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Search Results: 1 - 10 of 3988 matches for " Bonnot Alain "
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Les Pseudoperisphinctinae (Ammonitina, Perisphinctidae) de l'horizon à Leckenbyi (Callovien supérieur, zone à Athleta) de Montreuil-Bellay (Maine-et-Loire, France) et description d'une nouvelle espèce, Choffatia isabellae [Pseudoperisphinctinae (Ammonitina, Perisphinctidae) from the Leckenbyi horizon (Upper Callovian, Athleta zone) of Montreuil-Bellay (Maine-et-Loire, France) and description of a new species, Choffatia isabellae]
Bonnot Alain,Boursicot Pierre-Yves,Ferchaud Patrice,Marchand Didier
Carnets de Géologie , 2008,
Abstract: Pseudoperisphinctinae (Ammonitina, Perisphinctidae) from the Leckenbyi horizon (Upper Callovian, Athleta zone) of Montreuil-Bellay (Maine-et-Loire, France) and description of a new species, Choffatia isabellae.- Many outcrops exposing the Mid-Callovian/Upper Callovian boundary have been found near Montreuil-Bellay (Maine-et-Loire). The lowermost bed of the Upper Callovian has been dated as the Leckenbyi horizon. It contains an abundant ammonite fauna (3125 specimens), in which Perisphinctidae make up just over half of the specimens. In company with reasonably well-known species such as Pseudopeltoceras leckenbyi (Bean), Orionoides pseudorion (Waagen), Subgrossouvria famulum (Bean) and S. crassa Gérard et Contaut, occurs a species, previously unknown, which is described in this article. Choffatia isabellae n. sp. differs markedly from contemporary Perisphinctidae, for it is distinguished by : 1) a long, smooth juvenile stage, 2) weakly developed ribbing, 3) the absence of parabolic ornamentation and 4) a high frequency of constrictions. As this species is unknown in the fauna of the uppermost Middle Callovian, along with many other species, including Peltoceras marysae Bonnot et alii, it must have colonised the northwestern part of the European platform via the southern margin of the Tethys during the transgressive interval which started at the beginning of the Late Callovian. This new species appears abruptly at the base of the Leckenbyi horizon, reaches its acme in the middle of the horizon, where it probably represents half of the Perisphinctidae, before becoming rare in the upper part of the horizon, then very rare in the Athleta horizon.
La faune ammonitique des marnes à fossiles ferrugineux de la région de Niort, France (Oxfordien inférieur, Zone à Cordatum, Sous-Zone à Cordatum) [The ammonite fauna of the 'marls with ferruginous fossils' from the Niort region, France (Lower Oxfordian, Cordatum Zone, Cordatum Subzone)]
Quereilhac Philippe,Marchand Didier,Jardat Rémi,Bonnot Alain
Carnets de Géologie , 2009,
Abstract: A new collection of ammonites from the 'marls with ferruginous ammonites' in the Niort region (France), previously studied by Grossouvre (1922), provides a large amount of biostratigraphic, paleoenvironmental and paleogeographic information. The fauna is dated Early Oxfordian: Cordatum Zone, Cordatum Subzone, probably the lower part of it. In addition, it is unique in western Europe owing to: 1) the species found of which some appear to be known only in this deposit 2) by the extremely atypical domination of the couple Taramelliceras - Creniceras which represent 2/3 of the specimens. Furthermore, the aspect of the fauna strongly suggests that the habitat was a distal platform unknown in other European strata of the same age. A detailed description of the several species is given, sometimes accompanied by a new taxonomic interpretation.
Les maquettes de Lucien Mothu.
