24 research outputs found
Modelado en 3D de una puerta de la ciudad de Rennes del siglo XV: Portes Mordelaises
[EN] The Portes Mordelaises, remnants of the medieval city walls of Rennes, France, has been the subject of several archaeological excavations until 2017. From these excavations, we created a three-dimensional (3D) model of the site reconstructed as it would have appeared during the 15th century, including the surrounding plus the interiors of its famed towers. Once our efforts and results were officially recognised as being of national interest by the French Ministry of Culture and Communication, Department of Heritage and the National Museum Service of France, we presented our virtual model reconstruction in an exhibition curated by the Museum of Bretagne, entitled "Rennes, les vies d'une ville" (Rennes, the Lives of a City). This approach to 3D reconstruction of the site served to further study Rennes’ origins, its construction, organisation, as well as its historic relationship to surrounding territories. The main objective of this work was to investigate, using of a significant and com[ES] Las Portes Mordelaises, restos de las murallas medievales de la ciudad de Rennes, Francia, han sido objeto de varias excavaciones arqueológicas hasta el año 2017. A partir de estas excavaciones, pudimos crear un modelo tridimensional (3D) del sitio reconstruido tal y como habría aparecido durante el siglo XV, incluyendo los terrenos circundantes así como los interiores de sus famosas torres. Una vez que nuestros esfuerzos y resultados fueron reconocidos oficialmente como de interés nacional por el Ministerio de Cultura y Comunicación de Francia, el Departamento de Patrimonio así como el Servicio Nacional de Museos de Francia, presentamos nuestra reconstrucción del modelo virtual en una exposición gestionada por el Museo de Bretaña titulada "Rennes, las vidas de una ciudad”. Este enfoque de la reconstrucción en 3D del sitio sirvió para profundizar en el estudio de los orígenes de Rennes, su construcción, su organización, así como su relación histórica con los territorios circundantes. EBarreau, J.; Esnault, E.; Foucher, J.; Six, M.; Le Faou, C. (2020). 3D modelling of a 15th century city gate of Rennes: Portes Mordelaises. Virtual Archaeology Review. 11(22):41-55. https://doi.org/10.4995/var.2020.12653OJS41551122Ahmad, T., Afzal, M., Hayat, F., Asif, H. S., Ahsan, S., & Saleem, Y. (2012). Need for software design methodology for remote sensing applications. Life Sci Journal, 9(3), 2152-2156.Al-Baghdadi, M. A. S. (2017). 3D printing and 3D scanning of our ancient history: Preservation and protection of our cultural heritage and identity. International Journal of Energy and Environment, 8(5), 441-456.Alix, C., Carron, D., Roux-Capron, E., & Josserand, L. (2016). La porte Bannier, entrée principale de la ville d'Orléans aux XIVe-XVe siècles. 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Fouille programmée, RAP02919, Service Régional de l'Archéologie de Bretagne. Retrieved from http://bibliotheque.numerique.sra-bretagne.fr/files/original/f3e868678cdd1dd64a9cd2fd12efde4b.pdfEsnault, E. (2014b). Rennes (Ille-et-Vilaine). Les portes Mordelaises. Archéologie Médiévale, 44, 279.Esnault, E. (2015a). RENNES (35). Les Portes Mordelaises. Rapport intermédiaire de fp. Fouille programmée, RAP03063, Service Régional de l'Archéologie de Bretagne. Retrieved from http://bibliotheque.numerique.srabretagne.fr/files/original/912019e9c7133236f6611868b3b0fa86.pdfEsnault, E. (2015b). Rennes (Ille-et-Vilaine). Les portes Mordelaises. Archéologie Médiévale, 45, 250-251.Esnault, E. (2016a). RENNES (35). Les Portes Mordelaises. Rapport intermediaire 2015 de FP. Fouille programmée, RAP03203, Service Régional de l'Archéologie de Bretagne. Retrieved from http://bibliotheque.numerique.srabretagne.fr/files/original/034c4915717c242d2af1df753ce91089.pdfEsnault, E. (2016b). Rennes (Ille-et-Vilaine). 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Extracorporeal Membrane Oxygenation for Severe Acute Respiratory Distress Syndrome associated with COVID-19: An Emulated Target Trial Analysis.
