aigrain, Suzanne Al-Bahlawan, Ashraf Alcacera Gil, Ma de los Angeles Alei, Eleonora Alencar, Silvia Alexander, richard Alfonso-Garzón, Julia Alibert, Yann Allende Prieto, Carlos Almeida, Leonardo Alonso Sobrino, roi Altavilla, Giuseppe Althaus, Christian Alvarez Trujillo, Luis Alonso Amarsi, Anish Ammler-von Eiff, Matthias Amôres, Eduardo Andrade, Laerte Antoniadis-Karnavas, Alexandros António, Carlos Aparicio del Moral, Beatriz Appolloni, Matteo Arena, Claudio Armstrong, david Aroca Aliaga, Jose Asplund, Martin Audenaert, Jeroen Auricchio, Natalia Avelino, Pedro Baeke, Ann Baillié, Kevin Balado, Ana Ballber Balagueró, Pau Balestra, Andrea Ball, Warrick Ballans, Herve Ballot, Jerome Barban, Caroline Barbary, Gaële Barbieri, Mauro Barceló Forteza, Sebastià Barker, Adrian Barklem, Paul Barnes, Sydney Barrado Navascues, david Barragan, Oscar Baruteau, Clément Basu, Sarbani Baudin, Frederic Baumeister, Philipp Bayliss, daniel Bazot, Michael Beck, Paul G. Belkacem, Kevin Bellinger, Earl Benatti, Serena Benomar, Othman Bérard, diane Bergemann, Maria Bergomi, Maria Bernardo, Pierre Biazzo, Katia Bignamini, Andrea Bigot, Lionel Billot, Nicolas Binet, Martin Biondi, david Biondi, Federico Birch, Aaron C. Bitsch, Bertram Bluhm Ceballos, Paz Victoria Bódi, Attila Bognár, Zsófia Boisse, Isabelle Bolmont, Emeline Bonanno, Alfio Bonavita, Institut für Planetenforschung Deutsches Zentrum für Luft- und Raumfahrt DLR Rutherfordstrasse 2 Berlin 12489 Germany Fachbereich Geowissenschaften Institut für Geologische Freie Universität Berlin Malteserstr. 74-100 Berlin 12249 Germany Institute of Astronomy KU Leuven Leuven Belgium CNRS CNES LAM Aix Marseille University Marseille France Max Planck Institute for Solar System Research Göttingen Germany LESIA Paris Observatory PSL University Sorbonne University Paris Cité University CNRS Meudon France ESTEC European Space Agency Noordwijk Netherlands ESAC European Space Agency Madrid Spain Centro de Astrobiología CSIC-INTA Campus ESAC Madrid Spain Center for Space and Habitability University of Bern Bern Switzerland INAF - Osservatorio Astrofisico di Catania Catania Italy Department of Physics and Astronomy University of Padua Padua Italy Department of Physics University of Warwick Coventry United Kingdom Astronomical Observatory of Padova INAF - Italian National Institute for Astrophysics Padua Italy Armagh Observatory and Planetarium College Hill Armagh United Kingdom Geneve Observatory University of Geneve Geneve Switzerland IAS University of Paris-Saclay Orsay France AlbaNove University Centre Stockholm University Stockholm Sweden Department of Astrophysics University of Vienna Vienna Austria Department of Astronomy University of Sao Paulo Sao Paulo Brazil Astronomical Institute of the Czech Academy of Sciences Ondřejov Czech Republic Department of Physics and Astronomy Aarhus University Aarhus Denmark Institute for Space Research SRON Leiden Netherlands Instituto de Astrofísica e Ciências do Espaço CAUP Universidade do Porto Porto Portugal Departamento de Física e Astronomia Faculdade da Ci ncias Universidade do Porto Porto Portugal Mullard Space Science Laboratory University College London Holmbury Saint Mary United Kingdom Dept. Theoretical Physics and the Cosmos University of Granada Granada Spain Centre for Plan

PLATO (PLAnetary Transits and Oscillations of stars) is ESA’s M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to <2rEarth) around bright stars (<11 mag), including terrestrial planets in the habitable zone of solar-like stars. With the complement of radial velocity observations from the ground, planets will be characterised for their radius, mass, and age with high accuracy (5%, 10%, 10% for an Earth-Sun combination respectively). PLATO will provide us with a large-scale catalogue of well-characterised small planets up to intermediate orbital periods, relevant for a meaningful comparison to planet formation theories and to better understand planet evolution. It will make possible comparative exoplanetology to place our Solar system planets in a broader context. In parallel, PLATO will study (host) stars using asteroseismology, allowing us to determine the stellar properties with high accuracy, substantially enhancing our knowledge of stellar structure and evolution. The payload instrument consists of 26 cameras with 12cm aperture each. For at least four years, the mission will perform high-precision photometric measurements. Here we review the science objectives, present PLATO‘s target samples and fields, provide an overview of expected core science performance as well as a description of the instrument and the mission profile towards the end of the serial production of the flight cameras. PLATO is scheduled for a launch date end 2026. This overview therefore provides a summary of the mission to the community in preparation of the upcoming operational phases. © The Author(s) 2025.

