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Search Results: 1 - 10 of 496867 matches for " Andréa RANDO-MARTIN "
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Studii si Cercetari Filologice : Seria Limbi Romanice , 2012,
Abstract: Les arts rhétoriques antiques, qui servent de fondement à la tradition médiévale, affirment l’impossibilité de représenter les êtres hybrides, marqués par une contradiction essentielle et une profonde laideur. Pourtant l’examen des portraits consacrés par le Roman de Perceforest à trois figures d’hybrides permet de déterminer les conditions et les limites de cette représentation. Il s’agit ici d’observer la manière dont le roman médiéval négocie l’impasse de la rhétorique antique et donne, dans le texte, sens et existence au corps hybride.
Development of practical soft X-ray imaging spectrometers
G. Brammertz,P. Verhoeve,A. Peacock,D. Martin,N. Rando,R. den Hartog,D. J. Goldie
Physics , 2001,
Abstract: Cryogenic soft X-ray imaging spectrometers are currently being developed for applications in the fields of Astronomy and material sciences. In this paper we present experiments on optimized single devices, which show measured energy resolutions of 4.6 eV at 525 eV, 8.1 eV at 1.5 keV and 20.5 eV at 6 keV respectively. These energy resolutions combined with a quantum efficiency of more than 40 % in the energy range from 0.5 to 2 keV together with a count rate capability of 15 kHz demonstrate the overall good performance of single Superconducting Tunnel Junctions (STJs). Assembling these optimized single devices in a matrix read-out would provide the practical basis for a soft X-ray imaging spectrometer.
Magnetic reversal modes in multisegmented nanowire arrays with long aspect ratio
E. A. Rando,S. Allende
Physics , 2015, DOI: 10.1063/1.4926377
Abstract: A detailed numerical analysis of the magnetization reversal processes in multisegmented nanowire arrays was developed. The nanowires have a long aspect ratio and are formed by magnetic and non-magnetic sections alternately arranged in such a way that the array resembles magnetic layers separated by non-magnetic layers. Attention has been focused on the influence of magnetostatic interaction in the magnetic pattern formation of these magnetic nanostructures. Results from a magnetic correlation function among layers show that three different reversal modes can be detected depending on the number and distance between the magnetic segments. As a consequence of the different reversal modes, a non-monotonic behavior of the annihilation field in function of the distance between the layers is evidenced. Thus, these results are important for the production of magnetic devices with multisegmented nanowire arrays.
Maintenance of order in a moving strong condensate
Justin Whitehouse,André Costa,Richard A Blythe,Martin R Evans
Statistics , 2014, DOI: 10.1088/1742-5468/2014/11/P11029
Abstract: We investigate the conditions under which a moving condensate may exist in a driven mass transport system. Our paradigm is a minimal mass transport model in which $n-1$ particles move simultaneously from a site containing $n>1$ particles to the neighbouring site in a preferred direction. In the spirit of a Zero-Range process the rate $u(n)$ of this move depends only on the occupation of the departure site. We study a hopping rate $u(n) = 1 + b/n^\alpha$ numerically and find a moving strong condensate phase for $b > b_c(\alpha)$ for all $\alpha >0$. This phase is characterised by a condensate that moves through the system and comprises a fraction of the system's mass that tends to unity. The mass lost by the condensate as it moves is constantly replenished from the trailing tail of low occupancy sites that collectively comprise a vanishing fraction of the mass. We formulate an approximate analytical treatment of the model that allows a reasonable estimate of $b_c(\alpha)$ to be obtained. We show numerically (for $\alpha=1$) that the transition is of mixed order, exhibiting exhibiting a discontinuity in the order parameter as well as a diverging length scale as $b\searrow b_c$.
