Search results for "strophe"
showing 10 items of 62 documents
Fire risk sub-module assessment under solvency II. Calculating the highest risk exposure
2021
The European Directive 2009/138 of Solvency II requires adopting a new approach based on risk, applying a standard formula as a market proxy in which the risk profile of insurers is fundamental. This study focuses on the fire risk sub-module, framed within the man-made catastrophe risk module, for which the regulations require the calculation of the highest concentration of risks that make up the portfolio of an insurance company within a radius of 200 m. However, the regulations do not indicate a specific methodology. This study proposes a procedure consisting of calculating the cluster with the highest risk and identifying this on a map. The results can be applied immediately by any insur…
Decoherence in a fermion environment: Non-Markovianity and Orthogonality Catastrophe
2013
We analyze the non-Markovian character of the dynamics of an open two-level atom interacting with a gas of ultra-cold fermions. In particular, we discuss the connection between the phenomena of orthogonality catastrophe and Fermi edge singularity occurring in such a kind of environment and the memory-keeping effects which are displayed in the time evolution of the open system.
Un exemple d'effets de dominos : la panique dans les catastrophes urbaines
2005
International audience; Dans le cadre de cet article, nous proposons d'étudier les effets de dominos, une des sources de complexité des risques et des catastrophes. Ces derniers émergent tout particulièrement lors de catastrophes urbaines. Ils sont considérés comme essentiels par la majorité de nos devanciers. Mais malgré ce poids accordé aux effets dominos en milieu urbain par tous les spécialistes des risques, il semble que peu de modèles les mettent réellement en situation. La modélisation en dynamique de système permettant d'appréhender cette complexité, elle a été retenue pour construire un modèle de catastrophe. Elle est mise en pratique avec le logiciel Stella Research pour simuler u…
Gard et Hérault : réactions, critiques et propositions des populations
2004
National audience
Airy-function approach to binary black hole merger waveforms: The fold-caustic diffraction model
2022
From numerical simulations of the Einstein equations, and also from gravitational wave observations, the gravitational wave signal from a binary black hole merger is seen to be simple and to possess certain universal features. The simplicity is somewhat surprising given that non-linearities of general relativity are thought to play an important role at the merger. The universal features include an increasing amplitude as we approach the merger, where transition from an oscillatory to a damped regime occurs in a pattern apparently oblivious to the initial conditions. We propose an Airy-function pattern to model the binary black hole (BBH) merger waveform, focusing on accounting for its simpl…
Les différentes formes de complexité des systèmes de risque et de catastrophe
2007
International audience
Emergence de comportements humains spécifiques face à différents types de catastrophes
2011
Projet consultable sur: http://geoazur.oca.eu/spip.php?article729IntroductionProjet consultable sur: http://geoazur.oca.eu/spip.php?article729Introduction
Analyser les catastrophes : une approche par les comportements humains
2011
La catastrophe est une forme de crise qui altère profondément un système social soumis à une situation de stress collectif. Ce dernier est confronté à une agression qui surpasse ses capacités d'adaptation induisant une désorganisation sociale et territoriale plus ou moins longue. L'environnement physique, qui influe peu sur les comportements observés en situation normale, contrairement à l'environnement social, impose de nouvelles façons d'agir, de nouveaux modes d'organisation, quelles que soient les échelles considérées. Il s'agit au moment du choc d'assurer sa survie et celle de ses proches (à condition qu'ils ne soient pas trop éloignés spatialement), puis une fois le danger écarté, de …
Population processes under the influence of disasters occurring independently of population size
1989
Markov branching processes and in particular birth-and-death processes are considered under the influence of disasters that arrive independently of the present population size. For these processes we derive an integral equation involving a shifted and rescaled argument. The main emphasis, however, is on the (random) probability of extinction. Its distribution density satisfies an equation which can be solved numerically at least up to a multiplicative constant. In an example it is also found by simulation.
Preliminary report on the microvertebrate faunal remains from the Late Triassic locality at Krasiejów, SW Poland
2019
Fossil vertebrate remains from the Keuper unit in the vicinity of the village of Krasiejów have been analyzed for almost two decades. However, the main goal of these works was focused mainly on large vertebrates. Here the authors present the first description of microvertebrate fossils from that site. The collection of around 5,000 specimens is mainly comprised of teeth and scales. The most numerous remains belong to osteichthyans: dipnoans (Ptychoceratodus and cf. Arganodus), palaeoniscids, semionotids, redfieldiids and chondrichthyans, such as Lonchidion sp., which is the first indisputable record of that genus in the Upper Triassic of Poland and the first shark at the Krasiejów locality.…