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Search Results: 1 - 10 of 366547 matches for " Bernard Mercier de Lépinay "
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Volcano-tectonic interactions revealed by inversion of focal mechanisms: stress field insight around and beneath the Vatnaj?kull ice cap in Iceland
Romain Plateaux,Nicole Béthoux,Fran?oise Bergerat,Bernard Mercier de Lépinay
Frontiers in Earth Science , 2014, DOI: 10.3389/feart.2014.00009
Abstract: Volcano-tectonic processes in the central part of Iceland, covered by the Vatnaj?kull glacier, are investigated by inversion of focal mechanisms. Working on a large catalog of focal mechanisms determined by the Icelandic Meteorological Office (IMO), we used a damped regional-scale stress inversion method to obtain an insight of kilometric variations of the stress field. To evaluate the resolution and the stability of this stress field solution, we computed checkerboard tests, stress field models and error propagation tests. Stress field models showed a continuous stress regime between normal and strike-slip faulting, associated with a high stress shape ratio (i.e., σ1 ≈ σ2). Two main directions of σhmin were evidenced: the first one was in agreement with the regional spreading direction of Iceland and the second one was deviated, being almost perpendicular to the first one. The deviated stress direction is sustained through the 20 year time-span of the study around the Bárearbunga and Grimsv?tn central volcanoes while the spreading direction remains predominant around the Hamarinn volcano. This result supports the hypothesis that this volcano lacks collapse caldera and shares a fissure swarm with the larger Bárearbunga volcano. On a smaller temporal scale, during the 1996 volcanic crisis, a bimodal distribution of σhmin showed two opposite strike-slip regimes where the deviated direction dominated. Because these two states of stress T1 and T2 show stress regimes away from the Andersonian positions, P, B, and T axes, the rapid flip between these two regimes may be associated with the progressive melt intrusion of a dyke.
Observation of a phononic Mollow triplet in a hybrid spin-nanomechanical system
Benjamin Pigeau,Sven Rohr,Laure Mercier de Lépinay,Arnaud Gloppe,Vincent Jacques,Olivier Arcizet
Physics , 2015, DOI: 10.1038/ncomms9603
Abstract: Reminiscent of the bound character of a qubit's dynamics confined on the Bloch sphere, the observation of a Mollow triplet in the resonantly driven qubit fluorescence spectrum represents one of the founding signatures of Quantum Electrodynamics. Here we report on its observation in a hybrid spin-nanomechanical system, where a Nitro-gen Vacancy spin qubit is magnetically coupled to the vibrations of a Silicon Carbide nanowire. A resonant microwave field turns the originally parametric hybrid interac-tion into a resonant process, where acoustic phonons are now able to induce transitions between the dressed qubit states, leading to synchronized spin-oscillator dynamics. We further explore the vectorial character of the hybrid coupling to the bidimensional de-formations of the nanowire. The demonstrated microwave assisted synchronization of the spin-oscillator dynamics opens novel perspectives for the exploration of spin-dependent forces, the key-ingredient for quantum state transfer.
Nano-optomechanical measurement in the photon counting regime
Laure Mercier de Lépinay,Benjamin Pigeau,Sven Rohr,Arnaud Gloppe,Aurélien Kuhn,Pierre Verlot,Eva Dupont-Ferrier,Benjamin Besga,Olivier Arcizet
Physics , 2015,
Abstract: Optically measuring in the photon counting regime is a recurrent challenge in modern physics and a guarantee to develop weakly invasive probes. Here we investigate this idea on a hybrid nano-optomechanical system composed of a nanowire hybridized to a single Nitrogen-Vacancy (NV) defect. The vibrations of the nanoresonator grant a spatial degree of freedom to the quantum emitter and the photon emission event can now vary in space and time. We investigate how the nanomotion is encoded on the detected photon statistics and explore their spatio-temporal correlation properties. This allows a quantitative measurement of the vibrations of the nanomechanical oscillator at unprecedentedly low light intensities in the photon counting regime when less than one photon is detected per oscillation period, where standard detectors are dark-noise-limited. These results have implications for probing weakly interacting nanoresonators, for low temperature experiments and for investigating single moving markers.
