We prove that certain volume preserving actions of Lie groups and their lattices do not preserve rigid geometric structures in the sense of Gromov. The actions considered are the ”exotic” examples obtained by Katok and Lewis and the first author, by blowing up closed orbits in the well known actions on homogeneous spaces. The actions on homogeneous spaces all preserve affine connections, wherea...

• Bare steel and composite semi-rigid moment-resisting connections were tested. The comprised CFS tubular sections connected using side plates. Various failure limit states captured through the tested connections. infill concrete effectively prevented beam local buckling. Side plate plasticity considered as a desirable energy dissipation mechanism. This paper presents results of full-scale phys...

Objectives: To evaluate the effects of abutment material and connection type on implant-abutment rigidity. Methods: The study evaluated eighteen implants with three different types connections: external-hexagon, tri-channel, conical connection. Half were connected to titanium abutments, other half zirconia forming six groups (n=3). submitted 1,200,000 load cycles a force amplitude 90 N. During ...

The aim of this study is to explore different practices for accelerating the integration of generating facilities to the electricity network using smart solutions. Case studies from Great Britain, Ireland and Northern Ireland and the Unites States were selected. The paper assesses and compares the different Principles of Access (POA) that have been imp...

considering recent developments in earthquake engineering, researchers has detected different effects of earthquakes far and near from the fault. investigations that have been done in this area show that near fault earthquakes have shorter time period comparing far fault earthquakes and in the velocity of near fault earthquakes, there are one or more impacting pulses with a big domain and perio...