INVESTIGATING THE POTENTIAL OF LOCALLY SOURCED PIEZOELECTRIC MATERIALS FOR ENERGY HARVESTING IN ANAMBRA STATE, NIGERIA. International Journal of Functional Research in Science and Engineering (IJFRSE) , [S. l.], v. 3, n. 4, p. 38–45, 2026. Disponível em: https://www.journalfrse.org/journal/article/view/100.. Acesso em: 13 mar. 2026.