2,403 research outputs found
Tradução de uma disputa : Christophe versus Pétion em La tragédie du roi Christophe, de Aimé Césaire
No full textEsta contribuição propõe a tradução comentada da primeira cena da peça de teatro La Tragédie du roi Christophe (A tragédia do rei Christophe), de Aimé Césaire. O texto foi publicado pelo autor martinicano em 1963 e encenado a partir de 1964. A história aborda o embate histórico entre os dois líderes revolucionários haitianos, Alexandre Pétion (1770-1818) e Henry Christophe (1767-1820), após o estabelecimento da independência do Haiti, em 1804. O ex-escravizado Henry Christophe I, autoproclamado rei do Haiti em 1811, protagoniza, na peça, os impasses políticos decorrentes do processo de descolonização para a constituição de um novo estado haitiano livre e democrático. Optamos por traduzir a cena que anuncia e ilustra, na abertura do primeiro Ato, o caráter trágico que permeia o desenrolar dos eventos.This contribution proposes the commented translation of the first scene of the play La Tragédie du roi Christophe (The tragedy of King Christophe), by Aimé Césaire. The text was published by the Martinican author in 1963 and staged from 1964 onwards. The story addresses the historical clash between the two Haitian revolutionary leaders, Alexandre Pétion (1770-1818) and Henry Christophe (1767-1820), after the establishment of Haitian independence in 1804. The ex-enslaved Henry Christophe I, self-proclaimed King of Haiti in 1811, stars, in the play, political impasses resulting from the decolonization process, for the constitution of a new free and democratic Haitian state. We chose to translate the scene that announces and illustrates, in the opening of the first Act, the tragic character that permeates the unfolding of events
Decomposition of molybdate–hexamethylenetetramine complex: One single source route for different catalytic materials
No full textChouzier, Sandra Czeri, Tivadar Roy-Auberger, Magalie Pichon, Christophe Geantet, Christophe Vrinat, Michel Afanasiev, PavelDecomposition of ammonium heptamolybdate-hexamethylentetramine (HMTA) complex (HMTA)(2)(NH(4))(4)Mo(7)O(24)center dot 2H(2)O was studied as a function of treatment conditions in the range 300-1173 K. The evolution of solid products during decomposition was studied by thermal analysis and in situ EXAFS. Depending on the nature of the gas used for treatment, single phases of highly dispersed nitrides Mo(2)N, carbide Mo(2)C, or oxide MoO(2) can be obtained. The nature of the products obtained was explained by qualitative thermodynamical considerations. Morphology of the solids considerably depends on such preparation parameters as temperature and mass velocity of the gas flow. For the nitride-based materials, catalytic activity was evaluated in the model thiophene HDS reaction. It was demonstrated that NH(3)-treated samples showed better catalytic activity than N(2)-treated ones due to cleaner surface and better morphology. Transmission microscopy, XRD and XPS studies showed that MoS(2) is formed on the surface during HDS reaction or sulfidation with H(2)S. Optimized nitride-derived catalysts showed mass activity several times higher than unsupported MoS(2) or MoS(2)/Al(2)O(3) reference catalyst. (C) 2011 Elsevier Inc. All rights reserved
Lattice melting in perpetually pulsating equilibria
No full textInternational audienceSystems whose potential energies consists of pieces that scale as r, together with pieces that scale as r, show no violent relaxation to Virial equilibrium, but may pulsate at considerable amplitude for ever. Despite this pulsation these systems form lattices when the non-pulsational energy is low, and these disintegrate as that energy is increased. The quasi specific heats show the expected halving as the 'solid' is gradually replaced by the gas of independent particles. The forms of the lattices are described here for N⩽20 while they become hexagonal close packed for large N. In the larger N limit, a shell structure is formed. Their large N behaviour is analogous to a γ=5/3 polytropic gas with a quasi-gravity such that every element of fluid attracts every other in proportion to their separation. To cite this article: C. Pichon, D. Lynden-Bell, C. R. Physique 7 (2006)
Sequences downstream of the bHLH domain of the Xenopus hairy-related transcription factor-1 act as an extended dimerization domain that contributes to the selection of the partners
