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description Publicationkeyboard_double_arrow_right Article , Preprint 2006 FrancePublisher:Springer Science and Business Media LLC Authors: Amitrano, David;Amitrano, David;International audience; The deformation of rocks is associated with microcracks nucleation and propagation, i.e. damage. The accumulation of damage and its spatial localization lead to the creation of a macroscale discontinuity, so-called "fault" in geological terms, and to the failure of the material, i.e. a dramatic decrease of the mechanical properties as strength and modulus. The damage process can be studied both statically by direct observation of thin sections and dynamically by recording acoustic waves emitted by crack propagation (acoustic emission). Here we first review such observations concerning geological objects over scales ranging from the laboratory sample scale (dm) to seismically active faults (km), including cliffs and rock masses (Dm, hm). These observations reveal complex patterns in both space (fractal properties of damage structures as roughness and gouge), time (clustering, particular trends when the failure approaches) and energy domains (power-law distributions of energy release bursts). We use a numerical model based on progressive damage within an elastic interaction framework which allows us to simulate these observations. This study shows that the failure in rocks can be the result of damage accumulation.
arXiv.org e-Print Ar... arrow_drop_down https://doi.org/10.1007/s10704...Article . 2006 . Peer-reviewedLicense: Springer TDMData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00172592v2/documentHAL - UPEC / UPEM; HAL-Pasteur; HAL-Inserm; HAL-IRDArticle . 2006https://doi.org/10.48550/arxiv...Article . 2007License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s10704-006-0053-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen 59 citations 59 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert arXiv.org e-Print Ar... arrow_drop_down https://doi.org/10.1007/s10704...Article . 2006 . Peer-reviewedLicense: Springer TDMData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00172592v2/documentHAL - UPEC / UPEM; HAL-Pasteur; HAL-Inserm; HAL-IRDArticle . 2006https://doi.org/10.48550/arxiv...Article . 2007License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s10704-006-0053-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2014 FrancePublisher:Elsevier BV Authors: Marchandise, Sandra; Robin, Eric; Ayrault, Sophie; Roy-Barman, Matthieu;Marchandise, Sandra; Robin, Eric; Ayrault, Sophie; Roy-Barman, Matthieu;International audience; The abundance, size and composition of micron-size U–Th–REE–Hf rich phases of marine clayey silt sediments from the Western Mediterranean Sea were determined using an automated scanning electron microscope equipped with an energy dispersive spectrometer. The minerals found in the sediment were monazite, allanite, florencite, xenotime and zircon. The size distribution and chemical composition of each phase were used to determine their contribution to the total content of the sediment in U, Th, REE, Y, Zr and Hf. Zircon accounts for most of the Zr and Hf of the sample. Xenotime and zircon account for most Y and HREE of the sample. However, the high Y–HREE–U–Th content of the zircons analyzed in this study (possibly due to xenotime overgrowth on zircon surface and alteration processes) contrasts with previous works and cannot be extended to any type of zircons. By contrast, only a small fraction (≈20–30%) of U, Th and LREE (such as Nd) are carried by U–Th–REE–Hf rich minerals (monazite mostly). It reflects the higher alterability of U–Th and LREE bearing phases compared to zircon and xenotime and implies that most U–Th and LREE are present in other phases at lower concentrations (possibly clays, organic matter or Fe–Mn oxides). The different size distributions of the different carriers can contribute to U–Th and LREE/HREE fractionation observed during the transport of these elements. Due to its very high physical and chemical resistance, zircon appears to be the main Hf carrier even in fine grained “zircon free type” sediments. By storing Lu and possibly releasing extremely radiogenic Hf, xenotime has an unforeseen role in the Lu–Hf systematics in marine sediment.
