8 research outputs found
Large-Scale Circulation Reversals in a 2D Rayleigh-Bénard cell
No full textWe consider the numerical simulation of a two-dimensional Rayleigh-B\'enard cell in the turbulent regime and . The flow is dominated by a large-scale inclined roll, the orientation of which switches intermittently in time. We use Proper Orthogonal Decomposition to identify the most energetic modes. We find that the first two modes respectively correspond to an antisymmetric and a symmetric mode. The next most energetic mode breaks the symmetry of the flow. During reversals, sharp variations in the temporal amplitudes of the modes are observed. We derive a low-dimensional model based on the first three most energetic modes which is able to reproduce the large-scale circulation reversals, in quantitative agreement with the simulation
The aesthetics of Samuel Beckett in the light of his correspondence
No full textL’étude de la correspondance de Samuel Beckett apporte un éclairage inédit sur l’oeuvre d’un auteur qui s’est toujours refusé à accorder entretiens et interviews, objectant son incapacité à s’exprimer vis-à-vis de sa création. Or, s’il n’évoqua jamais celle-ci publiquement, il en dévoile les tenants dans la sphère de l’intime, dont la correspondance et les cahiers allemands se veulent le reflet. Cette correspondance dévoile l’existence d’une esthétique singulière élaborée à l’aune de la réflexion beckettienne vis-à-vis des arts.The study of Samuel Beckett's correspondence sheds new light on the work of an author who always refused to give interviews, claiming that he was unable to express himself in relation to his creation. However, if he never evoked it publicly, he reveals its tenants in the sphere of intimacy, of which the correspondence and the German notebooks are intended to be the reflection. This correspondence reveals the existence of a singular aesthetic elaborated in the light of Becket's reflection on the arts
R-package for interval-wise testing procedure
No full textLAUREA MAGISTRALECostruzione e redazione della la documentazione della parte IWTP del R package fdatest.Construction and drafting of the documentation of the IWTP part of the R package fdatest
A Neural-Network-Based Synthetic Boundary Condition For Thesimulation Of Channel Turbulence
No full textInternational audienceWe describe a method combining Proper Orthogonal Decomposition (POD) and an artificial recurrent neural network to implement an inlet boundary condition for a turbulent channel flow. The boundary condition is reconstructed from POD modes, the amplitudes of which are predicted using a neural network (LSTM). We first assess the quality of the LSTM prediction in POD space. The reconstructed velocity is then used as an inlet boundary condition in a spatially developping channel. Statistics are compared with the reference and are found to be in relatively good agreement
Continuous monitoring of atmospheric aerosols by LIDAR remote sensing technics in the south-east of France at the Observatoire de Haute Provence and Marseille Longchamp sites in the framework of ACTRIS-France and of the ANR COoL-AMmetropolis project.
No full textInternational audienceSince 2018, the continuous monitoring of atmospheric aerosols by remote sensing technics was developed in the Aix-Marseille area, south-east of France. Two complementary sites located about 70 kilometers from each other, the first one at the Observatoire de Haute Provence (OHP) in a rural area and the second one in an urban environment at Longchamp site in the Marseille city center, were equiped with automatic aerosols Lidars (CIMEL CE376) and photometers (CIMEL CE318-T). The OHP site is part of the ACTRIS-France infrastructure for the long-term monitoring of aerosols, water vapor and reactive trace gases. The Longchamp one, that belongs to the regional air quality agency ATMOSUD, should join this infrastructure soon as well and is supported by the ANR COoL-AMmetropolis project for the present study. The ACTRIS-Fr data are hosted in the national AERIS/ICARE database. Furthermore, two other sites are equiped with remote sensing facilities : a ceilometer (Vaisala CL31) at Marignane, 25 km west of Marseille center, and radiosoudings at Nimes, about 70 km away. The datasets collected at the four sites allow us to study the boundary layer height variability in this coastal area, which is characterized by complex atmospheric dynamics and a tortuous topography. The boundary layer height is a key parameter to understand the variability of greenhouse gases and pollutants and its determination will be of great help for air quality and climate related studies. Also, our Lidars datasets are exploited to study the long-range transport of aerosols plumes outcoming from different sources (pyrogenic, volcanic, desertic…) and to  characterise the optical properties of such aerosols, which play a role on air quality and climate that needs to be better characterized. An overview of the results obtained so far will be presented
Étrangers dans la cité romaine
No full textDans les cités du monde romain, le phénomène de la coexistence entre populations d’origine allogène a pris diverses formes. Quels sont les critères qui régissent la définition des statuts des individus et des communautés par rapport à celui, dominant, des citoyens de la cité ? Comment se concrétise, au quotidien, la coexistence infra-communautaire dans le vécu des relations sociales ? Quelles sont les évidences qui permettent d’identifier et reconnaître les différents groupes sur le terrain ? Cet ouvrage, qui reproduit les Actes du Colloque qui a eu lieu à Valenciennes en octobre 2005, essaie d’apporter des réponses à ces questions, en mettant plus particulièrement l’accent sur les aspects normatifs, la dimension religieuse ainsi que sur les perspectives ouvertes par des découvertes archéologiques récentes en Gaule du Nord. D’un extrême à l’autre d’une échelle chronologique très étendue, des incolae de l’Italie républicaine aux lètes et fédérés barbares de la Gaule du Nord et des Germanies au Bas-Empire, l’attention des auteurs des contributions se porte surtout sur l’Occident, sans exclure, pour autant, dans une approche comparative, certaines réalités assez significatives de l’Orient méditerranéen
