oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 16 )

2018 ( 19 )

2017 ( 13 )

2016 ( 22 )

Custom range...

Search Results: 1 - 10 of 9333 matches for " Clément Gombeaud "
All listed articles are free for downloading (OA Articles)
Page 1 /9333
Display every page Item
Are eccentricity fluctuations able to explain the centrality dependence of $v_4$?
Clément Gombeaud,Jean-Yves Ollitrault
Physics , 2009, DOI: 10.1088/0954-3899/37/9/094024
Abstract: The fourth harmonic of the azimuthal distribution of particles $v_4$ has been measured for Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC). The centrality dependence of $v_4$ does not agree with the prediction from hydrodynamics. In particular, the ratio $v_4/(v_2)^2$, where $v_2$ denotes the second harmonic of the azimuthal distribution of particles, is significantly larger than predicted by hydrodynamics. We argue that this discrepancy is mostly due to elliptic flow ($v_2$) fluctuations. We evaluate these fluctuations on the basis of a Monte Carlo Glauber calculation. The effect of deviations from local thermal equilibrium is also studied, but appears to be only a small correction. Combining these two effects allows us to reproduce experimental data for peripheral and midcentral collisions. However, we are unable to explain the large magnitude of $v_4/(v_2)^2$ observed for the most central collisions.
Why is $v_4/(v_2)^2$ larger than predicted by hydrodynamics?
Clément Gombeaud,Jean-Yves Ollitrault
Physics , 2009, DOI: 10.1016/j.nuclphysa.2010.01.002
Abstract: The second and fourth Fourier harmonics of the azimuthal distribution of particles, $v_2$ and $v_4$, have been mesured in Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC). The ratio $v_4/(v_2)^2$ is significantly larger than predicted by hydrodynamics. Effects of partial thermalization are estimated on the basis of a transport calculation, and are shown to increase the ratio by a small amount. We argue that the large value of $v_4/(v_2)^2$ seen experimentally is mostly due to elliptic flow fluctuations. However, the standard model of eccentricity fluctuations is unable to explain the large magnitude of $v_4/(v_2)^2$ in central collisions.
Effects of partial thermalization on HBT interferometry
Clément Gombeaud,Tuomas Lappi,Jean-Yves Ollitrault
Physics , 2009, DOI: 10.1016/j.nuclphysa.2009.10.075
Abstract: Hydrodynamical models have generally failed to describe interferometry radii measured at RHIC. In order to investigate this ``HBT puzzle'', we carry out a systematic study of HBT radii in ultrarelativistic heavy-ion collisions within a two-dimensional transport model. We compute the transverse radii $R_o$ and $R_s$ as functions of $p_t$ for various values of the Knudsen number, which measures the degree of thermalization in the system. For realistic values of the Knudsen number estimated from $v_2$ data, we obtain $R_o/R_s \simeq 1.2$, much closer to data than standard hydrodynamical results. Femtoscopic observables vary little with the degree of thermalization. Azimuthal oscillations of the radii in non central collisions do not provide a good probe of thermalization.
v4 from ideal and viscous hydrodynamic simulations of nuclear collisions at the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC)
Matthew Luzum,Clément Gombeaud,Jean-Yves Ollitrault
Physics , 2010, DOI: 10.1103/PhysRevC.81.054910
Abstract: We compute v4/(v2)^2 in ideal and viscous hydrodynamics. We investigate its sensitivity to details of the hydrodynamic model and compare the results to experimental data from RHIC. Whereas v2 has a significant sensitivity only to initial eccentricity and viscosity while being insensitive to freeze out temperature, we find that v4/(v2)^2 is quite insensitive to initial eccentricity. On the other hand, it can still be sensitive to shear viscosity in addition to freeze out temperature, although viscous effects do not universally increase v4/(v2)^2 as originally predicted. Consistent with data, we find no dependence on particle species. We also make a prediction for v4/(v2)^2 in heavy ion collisions at the LHC.
Brunetto Latini y la reconstrucción del ethos republicano
Clément Godbarge
Foro Interno : Anuario de Teoría Política , 2005,
Abstract: influenced by the consolidation of the autonomous political sphere of the city. The gradual opening of power to a large spectrum of citizens led to a change in the daily practice of politics. The Florentine bourgeoisie, as a source of an unprecedented economic growth, brought new rules to the political game and sought to legitimate them before the leading European political actors. Brunetto Latini took part in this process by providing a theoretical corpus to the fragile Florentine republic, thus setting the... (Ver más) ethical and practical bases of the vivere civile. His encyclopaedic work is nurtured from the many intellectual traditions with which he was in contact, and demonstrates an unusual interest in the ancient thinkers. He wrote in romance languages and is known to be the first to popularize Aristotle’s Nicomaquean Ethics and Cicero’s De Inventione. The Florentine memory remembers him as the master of a whole generation. Among his students, we may highlight Dante Alighieri, who dedicated a Canto from the Inferno to his master.
Sciences de l'esprit et sciences sociales : des liaisons dangereuses ?
Fabrice Clément
SociologieS , 2012,