Pleyers Geoffrey, Alter-Globalization
Clara Carbunar,Ivan de Lépinay,Angela Erazo,Hira Kaynar
Recherches Sociologiques et Anthropologiques , 2011,
Abstract: Comment être acteur dans la mondialisation ? Voici la question principale relevée par cet ouvrage qui s’intéresse à la capacité d’agir des citoyens à l’heure de la mondialisation. Dès l’amorce de son exposé, Pleyers dessine les traits du mouvement altermondialiste et nous explique sa portée. Réuni autour de la dénonciation des politiques internationales néolibérales, le mouvement altermondialiste appara t caractérisé par son foisonnement d’initiatives, mais aussi de cultures et pratiques mili...
Preliminary Study of the Tracks of Captive Otters (Lutra Lutra) as a Tool for Field Research
Mercier L.,Fried G.
IUCN Otter Specialist Group Bulletin , 2004,
Abstract: For several years, spraints and prints have allowed the presence of Eurasian Otters, Lutra lutra, to be established in a non-invasive way. Prints are very variable, even from the same individual, depending on the substrate: snow, sand, silt etc. This preliminary study defines a statistical formula to allow estimation of whether a hind paw print on clay or mud belongs to a male or female, using seven biometric parameters. A database of measurements from animals in various zoos could be created, which could then be used in situ to allow the field researcher to know a little more on the otters creating the prints - sex, possible age and so on.
Conservation laws with a non-local flow application to pedestrian traffic
Lécureux-Mercier Magali
ESAIM : Proceedings , 2013, DOI: 10.1051/proc/201238023
Abstract: In this note, we introduce some models of pedestrian traffic and prove existence and uniqueness of solutions for these models. On présente ici différents modèles de trafic piéton et on prouve l’existence et l’unicité des solutions pour ces modèles.
Improved stability estimates on general scalar balance laws
Magali Lécureux-Mercier
Mathematics , 2010,
Abstract: Consider the general scalar balance law $\partial_t u + \mathrm{Div} f(t, x, u) = F(t, x, u)$ in several space dimensions. The aim of this note is to improve the results of Colombo, Mercier, Rosini who gave an estimate of the dependence of the solutions from the flow f and from the source F. The improvements are twofold: first the expression of the coefficients in these estimates are more precise; second, we eliminate some regularity hypotheses thus extending significantly the applicability of our estimates.
Conservation laws with a nonlocal flow, Application to pedestrian traffic
Magali Lécureux-Mercier
Mathematics , 2011,
Abstract: In this note, we introduce some models of pedestrian traffic and prove existence and uniqueness for these models.
A priori estimates and analytical construction of radially symmetric solutions in the gas dynamics
Magali Lécureux-Mercier
Mathematics , 2013,
Abstract: In this article we derive C^1-a priori estimates on the Riemann invariants of the Euler compressible equations in the case of cylindrical or spherical symmetry. These estimates allow then to construct shock waves with a time of existence proportional to the distance to the origin at the initial time.
Uso da maconha e suas representa??es sociais: estudo comparativo entre universitários
Coutinho, Maria da Penha de L.;Araújo, Ludgleydson Fernandes de;Gontiès, Bernard;
Psicologia em Estudo , 2004, DOI: 10.1590/S1413-73722004000300015
Abstract: the purpose of this research was to compare the social representations of university students who are getting their degree in the technological, health and law areas, on the use of marijuana. sixty (60) university students took part in this research, both sexes, aged from 22 to 30 years old. semi-structured interviews were used and the collected material was categorized through the analysis of content by bardin′s theme (1977). the collected data obtained among the university students made the consensual representations possible and particularity according to the field of professional performance. the law students showed their representations based on legal and social questions; the health students on the organic-medical and psychosocial conception, and the technological ones their representations in psychosocial elements. it has been concluded that there is the necessity of formulating the strategies which give data (support/information) in the professional formation, mainly the health and law areas which will be applied in their future practices of intervention with drug users and their families, as well as the implementation of public policies of education and health promotion.
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