De Araujo Cardoso R.F.,Brazilian Center for Research in Physics (CBPF) |
Cunha M.A.D.,Centro Universitario Do Leste Of Minas Gerais |
Brandao L.P.M.,Military Institute of Engineering of Rio de Janeiro
Journal of Materials Research and Technology | Year: 2013
A major concern of society nowadays is the issue of sustainable development, which includes energy conservation. In order to induce a reduction of electrical energy consumption, governments across the world have pressured the appliance makers to increase in energy efficiency of electric engines. One of the ways to improve the performance of electric engines is to use steels with lower magnetic losses. The typical electrical steels are steels with about 3.5 wt.% Si. It is well known that an increase in Si content decreases magnetic losses. The purpose of this work was to evaluate the decrease of magnetic losses after increasing the Si and Al content in electrical steels by hot dipping, using an Al-Si alloy bath followed by a thermal treatment. A reduction of eddy current losses, for 60 Hz and 400 Hz, was observed in the steel after addition of Al and Si to about 4.5 wt.% Al and 4.8 wt.% Si. © 2013 Brazilian Metallurgical, Materials and Mining Association.
Godinho M.,Centro Universitario Do Leste Of Minas Gerais |
De F. Goncalves R.,Federal University of São Carlos |
Leite E.R.,Federal University of São Carlos |
Raubach C.W.,Federal University of Pelotas |
And 4 more authors.
Journal of Materials Science | Year: 2010
The gadolinium-doped ceria nanorods (Gd0.2Ce0.8O 2-x ) were synthesized by hydrothermal treatment. It was shown that the use of microwave heating during hydrothermal treatment decreases the treatment time required to obtain gadolinium-doped ceria nanorods and that oriented attachment is the dominant mechanism responsible for anisotropic growth. It was clear that Gd0.2Ce0.8O2-x nanorods were more catalytically active than commercial CeO2 in the ethanol reforming reaction. © 2009 Springer Science+Business Media, LLC.
Biochemical and hematological characteristics of the pirarucu Arapaima gigas Schinz, 1822 (Arapaimidae) from semi-intensive culture in the Amazon [Características bioquímicas e hematológicas do pirarucu Arapaima Gigas Schinz, 1822 (Arapaimidae) de cultivo semi-intensivo na Amazônia]
Drumond G.V.F.,Centro Universitario Do Leste Of Minas Gerais |
de Almeida Caixeiro A.P.,Centro Universitario Do Leste Of Minas Gerais |
Marcon J.L.,Federal University of Amazonas |
Affonso E.G.,National Institute of Amazonian Research
Acta Amazonica | Year: 2010
The present study compared the biochemical and hematological parameters of fingerlings and juveniles Arapaima gigas (Osteoglociformes, Arapaimidae) from a semi-intensive fish farming in Manaus, Amazon State, Brazil. Fingerlings A. gigas had lower levels of total protein, triglycerides, urea and mean cell volume (MCV), but higher (p<0.05) glucose, cholesterol and hemoglobin concentration, red blood cell counts, hematocrit and cell hemoglobin concentration (MCHC) when compared to juveniles. However, there was not significant difference (p>0.05) in the total thrombocytes and total white blood cell counts between fingerlings and juveniles. Juveniles A. gigas presented lower lymphocytes number and higher monocytes, neutrophils and eosinophils number when compared to the fingerlings. In further studies, A. gigas specimens with other ages should also be compared for a better understanding of the ontogenic development in this Amazon fish, because this information besides increase the knowledge of the physiology of this species, can aid in the establishment of strategies for its adequate handling.
