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Early Paleozoic granulite-facies metamorphism and anatexis in the northern West Qinling orogen： Monazite and zircon U-Pb geochronological constraints

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science China Earth sciences 2017年第5期60卷 943-957页

作者： MAO XiaoHong ZHANG JianXin YU ShengYao LI YunShuai YU XingXing LU ZengLong Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China School of Earth and Space Sciences Peking UniversityBeijing 100871China Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China Institute of Surface-Earth System Science Tianjin UniversityTianjin 300072China

In the northern West Qinling orogen(WQO), granulite-facies metamorphic rocks are recognized within the Qinling Complex. These rocks are composed of amphibole-bearing two-pyroxene granulite and garnet-sillimanite gneiss with widespread migmatitization. We investigate three granulite-facies samples and one leucosome sample from the Qinling Complex, which are suitable for U-Pb analyses of zircon and monazite. SHRIMP and LA-ICPMS U-Pb age dating of zircon and monazite from two pelitic granulites provides weighted mean ages of 430±4 Ma(MSWD=0.88) and 433±4 Ma(MSWD=0.27), *** on the petrographic characteristics and zircon CL imagery, we postulated a ca. 430 Ma metamorphic timing for the pelitic granulites. LA-ICPMS zircon U-Pb data from an amphibole two-pyroxene granulite sample reports two weighted mean age groups:424±3 Ma(MSWD=0.45) and 402±3 Ma(MSWD=1.4), which were interpreted as granulite-facies metamorphic and retrograde ages, respectively. LA-ICPMS U-Pb dating of zircons from the leucosome sample yields a weighted mean age of 426±2 Ma(MSWD=0.3), which is interpreted as the crystallization age of the leucosome. These data indicate that the West QOB experienced early Paleozoic granulite-facies metamorphism and anatexis similar to the East QOB. However, it remains unclear whether the early Paleozoic granulite facies metamorphism resulted from an arc setting created by the northward subduction of the Shangdan ocean or from a continental collisional orogenic event.

关键词： West Qinling Granulite Migmatite U-Pb age dating Metamorphism Early Paleozoic

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A fast recognition algorithm for star identification of star trackers

A fast recognition algorithm for star identification of star...

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Annual Conference of Industrial Electronics Society

作者： Xiaochu Wang Changhao Sun Ting Sun Hang Yin Fei Xing Beijing Information Science and Technology University Qian Xuesen Laboratory of Space Technology Beijing China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing China School of Photoelectronic Information and Communication Engineering Beijing Information Science and Technology University Beijing China Information Integration and Command Decision Beijing Institute of Astronautical System Engineering Beijing China Department of Precision Instruments Tsinghua University Beijing China

This paper focuses on recognizing the correct match of star identification among multiple possible candidates for star trackers. Derived from the perturbation theory, a tolerance criterion is proposed and proved to check the correctness of the candidates. A recognition algorithm is then proposed based on the tolerance criterion to select the correct match. Compared to traditional recognition algorithms, the proposed algorithm provides a straightforward and deterministic procedure and avoids non-deterministic, time-consuming, inefficient lookingup operations. Finally, simulation examples are given to show processing details and verify the proposed algorithm.

关键词： Position measurement Noise measurement Databases Silicon Sun space technology Extraterrestrial measurements

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The Lunar Gravitational-wave Antenna: Mission Studies and science Case

