98 research outputs found
Simulation directe 2D et 3D de la dispersion d'agglomérats sous cisaillement dans une matrice polymère
Nous avons développé une méthode de simulation directe de la dispersion de charges sphériques dans une matrice polymère soumise à un cisaillement. L'agglomérat est immergé dans un fluide newtonien et incompressible. Il est considéré comme un assemblage de sphères liées entre elles par une énergie de cohésion, modélisée par une viscosité de cohésion. Les paramètres de ce modèle sont la contrainte hydrodynamique et la longueur caractéristique de la zone d'influence des sphères. Ce modèle simple permet une première approche du phénomène de dispersion dans un écoulement de cisaillement. Les tendances observées lors des simulations menées en 2D et 3D montrent qu'une augmentation du taux de cisaillement entraîne une érosion plus rapide de la charge
Finite element model of primary recrystallization in polycrystalline aggregates using a level set framework
Change-of-state Paradigms and the middle in Kinyarwanda
This paper investigates the derivational relationships among members of verbal paradigms in Kinyarwanda (Bantu JD.61; Rwanda) by pursuing two interrelated goals. First, I describe a variety of derivational strategies for marking transitive and intransitive variants in change-of-state verb paradigms. Second, I focus on the detransitivizing morpheme –ik which serves as one possible marking for intransitive members of these paradigms. Ultimately, I argue that this morpheme is a marker of middle voice, and the variety of readings which appear with this form can be subsumed under a single operation of argument suppression. Finally, I provide a discussion of reflexives and the apparent lack of a reflexive reading with –ik by arguing that this reading is blocked by either lexical reflexives or the reflexive prefix i–
Impact of species and antibiotic therapy of enterococcal peritonitis on 30-day mortality in critical care - An analysis of the OUTCOMEREA database
Introduction: Enterococcus species are associated with an increased morbidity in intraabdominal infections (IAI). However, their impact on mortality remains uncertain. Moreover, the influence on outcome of the appropriate or inappropriate status of initial antimicrobial therapy (IAT) is subjected to debate, except in septic shock. The aim of our study was to evaluate whether an IAT that did not cover Enterococcus spp. was associated with 30-day mortality in ICU patients presenting with IAI growing with Enterococcus spp. Material and methods: Retrospective analysis of French database OutcomeRea from 1997 to 2016. We included all patients with IAI with a peritoneal sample growing with Enterococcus. Primary endpoint was 30-day mortality. Results: Of the 1017 patients with IAI, 76 (8%) patients were included. Thirty-day mortality in patients with inadequate IAT against Enterococcus was higher (7/18 (39%) vs 10/58 (17%), p = 0.05); however, the incidence of postoperative complications was similar. Presence of Enterococcus spp. other than E. faecalis alone was associated with a significantly higher mortality, even greater when IAT was inadequate. Main risk factors for having an Enterococcus other than E. faecalis alone were as follows: SAPS score on day 0, ICU-acquired IAI, and antimicrobial therapy within 3 months prior to IAI especially with third-generation cephalosporins. Univariate analysis found a higher hazard ratio of death with an Enterococcus other than E. faecalis alone that had an inadequate IAT (HR = 4.4 [1.3-15.3], p = 0.019) versus an adequate IAT (HR = 3.1 [1.0-10.0], p = 0.053). However, after adjusting for confounders (i.e., SAPS II and septic shock at IAI diagnosis, ICU-acquired peritonitis, and adequacy of IAT for other germs), the impact of the adequacy of IAT was no longer significant in multivariate analysis. Septic shock at diagnosis and ICU-acquired IAI were prognostic factors. Conclusion: An IAT which does not cover Enterococcus is associated with an increased 30-day mortality in ICU patients presenting with an IAI growing with Enterococcus, especially when it is not an E. faecalis alone. It seems reasonable to use an IAT active against Enterococcus in severe postoperative ICU-acquired IAI, especially when a third-generation cephalosporin has been used within 3 months. © 2019 The Author(s)
Perspectives of multi-heterojunction HFET's for power amplification in millimeter wave range
There is a considerable interest in the development of high power, high efficiency HFETs for millimeter wave applications. Thanks to the great progress accomplished during the last few years in MBE growth multiheterojunction devices have reach such a maturity that they now offer attractive capabilities. This paper reports on results obtained with especially designed structures and discusses their optimization on the basis of modelling and characterizations. It shows that devices with more than 1A of drain current, 10 V of Breakdown voltage, 60 GHz of cut-off frequency are now within the realm of possibility
Multiscale simulation of mixing processes using 3D-parallel, fluid-structure interaction techniques
Statistiques lexicale et grammaticale pour la classification historique des langues bantoues
info:eu-repo/semantics/publishe
Classification lexicostatique des langues bantoues (214 relevés)
info:eu-repo/semantics/publishe
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