Federal University of São Carlos

About: Federal University of São Carlos is a education organization based out in São Carlos, Brazil. It is known for research contribution in the topics: Population & Microstructure. The organization has 16471 authors who have published 34057 publications receiving 456654 citations. The organization is also known as: UFSCar & Federal University of São Carlos.

Structure of rings in vitreous SiO 2

Abstract: The structure of n-fold rings in vitreous ${\mathrm{SiO}}_{2}$ is investigated using molecular-dynamics configurations. A recently developed interaction potential for ${\mathrm{SiO}}_{2}$ consisting of long-range Coulomb interactions, the effect of electronic polarizability, and three-body covalent forces is used in the molecular-dynamics study of the vitreous state. Results for the statistics of rings and distribution of interatomic distances and bond angles in the rings are presented for the vitreous state. The statistics of rings for the molten state is also discussed.

Large deformation and amorphization of Ni nanowires under uniaxial strain: A molecular dynamics study

Abstract: Molecular-dynamics simulations were employed to study deformations on nickel nanowires subjected to uniaxial strain at 300 K using a recently reported embedded-atom (many body) model potential. This embedded-atom model can reproduce exactly the experimental second-order and third-order elastic moduli as well as the phase stability, equation of state and phonon frequency spectra are also in good agreement with experiments. Strong influence was observed in the Young modulus and force constant due to surface effects when considering nanowires with different cross sections. Applying strain rates, from 0.05 to $15%{\mathrm{ps}}^{\ensuremath{-}1},$ we found elastic behavior up to 11.5% strain with corresponding stress of 9.4 GPa. At low strain rates $(l0.05%{\mathrm{ps}}^{\ensuremath{-}1})$ the system passes through plastic deformations although keeping the crystalline structure. This ductile process is showed by several snapshots. At this low strain rate regime we observed that the nanowires shows superplasticity. For high strain rates $(g~7%{\mathrm{ps}}^{\ensuremath{-}1})$ the system changes continuously from crystalline to amorphous phase. Although this amorphization occurs with no use of liquid quenching or introduction of chemical or physical disorder, so being a different and interesting process, the amorphous resulted is unstable. We studied this instability monitoring the recrystallization process.

A Teoria Queer e a Sociologia: o desafio de uma analítica da normalização

Abstract: Originated from the American Cultural Studies, Queer Theory has gained a reputation as a critical counterpoint to the sociological studies on sexual minorities and the political identity of the social movements. Based on a creative implementation of post-structuralist philosophy for the understanding of how sexuality shapes the contemporary social order, for more than a decade its affinities and tensions, as related to the social sciences, and particularly to sociology, are in discussion. This article joins the debate, analyzes the similarities and distinctions between those two, and finally presents an overview of the current dialogue, pointing to a possible convergence in the queer project to enable an analysis of normalization.