In the present study, the effect of alumina on the pore structure and hydrothermal stability of nanostructured silica was investigated. SiO2 and SiO2-15wt%Al2O3 membranes were prepared by dip coating on mesoporous γ-Al2O3 coated macroporous α-alumina support. The particle sizes of sol were increased by adding of alumina to silica...

Sustainable development is a development that meets the needs of present generation while not compromising the ability of future generations to also meet their needs. There are 2 cases of sustainability. Case-1 is due to the discrepancy of environment and Case-2 is due to the change of environment. User, usage context and cultural aspects play important roles in the sustainability of system. Di...

so far, no clear analysis of political events in iran in the context of khwarazm in the third and fourth centuries ah/ tenth century has been achieved. the mistake, the political families of the ancient rule of the al-ma'mun, the continuity of all the ancient al afrygh are enumerated. so al- afrygh and al-iraq also have as a rule! while there is an aura of historical ambiguities, not a cit...

  Purpose: Since explosive blasts continue to cause casualties in both civil and military environments, there is a need for an understanding of the mechanisms of blast trauma at the human organ level, plus a more detailed predictive methodology. The primary goal of this research was to develop a finite element model capable of predicting primary blast injury to the lung so as to assist in the d...

the manifest of value of colors in nazik al-malaika s poemsali piranishal *khadije hashemi**from the early times, colors have played an important role in developing poeticimages, and colorful images are the realistic and sensory aspects among poets. poetshave used colorful words to explore and explain the relationship between poeticimages and sometimes they have used colorful words to express t...

An important allegory throughout the history of philosophy is Plato’s allegory of the cave. There are remarkable similarities between this allegory and an allegory from Islamic philosophy—that of western exile (al-ghurba al-gharbiyya) proposed by Suhrawardī. This paper seeks to consider fundamental components and issues within the two allegories, including the issue of the soul as the ...