On the periodic solutions of a generalized smooth or non-smooth perturbed planar double pendulum

We provide sufficient conditions for the existence of periodic solutions with small amplitude of the non--linear planar double pendulum perturbed by smooth or non--smooth functions.Comment: arXiv admin note: substantial text overlap with arXiv:1109.637

Phenotypic Analysis of S. aureus strains from University Student Health Centers and Environmental Controls

Methicillin-resistant Staphylococcus aureus (MRSA) is a group of pathogenic bacterial strains resistant to a class of antibiotics that is a major cause for concern in health care systems. There is a lack of study in whether health care centers are reservoirs for these bacteria, especially within developed countries. Five environmental swab samples were collected from five different university health care centers across the region, and 16 swab samples from a general university environment. Any isolated bacterial strains collected underwent five biochemical tests (mannitol fermentation, DNase activity, oxidase activity, catalase activity, and coagulase activity) to preliminarily identify S. aureus bacteria. 24% of the clinical samples and 25% of environmental samples contained S. aureus, signifying an equal distribution of the species among the two location groups. In addition, extensive literature review showed how isolated S. aureus strains can easily be characterized as MRSA, through antibiotic disc-diffusion testing and genetic sequencing of the potential SCCmec region. This genetic sequencing can also identify SCCmec type and class, identifiers useful in comparison to current MRSA studies

Generic bifurcation of reversible vector fields on a 2-dimensional manifold

In this paper we deal with reversible vector fields on a 2-dimensional manifold having a codimension one submanifold as its symmetry axis. We classify generically the one parameter families of such vector fields. As a matter of fact, aspects of structural stability and codimension one bifurcation are analysed

Foliations, solvability and global injectivity

Let F: R^n -> R^n be a C^\infty map such that DF(x) is invertible for all x in R^n. We know that F is a local diffeomorphism but, in general, it is not globally injective. We discuss the relations between some additional hypothesis that guarantee the global injectivity of F. Further, based on one of these hypotheses, we establish a necessary condition for the existence of F: R^n -> R^n such that det DF = h, where h: R^n -> [0,\infty) is a given C^\infty function

The elastoplastic analysis of planar frames for large displacements by mathematical programming

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Uma criação falsa: nódoas no mundo lustroso de imitação de vida

In this article I try to show that the film Imitation of Life is more than a typical Hollywood family melodrama of the Fifties, a current reading of the film. For that purpose, I propose a reading that reveals, through the analysis of the films miseen- scène and characterization, the subversion of characteristics of the genre in which the film can be included and an acerbic criticism of the excluding and perverse American way of life.Neste artigo procuro mostrar que o filme Imitação da Vida é mais do que um típico melodrama familiar hollywoodiano dos anos cinqüenta, leitura mais corrente do filme. Com esse propósito, apresento uma proposta de leitura que revela, através da análise de elementos como mise-en-scène e caracterização, a subversão de valores do gênero em que o filme se inclui e uma crítica acerba ao excludente e perverso American way of life