Laboratoire d'Informatique de l'École Polytechnique

TiO 2 as Trap Sensitizer for Enhanced Persistent Luminescence in ZnGa 2 O 4 :Cr 3 + Nanoparticles

ABSTRACT Enhancing the charging efficiency of persistent luminescence materials remains a key challenge for their practical implementation. Here, we report a hybrid strategy based on coupling ZnGa 2 O 4 :Cr 3 + nanoparticles with TiO 2 through a porous SiO 2 interlayer to promote...

Velocity averaging lemmas: classical, quantum and semi-classical

Averaging lemmas were introduced as a tool of the mathematical analysis of kinetic equations, i.e. PDEs for functions in phase space ( x , v ) containing a transport (“advection”) term. By integrating over v in velocity space ℝ v d (velocity averaging), one gains regularity for t...

A hybrid combinatorial-continuous strategy for solving molecular distance geometry problems

Abstract The Molecular Distance Geometry Problem is essential to structural biology, as it seeks to determine three-dimensional protein structures from partial interatomic distances. Its discretizable subclass (DMDGP) admits an exact combinatorial formulation that enables efficie...

Betti Numbers and Higher Weight Spectra of Reed–Muller Codes \({\textrm{RM}}_{{q}}{(2,2)}\)

Abstract. We determine all the Betti numbers of the [Formula: see text]-ary second order Reed–Muller codes of length [Formula: see text], and also of the elongations of matroids associated to these codes. We then use it to determine the higher weight spectra of these codes. As a...

Evidence for the impact of fire activity on daily variations of IASI mid-tropospheric CO 2 anomalies at 8–11 km over South America: a pyroconvective fingerprint

Biomass burning is a major, highly variable source of atmospheric CO 2 , but its impact on the free troposphere remains difficult to quantify because of uncertainties in injection heights and transport. In the tropics, intense fires can trigger pyroconvective plumes that loft com...

Evaluation of ASCAT soil moisture retrievals and their potential to detect intraday variability

Accurate sub-daily soil moisture (SM) retrievals from satellite observations remain a major challenge due to sparse temporal sampling and retrieval uncertainties. This study introduces a localized convolutional neural network (CNN-l) framework designed to enhance SM estimates fro...

Strong coupling between RF photons and plasmons of electrons on liquid helium

Plasmons, arising from the collective motion of electrons, can interact strongly with electromagnetic fields or photons; this capability has been exploited across a broad range of applications, from chemical reactivity to biosensing. Recently, there has been growing interest in p...

Resource competition between buoyancy‐regulating and sinking phytoplankton species along a stratified water column

Abstract In temperate lakes plankton dynamics are closely linked to seasonal shifts in water stratification, following air temperature. The onset of summer stratification typically coincides with spring bloom for-mation of algae in the well mixed surface layer (epilimnion). Howev...