No full textXHRT1 is a member of the HRT/Hey protein subfamily that are known as Notch effectors. XHRT1 is expressed in the developing floor plate and encodes a basic helix-loop-helix (bHLH) transcription repressor. Here, we show that XHRT1 misexpression in the neural plate inhibits differentiation of neural precursor cells and thus may be important for floor plate cells to prevent them from adopting a neuronal fate. Deletion analysis indicated that inhibition of differentiation by XHRT1 requires the DNA-binding bHLH motif and either the Orange domain or the C-terminal region. XHRT1 could efficiently homodimerize and heterodimerize with hairy proteins. Among those hairy genes, Xhairy2b shows extensive overlap of expression with XHRT1 in floor plate precursors and may be a biologically relevant XHRT1 partner. Dimerization is mediated through both the bHLH and downstream sequences, the Orange domain being particularly important for the efficiency of the interaction. Using chimeric constructs between XHRT1 and the ESR9 bHLH-O protein that does not interact with Xhairy1 and Xhairy2b, we found that both the bHLH domain and downstream sequences of XHRT1 were required for heterodimerization with Xhairy2b, while only the XHRT1 sequences downstream of the Orange domain are required for the interaction with Xhairy1. Together, these results suggest that XHRT1 plays a role in floor plate cell development and highlight the importance of the Orange and downstream sequences in dimerization and in the selection of the bHLH partners.Comparative StudyJournal ArticleResearch Support, Non-U.S. Gov'tSCOPUS: ar.jinfo:eu-repo/semantics/publishe
Morisset/PyNeb_devel: 1.1.9
No full textcommit ab6cdb8a4af2ff75b82fc1422004934945c82530
Author: morisset [email protected]
Date: Sat Jul 6 11:25:45 2019 -0700
1.1.9
V 1.1.9
commit f7e6a418d2affb8db163c8c6c2428173b5f4aacf
Author: morisset [email protected]
Date: Fri Jun 7 07:15:42 2019 -0700
Create _chianti_tools_9.py
commit 81213b885e2b359a62e3d6e73515e39dc7056561
Author: Christophe Morisset [email protected]
Date: Wed Jun 5 16:19:33 2019 -0700
Adding Chianti 9
commit 5a9a7dfc9a4d922a216ac11f39b76c2d63097d3b
Author: Christophe Morisset [email protected]
Date: Wed Jun 5 16:19:05 2019 -0700
1.1.9b4
commit 152f9192847cd7f3194e0a778caca66f966392c1
Author: morisset [email protected]
Date: Wed May 22 14:13:30 2019 -0700
T_min ans max were not used
commit 22aeec4db4efc7bcc377b54a92292e157335825d
Author: morisset [email protected]
Date: Sun May 19 10:18:52 2019 -0700
1.1.9b3
commit 4dc721eecdd2511fcde69f835fc6181f7be1b74d
Author: morisset [email protected]
Date: Sun May 19 10:18:34 2019 -0700
manage wl<Lyalpha master
commit 44192233b57ef46cc479e6bfc2a9020cbfc3d5f6
Author: morisset [email protected]
Date: Fri May 17 13:07:55 2019 -0700
1.1.9b2
commit 95e07d78fb38cc6267f38e11d3051738814a4dfd
Author: morisset [email protected]
Date: Fri May 17 13:07:47 2019 -0700
light wl array
commit 9a159290e931fbdbbff8b13968d7540f8b0cef18
Author: morisset [email protected]
Date: Fri May 17 13:07:27 2019 -0700
add continuum to init
commit da0e0b6ac19bc6808bc7366217ad4a0885e1ca0e
Author: morisset [email protected]
Date: Thu Mar 21 11:48:08 2019 -0300
1.1.9b1
before branch to Regresor developemen
Plurilinguisme et enseignement des mathématiques: Mise en perspective des Journées Plurimaths 2020
No full textInternational audienceCroisement de deux point de vue : les langages pour dire-penser- faire les mathématiques d'une part, et les mathématiques qui se font, existent et se transmettent par les langages d'autre part. Pour donner à voir, à lire, à faire, à penser, à imaginer, trente chercheurs, formateurs, praticiens ont accordé leur savoir et savoir-faire pour composer cet opus de treize chapitres.Auteurs : Myriam ABOU-SAMRA, Nathalie AUGER, Céline BEAUGRAND, Michel CANDELIER, Julie CANDY , Alexandre CA V ALCANTE, Aurélie CHESNAIS, Isabelle CROS, Jim CUMMINS, Delphine D'HONDT, Fanny DUREYSSEIX, Pierre ESCUDÉ, Laurent GAJO, Christophe HACHE, Martine JAUBERT, Emile JENNY, Emilie KASAZIAN, Emmanuelle LE PICHON-VORSTMAN, Jérémie MAUGEZ, Catherine MENDONÇA DIAS, Ismaïl MILI, Karine MILLON FAURÉ, Marianne MOULIN, Estelle MOUMIN, Florence PETEERS, Caroline POISARD, Maryse REBIÈRE, Avenilde ROMO VÁZQUEZ, Jean-Jacques SALONE, Élodie SURGET.Site de l'éditeur : https://www.lambert-lucas.com/livre/plurilinguisme-et-enseignement-des-mathematiques
Christophe Colomb, le caoutchouc et les tétines
No full textChristoph Kolumbus, Kautschuk und die Gummisauger.