arXiv

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arXiv 2024年

作者： Ajith, Parameswaran Seoane, Pau Amaro Sedda, Manuel Arca Arcodia, Riccardo Badaracco, Francesca Banerjee, Biswajit Belgacem, Enis Benetti, Giovanni Benetti, Stefano Bobrick, Alexey Bonforte, Alessandro Bortolas, Elisa Braito, Valentina Branchesi, Marica Burrows, Adam Cappellaro, Enrico Della Ceca, Roberto Chakraborty, Chandrachur Subrahmanya, Shreevathsa Chalathadka Coughlin, Michael W. Covino, Stefano Derdzinski, Andrea Doshi, Aayushi Falanga, Maurizio Foffa, Stefano Franchini, Alessia Frigeri, Alessandro Futaana, Yoshifumi Gerberding, Oliver Gill, Kiranjyot Di Giovanni, Matteo Giudice, Ines Francesca Giustini, Margherita Gläser, Philipp Harms, Jan van Heijningen, Joris Iacovelli, Francesco Kavanagh, Bradley J. Kawamura, Taichi Kenath, Arun Keppler, Elisabeth-Adelheid Kobayashi, Chiaki Komatsu, Goro Korol, Valeriya Krishnendu, N.V. Kumar, Prayush Longo, Francesco Maggiore, Michele Mancarella, Michele Maselli, Andrea Mastrobuono-Battisti, Alessandra Mazzarini, Francesco Melandri, Andrea Melini, Daniele Menina, Sabrina Miniutti, Giovanni Mitra, Deeshani Morán-Fraile, Javier Mukherjee, Suvodip Muttoni, Niccolò Olivieri, Marco Onori, Francesca Papa, Maria Alessandra Patat, Ferdinando Perali, Andrea Piran, Tsvi Piranomonte, Silvia Pol, Alberto Roper Pookkillath, Masroor C. Prasad, R. Prasad, Vaishak De Rosa, Alessandra Chowdhury, Sourav Roy Serafinelli, Roberto Sesana, Alberto Severgnini, Paola Stallone, Angela Tissino, Jacopo Tkalčić, Hrvoje Tomasella, Lina Toscani, Martina Vartanyan, David Vignali, Cristian Zaccarelli, Lucia Zeoli, Morgane Zuccarello, Luciano Via Michele Iacobucci 2 L’AquilaI-67100 Italy INFN Laboratori Nazionali del Gran Sasso Via Giovanni Acitelli 22 AssergiI-67100 Italy School of Physics and Astronomy University of Minnesota 116 Church Street SE MinneapolisMN55455 United States MIT Kavli Institute for Astrophysics and Space Research 70 Vassar Street CambridgeMA02139 United States Département de Physique Théorique Université de Genève 24 quai Ansermet GenèveCH-1211 4 Switzerland Université de Genève GenevaCH-1211 Switzerland La Sapienza Università di Roma RomaI-00185 Italy INFN Sezione di Roma RomaI-00185 Italy Dipartimento di Fisica "G. Occhialini" Universitá degli Studi di Milano-Bicocca Piazza della Scienza 3 Milano20126 Italy INFN Sezione di Milano-Bicocca Piazza della Scienza 3 Milano20126 Italy Aix Marseille Univ Université de Toulon CNRS CPT Marseille France CSIC-INTA ESAC campus Camino Bajo del Castillo s/n Villanueva de la Cañada28692 Spain Dipartimento di Fisica Università di Genova GenovaI-16146 Italy INFN Sez. di Genova GenovaI-16146 Italy INAF - Osservatorio Astronomico d’Abruzzo Via Mentore Maggini s.n.c. TeramoI-64100 Italy INAF - Osservatorio Astronomico di Roma via Frascati 33 Monte Porzio Catone RomaI-00078 Italy Istituto Nazionale di Geofisica e Vulcanologia Sezione di Bologna viale Berti Pichat 6-2 BolognaI-40127 Italy Dipartimento di Fisica Università degli Studi di Trieste via Valerio 2 Trieste34127 Italy INFN Sezione di Trieste via Valerio 2 Trieste34127 Italy UCLouvain Louvain-la-NeuveB-1348 Belgium Precision Mechatronics Laboratory ULiège A&M Dept. Allée de la Découverte 9 B52/Quartier Polytec 1 LiègeB-4000 Belgium Department of Physics and Electronics Christ University Hosur Road Bangalore560029 India INAF - Osservatorio Astronomico di Brera via Brera 28 MilanoI-20121 Italy Av. de Los Castros s/n Santander39005 Spain Dipartimento di Fisica e Astronomia "Augusto Righi" Alma Mater Studiorum Università degli

The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response of the Moon to gravitational waves (GWs). Given the size of the Moon and the expected noise produced by the lunar seismic background, the LGWA would be able to observe GWs from about 1 mHz to 1 Hz. This would make the LGWA the missing link between space-borne detectors like LISA with peak sensitivities around a few millihertz and proposed future terrestrial detectors like Einstein Telescope or Cosmic Explorer. In this article, we provide a first comprehensive analysis of the LGWA science case including its multi-messenger aspects and lunar science with LGWA data. We also describe the scientific analyses of the Moon required to plan the LGWA mission. © 2024, CC BY.