Geochimica et Cosmoc... arrow_drop_down Geochimica et Cosmochimica ActaArticle . 2014 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.gca.2014.01.017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 11 citations 11 popularity Average influence Average impulse Average Powered by BIP!more_vert Geochimica et Cosmoc... arrow_drop_down Geochimica et Cosmochimica ActaArticle . 2014 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.gca.2014.01.017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2017 FrancePublisher:Elsevier BV Pierrick Roperch; Jérôme Gattacceca; M. Valenzuela; Bertrand Devouard; Jean-Pierre Lorand; César Arriagada; Pierre Rochette; Claudio Latorre; Pierre Beck;International audience; We describe extended occurrences of unusual silicate glass surface layers from the Atacama Desert (Chile). These glasses, found near the town of Pica at four localities separated by up to 70 km, are neither fulgurites, nor volcanic glasses, nor metallurgical slags related to anthropic activity, but show close similarities to other glasses that have been previously attributed to large airbursts created by meteoroids entering the Earth's atmosphere. The glasses are restricted to specific Late Pleistocene terrains: paleo-wetlands and soils rich in organic matter with SiO2-rich plant remains, salts and carbonates. 14C dating and paleomagnetic data indicate that the glasses were formed during at least two distinct periods. This rules out the hypothesis of a single large airburst as the cause of surface melting. Instead, burning of organic-rich soils in dried-out grassy wetlands during climate oscillations between wet and dry periods can account for the formation of the Pica glasses. Large oases did indeed form in the hyperarid Atacama Desert due to elevated groundwater tables and increased surface discharge during the Central Andean Pluvial Event (roughly coeval with the Mystery interval and Younger Dryas). Finally, we discuss the implications of our results for the other surface glasses previously attributed to extraterrestrial events.
Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 2017 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.epsl.2017.04.009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 16 citations 16 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 2017 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.epsl.2017.04.009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2007 FrancePublisher:Oxford University Press (OUP) Xiaodong, Tan; Kennethp., Kodama; Gilder, Stuart,; Courtillot, Vincent; Cogné, Jean-Pascal;International audience; Fold axis strikes in the Yangtze fold belt of the South China Block (SCB) undergo significant changes over distances of >1000 km. This large-scale variation provides an ideal opportunity to test the oroclinal-bending hypothesis using palaeomagnetic methods, which we have attempted by drilling the Lower Triassic Daye Formation limestones in western Hubei Province. Thermal demagnetization isolated two components in most samples. A low unblocking temperature component (400 °C , unblocks univectorially towards the origin. The HTC passes the McFadden-fold test with an overall mean tilt-corrected direction of Dec = 255°, Inc =-24° (N= 7, α95= 9°) . Scanning electron microscopy (SEM) observations suggest an early diagenetic, possible (bio)chemical origin for the magnetic extracts dominated by Ti-poor magnetite. Rock magnetic data show no evidence that the HTC has been affected by tectonic or compaction strain. Our data together with previously published results suggest a general clockwise rotation pattern in the Middle Yangtze fold belt, which is probably related to the collision between the North and SCBs. Comparison of palaeomagnetic rotations with fold axis trends in the fold belt suggests that about 30° clockwise rotation occurred in the Middle reaches of the Yangtze River, while a 15° difference in fold axis trends would be due to initial variation within the fold belt. However, since little is known about the timing of the clockwise rotation, whether the Middle Yangtze fold belt is an orocline awaits further studies.
Geophysical Journal ... arrow_drop_down HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2006Mémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00271617/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/j.1365-246x.2006.03195.x&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 30 citations 30 popularity Average influence Average impulse Average Powered by BIP!more_vert Geophysical Journal ... arrow_drop_down HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2006Mémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00271617/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/j.1365-246x.2006.03195.x&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1967 FrancePublisher:Elsevier BV Authors: Lambert, G.; Lorius, C.; Ardouin, B.;Lambert, G.; Lorius, C.; Ardouin, B.;Abstract The measurement of the β activity in firn samples from Antarctica enabled us to determine the snow accumulation by means of the layer of artificial radioactive fallout formed in the beginning of 1955. The mean annual value of 21 cm water is in good agreement with the measurements made on snow accumulation stakes, while the irregularity of annual snow deposits makes it difficult to use other methods. The fluctuations observed in artificial β activity seem linked not only to nuclear explosions but also to atmospheric processes, as suggested by comparing these fluctuations with those of α activity due to lead 210.
Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 1967 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/0012-821x(67)90073-8&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu5 citations 5 popularity Average influence Top 10% impulse Average Powered by BIP!more_vert Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 1967 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/0012-821x(67)90073-8&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2014 FrancePublisher:Oxford University Press (OUP) Authors: Abhra Giri; Sujata Tarafdar; Philippe Gouze; Tapati Dutta;Abhra Giri; Sujata Tarafdar; Philippe Gouze; Tapati Dutta;It is well known that sedimentary rocks having same porosity can have very different pore size distribution. The pore distribution determines many characteristics of the rock among which, its transport property is often the most useful. Multifractal analysis is a powerful tool that is increasingly used to characterize the pore space. In this study we have done multifractal analysis of pore distribution on sedimentary rocks simulated using the Relaxed Bidisperse Ballistic Model (RBBDM). The RBBDM can generate a $3-D$ structure of sedimentary rocks of variable porosity by tuning the fraction $p$ of particles of two different sizes. We have also done multifractal analysis on two samples of real sedimentary rock to compare with the simulation studies. One sample, an oolitic limestone is of high porosity (40%)while the other is a reefal carbonate of low porosity around 7%. $2-D$ sections of X-ray micro-tomographs of the real rocks were stacked sequentially to reconstruct the real rock specimens. Both samples show a multifractal character, but we show that RBBDM gives a very realistic representation of a typical high porosity sedimentary rock. Comment: 9 figures
Geophysical Journal ... arrow_drop_down Mémoires en Sciences de l'Information et de la CommunicationArticle . 2015License: CC BYFull-Text: https://hal.science/hal-01174142/documenthttps://doi.org/10.48550/arxiv...Article . 2013License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/gji/ggu417&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 10 citations 10 popularity Average influence Average impulse Average Powered by BIP!more_vert Geophysical Journal ... arrow_drop_down Mémoires en Sciences de l'Information et de la CommunicationArticle . 2015License: CC BYFull-Text: https://hal.science/hal-01174142/documenthttps://doi.org/10.48550/arxiv...Article . 2013License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/gji/ggu417&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2001 FrancePublisher:American Geophysical Union (AGU) Parrenin, Frédéric; Jouzel, Jean; Waelbroeck, Claire; Ritz, Catherine; Barnola, Jean-Marc;doi: 10.1029/2001jd900245
International audience; Using the chronological information available in the Vostok records, we apply an inverse method to assess the quality of the Vostok glaciological timescale. The inversion procedure provides not only an optimized glaciological timescale and its confidence interval but also a reliable estimate of the duration of successive events. Our results highlight a disagreement between orbitally tuned and glaciological timescales below ∼2700 m (i.e., ∼250 kyr B.P., thousands of years before present). This disagreement could be caused by some discontinuity in the spatial variation of accumulation upstream of Vostok. Moreover, the stratigraphic datings of central Greenland ice cores (GRIP and GISP2) appear older than our optimized timescale for the late glacial. This underlines an unconsistency between the physical assumptions used to construct the Vostok glaciological timescale and the stratigraphic datings. The inverse method allows the first assessment of the evolution of the phase between Vostok climatic records and insolation. This phase significantly varies with time which gives a measure of the nonlinear character of the climatic system and suggests that the climatic response to orbital forcing is of different nature for glacial and interglacial periods. We confirm that the last interglacial, as recorded in the Vostok deuterium record, was long (16.2±2 kyr, thousands of years). However, midtransition of termination II occurred at 133.4±2.5 kyr BP, which does not support the recent claim for an earlier deglaciation. Finally, our study suggests that temperature changes are correctly estimated when using the spatial present‐day deuterium‐temperature relationship to interpret the Vostok deuterium record.
