the quality of pressure distribution over the atmosphere of the sea level and geopotential altitude at different atmosphere layers affect on many climate and meteorology phenomena of the earth surface. one of the important meteorology phenomenon is the occurrence of frost phenomenon especially late spring frost. in this surrey, occurring late spring frost days and minimum temperature during the...

In this research, the high-energy planetary mill was employed to produce nanocrystalline Ti-50Al(γ)(at%) powders. Initial powders were mechanically alloyed in 99.9999% and 90% purities of Argon and also Air atmosphere with alloying times up to 50h. The effect of impurity of Argon atmosphere on the microstructure and the rate of phase transformation of Ti-50Al were investigated during mechanical...

global warming is one of the major concerns in environmental issues. its effects are being exposed faster than anticipated recently. it causes adverse ecological and socioeconomical effects. the 4th assessment report issued by the u. n.’s intergovernmental panel on climate change (ipcc) states that it is appropriate to define global warming was caused by greenhouse gases due to human activities...

conclusions the analysis of the findings of the present study through considering the defined categories demonstrated that, to modify and correct the turbulent atmosphere-based management, several important measures are required and need to be continually monitored. results the result of data analysis was the theme “turbulent atmosphere-based management,” which consists of five categories as fo...

the main sources of human exposure to trace metals for non-occupationally exposed individualsare inhalation and ingestion. because the absorption rates of the metals by inhalation are significantly higher (up to 50-60%) than those by ingestion (between 3% and 10%), determination of trace metals in ambient air samples is of special interest. the main purpose of this study was to determine fe, zn...

attar is one of the first poets who had seriously narrated a story in their lyric poems. bringing up a narrative in such kind of lyrics is merely a means of a literary form, but can be considered as an epistemological structure. in these narratives and in the progress of their meaning making, attar has effectively used the ruling broking atmosphere of his poems. in these narratives, the atmosph...