关键词： Gravity waves

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Semileptonic B and Bsdecays involving scalar and axial-vector mesons

arXiv

引用

arXiv 2018年

作者： Kang, Xian-Wei Luo, Tao Zhang, Yi Dai, Ling-Yun Wang, Chao College of Nuclear Science and Technology Beijing Normal University Beijing100875 China Institute of Modern Physics Fudan University Shanghai200443 China School of Physics and Electronics Hunan University Changsha410082 China Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Center for Ecological and Environmental Sciences Key Laboratory for Space Bioscience and Biotechnology Northwestern Polytechnical University Xi'an710072 China

We report our theoretical calculations on the branching fractions for the semileptonic B and Bsdecays based on the form factors in the covariant light-front quark model. That is, B(Bs) → (P, V, S, A)lνl, where P and V denote the pseudoscalar and vector mesons, respectively, while S denotes the scalar meson with mass above 1 GeV and A the axial-vector meson. The branching fractions for the semileptonic B → P and V modes have been measured very well in experiment and our theoretical values are in good agreement with them. The ones for B → S and A modes are our theoretical predictions. There is little experimental information on the semileptonic Bsdecays although much theoretical effort has been done. In addition, we predict the branching fractions of B → D∗0(2400)lνland Bs→ D∗-s0(2317)lνlas (2.31 ± 0.25) × 10-3and (3.07 ± 0.34) × 10-3, in order, assuming them as the conventional mesons with quark-antiquark configuration. The high luminosity e+e--collider SuperKEKB/Belle-II is running, with the data sample enhanced by a factor of 40 compared to Belle, which will provide huge opportunity for the test of the theoretical predictions and further help understand the inner structure of these scalar and axial-vector mesons, e.g., the glueball content of f0(1710) and the mixing angles for the axial-vector mesons. These decay channels can also be accessed by the LHCb experiment. Copyright © 2018, The Authors. All rights reserved.

关键词： Forecasting

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The Marine Biodiversity Observation Network Plankton Workshops: Plankton Ecosystem Function, Biodiversity, and Forecasting—Research Requirements and Applications

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Limnology and Oceanography Bulletin 2022年第1期31卷

作者： Maria Grigoratou Enrique Montes Anthony J. Richardson Jason D. Everett Esteban Acevedo-Trejos Clarissa Anderson Bingzhang Chen Tamar Guy-Haim Jana Hinners Christian Lindemann Tatiane Martins Garcia Klas O. Möller Fanny M. Monteiro Aimee R. Neeley Todd D. O'Brien Artur P. Palacz Alex J. Poulton A. E. Friederike Prowe Áurea E. Rodríguez-Santiago Cécile S. Rousseaux Jeffrey Runge Juan F. Saad Ioulia Santi Rowena Stern Alice Soccodato Selina Våge Meike Vogt Soultana Zervoudaki Frank E. Muller-Karger Gulf of Maine Research Institute Portland ME USA Ocean Chemistry & Ecosystems Division Atlantic Oceanographic and Meteorological Laboratory National Oceanic and Atmospheric Administration Miami FL USA School of Mathematics and Physics University of Queensland Brisbane QLD Australia CSIRO Oceans and Atmosphere Queensland Biosciences Precinct St. Lucia QLD Australia Centre for Marine Science and Innovation School of Biological Earth and Environmental Sciences University of New South Wales Sydney NSW Australia Earth Surface Process Modelling German Research Centre for Geosciences (GFZ) Potsdam Germany Scripps Institution of Oceanography La Jolla CA USA Department of Mathematics and Statistics University of Strathclyde Glasgow UK Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) The Hong Kong University of Science and Technology Clear Water Bay Hong Kong China National Institute of Oceanography Israel Oceanographic and Limnological Research Haifa Israel Helmholtz-Zentrum Hereon Geesthacht Germany Department of Biological Sciences University of Bergen Bergen Norway Instituto de Ciências do Mar (LABOMAR) Universidade Federal do Ceará (UFC) Fortaleza Brazil Department Biological Carbon Pump Helmholtz-Zentrum Hereon Institute of Carbon Cycles Geesthacht Germany Bristol Research Initiative for the Dynamic Global Environment (BRIDGE) School of Geographical Sciences University of Bristol Bristol UK NASA Goddard Space Flight Center/Science Systems and Applications Inc Greenbelt MD USA NOAA Fisheries Silver Spring MD USA International Ocean Carbon Coordination Project Institute of Oceanology Polish Academy of Sciences Sopot Poland Lyell Centre for Earth and Marine Science Heriot-Watt University Edinburgh UK GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany Caribbean Coastal Ocean Observing System (CARICOOS) University of Puerto Rico-Mayaguez Mayagüez PR USA Taller Ecológico de Puerto Rico Boquerón P

