arabic language spread in different parts ofpersiaafter arabic-islamic expansion in this territory. the iranians were interested in learning arabic, because it was the language of the qoran and islam and its injunctions which were based on monoism and unity of god; and equality and justice this is why one not find a book composed in scientific or historical or religious subjects or on etics dur...

The area of natural forest in Iran is approximately 12.4 million hectares, comprising 7.5%  of the total area of Iran. Forest management in the country was changed to the legislature after order of the Forest Nationalization Law in 1963. With  civilization development, pressure on forests was significantly increased. In the early  20th century a system of development planning began as a series ...

We studied the effect of nearest pattern interaction on a global pattern formation in a two-dimensional space, where patterns are to grow initially from a noise in the presence of a periodic supply of energy. Although our approach is general, we found that this study is relevant in particular to the pattern formation on a periodically vibrated granular layer, as it gives a unified perspective o...