Production of new neutron-rich isotopes of heavy elements in fragmentation reactions of 238^{238}U projectiles at 1 A GeV

The production of heavy neutron-rich nuclei has been investigated using cold fragmentation reactions of $^{238}$U projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer FRS at GSI allowed to identify 45 new heavy neutron-rich nuclei: $^{205}$Pt, $^{207-210}$Au, $^{211-216}$Hg, $^{213-217}$Tl, $^{215-220}$Pb, $^{219-224}$Bi, $^{221-227}$Po, $^{224-229}$At, $^{229-231}$Rn and $^{233}$Fr. The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability.Comment: 5 pages, 2 figure

Volumetric Calibration Refinement using masked back projection and image correlation superposition

This paper deals with a new, reconstruction based, approach of refining a volumetric calibration. The technique is based on a 2D cross-correlation between particle images on the sensor plane with a planar back projection from a tomographic reconstruction in the same sensor plane to determine potential disparities between the initial camera calibration and the measurement. Additive superposition of the correlation maps from different sets or particle images allows reducing the influence of noise and ghost particles such that the systematic errors in the calibration can be corrected. The different sections describe the theory, the principle processing steps and the convergence of the procedure. Furthermore, the concept is proven by simulating the entire process of the measurement chain, with the help of a synthetic comparison. The results show that disparities of over 9 pixels could be corrected to an average of below 0.1 pixels during the refinement steps. Finally, the technique demonstrates it´s potential to measured data, where the numbers of outliers in the raw results are reduced after the volumetric calibration refinement

Three-dimensional analysis of mandibular landmarks, planes and shape, and the symphyseal changes associated with growth and orthodontic treatment

OBJECTIVE: To test reliability of 3D mandibular landmarks, planes of reference and surfaces and assess their correlation to conventional 2D cephalometric measurements. To analyze changes in three-dimensional shape of the symphysis due to growth and orthodontic treatment. METHODS: This was a retrospective analysis of CBCTs of healthy orthodontic patients. 32 subjects were included, 16 males and 16 females. Mean ages of 10.6 ± 1.5 years and 15.0 ± 0.9 years before and after treatment, respectively. The mean follow up time was 4.3 years. Subjects free of any craniofacial anomalies, and no observable pathology on panoramic radiograph were. 15 subjects had CVM 1 and 17 subjects had CVM 2 before orthodontic treatment. All subjects had CVM 5 after orthodontic treatment. For the first phase, 3D mandibular landmark identifications were digitized. Planes and landmarks were constructed and compared with conventional 2D mandibular measurements. For the second phase, mandibles were isolated by removing surrounding structures. Pearson correlation and paired t-test were performed to test for correlation and differences between 2D and 3D measurements, respectively. Statistical analysis was performed using SAS 9.4. Software. MorphoJ software (Version 2.0, www.flywings.org.uk) was used for symphysis shape analysis; and Discriminant Function Analysis (DFA) between pre-treatment and post-treatment was used for statistical analysis of the symphysis. RESULTS: We found statistical significant positive correlation between 2D and 3D pre-treatment ramus height (P-value =0.01), post-treatment ramus height (P-value < 0.0001), pre-treatment corpus length (P-value 0.0003), post-treatment corpus length (P-value 0.04), pre-treatment gonial angle (P-value <0.0001), and post-treatment gonial angle (P-value=0.05). Also, statistically significant differences in 2D ramus height (P=0.001), 3D ramus height (P-value=0.002), 2D corpus length (P-value <0.01), and 3D corpus length (P-value <0.01). For symphysis shape comparing between pre-treatment and post-treatment, we found that there is no statistically significant difference between them (P-value= 0.99). CONCLUSION: These results demonstrated statistically significant positive correlation between certain 2D and 3D measurements, pre-treatment and post-treatment differences in 2D and 3D measurements showed consistent results. Symphysis shapes do break out as distinctly separate groups, but the differences between the means is small

ECAL Graphic Design

Ce recueil de productions d’étudiants issus de l’ECAL (Ecole Cantonale d’Art de Lausanne) est l’occasion de faire un point sur un cycle pédagogique initié par François Rappo et Angelo Benedetto entre 2010 et 2015, et dont la finalité est le graphisme, la photographie et la direction artistique. Intrigant, le dispositif éditorial présente des images planes (posters, photographies, écrans de tablettes numériques), plus rarement des livres ou du textile imprimé, dans un espace scénographique com..