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An environment for sustainable research software in Germany and beyond: Current state, open challenges, and call for action

arXiv

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arXiv 2020年

作者： Anzt, Hartwig Bach, Felix Druskat, Stephan Löffler, Frank Loewe, Axel Renard, Bernhard Y. Seemann, Gunnar Struck, Alexander Achhammer, Elke Aggarwal, Piush Appel, Franziska Bader, Michael Brusch, Lutz Busse, Christian Chourdakis, Gerasimos Dabrowski, Piotr W. Ebert, Peter Flemisch, Bernd Friedl, Sven Fritzsch, Bernadette Funk, Maximilian D. Gast, Volker Goth, Florian Grad, Jean-Noël Hermann, Sibylle Hohmann, Florian Janosch, Stephan Kutra, Dominik Linxweiler, Jan Muth, Thilo Peters-Kottig, Wolfgang Rack, Fabian Raters, Fabian H.C. Rave, Stephan Reina, Guido Reißig, Malte Ropinski, Timo Schaarschmidt, Joerg Seibold, Heidi Thiele, Jan P. Uekerman, Benjamin Unger, Stefan Weeber, Rudolf Germany Innovative Computing Lab University of Tennessee KnoxvilleTN United States Department of English Studies Friedrich Schiller University Jena Germany Germany Department of Computer Science Humboldt-Universität zu Berlin Germany Heinz Nixdorf Chair for Distributed Information Systems Friedrich Schiller University Jena Germany Michael Stifel Center Jena Germany Center for Computation and Technology Louisiana State University Baton Rouge United States Germany Robert Koch Institute Berlin Germany Hasso Plattner Institute Faculty of Digital Engineering University of Potsdam Germany Institute for Experimental Cardiovascular Medicine University Heart Centre Freiburg Bad Krozingen Germany Faculty of Medicine University of Freiburg Freiburg Germany Matters of Activity. Image Space Material. Cluster of Excellence at Humboldt-Universität zu Berlin Germany Technische Universität München Germany Language Technology Lab Universität Duisburg-Essen Germany Germany Department of Informatics Technical University of Munich Germany Technische Universität Dresden Germany Deutsches Krebsforschungszentrum Heidelberg Germany Scientific Computing in Computer Science Technical University Munich Germany School of Computing Communication and Business Hochschule für Technik und Wirtschaft Berlin Germany Center for Bioinformatics Saar Saarland Informatics Campus Germany Institute for Modelling Hydraulic and Environmental Systems University of Stuttgart Germany Berlin Institute of Health Germany Scientific Computing Alfred Wegener Institute Helmholtz Center for Polar and Marine Research Bremerhaven Germany Max-Planck-Gesellschaft e.V. Institut für Theoretische Physik und Astrophysik Universität Würzburg Germany Institut für Computerphysik University of Stuttgart Germany University Library University of Stuttgart Germany Universität Bremen Germany Max Planck Institute of Molecular Cell Biology and Genetics Dresden Germany European Molecular Biology Laboratory Heidelb

Research software has become a central asset in academic research. It optimizes existing and enables new research methods, implements and embeds research knowledge, and constitutes an essential research product in itself. Research software must be sustainable in order to understand, replicate, reproduce, and build upon existing research or conduct new research effectively. In other words, software must be available, discoverable, usable, and adaptable to new needs, both now and in the future. Research software therefore requires an environment that supports sustainability. Hence, a change is needed in the way research software development and maintenance are currently motivated, incentivized, funded, structurally and infrastructurally supported, and legally treated. Failing to do so will threaten the quality and validity of research. In this paper, we identify challenges for research software sustainability in Germany and beyond, in terms of motivation, selection, research software engineering personnel, funding, infrastructure, and legal aspects. Besides researchers, we specifically address political and academic decision-makers to increase awareness of the importance and needs of sustainable research software practices. In particular, we recommend strategies and measures to create an environment for sustainable research software, with the ultimate goal to ensure that software-driven research is valid, reproducible and sustainable, and that software is recognized as a first class citizen in research. This paper is the outcome of two workshops run in Germany in 2019, at deRSE19 - the first International Conference of Research Software Engineers in Germany - and a dedicated DFG-supported follow-up workshop in Berlin. Copyright © 2020, The Authors. All rights reserved.

