Efficient direct valorization of methane to value-added chemicals and materials remains an unsolved challenge for modern chemistry science. In this work, we explored non-oxidative conversion hydrogen, hydrocarbons, valuable zeolite-templated carbon materials. First, using a set spectroscopy microscopy characterization tools, investigated how the reaction conditions influence process formation i...

In the present study asymptotic analysis of multi-parameter Williams series expansion stress-strain state in vicinity seven different configurations is performed. The aim to educate sensitivity cracked and notched number kept terms expansion. It shown that all with concentrated forces possess more truncated expansions and, therefore, require distributed loadings are less sensitive As a whole, i...

existence of cracks in industrial structures is one of the important causes of their failure, especially when they are subjected to important axial compressive forces that might lead to buckling. therefore, it must be considered in stress analysis and designing and loading of such structures. in this paper, the buckling and post-buckling behaviors of stainless-steel cracked plates under axial c...

Crack fault of rotor is one of the most prominent problems faced by magnetic bearing rotor system. In order to improve the safety performance of this kind of machinery, it is necessary to research the vibration characteristics of magnetic bearing cracked rotor system. In this paper, the stiffness model of the crack shaft element was established by the strain energy release rate (SERR) theory. T...

In this paper, the transverse vibration of cracked nano-beam has been studied based on modified couple stress theory. Crack is modeled by a rotational spring that creates a discontinuity. Frequency equations of cracked nano-beam with some typical boundary conditions are derived and the frequency parameter for different crack positions, crack parameter and length scale parameters value are calcu...

In this study, a novel and very simple finite element procedure is presented for free vibration and buckling analysis of slim beam-like structures damaged by edge cracks. A cracked region of a beam is modeled using a very short element with reduced second moment of area (I). For computing reduced I in a cracked region, the elementary theory of bending of beams and local flexibility approach are...