São Paulo Federal Institute of Education, Science and Technology

About: São Paulo Federal Institute of Education, Science and Technology is a education organization based out in São Paulo, Brazil. It is known for research contribution in the topics: Context (language use) & Computer science. The organization has 1707 authors who have published 2374 publications receiving 11333 citations.

Enhancing intelligence in inter-vehicle communications to detect and reduce congestion in urban centers

Abstract: Cities with a large number of people are currently facing urban mobility problems, especially the problem of traffic congestions. This not only has an adverse effect on the economy of the city, but also impairs the quality of life of its citizens. One measure that can be adopted to mitigate these problems is the use of systems that help identify, reduce, and/or avoid these traffic jams, such as intelligent transport systems. In this context, we propose an intelligent traffic information system called UCONDES, which is based on inter-vehicle communications and can be applied to detect and reduce congestion in urban centers. Simulation results shows that, when compared to original vehicular mobility trace, our solution reduces the average trip time, and the overall CO2 emission and fuel consumption. More specifically, the average travel time for drivers was reduced by approximately 26%, resulting in a reduction of fuel consumption by 23% and the CO2 emission by 25%.

Microbiological quality and physicochemical characterization of Brazilian bee pollen

Abstract: Sixty-two commercial samples of dehydrated bee pollen (Apis mellifera bees) collected in Brazil (eight states and the Federal District) were analyzed for commercial quality (moisture, ash, lipids, proteins, and carbohydrates), and hygiene (aerobic mesophiles, yeasts and molds, coliforms, Escherichia coli, Staphylococcus aureus and sulfite-reducing Clostridium). The analyzed samples were within the regulatory limits established by the legislation for ash, lipid and protein, except for moisture content. The analyzed hygiene parameters evaluated for bee pollen are not regulated by the Brazilian legislation, and the data discussed can contribute to regulatory agencies. Only moderate and weak correlations were observed between dehydrated pollen samples and the parameters evaluated.

On the effect of substrate oscillation on CrN coatings deposited by HiPIMS and dcMS

Abstract: There are plenty of deposition techniques to produce hard coatings. Among them, Direct Current Magnetron Sputtering (dcMS) and High Power Impulse Magnetron Sputtering (HiPIMS) are known to produce dense coatings with few or no growth defects. Transition metal nitrides are widely used for tribological applications. CrN has been described as a high hardness, high wear resistant coating therefore making an ideal candidate to be deposited by sputtering. Although the use of multilayers have been described as a mean to further increase wear resistance, no study has presented the effect of a multilayer produced by the oscillation of the substrate during the deposition process. This paper presents a study of the effect of the oscillation on the production of these multilayer and its effects on the mechanical and structural properties of the coating. Furthermore, the effects of bias and frequency on these properties were evaluated. To characterize the coatings it was used XRD, SEM, AFM, Nanohardness and Corrosion tests. The XRD results showed higher texture on (311) plane for −60 V for HiPIMS deposition for all frequencies leading to higher hardness. Compressive residual stresses were found to grow as the bias increased for HiPIMS deposition, whereas dcMS led to the opposite behavior. Finally, dcMS coatings presented similar corrosion resistance when compared to HiPIMS coatings.