关键词： Software design

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An emission spectrum for WASP-121b measured across the 0.8-1.1 µm wavelength range using the Hubble space Telescope

arXiv

引用

arXiv 2019年

作者： Mikal-Evans, Thomas Sing, David K. Goyal, Jayesh M. Drummond, Benjamin Carter, Aarynn L. Henry, Gregory W. Wakeford, Hannah R. Lewis, Nikole K. Marley, Mark S. Tremblin, Pascal Nikolov, Nikolay Kataria, Tiffany Deming, Drake Ballester, Gilda E. Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Earth and Planetary Sciences Johns Hopkins University BaltimoreMD United States Department of Physics & Astronomy Johns Hopkins University BaltimoreMD United States Physics and Astronomy Stocker Road University of Exeter ExeterEX4 3RF United Kingdom Center of Excellence in Information Systems Tennessee State University NashvilleTN37209 United States Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Department of Astronomy and Carl Sagan Institute Cornell University 122 Sciences Drive IthacaNY14853 United States NASA Ames Research Center Moffett FieldCA United States Maison de la Simulation CEA CNRS Univ Paris-Sud UVSQ Université Paris-Saclay Gif-sur-YvetteF-91191 France NASA Jet Propulsion Laboratory 4800 Oak Grove Drive PasadenaCA91109 United States Department of Astronomy University of Maryland at College Park College ParkMD20742 United States Lunar and Planetary Laboratory University of Arizona TucsonAZ85721 United States

WASP-121b is a transiting gas giant exoplanet orbiting close to its Roche limit, with an inflated radius nearly double that of Jupiter and a dayside temperature comparable to a late M dwarf photosphere. Secondary eclipse observations covering the 1.1-1.6 µm wavelength range have revealed an atmospheric thermal inversion on the dayside hemisphere, likely caused by high altitude absorption at optical wavelengths. Here we present secondary eclipse observations made with the Hubble space Telescope Wide Field Camera 3 spectrograph that extend the wavelength coverage from 1.1 µm down to 0.8 µm. To determine the atmospheric properties from the measured eclipse spectrum, we performed a retrieval analysis assuming chemical equilibrium, with the effects of thermal dissociation and ionization included. Our best-fit model provides a good fit to the data with reduced χν2 = 1.04. The data diverge from a blackbody spectrum and instead exhibit emission due to H− shortward of 1.1 µm. The best-fit model does not reproduce a previously reported bump in the spectrum at 1.25µm, possibly indicating this feature is a statistical fluctuation in the data rather than a VO emission band as had been tentatively suggested. We estimate an atmospheric metallicity of [M/H] = 1.09+0.58/-0.69, and fit for the carbon and oxygen abundances separately, obtaining [C/H] = −0.29+0.61/-0.48 and [O/H] = 0.18+0.64/-0.60. The corresponding carbon-to-oxygen ratio is C/O = 0.49+0.65/-0.37, which encompasses the solar value of 0.54, but has a large uncertainty. Copyright © 2019, The Authors. All rights reserved.