Journal of Geophysic... arrow_drop_down Journal of Geophysical Research AtmospheresArticle . 2001 . Peer-reviewedLicense: Wiley Online Library User AgreementData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2001jd900245&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 71 citations 71 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Journal of Geophysic... arrow_drop_down Journal of Geophysical Research AtmospheresArticle . 2001 . Peer-reviewedLicense: Wiley Online Library User AgreementData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2001jd900245&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2017 FrancePublisher:Copernicus GmbH Funded by:ANR | DREAMANR| DREAMThomas Chauve; Maurine Montagnat; Cédric Lachaud; David Georges; Pierre Vacher;Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.
Solid Earth (SE) arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; HAL-IRDArticle . 2017License: CC BY NCFull-Text: https://hal.science/hal-01698762/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/se-8-943-2017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 8 citations 8 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Solid Earth (SE) arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; HAL-IRDArticle . 2017License: CC BY NCFull-Text: https://hal.science/hal-01698762/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/se-8-943-2017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2018 FrancePublisher:Elsevier BV Beainy, Georges; Alcotte, Reynald; Bassani, Franck; Martin, Mickaël; Grenier, Adeline; Baron, Thierry; Barnes, Jean-Paul;International audience; In this contribution, we report on the Si atoms spatial distribution via Atom Probe Tomography (APT) in Si-doped GaAs thin films grown by MOCVD. As a result, we clearly identify the presence of Si precipitates occurring with increasing Si content in the layers. Using ToF-SIMS characterizations, we have been able to highlight the increasing evolution of the silicon content in the material as a function of silicon flux while that of the charge carriers studied by Hall effect decreases. Thus, this degradation of the electrical properties was directly linked to the observed clusters by APT.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.scriptamat.2018.05.007&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu3 citations 3 popularity Average influence Average impulse Average Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.scriptamat.2018.05.007&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2012 FrancePublisher:EDP Sciences Andrii Elyiv; N. Clerc; Manolis Plionis; Jean Surdej; Marguerite Pierre; Spyros Basilakos; L. Chiappetti; Poshak Gandhi; Eric Gosset; O. V. Melnyk; Florian Pacaud;Our aim is to study the large-scale structure of different types of AGN using the medium-deep XMM-LSS survey. We measure the two-point angular correlation function of ~ 5700 and 2500 X-ray point-like sources over the ~ 11 sq. deg. XMM-LSS field in the soft (0.5-2 keV) and hard (2-10 keV) bands. For the conversion from the angular to the spatial correlation function we used the Limber integral equation and the luminosity-dependent density evolution model of the AGN X-ray luminosity function. We have found significant angular correlations with the power-law parameters gamma = 1.81 +/- 0.02, theta_0 = 1.3" +/- 0.2" for the soft, and gamma = 2.00 +/- 0.04, theta_0 = 7.3" +/- 1.0" for the hard bands. The amplitude of the correlation function w(theta) is higher in the hard than in the soft band for f_x < 10^-14 erg s^-1 cm^-2 and lower above this flux limit. We confirm that the clustering strength theta_0 grows with the flux limit of the sample, a trend which is also present in the amplitude of the spatial correlation function, but only for the soft band. In the hard band, it remains almost constant with r_0 = 10h^-1$ Mpc, irrespective of the flux limit. Our analysis of AGN subsamples with different hardness ratios shows that the sources with a hard-spectrum are more clustered than soft-spectrum ones. This result may be a hint that the two main types of AGN populate different environments. Finally, we find that our clustering results correspond to an X-ray selected AGN bias factor of ~ 2.5 for the soft-band sources (at a median z = 1.1) and ~ 3.3 for the hard-band sources (at a median z = 1), which translates into a host dark matter halo mass of ~ 10^13 h^-1 M_o and ~ 10^13.7 h^-1 M_o for the soft and hard bands, respectively. 14 pages, 27 figures, accepted for publication in Astronomy and Astrophysics
Astronomy and Astrop... arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2011License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201117983&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 31 citations 31 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Astronomy and Astrop... arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2011License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201117983&type=result"></script>'); --> </script>
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description Publicationkeyboard_double_arrow_right Article , Preprint 2006 FrancePublisher:Springer Science and Business Media LLC Authors: Amitrano, David;Amitrano, David;International audience; The deformation of rocks is associated with microcracks nucleation and propagation, i.e. damage. The accumulation of damage and its spatial localization lead to the creation of a macroscale discontinuity, so-called "fault" in geological terms, and to the failure of the material, i.e. a dramatic decrease of the mechanical properties as strength and modulus. The damage process can be studied both statically by direct observation of thin sections and dynamically by recording acoustic waves emitted by crack propagation (acoustic emission). Here we first review such observations concerning geological objects over scales ranging from the laboratory sample scale (dm) to seismically active faults (km), including cliffs and rock masses (Dm, hm). These observations reveal complex patterns in both space (fractal properties of damage structures as roughness and gouge), time (clustering, particular trends when the failure approaches) and energy domains (power-law distributions of energy release bursts). We use a numerical model based on progressive damage within an elastic interaction framework which allows us to simulate these observations. This study shows that the failure in rocks can be the result of damage accumulation.
