Search results for "Oise"
showing 10 items of 1967 documents
Resonant activation in piecewise linear asymmetric potentials
2011
7 páginas, 8 figuras.-- PACS number(s): 05.40.−a, 05.45.−a, 02.50.Ey
Dynamics of a Lotka-Volterra system in the presence of non-Gaussian noise sources
2009
We consider a Lotka-Volterra system of two competing species subject to multiplicative α-stable Lévy noise. The interaction parameter between the species is a random process which obeys a stochastic differential equation with a generalized bistable potential in the presence both of a periodic driving term and an additive alpha-stable Lévy noise. We study the species dynamics, which is characterized by two different dynamical regimes, exclusion of one species and coexistence of both ones, analyzing the role of the Lévy noise sources.
The crowd against the few: Measuring the impact of expert recommendations
2020
Abstract A large amount of research on recommender systems has focused on improving the accuracy of suggestions in offline settings. However, this focus and the commonly used techniques can lead to a “filter bubble”, severely limiting the diversity of content discovered by users. Several offline studies show that this can be mitigated by using experts for recommendation. In contrast to standard recommender systems, experts are able to generate more diverse recommendations and increase the novelty of given suggestions. They can be used in missing-data or cold-start scenarios and reduce noise in the users' ratings. This paper examines the impact of employed experts' recommendations on user be…
Multiplicative cases from additive cases: Extension of Kolmogorov–Feller equation to parametric Poisson white noise processes
2007
Abstract In this paper the response of nonlinear systems driven by parametric Poissonian white noise is examined. As is well known, the response sample function or the response statistics of a system driven by external white noise processes is completely defined. Starting from the system driven by external white noise processes, when an invertible nonlinear transformation is applied, the transformed system in the new state variable is driven by a parametric type excitation. So this latter artificial system may be used as a tool to find out the proper solution to solve systems driven by parametric white noises. In fact, solving this new system, being the nonlinear transformation invertible, …
Factors affecting flavor perception in space: Does the spacecraft environment influence food intake by astronauts?
2020
International audience; The intention to send a crewed mission to Mars involves a huge amount of planning to ensure a safe and successful mission. Providing adequate amounts of food for the crew is a major task, but 20 years of feeding astronauts on the International Space Station (ISS) have resulted in a good knowledge base. A crucial observation from the ISS is that astronauts typically consume only 80% of their daily calorie requirements when in space. This is despite daily exercise regimes that keep energy usage at very similar levels to those found on Earth. This calorie deficit seems to have little effect on astronauts who spend up to 12 months on the ISS, but given that a mission to …
Noise Induced Phenomena in Lotka-Volterra Systems
2003
We study the time evolution of two ecosystems in the presence of external noise and climatic periodical forcing by a generalized Lotka-Volterra (LV) model. In the first ecosystem, composed by two competing species, we find noise induced phenomena such as: (i) quasi deterministic oscillations, (ii) stochastic resonance, (iii) noise delayed extinction and (iv) spatial patterns. In the second ecosystem, composed by three interacting species (one predator and two preys), using a discrete model of the LV equations we find that the time evolution of the spatial patterns is strongly dependent on the initial conditions of the three species.
Le structuralisme militant
2018
Affermando la fecondità dello strutturalismo per pensare le relazioni di parentela o la differenza tra i sessi, Françoise Héritier ha profondamente rinnovato i metodi dell’antropologia. La studiosa ha mostrato altresì che il suo impegno scientifico si è svolto parallelamente alla sua implicazione politica. En affirmant la fécondité du structuralisme pour penser les relations de parenté ou la différence entre les sexes, Françoise Héritier a profondément renouvelé les méthodes de l’anthropologie. Elle a aussi montré que l’engagement scientifique allait de pair avec une implication dans la cité.
Françoise Héritier ou l’étique par la méthode
2018
« Il faut franchir de hauts barrages pour faire comprendre que ce dont nous parlons ne refere pas a des Autres totalement exotiques, etrangers a nous-memes, a des mentalites archaiques, a des modes de vie disparus, ni meme a des survivances, mais a nous-memes, a notre propre societe, a nos propres reactions, comportements et representations » Francoise Heritier. Francoise Heritier s’est eteinte a l’hopital de la Pitie-Salpetriere a Paris le 15 novembre 2017, exactement le jour de sa naissance...
Cahier Françoise Héritier
2018
à travers une mosaïque de points de vue, la complexité de la pensée de Françoise Héritier est interrogée
Avant-propos
2018
Prefazione al volume: Cahier de L’Herne dedicato a Françoise Héritier recentemente scomparsa Préface du volume: Cahier de L’Herne dédié à Françoise Héritier décédée récemment