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- 저자 : K. Torabi (검색결과 2 건)
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Morteza Torabi,S.K. Sadrnezhaad 한국물리학회 2010 Current Applied Physics Vol.10 No.1
Fe/multi-walled carbon nanotubes (Fe/MWCNTs) nanocomposite was produced using electrochemical techniques onto platinum substrate. Linear sweep voltammetry (LSV) analysis revealed that deposition rate of the nanocomposite is higher than of the pure Fe deposition. X-ray diffraction (XRD) was used to confirm nanocomposite formation. Scanning electron microscopy (SEM) images showed dendrite growth of the pure Fe onto a flake-like (thickness of about 90 nm) structure with a filamentous carbon network. The morphology of the nanocomposite consisted of only uniform nanoflakes with thickness of about 50 nm. Adsorption of the MWCNTs on the flakes led to decrease the nucleation energy and avoided formation of the prisms that are essential for dendrite growth. The nanocomposite showed superior catalytic activities for hydrogen evolution reaction (HER), twice of the pure Fe when the overpotential of -1.3 V was applied. The overpotential.time results indicated that HER activity of thin films decreased during the long-term working. But, nanocomposite was more stable than the pure Fe.
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Mehdi Mohammadimehr,Hasan Afshari,M. Salemi,K. Torabi,Mojtaba Mehrabi 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.5
In the present study, buckling and free vibration analyses of annular thin sector plate made of functionally graded materials (FGMs) resting on visco-elastic Pasternak foundation, subjected to external radial, circumferential and shear in-plane loads is investigated. Material properties are assumed to vary along the thickness according to an power law with Poisson’s ratio held constant. First, based on the classical plate theory (CPT), the governing equation of motion is derived using Hamilton’s principle and then is solved using the generalized differential quadrature method (GDQM). Numerical results are compared to those available in the literature to validate the convergence and accuracy of the present approach. Finally, the effects of power-law exponent, ratio of radii, thickness of the plate, sector angle, and coefficients of foundation on the fundamental and higher natural frequencies of transverse vibration and critical buckling loads are considered for various boundary conditions. Also, vibration and buckling mode shapes of functionally graded (FG) sector plate have been shown in this research. One of the important obtained results from this work show that ratio of the frequency of FG annular sector plate to the corresponding values of homogeneous plate are independent from boundary conditions and frequency number.
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