关键词： Carbon

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Gauss Genesis of asteroids and evolution of the solar system: A sample return mission to ceres

arXiv

引用

arXiv 2019年

作者： Shi, Xian Castillo-Rogez, Julie Hsieh, Henry Hui, Hejiu Ip, Wing-Huen Lei, Hanlun Li, Jian-Yang Tosi, Federico Zhou, Liyong Agarwal, Jessica Barucci, Antonella Beck, Pierre Bagatin, Adriano Campo Capaccioni, Fabrizio Coates, Andrew Cremonese, Gabriele Duffard, Rene Jaumann, Ralf Jones, Geraint Grande, Manuel Kallio, Esa Lin, Yangting Mousis, Olivier Nathues, Andreas Oberst, Jurgen Sierks, Holger Ulamec, Stephan Wang, Mingyuan Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3 Göttingen37077 Germany NASA Jet Propulsion Laboratory 4800 Oak Grove Dr PasadenaCA91109 United States Planetary Research Institute TucsonAZ85719 United States School of Earth Sciences and Engineering Nanjing University 163 Xianlin Avenue Nanjing210023 China Space Science Institute Macau University of Science and Technology Av. Wai Long Macau China School of Astronomy and Space Science Nanjing University 163 Xianlin Avenue Nanjing210023 China Planetary Research Institute TucsonAZ85719 United States INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali Via del Fosso del Cavaliere 100 Rome00133 Italy School of Astronomy and Space Science Nanjing University 163 Xianlin Avenue Nanjing210023 China Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3 Göttingen37077 Germany LESIA Observatoire de Paris CNRS UPMC Univ. Paris 06 Univ. Paris-Diderot 5 Place J. Janssen Meudon Principal Cedex92195 France Univ. Grenoble Alpes CNRS Centre National de la Recherche Scientifique IPAG Grenoble France Departamento de Física Ingenieriá de Sistemas y Teoriá de la Senãl P.O. Box 99 Alicante03080 Spain INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali Via del Fosso del Cavaliere 100 Rome00133 Italy Mullard Space Science Laboratory University College London Holmbury St Mary Dorking SurreyRH56NT United Kingdom INAF-Osservatorio Astronomico di Padova Vicolo dell'Osservatorio 5 Padova35122 Italy Glorieta de la Astronomiá S/N Granada18008 Spain DLR Institute of Planetary Research Rutherfordstraße 2 Berlin12489 Germany University of Aberystwyth Penglais AberystwythSY233FL United Kingdom School of Electrical Engineering Aalto University Maarinkatu 8 P.O. Box 15500 AaltoFI-00760 Finland Institute of Geology and Geophysics Chinese Academy of Sciences 19 Beitucheng W Rd Chaoyang Qu Beijing100029 China UMR 7326 MarseilleF-13388 France Adam S

The goal of Project GAUSS is to return samples from the dwarf planet Ceres. Ceres is the most accessible ocean world candidate and the largest reservoir of water in the inner solar system. It shows active cryovolcanism and hydrothermal activities in recent history that resulted in minerals not found in any other planets to date except for Earth-fs upper crust. The possible occurrence of recent subsurface ocean on Ceres and the complex geochemistry suggest possible past habitability and even the potential for ongoing habitability. Aiming to answer a broad spectrum of questions about the origin and evolution of Ceres and its potential habitability, GAUSS will return samples from this possible ocean world for the first time. The project will address the following top-level scientific questions: -œ What is the origin of Ceres and the origin and transfer of water and other volatiles in the inner solar system? -œ What are the physical properties and internal structure of Ceres? What do they tell us about the evolutionary and aqueous alteration history of icy dwarf planets? -œ What are the astrobiological implications of Ceres? Was it habitable in the past and is it still today? -œ What are the mineralogical connections between Ceres and our current collections of primitive meteorites? GAUSS will first perform a high-resolution global remote sensing investigation, characterizing the geophysical and geochemical properties of Ceres. Candidate sampling sites will then be identified, and observation campaigns will be run for an in-depth assessment of the candidate sites. Once the sampling site is selected, a lander will be deployed on the surface to collect samples and return them to Earth in cryogenic conditions that preserves the volatile and organic composition as well as the original physical status as much as possible. Copyright © 2019, The Authors. All rights reserved.