Thierry Bonnot
EspacesTemps.net , 2006,
Abstract: En 2002, l’écomusée du Creusot-Montceau s’est vu proposer l’acquisition d’un ensemble important, composé de trois maquettes de locomotives à vapeur au 1/14 e (soit des machines de près de deux mètres de longueur, et de plus de 100 kilos) uvres de Lucien Mothu, décédé en avril 2000 à l’age de 90 ans. Ces objets nécessitèrent des milliers d’heures de travail et l’investissement passionné d’un homme dans la réalisation méticuleuse d’un véritable trésor technique . La description des phases successives du processus de don nous fait saisir ce qui se passe autour des objets, et aussi ce qui se passe pour les objets donnés : car le don d’un objet ou d’un ensemble d’objets à un musée ne se limite pas à la signature d’une convention, mais c’est d’abord une interaction faite de plusieurs moments, qui implique des échanges, des discours, des pratiques techniques, des manipulations conditionnant le passage de l’objet en cause de la sphère individuelle à la collection publique. Comment fut légitimée l’entrée de ces objets dans un espace collectif public, alors même qu’ils étaient tellement imprégnés du destin d’un individu et de sa famille, et dans un musée de territoire — celui du Creusot et de Montceau-les-Mines — alors que le maquettiste vivait au Havre après avoir commencé la réalisation de ses machines en Algérie dès les années 1930 ? Qu’est-ce qui fait que les proches d’un défunt, convaincus de son génie créatif et technique, affectivement attachés à son souvenir et aux objets de sa passion, non seulement acceptent de s’en séparer, mais provoquent eux-mêmes la rencontre aboutissant au don ? La biographie de ces objets, indissociable de celle de leur créateur et de sa famille marquée de fa on indélébile par la passion dévorante de Lucien Mothu, devra nous permettre de comprendre ce qui a fait que les donateurs ont voulu donner, et quelle légitimation le donataire a échafaudé pour la mise en patrimoine d’un héritage familial. In 2002, the Ecomusée of Le Creusot-Montceau acquired an important set, composed of three models of steam locomotives on the scale of 1 to 14 (that is to say engines of almost two meters long weighing more than 100 kilograms), which were the works of Lucien Mothu, a 90 years old man who died on April 2000. These objects needed thousands hours of work and all the passion of their creator for the meticulous achievement of a real “technical treasure”. The description of the successive steps of the donation process allows us to understand what happens around the objects, and also what happen for the objects: because to donate an object or a
Hydrogen bonding to the cysteine ligand of superoxide reductase: acid--base control of the reaction intermediates
Emilie Tremey,Florence Bonnot,Yohann Moreau,Catherine Berthomieu,Alain Desbois,Vincent Favaudon,Geneviève Blondin,Chantal Houée-Levin,Vincent Nivière
Quantitative Biology , 2015, DOI: 10.1007/s00775-013-1025-1
Abstract: Superoxide reductase SOR is a non-heme iron metalloenzyme that detoxifies superoxide radical in microorganisms. Its active site consists of an unusual non-heme Fe2+ center in a [His4 Cys1] square pyramidal pentacoordination, with the axial cysteine ligand proposed to be an essential feature in catalysis. Two NH peptide groups from isoleucine 118 and histidine 119 establish H-bondings with the sulfur ligand (Desulfoarculus baarsii SOR numbering). In order to investigate the catalytic role of these H-bonds, the isoleucine 118 residue of the SOR from Desulfoarculus baarsii was mutated into alanine, aspartate or serine residues. Resonance Raman spectroscopy showed that the mutations specifically induced an increase of the strength of the Fe3+-S(Cys) and S-C$\beta$(Cys) bonds as well as a change in conformation of the cysteinyl side chain, which was associated with the alteration of the NH hydrogen bonding to the sulfur ligand. The effects of the isoleucine mutations on the reactivity of SOR with $O2\bullet$- were investigated by pulse radiolysis. These studies showed that the mutations induced a specific increase of the pKa of the first reaction intermediate, recently proposed to be an $Fe2+-O2\bullet-$ species. These data were supported by DFT calculations carried out on three models of the $Fe2+-O2\bullet-$ intermediate, with one, two or no H-bonds on the sulfur ligand. Our results demonstrated that the hydrogen bonds between the NH (peptide) and the cysteine ligand tightly control the rate of protonation of the $Fe2+-O2\bullet-$ reaction intermediate to form an Fe3+-OOH species.
