No abstract

This paper proposes the design and construction of a didactic vending machine, students pretend to be immersed in a work with delivery date as many companies that work for projects do. The project of vending machine to be developed will have as parameters that dispatch four different products, with a control panel, a 16 x 2 LCD screen which shows the cost of the chosen product or product, will have to give change and its data processing is via Arduino, a 3D simulation is carried out to ensure the compatibility of all components, an innovation presented by the prototype to be developed is that it sends a text message when a product is about to run out, with the product description, the number of machine and its location, this provides the supplier with better control over their large-scale machines. A comprehensive financial investment analysis is performed to ensure the viability of the project.

This article aims to determine the electrical parameters of the transmission lines, it will focus on the calculation of geometric inductance and capacitance. For this, the cases of the single-phase and three-phase lines with equilateral spacing are studied. The COMSOL Multiphysics program is used to obtain the parameters of the lines. The simulation results are compared with the classic basic equations.

This article presents a model in the frequency domain for the analysis of the transient induced overvoltage transfer to the secondary of a single-phase transformer, as well as the distribution of the transient voltage along both windings. The transformer is modeled as an element of distributed parameters from the telegraphist's equations in the frequency domain. The Laplace Numerical Transform (TNL) is used to obtain the solution in the time domain.