derniers depôts

Ajouté le 30/09/2020

The motivation of this work is to better understand the dynamic behaviour of bistable structures presenting an analogy with regularized Ericksen bars.

Ajouté le 30/09/2020

Workers' propensity to migrate to another local labor market varies a lot by occupation. We use the model developed by ? to quantify the impact of mobility costs and search frictions on this mobility gap.

Ajouté le 30/09/2020

New instruments to characterize vegetation must meet cost constraints while providing accurate information. In this paper, we study the potential of a laser speckle system as a low-cost solution for non-destructive phenotyping. The objective is to assess an original approach combining laser speckle with chemometrics to describe scattering and absorption properties of sunflower leaves, related to their chemical composition or internal structure.

Ajouté le 29/09/2020

A new formulation is presented here for the existence and calculation of nonlinear normal modes in undamped nonlinear autonomous mechanical systems. As in the linear case an expression is developed for the mode in terms of the amplitude, mode shape and frequency, with the distinctive feature that the last two quantities are amplitude and total phase dependent. The dynamic of the periodic response is defined by a one-dimensional nonlinear differential equation governing the total phase motion.

Ajouté le 29/09/2020

The aim of this paper is to show how the concept of nonlinear modes can be used to characterize periodic orbits and limit cycles in multi-degree-of-freedom nonlinear mechanical systems. In line with previous studies by Shaw and Pierre, the concept of nonlinear modes is introduced here in the framework of invariant manifold theory for dynamical systems.

Ajouté le 29/09/2020

We analyze risk-taking regulation when financial institutions are linked through shareholdings. We model regulation as an upper bound on institutions' default probability, and pin down the corresponding limits on risk-taking as a function of the shareholding network.

Ajouté le 29/09/2020

Polycyclic codes are a powerful generalization of cyclic and constacyclic codes. Their algebraic structure is studied here by the theory of invariant subspaces from linear algebra. As an application, a bound on the minimum distance of these codes is derived which outperforms, in some cases, the natural analogue of the BCH bound.

Ajouté le 28/09/2020

Structured-Gaussian beams are shown to be fully and uniquely represented by a collection of points (or a constellation) on the surface of the modal Majorana sphere, providing a complete generalization of the modal Poincaré sphere to higher-order modes. The symmetries of this Majorana constellation translate into invariances to astigmatic transformations, giving way to continuous or quantized geometric phases.

Ajouté le 28/09/2020

La chlordécone est un insecticide organochloré de la famille des bishomocubanes, responsable de troubles neurologiques et de la reproduction chez l’homme, dont la fabrication et l’utilisation ont été interdites aux USA en 1976, mais qui a continué à être employée dans les Antilles françaises pour lutter contre le charançon du bananier jusqu’en 1993.

Ajouté le 26/09/2020

A (t, n)−secret sharing scheme is a method of distribution of information among n participants such that any t > 1 of them can reconstruct the secret but any t − 1 cannot. A ramp secret sharing scheme is a relaxation of that protocol that allows that some (t − 1)-coalitions could reconstruct the secret. In this work, we explore some ramp secret sharing schemes based on quotients of polynomial rings. The security analysis depends on the distribution of zero-sum sets in abelian groups.

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