关键词： Asteroseismology Exoplanets PLATO mission

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Novel Index Modulation Aided Non-Orthogonal Multiple Access for Visible Light Communication

Novel Index Modulation Aided Non-Orthogonal Multiple Access ...

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IEEE Global Communications Conference

作者： Tengjiao Wang Fang Yang Jian Song Department of Electronic Engineering Tsinghua University Beijing National Research Center for Information Science and Technology (BNRist) Beijing P. R. China Key Laboratory of Digital TV System of Guangdong Province and Shenzhen City Research Institute of Tsinghua University in Shenzhen Shenzhen P. R. China

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

In this paper, a novel index modulation aided non-orthogonal multiple access (NOMA) scheme is proposed for visi-ble light communication (VLC). Unlike the conventional NOMA schemes, the proposed scheme conveys information for different users through both the index-domain and constellation-domain symbols with the aid of index modulation, which is able to cancel the intra-cluster interference completely and avoid the use of successive interference cancellation to decrease computational complexity. The achievable multi-user sum rate of the proposed scheme is analyzed and a closed-form expression of the lower bound is derived. Then, an approximation is further obtained to realize accurate prediction of the achievable multiuser sum rate. Simulation results validate the accuracy of the approximation of the achievable sum rate and the superior performance of the proposed scheme.

关键词： Indexes Modulation NOMA Mutual information OFdM Light emitting diodes Interference

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The Extreme Space Weather Event of 1872 February: Sunspots, Magnetic disturbance, and Auroral displays

arXiv

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arXiv 2024年

作者： Hayakawa, Hisashi Cliver, Edward W. Clette, Frédéric Ebihara, Yusuke Toriumi, Shin Ermolli, Ilaria Chatzistergos, Theodosios Hattori, Kentaro Knipp, delores J. Blake, Séan P. Cauzzi, Gianna reardon, Kevin Bourdin, Philippe-A Just, dorothea Vokhmyanin, Mikhail Matsumoto, Keitaro Miyoshi, Yoshizumi ribeiro, José r. Correia, Ana P. Willis, david M. Wild, Matthew N. Silverman, Sam M. Institute for Space-Earth Environmental Research and Institute for Advanced Researches Nagoya University Nagoya4648601 Japan Science and Technology Facilities Council RAL Space Rutherford Appleton Laboratory Harwell Campus DidcotOX11 0QX United Kingdom National Solar Observatory BoulderCO80303 United States World Data Center SILSO Observatoire Royal de Belgique Brussels1180 Belgium Research Institute for Sustainable Humanosphere Kyoto University Uji6100011 Japan Unit of Synergetic Studies for Space Kyoto University Kyoto6068306 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa Sagamihara2525210 Japan INAF Osservatorio Astronomico di Roma Monte Porzio CatoneI-00078 Italy Max Planck Institute for Solar System Research GöttingenD-37077 Germany Faculty of Societal Safety Sciences Kansai University Takatsuki5691116 Japan Smead Aerospace Engineering Sciences Department 429 UCB University of Colorado Boulder BoulderCO80309 United States Heliophysics Science Division NASA Goddard Space Flight Center GreenbeltMD United States Catholic University of America WashingtonDC United States University of Graz Institute of Physics Universitätsplatz 5 Graz8010 Austria Institut für Weltraumforschung Österreichische Akademie der Wissenschaften Graz8042 Austria University of Oulu OuluFI-90014 Finland Escola Secundária Henrique Medina Esposende Av. Dr. Henrique Barros Lima Esposende4740-203 Portugal 18 Ingleside Road LexingtonMA02420 United States

