From a historical retrospective, visible light was the electromagnetic phenomenon that was first studied even before being recognized as such [1] - [4]. C. Huygens (1629-1695) proposed the wave model to explain his behavior, ...

Total reflection x-ray fluorescence spectrometry (TXRF) is a relatively new technique, with great advantages for the field of biomedicine. It is an analysis technique at trace levels (1-100 parts per million (ppm)) and ...

In the present thesis, we have studied the emission of the long duration gamma ray bursts (LGRB) through numerical models that take into account the interaction of an ideal fluid with a thermal radiation field. Therefore, ...