Gas Flux
Mostrando 1-12 de 117 artigos, teses e dissertações.
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1. Gas permeability and compressive strength evaluation of porous Al2O3 supported membrane
Abstract The aim was to investigate the feasibility of using a device to characterize permeability in porous substrates with low gas flux. Al2O3 supports were prepared by dry pressing using 1 to 3 wt% of polyethylene glycol (PEG) as a pore-forming agent. The green body was partially sintered at 1300 ºC. CO2 gas was used to measure both the pressure loss and
Cerâmica. Publicado em: 2022
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2. Performance of the INCONEL 625 alloy weld overlay obtained by FCAW process
ABSTRACT Nickel-based weld overlays (cladding) are commonly used in oil & gas industry to extend the life of equipment under corrosive environment, as it improves the corrosion resistance without a significant increase in the manufacturing cost, when compared to a full nickel-based alloy equipment. Although there are extensive literature involving overlays a
Matéria (Rio J.). Publicado em: 20/05/2019
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3. Influence of sintering temperature on the development of alumina membrane shaped by centrifugal casting for gas separation
Abstract The development of ceramic membranes for the most diverse separation processes has gained high visibility, mainly due to their better performance in harsh environments in comparison to polymeric materials. Among the different techniques used to prepare tubular ceramic membranes, the centrifugal casting (CC) is interesting for obtaining highly homoge
Cerâmica. Publicado em: 2019-01
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4. Prediction of soil CO2 flux in sugarcane management systems using the Random Forest approach
ABSTRACT: The Random Forest algorithm is a data mining technique used for classifying attributes in order of importance to explain the variation in an attribute-target, as soil CO2 flux. This study aimed to identify prediction of soil CO2 flux variables in management systems of sugarcane through the machine-learning algorithm called Random Forest. Two differ
Sci. agric. (Piracicaba, Braz.). Publicado em: 2018-08
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5. Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry
Thick welded joints of UNS S32304 lean duplex stainless steel (LDSS) has been studied in acidified glycerin, a byproduct of biodiesel plants, using cyclic polarization technique. LDSS S32304 thick plates were welded by different processes commonly employed in the fabrication process: shielded metal arc welding, gas metal arc welding and flux cored arc weldin
Mat. Res.. Publicado em: 12/12/2016
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6. Synthesis and Microstructural Characterization of SnO2:F Thin Films Deposited by AACVD
In this work, we report the synthesis and microstructural characterization of Tin oxide thin films doped with fluorine for applications such as transparent conductive oxides. Tin oxide doped with fluorine thin films were deposited by aerosol assisted chemical vapor deposition technique onto a borosilicate glass substrate, using a precursor solution of stanni
Mat. Res.. Publicado em: 31/10/2016
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7. Gaseous Shielding Gas Additives as Flux Substitute for TIG Arc Brazing
Abstract Brazing is one of the key technologies in the field of joining of metal components. To improve the wetting of brazing material and work-piece surface, it is often required to fall back on the use of flux. The application of these substances requires accuracy and is often connected with considerable expenditure and it is, just as the removal of flux
Soldag. insp.. Publicado em: 2015-09
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8. Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects
The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertiliz
Sci. agric. (Piracicaba, Braz.). Publicado em: 2015-02
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9. SIMULATION OF INTERMITTENT FLOW IN VERTICAL PIPES USING THE TWO-FLUID MODEL WITH DIFFERENT CLOSURE PARAMETERS / SIMULAÇÃO DO REGIME INTERMITENTE EM TUBULAÇÕES VERTICAIS UTILIZANDO O MODELO DE DOIS FLUIDOS COM DIFERENTES RELAÇÕES DE FECHAMENTO
Intermittent two phase flows are characterized by a succession of liquid slugs separated by bubbles of different sizes, with varying frequency. The prediction of this type of flow is very important, since it can be found in several industrial applications. In the present work, studies of intermittent flows in vertical pipes are performed, employing the Two F
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/09/2012
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10. AnÃlise do Fluxo de Gases na Camada de Cobertura do Aterro SanitÃrio Municipal Oeste de Caucaia (ASMOC) / Analysis of gas Flow in covering layer of Municipal Landfill West of Caucaia (ASMOC)
The growing human consumption entails a greater generation of waste, which, in turn, must be properly treated and disposed. The storage of waste in landfills produces gas, which if not managed properly will affect the quality of life. The uncontrolled emissions of these gases cause multiple economic, social and environmental impacts, as due to air pollution
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/01/2012
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11. Neuro estimador para o fluxo de gases entre a superfície terrestre e a atmosfera / A neuro estimator for the flux of gases between the surface land and the atmosphere
Studies show that global warming may be irreversible in the medium or long term, and is a major cause of air pollution. However, this framework can be reversed or mitigated by estimating the amount of emissions, since the mapping of pollution sources could facilitate the work of public authorities in relation to environmental monitoring and the development o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
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12. Modelagem da radiação térmica em chamas laminares da combustão de metano em ar
This work analyses the effects of thermal radiation heat transfer on methane-air laminar diffusion flames. The analysis is based on the solution of the equations of continuity, fluid motion, species mass-fraction and enthalpy. The soot formation is accounted with a twoequation model while a chemistry mecanism with 112 reactions is used for the combustion of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011