In this research Calcium fluoride nanoparticles and its different amount of cerium ion dopant (5%and 10%) were prepared. The mentioned nanoparticle were studied by fourier transform infrared spectroscopy (FTIR) , X-ray diffraction (XRD), absorption and photoluminescence spectra (PL) and Scanning electron microscopy (SEM). The XRD patterns indicate a typical cubic fluorite structure and no other...

In present study, the effects of optimization on seismic energy spectra including input energy, damping energy and yielding hysteretic energy are parametrically discussed. To this end, 12 generic steel moment-resisting frames having fundamental periods ranging from 0.3 to 3s are optimized by using uniform damage and deformation approaches subjected to a series of 40 non-pule strong ground motio...

In this research Calcium fluoride nanoparticles and its different amount of cerium ion dopant (5%and 10%) were prepared. The mentioned nanoparticle were studied by fourier transform infrared spectroscopy (FTIR) , X-ray diffraction (XRD), absorption and photoluminescence spectra (PL) and Scanning electron microscopy (SEM). The XRD patterns indicate a typical cubic fluorite structure and no other...

Design spectra are commonly defined for a constant value of hazard associated to an “ultimate” limit state (LS) reference, typically 10% in 50 years. Given specific structure, this approach results different limit-state exceedance risk levels even sites characterized by the same design peak ground acceleration (PGA), mainly because differences curve shape/slope. Instead, Risk Targeted maps (fir...

Input motion set selection for nonlinear dynamic structural analysis is commonly based on spectral compatibility, obtained through the uniform scaling of natural signals. Due to aleatory nature expected time history, alone compatibility requirement appears very weak guarantee scaled ground motions that suit local seismic hazard. Magnitude-Distance interval pairs control and factor thresholds do...

Bifurcations of classical orbits introduce divergences into semiclassical spectra which have to be smoothed with the help of uniform approximations. We develop a technique to extract individual energy levels from semiclassical spectra involving uniform approximations. As a prototype example, the method is shown to yield excellent results for photoabsorption spectra for the hydrogen atom in an e...

This article presents updated seismic hazard curves, spectra, and maps of ground motion intensity measures for the northern region Dominican Republic (DR) obtained using a probabilistic analysis (PSHA). The performed uses as input data an earthquake recurrence model based on fault slip rates derived from GPS measurements published in aftermath 2010 Haiti earthquake. seismicity rate are used to ...