Revista Facultad de Ingenieria

In the search of sustainable process and products, ecofriendly policies have been developed over the years, aiming at reducing the environmental impacts as a step toward sustainability. Among the environmental impacts, alternatives to mitigate the greenhouse gas emissions - GHG stand out due to the concerns with climate change. Then, the development and use of renewable resources become relevant. Considering that supply chains are intense in energy consumption and GHG emissions (since involves processes related to supply, production, transport, consumption), it becomes relevant to investigate if the management of sustainable supply chain are considering the renewable energies in their processes. Therefore, this paper aims at mapping the role of renewable energies in the context of sustainable supply chain, analyzing the literature published at Web of Science database - WoS about the subject. The main researchers, organizations, collaboration networks were presented, and the 21 most cited studies were mapped in this paper. The research was carried out with the papers published at WoS until 2019, using VantagePoint software to handle information. The findings show that the research about renewable energy in the context of sustainable supply chain has been growing, especially since 2010. Moreover, biomass, biofuels and photovoltaic energy were the most recurrent sources of renewable energy studied by most cited papers. However, the theme presented itself as new and that there are still potential to be explored.

The purpose of this article was to establish the association between exposure to particulate matter and respiratory symptoms evaluated in students who remain in schools at the municipality of Guachetá (Colombia). This is a cross-sectional study conducted on children between 4 and 17 years old, in two schools in the municipality of Guachetá. During a period of 11 consecutive working days, using a personal sampling pump and a low-cost real-time sensor, concentrations of PM10 and PM2.5 were measured. A survey was applied to a sample of 276 students, obtaining respiratory symptoms and general data. A prevalence ratio (PR) was estimated to show the possible association between exposure to particulate matter and respiratory symptoms. The school with the highest concentrations of particulate matter presented a possible association with all the respiratory symptoms evaluated in the school facilities, with a PR of 3.05 (95%CI:1.62-5.76) for cough, 1.85 (95%CI:1.06-3.24) for phlegm, 5.12 (95%CI:2.17-12.07) for shortness of breath, 3.83 (95%CI:2.07-7.10) for sneezing and 2.25 (95%CI:1.12-4.54) for dry nasal passages. In conclusion, children who are located in the school closest to a coke furnace and disrepair roads where heavy traffic circulates, are possibly associated with the presence of respiratory symptoms during their stay in the school facilities. For living in the urban area, cooking with firewood or charcoal, and living with smokers at home, a possible association with the evaluated respiratory symptoms was found.

In this paper, the water pumping regime, as well as the water consumption regime with regard to the required quantities and the example of water consumption, with an emphasis on changes in water volume, are examined. This aims to show the functioning of the regime of water consumption, water pumping, as well as finding functional relationships between the mentioned sizes and the volume of the water reservoir. The analysis focuses on questions such as how and in what way, changes in the onset and duration of pumping, as well as different water consumption regimes affect the size of the reservoir volume. The entire analysis in this paper was done to develop a scientifically innovative, but also applicable mathematical model, which is a contribution to the profession and a good basis for further scientific research to improve the operation of the urban water supply system.

The first free-access electronic scientific journals appeared with the creation of the Internet, before the invention of the world wide web. In 1991, Surfaces and Psycoloquy were pioneering journals featuring free internet content and ensuring the copyright of the authors (as would later be said in the Budapest declaration or in the Berlin declaration) [1]. Another example was The Public-Access Computer Systems Review, an electronic journal established in 1991, also committed to spreading Open Access (OA). One of the articles published in the first issues of this journal entitled "Online journals: disciplinary designs for electronic scholarship" described what would happen a few years later: the Internet or other networks would be the vehicle for scientific communication; the digital world would allow an acceleration in the dissemination of science compared to the printed era and that the cost of electronic publication would be lower than the printed version, therefore it could reach a greater number of users [2].