1. ECOLOGICAL SYSTEM FOR WASTE FORMING SANDS IN FOUNDRIES RECYCLING. Authors: VIOREL DAN, OVIDIU NEMEŞ, VASILE-FILIP SOPORAN.2. RESEARCHES ON THE REVALUATION OF THE USED SANDS FROM THE INDUSTRIAL WASTES IN THE COMPOSITION OF CONCRETE. Authors: HENRIETTE SZILAGYI, VALER MICLE, VIOREL DAN, DANA MIOARA BODA.3. THERMAL BEHAVIOUR OF POLYURETHANE MATRIX COMPOSITE MATERIALS. Authors: OVIDIU NEMEŞ, VIOREL DAN.