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The design and visualization of the distribution of atoms in a fraction of space through the application of software allows us to increase the understanding of the structure of materials and the elaboration of theoretical propositions. The purpose of this work was to develop a procedure for the application of the GeoGebra 3D software as a tool for designing crystalline structures, from the Mathematics subject for Chemical Engineering students. A workshop called GeoCristal was held to reflect experiences on the use of GeoGebra 3D. Based on a sequence of tasks, the students designed a BCC crystal structure related to alpha iron in the software. The experience demonstrated the usefulness of the software for the design of crystalline structures. It made possible to promote and systematize essential contents of Materials Engineering. Managed to increase students' motivation for Mathematics. The study reflected the importance of the use of ICTs and basic subjects in the training of chemical engineers. [ABSTRACT FROM AUTHOR]

This paper aims at studying the apprehensions and modifications of an elliptic paraboloid in the Dynamic-Graphic Register (DGR) through the environment of dynamic representations Geogebra 3D. To do that, we take aspects from Duval's Theory of Registers of Semiotic Representation as well as a study on paraboloid visualization as a benchmark. We configured the DGR of the elliptic paraboloid and analyzed how apprehensions and modifications develop in such register. We concluded stating that developing apprehensions in tasks that involve the notion of elliptic paraboloid can be done in the DGR, and we empathize that this type of research can be realized with other mathematical objects that may be represented in such register. [ABSTRACT FROM AUTHOR]