Density of states in high- T(c) superconductor vortices.

We calculated the electronic structure of a vortex in a pseudogapped superconductor within a model featuring strong correlations. With increasing strength of the correlations, the BCS core states are suppressed and the spectra inside and outside the core become similar. If the correlations are short range, we find new core states in agreement with the observations in YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+delta. Our results point to a common phenomenology for these two systems and indicate that normal-state correlations survive below T(c) without taking part in the overall phase coherence.

[Perspectives of atmospheric pollution]. / Perspectives de la pollution atmosphérique.

We describe briefly a new method for the analysis and forecast of energy consumption and apply this method to estimate the future emissions of the atmospheric pollutants SO2 and NOx. Our results show that the level of SO2 emissions will quickly go down to 1960 levels, but that the NOx emissions remain disturbingly high for the foreseeable future.