Pontifical Catholic University of Minas Gerais

Belo Horizonte, Brazil

Pontifícia Universidade Católica de Minas Gerais is a private and non-profit Brazilian Catholic university in Belo Horizonte, state of Minas Gerais. In 2006, 2010 and 2013, PUC-MG was chosen the best private university in Brazil. It is maintained by the Catholic Archdiocese of Belo Horizonte. Wikipedia.

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Monteiro Sales L.C.,Product Innovation and Engineering, L.L.C. | Sodre J.R.,Pontifical Catholic University of Minas Gerais
Applied Thermal Engineering | Year: 2012

The conventional cold start system of flexible fuel engines introduces gasoline in the intake system when the vehicle is fuelled with hydrous ethanol or with high ethanol content gasoline-ethanol blends. The system is necessary to allow for ignition of the fuel-air mixture under low temperatures due to the high ethanol evaporation temperature, in comparison with gasoline. This works presents a new cold start system for flexible fuel engines with heating of intake air and ethanol injector. The removal of the gasoline reservoir for cold start is the main benefit of the new system, and it is an awaited evolution of flexible fuel engines. The experimental results demonstrate that the new system provides hydrous ethanol-fuelled engine start in less than 2 s under temperatures as low as 0 °C. © 2012 Elsevier Ltd. All rights reserved.

Sales L.C.M.,Product Innovation and Engineering, L.L.C. | Sodre J.R.,Pontifical Catholic University of Minas Gerais
Fuel | Year: 2012

This works presents the exhaust emission levels from a flexible fuel engine with heated intake air and fuel during cold start operation. A vehicle powered by an ethanol-fuelled flexible fuel engine was used in the experiments, following the US FTP-75 test schedule. The conventional gasoline injection system for cold start assistance was removed. Heating of intake air and fuel was provided by electric resistances. The results demonstrate that intake air and fuel heating can attend cold start expectations and simultaneously reduce exhaust hydrocarbon and carbon monoxide emissions. © 2012 Elsevier Ltd. All rights reserved.

Randazzo M.L.,FIAT Automobiles S.A. Vehicle Testing Division | Sodre J.R.,Pontifical Catholic University of Minas Gerais
Fuel | Year: 2011

The effects of diesel oil-soybean biodiesel blends on a passenger vehicle exhaust pollutant emissions were investigated. Blends of diesel oil and soybean biodiesel with concentrations of 3% (B3), 5% (B5), 10% (B10) and 20% (B20) were used as fuels. Additionally, the effects of anhydrous ethanol as an additive to B20 fuel blend with concentrations of 2% (B20E2) and 5% (B20E5) were also studied. The emissions tests were carried out following the New European Driving Cycle (NEDC). The results showed that increasing biodiesel concentration in the fuel blend increases carbon dioxide (CO2) and oxides of nitrogen (NOX) emissions, while carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM) emissions are reduced. The addition of anhydrous ethanol to B20 fuel blend proved it can be a strategy to control exhaust NOX and global warming effects through the reduction of CO2 concentration. However, it may require fuel injection modifications, as it increases CO, HC and PM emissions. © 2010 Elsevier Ltd. All rights reserved.

Randazzo M.L.,FIAT Powertrain Technologies | Sodre J.R.,Pontifical Catholic University of Minas Gerais
Fuel | Year: 2011

Fuel consumption and cold start characteristics of a production vehicle fuelled with blends of N. 2 diesel oil (500 ppm sulfur content), soybean biodiesel (3%, 5%, 10%, and 20%) and hydrous ethanol (2% and 5%) were compared. A wagon-type vehicle equipped with a four-cylinder, 1.3-l, 63 kW diesel engine was tested in a cold chamber at the temperature of -5 °C for the cold start tests. Fuel consumption tests were performed following the 1975 US Federal Test Procedure (FTP-75). The results showed that the cold start time was satisfactory for all fuel blends tested, but it was longer for the blend containing 20% of soybean biodiesel (B20) in comparison with the blends with lower biodiesel concentration. The cold start time also increased with increasing with increasing ethanol content in the fuel blend. Specific fuel consumption was not affected by increasing biodiesel concentration in the blend or by the use of 2% of ethanol as an additive. However, the use of 5% of ethanol concentration in the B20 blend resulted in increased specific fuel consumption. © 2011 Elsevier Ltd. All rights reserved.

