Boznein vein-type has penetrated in the porphyric rhyolite-hosted and along a single northeast-trending reverse fault. Microscopic studies and electron microprobe data, show the presence of a variety of Mn minerals such as spessartine, rhodochrosite, bixbyite, hausmannite, braunite, pyrolusite, psilomelane, cryptomelane, manganite and mangano-calcite in the Mn deposit as well as braunite, pyrol...

Aims & Backgrounds: The occurrence of earthquakes in urban areas, have destructive effects, and the inhabitants are increasingly suffering from their harmful impacts. It appears that preparing proactive planning before the disaster occurrence, may reduce damages, casualties and financial losses. This paper aims to identify the vulnerability of the physical fabric of Hashtgerd new town against a...

1- Introduction: Geomorphic investigation is a powerful tool for studies of active tectonics in active regions. Active faults and folds commonly have topography that can assist in identifying different geomorphic or structural segments along a structure, and estimating the potentially most active segments. In tectonically active regions, drainage networks and topographic features can be used as...

a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...

Introduction: Seismicity is closely related to active Quaternary faults.This attracts many researchers to investigate the quantitative relationships between them. As a new parameter, FMP is defined to quantify earthquake risk.Iran is one of the most active areas of the world in terms of tectonic activities in the Alps-Himalayan belt. One of the characteristics of this belt includes the presence...

among the low–dimensional allotropes of carbon, nanotubes and graphene have attracted very much attention from nano–science and nanotechnology specialists. they have been proposed as building blocks in nanometer device engineering. however, these structures are not defect–free. in this thesis, we focused on defective carbon nanotubes and graphene, and studied the effect of couple of very common...

abstract in aggregate, active forms of reactive silica with mineral names are sometimes associated with sand and gravel in concrete mixture. alkali hydroxides originated from alkalis in the cement or other resources form an alkaline silica gel with this reactive silica which becomes swallowed and expanded during time causing damage to concrete. there have been growing researches on alkaline r...