1. EX-SITU PORTABLE X-RAY FLUORESCENCE SPECTROMETRY FOR THE MAJOR ELEMENTS DETERMINATION IN SILICATE GEOLOGICAL SAMPLES USING MATRIX-MATCHING STANDARDS FOR CALIBRATION. Authors: ANAMARIA IULIA TÖRÖK, CLAUDIU TĂNĂSELIA, CECILIA ROMAN, FERENC PUSKAS, MARIN SENILA.2. SUBMICRON AIRBORNE DUST PARTICLE MONITORING SYSTEM. Authors: CECILIA ROMAN, MARIUS ROMAN, LUCIAN DORDAI, ENIKO KOVACS, MARIA-ALEXANDRA HOAGHIA, FERENC PUSKAS.