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- 저자 : Samane Rahmani (검색결과 2 건)
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Omid Rahmani,S. Samane Asemani 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.2
The theories having been developed thus far account for higher-order variation of transverse shear strain through the depth of the beam and satisfy the stress-free boundary conditions on the top and bottom surfaces of the beam. A shear correction factor, therefore, is not required. In this paper, the effect of surface on the axial buckling and free vibration of nanobeams is studied using various refined higher-order shear deformation beam theories. Furthermore, these theories have strong similarities with Euler–Bernoulli beam theory in aspects such as equations of motion, boundary conditions, and expressions of the resultant stress. The equations of motion and boundary conditions were derived from Hamilton’s principle. The resultant system of ordinary differential equations was solved analytically. The effects of the nanobeam length-to-thickness ratio, thickness, and modes on the buckling and free vibration of the nanobeams were also investigated. Finally, it was found that the buckling and free vibration behavior of a nanobeam is size-dependent and that surface effects and surface energy produce significant effects by increasing the ratio of surface area to bulk at nano-scale. The results indicated that surface effects influence the buckling and free vibration performance of nanobeams and that increasing the length-to-thickness increases the buckling and free vibration in various higher-order shear deformation beam theories. This study can assist in measuring the mechanical properties of nanobeams accurately and designing nanobeam-based devices and systems.
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Maryam Homayoonfal,Mohammad Reza Mehrnia,Samane Rahmani,Yasaman Mohades Mojtahedi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this study, polysulfone/alumina nanocomposite membranes were synthesized with the principal aimof reducing biofouling in membrane bioreactors. The filtration experiments indicate that aluminananoparticles can increase water flux by enhancing membrane hydrophilicity while maintaining theseparation efficiency through decreasing porosity. Altogether, as confirmed by AFM images, thedevelopment of roughness results in biofilm formation reduction on the membrane surface layer. Onthe whole, presence of alumina nanoparticles up to the polymer concentration of 0.03 wt.% will result inan augment in separation yield up to 7%, four times higher water flux, and 83% reduction in membranefouling.
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