Spherical Shell
Mostrando 1-12 de 47 artigos, teses e dissertações.
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1. Synthesis, Characterization and Photocatalytic Activity of Au/SiO2@TiO2 Core-Shell Microspheres
By using HAuCl4 as the gold precursor, spherical Au@SiO2/TiO2 core-shell nanostructures were prepared with the sol-gel method and ethanol reflux. The preparation process was convenient and fast. The obtained samples were characterized by UV-Vis, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TE
J. Braz. Chem. Soc.. Publicado em: 2020-03
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2. On the stability of internally pressurized thick-walled spherical and cylindrical shells made of functionally graded incompressible hyperelastic material
Abstract In this paper, stability analysis of thick-walled spherical and cylindrical shells made of functionally graded incompressible hyperelastic material subjected to internal pressure is presented. Instability point happens in the inflation of above mentioned shells and in this paper effect of material inhomogeneity and shell thickness has been investig
Lat. Am. j. solids struct.. Publicado em: 04/06/2018
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3. Nano-Sized Silver Colloids Produced and Stabilized by Amino-Functionalized Polymers: Polymer Structure-Nanoparticle Features and Polymer Structure-Growth Kinetics Relationships
The synthesis of highly stable silver colloids has been successfully achieved by using reducing/stabilizer amino-functionalized polymers without the aid of any other external agent. The polymer coated inorganic nanoparticles have been detailed characterized via scattering, imaging and UV-Vis spectroscopy. The combination of transmission electron microscopy (
J. Braz. Chem. Soc.. Publicado em: 2017-09
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4. Synthesis of Submicrometer Calcium Carbonate Particles from Inorganic Salts Using Linear Polymers as Crystallization Modifiers
In this study, we report the synthesis of submicrometer calcium carbonate particles using the simplest approach of mixing solutions of calcium chloride and ammonium carbonate inorganic precursors in the presence of crystallization modifiers. Instead of the typical crystallization of CaCO3 into large calcite crystals with rhombohedral morphology, very small u
J. Braz. Chem. Soc.. Publicado em: 2017-04
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5. A Study on Equivalent Spherical Structure of Buckyball-C 60 Based on Continuum Shell Model
Abstract The main goal of this research is to extract a suitable continuum modeling of buckyball-C60. For this purpose, firstly the lattice structure of buckyball-C60 is modelled and subsequently a spherical structure equivalent to fullerene structure is considered. The fullerene structure modeled with shell elements is under internal pressure and in the con
Lat. Am. j. solids struct.. Publicado em: 2016-05
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6. Stress Analysis of Thick Spherical Pressure Vessel Composed of Transversely Isotropic Functionally Graded Incompressible Hyperelastic Materials
Abstract In this paper closed form analytical solution for stress components of thick spherical shell made of transversely isotropic functionally graded hyperelastic material subjected to internal and external pressure is presented. Reinforced neo-Hookean strain energy function with variable material parameters is used to model pressure vessel material. The
Lat. Am. j. solids struct.. Publicado em: 2016-03
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7. Fractional heat conduction with finite wave speed in a thermo-visco-elastic spherical shell
This problem deals with the thermo-elastic interaction due to step input of temperature on the stress free boundaries of a homogeneous visco-elastic orthotropic spherical shell in the context of a new consideration of heat conduction with fractional order generalized thermoelasticity. Using the Laplace transformation, the fundamental equations have been expr
Lat. Am. j. solids struct.. Publicado em: 2014-12
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8. Dynamic response of functionally graded skew shell panel
The dynamic response of functionally graded skew shell is investigated using a C0 finite element formulation. Reddy's higher order theory has been employed to perform the analysis and the volume fractions of the ceramic and metallic components are assumed to follow simple linear distribution law. The present study attempts to focus mainly on the influence of
Lat. Am. j. solids struct.. Publicado em: 2013-11
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9. A shell finite element formulation to analyze highly deformable rubber-like materials
Abstract: In this paper, a shell finite element formulation to analyze highly deformable shell structures composed of homogeneous rubber-like materials is presented. The element is a triangular shell of any-order with seven nodal parameters. The shell kinematics is based on geometrically exact Lagrangian description and on the Reissner-Mindlin hypothesis. Th
Lat. Am. j. solids struct.. Publicado em: 2013-11
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10. Analysis of laminated composite skew shells using higher order shear deformation theory
Static analysis of skew composite shells is presented by developing a C0 finite element (FE) model based on higher order shear deformation theory (HSDT). In this theory the transverse shear stresses are taken as zero at the shell top and bottom. A realistic parabolic variation of transverse shear strains through the shell thickness is assumed and the use of
Lat. Am. j. solids struct.. Publicado em: 2013-09
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11. Ultrastructure of Myxobolus brycon n. sp. (Phylum Myxozoa), parasite of the Piraputanga Fish Brycon hilarii (Teleostei) from Pantanal (Brazil).
Light and electron microscopy studies of a myxosporean, parasitizing the gill filaments of the freshwater fish Brycon hilarii (Valenciennes, 1850) (Characidae) collected in the Paraguay River (181490S, 571390W) (Pantanal), Brazil, is described. This parasite produces spherical to ellipsoidal polysporic histozoic plasmodia (Pmd) (up to ~ 180 mm in diameter) d
Journal of Eukaryotic Microbiology. Publicado em: 2011
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12. Acoplamento spin-fonon em sistemas magneticamente frustrados / Spin-phonon coupling in magnetically frustrated systems
In this thesis we present an investigation of two magnetically frustrated systems, namely the RMn2O5 series (R = Eu, Bi, Dy) and the intermetallic compound GdAl3, in addition to the double perovskite compound Sr2CoUO 6. These systems were studied mainly using the Raman spectroscopy technique and complemented with magnetic susceptibility measurements. For the
Publicado em: 2007