Der Verfasser schildert kurz die Geschichte des Kautschuks und erwänt die apotheker welche daran beteiligt sind. Er legt anschliessend die Geschichte der Gummisauger und der Milchflaschen dar, deren eine der meistgängisten die « Robert'sche Milchflasche » gewesen ist.Christopher Columbus, rubber, and rubber nipples.
The author quickly traces the history of rubber, making note of the pharmacists who therein played a role. He exhibits the history of rubber nipples and that of infant bottles, of which one of the most widely used was the « Robert Bottle. »Labeÿ Robert. Christophe Colomb, le caoutchouc et les tétines. In: Revue d'histoire de la pharmacie, 82ᵉ année, n°300, 1994. pp. 55-63
The impact of the large scale structures of the Universe on dark matter halo and galaxy formation
No full textÀ grande échelle, la distribution anisotrope de la matière forme un large réseau de vides délimités par des murs qui, avec les filaments présents à leurs intersections, tissent la toile cosmique. La matière qui doit former plus tard les halos de matière noire et leurs galaxies afflue vers les nœuds compacts se situant à l’intersection des filaments et garde dans ce processus une empreinte de la toile cosmique. Dans cette thèse, je développe une extension contrainte de la théorie de l’excursion qui, à l'aide d'un modèle de filament, me permet de montrer que l'environnement anisotrope a un effet sur l'histoire de formation des halos de matière noire. La toile cosmique a donc un rôle dans la formation des halos et de leurs galaxies. Dans un second temps, je construis un modèle qui décrit l'évolution de la toile cosmique (fusion de halos, mais aussi de filaments et de murs) afin de mieux contraindre les modèles de formation de galaxies. Le modèle prédit un excès d'accrétion anisotrope dans les filaments par rapports aux nœuds, biaisant ainsi la formation des galaxies. L'effet de l'accrétion anisotrope sur la formation des galaxies est ensuite étudié à l'aide de simulations hydrodynamiques et d'une nouvelle méthode permettant le suivi précis de l'histoire d'accrétion du gaz. J'y montre que le moment angulaire est transporté efficacement des grandes échelles de la toile cosmique jusque dans les zones internes du halo, où les couples gravitationnels le redistribue au disque de la galaxies et au halo interne.The anisotropic large-scale distribution of matter is made of an extended network of voids delimited by sheets, with filaments at their intersection which together form the cosmic web. Matter that will later form dark matter halos and their galaxies flows towards compact nodes at filaments' intersections and in the process, retains the imprint of the cosmic web. In this thesis, I develop a conditional version of the excursion set theory which, using a model of a large-scale filament, enables me to show that anisotropic environment have an impact on the formation history of dark matter halos. The cosmic web then has a role in the formation of halos and their galaxies. I then build a model that is able to capture the evolution of the cosmic web (halo mergers, but also filament and wall mergers) that can be used to better constrain galaxy formation models. The model predicts that an excess of anisotropic accretion is expected in filaments compared to nodes, so that the formation history of galaxies is biased. The effect of anisotropic accretion on galaxy formation is then studied using hydrodynamical simulations and a novel numerical method tailored to accurately follow the accretion history of the gas. I show that the angular momentum is transported efficiently from the cosmic web down to the inner halo, where gravitational torques redistribute it to the disk and the inner halo
Identification of descriptors impacting the NH3-SCR selectivity in small pore zeolites
No full textL'objectif principal de cette thèse est de trouver des descripteurs capables de traduire la relation entre les performances catalytiques et les propriétés physico-chimiques des zéolithes à petits pores utilisées comme catalyseurs pour la réduction sélective des oxydes d’azote par l’ammoniac (NH3-SCR, une stratégie de réduction des émissions de NOx employée dans les moteurs à combustion interne en mélange pauvre). Une revue approfondie de la littérature a permis de conclure que les zéolithes à petits pores échangées au cuivre avec des porosités tridimensionnelles, de petits canaux reliés par des cages plus grandes et des unités de construction de type d6r étaient très performantes. Quatre structures zéolitiques ont été sélectionnées : AEI, CHA et AFX avec une connectivité 3D, et la PTT – une nouvelle structure 2D présentant les caractéristiques susmentionnées. Différents paramètres ont été étudiés et des corrélations ont été identifiées entre les performances catalytiques et les propriétés physico-chimiques des zéolithes. Plusieurs techniques de caractérisation