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Search Results: 1 - 10 of 409644 matches for " Renato M. Brito "
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Some Remarks on Energy Storage and Energetic Complementarity  [PDF]
Renato M. Brito
Energy and Power Engineering (EPE) , 2017, DOI: 10.4236/epe.2017.99031
Abstract: This letter to the editor presents some notes related to the technological and economic limitations of the means actually available for energy storage and highlights the role that can be played by the notion of energetic complementarity in order to make feasible alternatives for a better use of the energy resources at our disposal. The notion of complementarity may represent a major advance in the design of energy generation projects, but its application depends on a broader conception of the projects and the contexts in which they are included.
An Index Assessing the Energetic Complementarity in Time between More than Two Energy Resources  [PDF]
Elizando M. Borba, Renato M. Brito
Energy and Power Engineering (EPE) , 2017, DOI: 10.4236/epe.2017.99035
Abstract: Energy complementarity can be a tool for managers to prioritize investments in new power generation ventures. An index for complementarity assessment should allow comparison of complementarities at different sites. This article proposes a new method for the calculation of complementarity index, allowing the comparison two energy resources and also allowing the comparison of more than two energy resources. In addition, the proposed index still allows the use of hourly or daily series and not only maximum or minimum values. Finally, this article also presents a map for the state of Rio Grande do Sul, the southernmost state of Brazil, indicating the energetic complementarity in time between hydropower, wind energy and PV solar energy.
A latent shared-component generative model for real-time disease surveillance using Twitter data
Roberto C. S. N. P. Souza,Denise E. F de Brito,Renato M. Assun??o,Wagner Meira Jr
Computer Science , 2015,
Abstract: Exploiting the large amount of available data for addressing relevant social problems has been one of the key challenges in data mining. Such efforts have been recently named "data science for social good" and attracted the attention of several researchers and institutions. We give a contribution in this objective in this paper considering a difficult public health problem, the timely monitoring of dengue epidemics in small geographical areas. We develop a generative simple yet effective model to connect the fluctuations of disease cases and disease-related Twitter posts. We considered a hidden Markov process driving both, the fluctuations in dengue reported cases and the tweets issued in each region. We add a stable but random source of tweets to represent the posts when no disease cases are recorded. The model is learned through a Markov chain Monte Carlo algorithm that produces the posterior distribution of the relevant parameters. Using data from a significant number of large Brazilian towns, we demonstrate empirically that our model is able to predict well the next weeks of the disease counts using the tweets and disease cases jointly.
Comparing SLIM, SPAR-H and Bayesian Network Methodologies  [PDF]
Eduardo Calixto, Gilson Brito Alves Lima, Paulo Renato Alves Firmino
Open Journal of Safety Science and Technology (OJSST) , 2013, DOI: 10.4236/ojsst.2013.32004

Human factors always affect maintenance performance, and in some cases, it’s critical to systems availability and reliability. Despite such importance, in so many cases, there’s no human reliability method applied to analyze maintenance tasks in order to understand better human factors influence in maintenance performance. There are several human analysis methodologies and regarding human factors, SLIM (Successes Likelihood Methods), SPAR-H (Standardized Plant Analysis Risk-Human Reliability Analysis Method) and Bayesian Net take into account such factors and may be a good approach to minimize human error. In order to propose a human reliability methodology to analyze maintenance tasks taking into account human factors, a case study about turbine star up tasks will be carried out. Therefore, different human reliability methods will be performed based on specialist opinion. Finally, the human error probability as well as drawbacks and advantages from different methods will be discussed to get a final conclusion.

Supervivencia de Dendrocephalus spartaenovae (Crustacea: Anostraca: Thamnocephalidae) alimentado con un cultivo mixto de microalgas
Brito,Diagnora; Brito,Renato; Pereira,Guido;
Zootecnia Tropical , 2011,
Abstract: in the nourishment of the zooplankton several species of microalgae have been in used selected by their size, digestibility of the cellular wall and nutritional value since they influence the survival, growth and metamorphosis of crustaceans larvae. the purpose of this research was to determine the survival of dendrocephalus spartaenovae from 1 to 6 and from 6 of 32 days of age in different conditions of culturing and fed to a concentration of 5 *105 cells/ml. the survival of larvas was evaluated of d. spartaenovae from 1 to 6 days of life considering the age and population density. the survival of the organisms from 6 to 32 days of life, it measured up in relation to the age, population density and sexual condition. the survival of larvas of d. spartaenovae diminished with the age, reaching a survival of 78,33 % to 6 days of life. the minor mortality of larvas registered was for the population densities from 10 to 20 individuals/100 ml with percentages of 93,75% and 94,79%, respectively. in the anostraceos from 6 to 32 days of life; the survival diminished according to the age of individuals, the lowest rate of survival was found at 32 days with 46,53%. concerning to the population density, higher values of survival in adults population was 80,79% and 83,33% obtained in densities of 4 and 10 individuals/l, respectively. females showed higher survival rates than the males with averages of 87,5% and 72,94%, respectively.