arXiv.org e-Print Ar... arrow_drop_down https://doi.org/10.1007/s10704...Article . 2006 . Peer-reviewedLicense: Springer TDMData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00172592v2/documentHAL - UPEC / UPEM; HAL-Pasteur; HAL-Inserm; HAL-IRDArticle . 2006https://doi.org/10.48550/arxiv...Article . 2007License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s10704-006-0053-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen 59 citations 59 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert arXiv.org e-Print Ar... arrow_drop_down https://doi.org/10.1007/s10704...Article . 2006 . Peer-reviewedLicense: Springer TDMData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00172592v2/documentHAL - UPEC / UPEM; HAL-Pasteur; HAL-Inserm; HAL-IRDArticle . 2006https://doi.org/10.48550/arxiv...Article . 2007License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1007/s10704-006-0053-z&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2014 FrancePublisher:Elsevier BV Authors: Marchandise, Sandra; Robin, Eric; Ayrault, Sophie; Roy-Barman, Matthieu;Marchandise, Sandra; Robin, Eric; Ayrault, Sophie; Roy-Barman, Matthieu;International audience; The abundance, size and composition of micron-size U–Th–REE–Hf rich phases of marine clayey silt sediments from the Western Mediterranean Sea were determined using an automated scanning electron microscope equipped with an energy dispersive spectrometer. The minerals found in the sediment were monazite, allanite, florencite, xenotime and zircon. The size distribution and chemical composition of each phase were used to determine their contribution to the total content of the sediment in U, Th, REE, Y, Zr and Hf. Zircon accounts for most of the Zr and Hf of the sample. Xenotime and zircon account for most Y and HREE of the sample. However, the high Y–HREE–U–Th content of the zircons analyzed in this study (possibly due to xenotime overgrowth on zircon surface and alteration processes) contrasts with previous works and cannot be extended to any type of zircons. By contrast, only a small fraction (≈20–30%) of U, Th and LREE (such as Nd) are carried by U–Th–REE–Hf rich minerals (monazite mostly). It reflects the higher alterability of U–Th and LREE bearing phases compared to zircon and xenotime and implies that most U–Th and LREE are present in other phases at lower concentrations (possibly clays, organic matter or Fe–Mn oxides). The different size distributions of the different carriers can contribute to U–Th and LREE/HREE fractionation observed during the transport of these elements. Due to its very high physical and chemical resistance, zircon appears to be the main Hf carrier even in fine grained “zircon free type” sediments. By storing Lu and possibly releasing extremely radiogenic Hf, xenotime has an unforeseen role in the Lu–Hf systematics in marine sediment.
