77 research outputs found
Description de vignettes type Bandes dessinées
No full textDescription de vignettes de bandes dessinéesIl s'agit initialement d'un corpus d'enregistrements de 20 sujets répartis en deux groupes. Dans le cadre d'une étude portant sur l'évaluation de la théorie de l'esprit (e.g. attribution d'états mentaux tels que croyances, connaissances aux autres) en situation de discours chez des patients atteints de schizophrénie (Tosello, 2011). Les données ici présentes sont extraites des données du groupe contrôle apparié en âge et en niveau d'éducation au groupe de patients. La consigne était de raconter l'histoire à l'expérimentateur. Les transcriptions sont faites sous Praat en utilisant la TOE et enregistrées dans des fichiers Textgrid. Ces transcriptions sont ensuite traitées automatiquement pour être annotées à différents niveaux puis transformées en un document XML avec fichier style associé.Reference : Tosello, A.L. (2011). Evaluation de l'attribution d'états mentaux, en situation de discours, dans la schizophrénie. Mémoire Master 2 de Psychologie et neuropsychologie des perturbations cognitives. Université d'Aix-Marseille
Operadic structure of boundary conditions for two-dimensional Markov Gaussian random fields on the lattice
No full textThe theory of Markov processes on the square lattice has been given recently by the second author a new algebraic description in terms of operads. In particular, this new approach allows for a nice description of invariant boundary conditions and infinite-volume Gibbs measures. This theory comes with new algebraic objects which have not been constructed on any non trivial model yet. In this article, the main objective is to exhibit and understand these structures in the particular case of Gaussian Markov fields on the two-dimensional square lattice. This article, in the Gaussian framework, is the first time where all the operadic constructions -- products and eigen-elements up to morphisms -- introduced by the second author are defined rigorously. We also relate these constructions to more classical approach such as the transfer matrix of statistical mechanics and the Fourier transform. The description of half-strips and corners is new and requires the introduction of new operations such as folding. From the probabilistic point of view, we also show that the operadic products on the boundaries are not easily defined and most operations are lifted to the level of parameter spaces, here quadratic forms through Schur complements.43 pages, shortened version for publication requirements (see version 1 for more content about operads
Collapse dynamics of two-dimensional dry and immersed granular columns of elongated grains
No full textThe collapse dynamics and runout of columns of elongated grains in two dimensions are numerically investigated in dry and immersed conditions, by means of an unresolved finite elements/discrete elements model. The elongated grains are modeled as rigid aggregates of disks. The column aspect ratio is systematically varied from 0.125 to 16 in order to span short and tall columns. To analyze the effect of the initial grain orientation, columns with an initial grain orientation that is either random or aligned with a given direction are both considered. Collapse dynamics, both in dry and immersed cases, are found analogous to that previously observed for circular grain columns, particularly with respect to the power law dependency for the runout as a function of the column aspect ratio. The effect of the fluid mainly results in a decrease of the runout distance. Interestingly, the collapse dynamics and runout are not significantly affected by the initial orientation of the grains, except maybe in the extreme case where the grains are all horizontally oriented, which geometrically prevents the collapse. Finally, a scaling based on the front propagation energy is proposed allowing one to unify the runout of short to tall and dry to immersed columns in a single description, regardless of the initial grain orientation.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Geo-engineerin
Mechanical loading dependence on burning surface areas
No full textInternational audienceThe transition from normal (surface) to abnormal (convective) burning modes of explosives is still a difficult phenomenon to model. This transition, which yields the acceleration of the combustion propagation, could result in a violent reaction. Nowadays, abnormal burning is interpreted as an increase in burning surface area. The latter depends on the initial state of the microstructure and therefore of the mechanical history. This paper considers the coupling between the combustion of HMX-based polymerbonded explosives and its previous mechanical loadings. The experimental set-ups used to (1) apply a triaxial compression (that mimics the mechanical fields experienced by the explosive composition when submitted to a Steven test) and ( 2) burn the samples in a closed vessel will be described. Experiments show a strong dependence on the critical pressure leading to abnormal combustion on a previous mechanical loading. An analytical model is proposed to determine the real-time burning surface area during combustion. It enables modelling of the increase in surface area increase when the critical pressure is reached. Experimental results and surface determinations are presented in this paper. Future works will be discussed
Granular column collapse: The role of particle size polydispersity on the velocity and runout
No full textGeophysical mass flows involve particles of different sizes, a property termed polydispersity. The granular column collapse is a simplified experiment for studying transitional granular flows. Our research focuses on the role that polydispersity has on the velocity and runout distance of dry and immersed granular columns, undergoing a numerical and experimental study. Our results highlight that polydispersity does not have a strong effect on the collapse of dry columns. On the contrary, the collapse sequence of immerse granular columns strongly depend on the polydispersity level.Geo-engineerin
Aix-DVD
No full textThe recording situation involves two participants sitting in front of each other with a table in the middle. 8 DVD boxes with the labels were placed on the table. The instruction is to have a conversation and that at the end (after 30) minutes, each participant may leave the recording booth with two DVDs. This setting involved therefore some negotiation and discussion
Audio-visual condition of Aix Map Task
No full textThis is the audio-visual condition of the Aix Map Task corpus. Two participants sit face-to-face and complete the Map Task. They are native speakers of French. The audio was recorded on head mounted microphones. The video is recorded individually for each participant on MiniDV cameras. Due to image loss, the audio and video are synchronised using a method described in a paper submitted to the IEEE ICASSP 2015 conference in Brisbane. The data and scripts used for the synchonisation process can be found in the file “Segmentation_Audio_Video.zip“.Ceci est la condition audio-visuelle du corpus Aix Map task. Deux participants sont assis face-à-face et effectuent la Map Task
[EFF15S6] Session 7: Constanze Ruhm, Re-staging the Locations of Film History
No full text27 March 2015, 12:30, Birkbeck Cinema
Constanze Ruhm is an artist and author, whose work, exhibited internationally, encompasses installations, films and videos, publications and curatorial activities. Her artistic practice explores the interactions between film, film theory, theatrical forms, and new media, primarily with regard to questions of identity, representation and (feminist) film theory. Since 2006, she has been professor for Art and Media at the Academy of Fine Arts Vienna. Since 2007, she has also been an adjunct professor at the Art Institute Boston/Lesley University.