Spontaneous acute subdural hematoma contralateral to an arachnoid cyst
Henriques, José Gilberto de Brito;Pianetti Filho, Geraldo;Henriques, Karina Santos Wandeck;Fonseca, Luiz Fernando;Melo, Renato Pacheco de;Silva, Márcia Cristina da;Malheiros, José Augusto;
Arquivos de Neuro-Psiquiatria , 2007, DOI: 10.1590/S0004-282X2007000600025
Abstract: arachnoid cysts (ac) are extra-cerebral cerebrospinal fluid collections of unknown origin. they correspond to 1% of all intracranial nontraumatic space-occupying lesions and appear more frequently in the middle fossa (50%). more than 25% of these cysts are incidental findings and the majority of patients are asymptomatic. seizures, intracranial hypertension signs, neurological deficits, macrocrania, developmental delay and bulging of the skull are the main signs and symptoms of the lesion. ac rupture and bleeding are rare, usually occurring in young adults and associated with trauma. the risk of hemorrhage does not exceed 0.04% / year. we describe the case of a ten-year-old boy who presented with acute signs of intracranial hypertension secondary to a spontaneous acute subdural hematoma, contralateral to an ac of the middle fossa. three factors were significant in this case: signs and symptoms occurred spontaneously; the presence of an acute subdural hematoma exclusively contralateral to the ac; successful outcome of the conservative treatment.
Um sistema microcontrolado para o monitoramento on-line, in situ e remoto de pH, condutividade e temperatura de águas
Lima, Renato Sousa;Santos, Vagner Bezerra dos;Guerreiro, Thiago Brito;Araújo, Mário César Ugulino de;Gai?o, Edvaldo da Nóbrega;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000100025
Abstract: a portable microcontrolled system is proposed to monitor conductivity, temperature and ph in on-line, in situ and remote way from a water reservoir faraway 200 m. the system comprises two modules: one for data reception (located in laboratory) and another for data acquisition/transmission (located near water reservoir). it uses a microcontroller and a transceiver to remote data transmission/reception by radio frequency. variations of water parameters were simultaneously monitored without interruption during a period of ten hours with a relative error about 4.0 %. the developed system showed simple, stable, accurate, robust and low-cost to determine parameters of water in field.
Caracteriza??o físico-química de complexo de inclus?o entre hidroximetilnitrofurazona e hidroxipropil-beta-ciclodextrina
Grillo, Renato;Melo, Nathalie F. S. de;Fraceto, Leonardo Fernandes;Brito, Charles L.;Trossini, Gustavo H. G.;Menezes, Carla M. S.;Ferreira, Elizabeth Igne;Moraes, Carolina Morales;
Química Nova , 2008, DOI: 10.1590/S0100-40422008000200019
Abstract: hydroxymethylnitrofurazone (nfoh) is a prodrug that is active against trypanosoma cruzi. it however presents low solubility and high toxicity. hydroxypropyl-b-cyclodextrin (hp-b-cd) can be used as a drug-delivery system for nfoh modifying its physico-chemical properties. the aim of this work is to characterize the inclusion complex between nfoh and hp-b-cd. the rate of nfoh release decreases after complexation and thermodynamic parameters from the solubility isotherm studies revealed that a stable complex is formed (dgo= 1.7 kj/mol). this study focuses on the physico-chemical characterization of a drug-delivery formulation that comes out as a potentially new therapeutic option for chagas disease treatment.
Cisto de paratireóide: aspectos diagnósticos e tratamento
Silva, Danielle A. da;Machado, Márcia C.;Brito, Lúpercio L.;Guimar?es, Renato A.;Fava, Ant?nio S.;Mamone, Maria Concei??o A.C.;
Revista Brasileira de Otorrinolaringologia , 2004, DOI: 10.1590/S0034-72992004000600024
Abstract: parathyroid cysts are rare lesions, usually located in the neck and mediastinum in about 10% of the cases, predominantly in women. the majority of the lesions are nonfunctioning; however, functioning cysts are associated with hyperparathyroidism. the diagnosis of parathyroid cyst is difficult, and frequently misdiagnosed as thyroid pathology and the final diagnosis is made during surgery confirmed by histopathological examination. a crystal clear fluid and elevated pth levels in cyst fluid confirm the diagnosis.
A inova??o no Pólo Joalheiro de Belém: uma análise a partir do mecanismo de imers?o estrutural
Castro, Renato Brito de;Baldi, Mariana;
Cadernos EBAPE.BR , 2010, DOI: 10.1590/S1679-39512010000300008
Abstract: this work is a case based on jewelry pole of belém, whose main issue is to understand how the social network influences innovation processes in this area. the main objective is to analyze how interorganizational networks impacted/impact the potential for innovation, creating both limits and opportunities for the companies' development. the adopted method analyzed the historical jewelry industry's trajectory since the beginning of mineral extraction in the city of itaituba until the present day. primary and secondary data were used to allow a view of the dynamics of the network during transformation periods of the main actors involved in the process. during the jewelry industry's trajectory a change in the quality of social relations was identified, modifying the information flow, trust and associations of various links in the production chain. both direct and indirect ties facilitated the access to remote networks entering new information concerning new products, processes and market aspects. thus, it is understood how aspects related to the position, architecture and quality of ties in a wide social network influencing the innovation process and eventual jewelry industry trajectory.
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