431 research outputs found
Magnetic inference of in situ open microcracks in sandstone samples from the Taiwan Chelungpu Fault Drilling Project (TCDP)
No full text
particleShear: Discrete Python particle simulation with digital rheology and stress tensor evaluation
No full textparticleShear: Python package for particle shear simulation
This package provides a discrete particle simulation kit for having multiple spheres interacting. The spheres (i.e. 2D circles) interact by mutual elastic repulsion and tangential friction upon contact, but can also be crosslinked together. In addition to the elementary implementation of the interacting particles, it is also possible to define rheological experiments where the spheres are exposed to sinusoidally varying displacement conditions on the boundaries. We paid particular attention to avoid pitfalls that generate asymmetric stress tensors.
Acknowledgement: Thanks from the author go to Fabien Bonini and Joé Brefie-Guth for package testing, and to Daniel Lyobenov for initial help with simulation setup.
This repository archives the releases of the source code hosted at https://github.com/tbgitoo/particleShear. The package is available through the Python package server (see https://pypi.org/project/particleShear/1.0.2/). It can be installed automatically in python via
pip3 install particleShear
In some installations, the command may also be pip install particleShear; the minimal version of Python is 3.
Petrophysics of sedimentary rocks in compressive regime near active faults : examples of the Taiwan and Nankai accretionary prisms
No full textAnalyse pétrophysique et anisotropie des roches détritiques dans des systèmes en compression et sous influence de failles actives : Exemple des prismes de Taiwan et du prisme de Nankai (Japon)L'objectif de cette thèse est l'étude de la déformation enregistrée par des roches d'origine détritique dans des domaines sujets au raccourcissement tectonique sub-horizontal (Layer Parallel Shortening) et à des failles actives. Cette étude est basée sur la caractérisation de diverses propriétés physiques et de leur anisotropie à l'échelle de l'échantillon dans le but de décrire à plus grande échelle la structure d'un prisme d'accrétion. Deux prismes ont ainsi été échantillonnés, le premier est le prisme inactif de Taiwan dans le cadre du projet TCDP et le second considéré comme actif celui de Nankai dans le cadre du projet NanTroSeiZE. La microstructure d'une roche sédimentaire, y compris en l'absence de déformation tectonique, présente toujours une ou plusieurs caractéristique(s) anisotrope(s) liée(s) à la forme, à l'orientation préférentielle ou à l'arrangement de ses éléments constitutifs. De nombreux travaux ont porté sur les conséquences de ces anisotropies sur les propriétés physiques, d'abord dans un but prédictif, puis selon une démarche inverse visant à caractériser, à l'aide de modèles, microstructures et histoire tectonique associée. Dans cette thèse la confrontation des résultats obtenus pour différentes propriétés physiques (principalement vitesses des ondes acoustiques, susceptibilité magnétique et aimantation rémanente) met en évidence des réponses sélectives liées à un fort contrôle de la lithologie.Au niveau de prisme de Taiwan, deux résultats majeurs ont été obtenus. D'une part, la comparaison des anisotropies magnétiques et acoustiques a permis de montrer une évolution différentielle de la déformation entre les roches riches en matrice (siltite) par et celles plus riches en grain sableux (grès). D'autre part, les résultats combinés de l'anisotropie des ondes P, l'étude microstructurale et la minéralogie magnétique, montrent un comportement particulier des échantillons situé dans le mur de la faille FZB1136, considérée comme responsables du séisme de Chi-Chi en 1999. Un réseau de structures dilatantes fortement perméable à permis la circulation de fluides, de néo-cristallisation de calcite et de néoformation de minéraux magnétique. Sur le prisme de Nankai, une estimation de la quantification de la déformation enregistrée par les échantillons du prisme est modélisée en utilisant le modèle de March et les paramètres de susceptibilité magnétique. Les différents travaux réalisés dans cette thèse mettent en évidence un couplage direct de certaines propriétés physiques mesurées avec certains effets de déformation, chaque propriété caractérisant un point précis de la fabrique enregistré dans les roches.Mots-clefs : Anisotropie, susceptibilité magnétique, vitesses d'ondes ultrasoniques, déformation, fabrique, microstructures, faille inverse, TCDP, NanTroSeiZE.Petrophysics of sedimentary rocks in compressive regime near active faults: examples of the Taiwan and Nankai accretionary prismsThe objective of this PhD is to study the