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Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter records after the December 26, 2004 Sumatra earthquake

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Science China Earth Sciences 2006年第12期49卷 1259-1269页

作者： Jacques Hinderer Institut de Physique du Globe de strasbourg (UMR 7516 CNRS-ULP) 5 rue Descartes 67084 Strasbourg Cedex France

New generation superconducting gravimeters (SGs), which have been demonstrated to be better than the best seismometers STS-1 at frequencies below 1 mHz, can be accepted as the quietest vertical seismometers for observation of long-period earth free oscillations. Wavelet filtering with narrow band-pass frequency response as shown in this paper is very helpful in removing at- mospheric pressure effects from on gravity records in long-period seismic mode frequency bands. The processing of high quality SG records after the great Sumatra earthquake (Dec. 26, 2004) with wavelet filtering leads to clear observations of all coupled toroidal modes below 1.5 mHz except these for 0T5, 0T7 and 1T1; moreover 1T2 and 1T3 are, for the first time, unambiguously revealed in the vertical components of the free oscillations. The three well-resolved splitting singlets of overtones 2S1 are observed from a single SG record for the first time.

关键词： superconducting gravimeter,Sumatra earthquake,wavelet filter,Earth free oscillations,pressure correction.

On the Chow Groups of Certain Cubic Fourfolds

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Acta Mathematica Sinica,English Series 2017年第7期33卷 887-898页

作者： Robert LATERVEER Institut de Recherche Mathématique Avancée CNRS-Universitd de Strasbourg7 Rue Rene Descartes67084 Strasbourg CedexFrance

This note is about the Chow groups of a certain family of smooth cubic fourfolds. This family is characterized by the property that each cubic fourfold X in the family has an involution such that the induced involution on the Fano variety F of lines in X is symplectic and has a K3 surface S in the fixed locus. The main result establishes a relation between X and S on the level of Chow motives. As a consequence, we can prove finite-dimensionality of the motive of certain members of the family. Keywords Algebraic cycles, Chow groups, motives, cubic fourfolds, hyperkiihler varieties, K3 sur- faces, finite-dimensional motive

关键词： Algebraic cycles Chow groups motives cubic fourfolds hyperk?hler varieties K3 surfaces finite-dimensional motive

Numerical Solution of the Gyroaverage Operator for the Finite Gyroradius Guiding-Center Model

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Communications in Computational Physics 2010年第8期8卷 484-510页

作者： Nicolas Crouseilles Michel Mehrenberger Hocine Sellama INRIA Nancy Grand-Est and IRMA 7rue Rene Descartes67084 StrasbourgFrance

In this work,we are concerned with numerical approximation of the gyroaverage operators arising in plasma physics to take into account the effects of the finite Larmor radius *** methods are proposed in the space configuration and compared to the reference spectral *** then investigate the influence of the different approximations considering the coupling with some guiding-center models available in the literature.

关键词： Gyroaverage operator cubic splines Bessel function plasma simulation guidingcenter model Eulerian solvers for Vlasov

Dynamic Regulation of DELLA Protein Activity： SPINDLY and SECRET AGENT Unmasked!

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Molecular Plant 2017年第6期10卷 785-787页

作者： Lucie Camut Jean-Michel Daviere Patrick Achard Institut de biologie moleculaire des plantes CNRS Universite de Strasbourg 12 rue du General Zimmer 67084 Strasbourg Cedex France

Plants are sessile organisms that integrate growth responses to multiple endogenous and environmental signals. The DELLA family of transcription regulators, first identified as key repressors of gibberellin （GA） signaling, have emerged as a central node of integration, thus providing a mechanism for environmentally responsive growth regulation （Oh et al., 2014）.

关键词： Dynamic Regulation DELLA Protein Activity SECRET AGENT Unmasked

Comprehensive comparison and analysis of the tidal gravity observations obtained with superconducting gravimeters at stations in China,Belgium and France

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Chinese Science Bulletin 1999年第8期44卷 750-755页

作者： Ducarme B Hinderer J Royal Observatory of Belgium B-1180 Brussels BelgiumSchool and Observatory of the Physics of the Earth 67084 Strasbourg France

The long-term tidal gravity observations of about 27 a obtained with superconducting gravimeters (SG) at stations in Wuhan (China), Brussels (Belgium) and strasbourg (France) are analyzed comprehensively. The quality factors of these observations at various stations are obtained and the tidal parameters are determined accurately. The efficiency when using various procedures on improving accuracy of the tidal parameters is discussed. The loading corrections on tidal parameters are carried out based on the global ocean tidal models. The correlations between the observed residuals and air pressure change are studied, the atmospheric gravity admittances in both temporal and frequency domains are determined, and the possible reasons of inducing the discrepancy between the observed tidal parameters and those in the standard tidal models are studied.

关键词： tidal gravity superconducting gravimeter. comprehensive comparison accuracy analysis.

