Abstract Geometrical symmetry plays a significant role in implementing robust, symmetry-protected, bound states the continuum (BICs). However, this benefit is only theoretical many cases since fabricated samples’ unavoidable imperfections may easily break stringent geometrical requirements. Here we propose an approach by introducing concept of geometrical-symmetry-free but symmetry-protected BI...

We develop a based on sparse random graph to account for the interplay between geometric frustration and disorder in cluster magnetism. Our theory allows introduction of network connectivity as controllable parameter. Two types inner geometry are considered: triangular tetrahedral. The was developed general, nonuniform intracluster interactions, but present paper results presented correspond un...

The complex global analysis of the steel tied-arch bridges may require specific data in some cases, e.g., residual stress or real geometrical imperfections. presented research is focused on investigation actual in-plane shape bridges. To obtain shapes arches existing bridges, 3D terrestrial laser scanning was applied. Data were then investigated as a group order to find relationship within brid...