Pivari M.O.,Federal University of Minas Gerais |
De Oliveira V.B.,Centro Universitario Do Leste Of Minas Gerais |
Costa F.M.,National Institute of Amazonian Research |
Ferreira R.M.,Centro Universitario Belo Horizonte |
Salino A.,Federal University of Minas Gerais
Rodriguesia | Year: 2011
This paper refers to aquatic flora species composition and distribution in protected and surrounding areas located in the Rio Doce valley lakes, Minas Gerais state, the third largest Brazilian lacustrine system. Data were collected from previous works, herbaria collections and field samplings done between 2007 and 2010 in aquatic environments located within and around the Parque Estadual do Rio Doce (PERD). We recorded 184 aquatic macrophyte species in different taxonomic groups, habits and life forms. In this study we propose the creation of a new life-form category, "embalsada", applied to plants established on floating meadows. This work contributed 152 new records for the Rio Doce valley in Minas Gerais, two of which were new to the state and one undescribed species. A floristic similarity characterization between protected and surrounding areas indicated that PERD protects 74% of all aquatic macrophyte species found. However, we found that 26% of all species are unsafe because they do not occur in this conservation unit.
Barbosa S.P.,Centro Universitario Do Leste Of Minas Gerais |
Elizeu T.S.,Centro Universitario Catolico Do Leste Of Minas Gerais |
Penna C.M.M.,Federal University of Minas Gerais
Ciencia e Saude Coletiva | Year: 2013
The term access is understood from the perspective of admission or entry into the system, related to the use of the system. This research seeks to analyze access to primary health care from the perspective of professionals in family health teams of three municipalities in the State of Minas Gerais: Ipatinga, Coronel Fabriciano and Santana do Paraíso. This work is a qualitative case study into the understanding of access on the part of professionals in family health teams. Twelve health professionals from different professional categories participated in the study. The data was collected through taped and subsequently transcribed interviews and analyzed using Bardin's content analysis technique. As a result the professionals showed that they believe that it is possible to improve working conditions and consequently the supply of services. The type of care and the inherent complexity make a difference in waiting time and the ability of the system to respond thereby impacting the quality of access. Professionals in the municipalities of Coronel Fabriciano and Santana do Paraíso consider the service to be organized and decisive. However, in the municipality of Jaipur, there is high management turnover that hampers the organization of the service and the smooth operation of flows and routines.
Figueredo C.C.,Federal University of Minas Gerais |
von Ruckert G.,Centro Universitario Do Leste Of Minas Gerais |
Cupertino A.,Federal University of Minas Gerais |
Pontes M.A.,Centro Universitario Do Leste Of Minas Gerais |
And 3 more authors.
FEMS Microbiology Ecology | Year: 2014
Cylindrospermopsis raciborskii is the focus of many studies due to its toxicity and increasing blooms frequency. The comprehension of the factors that might trigger these blooms is fundamental for the maintenance of good freshwater quality. To better understand the autoecology of C. raciborskii and to identify the factors controlling its dominance, general limnological features were evaluated in Pedalinhos reservoir, Brazil. Samplings were performed monthly between 2011 and 2013. Although C. raciborskii is considered a relatively perennial species in the tropics, it presented an interesting nonunimodal variation, with biovolume varying from 0 to c. 30 mm3 L-1 in short time intervals (< 30 days). These temporal trends allowed the evaluation of the isolated effects of nonclimatic variables. Cylindrospermopsis raciborskii was connected with several variables, but nitrogen was the major determinant of its dynamics. Blooms were observed when dissolved inorganic nitrogen (DIN) was scarce (< 50 μg L-1), mainly in relation to the availability of phosphorus and total-N (DIN: total-P < 3 and DIN: total-N < 0.04). This paper contributes to establish strategies to avoid C. raciborskii blooms, suggesting that a management in P levels would be not sufficient. It is necessary to consider N availability to avoid its dominance in the reservoir. © 2013 Federation of European Microbiological Societies.
Figueredo C.C.,Federal University of Minas Gerais |
von Ruckert G.,Centro Universitario Do Leste Of Minas Gerais |
Giani A.,Federal University of Minas Gerais
Acta Botanica Brasilica | Year: 2016
Conservational studies of the threatened Atlantic Forest biome are frequently restricted to terrestrial ecosystems. We know little about the water bodies, specially considering that this biome covers the third largest system of lakes in Brazil. Some of these lakes are located inside the protected “Rio Doce State Park”, but many others are found outside this reserve. These external lakes are seldom studied, but understanding their response to human activities is essential for the conservation and the protection of the lakes inside the Park. We evaluated the effects of degradation in a lake outside the Park, which shows a constant bloom of the toxic invasive cyanobacteria Cylindrospermopsis raciborskii. Phytoplankton, climate and physico-chemical variables were assessed from 2011 to 2013 to evaluate which were the major determinants of the lake dynamics. Despite the seasonal changes, the lake was always eutrophic, and cyanobacteria, transparency and nutrients were the major indicators of water characteristics. The lake seems to be nitrogen-limited and cyanobacteria were negatively correlated withnitrogen levels, since the constantly dominant C. raciborskii is a superior competitor for N. We suggest that the monitoring of nitrogen levels is fundamental to establish management strategies to avoid harmful algae blooms in this Atlantic Forest lake. © 2016, Sociedade Botanica do Brasil. All rights reserved.
