Instituto Federal Minas Gerais

Congonhas, Brazil

Instituto Federal Minas Gerais

Congonhas, Brazil
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Pimenta A.,Instituto Federal Minas Gerais | Pimenta A.,Federal University of Minas Gerais | Nametala C.A.L.,Instituto Federal Minas Gerais | Nametala C.A.L.,Federal University of Minas Gerais | And 2 more authors.
Computational Economics | Year: 2017

Stock market automated investing is an area of strong interest for the academia, casual, and professional investors. In addition to conventional market methods, various sophisticated techniques have been employed to deal with such a problem, such as ARCH/GARCH predictors, artificial neural networks, fuzzy logic, etc. A computational system that combines a conventional market method (technical analysis), genetic programming, and multiobjective optimization is proposed in this work. This system was tested in six historical time series of representative assets from Brazil stock exchange market (BOVESPA). The proposed method led to profits considerably higher than the variation of the assets in the period. The financial return was positive even in situations in which the share lost market value. © 2017 Springer Science+Business Media New York


Evangelista W.L.,Instituto Federal Minas Gerais | De Fatima Tinoco I.,Federal University of Viçosa | De Souza A.P.,Federal University of Viçosa | Minette L.J.,Federal University of Viçosa | And 3 more authors.
Work | Year: 2012

Companies have increasingly sought strategies that will ensure a more competitive position in the marketplace. Among these strategies adopted by companies include the health and welfare of the worker, factors currently valued by consumers, especially those of most demanding market. Thus, the postural analysis is of great importance and interest because it is the study of positioning related to body parts like head, torso and limbs, capable of producing loads that may be excessive or insufficient causing disturbances in the muscle skeletal system worker. The aim of this study was to perform a postural analysis of the main sectors of workers (slaughter, cutting room, special cuts, packaging and dispatch) of a typical refrigerator pig industry in Brazil during the execution of their daily activities as well as developing proposals to minimize and/or eliminate the diseases and accidents. The study followed the safety norms of Brazilian Ministry of Labor and Employment. The posture analysis used the OWAS (Ovako Working Posture Analyzing System) methodology. The postures assumed by workers in the sector of packaging were as the most in need of emergency and quick action. © 2012 - IOS Press and the authors. All rights reserved.


PubMed | Parque Zoologico Municipal Quinzinho de Barros, Instituto Federal Minas Gerais, São Paulo State University and Federal University of Pernambuco
Type: Journal Article | Journal: Brazilian journal of biology = Revista brasleira de biologia | Year: 2016

Paca (Cuniculus paca Linnaeus, 1766) is the second largest rodent found in Brazil. The quality of the meat and a long tradition of hunting have contributed to the decline of the natural populations of this species. Hunting of paca is strictly prohibited in Brazil, but in spite of this restriction, no forensic tools are available for the identification of the meat. We describe an efficient method, based on single nucleotide polymorphisms of the cytochrome b gene, that can be used to differentiate biological material derived from paca from those of domestic species commonly used as sources of meat. The identification of the presence of C. paca in the samples was 100% reliable.


PubMed | Parque Zoologico Municipal Quinzinho de Barros, Instituto Federal Minas Gerais, São Paulo State University and Federal University of Pernambuco
Type: | Journal: Brazilian journal of biology = Revista brasleira de biologia | Year: 2016

Paca (Cuniculus paca Linnaeus, 1766) is the second largest rodent found in Brazil. The quality of the meat and a long tradition of hunting have contributed to the decline of the natural populations of this species. Hunting of paca is strictly prohibited in Brazil, but in spite of this restriction, no forensic tools are available for the identification of the meat. We describe an efficient method, based on single nucleotide polymorphisms of the cytochrome b gene, that can be used to differentiate biological material derived from paca from those of domestic species commonly used as sources of meat. The identification of the presence of C. paca in the samples was 100% reliable.


Braga R.A.,Federal University of Lavras | Gonzalez-Pena R.J.,University of Valencia | Marcon M.,Instituto Federal Minas Gerais | Magalhaes R.R.,Federal University of Lavras | And 3 more authors.
Optics Communications | Year: 2016

The adoption of digital speckle pattern shearing interferometry, or speckle shearography, is well known in many areas when one needs to measure micro-displacements in-plane and out of the plane in biological and non-biological objects; it is based on the Michelson's Interferometer with the use of a piezoelectric transducer (PZT) in order to provide the phase-shift of the fringes and then to improve the quality of the final image. The creation of the shifting images using a PZT, despite its widespread use, has some drawbacks or limitations, such as the cost of the apparatus, the difficulties in applying the same displacement in the mirror repeated times, and when the phase-shift cannot be used in dynamic object measurement. The aim of this work was to create digitally phase-shift images avoiding the mechanical adjustments of the PZT, testing them with the digital shearography method. The methodology was tested using a well-known object, a cantilever beam of aluminium under deformation. The results documented the ability to create the deformation map and curves with reliability and sensitivity, reducing the cost, and improving the robustness and also the accessibility of digital speckle pattern shearing interferometry. © 2016 Elsevier B.V. All rights reserved.


