1. PREPARATION AND CHARACTERIZATION OF MANGANESE DOPED ZINC SULPHIDE NANOCRYSTALLINE POWDERS WITH LUMINESCENT PROPERTIES. Authors: ADRIAN-IONUŢ CADIŞ, ADRIAN RAUL TOMŞA, ECATERINA BICA, LUCIAN BARBU TUDORAN, LUMINIŢA SILAGHI-DUMITRESCU, ELISABETH-JEANNE POPOVICI.2. SPECTROSCOPIC AND STRUCTURAL CHARACTERISATION OF SiO2 -Y2O3 BASED MATERIALS WITH LUMINESCENT PROPERTIES. Authors: EMIL INDREA, MARIUS MORAR, ADRIAN-IONUŢ CADIŞ, ECATERINA BICA, ELISABETH-JEANNE POPOVICI, LAURA ELENA MUREŞAN.3. STUDIES ON THE SYNTHESIS OF MANGANESE DOPED ZINC SULPHIDE NANOCRYSTALLINE POWDERS. Authors: LUCIAN BARBU TUDORAN, ECATERINA BICA, ELISABETH-JEANNE POPOVICI, ADRIAN-IONUŢ CADIŞ.