Ronilson Rocha

A methodology for the teaching of dynamical systems using analogous electronic circuits

The behaviour of dynamical systems can be reproduced from analogous electronic circuits, which allows the study of many interesting phenomena associated with them using inexpensive and versatile electronic components easily found on the market. This paper proposes a methodology to develop didactic platforms for the study of dynamical systems based on analogous electronic circuits. Presented here are the design and implementation of three electronic circuits that mimic natural chaotic systems: the forced Duffing system, the Lorenz system and the Rössler system.

Desenvolvimento de ferramenta computacional para auxílio ao projeto de gemas lapidadas

This paper presents a study on a Computer-aided-design (CAD) tool for lapidary design. The material chosen is rock crystal quartz. Aspects of historical development of gemstone lapidary, faceting diagrams and faceting parameters are presented. Two criteria are proposed to assess the efficiency of a given lapidary design: brilliance and yield. To estimate these two results, the tool developed is based on artificial neural networks. Tests with 62 different lapidary designs were used to validate the proposed CAD tool.

Aplicação de redes neurais artificiais na estimação de parâmetros em projetos de gemas lapidadas

This paper deals with the problem of parameters estimation on faceted gemstones projects. The proposed approach applies artificial neural networks on a Computer-aided-design (CAD) tool for lapidary design. Basic concepts concerning gemstone processing and faceting diagrams are introduced. Two criteria are proposed to assess the efficiency of a given lapidary design: brilliance and yield. The material chosen is rock crystal quartz. Tests with 62 different lapidary designs were used to validate the

Analogia eletrônica no ensino de física

This work introduces a procedure for analogue electronic circuits design that emulate the dynamic behavior of physical and mathematical systems. Such circuits can be applied as a practical approach for didactic experiments, and easily settled at any laboratory. As instance, electronic version of Duffing and Rossler chaotic systems are designed and implemented, resulting in simple, low cost, robust and functional prototypes.