Geochimica et Cosmoc... arrow_drop_down Geochimica et Cosmochimica ActaArticle . 2014 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.gca.2014.01.017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 11 citations 11 popularity Average influence Average impulse Average Powered by BIP!more_vert Geochimica et Cosmoc... arrow_drop_down Geochimica et Cosmochimica ActaArticle . 2014 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.gca.2014.01.017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2017 FrancePublisher:Elsevier BV Pierrick Roperch; Jérôme Gattacceca; M. Valenzuela; Bertrand Devouard; Jean-Pierre Lorand; César Arriagada; Pierre Rochette; Claudio Latorre; Pierre Beck;International audience; We describe extended occurrences of unusual silicate glass surface layers from the Atacama Desert (Chile). These glasses, found near the town of Pica at four localities separated by up to 70 km, are neither fulgurites, nor volcanic glasses, nor metallurgical slags related to anthropic activity, but show close similarities to other glasses that have been previously attributed to large airbursts created by meteoroids entering the Earth's atmosphere. The glasses are restricted to specific Late Pleistocene terrains: paleo-wetlands and soils rich in organic matter with SiO2-rich plant remains, salts and carbonates. 14C dating and paleomagnetic data indicate that the glasses were formed during at least two distinct periods. This rules out the hypothesis of a single large airburst as the cause of surface melting. Instead, burning of organic-rich soils in dried-out grassy wetlands during climate oscillations between wet and dry periods can account for the formation of the Pica glasses. Large oases did indeed form in the hyperarid Atacama Desert due to elevated groundwater tables and increased surface discharge during the Central Andean Pluvial Event (roughly coeval with the Mystery interval and Younger Dryas). Finally, we discuss the implications of our results for the other surface glasses previously attributed to extraterrestrial events.
Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 2017 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.epsl.2017.04.009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 16 citations 16 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 2017 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.epsl.2017.04.009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2007 FrancePublisher:Oxford University Press (OUP) Xiaodong, Tan; Kennethp., Kodama; Gilder, Stuart,; Courtillot, Vincent; Cogné, Jean-Pascal;International audience; Fold axis strikes in the Yangtze fold belt of the South China Block (SCB) undergo significant changes over distances of >1000 km. This large-scale variation provides an ideal opportunity to test the oroclinal-bending hypothesis using palaeomagnetic methods, which we have attempted by drilling the Lower Triassic Daye Formation limestones in western Hubei Province. Thermal demagnetization isolated two components in most samples. A low unblocking temperature component (400 °C , unblocks univectorially towards the origin. The HTC passes the McFadden-fold test with an overall mean tilt-corrected direction of Dec = 255°, Inc =-24° (N= 7, α95= 9°) . Scanning electron microscopy (SEM) observations suggest an early diagenetic, possible (bio)chemical origin for the magnetic extracts dominated by Ti-poor magnetite. Rock magnetic data show no evidence that the HTC has been affected by tectonic or compaction strain. Our data together with previously published results suggest a general clockwise rotation pattern in the Middle Yangtze fold belt, which is probably related to the collision between the North and SCBs. Comparison of palaeomagnetic rotations with fold axis trends in the fold belt suggests that about 30° clockwise rotation occurred in the Middle reaches of the Yangtze River, while a 15° difference in fold axis trends would be due to initial variation within the fold belt. However, since little is known about the timing of the clockwise rotation, whether the Middle Yangtze fold belt is an orocline awaits further studies.
Geophysical Journal ... arrow_drop_down HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2006Mémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00271617/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/j.1365-246x.2006.03195.x&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 30 citations 30 popularity Average influence Average impulse Average Powered by BIP!more_vert Geophysical Journal ... arrow_drop_down HAL-Pasteur; HAL-Inserm; Hal-DiderotArticle . 2006Mémoires en Sciences de l'Information et de la CommunicationArticle . 2006Full-Text: https://hal.science/hal-00271617/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/j.1365-246x.2006.03195.x&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1967 FrancePublisher:Elsevier BV Authors: Lambert, G.; Lorius, C.; Ardouin, B.;Lambert, G.; Lorius, C.; Ardouin, B.;Abstract The measurement of the β activity in firn samples from Antarctica enabled us to determine the snow accumulation by means of the layer of artificial radioactive fallout formed in the beginning of 1955. The mean annual value of 21 cm water is in good agreement with the measurements made on snow accumulation stakes, while the irregularity of annual snow deposits makes it difficult to use other methods. The fluctuations observed in artificial β activity seem linked not only to nuclear explosions but also to atmospheric processes, as suggested by comparing these fluctuations with those of α activity due to lead 210.
Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 1967 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/0012-821x(67)90073-8&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu5 citations 5 popularity Average influence Top 10% impulse Average Powered by BIP!more_vert Earth and Planetary ... arrow_drop_down Earth and Planetary Science LettersArticle . 1967 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/0012-821x(67)90073-8&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2014 FrancePublisher:Oxford University Press (OUP) Authors: Abhra Giri; Sujata Tarafdar; Philippe Gouze; Tapati Dutta;Abhra Giri; Sujata Tarafdar; Philippe Gouze; Tapati Dutta;It is well known that sedimentary rocks having same porosity can have very different pore size distribution. The pore distribution determines many characteristics of the rock among which, its transport property is often the most useful. Multifractal analysis is a powerful tool that is increasingly used to characterize the pore space. In this study we have done multifractal analysis of pore distribution on sedimentary rocks simulated using the Relaxed Bidisperse Ballistic Model (RBBDM). The RBBDM can generate a $3-D$ structure of sedimentary rocks of variable porosity by tuning the fraction $p$ of particles of two different sizes. We have also done multifractal analysis on two samples of real sedimentary rock to compare with the simulation studies. One sample, an oolitic limestone is of high porosity (40%)while the other is a reefal carbonate of low porosity around 7%. $2-D$ sections of X-ray micro-tomographs of the real rocks were stacked sequentially to reconstruct the real rock specimens. Both samples show a multifractal character, but we show that RBBDM gives a very realistic representation of a typical high porosity sedimentary rock. Comment: 9 figures
Geophysical Journal ... arrow_drop_down Mémoires en Sciences de l'Information et de la CommunicationArticle . 2015License: CC BYFull-Text: https://hal.science/hal-01174142/documenthttps://doi.org/10.48550/arxiv...Article . 2013License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/gji/ggu417&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 10 citations 10 popularity Average influence Average impulse Average Powered by BIP!more_vert Geophysical Journal ... arrow_drop_down Mémoires en Sciences de l'Information et de la CommunicationArticle . 2015License: CC BYFull-Text: https://hal.science/hal-01174142/documenthttps://doi.org/10.48550/arxiv...Article . 2013License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/gji/ggu417&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2001 FrancePublisher:American Geophysical Union (AGU) Parrenin, Frédéric; Jouzel, Jean; Waelbroeck, Claire; Ritz, Catherine; Barnola, Jean-Marc;doi: 10.1029/2001jd900245
International audience; Using the chronological information available in the Vostok records, we apply an inverse method to assess the quality of the Vostok glaciological timescale. The inversion procedure provides not only an optimized glaciological timescale and its confidence interval but also a reliable estimate of the duration of successive events. Our results highlight a disagreement between orbitally tuned and glaciological timescales below ∼2700 m (i.e., ∼250 kyr B.P., thousands of years before present). This disagreement could be caused by some discontinuity in the spatial variation of accumulation upstream of Vostok. Moreover, the stratigraphic datings of central Greenland ice cores (GRIP and GISP2) appear older than our optimized timescale for the late glacial. This underlines an unconsistency between the physical assumptions used to construct the Vostok glaciological timescale and the stratigraphic datings. The inverse method allows the first assessment of the evolution of the phase between Vostok climatic records and insolation. This phase significantly varies with time which gives a measure of the nonlinear character of the climatic system and suggests that the climatic response to orbital forcing is of different nature for glacial and interglacial periods. We confirm that the last interglacial, as recorded in the Vostok deuterium record, was long (16.2±2 kyr, thousands of years). However, midtransition of termination II occurred at 133.4±2.5 kyr BP, which does not support the recent claim for an earlier deglaciation. Finally, our study suggests that temperature changes are correctly estimated when using the spatial present‐day deuterium‐temperature relationship to interpret the Vostok deuterium record.