Abstract: Après avoir insisté sur les apports d'une approche naturaliste pour les sciences sociales, cet article vise tout d'abord à montrer que les éventuels risques de réductionnisme dont sont soup onnés les sociologues cognitifs ne s'appliquent en rien à l'article de Laurence Kaufmann et Laurent Cordonier. Par contre, s'il est aujourd'hui nécessaire d'envisager une forme de compatibilisme entre les sciences de l'esprit et les sciences sociales, il faut convenir que certaines caractéristiques de ces dernières ne se prêtent pas facilement à une méthodologie strictement expérimentale. D'une part, les sciences sociales ont un r le de lecture des réalités socio-politiques qui ne donne pas vraiment prise aux méthodes des sciences dites dures . D'autre part, les réductions opérées en laboratoire doivent être complétées par des observations de terrain. Enfin, les descriptions des formes de vie humaines ne peuvent être strictement objectivantes : comme l'a bien montré Jeanne Favret-Saada, ce n'est qu'en acceptant d'être affecté à la première personne que l'anthropologue a une chance de comprendre ce que a fait d'être Bororo ou victime d'une attaque de sorcellerie. Towards a compatibilism between cognitive and social sciencesThe first objective of this paper is to shed light on the advantages of a naturalistic approach for social sciences and to show that Laurence Kaufmann and Laurent Cordonier cannot be accused of reductionism. However, if a form of compatibilism between social and cognitive sciences is necessary, there are certain characteristics of social sciences that cannot be tackled by a strict experimental approach. On the one hand, the role of the social sciences is to give meaning to complex historical realities that cannot be enclosed in a laboratory. One the other hand, experimental results have to be completed with field observations. And last but not least, understanding human forms of life involves an existential involvement from the observer who cannot reduce what s/he is studying to a mere object of inquiry. To understand what it is like to be a Bororo or a bewitched, the scientist has to be personally affected by the form of life s/he is studying. Neurociencias y ciencias sociales: lazos peligrosos?El objetivo principal de este artículo es el de subrayar las ventajas de una aproximación naturalista en las ciencias sociales y de indicar que Laurence Kaufmann y Laurent Cordier no pueden ser acusados de naturalistas. Pero aunque sea necesario contabilizar las relaciones entre las neurociencias y las ciencias sociales h
Quelques Armes Espagnoles au Musée d'Art et d'Histoire de Genève
Bosson, Clément
Gladius , 1969, DOI: 10.3989/gladius.1969.172
Abstract: LA collection des armes et armures du Musée d'Art et d'Histoire de Genève provient de l'ancien arsenal de la République. Cette collection est donc composée surtout de pièces qui avaient été utilisées par les soldats des corps de troupe de Genève et des officiers de la République et par les dépouilles des adversaires de la Cité. Les armuriers allemands -et particulièrement italiens- étaient les fournisseurs de l'Etat par l'intermédiaire de marchands établis en ville. C'est la raison pour laquelle les armes construites en Espagne sont peu nombreuses dans ce musée.
Architecture du paysage en Extrême-Orient
Pierre CLéMENT
Mappemonde , 1987,
Abstract: L'art d'implanter les constructions dans le paysage est apparu en Chine il y a plus de vingt siècles. Fondé sur l'observation des éléments naturels — relief, montagnes et eaux, orientations, vents — il les réinterprète dans un système de correspondance entre l'univers et l'homme, la nature et l'espace habité, cherchant ainsi à déterminer les sites les plus favorables à chaque individu et à chaque projet. Il a permis le développement de nombreuses écoles, la publication de nombreux traités fondés sur l'observation et la représentation des sites.
La Revue blanche et les Nabis. Une esthétique de la fragmentation
Clément Dessy
Trans : Revue de Littérature Générale et Comparée , 2009,
Abstract: Dès ses débuts, La Revue blanche (1889-1903) a manifesté son soutien aux peintres nabis. De nombreux textes brefs, en prose, sous forme de fragments textuels, sont publiés par la revue durant ses premières années. Ces fragments répondent de manière cohérente aux préceptes picturaux des Nabis et aux gravures que ces peintres livrent à La Revue blanche. Il s’établit de la sorte un dialogue neuf entre peinture et littérature à la fin du XIXe siècle. From its beginning, La Revue blanche (1889-1903) has been supporting the Nabis painters. The magazine published many short prosaic texts (as textual “fragments”) during its first years of existence. These fragments fit coherently to the Nabis’ painting principles and to the engravings published by the Nabis in La Revue blanche. This created a new relationship between painting and literature in the end of the nineteenth century. Desde el inicio, La Revue blanche (1889-1903) manifestó su apoyo a los pintores nabis. Numerosos son los textos breves, en prosa o en forma de "fragmentos" textuales, que fueron publicados por la revista en sus primeros a os. Estos fragmentos siguen de manera coherente los preceptos pictóricos de los Nabis, al acompa ar perfectamente los grabados que estos pintores entregan a La Revue blanche. De este modo se establece a finales del siglo XIX un diálogo novedoso entre pintura y literatura.
A newspaper account in Eudora Welty’s “The Demonstrators”
Clément Massé
Transatlantica : Revue d'études Américaines , 2010,
Abstract: Towards the end of Eudora Welty’s “The Demonstrators”, the reader comes across a newspaper article which offers an account of the double murder that happened over the weekend in Holden, Mississippi, where the story takes place. Ruby Gaddy, a maid, was stabbed with an ice pick as she was leaving a church gathering and apparently had the time to stab back her assailant, a man named Dove Collins. In the story, Richard Strickland, Holden’s doctor, is asked to come and heal the girl’s wound. A few...
Page 1 /9333
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.