Caldeira I.C.,Centro Universitario Do Leste Of Minas Gerais |
Luizi-Ponzo A.P.,Federal University of Juiz de fora |
Esteves V.G.,Federal University of Rio de Janeiro
Plant Systematics and Evolution | Year: 2013
Spores from 19 species of the subgenus Aloma Kindb. of the moss genus Fissidens were analyzed by light and scanning electron microscopy. Aloma is the largest subgenus of Fissidentaceae and is characterized by the presence of a peristome of scariosus type. The spores of the subgenus Aloma are present in monads, size small to very small, heteropolar, plano-convex, with a proximal aperture region, and the sporoderm is formed by a perine, exine, and intine. The intine is not stratified, the exine is psilate, and the perine granulated. The ornamentation elements may occur singly or grouped on the surface of the spore. The aperture region shows irregular contours, ranging from circular to elongated, due to the weakness of the sporoderm proximal pole. The observed variations among species are related to different patterns of distribution of the sporoderm granules and nanogranules. Quantitative analysis combined with qualitative results did not allow all species of the subgenus Aloma to be distinguished. The results of this study demonstrate that the spore is a useful tool for taxonomic studies, and suggest that its characters be included in phylogenetic analyses, to assist in the reconstruction of the evolutionary history of mosses. © 2012 Springer-Verlag Wien.
De Alcantara F.L.,Aperam S.A |
Barbosa R.A.N.M.,Federal University of Minas Gerais |
Da Cunha M.A.,Centro Universitario Do Leste Of Minas Gerais
ISIJ International | Year: 2013
A fine dispersion of precipitates is a key requirement in the manufacturing process of Fe-3%Si grain oriented electrical steel. In the production of high permeability grain oriented steel precipitate particles of copper and manganese sulphides and aluminium nitride delay normal grain growth during primary recrystallization, causing preferential growth of grains with Goss orientation during secondary recrystallization. The sulphides precipitate during the hot rolling process. The aluminium nitride particles are formed during hot rolling and the hot band annealing process. In this work AlN precipitation during hot deformation of a high permeability grain oriented 3%Si steel is examined. In the study, transfer bar samples were submitted to controlled heating, compression and cooling treatments in order to simulate a reversible hot rolling finishing. The samples were analyzed using the transmission electron microscope (TEM) in order to identify the precipitates and characterize size distribution. Precipitate extraction by dissolution method and analyses by inductively coupled plasma optical emission spectrometry (ICP-OES) were used to quantify the precipitation. The results allowed to describe the precipitation kinetics by a precipitation-timeerature (PTT) diagram for AlN formation during hot rolling. © 2013 ISIJ.
Botelho R.A.,Military Institute of Engineering of Rio de Janeiro |
Diniz S.B.,Military Institute of Engineering of Rio de Janeiro |
Da Cunha M.A.,Centro Universitario Do Leste Of Minas Gerais |
Brandao L.P.,Military Institute of Engineering of Rio de Janeiro
Materials Research | Year: 2015
The effects of asymmetric and conventional deformations and annealing on the microstructure of non-grain-oriented (NGO) 3 wt% silicon steel were analyzed by X-ray diffraction, optical microscopy and magnetometry. The results suggest that pure asymmetric rolling tends to lessen magnetic losses. However, intermediate annealing resulted in lower planar anisotropy, which could be estimated from the magnetic anisotropy theory. In this work, it was shown that this theory is able to predict the J50 magnetic polarization values using crystallographic texture.