Expression of Concern: Optimizing Mechanical Performance of AgC-Reinforced Polymer Nanocomposites: A Quantitative Analysis of Stiffness–Ductility Trade-offs. Babylonian Journal of Mechanical Engineering, [S. l.], v. 2026, p. 4–4, 2026. DOI: 10.58496/BJME/2026/004. Disponível em: https://journals.mesopotamian.press/index.php/BJME/article/view/1066. Acesso em: 7 mar. 2026.