Federal Institute of Minas Gerais

Brasília de Minas, Brazil

Federal Institute of Minas Gerais

Brasília de Minas, Brazil

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Januario Mendes J.,Federal University of Ouro Preto | Januario Mendes J.,Federal Institute of Minas Gerais | Cunha A.A.,Federal University of Ouro Preto | da S. Araujo F.G.,Federal University of Ouro Preto
Advanced Materials, Structures and Mechanical Engineering - Proceedings of the International Conference on Advanced Materials, Structures and Mechanical Engineering | Year: 2016

The evaluation of the behavior lump iron ores during the reduction process in blast furnace reactors is extremely important to determine the system’s productivity. To predict this behavior, one has to evaluate lump ores and pellets relative to chemical composition, physical properties, mineralogy, Reduction Degradation Index (RDI) and Reducibility Index (RI). This paper presents the evaluation of the chemical and metallurgical qualities of brazilian lump iron ores, when subjected to the reducing conditions present in the blast furnace. The procedures of the metallurgical tests are standardized by ISO and are performed in automated metallurgical testing ovens that allow real-time monitoring. The results obtained from the metallurgical tests permited to assess the differences in quality of three typologies of lump ores and how this may influence the productivity of the reactors. © 2016 Taylor & Francis Group, London.


Da Silva S.,Federal University of Santa Catarina | Moreira B.,Federal Institute of Minas Gerais | Da Costa N.,Federal University of Santa Catarina
PloS one | Year: 2014

We replicate the Stanford marshmallow experiment with a sample of 141 preschoolers and find a correlation between lack of self-control and 2D:4D digit ratio. Children with low 2D:4D digit ratio are less likely to delay gratification. Low 2D:4D digit ratio may indicate high fetal testosterone. If this hypothesis is true, our finding means high fetal testosterone children are less likely to delay gratification.


Da Silva S.,Federal University of Santa Catarina | Moreira B.,Federal Institute of Minas Gerais | Da Costa N.,Federal University of Santa Catarina
PLoS ONE | Year: 2014

We show that preschoolers exhibit the endowment effect as evidenced by experiments where children generally chose to keep their own toys rather than trading them for similar ones. Furthermore, we relate the emergence of this effect to children's innate psychobiological traits-emotional state, gender, handedness, and digit ratio. The trials were conducted with 141 children across 6 kindergartens. We also found support that children, like adults, exhibit a preference for physical possession as opposed to ownership. As with adults, emotions also seem to matter, as children who were described as quiet and calm were more likely to present the endowment effect. Also of note, right-handed children described as quiet were more likely to exhibit the phenomenon. Furthermore, female children were generally found to be calmer than males, while males tended to be more fearful than females. This result was also previously found in teenagers. © 2014 Da Silva et al.


Pereira L.E.S.,Federal Institute of Minas Gerais | Da Costa V.M.,Federal University of Juiz de fora
International Journal of Electrical Power and Energy Systems | Year: 2014

This paper proposes a simple and efficient power flow method to calculate, in an interval manner, the main variables corresponding to the maximum loading point, under load data uncertainties. The resulting interval nonlinear system of equations is solved using Krawczyk method. The proposed methodology is implemented in the Matlab environment using the Intlab toolbox. Results are compared with those obtainable by Monte Carlo simulations. IEEE 30 bus system and a South-southeastern Brazilian network are used to validate the proposed methodology. © 2013 Elsevier Ltd. All rights reserved.


Pereira L.E.S.,Federal Institute of Minas Gerais | Da Costa V.M.,Federal University of Juiz de fora
International Journal of Electrical Power and Energy Systems | Year: 2016

This letter proposes a simple and efficient starting process to be used in the interval power flow current injection at the maximum loading point. Load and line data uncertainties are considered. The proposed method is implemented in the Matlab environment using the Intlab toolbox. The main variables associated with the power flow problem are yielded in an interval form. Results are compared with those obtainable by Monte Carlo simulations. A large scale South-southeastern Brazilian network is used to validate the proposed starting process. © 2016 Elsevier Ltd. All rights reserved.


Mapa S.M.S.,Federal University of Minas Gerais | Mapa S.M.S.,Federal Institute of Minas Gerais | Urrutia S.,Federal University of Minas Gerais
Information Processing Letters | Year: 2015

Disjunctively constrained versions of classic problems in graph theory such as shortest paths, minimum spanning trees and maximum matchings were recently studied. In this article we introduce disjunctive constrained versions of the Maximum Acyclic Subgraph problem. Negative disjunctive constraints state that a certain pair of edges cannot be contained simultaneously in a feasible solution. Positive disjunctive constraints enforces that at least one arc for the underlying pair is in a feasible solution. It is convenient to represent these disjunctive constraints in terms of an undirected graph, called constraint graph, whose vertices correspond to the arcs of the original graph, and whose edges encode the disjunctive constraints. For the Maximum Acyclic Subgraph problem under Negative Disjunctive Constraints we develop 1/2-approximative algorithms that are polynomial for certain classes of constraint graphs. We also show that determining if a feasible solution exists for an instance of the Maximum Acyclic Subgraph problem under Positive Disjunctive Constraints is an NP-Complete problem. © 2014 Elsevier B.V. All rights reserved.


