Numerous studies have been performed on the generation of several silicon-based engineering materials that often used chemical high risks for health and safety environment. Generally, in synthesis Nano-silica, tetramethoxysilane, tetraethoxysilane, tetraethyl orthosilicate (TEOS) are as precursor materials; however, these toxic expensive production Nano-silica. This paper presents an environmen...

Natural hazards are the underlying cause of between 1 and 7 percent federally reported hazmat releases in US every year. During period from 1990 through 2019 fraction caused by natural has increased, large part due to increased hurricanes as well floods, storms wind. Many these events minor, but some have resulted expensive deaths, injuries, evacuations. Inter annual variability is correlated w...

there are different approaches in philosophical justification of the influences of metaphysical or spiritual causes on the material world. according to the approaches of the the most muslim thinkers, the deposited factors are influencing the on material world, but such influencing is along with the natural and material causes. accordingly, is it possible to propose a methodological materialism ...

The classical shell theory, first-order shear deformation theory, and third-order shear deformation theory are employed to study the natural frequencies of functionally graded cylindrical shells. The governing equations of motion describing the vibration behavior of functionally graded cylindrical shells are derived by Hamilton’s principle. Resulting equations are solved using the Navier-type s...

the synthesis of nano- structured cobalt through a controlled chemical process followed by heat treating at various temperatures is studied. the product is characterized by icp, xrd, fesem , and tem, indicating that the as- synthesized particles have an amorphous structure with 1.76 for co/b ratio, an average size of 50 nm. the transformation of intermediate phases into single phase nano- cryst...

The majority of contemporary insulation materials commonly used in the building industry is made from non-renewable raw materials; furthermore, their production often brings high energy costs. A long-term trend as far as sustainable development is concerned has been the reduction of energy and material demands of building material production. One of the solutions is the possibility of using eas...