deformation recorded by detrital rocks in areas subject to sub-horizontal tectonic shortening (Layer Parallel Shortening) and active faults. This study is based on the characterization of various physical properties and their anisotropy at sample scale in order to describe larger-scale structure of an accretionary prism. Two prisms have been sampled, the first is the inactive in Taiwan prism (TCDP project) and the second active the Nankai prism (NanTroSeiZE project).Sedimentary rocks microstructures, regardless of the degree to which they were loaded tectonically, always present some anisotropic characteristic emerging from a preferential shape, orientation or distribution of its constituents. Numerous studies have focused on the effect of such anisotropies on physical properties, first for prediction purposes, then to conversely get diffuse strain insight through the use of various effective medium models. In this thesis, the comparison between results obtained in discrete samples for various physical properties (essentially acoustic wave velocities, magnetic susceptibility and remanent magnetization) reveals selective responses due to a strong lithologic control.In TCDP, two significant results are reported. On the one hand, comparison of magnetic and acoustic anisotropy showed a differential evolution of deformation between the matrix-rich rocks (siltstones) and those with coarser granular fraction (sandstone). On the other hand, the combined results of the anisotropy of P waves velocity, microstructural analysis and magnetic mineralogy, show a peculiar behavior of the samples located in the wall of the fault FZB1136, considered to be responsible of the Chi-Chi earthquake in 1999. A network of highly permeable dilatant structures allowed the circulation of fluids, neo-crystallization of calcite and neoformation of magnetic minerals. On the Nankai prism, an estimate of quantifying the deformation recorded by the samples of the prism is modeled using a simple March-type model and the parameters of magnetic susceptibility. The various work in this thesis show a direct coupling of physical properties measured with some aspect of deformation, each property characterizing a specific point of the fabric recorded in rocks.Keywords : Anisotropy, magnetic susceptibility, ultrasonic wave velocity, strain, fabric, microstructures, thrust fault, TCDP, NanTroSeiZE
Geochemical variation of intraplate magmatism and its sources in the Kaapvaal craton (Southern Africa) from Paleoarchean to present: implications for the evolution of its mantle lithosphere.
No full textInternational audienceThe Kaapvaal craton, which hosts rocks as old as 3.6 billion years, began to stabilize around 3.2 billion years ago with the progressive development of its subcontinental lithospheric mantle (SCLM). This craton, which has undergone continuous and relatively well-preserved geological evolution through numerous episodes of erosion, sedimentation and magmatic additions, provides a unique setting for studying the evolution of geodynamics. This study focuses primarily on the interpretation of existing literature and some newly acquired data for HFSE, REE and Lu-Hf and Sm-Nd isotopes, due to their immobility during low temperature alteration processes.The Palaeo-Mesoarchean transition marks significant changes in both geodynamic (from vertical to transitional tectonics) and magmatic processes. During this period, magmatism changed from mixed calc-alkaline and tholeiitic affinities derived from 'asthenospheric' sources to a pure tholeiitic series stemming from the (proto-)SCLM and/or asthenosphere. Almost all Meso- and Neoarchean igneous units show 'arc-like' geochemical signatures (e.g., negative Nb, Ta and Ti anomalies), mainly due to crustal assimilation. Only a few occurrences may reflect clear fluid metasomatism of the mantle sources. A major shift occurred in the early Paleoproterozoic, characterized by a protracted magmatic phase lasting over 500 Myr, with events showing significantly high Th/Nb ratios. These signatures are likely to be from refertilized sources, linked to a major metasomatic event and hence a significant but transient subduction (or comparable) process at the Archean-Proterozoic transition. After 1830 Ma, the frequency of magmatism decreases significantly, leaving only three major events (at ~1400, 1100 and 180 Ma), if we except kimberlites and lamproites. During this time, the Kaapvaal craton gradually evolved into a component of larger continental masses (i.e., proto-Kalahari then Kalahari cratons). However, these post-Paleoproterozoic events show much more diverse magmatic source signatures than earlier periods, including contributions from previously unobserved sources (e.g., OIB-like or enriched mantle OIB).The data suggest that most (but not all) post-Paleoarchean magmatic events are associated with plume-related activity involving melting of the SCLM at shallow depths (i.e., spinel mantle), consistent with conclusions from previous studies that considered these events separately. However, a relatively inert Late Mesoarchean SCLM alone would not be sufficient to generate such widespread and long-lasting magmatic activity, particularly if it exhibits enriched geochemical signatures. Overall, the geochemical data support an evolving SCLM that underwent periods of (local) melting, depletion and refertilization
