Issue N°2 / 2023 ForewordAim and Scope Editorial BoardsTime Frequency Analysis of Experimental Ultrasonic NDT SignalsSamira DIB, Fares DJERFI, Toufik BOUDEN1Regulation of HV Grid Connected to a 250 kW Photovoltaic Power PlantNasreddine ATTOU, Sid-Ahmed ZIDI, Samir HADJERI, Mohamed KHATIR11 The impact of changing lightning step leader position on the performance of LPS (lightning protection system) for wind turbinesAbdelbari YOUNES, Abdenbi MIMOUNI19Dielectric Strength of Some Vegetable Oils and Vegetable-based mixturesMama TALHI, Malika TALHI, Karima Amel MECHKEN, Mohammed Said DAINES, Charaf Eddine Mounir KALAKHI, Issouf FOFANA28Mitigation of magnetic pollution generated by subsea cable on fishIlyes REZZAG BARA, Ahmed Nour El Islam AYAD, T. ROUIBAH, Wafa KRIKA, AYAD Abdelghani and Salah-Eddine BENDIMERAD33