Quantum revival for elastic waves in thin plate

Quantum revival is described as the time-periodic reconstruction of a wave packet initially localized in space and time. This effect is expected in finite-size systems which exhibits commensurable discrete spectrum such as the infinite quantum well. Here, we report on the experimental observation of full and fractional quantum revival for classical waves in a two dimensional cavity. We consider flexural waves propagating in thin plates, as their quadratic dispersion at low frequencies mimics the dispersion relation of quantum systems governed by Schr\"{o}dinger equation. Time-dependent excitation and measurement are performed at ultrasonic frequencies and reveal a periodic reconstruction of the initial elastic wave packet.Comment: submitted to the special issue of EPJ ST in honor of scientific legacy of Roger Maynar

Maps, Travel and Exploration in the Middle Ages: Some Reflections about Anachronism

Abstract: How were maps conceived in the Middle Ages? Using the words “map”, “travel” and “exploration”, historians must be wary of anachronism. Medieval maps, like ours maps, are always materialized thought-objects and are thus interpretations of the world, inevitably variable and subject to criticism; in this respect, “modernity” has neither invented nor changed anything. The article addresses some anachronisms about the role of mappae mundi in mental journeys, their function in maritime travels and their role during the great “discoveries”; it claims that no other pre-modern civilization, except perhaps the Chinese, was ever so imbuedwith cartographic culture

Chet Van Duzer, Henricus Martellus’s World Map at Yale (c. 1491): Multispectral Imaging, Sources, and Influence

Revie

Maps, Travel and Exploration in the Middle Ages: Some Reflections about Anachronism

Abstract: How were maps conceived in the Middle Ages? Using the words “map”, “travel” and “exploration”, historians must be wary of anachronism. Medieval maps, like ours maps, are always materialized thought-objects and are thus interpretations of the world, inevitably variable and subject to criticism; in this respect, “modernity” has neither invented nor changed anything. The article addresses some anachronisms about the role of mappae mundi in mental journeys, their function in maritime travels and their role during the great “discoveries”; it claims that no other pre-modern civilization, except perhaps the Chinese, was ever so imbuedwith cartographic culture

Extracting (good) discourse examples from an oral specialised corpus of wine tasting interactions

International audienceThis article outlines the semi-automated extraction of dictionary examples used in the compilation of a professional online dictionary of wine tasting. Named OenoLex Bourgogne, this dictionary was started to respond to the demand for a lexicographic information tool from the French wine industry of Burgundy, the Bureau Interprofessionnel des Vins de Bourgogne

John Ford i L'home que matà Liberty Valance

Abstract not availabl

Ag2.54Tl2Mo12Se15: a new structure type containing Mo6 and Mo9 clusters

wosInternational audienceThe novel structure-type Ag2.54Tl2Mo12Se15 (silver thallium molybdenum selenide) is built up of Mo6Sei8Sea6 and Mo9Sei11Sea6 cluster units in a 1:2 ratio, which are three-dimensionally connected to form the Mo-Se network. The Ag and Tl cations are distributed in several voids within the cluster network. Three of the seven independent Se atoms and one Tl atom lie on sites with 3.. symmetry (Wyckoff sites 2c or 2d)

Rôle de CD47 dans l’induction de la tolérance in vivo

La tolérance orale permet la modulation de la réponse immunitaire à l’égard des antigènes exogènes présents dans la lumière intestinale. Essentiels à l’établissement d’une relation symbiotique entre le système immunitaire et la flore intestinale, l’induction et le maintien de la tolérance orale reposent sur différents mécanismes immunologiques. Parmi eux, l’induction de cellules T régulatrices par les cellules dendritiques et de mécanismes apoptotiques. Or, la glycoprotéine membranaire CD47 est impliquée, en périphérie, dans ces mécanismes. Cependant, le rôle de CD47 dans la tolérance orale n’est pas connu. À l’aide d’un modèle murin déficient en CD47, nous avons démontré principalement, que l’absence de CD47 est associée à une diminution de 50 % de la proportion de cellules dendrites myéloïdes CD11b+CD103- retrouvées dans les ganglions mésentériques. Suite au transfert adoptif de cellules T antigènes spécifiques dans nos différents modèles expérimentaux, on a, aussi, observé une diminution de 45 % de leur niveau d’activation dans les ganglions mésentériques. Malgré les effets observés, le CD47 n’est pas impliqué dans l’induction d’une réaction de tolérance orale secondaire à l’administration intragastrique de fortes doses d’ovalbumine. Cependant, nous avons démontré que CD47 est impliquée au niveau de la migration des cellules dendritiques de la peau et de certaines sous-populations retrouvées dans les ganglions mésentériques.Oral tolerance allows the modulation of the immune response against exogenous antigens present in the intestinal lumen. Essential to establish a symbiotic relationship between the immune system and intestinal flora, the induction and maintenance of oral tolerance rests on different immunological mechanisms. Among them, induction of regulatory T cells by dendritic cells and apoptotic mechanisms. However, the membrane glycoprotein CD47 is involved in the periphery of these mechanisms. However, the role of CD47 in oral tolerance is unknown. With a mouse model deficient in CD47, we showed mainly that the absence of CD47 is associated with a decrease of 50% in the proportion of myeloid dendritic cells CD11b+ CD103- found in the mesenteric lymph nodes. Following the adoptive transfer of antigen specific T cells in our experimental models, we also observed a decrease of 45% of their level of activation in mesenteric lymph nodes. Despite the observed effects, CD47 is not involved in the induction of oral tolerance response secondary to intragastric administration of high doses of ovalbumin. However, we have shown that CD47 is involved in the migration of dendritic cells of the skin and some sub-populations found in mesenteric lymph nodes

Les représentations de l’espace en Occident de l’Antiquité tardive au xvie siècle

Programme de l’année 2010-2011 : I. Représentations de l’espace et souveraineté au Moyen Âge. — II. Cartographie à grande échelle en France (Moyen Âge – début xvie siècle)

À propos de la mappemonde d’Ebstorf

La mappemonde du monastère féminin d’Ebstorf en Saxe, diversement datée dans le courant du xiiie ou du xive siècle, n’est plus connue que par des fac-similés antérieurs à sa destruction lors de la seconde guerre mondiale. Par ses dimensions (une trentaine de feuilles de parchemin cousues ensemble mesurant au total 3,58 x 3,56 m et couvrant 12,74 m²), c’était la plus grande et la plus riche des mappae mundi monumentales du Moyen Âge. Outre des textes écrits dans les parties extérieures, elle c..