Dilute-phase pneumatic conveying of polystyrene particles: pressure drop curve and particle distribution over the pipe cross-section

During the pneumatic conveying of plastic pellets, it has been observed that materials with similar physical characteristics may develop a substantial difference in pressure drop. In this work, the pressure drop in a particle-laden 2.7 meter long horizontal channel with circular cross-section is presented from an experimental perspective. Experiments are carried out for cylindrical polystyrene beads with an average diameter of 3.2 mm and mass loadings of 0.06 to 0.11 (kg particles/kg gas). The air mass flow rate was studied in the range from 0.085 kg/s to 0.170 kg/s. The pressure drop curve is shown as a function of air velocity and particle load. Response surface methodology showed high statistical significance for air velocity, particle load and their cross-relation.8188Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Comportamento produtivo de babacual em um aluviao eutrofico, em Teresina-PI.

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Incidência de parasitismo em adultos de percevejos fitófagos em Goiás.

O objetivo deste trabalho foi determinar a incidência natural de parasitóides em ninfas e adultos de várias espécies de percevejos

Formação de base de dados para identificação do potencial de fixação biológica de nitrogênio em leguminosas nativas da Mata atlântica no Estado do Rio de Janeiro.

Publicado também no VII Congresso brasileiro de Sistemas Agroflorestais, 201

Aharonov-Bohm-like effect for light propagating in nematics with disclinations

Using a geometric approach for the propagation of light in anisotropic media, we investigate what effect the director field of disclinations may have on the polarization state of light. Parallel transport around the defect, of the spinor describing the polarization, indicates the acquisition of a topological phase, in analogy with the Aharonov-Bohm effect.Comment: 6 pages, to appear in Europhysics Letter