Solution Structure of SECIS, the mRNA Element Required for Eukaryotic Selenocysteine Insertion──Interaction Studies Withthe SECIS-Binding Protein SBP

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Biomedical and Environmental Sciences 1997年第2期10卷 177-181页

作者： ROBERT WALCZAK NADIA HUBERT PHILIPPE CARBON, AND ALAIN KROL(UPR 9002 du CANS"Structure des MAcromolecules Biologiques et Mecanismes de Reconnaissance", IBMC, 15, Rue Rene Descartes, 67084 strasbourg Cedex, France) INST BIOL MOL & CELLULAIRE UPR 9002 CNRSF-67084 STRASBOURGFRANCE

Selenocysteine, a selenium-containing analog of cysteine, is found in the prokaryotic and eukaryotic kingdoms in active sites of enzymes involved in oxidation-reduction reactions. This aminoacid is cotranslationally incorporated at UGA codons which usually act as translation stop codons. In eukaryotes, decoding of selenocysteine necessitates the participation of the selenocysteine insertion sequence (SECIS), an element lying in the 3' -untranslated region of selenoprotein mRNAs. A detailed experimental study of the secondary structures of the SECIS elements of rat and human type 1 iodothyronine deiodinases and rat glutathione peroxidase was performed. Enzymatic and chemical structure probing led us to propose a secondary structure model, supported by sequence comparison of 23 SECIS mRNAs. The secondary structure model revealed the existence of a novel type of RNA motif composed of four consecutive non-Watson-Crick base-pairs. Using gel shift experiments, we identified in several mammalian cell type extracts the protein SBP,for SECIS-binding protein, that specifically recognizes the iodothyronine deiodinases and glutathione peroxidase SECIS elements. The structural model that we derived for the SECIS RNAs discloses RNA features possibly implicated in the binding of SBP and/or SECIS function

关键词： mRNA the mRNA Element Required for Eukaryotic Selenocysteine Insertion UGA Solution Structure of SECIS Interaction Studies Withthe SECIS-Binding Protein SBP

Numerical study of the performance of multistage Scaba 6SRGT impellers for the agitation of yield stress fluids in cylindrical tanks

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Journal of Hydrodynamics 2015年第3期27卷 436-442页

作者： AMEUR Houari BOUZIT Mohamed GHENAIM Abdellah Laboratoire de Mécanique Appliquée Faculté de Génie MécaniqueUSTO-MB Institut de Technologie Université Ibn Khaldoun INSA de strasbourg-24 Bd de la Victoire-67084 strasbourg-France

The 3-D flow fields and power consumption in a vessel stirred by multistage Scaba 6SRGT impeller have been investiga- ted. The Xanthan gum solutions in water were used, which have a shear thinning behavior with yield stress. This study was carried out with the help of a CFD package （CFX 13.0, Ansys Inc.） which is based on the finite volume method to solve the momentum equations. The effects of stirring rate, fluid rheology, impeller number, impeller location and vessel size on the performance of such stirred system are presented. To validate the CFD model, our predicted results have been compared with other literature data and a satisfactory agreement has been found.

关键词： Scaba 6SRGT impeller multistage agitator yield stress fluid stirred tank power consumption

Tomographic study of the deep tectonics in the Yecheng-Shiquanhe area of the Tibetan Plateau

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Science China Earth Sciences 2005年第4期48卷 477-483页

作者： G. Wittlinger G. Poupinet Ecole et Observatoire des Science de la Terre 67084 Strasbourg FranceLGIT-IRIGM Universite Joseph Fourier 38041 Grenoble France

The Yecheng-Shiquanhe profile runs over the western Tibetan Plateau from the south margin of the Tarim Basin, crossing the west Kunlun orogeny, to the east of Karakorum. The authors applied body waves to 3-dimensional inversion of travel time residuals and outlined the deep tectonic pattern of the northwestern Tibetan Plateau. An image was obtained, showing that the Tarim lithosphere is subducted southwards underneath the west Kunlun orogeny at an angle of 40° and a depth of 280 km. Surface structures are well expressed in the image and can be further traced in deeper levels. The prominent finding is that the Gozha Fault and Karakax Fault are likely to join together beyond a depth of ～200 km, which is the very zone of active seismicity.

关键词： west Kunlun, lithosphere, velocity perturbation, subduction.

On the Order of Magnitude of the Divisor Function

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Acta Mathematica Sinica,English Series 2006年第2期22卷 377-382页

作者： Michel WEBER Mathmatique Universit Louis-Pasteur et G.N.R.S.7 rue Rene Descartes. 67084-Strasbourg Cedex France

Let D be an increasing sequence of positive integers, and consider the divisor functions：d（n, D） =∑d｜n,d∈D,d≤√n1, d2（n,D）=∑[d,δ]｜n,d,δ∈D,[d,δ]≤√n1,where [d,δ]=1.c.m.（d,δ）. A probabilistic argumen... 详细信息

关键词： Divisor function Prime divisors Bernoulli random walk