Avila R.N.D.A.,FIAT Automobiles S.A. | Sodre J.R.,Pontifical Catholic University of Minas Gerais
Industrial Crops and Products | Year: 2012

In this paper the characteristics of fodder radish, a potential biodiesel source, are investigated. Recent developments in fodder radish biodiesel production and studies on the composition of fodder chemical structure are reviewed. The physical-chemical characteristics of fodder radish crude oil and biodiesel were measured and compared with available literature data and biodiesel specifications. The measured properties were density, kinematic viscosity, carbon residue, sulfur content, acid number and iodine value. A thermogravimetric analysis to evaluate the thermal behavior of fodder radish crude oil and biodiesel is included. The results show that fodder radish biodiesel can meet physical-chemical property specifications, although its acid number requires attention. © 2012 Elsevier B.V.

Manzo B.F.,Pontifical Catholic University of Minas Gerais
Revista brasileira de enfermagem | Year: 2013

The research objective was to examine the perspective of professionals, the major communication barriers experienced during the Accreditation process in a medium sized private hospital in Belo Horizonte. This is a qualitative study involving 34 health professionals from different categories. The survey results showed that the shortage of information, lack of objectivity, integrity and explicitness in the transfer of knowledge favors the rupture of the provision of quality services. The organizational communication is an effective tool to support major changes in companies, as it is the scope of hospital accreditation. Articulating the change in a concise manner, with focus on the communication, can be achieved the quality standard.

Costa R.C.,Pontifical Catholic University of Minas Gerais | Sodre J.R.,Pontifical Catholic University of Minas Gerais
Applied Thermal Engineering | Year: 2011

This work investigates the influence of compression ratio on the performance of a spark ignition engine fuelled by a blend of 78% gasoline-22% ethanol (E22) or hydrous ethanol (E100). A 1.0-L, eight-valve, four-cylinder, production engine was tested in a dynamometer bench varying the speed in the range from 1500 to 6500 rev/min. Three compression ratios were investigated: 10:1, 11:1 and 12:1. The performance parameters evaluated were torque, brake mean effective pressure (BMEP), power, specific fuel consumption (SFC), thermal efficiency, exhaust gas temperature and volumetric efficiency. The results showed that higher compression ratios improved engine performance for both fuels throughout all the speed range investigated, with major effects being observed when hydrous ethanol was used. © 2010 Elsevier Ltd. All rights reserved.

The campos rupestres and the campos de altitude from eastern Brazil occur in the mountaintops of the Espinhaço Range, Serra da Mantiqueira and Serra do Mar. Since there is some confusion on the characterization and about geographical limits of both vegetation types, the aim of this paper is to present a review of opinions about on those open environments, with discussions on the history of their nomenclature, physiognomic aspects and biogeographical affinities. Although the campos rupestres and the campos de altitude present some physiognomic and floristic similarities, both should be considered distinct vegetation types.

Parreiras R.,Pontifical Catholic University of Minas Gerais | Ekel P.,Pontifical Catholic University of Minas Gerais | Bernardes Jr. F.,Pontifical Catholic University of Minas Gerais
Information Sciences | Year: 2012

In this paper, we propose a dynamical consensus scheme which makes use of an index of comparability and of an index of concordance to regulate the information flow in the discussion among the experts. In addition to the traditional use of a concordance index to identify the discordant expert, who can be invited to review his opinion or to explain his judgment to the other experts, here an index of comparability is utilized to identify the experts that have faced difficulties in expressing their preferences. With this information at hand, a moderator can invite the experts that are confident on their opinions to support the experts that are hesitating in the construction of the fuzzy preference relations. © 2012 Elsevier Inc. All rights reserved.

The goal of this study has been to investigate the influence of various post-deposition heat treatments on the microstructure, electrical and optical properties of In2O3:Sn (ITO) thin films deposited by electron beam evaporation. We have shown that electron beam evaporated ITO thin films deposited onto substrates kept upto 150 °C, have poor electrical properties and low optical transmission in the visible range, due to their amorphous structure. As the microstructure changes from amorphous to polycrystalline it was observed that the film resistivity decreases and it is simultaneously related to an improvement in the optical transmission. From comparisons of several annealing processes it has been observed that oxygen plays an important role in doping as well as the presence of Sn in the target material. Furthermore we have shown that high quality ITO thin films can be reproducibly prepared with optical transmission being enhanced by an annealing in air and the electrical characteristics being improved by a further annealing in a reducing atmosphere. Superior electrical and optical properties could be correlated with annealed films that exhibited a cubic bixbyte structure and large crystallite dimensions larger than 50 nm. © 2010 Elsevier Ltd.

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