ARSAN GROUP BORDRILL CPE-UAET DELTA INT DR. HASAN ÖZGÜR YILDIZ DR. MUSTAFA ONUR GEOS ENERGY GÜNEY YILDIZI PETROL ITU FACULTY OF MINES ITU RECTORATE MB HOLDING NTU GEOTHERMAL CONSULTING PEGİ TEKNİK TP VIKING SERVICES ZORLU ENERGY