Geometrization of postcritically finite branched coverings
Sylvain Bonnot,Michael Yampolsky
Mathematics , 2010,
Abstract: We study canonical decompositions of postcritically finite branched coverings of the 2-sphere, as defined by K.~Pilgrim. We show that every hyperbolic cycle in the decomposition does not have a Thurston obstruction. It is thus Thurston equivalent to a rational map.
Geometrization of postcritically finite branched coverings (revised)
Sylvain Bonnot,Michael Yampolsky
Mathematics , 2011,
Abstract: We study canonical decompositions of postcritically finite branched coverings of the 2-sphere, as defined by K. Pilgrim. We show that every hyperbolic cycle in the decomposition does not have a Thurston obstruction. It is thus Thurston equivalent to a rational map.
A presentation for the baseleaf preserving mapping class group of the punctured solenoid
S. Bonnot,R. C. Penner,D. Saric
Mathematics , 2006, DOI: 10.2140/agt.2007.7.1171
Abstract: We give a presentation for the baseleaf preserving mapping class group $Mod(\S)$ of the punctured solenoid $\S$. The generators for our presentation were introduced previously, and several relations among them were derived. In addition, we show that $Mod(\S)$ has no non-trivial central elements. Our main tool is a new complex of triangulations of the disk upon which $Mod(\S)$ acts.
Thurston equivalence to a rational map is decidable
Sylvain Bonnot,Mark Braverman,Michael Yampolsky
Mathematics , 2010,
Abstract: We demonstrate that the question whether or not a given postcritically finite topological ramified covering map of the 2-sphere is Thurston equivalent to a rational map is algorithmically decidable.
Carnot Factor of a Vapour Power Cycle with Regenerative Extraction  [PDF]
Duparquet Alain
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.811107
Abstract: The present paper describes the energy analysis of a regenerative vapour power system. The regenerative steam turbines based on the Rankine cycle and comprised of vapour extractions have been used industrially since the beginning of the 20th century, particularly regarding the processes of electrical production. After having performed worked in the first stages of the turbine, part of the vapour is directed toward a regenerative exchanger and heats feedwater coming from the condenser. This process is known as regeneration, and the heat exchanger where the heat is transferred from steam is called a regenerator (or a feedwater heater). The profit in the output brought by regenerative rakings is primarily enabled by the lack of exchange of the tapped vapour reheating water with the low-temperature reservoir. The economic optimum is often fixed at seven extractions. One knows the Carnot relation, which is the best possible theoretical yield of a dual-temperature cycle; in a Carnot cycle, one makes the assumption that both compressions and expansions are isentropic. This article studies an ideal theoretical machine comprised of vapour extractions in which each cycle partial of tapped vapour obeys these same compressions and isentropic expansions.
Essay on Playfulness and Play in Children’s Art Class: A Reflection Based on Winnicott  [PDF]
Alain Savoie
Creative Education (CE) , 2019, DOI: 10.4236/ce.2019.102024
Abstract: From a survey of literature, this article presents some reflections about the value of play and playfulness as, respectively, an activity and a creative attitude of mind to be fostered in art education in children. Indeed, at the heart of any artistic creative impulse sits a playful attitude of the artist towards realitya feature that has been highlighted by the psychoanalyst Winnicott. Following his line of thought, we propose that the art teacher must place the learner in a position of being able to play with her/him, in order to overlap their two areas of playing and establish a learning space. Playfulness and play tend to be confused with impulsive and disruptive behaviours and generally more tolerated at home then school. We claim that artistic activities in school should always be play-based and take place in a playful environment because art and creation emerge from and grow in and as play.
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