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Characterization of miniature antenna for sub-GHz on-body applications
No full textInternational audienceIn this paper, a fast characterization technique for on-body small devices is presented. This method is used to extract the radiation performance of two different structures placed on a belt over a human abdomen at 868 MHz. Results show that the Planar Inverted F structure has a measured Mean Gain 7.65 dB higher than the planar IFA structure for the on-body scenario
Acceleration of the Macroscopic Contact Line of a Droplet Spreading on a Substrate after Interaction with a Particle
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Investigating Dynamic Triggering of Seismicity by Regional Earthquakes: The Case of the Corinth Rift (Greece)
No full textInternational audienceDynamic triggering has been commonly observed after large teleseismic events, but the physics behind it is still under debate. To broaden observations, we here focus on the dynamic triggering by regional earthquakes, that is, by events with magnitude lower than 6.2 at distances smaller than 600 km. The western part of the Corinth Rift (Greece) is characterized by intense seismic swarms and is therefore adapted to study such responses. The microseismicity rates before and after the transient perturbations are high enough to analyze 30 regional earthquakes out of the 59 occurring in 2013. More than 40% of those 30 events, including earthquakes with magnitude as small as 4.5, are associated with a significant seismicity rate increase. The triggerability primarily depends on the amplitude of the seismic waves. However, triggering is mainly observed when the seismic perturbations are orthogonal to the faults, which suggests that fluid pressurization is likely involved
Mathematical modeling of human behaviors during catastrophic events: stability and bifurcations
No full textThe aim of this paper is to present some mathematical results concerning the PCR system (Panic-Control-Reflex), which is a model for human behaviors during catastrophic events. This model has been proposed to better understand and predict human reactions of individuals facing a brutal catastrophe, in a context of an established increase of natural and industrial disasters. After stating some basic properties, that is positiveness, boundedness, and stability of the solutions, we analyze the transitional dynamic. We then focus on the bifurcation that occurs in the system, when one behavioral evolution parameter passes through a critical value. We exhibit a degeneracy case of a saddle-node bifurcation, in a larger context of classical saddle-node bi-furcations and saddle-node bifurcations at infinity, and we study the inhibition effect of higher order terms
Mindreading and Endogenous Beliefs in Games
No full textWe argue that a Bayesian explanation of strategic choices in games requires introducing a psychological theory of belief formation. We highlight that beliefs in epistemic game theory are derived from the actual choice of the players, and cannot therefore explain why Bayesian rational players should play the strategy they actually chose. We introduce the players’ capacity of mindreading in a game theoretical framework with the simulation theory, and characterise the beliefs that Bayes rational players could endogenously form in games. We show in particular that those beliefs need not be ratifiable, and therefore that rational players can form action-dependent beliefs
An improved lower bound for the maximal length of a multivector
No full textA new lower bound for the maximal length of a multivector is obtained. It is much closer to the best known upper bound than previously reported lower bound estimates. The maximal length appears to be unexpectedly large for -vectors, with n>2, since the few exactly known values seem to grow linearly with vector space dimension, whereas the new lower bound has a polynomial order equal to n-1 like the best known upper bound. This result has implications for quantum chemistry
Évaluation échocardiographique de la dysfonction ventriculaire droite au cours du syndrome de détresse respiratoire aigu
No full textIntroduction :Le cœur pulmonaire aigu (CPA) est une complication fréquente du syndrome de détresse respiratoire aigu (SDRA). Son incidence est de 22 % et est parfois associée à une surmortalité. Il est défini par un rapport de surfaces télédiastoliques droites / gauche supérieur à 0.6 et un septum paradoxal. La dysfonction systolique ventriculaire droite telle que définie par les recommandations de l’American Society of Echocardiography n’à pas été bien étudiée au cours du SDRA, en particulier concernant le strain de la paroi libre. L’objectif de l’étude est d’identifier la prévalence de dysfonction systolique ventriculaire droite et de CPA au cours du SDRA et d’évaluer l’effet du monoxyde d’azote (NOi) et du décubitus ventral.<br>Matériel et méthode :Nous avons inclus de manière prospective des patients en SDRA de gravité modérée à sévère et procédé à une standardisation de la ventilation et à la réalisation d’échocardiographie systématique en position demie-assise, avec NOi et en décubitus ventral. L’interprétation des échographies était réalisée en aveugle. Nous avons évalué la présence de cœur pulmonaire aigu, de dysfonction systolique ventriculaire droite par les critères classiques de cardiologie (RV-FAC, Index de Tei, TAPSE, Onde S) et par mesure du strain de la paroi libre ventriculaire droite.<br>Résultats :16 patients ont étés inclus. Trente-sept pourcent des patients étaient en SDRA sévère. La prévalence de cœur pulmonaire aigu était de 25% tandis qu’une dysfonction systolique était identifiée dans 37.5 % des cas par les critères cardiologiques classiques et 68.7 % des cas par la mesure du strain qui semble être le critère le plus sensible pour identifier une dysfonction systolique ventriculaire droite.Le CPA n’était pas systématiquement associé à une dysfonction systolique ventriculaire droite et était même associé à une absence de choc, d’insuffisance rénale aigue ou d’élévation du BNP. Le strain de la paroi libre ventriculaire droite était aussi significativement amélioré par l’administration de NOi (-15.6% vs -18.2 % ; p = 0.001) et le décubitus ventral (-15.6% vs -23.5% ; p = 0.005) de sorte que seulement 36.3% des patients avaient une dysfonction systolique en décubitus ventral.<br>Conclusion :La dysfonction systolique ventriculaire droite était plus identifiée par les critères cardiologiques classiques que par la constatation d’un CPA. Le strain de la paroi libre ventriculaire droite était le critère le plus sensible. L’impact sur la morbi-mortalité de la dysfonction systolique ventriculaire droite doit être évalué sur une cohorte plus importante
Nanoparticle Doping of Optical Fibers – Can Silica Behave like a Fluoride?
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Regionalization of a Landscape-Based Hazard Index of Malaria Transmission: An Example of the State of Amapá, Brazil
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Analogues of Cliques for (m,n)-colored Mixed Graphs
No full textInternational audienceAn (m,n)-colored mixed graph is a mixed graph with arcs assigned one of m different colors and edges one of n different colors. A homomorphism of an (m,n)-colored mixed graph G to an (m,n)-colored mixed graph H is a vertex mapping such that if uv is an arc (edge) of color c in G, then f(u)f(v) is also an arc (edge) of color c. The (m,n)-colored mixed chromatic number, denoted chi_{m,n}(G), of an (m,n)-colored mixed graph G is the order of a smallest homomorphic image of G. An (m,n)-clique is an (m,n)-colored mixed graph C with chi_{m,n}(C) = |V(C)|. Here we study the structure of (m,n)-cliques. We show that almost all (m,n)-colored mixed graphs are (m,n)-cliques, prove bounds for the order of a largest outerplanar and planar (m,n)-clique and resolve an open question concerning the computational complexity of a decision problem related to (0,2)-cliques. Additionally, we explore the relationship between chi_{1,0} and chi_{0,2}