关键词： Gaussian distribution

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Research on starlight hardware-in-the-loop simulator

Research on starlight hardware-in-the-loop simulator

引用

International Symposium on Optoelectronic technology and Application 2016(OTA 2016)——Conf.5 Optical Measurement technology and Instrument

作者： ZHANG Ying GAO Yang LIU Dongfang DU Huijie LEI Jie Science and Technology on Special System Simulation Laboratory Beijing Simulation Center

The starlight navigation is considered one of the most essential methods for spacecraft *** simulation system is a high-precision system with large fields of view and is designed to t

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Exploring the Foundations of the Physical Universe with space Tests of the Equivalence Principle

arXiv

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arXiv 2019年

作者： Wolf, Peter Blanchet, Luc Bongs, Kai Bouyer, Philippe Battelier, B. Bertoldi, A. Braxmaier, Claus Wörner, L. Calonico, Davide Fayet, Pierre Hees, Aurélien Le Poncin-Lafitte, C. Tuckey, P. Jetzer, Philippe Lämmerzahl, Claus Lecomte, Steve Métris, Gilles Rasel, Ernst Gaaloul, N. Loriani, S. Schubert, C. Reynaud, Serge Guerlin, C. Salomon, C. Rodrigues, Manuel Bergé, J. Rothacher, Markus Schleich, Wolfgang P. Roura, A. Schiller, Stephan Sopuerta, Carlos Nofrarias, M. Sorrentino, Fiodor Sumner, Tim J. Tino, Guglielmo M. von Klitzing, Wolf Zelan, Martin SYRTE Observatoire de Paris Université PSL CNRS Sorbonne Université LNE 61 avenue de l'Observatoire Paris75014 France GRECO Institut dAstrophysique de Paris CNRS Sorbonne Université France School of Physics and Astronomy University of Birmingham United Kingdom LP2N IOGS CNRS Université de Bordeaux Institut dOptique France DLR Institute of Space Systems System Enabling Technologies Universität Bremen ZARM Center of Applied Space Technology and Microgravity Germany Italy LPTENS Ecole normale supérieure PSL CNRS Sorbonne Université Université de Paris France SYRTE Observatoire de Paris Université PSL CNRS Sorbonne Université LNE France Physik Institut Universität Zürich Switzerland Universität Bremen ZARM Center of Applied Space Technology and Microgravity Germany Switzerland Université Côte dAzur Observatoire de la Côte dAzur CNRS IRD Géoazur France Leibniz Universität Hannover Germany Laboratoire Kastler Brossel CNRS Sorbonne Université ENS-PSL Université Collège de France France Dpartement de Mesures Physiques ONERA France Institute of Geodesy and Photogrammetry ETH Zürich Switzerland Institut für Quantenphysik Universität Ulm Germany Institut für Experimentalphysik Heinrich-Heine-Universität Düsseldorf Germany Spain Istituto Nazionale di Fisica Nucleare INFN - sez. di Genova Italy High Energy Physics Group Imperial College London Blackett Laboratory United Kingdom Dipartimento di Fisica e Astronomia LENS Laboratory Università degli Studi di Firenze INFN - Sez. di Firenze Italy Inst. of Electronic Structure and Laser Foundation for Research and Technology Hellas Greece Measurement Science and Technology RISE Research Institutes of Sweden Sweden

Einstein's theory of general relativity (GR) is a cornerstone of our current description of the physical world. It is used to understand the flow of time in presence of gravity, the motion of bodies from satellites to galaxy clusters, the propagation of electromagnetic waves in the presence of massive bodies, the generation and propagation of gravitational waves, the evolution of stars, and of the Universe as a whole. But there is a strong asymmetry between GR and the other interactions of the standard model of particle physics (SM): the electromagnetic, weak, and strong interactions. Whilst the latter couple to some specific property or charge, gravitation is universally coupled, meaning that it couples in the same way to any mass/energy, which allows a geometric description of gravitation as the effect of the curvature of space-time. The phenomenological manifestation of this universal coupling is known as the Einstein Equivalence Principle (EEP), and is central to modern physics at all scales. The EEP is not a fundamental symmetry, like e.g. gauge invariance in the SM, but rather an experimental fact. Einstein himself initially called it the hypothesis of equivalence before elevating it to a principle once it became clear how central it was in the generalization of special relativity to include gravitation. And indeed, from a SM perspective it is rather surprising that the EEP should be satisfied at all, let alone at the stringent uncertainties of present-day tests. Furthermore, the difficulties in quantizing GR and in unifying it with the SM gives further indications that the EEP must be violated at some level. For example, most attempts at unification theories involve additional fields, that have no good reason to couple universally to the SM and thus would violate the EEP. Similarly, the unknown nature of dark energy and dark matter postulated by modern cosmology and astronomy, is often "explained" by invoking additional fields that permeate space-time. Again

关键词： Relativity

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