Incidence of severe critical events in paediatric anaesthesia (APRICOT): a prospective multicentre observational study in 261 hospitals in Europe
No full textBackground Little is known about the incidence of severe critical events in children undergoing general anaesthesia in Europe. We aimed to identify the incidence, nature, and outcome of severe critical events in children undergoing anaesthesia, and the associated potential risk factors. Methods The APRICOT study was a prospective observational multicentre cohort study of children from birth to 15 years of age undergoing elective or urgent anaesthesia for diagnostic or surgical procedures. Children were eligible for inclusion during a 2-week period determined prospectively by each centre. There were 261 participating centres across 33 European countries. The primary endpoint was the occurence of perioperative severe critical events requiring immediate intervention. A severe critical event was defined as the occurrence of respiratory, cardiac, allergic, or neurological complications requiring immediate intervention and that led (or could have led) to major disability or death. This study is registered with ClinicalTrials.gov, number NCT01878760. Findings Between April 1, 2014, and Jan 31, 2015, 31â127 anaesthetic procedures in 30â874 children with a mean age of 6·35 years (SD 4·50) were included. The incidence of perioperative severe critical events was 5·2% (95% CI 5·0â5·5) with an incidence of respiratory critical events of 3·1% (2·9â3·3). Cardiovascular instability occurred in 1·9% (1·7â2·1), with an immediate poor outcome in 5·4% (3·7â7·5) of these cases. The all-cause 30-day in-hospital mortality rate was 10 in 10â000. This was independent of type of anaesthesia. Age (relative risk 0·88, 95% CI 0·86â0·90; p<0·0001), medical history, and physical condition (1·60, 1·40â1·82; p<0·0001) were the major risk factors for a serious critical event. Multivariate analysis revealed evidence for the beneficial effect of years of experience of the most senior anaesthesia team member (0·99, 0·981â0·997; p<0·0048 for respiratory critical events, and 0·98, 0·97â0·99; p=0·0039 for cardiovascular critical events), rather than the type of health institution or providers. Interpretation This study highlights a relatively high rate of severe critical events during the anaesthesia management of children for surgical or diagnostic procedures in Europe, and a large variability in the practice of paediatric anaesthesia. These findings are substantial enough to warrant attention from national, regional, and specialist societies to target education of anaesthesiologists and their teams and implement strategies for quality improvement in paediatric anaesthesia. Funding European Society of Anaesthesiology
Incidence of severe critical events in paediatric anaesthesia (APRICOT) : a prospective multicentre observational study in 261 hospitals in Europe
No full textBackground: Little is known about the incidence of severe critical events in children undergoing general anaesthesia in Europe. We aimed to identify the incidence, nature, and outcome of severe critical events in children undergoing anaesthesia, and the associated potential risk factors.
Methods: The APRICOT study was a prospective observational multicentre cohort study of children from birth to 15 years of age undergoing elective or urgent anaesthesia for diagnostic or surgical procedures. Children were eligible for inclusion during a 2-week period determined prospectively by each centre. There were 261 participating centres across 33 European countries. The primary endpoint was the occurence of perioperative severe critical events requiring immediate intervention. A severe critical event was defined as the occurrence of respiratory, cardiac, allergic, or neurological complications requiring immediate intervention and that led (or could have led) to major disability or death. This study is registered with ClinicalTrials.gov, number NCT01878760.
Findings: Between April 1, 2014, and Jan 31, 2015, 31 127 anaesthetic procedures in 30 874 children with a mean age of 6.35 years (SD 4.50) were included. The incidence of perioperative severe critical events was 5.2% (95% CI 5.0-5.5) with an incidence of respiratory critical events of 3.1% (2.9-3.3). Cardiovascular instability occurred in 1.9% (1.7-2.1), with an immediate poor outcome in 5.4% (3.7-7.5) of these cases. The all-cause 30-day in-hospital mortality rate was 10 in 10 000. This was independent of type of anaesthesia. Age (relative risk 0.88, 95% CI 0.86-0.90; p<0.0001), medical history, and physical condition (1.60, 1.40-1.82; p<0.0001) were the major risk factors for a serious critical event. Multivariate analysis revealed evidence for the beneficial effect of years of experience of the most senior anaesthesia team member (0.99, 0.981-0.997; p<0.0048 for respiratory critical events, and 0.98, 0.97-0.99; p=0.0039 for cardiovascular critical events), rather than the type of health institution or providers.
Interpretation: This study highlights a relatively high rate of severe critical events during the anaesthesia management of children for surgical or diagnostic procedures in Europe, and a large variability in the practice of paediatric anaesthesia. These findings are substantial enough to warrant attention from national, regional, and specialist societies to target education of anaesthesiologists and their teams and implement strategies for quality improvement in paediatric anaesthesia