RATIONALE: Whether COVID patients may benefit from extracorporeal membrane oxygenation (ECMO) compared with conventional invasive mechanical ventilation (IMV) remains unknown. OBJECTIVES: To estimate the effect of ECMO on 90-Day mortality vs IMV only Methods: Among 4,244 critically ill adult patients with COVID-19 included in a multicenter cohort study, we emulated a target trial comparing the treatment strategies of initiating ECMO vs. no ECMO within 7 days of IMV in patients with severe acute respiratory distress syndrome (PaO2/FiO2 <80 or PaCO2 ≥60 mmHg). We controlled for confounding using a multivariable Cox model based on predefined variables. MAIN RESULTS: 1,235 patients met the full eligibility criteria for the emulated trial, among whom 164 patients initiated ECMO. The ECMO strategy had a higher survival probability at Day-7 from the onset of eligibility criteria (87% vs 83%, risk difference: 4%, 95% CI 0;9%) which decreased during follow-up (survival at Day-90: 63% vs 65%, risk difference: -2%, 95% CI -10;5%). However, ECMO was associated with higher survival when performed in high-volume ECMO centers or in regions where a specific ECMO network organization was set up to handle high demand, and when initiated within the first 4 days of MV and in profoundly hypoxemic patients. CONCLUSIONS: In an emulated trial based on a nationwide COVID-19 cohort, we found differential survival over time of an ECMO compared with a no-ECMO strategy. However, ECMO was consistently associated with better outcomes when performed in high-volume centers and in regions with ECMO capacities specifically organized to handle high demand. This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License 4.0 (http://creativecommons.org/licenses/by-nc-nd/4.0/)
A three-dimensional analysis of fatigue crack paths in thin metallic sheets
International audienceFatigue crack growth in thin sheets of 7075 T651 aluminium alloy and S355 steel were characterised in 3D, using crack front markings and topographic reconstructions of fracture surfaces. Tests performed in air or in salt water produced different crack paths for similar mechanical condit ions, shear lips being reduced by corrosive environment, in the aluminium alloy as well as in the steel. Before the onset of shear lips development, tunnelling crack fronts were observed, due to the difference in closure effects at mid-thickness and near free surfaces. Tunnelling was progressively reduced and cancelled as slanted crack growth developed, even though DK I was reduced locally by crack twisting. This indicates a significant contribution of shear modes to the crack driving force, even though mode I striations are present in slanted zones. Elastic three-dimensional X-FEM computations were performed to analyse the observed crack growth kinetics, based on ΔKI , ΔKII and ΔKIII. The crack growth rates correlated much better to ΔKeq = √(ΔKI^2 + ΔKII^2 + (ΔKIII^2/(1-ν))) than to ΔKI. Elastic–plastic finite element simulations and the local application of a fatigue criterion with an amplitude-dependent critical plane were found to capture qualitatively the transition in fracture mode and its inhibition by side grooves
three-dimensional analysis of fatigue crack paths in thin metallic sheets
International audienceFatigue crack growth in thin sheets of 7075 T651 aluminium alloy and S355 steel were characterized in 3D, using crack front markings and topographic reconstructions of fracture surfaces. Tests in air or in salt water produced different crack paths for similar mechanical conditions, shear lips being reduced by the corrosive environment, in the aluminium alloy as well as in steel. Before the onset of shear lips development, tunnelling crack fronts were observed, but tunnelling was progressively reduced and cancelled as slanted crack growth developed, even though KI is reduced by crack twisting. This indicates a significant contribution of shear modes to the crack driving force, even though mode I striations are still present on slanted zones. KI, KII and KIII were computed by X-FEM taking into account the real crack path. The crack growth rates correlated much better to than to KI. Elastic-plastic finite element simulations and the local application of a fatigue criterion with an amplitude-dependent critical plane qualitatively captured the transition in fracture mode in 7075 T651
Sport heritage in VR: Real tennis case study
International audienceTraditional Sports and Games (TSG) are as varied as human cultures. Preserving knowledge of these practices is essential as they are an expression of intangible cultural heritage as emphasized by UNESCO (General Conference of United Nations Educational, Scientific and Cultural Organization, at its 25th session, 1989). With the increasing development of virtual reconstructions in the domain of Cultural Heritage, and thank to advances in the production and 3D animation of virtual humans, interactive simulations and experiences of these activities have emerged to preserve this intangible heritage. We propose a methodological approach to design an immersive reconstitution of a TSG in Virtual Reality, with a formalization of the elements involved in such a reconstitution and we illustrate this approach with the example of real tennis. Real tennis is a racket sport that has been played for centuries and is considered the ancestor of tennis. It was a very popular sport in Europe during the Renaissance period, practiced by every layer of the society. It is still practiced today in few courts in world, especially in France, United Kingdom, Australia and USA. It has been listed in the Inventory of Intangible Cultural Heritage in France since 2012. KEYWORDS sport heritage, virtual reality, intangible heritage and popular culture, real tennis, intangible heritage virtual reconstruction metho
The QUIDAM study: Hydroquinidine therapy for the management of Brugada syndrome patients at high arrhythmic risk
International audienc