Réseaux sociaux :

# derniers depôts

Ajouté le 24/07/2019

## [hal-02190653] Un duo gagnant pour la catalyse rédox

L'utilisation conjointe des mesures expérimentales et des modélisations théoriques constitue un outil pertinent pour étudier les propriétés moléculaires de systèmes catalytiques complexes impliquant des ligands non inno-cents. Cette approche combinée va permettre de déterminer la structure électronique des espèces mises en jeu au cours des réactions redox dans le but de comprendre, de rationaliser et d'optimiser leurs performances catalytiques.

Ajouté le 25/07/2019

## [hal-02191296] A Thiosemicarbazone-Nickel(II) Complex as Efficient Electrocatalyst for Hydrogen Evolution

Dedicated in memory of Prof. Constantin Turta for his outstanding contribution to inorganic and coordination chemistry Abstract: We report herein on of the synthesis and characterization of a new mononuclear nickel complex NiL based on a thiosemicarbazone ligand that exhibits an electrocatalytic behavior for H2 evolution in DMF using trifluoroacetic acid (TFA) as the proton source.

Ajouté le 23/07/2019

## [hal-02190039] AMPLENESS OF SCHUR POWERS OF COTANGENT BUNDLES AND p-HYPERBOLICITY

Brotbek--Darondeau and Xie independently proved that sufficiently generic complete intersections in projective spaces whose dimension are at least equal to their codimension have ample cotangent bundle. In this paper, we study the ampleness of Schur powers of cotangent bundles of generic complete intersections in projective spaces, and present some applications in hyperbolicity.

Ajouté le 23/07/2019

## [hal-02187320] On the scalar complexity of Chudnovsky multiplication algorithm in finite fields

We propose a new construction for the multiplication algorithm of D.V. and G.V. Chudnovsky in order to improve scalar algebraic complexity. In particular, we improve the Baum-Shokrollahi construction for multiplication in F256/F4 based on the elliptic Fermat curve x 3 + y 3 = 1.

Ajouté le 23/07/2019

## [hal-02190650] Efficient Light-Driven Hydrogen Evolution Using a Thiosemicarbazone-Nickel (II) Complex

In the following work, we carried out a systematic study investigating the behavior of a thiosemicarbazone-nickel (II) complex (NiTSC-OMe) as a molecular catalyst for photo-induced hydrogen production. A comprehensive comparison regarding the combination of three different chromophores with this catalyst has been performed, using [Ir(ppy) 2 (bpy)]PF 6 , [Ru(bpy) 3 ]Cl 2 and [ZnTMePy]PCl 4 as photosensitizers.

Ajouté le 20/07/2019

## [hal-01672898] Strain gradient and generalized continua obtained by homogenizing frame lattices

We determine the effective behavior of periodic structures made of welded elastic bars. Taking into account the fact that flexural and torsional stiffnesses are much smaller than the extensional one we overpass classical homogenization formula and obtain totally different types of effective energies. We work in the framework of linear elasticity.

Ajouté le 20/07/2019

## [hal-02188761] External sound field simulations and measurements of woodwind resonators

The input impedance is a useful quantity to characterize the acoustic response of woodwind instruments and is efficiently simulated using the Transfer Matrix Method (TMM). However, the TMM does not calculate intermediate variables that are convenient for simulating the external sound field.

Ajouté le 20/07/2019

## [hal-02189163] Manipulation expérimentale de la cohérence temporelle d'ondes partiellement cohérentes

Nous décrivons deux expériences nous permettant de manipuler les propriétés de cohérence d'ondes partiellement cohérentes. Les montages expérimentaux développés reposent sur la manipulation de la phase spectrale du champ initial, assistée éventuellement d'une modulation sinusoïdale préalable de sa phase temporelle. Les signaux d'autocorrélation en intensité mesurés soulignent le changement significatif des caractéristiques temporelles des signaux incohérents obtenus.

Ajouté le 20/07/2019

## [hal-02189191] Partial sums of the cotangent function

We prove the existence of reciprocity formulae for sums of the form $\sum_{m=1}^{k-1}f\pr{\frac{m}{k}}\cot\pr{\pi \frac{m h}k}$ where $f$ is a piecewise~$C^1$ function, featuring an alternating phenomenon not visible in the classical case where~$f(x)=x$. We deduce bounds for these sums in terms of the continued fraction expansion of~$h/k$.

Ajouté le 23/07/2019

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