فهرس المقالات Functionally graded double-layer Piezoelectric plate حرية الوصول المقاله صفحة الملخص نص كامل 1 - The Effect of Modified Couple Stress Theory on Buckling and Vibration Analysis of Functionally Graded Double-Layer Boron Nitride Piezoelectric Plate Based on CPT M Mohammadimehr M Mohandes