This event, combining screenings and discussion, was structured in two parts.
Part one – Constanze Ruhm in conversation with Roland-Francois Lack (UCL, creator of website: The Cine-Tourist) [Link: https://www.thecinetourist.net]
In La Difficulté d’une perspective: A Life of Renewal (2013), Constanze Ruhm, with Emilien Awada and using location research by Roland-Francois Lack, created this photographic series of eight locations from Une Femme est une femme (Jean-Luc Godard, 1961) shot from two different perspectives: first, as a precise replica of a shot from the original film, and then as a representation of the subjective perspective of the main female character (Angela/Anna Karina). The photos show what Anna Karina must have seen when she herself was seen by Godard and his camera.
Part two – screening and presentation
Film: Panoramis Paramount Paranormal (part of the Invisible Producers series), Constanze Ruhm with Emilien Awada, Austria, 2014, digital, 59 minutes, French and German with English subtitles
Out of their work on Une Femme est une femme, Ruhm and Awarda discovered the film studio St. Maurice, founded in 1913 and destroyed by fire in 1971. The film focuses on the history of this specific location and its place within the history of cinema. Subsequently, the apartment complex Le Panoramis was built on the same site
Grain size distribution does not affect the residual shear strength of granular materials: An experimental proof
No full textGranular materials are used in several fields and in a wide variety of processes. An important feature of these materials is the diversity of grain sizes, commonly referred to as polydispersity. When granular materials are sheared, they exhibit a predominant small elastic range. Then, the material yields, with or without a peak shear strength depending on the initial density. Finally, the material reaches a stationary state, in which it deforms at a constant shear stress, which can be linked to the residual friction angle φr. However, the role of polydispersity on the shear strength of granular materials is still a matter of debate. In particular, a series of investigations have proved, using numerical simulations, that φr is independent of polydispersity. This counterintuitive observation remains elusive to experimentalists, and especially for some technical communities that use φr as a design parameter (e.g., the soil mechanics community). In this Letter, we studied experimentally the effects of polydispersity on φr. In order to do so, we built samples of ceramic beads and then sheared these samples in a triaxial apparatus. We varied polydispersity, building monodisperse, bidisperse, and polydisperse granular samples; this allowed us to study the effects of grain size, size span, and grain size distribution on φr. We find that φr is indeed independent of polydispersity, confirming the previous findings achieved through numerical simulations. Our work fairly closes the gap of knowledge between experiments and simulations. </p
Comparison of three 3D scanning techniques for paintings, as applied to Vermeer’s ‘Girl with a Pearl Earring’
No full textA seventeenth-century canvas painting is usually comprised of varnish and (translucent) paint layers on a substrate. A viewer’s perception of a work of art can be affected by changes in and damages to these layers. Crack formation in the multi-layered stratigraphy of the painting is visible in the surface topology. Furthermore, the impact of mechanical abrasion, (photo)chemical processes and treatments can affect the topography of the surface and thereby its appearance. New technological advancements in non-invasive imaging allow for the documentation and visualisation of a painting’s 3D shape across larger segments or even the complete surface. In this manuscript we compare three 3D scanning techniques, which have been used to capture the surface topology of Girl with a Pearl Earring by Johannes Vermeer (c. 1665): a painting in the collection of the Mauritshuis, the Hague. These three techniques are: multi-scale optical coherence tomography, 3D scanning based on fringe-encoded stereo imaging (at two resolutions), and 3D digital microscopy. Additionally, scans were made of a reference target and compared to 3D data obtained with white-light confocal profilometry. The 3D data sets were aligned using a scale-invariant template matching algorithm, and compared on their ability to visualise topographical details of interest. Also the merits and limitations for the individual imaging techniques are discussed in-depth. We find that the 3D digital microscopy and the multi-scale optical coherence tomography offer the highest measurement accuracy and precision. However, the small field-of-view of these techniques, makes them relatively slow and thereby less viable solutions for capturing larger (areas of) paintings. For Girl with a Pearl Earring we find that the 3D data provides an unparalleled insight into the surface features of this painting, specifically related to ‘moating’ around impasto, the effects of paint consolidation in earlier restoration campaigns and aging, through visualisation of the crack pattern. Furthermore, the data sets provide a starting point for future documentation and monitoring of the surface topology changes over time. These scans were carried out as part of the research project ‘The Girl in the Spotlight’.Mechatronic Design(OLD) MSE-4Human Information Communication Desig
- …
