Air Dispersion
Mostrando 1-12 de 76 artigos, teses e dissertações.
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1. Gestão de eventos QBRN e a utilização do modelo Hysplit: uma revisão integrativa de literatura
RESUMO O potencial risco de exposição das populações aos agentes Químicos, Biológicos, Radioativos e Nucleares (QBRN), seja por causas intencionais ou não, configura-se como questão de segurança nacional e demanda um constante aprimoramento do seu gerenciamento. Os modelos de dispersão atmosférica vêm ganhando destaque como ferramenta de apoio à
Saúde debate. Publicado em: 25/11/2019
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2. Highly birefringent do-octagonal photonic crystal fibers with ultra flattened zero dispersion for supercontinuum generation
Abstract Photonic crystal fiber (PCF) structures with do-octagonal geometry have been studied. These do-octagonal PCF structure have smaller circular holes arranged in rhombic fashion at its centre. Moreover, these small holes are doped with materials like butanol, ethanol, methanol and propanol. Do-octagonal PCF structures doped with methanol and air filled
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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3. Directional Coupler Based on a Photonic Quasi-Crystal Fiber with Extended Cores
Abstract In this paper, an optical coupler composed by a photonic quasi-crystal fiber (PQCF) with two cores is proposed. The structure is obtained by immersion of a quasi-periodic arrangement of air holes replicated twelve-fold in a conventional fiber optical constituted of pure silica. The cores are generated from defects caused due to absence of two air ho
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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4. Influence of Nanoxides on Diffusivity and Solubility of Hydrogen in Pd-based alloys
The hydrogen interaction in palladium alloys with addition of Ce, Zr and Y was studied. These alloys are produced by arc-melting and then cold rolled into thin foils. Heat treatment at 800ºC for 24h in air atmosphere is applied to induce internal oxidation. Hydrogen permeation tests and TDS (Thermal Desorption Spectroscopy) are carried out to evaluate hydro
Mat. Res.. Publicado em: 11/01/2018
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5. Effect of Electron Beam and Gamma Rays on Carbon Nanotube Yarn Structure
Individual carbon nanotubes (CNTs) exhibit excellent mechanical, electrical and thermal properties, leading to development of a new generation of advanced lightweight materials and spacecraft electronics substituting the electronics based on silicon. The direct assembly of CNTs into macroscopic fibers or sheets has been a way to overcome their dispersion and
Mat. Res.. Publicado em: 18/09/2017
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6. Chemical, morphological, and thermogravimetric of Terminalia catappa Linn
The objective of this study is to evaluate the chemical composition, morphology, and the thermogravimetric behavior of the pulp of Terminalia catappa, also known as tropical almond. The analytical results show, based mainly on its lipid content, that this fruit has a considerable energy value. Its fiber content contributes to enhance the functional propertie
Food Sci. Technol. Publicado em: 05/02/2016
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7. Chromatic Dispersion of an Optical Fiber Based on Photonic Quasicrystals with Twelve-Fold Symmetry and its Application as Directional Coupling
Abstract Optical fibers composed by photonic quasicrystals it is based on aperiodic structures characterized by at least two different symmetrical patterns from the base matrix. In this work, an optical fiber composed by quasi-periodic and symmetric matrix was analyzed using the finite element method in conjunction with cylindrical perfectly matched layers.
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-12
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8. VARIACIÓN DE LA ESTABILIDAD Y ALTURA DE LA CAPA DE MEZCLA EN LA CIUDAD DE PINAR DEL RÍO. SU RELACIÓN CON CONDICIONES SINÓPTICAS
The study was carried out in the city of Pinar del Rio in Cuba during the period 2006-2010, where the behavior of atmospheric stability and the mixing height was analyzed. For obtaining the category of atmospheric stability the classification according to the Monin -Obukhov length was used. The methodology for calculating the mixing height was based on the p
Rev. bras. meteorol.. Publicado em: 2015-03
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9. Design of highly birefringent holey fibers with near-zero ultra-flattened chromatic dispersion and ultralow confinement loss
We present a holey fiber (HF) with elliptical air-holes located in the center core area that ensures high birefringence, near-zero ultra-flattened chromatic dispersion and very low confinement losses in a wide wavelength range. The finite element method with perfectly matched boundary layer is used to investigate the guiding properties. It is demonstrated th
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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10. Estudio del impacto en la calidad del aire de las fuentes puntuales en la ciudad de pinar del Río
A study of the impact of stationary sources on air quality on the city of Pinar del Rio, Cuba, using the modeling system MM5-CALMET-CALPUFF was made. The dispersion of SO2, NOx, CO, PM10 and PM25 emitted from 21 sources during 15 days is simulated by the model. This period is representative of the rainy season in Cuba (Summer). The of SO4(2-) and NO3- wet de
Rev. bras. meteorol.. Publicado em: 2013-03
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11. Estudo espaço-temporal da mortalidade e morbilidade por doenças respiratórias no município de Botucatu, São Paulo / Space-time study of moratality and morbidity for respiratory diseases in teh city of Botucatu, São Paulo
An ecological study conducted between the years 2003 to 2010 with monthly data on the number of mortality and morbidity from respiratory diseases, areas for monoculture of sugar cane and spatial distribution of outbreaks of fires in Botucatu, São Paulo. Data were extracted, respectively, of databases DATASUS AND THE Institute for Space Research (INPE). The
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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12. Simulação da dispersão dos poluentes atmosféricos para aplicação em análise de impacto / Simulation of air pollutants dispersion for appliance in impact analysis
Atualmente os estudos de poluição atmosférica são divididos naqueles que simulam a dispersão dos poluentes e nos que avaliam o impacto da poluição na saúde, não sendo frequentes estudos que envolvem as duas áreas. O objetivo desta pesquisa é propor uma metodologia de união da dispersão com o impacto na saúde, utilizando ferramentas já consolid
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012