derniers depôts

Ajouté le 19/06/2019

We prove that the existence of exceptional real zeroes of Dirichlet $L$-functions would lead to cancellations in the sum $\sum_{p\leq x} \Kl(1, p)$ of Kloosterman sums over primes, and also to sign changes of ${\rm Kl}(1, n)$, where $n$ runs over integers with exactly two prime factors. Our arguments involve a variant of Bombieri's sieve, bounds for twisted sums of Kloosterman sums, and work of Fouvry and Michel on sums of $\left| {\rm Kl}(1, n)\right|$.

Ajouté le 19/06/2019

En spectroscopie RMN, l'analyse et la distinction de différentes entités chimiques dans un mélange donné avec les techniques de séparation aveugle de source représente un objectif en plein essor que nous traitons dans ce travail. La précision et la pertinence demandées dans ce domaine nécessitent des approches de séparation de sources avancées.

Ajouté le 18/06/2019

In this paper, Direct Numerical Simulations (DNS) are carried out in order to capture the flow instabilities and transition to turbulence occurring on a Savonius style wind turbine (SSWT) blade. Simulations are conducted with the open source code NEK5000, solving the incompressible Navier-Stokes equations with a high order, spectral element method.

Ajouté le 18/06/2019

Under Loss Of Coolant Accident (LOCA) conditions, the temperature evolution within the fuel pellets combined with a reduction of the cladding confinement can lead to fuel fragmentation. This phenomenon provides additional fission gas release, inducing a higher rod internal pressure and possibly an additional driving force to disperse the smallest fuel fragments out of the cladding when the cladding balloons and bursts.

Ajouté le 18/06/2019

The interfaces between the bituminous pavement layers represent a very important parameter for the computational and design of these structures. However, the bonding quality depends on binder properties, adhesion state and surface cleanliness [1]. Some research [2] [3] shows the influence of the surface roughness between the different layers on the mechanical behavior of the interfaces in these structures.

Ajouté le 18/06/2019

The present work aims at determining a micromechanical model for the elastoplastic behavior of anisotropic metal-matrix composites reinforced by aligned inclusions. The microstructure of the studied material – hydrided and irradiated Zircaloy-4 cladding tubes – is supposed to be made of an anisotropic and elastoplastic matrix (irradiated Zircaloy) containing aligned isotropic elastic inclusions (hydrides).

Ajouté le 18/06/2019

Background: The functional determinants of H3K4me3, their potential dependency on histone H2B monoubiquitination, and their contribution to defining transcriptional regimes are poorly defined in plant systems. Unlike in Saccharomyces cerevisiae, where a single SET1 protein catalyzes H3K4me3 as part of COMPlex of proteins ASsociated with Set1 (COMPASS), in Arabidopsis thaliana, this activity involves multiple histone methyltransferases.

Ajouté le 18/06/2019

In this work, we are interested in unmixing complex mixtures based on Nuclear Magnetic Resonance spectroscopy spectra. More precisely, we propose to solve a 2D blind source separation problem where signals (spectra) are highly sparse. The separation is formulated as a nonnegative matrix factorization problem that is solved using a block coordinate proximal gradient algorithm involving various sparse regularizations.

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