Fundacao Centro Tecnologico Of Minas Gerais

Engineering, Brazil

Fundacao Centro Tecnologico Of Minas Gerais

Engineering, Brazil
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Furlan R.M.M.M.,Federal University of Minas Gerais | Motta A.R.,Federal University of Minas Gerais | Valentim A.F.,Federal University of Minas Gerais | Barroso M.F.S.,Federal University of Säo João del Rei | And 2 more authors.
International Journal of Speech-Language Pathology | Year: 2013

The purpose of the study was to quantify tongue protrusion force and compare its characteristics between participants with severely weak tongues and those with normal lingual strength. The sample consisted of 11 participants with severe lingual strength deficits and 11 age- and sex-matched participants with normal lingual strength. Tongue force was evaluated quantitatively using the Forling instrument, and the average force, maximum force, average force application rate, and area under the graphic curve were analysed. These parameters were compared between the groups. In the participants with severely weak tongues, the average and the maximum forces in N (Newton) were 2.03 ± 1.17 and 3.56 ± 1.77, respectively. The average force application rate in N/s (Newton per second) was 1.25 and the area under the graphic curve in Ns (Newton times second) was 18.6. The values of the participants with normal lingual strength were, respectively, 13.27 ± 6.15 N, 18.91 ± 7.95 N, 10.46 N/s, and 108.08 Ns. All parameters analysed differed significantly between the groups. The data collected could aid speech-language pathologists in diagnosing problems related to tongue force. © 2013 The Speech Pathology Association of Australia Limited.

Aquatic plants and water were collected in five ponds and three rivers in the Espinhaço Range, during the period between December 2001 to August 2003. Ponds: Tanque da Fazenda, Comprida, Arame, Estivinha and Americana. Rivers: Corrento, Taquaral and Preto. The following variables were measured: water temperature, transparency, pH, electrical conductivity, dissolved oxygen, oxygen biochemical demand, oxygen chemical demand, ammoniacal nitrogen, total nitrogen, soluble reactive phosphorous, and total phosphate. In the lothic environmental conductivity values were recorded for Corrento e Preto riverrs and were correlated to the supply of natural nutrients. Considering lenthic environments, Americana e Estivinha ponds showed higher values of electrical conductivity and OCD. The highest value of water transparency was found in the Tanque da Fazenda pond. In the ordering of species, higher richness of macrophytes was observed in the ponds Americana, Estivinha, and Comprida. These presented stronger correlation with the values of temperature, pH and nitrogen concentration. The ordination of biological form suggested that floating species are more common in environments rich in nitrogen and of warmer water. Probably, the diversity of environments found in this study, with different physical and chemical characteristics are reflected in the floristic composition and ecosystem function.

Vasconcelos V.V.,Federal University of Ouro Preto | Junior P.P.M.,Federal University of Ouro Preto | Hadad R.M.,Fundacao Centro Tecnologico Of Minas Gerais
Engenharia Agricola | Year: 2012

The probable recharge zone delimitation of Entre-Ribeiros Basin (Northwest of the state of Minas Gerais / Brazil) is proposed in this study. The delimitation is based upon stratigraphy, geomorphology, geo-environmental domains and hydrogeology studies. Combining the recharge zone map with the land use variation between 1975 and 2008, the occupation trends of possible recharge zones are identified. Concluding, the environmental impacts for this basin are discussed.

Vasconcelos V.V.,Assembleia Legislativa de Minas Gerais | Vasconcelos V.V.,Federal University of Ouro Preto | Martins Jr. P.P.,Federal University of Ouro Preto | Martins Jr. P.P.,Fundacao Centro Tecnologico Of Minas Gerais | Hadad R.M.,Pontifical Catholic University of Minas Gerais
Geologia USP - Serie Cientifica | Year: 2013

The quantification of flow components is important for water resource management. The base, interflow, and runoff flows of nested basins of the Paracatu River (SF-7) were estimated with recursive signal filters in this study. At first, stationary analysis and multivariate gap filling were applied to the flow data. A methodology is presented, proposing filter calibration with the runoff influence and inflection of the recession curve for dry season. Filters are improved with a logic constraint that limits water flow overestimation within algorithm iteration. The results were coherent with previous studies and with hydrogeological and climatological maps.

Pacheco A.G.,Federal University of Minas Gerais | Silva T.M.,Federal University of Minas Gerais | Manfrini R.M.,Federal University of Minas Gerais | Sallum W.S.T.,Federal University of Minas Gerais | And 4 more authors.
Quimica Nova | Year: 2010

From the ethanolic extract of the stem of A. esperanzae ethyl and methyl fatty acid esters, fatty acids, aristolochic I and II acids, and β-cubebin were isolated. In addiction asarinin, populifolic and 2-oxo-populifolic acids, aristolactams AIa and AII, and sitosterol 3-O-β-D-glucopyranoside were also isolated and firstly described in the species. Asarinin and β-cubebin showed antibacterial activity against Bacillus cereus and aristolochic acid I against Staphylococcus aureus and Listeria monocitogenes.

