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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. Source

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. Source

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. Source

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. Source

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 Sao Joao 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. Source

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