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Bravo H.J.,Federal University of Minas Gerais | Pena P.N.,Federal University of Minas Gerais | Da Cunha A.E.C.,Instituto Militar Of Engineering | Malik R.,University of Waikato | Cury J.E.R.,Federal University of Santa Catarina
Advances in the Astronautical Sciences | Year: 2014

This paper proposes a procedure to compute abstractions with the observer property (OP) for discrete event systems. The procedure is a generalisation of an algorithm proposed before by the authors, which is based on a quadratic algorithm to test whether a given projection has the observer property. The new version proposed in this paper supports systems that have cycles of non-relevant events, thus removing a restriction of the previous version. Nevertheless, it retains its cubic complexity, which means that the method is asymptotically faster than other methods proposed in the literature to solve the same problem. Copyright © 2014 IFAC. Source

Kede M.L.F.M.,Escola Nacional de Saude Publica | Mavropoulos E.,Brazilian Center for Research in Physics (CBPF) | da Rocha N.C.C.,Federal University of Rio de Janeiro | Costa A.M.,Brazilian Center for Research in Physics (CBPF) | And 4 more authors.
Surface and Coatings Technology | Year: 2012

Polymeric sponges coated with hydroxyapatite (S-HA) were used in lead and cadmium uptake experiments to study the sorption capacity for possible in situ metal remediation. S-HA metal sorption was compared with synthetic hydroxyapatite (HA) powder behavior to evaluate metal uptake efficiency. The coated sponges were produced by a two-step process consisting of monetite coating and further conversion to HA. Aqueous solutions containing nearly 1000mgL -1 of Cd 2+ and 1000mgL -1 of Pb 2+ were shaken for 24hours with 0.4g of each sample (HA and S-HA). The metal uptake experiments using polymeric sponges (S-HA) coated with HA accounted for nearly 96% of Pb 2+ removal and 65% of Cd 2+ removal after a 24-hour sorption experiment, while the hydroxyapatite (HA) powder sorbed 100% of Pb 2+ and almost 50% of Cd 2+. Scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses of polymeric sponges coated with HA after the Pb 2+ uptake experiment showed needle-like crystals on the material surface, identified by X-ray diffraction (XRD) as pyromorphite, Pb 10(PO 4) 6OH 2. An initial stage of nucleation after Cd 2+ uptake (24hours) on the S-HA sample surface was observed by SEM images and EDS analysis, indicating formation of a new phase. © 2011. Source

Radomski B.M.,Instituto Militar Of Engineering | Gonzalez W.A.,Instituto Militar Of Engineering | Fiaux S.B.,Federal University of Fluminense
BioTechnology: An Indian Journal | Year: 2011

The palm fiber, lignocellulosic material, rich in fermentable sugars have potential for use in different bioprocesses. The acid hydrolysis process is commonly employed for the fractionation of these materials for the use of biotechnology xylose contained in hemicellulosic hydrolysates. This study aimed to produce xylose fromthe residue of the biodiesel industry through hydrolysis using sulfuric acid, aiming particularly bioethanol use in bioprocesses. For optimization of acid hydrolysis, therewas an experimental design, independent variables were the acid concentration, temperature and reaction time on the response variable concentration of xylose released. The maximum concentration of xylose was obtained 49.46 * 102 kg/m3, by hydrolysis using 0.46 Msulfuric acid, at 120°C for 30 minutes. © 2011 Trade Science Inc. - INDIA. Source

Agency: Cordis | Branch: FP7 | Program: CSA | Phase: INFRA-2007-1.2.3;INFRA-2007-1.2-03 | Award Amount: 5.11M | Year: 2008

EELA-2 aims to build, on the current EELA e-Infrastructure, a high capacity, production-quality, scalable Grid Facility providing round-the-clock, worldwide access to distributed computing, storage and network resources for a wide spectrum of applications from European and Latin American scientific communities. The project will provide an empowered Grid Facility with versatile services fulfilling application requirements and ensure the long-term sustainability of the e-Infrastructure beyond the term of the project. The specific EELA-2 objectives are: - Build a Grid Facility by: Expanding the current EELA e-Infrastructure to consist of more production sites mobilising more computing nodes and more storage space, at start of the project and to further grow storage over the duration of the project; Providing, in collaboration with related projects (e.g. EGEE), the full set of Grid Services needed by all types of scientific applications; Supporting applications various types (from classical off-line data processing up to control and data acquisition of scientific instruments), selected against well defined criteria (including grid added value, suitability for Grid deployment, outreach/potential impact); - Ensure the Grid Facility sustainability: Through the already established and new contacts with policy/decision makers, collaborating with RedCLARA and NRENs and supporting the ongoing creation of e-Science Initiatives and/or National Grid initiatives (NGI). Building the support of the e-Infrastructure to provide a complete set of Global Services from a Central Operation Centre and to pave the way for the creation of Regional Operation Centres in Latin America: Attracting new applications; Making available knowledge of EELA-2 Grid Facility to all potential users, developers, and decision makers through an extensive Training and Dissemination program; Creating knowledge repositories federated with the EGEE ones.

Araujo M.P.S.,Instituto Militar Of Engineering | Campos V.B.G.,Instituto Militar Of Engineering | Bandeira R.A.M.,Instituto Militar Of Engineering
International Journal of Industrial Engineering and Management | Year: 2013

This study aims to evaluate the operation of the main actors in the Brazilian market of road freight transportation: owner operators and carrier companies. It initially presents an overview of cargo transportation in Brazil, highlighting its characteristics and freight market. Subsequently, in order to characterize the performance of owner operators and carrier companies, a survey is conducted with carriers that act in Sao Paulo - Rio de janeiro. The result of this research enabled us to identify conditions of the fleet and freight costs, besides allowing a comparison between the operation of owner operators and carrier companies. Source

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