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Search Results: 1 - 3 of 3 matches for " Filletti "
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Predicting of the Fibrous Filters Efficiency for the Removal Particles from Gas Stream by Artificial Neural Network  [PDF]
érica Regina Filletti, Juliana Maria da Silva, Valdemir Garcia Ferreira
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53033
Abstract: In this paper, artificial neural networks are used for predicting single fiber efficiency in the process of removing smaller particles from gas stream by fiber filters. For this, numerical simulations are obtained of a classic model of literature for fiber efficiency, which is numerically solved along with the convection diffusion equation in polar coordinates for particle concentration, with associated initial and boundary conditions. A sufficient number of examples from two numerical simulations are employed to construct a database, from which parameters of a novel neural model are adjusted. This model is constructed based on the back propagation algorithm in order to map two features, namely Peclet number and packing density, which are extracted from the numerical simulations into the corresponding single fiber efficiency. The results indicate that the developed neural model can be trained in a reasonable computational time and is capable of estimating single fiber efficiency from examples of the test set with a maximum error of 1.7%.
Intensidade do ruído produzido em sala de aula e análise de emiss?es acústicas em escolares
Almeida Filho, Nelson de;Filletti, Filipe;Guillaumon, Hiran Rocha;Serafini, Flavio;
Arquivos Internacionais de Otorrinolaringologia , 2012, DOI: 10.7162/S1809-48722012000100013
Abstract: introduction: noise-induced hearing loss is a sensorineural hearing loss, usually bilateral, irreversible and progressive with time of exposure. as the noise made by children in school may be considered detrimental, the study looks of their occurrence in taubaté's schools. objective: to determine if students are exposed to noise intensity affecting the cochlea, define the profile of these schoolchildren, demonstrating the occurrence of changes in cochlear activity following exposure to noise in a day of class. method: study's way prospective transversal cross sectional cut with 28 elementary school students in the first half of 2009. questionnaires for assessing preexisting cochlear damage . evaluation of cochlear function by analysis of acoustic emissions evoked distortion product, made before the students come into class and immediately after the end of these. measurement of noise inside the classrooms and recreation areas during the interval. results: 57.1% accused some hearing loss in the examinations before class. by day's end, 04 girls and 03 boys had worsened in relation of the first examination. the noise reached levels higher than recommended at the three class rooms. the largest number of students with worsening, belong to the class room with higher noise level. the noise during the intervals is also excessive. conclusions: the noise in this school is above the limit. 42.85% of students who had experienced worsening had school performance inadequate. 25% had worse after noise exposure in a school day.
Intensity of noise in the classroom and analysis of acoustic emissions in schoolchildren
Almeida Filho, Nelson de,Filletti, Filipe,Guillaumon, Hiran Rocha,Serafini, Flavio
International Archives of Otorhinolaryngology , 2012,
Abstract: Introduction: Noise-induced hearing loss is a sensorineural hearing loss, usually bilateral, irreversible and progressive with time of exposure. As the noise made by children in school may be considered detrimental, the study looks of their occurrence in Taubaté's schools. Objective: To determine if students are exposed to noise intensity affecting the cochlea, define the profile of these schoolchildren, demonstrating the occurrence of changes in cochlear activity following exposure to noise in a day of class. Method: Study's way prospective transversal cross sectional cut with 28 elementary school students in the first half of 2009. Questionnaires for assessing preexisting cochlear damage . Evaluation of cochlear function by analysis of acoustic emissions evoked distortion product, made before the students come into class and immediately after the end of these. Measurement of noise inside the classrooms and recreation areas during the interval. Results: 57.1% accused some hearing loss in the examinations before class. By day's end, 04 girls and 03 boys had worsened in relation of the first examination. The noise reached levels higher than recommended at the three class rooms. The largest number of students with worsening, belong to the class room with higher noise level. The noise during the intervals is also excessive. Conclusions: The noise in this school is above the limit. 42.85% of students who had experienced worsening had school performance inadequate. 25% had worse after noise exposure in a school day.
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