Sales J.F.,Federal University of Goais | Pinto J.E.B.P.,Federal University of Lavras | de Oliveira J.A.,Federal University of Lavras | Botrel P.P.,Federal University of Lavras | And 2 more authors.
Acta Scientiarum - Agronomy | Year: 2011

This study evaluated the effect of light, temperature, physiologic stage at harvest and length of time on the germination of Hyptis marrubioides seeds. Two trials were conducted. The first experiment was performed immediately after the seed harvest and consisted of a 2 x 3 x 3 factorial design with 2 environmental conditions (light and dark), 3 temperatures (20, 30 and 20/30°C) and 3 seed harvest times (green colored seeds, light brown seeds and dark brown seeds). The second experiment was conducted in the presence of light at a temperature of 30°C and consisted of a 4 x 3 factorial design, with 4 storage times (0, 6, 12 and 18 months) and the 3 three harvest physiologic stages used in the previous experiment. Both of the experiments were conducted in randomized blocks, with 4 replications of 100 seeds. Light did not affect germination. By contrast, a temperature of 20°C retarded the germination process, although the percentage of germinating seeds was not affected. Seed storage and the different harvest physiologic stages affected the Speed of germination index (SGI) and the germination percentage. Seeds that were harvested at the more mature stage (dark brown color) could be stored for up to 18 months.


Moretti B.S.,Federal University of Lavras | Neto A.E.F.,Federal University of Lavras | Pinto S.I.C.,Instituto Federal Minas Gerais | Furtini I.V.,Federal University of Lavras | Magalhaes C.A.S.,Embrapa Roraima
Cerne | Year: 2011

In order to evaluate nutritional requirements and the effect of nutrient deprivation on the development of seedlings of Australian cedar (Toona ciliata M. Roem var. australis), a greenhouse experiment was conducted. The substrate used was a dystroferric red latosol with low nutrient availability, using 15 treatments and applying the missing element technique. The experiment included two complete treatments (one provided N, P, K, S, B, Cu, Zn with limestone while another provided N, P, K, Ca, Mg, S, B, Cu and Zn without limestone), besides deprivation of each nutrient (-N, -P, -K, -Ca, -Mg, -S, -B, -Cu and -Zn), one treatment with combined deprivation of B, Cu and Zn, one treatment applying limestone only, one treatment applying N, P, K, S, B, Cu and Zn, without limestone, and one absolute control treatment (natural soil). The following characteristics were evaluated: height, diameter, shoot dry matter and root dry matter, and nutrient content in the shoot dry matter after 150 days. Australian cedar plants have high nutritional requirements, and nutrients P, N, S, Ca, K, Mg and Cu, in that order, were found to be limiting factors to plant development. B and Zn deprivation did not affect plant development. Limestone application was essential for the development of Australian cedar plants. Initial deficiency symptoms were found to be the result of S, limestone and N deprivation.


Soares V.C.,Instituto Federal Minas Gerais | Bianchi M.L.,Federal University of Lavras | Trugilh P.F.,Federal University of Lavras | Hofler J.,Federal University of Lavras | Pereira A.J.,Federal University of Lavras
Cerne | Year: 2015

In the present studied was investigated hybrids of Eucalyptus grandis x Eucalyptus urophylla in three different ages. Wood and charcoal characteristics as well as the influence of wood characteristics on the charcoals produced were evaluated. Chemical analyzes (extractives, lignin, ash, elemental analysis), basic density and calorific value - PCS were performed for wood. The charcoals were produced in a muffle type furnace with a heating rate of 1.67 °C.min-1 and an end temperature of 450 °C. Volatile material content, ash content, fixed carbon content, elemental analysis and gravimetric yield of the pyrolysis process were performed for the charcoals. An increase in density values , extractives content, carbon content and C/H rate were observed with the maturity of the tree. Other features such as ash content and S/G ratio decreased with the age of the tree. Greater gravimetric yield in charcoal and non-condensable gases were found in more mature materials. © 2015, Federal University of Lavras. All rights Reserved.


Dias F.P.,Instituto Federal Minas Gerais | De Carvalho A.M.,Federal University of Lavras | Mendes A.N.G.,Federal University of Lavras | Vallone H.S.,Federal University of Triângulo Mineiro | And 2 more authors.
Semina:Ciencias Agrarias | Year: 2013

This study evaluated the development of seedlings of Coffea arabica cvs. grafted in Apoatã IAC 2258 (Coffea canephora). The experimental design used was a randomized block with a 7x 3+2 factorial arrangement. Were utilized seven C. arabica cultivars (Obatã IAC 1669-20, Acauã, Oeiras MG 6851, Catucaí Amarelo 2SL, Topázio MG 1190, IBC Palma II and Paraíso MG H 419-1), three kinds of seedlings (grafted, self grafted and ungrafted) and two Apoatã IAC 2258 rootstocks control (ungrafted and self grafted). There were evaluated the plant height, leaf area, aerial parts dry matter and root system dry matter. The ungrafted seedling showed the best development for all the evaluated characteristics. The effects of ungrafted and self grafted varies depending on the genotype grafted. The IBC Palma II cv. has behavior indifferent to the type of change which is produced for the trait height. There is a difference in behavior of the root system of the rootstock depending on the cultivar used as a graft. The grafts Obatã IAC 1669-20, Acauã or Oeiras MG 6851 can be recommend for use in areas infested with nematodes.


Rosa G.M.,Instituto Federal Minas Gerais | da Luz J.A.M.,Federal University of Ouro Preto
Revista Escola de Minas | Year: 2011

The behavior of batch grinding of a dry binary mix using dolomite and quartz has been studied. Through several tests with different proportions of these minerals and different grinding cycles, the granular system evolution was observed in terms of sharpness coefficient and mean diameter d50. These parameters were fit into the Hill's sigmoidal function of probability distribution to adjust the results. The results were used for the validation of a neural network system (multilayer perceptron-like algorithm), which will be presented in another article.

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