1. UPGRADING OF THE HP-5985A QUADRUPOLE MASS SPECTROMETER. Authors: N. LUPŞA, V. MIREL, A. PAMULA, N. PALIBRODA, ALINA N. NICA.2. POTENTIOSTATIC SYSTEM WITH DATA ACQUISITION FOR ELECTROCHEMICAL MEASUREMENTS. Authors: N. LUPŞA, GH. MIHĂILESCU, V. MIREL, ALINA N. NICA, A. PAMULA, STELA PRUNEANU.3. IMPROVEMENT OF ISOTOPE RATIO MASS SPECTROMETRY ANALYSIS BY CHANGING THE AMPLIFIER CHANNEL AND BY AUTOMATIC DATA ACQUISITION. Authors: N. LUPŞA, V. MIREL, STELA CUNA, ALINA N. NICA, ALEXANDRU CHIŞ.