درخت حوزه‌های تخصصی

This study aims to present qualitative and quantitative explanations of eight kinds of charcoal discovered from an archeological site at Tepe Kelar in northern Iran. The excavations were carried out in 2006 and 2008. In addition to cultural remains, different kinds of charcoals were discovered hence, their descriptive analysis provided valuable information about culture and ecology of the region during the prehistoric period. To analyze the samples, thin transverses and their radial sections were prepared and analyzed using Electron Microscope, and specifications of the vessels, tissue, wood rays, and other elements of them were measured and recorded. The identification of the woods was initially conducted through the microscopic properties of hardwood and the findings were then compared with the Atlas of woods in North of Iran. The taxonomic identification using the wood anatomy showed that four samples belong to the genus Fagus Orientalis Lipsky 1898, one of which belongs to genus Corylus Avellana 1753 and the remaining three samples were not recognizable due to their small size. In the third trench, ruins of a metal melting kiln were discovered together with large pieces of charcoals. It is likely that wood species identified in this study were used to melt metals in the Bronze and Iron Ages.

This study was an attempt to examine the intercultural experience of Iranian university students studying abroad and explore variables influencing their success or failure in intercultural interactions. A qualitative method involving semi-structured interviews and retrospective narratives were employed in order to achieve an in-depth understanding of intercultural competence of the international university students which came to light from their reflections and interactions. The findings provided insights into three major components of intercultural communicative competence, i.e. attitude, knowledge and skill featured vigorously on students’ reflections. Most significantly, investigation of the data-set revealed several facilitating and debilitating factors contributing to intercultural encounters. 

Hail is an atmospheric rainfall with a complex mechanism. The Greeks were among the pioneers of knowledge in ancient times and they termed “hail” as “frozen rain” (Anaximander) and “instant freezing of water and moisture” (Aristotle, n.d.). These two meanings are inconsistent with current scientific facts. The Noble Qurʼan is the most authentic text to encourage Muslim believers to think about creation and strengthen their faith in the eternal power of the Creator. For instance, the mechanism of hail falling has been expressed in the verse (Q.24:43) with specific and gradual indications. In this research, first, by library method, different explanations of this verse were obtained from valid interpretive sources and then, the scientific findings of meteorologists and climatologists on hail were extracted from reference scientific texts on atmospheric sciences. In the third stage and based on comparative method, the scientific rules were placed next to interpretations to test the novelty and degree of the allusions of this verse. We found that the stages of hail falling included:“invisible water vapor rises from the sea,” “water vapor ascends into the atmosphere,” “reaching the condensation stage,” “cloud formation,” “convergence of ascending currents,” “formation of cumulonimbus cloud,” “growth of hailstones during successive ascents and descents by adsorption and freezing of ice needles,” and finally “their fall down over ground” respectively. Meanwhile, the steps in the Noble Qurʼan are mentioned in verse (Q.24:43) in the following order:“clouds movement slowly,” “clouds convergence,” “clouds accumulation,” “the formation of mountain-like clouds,” and “hail falling from the clouds.” The results also showed that likening cumulonimbus cloud in the verse (Q.24:43) to “mountain” have four respects that were beyond the comprehension of the people at the time of the revelation of the Qurʼan. Nowadays, these features are known to stationary and satellite meteorological instruments. These four characteristics are “cloud layer temperature,” “their constituent phase,” “troughs and ridges inside the cloud” and “cloud height up to the tropopause.” Based on these four characteristics, the Noble Qurʼan considered the cloud of cumulonimbus as similar as “mountains.” Meteorologists divide any cumulonimbus cloud into three floors, including cold at the bottom, super-cold at the top and intermediate in the middle. We find these three floors in the same way in the high mountains. These floors are the current rivers (liquid phase), snow and ice reserves (solid phase) and in the middle region a combination of two liquid and solid phases, namely water and ice. Images from the cumulonimbus from above the atmosphere show dark and deep valleys and light and raised ridges. The fourth feature is to be said, none of the surface phenomena are as high as the mountains. Finally, meteorological findings show that it is the only cumulonimbus that rises from the ground to a height of 12,000 meters and more.