We review observations of solar activity, geomagnetic variation, and auroral visibility for the extreme geomagnetic storm on 1872 February 4. The extreme storm (referred to here as the Chapman-Silverman storm) apparently originated from a complex active region of moderate area (≈ 500 μsh) that was favorably situated near disk center (S19° E05°). There is circumstantial evidence for an eruption from this region at 9-10 UT on 1872 February 3, based on the location, complexity, and evolution of the region, and on reports of prominence activations, which yields a plausible transit time of ≈29 hr to Earth. Magnetograms show that the storm began with a sudden commencement at ≈14:27 UT and allow a minimum dst estimate of £ −834 nT. Overhead aurorae were credibly reported at Jacobabad (British India) and Shanghai (China), both at 19°.9 in magnetic latitude (MLAT) and 24°.2 in invariant latitude (ILAT). Auroral visibility was reported from 13 locations with MLAT below |20|° for the 1872 storm (ranging from |10°.0|-|19°.9| MLAT) versus one each for the 1859 storm (|17°.3| MLAT) and the 1921 storm (|16.°2| MLAT). The auroral extension and conservative storm intensity indicate a magnetic storm of comparable strength to the extreme storms of 1859 September (25°.1 ± 0°.5 ILAT and −949 ± 31 nT) and 1921 May (27°.1 ILAT and −907 ± 132 nT), which places the 1872 storm among the three largest magnetic storms yet observed. © 2024, CC BY.

关键词： Geomagnetism

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downlink Channel Allocation of Visible Light Communication Network Based on Graph Coloring and Traffic Fairness

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Procedia Computer Science 2017年 107卷 667-673页

作者： Fan Yunlong Liu Jianhui Li Qing Zhang Xiaoyi National Digital Switching System Engineering & Technology R&D Center Zhengzhou 450000 China

In this paper, the allocation of downlink channel resources in the indoor visible light multi cell network is studied. Based on the three color channels of rGB-LEd, a conflict graph model is established, and a downlink channel allocation algorithm is proposed for visible light multi cell network. First, the global allocation of users’ access to the cell is given out. Then, considering the users’ business needs, a weighted conflict graph model is established, the channel allocation algorithm is proposed based on graph coloring and user traffic fairness. The simulation results show that, compared with the graph-based dynamic allocation algorithm, the proposed algorithm is to improve the downlink communication fairness of users, and the average throughput of the whole network is improved at the same time.

关键词： visible light communication downlink channel allocation graph coloring traffic fairness

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Effect of heat treatment on strain–controlled fatigue behavior of cast Mg–Nd–Zn–Zr alloy

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Journal of Materials Science & technology 2018年第11期34卷 2091-2099页

作者： Zhenming Li Qigui Wang Alan A.Luo Jichun dai Hui Zou Liming Peng Institute of Sci-technology Strategy JiangXi Academy of SciencesNanchang 330096China General Motors Company Global Propulsion SystemPontiacMI48340USA The Ohio State University ColumbusOH 43210USA Research Institute(R&D Center) Shanghai JuneBang Technology CorporationShanghai 200032China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China

The influence of heat treatment on the strain-controlled fatigue behavior of cast NZ30 K alloy was investigated. Compared with the as-cast and solutionized（T4） alloys, the peak-aged（T6） and over-aged（T7）counterparts have a higher cyclic stress and a lower plastic strain value due to the precipitation strengthening. The as-cast and T4-treated alloys have a higher fatigue strength/yield strength ratio than the aged alloys, which is mainly attributed to their higher cyclic hardening. Under stress-controlled loading,the aged alloys show lower hysteresis energies than the as-cast and T4-treated counterparts, leading to longer fatigue lifetimes. For the T4-treated alloy, the cyclic hardening and fatigue failure are controlled by the dislocations-slip and twinning, while for both the as-cast and T6-treated counterparts, they are controlled by the dislocation-slip. For the T7-treated alloy, cyclic deformation and failure behavior are mainly dependent on dislocations-slip and grain boundary sliding.

关键词： Magnesium alloys Heat treatment Strain-controlled fatigue characteristics Hysteresis energies Cyclic deformation

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research Notes: distributed Shadow for router Security defense

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International Journal of Software engineering and Knowledge engineering 2018年第2期28卷 193-206页

作者： Yufeng Li Le Tian Han Qiu Chuanhao Zhang National Digital Switching System Engineering and Technological R&D Center Zhengzhou Henan 450002 P. R. China School of Computer Engineering and Science Shanghai University Shanghai 200023 P. R. China Railway Police College Zhengzhou Henan 450000 P. R. China

router security defense technologies emerging in recent years could hardly detect and block the new booming threats with unknown signatures such as hardware Trojan, zero-day attacks, etc. We present a novel router defense technology, distributed router shadow, which builds a closed execution environment to deceive attacks entering into the router, thereby misleading the attackers into regarding it as the real attack target and executing the suspicious code to maximize the chances of detonating the system exploit; thus the original router is prevented from attacking and the suspicious code can be detected. Our experiment and analysis show that the router shadow can defend not only attacks with signature but also some new attacks without signature.

