J/psi production as a function of charged-particle pseudorapidity density in p-Pb collisions at root s(NN)=5.02 TeV

We report measurements of the inclusive J/ψ yield and average transverse momentum as a function of charged-particle pseudorapidity density dNch/dη in p–Pb collisions at sNN=5.02TeV with ALICE at the LHC. The observables are normalised to their corresponding averages in non-single diffractive events. An increase of the normalised J/ψ yield with normalised dNch/dη, measured at mid-rapidity, is observed at mid-rapidity and backward rapidity. At forward rapidity, a saturation of the relative yield is observed for high charged-particle multiplicities. The normalised average transverse momentum at forward and backward rapidities increases with multiplicity at low multiplicities and saturates beyond moderate multiplicities. In addition, the forward-to-backward nuclear modification factor ratio is also reported, showing an increasing suppression of J/ψ production at forward rapidity with respect to backward rapidity for increasing charged-particle multiplicity

Dehydration–rehydration characteristics of Nafion-H, Nafion-H supported on silica and Nafion-H silica nanocomposite catalysts studied by Infrared Microscopy

Dehydration-rehydration characteristics of Nafion-H, silica-supported Nafion-H and two types of Nafion-H silica nanocomposites were studied by infrared microscopy working in the reflectance mode. The as received as well as the variously pretreated samples (evacuation at 298, 378 and 423 K) and the rehydrated samples were investigated in the mid IR range. Reversible changes in the OH region of the supported and the composite substances were observed depending on the temperature of pretreatment. Pretreatment at 423 K lead to more extensive changes in Nafion-H, i.e., to the loss of certain amount of -SO(2)OH groups through irreversible desulfonation/dehydroxylation