The Doppler effect is a phenomenon which relates the frequency of the harmonic waves generated by a moving source with the frequency measured by an observer moving with a different velocity from that of the source. The classical Doppler effect…

An experimental apparatus was designed and built to allow students to carry out heat conduction experiments in hollow cylinders made of different materials, as well as to determine the thermal conductivity of these materials. The evolution of the temperature difference…

The first-order harmonic balance method via the first Fourier coefficient is used to construct two approximate frequency–amplitude relations for a conservative nonlinear oscillatory system in which the restoring force has an irrational form. This system corresponds to the motion of…

Accurate recording of computer-generated holograms (CGH) on a phase material is not a trivial task. The range of available phase materials is large, and their suitability depends on the fabrication technique chosen to produce the hologram. We are particularly interested…

An approximate scheme for obtaining the period of a simple pendulum for large-amplitude oscillations is analysed and discussed. When students express the exact frequency or the period of a simple pendulum as a function of the oscillation amplitude, and they…

Estudos indicam que produtos similares ao chocolate podem ser elaborados com amêndoas de cupuaçu, com possibilidades promissoras de mercado. Neste trabalho, produziu-e um produto análogo de chocolate ao leite, com 50% de substituição de liquor e manteiga de cacau por…

De sementes fermentadas e secas de cupuaçu (Theobroma grandiflorum Schum.) pode-se produzir um produto semelhante ao liquor de cacau, denominado liquor de cupuaçu, que pode ser usado como ingrediente na elaboração de produtos análogos ao chocolate, bolos, biscoitos e sorvetes.…