In the 1700s, scientists, sailors, engineers and explorers were trying to work out how to navigate east to west at sea. The stakes were high; many lives were lost because sailors could not reliably measure longitude. Eventually, the invention of accurate timepieces allowed sailors to use the time in their current location, and the time at a fixed reference, to calculate longitude. But how do lo...

OSSE was used to measure the longitude and latitude distribution of positron annihilation in the inner galactic ridge using diierential measurements relative to intensities at latitudes of 10. An improved understanding of the 50 keV to 10 MeV continua has recently permitted accurate determinations of the positronium continuum ux intensities; this provides an 5 times greater signal than was avai...

The studied region in this research (Alborz province) is structurally located in Alborz poly_orogenic system of northern Iran. The purpose of this research is combining the remote sensing and geology sciences to show fault lineaments by analyzing satellite data in a vast region and also comparison between lineaments layer and recognized faults in geology maps. Firstly, two scenes of Landsat ETM...