Perspective et constructions

Les images réalisées avec un appareil photographique ou une caméra pour être tirées sur papier ou projetées sur un écran sont soumises aux règles de la construction perspective des images planes. Très tôt, les réalisateurs et décorateurs de cinéma ont donc dû tenir compte des caractéristiques optiques de ces outils et des propriétés de la perspective à laquelle ils étaient confrontés. C'est pourquoi, dès le début du siècle dernier, l'industrie naissante du cinéma a fait appel au savoir-faire ..

Caractérisation 3d d'images IRM pour l'analyse de l'ostéochondrite primitive de la hanche

- L'interface utilisateur développée fournit des indices coxométriques pour caractériser l'état global de l'articulation de la hanche. Le logiciel 3D Slicer sert d'interface pour la visualisation 3D. La technique des ensembles de niveaux est utilisée pour segmenter chaque type de structure. Elle s'adapte à la topologie de la maladie à caractériser (fragmentation) et au type d'examen IRM (T1 ou T2). Un modèle géométrique est ensuite construit. Des indices géométriques tridimensionnels sont calculés automatiquement : excentration de la tête, volume de la tête, volume des cartilages céphalique et acétabulaire, distance tête-cotyle. Ces mesures exploitent l'ensemble des images planes IRM et quantifient les déformations liées à la maladie. Elles peuvent servir à préparer une intervention chirurgicale ou à surveiller l'évolution de la maladie

Omnidirectional video

Omnidirectional video enables direct surround immersive viewing of a scene by warping the original image into the correct perspective given a viewing direction. However, novel views from viewpoints off the camera path can only be obtained if we solve the 3D motion and calibration problem. In this paper we address the case of a parabolic catadioptric camera – a paraboloidal mirror in front of an orthographic lens – and we introduce a new representation, called the circle space, for points and lines in such images. In this circle space, we formulate an epipolar constraint involving a 4x4 fundamental matrix. We prove that the intrinsic parameters can be inferred in closed form from the 2D subspace of the new fundamental matrix from two views if they are constant or from three views if they vary. Three dimensional motion and structure can then be estimated from the decomposition of the fundamental matrix

Development of methods for analysis of knee articular cartilage degeneration by magnetic resonance imaging data

Publisher Copyright: © Published under licence by IOP Publishing Ltd.The aim of this paper is to describe the new methods for analyzing knee articular cartilage degeneration. The most important aspects regarding research about magnetic resonance imaging, knee joint anatomy, stages of knee osteoarthritis, medical image segmentation and relaxation times calculation. This paper proposes new methods for relaxation times calculation and medical image segmentation. The experimental part describes the most important aspect regarding analysing of articular cartilage relaxation times changing. This part contains experimental results, which show the codependence between relaxation times and organic structure. These experimental results and proposed methods can be helpful for early osteoarthritis diagnostics.publishersversionPeer reviewe

Placement de caméras et ajustement automatique des paramètres de stéréoscopie

La visualisation 3D stéréoscopique connaît un regain d'intérêt avec l'apparition sur le marché grand public de dispositifs de visualisation à des coûts très abordables. Cependant, ces écrans engendrent une fatigue visuelle inhérente aux systèmes d'affichage stéréoscopique essentiellement en raison de la divergence entre les stimuli d'accommodation et de convergence. Ce problème a fait l'objet de nombreuses recherches mais ces résultats sont encore peu exploités dans le monde de l'infographie 3D alors que les paramètres de prise de vue sont beaucoup plus facilement contrôlables que dans le cas d'une acquisition vidéo. Le travail réalisé s'appuie sur le contrôle différencié de la disparité, pour proposer une méthode de compression progressive de l'espace virtuel, de manière à obtenir le meilleur compromis possible entre confort et qualité de visualisation