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Search Results: 1 - 10 of 191807 matches for " D. Durand "
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Production of complex particles in low energy spallation and in fragmentation reactions by in-medium random clusterization
D. Lacroix,D. Durand
Physics , 2005,
Abstract: Rules for in-medium complex particle production in nuclear reactions are proposed. These rules have been implemented in two models to simulate nucleon-nucleus and nucleus-nucleus reactions around the Fermi energy. Our work emphasizes the effect of randomness in cluster formation, the importance of the nucleonic Fermi motion as well as the role of conservation laws. The concepts of total available phase-space and explored phase-space under constraint imposed by the reaction are clarified. The compatibility of experimental observations with a random clusterization is illustrated in a schematic scenario of a proton-nucleus collision. The role of randomness under constraint is also illustrated in the nucleus-nucleus case.
Headhunting and Colonialism. Anthropology and the Circulation of Human Skulls in the Portuguese Empire, 1870-1930, Ricardo Roque
Frédéric Durand
Moussons : Recherche en Sciences Humaines sur l’Asie du Sud-Est , 2011,
Abstract: Le livre de Ricardo Roque sur la chasse aux têtes et le colonialisme dans l’empire portugais est tiré d’une thèse de doctorat soutenue à l’université de Cambridge en 2007. Bien que son titre laisse envisager une aire d’extension large, son propos se limite en réalité essentiellement à des éléments et événements liés à la colonisation de la partie orientale de l’ le de Timor, située entre l’Indonésie et l’Australie. Les Portugais y ont mené des activités commerciales et religieuses à partir de...
Modelisation et optimisation de la trempe de contour des pièces dentées
M Kchaou, D Durand, D Coupard
African Journal of Science and Technology , 2003,
Abstract: RéSUMé:- En général, les mécaniciens mettent en uvre, pour assurer la fiabilité et la pérennité, des machines qu'ils con oivent. Et pourtant, des défauts (déformation, fissures et irrégularité des profondeurs trempées) surviennent, tant t de fa on aléatoire, tant t de fa on répétée. Après avoir traité la trempe superficielle par induction des pièces de géométries simples (cylindriques) [1], nous proposons donc de traiter la trempe de contour des pièces dentées de type engrenages, roues dentées, …, et plus précisément le profil des dents d'une roue dentées. Dans cet article nous présenterons une approche intéressante basée sur la recherche d'une fréquence optimale du générateur. Nous faisons appel à trois techniques variées : Trempe de contour mono fréquence, Trempe bi-fréquences et Trempe bi-fréquences bi-couches pour en choisir la meilleure description du contour trempé. le choix définitif de la technique sera confirmé, à la fin de ce travail, par une simulation et traitement d'un pignon. Mots clés : Chauffage inductif, Trempe de contour, fréquence optimale, engrenage. ABSTRACT:- In general, mechanics put in work to assure reliability and the everlastingness of machines that they conceive. And yet, of defaults (distortion, cracks and irregularity of quenched depths) occur, soon of uncertain way, soon of repeated way. After have treated the superficial quench by induction of the simple geometry pieces (cylindrical) [1], we propose to treat the quenching contour of toothed pieces type gearings, toothed wheels, therefore…, more precisely the profile of teeth of a wheel. In this paper we will present an approach interesting based on the research of an optimal frequency of the generator. We make call to three varied techniques: Quenching of contour mono frequency, Quenching bi-frequency and Quenching bi-frequency bilies to choose the best description of the contour quenched. Key Words: Inductive heating, Quenching of contour, optimal frequency, gearing African Journal of Science and Technology Vol.4(2) 2003:95-104
Characterization of quasi-projectiles produced in symmetric collisions studied with INDRA. Comparison with models
Legouée E.,Vient E.,Durand D.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123100007
Abstract: The characterization of hot quasi-projectiles produced in symmetric or quasi-symmetric reactions (Au + Au, Xe + Sn, Ni + Ni, Ar + KCl) at different incident energies are estimated by means of two different procedures. The advantages and disadvantages of each method are analyzed on the basis of simulations using events produced by two slightly different models: HIPSE and ELIE.
A study of stopping power in nuclear reactions at intermediate energies
G. Lehaut,D. Durand,O. Lopez
Physics , 2010,
Abstract: We show a systematic experimental study based on INDRA data of the stopping power in central symmetric nuclear reactions. Total mass of the systems goes from 80 to 400 nucleons while the incident energy range is from 12 AMeV to 100 AMeV. The role of isospin diffusion at 32 and 45 MeV/nucleon with 124,136Xe projectiles on 112,124Sn targets performed at GANIL is also discussed. Results suggest a strong memory of the entrance channel above 20 AMeV/A (nuclear transparency) and, as such, constitute valuable tests of the microscopic transport models.
