Waste generation has increased in many sectors given the demand and population growth. Reverse logistics comes to contribute to the return of these wastes to the production chain. In this context, frying oil is one of the most processed waste and transformed into new products, such as: biofuel, boiler fuel, soap manufacturing, concrete formwork release agent etc. Oil is one of the wastes whose recycling only happens by law, because it has low added value, unlike plastic, aluminum and copper, whose values ​​are higher. The average oil consumption in Brazil reaches 3 billion liters per year, but only 2.5% of this total is recycled, the others are discarded in the wild. The aim of this study is to analyze Reverse Logistics at different points, seeking to describe the chain steps, from the final consumer, through the PEV and ending in the companies that will reuse the frying oil already treated. In Manaus, the logistics of frying oil is done by cooperatives and private companies, being MASSEG, the largest company in the segment. This research has an explanatory character, approaching a case study, which made it possible to observe the financial and environmental feasibility of reverse logistics for the collection of frying oil, carried out at Condomínio Shopping Manauara Center, in the city of Manaus, AM. To reverse this scenario, many companies are investing in the reverse logistics process. Procedures such as leaving drums empty so that they are filled with waste oil, separation of solid waste and water from oil, are already part of the routine of tenants that also contribute to non contamination of water bodies. The collection, transportation, filtering, decantation and commercialization of the product already treated, for fuel purposes, is performed by the company itself. Finally, the company uses part of the treated oil to manufacture biodiesel, applied to the consumption of its own fleet, with no commercialization of the generated biodiesel. Thus there is a reduction in the use and costs with usual fuels (fossils), seeking to add the culture of sustainability.

The article active methodology: From the text to the context - A possible approach - consists of a bibliographic essay that relates didactic procedures denominated of active methodologies with the epistemological principles of the main progressive pedagogical tendencies, giving them theoretical and scientific support and constituting like a methodological didactic alternative capable of satisfying the peculiarities of the current social context and pedagogical relations that values the student and places it at the center of the process of teaching and learning meaningful .. The study searches in the studies of authors that resort to the basic assumptions of the New School Movement (From the late nineteenth century and early twentieth century) and from Vygotsky's Theories (1896-1934), Dewey (1859-1952), Ausubel (1918-2008) and Paulo Freire (1921-1997) and their association of principles in active methodologies as well as technically sound didactic procedures that can be pedagogical practices.

The objectives of this study were to analyze whether teachers are working with practical classes using scientific experiments in science teaching, to list the reasons why science classes in elementary school have few experiments and to propose improvements for a better effectiveness of classes, taking into account view the benefits of practical classes in teaching learning. To achieve the objectives, a quantitative methodology was used through a questionnaire for data collection at a school in the Municipality of Grajaú-MA, 148 students from the 8th and 9th grade answered the questionnaire. The results obtained are displayed in the form of graphs, in which it was possible to notice that students like classes with experiments, however the school has no structure so that students can practice this type of class more often. It is concluded that the practical classes with scientific experiments have been applied even if little and that this index of classes can increase a lot, being necessary measures for this to circumvent or alleviate the problem of not having adequate structure and equipment in the school for classes with experiments . One way to improve the current situation is the partnership between the school that was the object of study and higher institutions that can help with equipment or technical visits.

It is apparent the industrial processes transformations caused by industry 4.0 are in advance in some countries like China, Japan, Germany and United States. But, in return, the developing countries, as the emergent Brazil, seem like to have a long way to achieve digital era. Considering manufacturing processes as the starting point the rise of industry 4.0, this research aims to show a review about the most important technologies used in smart manufacturing, including the main challenges to implement it at Brazil. The papers were collected from Web of Science (WoS), comprising 114 articles and 2 books to underpin this study. This exploratory research resulted in the presentation of some challenges faced by Brazilian industry to join the new industrial era, such as poor technological infrastructure, besides lack of investment in technologies and training of qualified people. Even though the primary motivation of this research was to present a panorama of smart manufacturing for Brazil, this study results contributes to the most of emergent countries, bringing together general concepts and addressing practical applications developed by several researchers from the international academic community.

Predictive as well as preventive maintenance are tools of maintenance programs that aim to increase or maintain the life expectancy of an equipment through computational techniques and tools. Bearing in mind that the power generation industry has a high maintenance rate with machines and / or electric generators stopped, this research aims to develop a computational model for predicting the Reliability Key Performance Indicator (KPI) to identify how available the equipment will be in a time span of 22 days, for this the methodology to be used will be based on analyzes and tests of artificial neural network (ANN) architectures using the Bayesian Regularizers training algorithm, alternating the transfer functions in the layers hidden to find the best state of convergence and the minimum Root Mean Square Error (RMSE) value calculated between the real and simulated outputs. According to the results obtained by the training, validation and test steps, the algorithm presented a RMSE rate of 0.0000104202 and a 99.9% correlation between the real and simulated values, thus the model is able to identify which machine will have the greatest efficiency and less efficiency within the defined time span.

Analisar métodos de processamento de dados e garantir resultados coerentes é um trabalho árduo para os cientistas, o fato é que a otimização de um processo faz a diferença independente de qual área esteja sendo trabalhada. Existem ferramentas que consolidam estudos como esse, uma delas é o método comparativo utilizando análise de dispersão que foi utilizado na presente pesquisa ao trabalhar com o aplicativo Aventureiros Escolares que é o um dos objetos de estudo, com ele foi analisado o agente de inferências denominado Fuzzylite. O estudo de caso foi uma boa opção para a pesquisa ao analisar os métodos de inferência modelados no app e realizar uma comparação com o Toolbox Fuzzy do MatLab®, com isso o objetivo da presente pesquisa é analisar as duas ferramentas citadas e apontar qual delas teve o melhor desempenho utilizando a mesma modelagem Fuzzy. Por meio da análise de dispersão foi possível identificar um melhor resultado para o modelo empregado no Fuzzylite.

The escape route is used to indicate the emergency exit, leading to the exit, stairs, fire doors and not obstructing them. In all companies there is a use of signs that indicate an escape route in emergencies. These plates are made of special materials that allow the visualization of the same case of power failure. The batteries contain a special ink or film that is being charged by ambient light. The values are varied from material to material and should be analyzed according to a demand definition.

The main objective of the article was to highlight the importance of the spring to Mindu Municipal Park, as well as, propose solutions to the problems that were observed on the spot, the research aimed to demonstrate the activities aimed at spring recovery and revitalization of areas affected by degradation. The collections were performed three times a week over two months, from March to April 2018. Being possible to verify the conditions of the environment and how it was before the application of the Park's revitalization and maintenance activities. Being possible to delimit the first activities that will be applied to realize the restructuring and revitalization of the space. With the project initiative, more visitors were found in the Park, and with each step completed, awareness grew about the importance of environmental preservation. Therefore, encouraging visitors to participate in social and environmental activities is essential to sustain the site.