Effects of heat-transferring property of silver nanoparticles were evaluated on two solid woods of poplar and fir and in combination with Borax. Nanosilver and Borax were applied in pressure vessel using Rueping method. The size range of silver nanoparticles was 20-80 nm. Specimens of 150×130×9 mm were prepared and five fire-retarding properties were measured using a newly designed slide fire t...

based on writing of tabari as well as other historical researches, mihr narseh, prime minister of bahram v (421-439 ad) founded a number of buildings in the province of ardashir khorrah. among public utility buildings, he built four fire temples in four villages in baryn plains of the same province. the current paper tries to find the exact locations of those temples based on references availab...

the fire as one of the ecological factor has positive or negative effects on ecosystems components. therefore, this study was evaluated the effect of fire on some soil physico-chemical properties in winter rangelands of behshahr. so that two burned sites were selected in rangelands and changed rangelands to wheat and barley with two control areas (unburned) in each of them. the soil sampling wa...

various opinions have been put forward about achaemenian beliefs and thoughts, especially about the religious beliefs of the achaemenian kings such as cyrus the great. scholars rely on herodotus’s statements that “they didn’t look at building temples and altars as a religious tradition, they refer believing in these things as ignorance and foolishness in the converse opinion to greeks. they did...

fire-retarding properties of wollastonite nanofibers in poplar wood (populus nigra) were studied here. some physical properties such as water absorption, volumetric swelling and anti-swelling efficiency (ase) were also measured. specimens were prepared according to the iso 11925 specifications for the fire-retarding properties and according to the astm d4446 -2002 specifications for the physica...

material hazards are the most important risk in scientific laboratories. in risk assessment processing, the potential impact of assessor personal judgment is the most important issue. this study tried to develop a risk assessment pattern based on failure mode and effect analysis (fmea) and analytical hierarchy process (ahp) logics and empirical data in scientific laboratories. the most importan...

fire consider as a factor and basic management in rangeland in order to reform of composition and biological diversity that use in rangeland ecosystems. this project was established to deal with the effect of fire in the research center for rangeland. zagheh locale where is in 35 km of north eastern of khoramabad with 1960 meters above sea level. the average comparison and analysis show that he...