519 research outputs found
Estudio Geológico Minero del Yacimiento de Scheelita El Salto. Departamento San Alberto, Pedanía Panaholma. Provincia de Córdoba
No full textFil: Oliveri, J. C. Ministerio de Industria de la Nación; ArgentinaFil: Lucero Michaut, H. N. Ministerio de Industria de la Nación; ArgentinaFil: Terrero, J. M. Ministerio de Industria de la Nación; ArgentinaFaltan mapa
Supporting Information for "Insights into Venus' crustal plateaus from dyke trajectories below craters" (Simulation results)
No full text<p>This repository contains the results presented in the article submitted to Journal of Geophysical Research: Planets entitle <em>"Insights into Venus'</em> crustal <em>plateaus from dyke trajectories below craters" </em>by Le Contellec A., Michaut C., Maccaferri F., Pinel V., Chambat F., Smrekar S.. </p>
<p>It provides the simulations parameters and results of dyke propagation in a crater stress field in the conditions of Venus, using the dyke propagation code developped by F. Maccaferri (Maccaferri et al, 2020) and a stress field computation code (Le Contellec, 2024) to compute the crater stress field. </p>
<p>The classification of the results corresponds to the categories defined in Section 4 of the article and are as follows: (1) corresponds to no dykes reaching the surface (green triangles), (2) to dykes reaching the surface within and outside the crater (blue dots), (3) to dykes reaching the surface exclusively within the crater (pink stars), and (4) to dykes reaching the surface exclusively outside the crater (orange diamonds).<br>Parameters used are: crater radius R in km, initial depth (i.e. crustal thickness) Di in km, magma density ⍴mag in kg.m3, crust density ⍴c in kg.m3, density ratio ⍴mag/⍴c, initial length of the dyke L in km, initial fluid overpressure calculated from Weertman's formula ΔPi (Equation 14 of the article) in MPa, maximum value of the stress component σrr,max in MPa, maximum shear stress component on the coordinate planes σrz,max in MPa, dimensionless number ẟ (Equation 18 of the article), dimensionless number Γ (Equation 16 of the article) and the classification of the simulation result (1 to 4 depending on the observed behaviour).</p>
TTF based charge transfer salts of M(NCS)(4)(C9H7N)(2) (-) where M = Cr, Fe and C9H7N = isoquinoline; observation of bulk ferrimagnetic order
No full textThree new charge transfer salts of BEDT-TTF and TTF with the counter ions [M(NCS)(4)(C9H7N)(2)](-) (M = Cr, Fe; C9H7N = isoquinoline) are described. The materials are prepared by standard electrocrystallisation techniques. The nature of the anion is verified in the crystal structure of the salt [C9H8N][Cr(NCS)(4)(C9H7N)]. C12H24O6. H2O which is used as the electrolyte when M = Cr. All of the charge transfer salts display long range ferrimagnetic order originating from the interaction between M (S = 3/2 or S = 5/2) and the donor (S = 1/2). The measured critical temperatures are 4.2 K (BEDT-TTF, M = Cr), 4.5 K (BEDT-TTF, M = Fe) and 8.9 K (TTF, M = Cr). Each of the compounds also shows a modest magnetic hysteresis of 338, 18 and 75 Oe for BEDT-TTF salts of M = Cr, Fe and the TTF salt of Cr, respectively
Réussite, échec et abandon des études dans l’enseignement supérieur français : quarante ans de recherche
No full textInternational audienc
Effets immédiats d'un effort concentrique quasi maximal sur la performance de type explosif
No full textMiller C., Quièvre Jacques, Couturier Antoine, Michaut Anne, Keifer Y., Legras F., Boucharin E., Colson Angeline, Colombo Claude. Effets immédiats d'un effort concentrique quasi maximal sur la performance de type explosif. In: Les Cahiers de l'INSEP, n°34, 2003. Expertise et sport de haut niveau. pp. 175-179
The effects of degassing on magmatic gas waves and long period eruptive precursors at silicic volcanoes
No full textAuthor Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 125 (10), (2020): e2020JB019755, https://doi.org/10.1029/2020JB019755Cyclical ground deformation, associated seismicity, and elevated degassing are important precursors to explosive eruptions at silicic volcanoes. Regular intervals for elevated activity (6–30 hr) have been observed at volcanoes such as Mount Pinatubo in the Philippines and Soufrière Hills in Montserrat. Here, we explore a hypothesis originally proposed by Michaut et al. (2013, https://doi.org/10.1038/ngeo1928) where porosity waves containing magmatic gas are responsible for the observed periodic behavior. We use two‐phase theory to construct a model where volatile‐rich, bubbly, viscous magma rises and decompresses. We conduct numerical experiments where magma gas waves with various frequencies are imposed at the base of the model volcanic conduit. We numerically verify the results of Michaut et al. (2013, https://doi.org/10.1038/ngeo1928) and then expand on the model by allowing magma viscosity to vary as a function of dissolved water and crystal content. Numerical experiments show that gas exsolution tends to damp the growth of porosity waves during decompression. The instability and resultant growth or decay of gas wave amplitude depends strongly on the gas density gradient and the ratio of the characteristic magma extraction rate to the characteristic magma degassing rate (Damköhler number, Da). We find that slow degassing can lead to a previously unrecognized filtering effect, where low‐frequency gas waves may grow in amplitude. These waves may set the periodicity of the eruptive precursors, such as those observed at Soufrière Hills Volcano. We demonstrate that degassed, crystal‐rich magma is susceptible to the growth of gas waves which may result in the periodic behavior.J. S. J. and D. B. were supported by NSF grant EAR‐1645057. C. M. has received financial support of the IDEXLyon Project of the University of Lyon in the frame of the Programme Investissements dAvenir (ANR‐16‐IDEX‐0005)
Les Ennemis de la vigne en Bourgogne, par G. Barbut,... C. Michaut,...
No full textAppartient à l’ensemble documentaire : Bourgogn1Avec mode text
A stress response factor regulates genes involved in cell growth, including Pol III-transcribed genes
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