Multifragmentation in central collisions at intermediate energies: a fast process?
A. Van Lauwe,D. Durand et al
Physics , 2002,
Abstract: The kinematical characteristics of fragments and light particles observed in central highly fragmented nuclear collisions at intermediate energies are compared with the results of a model assuming that the initial momentum distribution of the nucleons inside the two partners of the reaction has no time to relax before the disassembly of the system. The rather good agreement between the results of the model and the experimental data suggests that multifragmentation is a fast process with a strong memory of the entrance channel.
Minimal polynomial dynamics on the set of 3-adic integers
Fabien Durand,Frédéric Paccaut
Mathematics , 2012, DOI: 10.1112/blms/bdp003
Abstract: In this paper are characterized the polynomials, in terms of their coefficients, that have all their orbits dense in the set of 3-adic integers.
Benchmarking GEANT4 nuclear models for hadron therapy with 95 MeV/nucleon carbon ions
J. Dudouet,D. Cussol,D. Durand,M. Labalme
Physics , 2013, DOI: 10.1103/PhysRevC.89.054616
Abstract: In carbon-therapy, the interaction of the incoming beam with human tissues may lead to the production of a large amount of nuclear fragments and secondary light particles. An accurate estimation of the biological dose deposited into the tumor and the surrounding healthy tissues thus requires sophisticated simulation tools based on nuclear reaction models. The validity of such models requires intensive comparisons with as many sets of experimental data as possible. Up to now, a rather limited set of double di erential carbon fragmentation cross sections have been measured in the energy range used in hadrontherapy (up to 400 MeV/A). However, new data have been recently obtained at intermediate energy (95 MeV/A). The aim of this work is to compare the reaction models embedded in the GEANT4 Monte Carlo toolkit with these new data. The strengths and weaknesses of each tested model, i.e. G4BinaryLightIonReaction, G4QMDReaction and INCL++, coupled to two di fferent de-excitation models, i.e. the generalized evaporation model and the Fermi break-up are discussed.
Les élections présidentielles de 2007 à Timor Leste
Christine Cabasset-Semedo,Frédéric Durand
EchoGéo , 2007,
Abstract: En avril-mai 2007 des élections présidentielles se sont tenues à Timor-Est. Ce pays, indépendant depuis mai 2002, a connu une série de crises au cours des dernières années, qui a abouti à une remise en question du r le dominant du Fretilin, le parti historique de la lutte contre l'invasion indonésienne et pour l'indépendance, au pouvoir depuis 2002. Le premier tour a été serré avec trois candidats entre 19 et 28%. Au deuxième tour, qui opposait Lu-Olo, candidat du Fretilin à José Ramos Horta, ancien Premier ministre, co-lauréat du Prix Nobel de la Paix, c'est ce dernier qui a finalement été élu avec 69 % des suffrages. Les élections législatives qui se sont tenues le mois suivant, en juin, ont confirmé l'affaiblissement du Fretilin et le rééquilibrage politique. In April-May 2007 presidential elections were held in East-Timor. Since independence (2002), the country crossed several crisis, calling into question the leading role of the Fretilin, the historical party which fought against Indonesia invasion and for independance. The first round of the ballot was tight with three candidates between 19 and 28%. At the end of the second round, opposing Lu-Olo, Fretilin's candidate to José Ramos Horta, former Prime minister, co-Nobel Peace Laureate in 1996, this last has been elected with 69% of the votes. The legislative elections which were held the following month, in June, confirmed the Fretilin weakening and the political rebalancing. Em abril-maio de 2007 havia elei es presidenciais em Timor Leste. Independente desde maio de 2002, o país conheceu uma série de crises no decorrer destes últimos anos, que acabaram por abalar o papel dominante da Fretilin, partido histórico da luta contra a invas o indonésia e pela independência. A primeira volta foi apertada, com três candidatos obtendo entre 19 e 28% dos votos. Na segunda volta, que opunha Lu-Olo, candidato do Fretilin, a José Ramos Horta, ex-Primeiro ministro, co-laureado do Prémio Nobel da Paz, este ùltimo acabou por ser eleito com 69% dos votos. As elei es legislativas que se realizaram no mês seguinte, em Junho, confirmaram o enfraquecimento da Fretilin e o reequilíbrio político.
Dynamical and thermodynamical features in the fragmentation process
J.P. Wieleczko,R. Bougault,A. Chbihi,D. Durand
Revista mexicana de física , 2006,
Abstract: Se discuten propiedades dinámicas y termodinámicas del proceso de fragmentación cerca de la energía de Fermi con datos experimentales obtenidos en GANIL y GSI con el arreglo 4 INDRA. Se estudian las propiedades de transporte y fenómenos transitorios in colisiones centrales y periféricas y se presenta un panorama de la física de sistemas transitorios producidos en colisiones de iones pesados.
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