Buckling and post-buckling of a long, thin, inextensible tube made of graphene material acted upon by a uniform normal pressure are considered. A system of differential equations governing the equilibrium states of such a tube is derived. Perturbation solutions are provided for the cases of pressure values close to the critical buckling pressures. A Matlab numerical solver based on Newton's and shooting methods are developed. The buckling and post-buckling shapes of the deformed tube subject to various levels of pressure are presented.
Abstract. Ordered 2D hexagonal and parallel arranged pore channel mesoporous silica materials with homogeneous size and spherical shape have been synthesized by using amino acid-based surfactant templating, their ordered mesostructures were characterized by infrared spectroscopy, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen sorption analysis.
In this paper, the apparent chain like core shell structure Fe 3 O 4 -SiO 2 -chitosan nanoparticles was synthesized by two step method with cross linking action of glutaraldehyde based on layer by layer tech nology, the composite particles were characterized by IR, XRD, TEM, SEM, EDS and VSM analytical meth ods, and the synthesis conditions of the product were studied. The results indicated that the diameter of the composite particles is about 106.5 nm, the parietal layer of chitosan is 20 nm, and after crosslinking action of glutaraldehyde, chitosan uniformaly coated the outer surface of Fe 3 O 4 -SiO 2 .
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