Organization of the lithic production and use-wear analysis from Middle Paleolithic site of Abric Romaní. Level Ja (Capellades, Barcelona, Spain)
Martínez, Kenneth,Rando, José María
Trabajos de Prehistoria , 2001,
Abstract: The fieldwork from layer Ja at Abric Romaní provides some interesting insights on the examination of patterns of late premodern hominid behavior The reconstruction of chaine opératoire and use-wear analysis point out planning in the consumption of raw materials and in the design of stone tools for specific tasks. The archaeological record shows complexity in the settlement system and intrasite context, likewise, the land use depends mainly on the curation of tools through transport of cores, like reserve of tools, and retouched tools. The flakes were versatile tools; working wood, hide and participating in butchering activities and denticulates were used mainly on wood, probably to make points. So far, this work seeks to understand Middle Paleolithic way of life in its own right without comparing it with a hypothetical model of modern behavior. La intervención arqueológica del nivel Ja del Abric Romaní ha aportado una información muy valiosa para comprender los patrones conductuales de los últimos homínidos arcaicos. La reconstrucción de la organización de la producción lítica y los análisis funcionales indican una planificación a la hora de gestionar la materia prima y en el dise o de los útiles según tareas específicas. El registro arqueológico muestra una estructuración compleja de las ocupaciones en el interior del abrigo, así como una organización a escala regional de las ocupaciones. La explotación del entorno dependía principalmente de una gestión cuidada de la materia prima mediante el desplazamiento por el territorio de núcleos, como reserva de útiles, y de objetos retocados. Las lascas fueron útiles versátiles, trabajaron tanto madera como piel, y también participaron en actividades de carnicería. Por su parte, los denticulados fueron utilizados para trabajar madera, probablemente para elaborar puntas en este material. Por tanto, el presente artículo intenta comprender el modo de vida de las comunidades de neandertales sin compararlo con hipotéticos modelos conductuales de los homínidos modernos.
Persistent infection in root-filled tooth: an SEM morphological analysis after apical microsurgery
Rina Andréa Pelegrine,Carlos Eduardo Fontana,André Antonio Pelegrine,Alexandre Sigrist De Martin
RSBO , 2012,
Abstract: Introduction and Objective: Endodontic failure can be associated to well-conducted treatments due to microbial factors characterized by intra or extraradicular infections not eliminated during endodontic treatment. Case report: This report describes a case of persistent apical periodontitis of an asymptomatic maxillary lateral incisor endodontically retreated and subsequently subject to apical surgery. Conclusion: After SEM morphological analysis of the apical fragment, areas of cementum-dentin resorption that were probably responsible for the perpetuation of the disease process were observed.
Carbohydrates, Growth and Production of “Roxo de Valinhos” Fig Tree in Initial Development under Irrigation Management  [PDF]
Manoel Euzébio de Souza, Sarita Leonel, Andréa Carvalho da Silva, Adilson Pacheco de Souza, Rafaela Lopes Martin, Adriana Aki Tanaka
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.68117
Abstract: The carbohydrates translocation and consequently growth and production of fig tree (Ficuscarica L.) vary according to the different management on cultivation conditions. The aim of this study was to evaluate the changes in the levels and total carbohydrates accumulation together with growth and “Roxo de Valinhos” fig trees production onimplementation of orchards in initial phase, cultivated with and without irrigation. We adopted a factorial arrangement (2 x 7) with four repetitions distributed in installments (with and without irrigation) subdivided in time (collect time). Destructive analyzes were performed at 40, 80, 120, 160, 200, 240 and 280 days after pruning (DAP) and are measured: stem diameter and branch, stem length and branch, number of leaves, internodes and fruit. Subsequently, the plant parts were sectioned to obtain the leaf area, length and roots volume, fresh and dry matter weight. The number, weight and total productivity of fruits were evaluated. The media of all growth attributes and production characteristics were higher in treatments with water irrigation. The total carbohydrate content was higher at 120 and 160 DAP and the carbohydrates accumulation was increasing for most institutions over the plants development, except for the leaves that showed a decrease in the levels at 160 DAP. The fruits showed greater carbohydrates accumulation in relation to the other evaluated organs.
The Froissart bound for inelastic cross-sections
André Martin
Physics , 2009, DOI: 10.1103/PhysRevD.80.065013
Abstract: We prove that while the total cross{}-section is bounded by $(\pi/m_\pi^2) \ln^2 s$, where $s$ is the square of the c.m. energy and $m_\pi$ the mass of the pion, the total inelastic cross{}-section is bounded by $(1/4)(\pi/m_\pi^2) \ln^2 s$, which is 4 times smaller. We discuss the implications of this result on the total cross{}-section itself.
A theorem on the real part of the high-energy scattering amplitude near the forward direction
André Martin
Physics , 1997, DOI: 10.1016/S0370-2693(97)00510-8
Abstract: We show that if for fixed negative (physical) square of the momentum transfer t, the differential cross-section ${d\sigma\over dt}$ tends to zero and if the total cross-section tends to infinity, when the energy goes to infinity, the real part of the even signature amplitude cannot have a constant sign near t = 0.
The rigorous analyticity-unitarity program and its successes
André Martin
Physics , 1999,
Abstract: We show how the combination of analyticity properties derived from local field theory and the unitarity condition (in particular positivity) leads to non-trivial physical results, including the proof of the "Froissart bound" from first principles and the existence of absolute bounds on the pion-pion scattering amplitude.
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