École Polytechnique

An Introduction To Compressive Sampling

Conventional approaches to sampling signals or images follow Shannon's theorem: the sampling rate must be at least twice the maximum frequency present in the signal (Nyquist rat...

New dimensions at a millimeter to a fermi and superstrings at a TeV

Adaptive greedy approximations

Spectral Segmentation with Multiscale Graph Decomposition

We present a multiscale spectral image segmentation algorithm. In contrast to most multiscale image processing, this algorithm works on multiple scales of the image in parallel,...

Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope

We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two...

Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope

The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of ...

Carbon cycling under 300 years of land use change: Importance of the secondary vegetation sink

We have developed a dynamic land model (LM3V) able to simulate ecosystem dynamics and exchanges of water, energy, and CO 2 between land and atmosphere. LM3V is specifically desi...

Conversion of Light into Electricity with Trinuclear Ruthenium Complexes Adsorbed on Textured TiO₂ Films

Abstract A series of CN‐bridged trinuclear Ru complexes of the general structure [RuL 2 (μ‐(CN)Ru(CN)L 2 ′) 2 ] where L is 2,2′‐bipyridine‐4,4′‐dicarboxylic acid and L′ is 2,2′‐...

Functional repertoire convergence of distantly related eukaryotic plankton lineages abundant in the sunlit ocean

Mesure de Lebesgue et Nombre de Rotation