PubMed | Federal Institute of Minas Gerais and Federal University of Lavras
Type: Journal Article | Journal: Journal of dairy science | Year: 2016

The Serra da Canastra region, located in southwestern Minas Gerais, Brazil, is recognized worldwide for its tradition of producing artisanal cheeses. However, as production is done by hand, great variability exists in the characteristics of artisanal Minas cheese. Thus, it is important to characterize the sensory profile of these products and verify the quality attributes that lead to their acceptance. Therefore, this study aimed to characterize the dynamic sensorial profile of artisanal Minas cheese produced in the Serra da Canastra region through temporal dominance of sensations and sensory acceptance tests and verify the attributes that lead to product quality. We observed that the texture and flavor profile varied among the evaluated artisanal Minas cheeses from Serra da Canastra, some cheeses being more characterized by creamy and soft or hard and firm sensations, whereas others had high dominance rates for crumbly texture. In relation to flavor, salty and bitter tastes were dominant in most cheeses, some also being characterized by a sour taste, and others by buttery and rancid attributes, which indicates a lack of product standardization. However, all samples obtained scores between 6 (liked slightly) and 7 (liked moderately), indicating good acceptability in relation to the texture and flavor of the evaluated cheeses. Moreover, it is possible to infer that creamy and soft or hard and firm are positive attributes for cheese texture, and bitter, buttery, salty, and acid taste drive cheese acceptance. This study provides important information for product standardization, quality improvement, and process origin indications, besides providing quality attributes that meet consumer desires.


Rangel D.A.,Federal Institute of Minas Gerais | Leite M.S.A.,Federal University of Paraiba
IIE Annual Conference and Expo 2015 | Year: 2015

Despite the growing number of studies, gaps are noted in identification and risk assessment steps on the Supply Chain Risk Management (SCRM) implementation. By analyzing 21 studies on SCRM implementation, gaps were identified in the following aspects: (1) Risk components, (2) Data type approach used to assess risk (qualitative and/or quantitative), (3) Existence of influence among risks and (4) result expected after the risk assessment process. Thus, a structure was defined to assess risk, which breaks it down into different events. Each event is characterized by impact (performance indicators) and probability (number of occurrences) seeking to combine qualitative and quantitative aspects in of the identification step. The use of Analytic Network Process (ANP) is also indicated for the analysis of the influence among risk types in the assessment step. Finally, after defining these principles, it is suggested a procedure that includes (1) understanding of the supply chain, (2) identification of risks, (3) recording of risk occurrence data (impacts and occurrence), (4) assessing the risk impact with ANP, where risks are the alternatives and indicators are the criteria, (5) calculation of the probability, (6) setting of the risk criticality index (Probability x Impact) and hence prioritizing risks with the highest rates.


PubMed | Federal University of Ouro Preto and Federal Institute of Minas Gerais
Type: Review | Journal: Biomedical journal | Year: 2016

Infection by protozoan parasites is part of the most common Tropical Neglected Diseases. In the case of leishmaniasis, several millions of people are at risk of contracting the disease. In spite of innumerous studies that elucidated the immune response capable of killing the parasite, the understanding of the evasion mechanisms utilized by the parasite to survive within the very cell responsible for its destruction is still incomplete. In this review, we offer a new approach to the control of the immune response against the parasite. The ability of the parasite to modulate the levels of extracellular ATP and adenosine either by directly acting on the levels of these molecules or by inducing the expression of CD39 and CD73 on the infected cell may influence the magnitude of the immune response against the parasite contributing to its growth and survival.


Silva E.P.,Federal Institute of Minas Gerais | Reis K.E.G.,Federal Institute of Minas Gerais | Evangelista W.L.,Federal Institute of Minas Gerais
Occupational Safety and Hygiene IV - Selected, Extended and Revised Contributions from the International Symposium Occupational Safety and Hygiene, 2016 | Year: 2016

This study aims to verify the applicability of the requirements established by Regulatory Norm 25 (NR 25) related to industrial waste in a tannery located in southwestern Minas Gerais. An overview referring to the items treated by the standard in order to present important information about the verification of compliance and non-compliance of production processes. Was used the direct observation, interview, photographic and video records. There was also a case study the processing of tanning and finishing from leather, as well an exploratory research. It was verified the parameters addressed by NR 25 about the solid, liquid and gaseous wastes derived from production processes the enterprise. It emphasizes the disposal of solids wastes and gas emission control as the particulate material. It was noted the responsibility of the company give continuity the treatment of waste derived from the production process, as well as compliance with the mitigation measures to reduce environmental impacts. © 2016 Taylor & Francis Group, London.

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