In order to improve the resilience of structures subjected strong earthquakes, a buckling-plate self-centering friction damper (BPSCFD) with low post-yielding stiffness is proposed, which consists group post-buckling plates and variable mechanism. The intended not only reduce peak residual deformation structures, but also limit additional internal force structural elements. Through theoretical ...

introduction: transportation is an important iatrogenic endodontic error which might cause failure. this study evaluated the canal transportation caused by neoniti and protaper instruments, using cone-beam computed tomography (cbct) cross sections. methods and materials: this in vitro experimental study was performed on 40 mesiobuccal roots of maxillary first molars. the teeth were scanned with...

Abstract In this research, the feasibility of strengthening self-centering walls by high-performance concrete was investigated through an experimentally validated finite element model. The effects wall’s axial stress and tendons’ prestressing ratios on damage, effectiveness potential approaches were studied 40 independent scenarios, 360 different cases. Using estimated damage from numerical res...

Hybrid Coupled Wall (HCW) systems consist of reinforced concrete walls connected with steel coupling beams. HCWs benefit from the superior lateral stiffness walls, while mechanism reduces moment demand at base walls. The present study investigates seismic performance a new HCW system equipped friction-damped self-centering beams and examines efficiency in reducing residual deformations. intende...

The radial array of cytoplasmic microtubules (MTs) provides routes for intracellular transport and defines spatial organization of cytoplasm through interaction with molecular motors bound to membrane organelles (Kellogg et al., 1994; Hirokawa, 1998). The array is believed to be organized by the centrosome, which is capable of nucleating MTs. Our recent studies of pigment transport (Rodionov an...