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Fluid Flow Estimation with Multiscale Ensemble Filters Based on Motion Measurements Under Location Uncertainty

Numerical Mathematics(Theory,Methods and Applications) 2013年第1期6卷 21-46页

作者： Sébastien Beyou Thomas Corpetti Sai Gorthi Etienne Mémin INRIA/FLUMINANCE 35042 Rennes CedexFrance cnrs/letg-rennes-costel Campus Villejean Place du recteur Henri Le Moal CS *** Rennes cedexFrance Indian Institute of Space Science and Technology Valiamala P.O.Thiruvananthapuram–695547Kerala India

This paper proposes a novel multi-scale fluid flow data assimilation approach,which integrates and complements the advantages of a Bayesian sequential assimilationtechnique, the Weighted Ensemble Kalman filter (WEnKF) [27]. The data assimilation proposed in this work incorporates measurement brought by an efficient multiscalestochastic formulation of the well-known Lucas-Kanade (LK) estimator. This estimatorhas the great advantage to provide uncertainties associated to the motion measurements at different scales. The proposed assimilation scheme benefits from this multiscale uncertainty information and enables to enforce a physically plausible dynamicalconsistency of the estimated motion fields along the image sequence. Experimentalevaluations are presented on synthetic and real fluid flow sequences.

关键词： Data assimilation stochastic filter particle filters fluid motion estimation

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Robustness of chiral symmetry in atomic nuclei with reflectionasymmetric shapes

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Science Bulletin 2020年第23期65卷 1956-1957页

作者： costel Marian Petrache IJCLab CNRS/IN2P3Univ Paris-SaclayF-91405 OrsoyFrance

Nearly degenerate quantum states arise from fundamental symmetries, which are often broken in finite many-body systems like atomic nuclei. Chirality can be static, like in molecules composed of more than four atoms, or dynamic, like in particle physics distinguishing between parallel and antiparallel orientation of the spin with respect to the momentum of massless fermions.

关键词：手征对称性 momentum degenerate

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Alignment of Vertically Grown Carbon Nanostructures Studied by X-Ray Absorption Spectroscopy

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Materials Sciences and Applications 2014年第13期5卷 966-983页

作者： Jeannot Mane Mane Francois Le Normand Rolant Eba Medjo costel Sorin Cojocaru Ovidiu Ersen Antoine Senger Carine Laffon Bridinette Thiodjio Sendja César Mbane Biouele Germain Hubert Ben-Bolie Pierre Owono Ateba Philippe Parent IPCMS UMR 7504 CNRSStrasbourgFrance Ecole Nationale Supérieure Polytechnique(National Advanced School of Engineering) Department of Mathematics and Physical SciencesThe University of YaoundéIYaoundeCameroon Physics Department Faculty of ScienceUniversity of YaoundéIYaoundeCameroon Physics Department Faculty of ScienceUniversity of DoualaDoualaCameroon LURE UMR CNRSCentre Universitaire Paris SudOrsayFrance

X-Ray Absorption Spectroscopy (XAS) on the carbon K edge of carbon nanostructures (nanotubes, nanofibers, nanowalls) is reported here. They are grown on plain SiO2 (8 nm thick)/Si(100) substrates by a Plasma and Hot Filaments-enhanced Catalytic Chemical Vapor Deposition (PE HF CCVD) process. The morphology and the nature of these carbon nanostructures are characterized by SEM, TEM and Raman spectroscopy. According to conditions of catalyst preparation and DC HF CCVD process, carbon nanotubes (CNTs), carbon nanofibers (CNFs), carbon nanowalls (CNWs), carbon nanoparticles (CNPs) with different orientation of the graphene plans or shells can be prepared. From the angular dependence of the incident light and geometrical morphology of the nanostructures, wide variations of the C K-edge intensity of the transitions to the empty π* and σ* states occur. A full lineshape analysis of the XAS spectra has been carried out using a home-made software, allowing estimating the relative proportion of π* and σ* transitions. A geometrical model of the angular dependence with the incidence angle of the light and the morphology of the carbon nanostructures is derived. With normalization to the HOPG (Highly Oriented Pyrolytic Graphite graphite) reference case, a degree of alignment can be extracted which is representative of the localized orientation of the graphitic carbon π bonds, accounting not only for the overall orientation, but also for local defects like impurities incorporation, structural defects ... This degree of alignment shows good agreement with SEM observations. Thus CNTs films display degrees of alignment around 50%, depending on the occurrence of defects in the course of the growth, whereas no special alignment can be detected with CNFs and CNPs, and a weak one (about 20%) is detected on CNWs.

关键词： X-Ray Absorption Spectroscopy Carbon Nanostructures(CNTs,CNFs,CNWs,CNPs) Plasma-and Hot Filaments-Enhanced Catalytic Chemical Vapor Deposition Geometrical Model Angular Dependence

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Candidate Revolving Chiral Doublet Bands in^(119)Cs

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IMP & HIRFL Annual Report 2022年第1期 32-33页

作者： Zheng Kuankuan costel Petrache Zhang Zhenhua Alain Astier Lv Bingfeng Paul Greenlees Tuomas Grahn Rauno Julin Sanna Juutinen Minna Luoma Jari Ojala Janne Pakarinen Juho Partanen Paavo Rahkila Panu Ruotsalainen Mikael Sandzelius Jan Saren Holly Tann Juha Uusitalo George Zimba Bo Cederwall Ozge Aktas Aysegul Ertoprak Zhang Wei Guo Song Liu Minliang Zhou Xiaohong Istvan Kuti B.M.Nyako D.Sohler J.Timar Corina Andreoiu Maria Doncel David Joss Robert Page Universite Paris-Saclay CNRS/IN2P3IJCLab91405 OrsayFrance Institute of Modern Physics Chinese Academy of SciencesLanzhou 730070China Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China University of Jyvaskyla Department of PhysicsP.O.Box 35FI-40014University of JyvaskylaFinland Oliver Lodge Laboratory Department of PhysicsUniversity of LiverpoolLiverpool L697ZEUnited Kingdom KTH Department of Physics S-10691 StockholmSweden Institute for Nuclear Research(Atomki-ELKH) 4001 DebrecenHungary Department of Chemistry Simon Fraser UniversityBurnabyBC V5A 1S6Canada

The chiral bands built on a con guration with only protons in the transient backbending regime was also observed for the rst time in^(119)Cs^([1]).One newly observed band(Band 9)which is nearly degenerate to the strongly-coupled g9=2[404]9=2^(+)band of 119Cs was identi *** exhibits a backbending similar to that of known band(Band 8),at nearly constant rotation frequency.

关键词： bending rotation degenerate

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