Les bégonias : répertoire Mayol [illustration F. Fabiano] [photo non-créditée de Félix Mayol]
No full textLes bégonias : répertoire Mayol ; illustration F. Fabiano (pour Fabien Fabiano 1882-1962 - illustrateur) “publié avec l'autorisation du "Rire"” ; photo non-créditée de Félix Mayol ; paroles W. Burtey et R. Myra ; musique de Albert Tollet ; édition Mayol, 37 Faubourg Saint-Denis, Paris ; [intérieur : “créée par Mayol” “répertoire Mayol ; ss date, sans © ; cotage FM sans numéro ; imprimerie Dupré] ; catalogue verso 150 titres (medihal-00587546) ; incipit “Souvent sur votre passage” ; titre inconnu du catalogue BNF (musique imprimée 26/10/2016) ; datation (hypothèse Daphy à confirmer) 1915. Attestation d’un enregistrement par Félix Mayol chez Pathé (BNF), 1919 (source pour la date : catalogue Humbert)
Zeller à Zulke
No full textZELLER Humbert Né le 2 mai 1931 à Mulhouse (Haut-Rhin), fils de Jean Zeller assureur conseil (s. d.) et d’Anne-Marie Couttolenc. Licencié en droit et ès lettres, diplômé de l’IEP de Paris, École nationale des langues orientales vivantes, Éna (promotion Alexis de Tocqueville) 1960. Adjoint à l’Inspection 1er août 1960, inspecteur de 3e classe 1er août 1962, 2e classe 16 décembre 1965, 1re classe 1er octobre 1970, inspecteur général des Finances 1er janvier 1984, admis à la retraite par limite ..
Les bégonias : répertoire Mayol [illustration F. Fabiano] [photo non-créditée de Félix Mayol]
No full textLes bégonias : répertoire Mayol ; illustration F. Fabiano (pour Fabien Fabiano 1882-1962 - illustrateur) “publié avec l'autorisation du "Rire"” ; photo non-créditée de Félix Mayol ; paroles W. Burtey et R. Myra ; musique de Albert Tollet ; édition Mayol, 37 Faubourg Saint-Denis, Paris ; [intérieur : “créée par Mayol” “répertoire Mayol ; ss date, sans © ; cotage FM sans numéro ; imprimerie Dupré] ; catalogue verso 150 titres (medihal-00587546) ; incipit “Souvent sur votre passage” ; titre inconnu du catalogue BNF (musique imprimée 26/10/2016) ; datation (hypothèse Daphy à confirmer) 1915. Attestation d’un enregistrement par Félix Mayol chez Pathé (BNF), 1919 (source pour la date : catalogue Humbert)
Optimizing construction of scheduled data flow graph for on-line testability
Get PDFThe objective of this work is to develop a new methodology for behavioural synthesis using a flow of synthesis, better suited to the scheduling of independent calculations and non-concurrent online testing. The traditional behavioural synthesis process can be defined as the compilation of an algorithmic specification into an architecture composed of a data path and a controller. This stream of synthesis generally involves scheduling, resource allocation, generation of the data path and controller synthesis. Experiments showed that optimization started at the high level synthesis improves the performance of the result, yet the current tools do not offer synthesis optimizations that from the RTL level. This justifies the development of an optimization methodology which takes effect from the behavioural specification and accompanying the synthesis process in its various stages. In this paper we propose the use of algebraic properties (commutativity, associativity and distributivity) to transform readable mathematical formulas of algorithmic specifications into mathematical formulas evaluated efficiently. This will effectively reduce the execution time of scheduling calculations and increase the possibilities of testability
Dataset: Stability of hemicarbonate under cement paste-like conditions
No full textData, and scripts (analysis, plots) to go with the publication:
Stability of hemicarbonate under cement paste-like conditions
Fabien Georget (a,1,∗), Barbara Lothenbach (b) , William Wilson (a,c) , Franco Zunino (a) Karen L. Scrivener (a)
a: aboratory of Construction Materials, LMC, EPFL-STI-IMX, Station 12, CH-1015
Lausanne, Switzerland
b: Empa, Concrete & Asphalt Laboratory, Dübendorf, Switzerland
c: Sherbrooke University, Sherbrooke, Quebec, Canada
1: current address: Institute of Building Materials Research, RWTH Aachen, Aachen, Germany
* corresponding author
To be submitted to Cement and Concrete Researc
- …
