1. DIELECTRIC BEHAVIOR OF SLUDGE FROM WASTEWATER TREATMENT. Authors: CSABA BARTHA, ALINA CARAMITU, MONICA JIPA, DANIELA MARIA IGNAT, ATTILA TÓKOS.2. BEHAVIOR IN AC POLARIZATION OF HIGH-SILICON CAST IRONS. Authors: CSABA BARTHA, VIRGIL MARINESCU, MONICA JIPA, BEATRICE-GABRIELA SBARCEA, ATTILA TÓKOS, ALINA-RUXANDRA CARAMITU, IOSIF LINGVAY.