Miranda D.O.,Fundacao Centro Tecnologico Of Minas Gerais | Moura T.D.O.,Fundacao Centro Tecnologico Of Minas Gerais | Santana R.J.,Fundacao Centro Tecnologico Of Minas Gerais | Guimaras G.R.,Fundacao Centro Tecnologico Of Minas Gerais | And 3 more authors.
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2010

In the present work the effect of auxiliary plasma assistance on the structure, composition and optical gap of e-beam vacuum evaporated silicon thin films is investigated. The films were deposited over glass and Silicon wafer substrates, under argon-hydrogen plasma assisted, to verify also the effect of the H2 content, at substrate temperature of 250°C. The species present in the plasmas were investigated using Optical Emission Spectroscopy, while the films were characterized by Raman, FTIR and UV-vis spectroscopy. The results show that the deposition of a-Si:H with high hydrogen content and mc-Si:H through the used low temperature plasma assisted vacuum evaporation. The relationship between crystallinity, optical band gap and species in the Plasma is discussed, considering the effect of molecular and atomic hydrogen content in the plasma, as well as a-Si chemical annealing theories. © 2010 IEEE.

Lopes R.M.F.,Fundacao Centro Tecnologico Of Minas Gerais | Freitas V.L.O.,Fundacao Centro Tecnologico Of Minas Gerais | Filho J.P.L.,Federal University of Minas Gerais
Revista Arvore | Year: 2010

This study aimed to compare the biometry of fruits and seeds, as well as the effect of different scarification, temperature and light conditions on the germination of Plathymenia reticulata Benth. and Plathymenia foliolosa Benth. We measured the length, width, thickness, and fresh mass of fruits (n= 100) and seeds (n= 100) of each specie. The different treatments were mechanic and acid scarification, temperatures (photoperiod/ nictoperiod) of 20, 30 and 35/15 °C (12/12 and 0/24) and 25 and 35 °C (12/12). P. foliolosa fruits were wider, thickener and heavier. Its seeds are longer and thicker than those of P. reticulata. Seeds of both species were not photosensitive. Acid scarification did not increase significantly the percentage of seed germination of both species, but mechanic scarification increased significantly the percentage of seed germination for P. foliolosa. The percentage of germination at 25 °C of intact seeds of P. reticulata, scarified with acid and with sandpaper was, respectively, 55%, 60% and 89%. For seeds of P. foliolosa values obtained were, respectively, 48%, 37.5% and 83%. These results indicate limitations of germination of P. foliolosa imposed by the tegument but the effect of tegument restringing the germination of intact seeds decrease with the increase of temperature.

E Silva C.W.M.,Federal University of Minas Gerais | Branco J.R.T.,Fundacao Centro Tecnologico Of Minas Gerais | Cavaleiro A.,University of Coimbra
International Journal of Surface Science and Engineering | Year: 2011

The frictional behaviour of diamond-like carbon (DLC) coatings depends on either their chemical composition or the humidity ratio in the testing environment. In this research, C-based amorphous coatings where deposited with W addition of ~10% in reactive and non-reactive atmosphere, in an unbalanced magnetron apparatus. Reactive deposited coatings have approximately 29% H. Both coatings have hardness of 12 GPa and the scratch test critical load values were higher than 60 N. The coatings were tribological tested on a pin-on-disk machine under standard conditions and different relative humidity (RH %) of 30%, 50% and 80%. Both coatings showed the same frictional trend, i.e., friction coefficient increased with RH % value but, globally, H-containing films have lower friction than non-hydrogenated ones ([0.01-0.05] and [0.05-0.20]), respectively. Raman analysis of the worn tracks showed, in both cases, an increase of the G/D ratio of the two main characteristic peaks (G and D) of sputtered C-based coatings. Copyright © 2011 Inderscience Enterprises Ltd.

Simoes M.S.,Bolsista de Iniciacao Cientifica FAPEMIG CETEC | de Castro A.L.R.,Fundacao Centro Tecnologico Of Minas Gerais | Andrade M.S.,Fundacao Centro Tecnologico Of Minas Gerais
Revista Escola de Minas | Year: 2010

The influence of the different types and amounts of strain induced martensite in AISI 304 austenitc steel with copper in internal friction behavior was studied. Specimens were deformed by tension from 0.03 to 0.12 of true strain at temperatures in the range-50 to 20°C, in order to obtain different volumetric fractions of ε (HCP) and α' (BCC) strain induced martensites. Magnetic measurements and dilatometry were conducted to assess the quantities of induced martensite. It was found that α' increases with deformation at constant temperature, and decreases as the temperature increases at constant deformation. Internal friction tests were performed in an inverted torsion pendulum in temperatures in the range of 40 to 400°C. The occurrence of an internal friction peak around 100°C was well established and related to the ε martensite reversion. The presence of other two peaks around 220 and 350°C was associated to the α' present in the sample.

Ventura C.P.,Federal University of Minas Gerais | De Viana I.M.O.,Federal University of Minas Gerais | Ferreira E.A.E.,Fundacao Centro Tecnologico Of Minas Gerais | De Freitas R.P.,Federal University of Minas Gerais | Alves R.B.,Federal University of Minas Gerais
Letters in Organic Chemistry | Year: 2010

Herein we describe a method for the fast cycloaddition reaction of 2H-chromenes with 2-methoxy-1,4-benzoquinones by microwave heating. Using this methodology we have synthesised seven pterocarpans derivatives, five of which are novel compounds. Microwave heating allows significant yield enhancements and reduction of reaction time when compared to traditional methodology. © 2010 Bentham Science Publishers Ltd.

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