Jamal Mohamad, F. A., Anita Ahmad, Ruzairi Abdul Rahim, Sallehuddin Ibrahim, Juliza Jamaludin, & Noorhazirah Sunar. (2025). The Identification of Optimal Frequency for Ultrasonic Transducers in Concrete-Defect Detection using COMSOL® Simulator. ELEKTRIKA- Journal of Electrical Engineering, 24(2), 104–110. https://doi.org/10.11113/elektrika.v24n2.589