ont été utilisées, fournissant des informations sur la composition chimique (AAS, ICP-OES, XRF, XPS), la morphologie et le réseau poreux (MEB, Physisorption d’azote), les propriétés structurales (27Al et 29Si MAS RMN, DRX) et la distribution des espèces actives de Cu (H2-RTP et NO-IR). Cinq axes de recherche ont été suivis : l'effet du rapport Si/Al sur les performances des zéolithes CHA ; l'effet de la teneur en cuivre sur les performances NH3-SCR des catalyseurs AEI, AFX et CHA ; l'effet du vieillissement hydrothermal sur les zéolithes AEI et CHA ; l'effet de la procédure de synthèse sur les performances des catalyseurs AFX et, enfin, l'effet de la dimensionnalité de la porosité (nature du réseau) sur les performances catalytiques. Plusieurs conclusions ont été obtenues : les zéolithes CHA avec des teneurs en cuivre similaires forment moins de N2O lorsque le rapport Si/Al diminue. De même, l'augmentation de la teneur en Cu sur une zéolithe AEI, AFX ou CHA conduit à une formation accrue de N2O. Également, il est montré que le vieillissement hydrothermal est propice à une diminution de la sélectivité en N2 dans les zéolithes AEI et CHA. Il apparait également que la procédure de synthèse des zéolithes AFX a une influence sur les caractéristiques résultantes du matériau et, donc, sur la sélectivité en N2. Enfin, et conformément aux résultats présents dans la bibliographie, pour des zéolithes ayant des rapports Si/Al et des teneurs en Cu similaires, une diminution de la dimensionnalité de la porosité de la charpente entraine une perte d'activité, et une augmentation de la formation de N2O. Les deux phénomènes résultent de la plus faible stabilité de la structure PTT.The main objective of this thesis is to find descriptors able to translate the relationship between the catalytic performance and the physicochemical properties of small pore zeolites used as catalysts in NH3-SCR – a depollution strategy employed in lean-burn engines for the purpose of reducing NOx emissions. A thorough consultation of the literature led to conclude that Cu-exchanged small pores zeolites with 3D channel dimensionality, small channels connected by larger cages, and d6r as composite building units were highly performant. Four different zeolitic structures were, then, selected: the AEI, CHA and AFX frameworks with a 3D connectivity, and the PTT framework – a novel zeolitic structure showcasing all the aforementioned features, but with a 2D connectivity. Different parameters have been studied, and conclusions were determined by correlating the catalytic performance to the physicochemical properties of the zeolites. An extensive array of characterization techniques was employed, providing information on the chemical composition (AAS, ICP-OES, XRF, XPS), the morphology and porous network (SEM, N2 physisorption), the structural properties (27Al and 29Si MAS NMR, XRD) and the distribution of the Cu active species (H2-TPR and NO-IR). Five research axes were followed: the effect of the Si/Al ratio on the deNOx performance of CHA zeolites; the effect of the Cu loading on the NH3-SCR performance of AEI, AFX and CHA catalysts; the effect of the hydrothermal aging on AEI and CHA zeolites; the effect of the synthesis procedure on the deNOx performance of AFX catalysts and, finally, the effect of the channel dimensionality on the NH3-SCR performance. Several conclusions were obtained: CHA zeolites with similar Cu loadings formed less N2O when the Si/Al ratio decreased. Similarly, for a given zeolite with the AEI, AFX and CHA frameworks, higher Cu loadings increased the formation of N2O. Hydrothermal aging was also conducive to a decrease of the N2 selectivity in AEI and CHA zeolites. Employing different structuring directing agents in the synthesis of AFX zeolites led to conclude that this parameter influenced the resulting characteristics of the material and, thus, the N2 selectivity. Finally, and in line with the previous literature, for zeolites with similar Si/Al ratios and Cu loadings, a decrease in the framework’s channel dimensionality resulted in a loss of activity and led to a higher formation of N2O in the PTT zeolite. Both phenomena resulted from the lower structural stability of the PTT framework
Christophe Defeuilley, L’Entrepreneur et le Prince. La création du service public de l’eau
No full textBehind Christophe Defeuilley’s poetic title lies a comparative historical analysis of the establishment of public drinking water services in London, New York, and Paris, the three most populous cities at the dawn of the 20th century. The author combines the lens of economics and a long-term perspective (from the 16th to the beginning of the 20th century) focused largely on private and public actors, to trace how water distribution systems evolved and crystalized into the form they still have ..
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