Inspection and diagnosis tests for structural safety evaluation: A case study

Diagnosis and assessment of existing structures is a developing area due to the appearance of a high number of building defects, structural and non-structural deterioration and precocious loss of quality, and, consequently, lower expected durability. With the aim of verifying the viability of rehabilitation or the need to demolish an existing fifteen year old parking building, several inspections and diagnostic non-destructive and destructive testing, visual inspection, were carried out to evaluate the structural safety conditions

Spin-polarized transport in ferromagnetic multilayered semiconductor nanostructures

The occurrence of inhomogeneous spin-density distribution in multilayered ferromagnetic diluted magnetic semiconductor nanostructures leads to strong dependence of the spin-polarized transport properties on these systems. The spin-dependent mobility, conductivity and resistivity in (Ga,Mn)As/GaAs,(Ga,Mn)N/GaN, and (Si,Mn)/Si multilayers are calculated as a function of temperature, scaled by the average magnetization of the diluted magnetic semiconductor layers. An increase of the resistivity near the transition temperature is obtained. We observed that the spin-polarized transport properties changes strongly among the three materials.Comment: 3 pages, 4 figure

Características físico-químicas de raízes de mandioca brava (Manihot esculenta Crantz).

A caracterização e avaliação do Banco Ativo de Germoplasma (BAG) de mandioca é fundamental para a sua utilização mais eficiente nos trabalhos de melhoramento genético, portanto o objetivo deste trabalho foi caracterizar 15 genótipos de mandioca brava pertencentes ao BAG da Embrapa Amazônia Oriental. A caracterização físico-química é fator preponderante para a seleção de genótipos, pois permite definir quais genótipos apresentam características desejáveis. Após a colheita das raízes, estas passaram por lavagem, descasque e armazenamento até o momento de utilização nas analises físico-químicas percentual de proteínas variou de 0,1-0,7%; lipídios 0,3-2,1%; umidade 58,0- 65,2%; cinzas de 0,1-1,0%; fibras 0,9-1,9%, carboidratos 13,9-39,4%; acidez 1,1-2,7%; ph 6,3-6,8 e SST de 0,8-1,2. As diferenças encontradas nos resultados podem contribuir para seleção de genótipos promissores a serem utilizados em programas de melhoramento genético

New Constraints on the Variable Equation of State Parameter from X-Ray Gas Mass Fractions and SNe Ia

Recent measurements are suggesting that we live in a flat Universe and that its present accelerating stage is driven by a dark energy component whose equation of state may evolve in time. Assuming two different parameterizations for the function $\omega(z)$, we constrain their free parameters from a joint analysis involving measurements from X-Ray luminosity of galaxy clusters and SNe type Ia data.Comment: paper, 6 pages, 1 figure Accepted by Int. Journal of Modern Physics D (IJPMD

Hybrid Control for Robust and Global Tracking on Smooth Manifolds

In this paper, we present a hybrid control strategy that allows for global asymptotic tracking of reference trajectories evolving on smooth manifolds, with nominal robustness. Two different versions of the hybrid controller are presented: One which allows for discontinuities of the plant input and a second one that removes the discontinuities via dynamic extension. By taking an exosystem approach, we provide a general construction of a hybrid controller that guarantees global asymptotic stability of the zero tracking error set. The proposed construction relies on the existence of proper indicators and a transport map-like function for the given manifold. We provide a construction of these functions for the case where each chart in a smooth atlas for the manifold maps its domain onto the Euclidean space. We also provide conditions for exponential convergence to the zero tracking error set. To illustrate these properties, the proposed controller is exercised on three different compact manifolds-the two-dimensional sphere, the unit-quaternion group, and the special orthogonal group of order three- A nd further applied to the problems of obstacle avoidance in the plane and global synchronization on the circle

Crescimento e produção de matéria seca de mudas de dendezeiro em função do tempo de pré-viveiro e da percentagem de ocupação da bandeja pelos tubetes.

Este trabalho teve como objetivo verificar a influência do tempo de permanência das mudas no pré-viveiro e da percentagem de ocupação da bandeja pelos tubetes no crescimento e na partição de matéria seca de mudas de dendezeiro