Baryon fraction in clusters, combined with constraints from primordial nucleosynthesis is currently used to provide a robust upper limit on the cosmological density parameter Ω 0. Current analyses lead to gas fractions at virial radius which are typically of the order of 0.20h −3/2 50 , favoring a low density universe. In this work, we examine critically this issue through the analysis of the b...

The application of atypical experimental methods such as conductivity measurements, optical microscopy, and nonstirred polymerizations to investigations of the 'classical' batch ab initio emulsion polymerization of styrene revealed astonishing facts. The most important result is the discovery of spontaneous emulsification leading to monomer droplets even in the quiescent styrene in water system...

When impinging on optical structures or passing in their vicinity, free electrons can spontaneously emit electromagnetic radiation, a phenomenon generally known as cathodoluminescence. Free-electron radiation comes many guises: Cherenkov, transition, and Smith–Purcell but also electron scintillation, commonly referred to incoherent While those effects have been at the heart of fundamental disco...