Journal of Geophysic... arrow_drop_down Journal of Geophysical Research AtmospheresArticle . 2001 . Peer-reviewedLicense: Wiley Online Library User AgreementData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2001jd900245&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 71 citations 71 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Journal of Geophysic... arrow_drop_down Journal of Geophysical Research AtmospheresArticle . 2001 . Peer-reviewedLicense: Wiley Online Library User AgreementData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2001jd900245&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2017 FrancePublisher:Copernicus GmbH Funded by:ANR | DREAMANR| DREAMThomas Chauve; Maurine Montagnat; Cédric Lachaud; David Georges; Pierre Vacher;Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.
Solid Earth (SE) arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; HAL-IRDArticle . 2017License: CC BY NCFull-Text: https://hal.science/hal-01698762/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/se-8-943-2017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 8 citations 8 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Solid Earth (SE) arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; HAL-IRDArticle . 2017License: CC BY NCFull-Text: https://hal.science/hal-01698762/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/se-8-943-2017&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2018 FrancePublisher:Elsevier BV Beainy, Georges; Alcotte, Reynald; Bassani, Franck; Martin, Mickaël; Grenier, Adeline; Baron, Thierry; Barnes, Jean-Paul;International audience; In this contribution, we report on the Si atoms spatial distribution via Atom Probe Tomography (APT) in Si-doped GaAs thin films grown by MOCVD. As a result, we clearly identify the presence of Si precipitates occurring with increasing Si content in the layers. Using ToF-SIMS characterizations, we have been able to highlight the increasing evolution of the silicon content in the material as a function of silicon flux while that of the charge carriers studied by Hall effect decreases. Thus, this degradation of the electrical properties was directly linked to the observed clusters by APT.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.scriptamat.2018.05.007&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu3 citations 3 popularity Average influence Average impulse Average Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.scriptamat.2018.05.007&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2012 FrancePublisher:EDP Sciences Andrii Elyiv; N. Clerc; Manolis Plionis; Jean Surdej; Marguerite Pierre; Spyros Basilakos; L. Chiappetti; Poshak Gandhi; Eric Gosset; O. V. Melnyk; Florian Pacaud;Our aim is to study the large-scale structure of different types of AGN using the medium-deep XMM-LSS survey. We measure the two-point angular correlation function of ~ 5700 and 2500 X-ray point-like sources over the ~ 11 sq. deg. XMM-LSS field in the soft (0.5-2 keV) and hard (2-10 keV) bands. For the conversion from the angular to the spatial correlation function we used the Limber integral equation and the luminosity-dependent density evolution model of the AGN X-ray luminosity function. We have found significant angular correlations with the power-law parameters gamma = 1.81 +/- 0.02, theta_0 = 1.3" +/- 0.2" for the soft, and gamma = 2.00 +/- 0.04, theta_0 = 7.3" +/- 1.0" for the hard bands. The amplitude of the correlation function w(theta) is higher in the hard than in the soft band for f_x < 10^-14 erg s^-1 cm^-2 and lower above this flux limit. We confirm that the clustering strength theta_0 grows with the flux limit of the sample, a trend which is also present in the amplitude of the spatial correlation function, but only for the soft band. In the hard band, it remains almost constant with r_0 = 10h^-1$ Mpc, irrespective of the flux limit. Our analysis of AGN subsamples with different hardness ratios shows that the sources with a hard-spectrum are more clustered than soft-spectrum ones. This result may be a hint that the two main types of AGN populate different environments. Finally, we find that our clustering results correspond to an X-ray selected AGN bias factor of ~ 2.5 for the soft-band sources (at a median z = 1.1) and ~ 3.3 for the hard-band sources (at a median z = 1), which translates into a host dark matter halo mass of ~ 10^13 h^-1 M_o and ~ 10^13.7 h^-1 M_o for the soft and hard bands, respectively. 14 pages, 27 figures, accepted for publication in Astronomy and Astrophysics
Astronomy and Astrop... arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2011License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201117983&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 31 citations 31 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Astronomy and Astrop... arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2011License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201117983&type=result"></script>'); --> </script>
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