Supermassive Black Hole Binaries: The Search Continues

Gravitationally bound supermassive black hole binaries (SBHBs) are thought to be a natural product of galactic mergers and growth of the large scale structure in the universe. They however remain observationally elusive, thus raising a question about characteristic observational signatures associated with these systems. In this conference proceeding I discuss current theoretical understanding and latest advances and prospects in observational searches for SBHBs.Comment: 17 pages, 4 figures. To appear in the Proceedings of 2014 Sant Cugat Forum on Astrophysics. Astrophysics and Space Science Proceedings, ed. C.Sopuerta (Berlin: Springer-Verlag

'Conciousness' : un nuevo concepto en psicología social según Charles Reich

The chain reaction failure of a major portion of a structure that is initiated by the failure of a relatively small portion is referred to as the progressive collapse of a structure. The main approach used for the evaluation of a structure’s vulnerability to progressive collapse is the instantaneous removal of a load bearing element of the structure, followed by studying its effect on other structural elements. An analytical study using a finite element model (FEM) is used in this investigation with the aim of comparing the main two standards that address progressive collapse. A three-dimensional nonlinear model of a concrete generic frame structure is used in the study. The structure is designed according to different seismic zones in order to evaluate the effect of the seismic region on its vulnerability to progressive collapse