关键词： router security distributed shadow control plane pass-through protection

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Position and Velocity Estimation Using TOA and FOA Based on Lagrange Programming Neural Network

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Journal of Physics: Conference Series 2019年第1期1284卷

作者： C Jia J Yin Z Yang L Zhang National Digital Switching System Engineering and Technology Research Center Zhengzhou 450002 P.R. China Zhengzhou Information Science and Technology Institute Zhengzhou Henan 450002 P.R. China

This paper addresses the problem of estimating the position and velocity of a moving source utilizing the time-of-arrival (TOA) and frequency-of-arrival (FOA) measurements. Since the concerned estimation problem is highly non-linear and non-convex, we propose to utilize a novel neural circuit, namely the Lagrange programming neural network (LPNN) framework, to solve this problem. LPNN equips the abilities of fast convergence and the robustness of resisting high noise level, and thus these two advantages have drawn much attention for it recently. Since LPNN is able to solve the optimization problem with constraint, we first reformulate the original non-linear and non-convex maximum likelihood (ML) problem by introducing additional variables and constraints, and thus a neural network is built up based on the LPNN framework. Subsequently, the convergence and stability of the proposed neural network is mathematically proved and then verified by the results of numerical experiments. different from the conventional numerical algorithms, the analog neural network can be utilized to fulfil the task of real-time calculation, especially when there are limited computation resources in some applications. The simulation results demonstrate that the proposed LPNN model equips the basic properties of convergence and stability, and also show the superior localization accuracy of the proposed method than other numerical algorithms.

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China Communications 2016年第S1期13卷 72-86页

作者： ZHANG Guo ZHANG Jianhui WANG Binqiang ZHANG Zhen National Digital Switching System Engineering & Technological R&D Center

Towards line speed and accurateness on-line content popularity monitoring on Content Centric Networking(CCN) routers, we propose a three-stage scheme based on Bloom filters and hash tables for differentiated traffic. At the first stage, we decide whether to deliver the content to the next stage depending on traffic types. The second stage consisting of Standard Bloom filters(SBF) and Counting Bloom filters(CBF) identifies the popular content. Meanwhile, a scalable sliding time window based monitoring scheme for different traffic types is proposed to implement frequent and real-time updates by the change of popularities. Hash tables according with sliding window are used to record the popularity at the third stage. Simulation results reveal that this method reaches a 40 Gbps processing speed at lower error probability with less memory, and it is more sensitive to the change of popularity. Additionally, the architecture which can be implemented in CCN router is flexible and scalable.

关键词： CCN line speed traffic type bloom filters hash tables popularity monitoring

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Broadband,polarization-insensitive,and wide-angle microwave absorber based on resistive film

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Chinese Physics B 2016年第6期25卷 528-532页

作者：布丹丹岳春生张广求胡永涛董胜 National Digital Switching System Engineering & Technological R & D Center Zhengzhou 450002 China

A simple design of broadband metamaterial absorber（MA） based on resistive film is numerically presented in this *** unit cell of this absorber is composed of crossed rectangular rings-shaped resistive film,dielectric substrate,and continuous metal *** simulated results indicate that the absorber obtains a 12.82-GHz-wide absorption from about 4.75 GHz to 17.57 GHz with absorptivity over 90% at normal *** of surface power loss density is illustrated to understand the intrinsic absorption mechanism of the *** proposed structure can work at wide polarization angles and wide angles of incidence for both transverse electric（TE） and transverse magnetic（TM） ***,the multi-reflection interference theory is involved to analyze and explain the broadband absorption mechanism at both normal and oblique ***,the polarization-insensitive feature is also investigated by using the interference *** is seen that the simulated and calculated absorption rates agree fairly well with each other for the absorber.

关键词： broadband metamaterial absorber resistive film multi-reflection interference theory

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A Method of Multi-Antenna Signal Selection Based on SNr Estimation

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Procedia Computer Science 2017年 107卷 646-651页

作者： Xue Xiao Zhang Xiaoyi Shen Caiyao National Digital Switching System Engineering & Technique R&D Center Zhengzhou 450000 China

This paper proposes a method to select multi-antenna signals based on SNr estimation, in order to solve the negative influence of the poor partial quality branch signals in multi-antenna system. The algorithm proposes antenna selecting programs, based on the SNr estimation, the Cramer rao bound and the combined signal matched filtering, to avoid the branch poor signals and enhance the signal combine quality. Theoretical and simulation results show that the proposed algorithm has a better performance than the traditional method, and the performance of the algorithm is improved with the increase of the number of antennas and the difference of the signal quality.

关键词： Signal Selection SNr Estimation Cramer-rao Bound Multi-Antenna system

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