A obra intitulada "Engenharias em foco vol.5", publicada pela Brazilian Journals Publicações de Periódicos e Editora, apresenta um conjunto de quinze capítulos que visa abordar conhecimentos disciplinares ligadas à área temática das Engenharias. A seguir serão apresentados os capítulos que compõem este ebook. Dessa forma, agradecemos aos autores por todo esforço e dedicação que contribuíram para a construção dessa obra, e esperamos que este livro possa colaborar para a discussão e entendimento de temas relevantes para grande área da Engenharia, orientando docentes, estudantes, gestores e pesquisadores à reflexão sobre os assuntos aqui apresentados.

The insertion of electric cars in the autonomous world market is growing. The higher acquisition cost and lower autonomy of electric traction, in relation to internal combustion traction, are still the main factors that restrict the sale of this type of vehicle. Even so, in the long term, the lack of an infrastructure that supports the transition to the electric vehicle matrix, can result in a bottleneck in the change of energy source. Therefore, the main objective of this article is to present, through a literature review, the main challenges related to the implementation of electric vehicles in Brazil. The general challenges described include the study of the storage capacity of more efficient batteries and the comparative analysis between electric, hybrid and conventional cars. Meanwhile, the challenges in Brazil were portrayed from the analysis of the grid and electricity distribution matrix and through statistical data of Brazilian lithium reserves. Thus, it appears that solid-state, lithium-sulfur and lithium-air batteries have theoretical storage capacities superior to the current generation of lithium-ion batteries used in automobiles. It was also possible to verify that it is necessary to increase the supply of electric energy in Brazil, in order to meet the future demand for vehicles powered by the electric grid. In addition, a variety of information relevant to technological development research related to this topic was obtained.

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There is a growing number of studies related to computational fluid dynamics for the construction and optimization of equipment, machines, and systems. In this work, the main knowledge needed to perform an analysis of computational fluid dynamics in airlift-type bioreactors for ethanol production will be addressed.