July 2021

Thick lenses systems

The matrix optics formalism is applied to show that a simple Gaussian equation is enough to relate object and image distances in an optical system consisting of an arbitrary number of thick lenses in cascade immersed in air. First, the case of a single thick lens was studied. Applying sequentially the optical matrixes corresponding to refraction and displacement of the optical ray, and imposing certain conditions on the...

Author(s): Fulvio Andres Callegari

September 2021

Physical-chemical characterization of kanyu almond oil (Sclerocarya birrea) for use as biofuel

Plant oil extracted from Kanyu almonds offers the potential to be an alternative to fossil fuel resources. This study aims to characterize the physico-chemical properties of kanyu almond oil, as safe indicators of the use of this biofuel for energy generators. Samples of the oils examined were density, kinematic viscosity, acid value, and oxidation stability. The experimental results showed that the oils had different...

Author(s): Alberto Julião Macamo, Jardel Lourenço Macuácua and Lina Rafael Langa Macamo