Gaseous Emission
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Emissions of Nitrous Oxide and Methane in a Subtropical Ferralsol Subjected to Nitrogen Fertilization and Sheep Grazing in Integrated Crop-Livestock System
ABSTRACT Brazilian agriculture contributes significantly to nitrous oxide (N2O) and methane (CH4) emissions, so the understanding of such emissions at the field is crucial for mitigation strategies. This study quantified the impact of N application and sheep grazing on the N2O and CH4 emissions from a subtropical Ferralsol under an integrated crop-livestock
Rev. Bras. Ciênc. Solo. Publicado em: 19/06/2019
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2. Evaluación del uso de acetileno como fuente de carbono en la carburización de aceros
ABSTRACT The effect of using acetylene as a carbon source in the gas carburization of AISI/SAE 8620 steel was evaluated in this work. For this purpose, a gaseous carburizing system was designed and manufactured with the following characteristics: controlled production of a carburant gaseous atmosphere, inert and hermetic isothermal reaction zone and carbon/o
Matéria (Rio J.). Publicado em: 19/07/2018
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3. Evaluation of sample temperature and applied power on degradation of stearic acid in inductively coupled radio frequency plasma
Plasma cleaning is a promising technology in surface treatments, despite technological interest its use is limited because its mechanisms still are not entirely understood. This work aims to evaluate how the applied power of an inductively coupled RF discharge at 13,56 MHz, with Ar and Ar+10%O2 atmospheres, affects its capabilities to etch an organic molecul
Mat. Res.. Publicado em: 21/10/2014
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4. ESTUDO DA OBTENÇÃO E EMISSÕES GASOSAS DE MICROEMULSÕES COMBUSTÍVEIS DE ÓLEO DE BABAÇU / COLLECTION AND STUDY OF GAS EMISSIONS FROM FUEL BABASSU OIL MICROEMULSIONS
A utilização do óleo de babaçu in natura em motores do ciclo diesel é limitada, tendo em vista que sua alta viscosidade pode ocasionar a formação de gomas e entupimento dos bicos injetores do motor. Entretanto, a obtenção de microemulsões a partir do óleo vegetal, álcool hidratado e óleo fúsel constitui uma alternativa para redução da viscosi
Publicado em: 2010
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5. FLUXO DE GASES DE EFEITO ESTUFA EM SISTEMAS DE PREPARO DO SOLO E ROTAÇÃO DE CULTURAS NO PLANALTO DO RIO GRANDE DO SUL / GREENHOUSE GASES FLUX IN SYSTEMS OF SOIL TILLAGE AND CROP ROTATION IN THE PLANALTO REGION OF RIO GRANDE DO SUL
The main greenhouse gases (GHG) are the nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2), whose atmosphere concentrations increased in an unprecedented rate since the Industrial Revolution. This work aim evaluates the GEE emissions of spring/summer season in different soil management systems located in the Planalto region of Rio Grande do Sul Stat
Publicado em: 2009
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6. Análise multi-espectral dos eventos cíclicos de Carinae / Multi-spectral analysis of the cyclic events of Eta Carinae
In this thesis, a multi-wavelength study on the cyclic events of Eta Carinae was performed. The presence of a hole in the polar region of the Homunculus was confirmed by the velocity maps of the [Fe II] 12567 line. The blue-shifted component of the He I 10830, detected towards the NW lobe, was mapped and it is in the equatorial plane. It was observed that wi
Publicado em: 2009
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7. Avaliação da produção de odor na estação de tratamento de esgoto Paranoá e seus problemas associados
The Federal District of Brazil has been suffering problems of emanations of odors proceeding from sewage treatment plants (STP). For this reason, this work has the objective of evaluating the production of odor in the Paranoá sewage treatment plant (Paranoá STP), in Federal District, and its associated problems, employing hydrogen sulfide (H2S) as an indic
Publicado em: 2007
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8. Investigação de dioxinas, furanos, hidrocarbonetos policíclicos aromáticos no material particulado e gases emitidos por motores diesel / Investigation of dioxins, furans and polycyclic aromatic hydrocarbons in particulate material and gases emitted by diesel engines.
To investigate emission of chlorinated dioxins and furans (PCDD/Fs) and polycyclic aromatic hydrocarbons (PAHs) in heavy duty diesel engines, through the analysis of particulate material and gases in the exhaust.To verify mutagenicity of collected particulate material and gasesous sample extracts. Material and Methods: The engine emissions tests were done in
Publicado em: 2007
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9. Medições de temperaturas de chamas de etanol utilizando fluorescência induzida por laser / Temperature Measurements in Ethanol Flames Using Laser Induced Fluorescence
Conventional methods for the study of combustion are usually intrusive methods (for example, the use of thermocouples to measure flame temperatures), which might disturb the burning process (thermal, catalytic or aerodynamic effects). The diagnostics techniques using lasers, in addition to being non-intrusive, have high temporal and spatial resolution. They
Publicado em: 2005
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10. Synthesis of carbon nanostructures by using thermal plasma torch
Some recent results concerning the synthesis of carbon nanostructures in a thermal plasma generating by a plasma torch are presented. Several tests were carried out in different operational conditions. The plasma was formed with argon and different gas mixtures of argon-acetylene or argon-methane to which some catalyst materials (ferrocene and cerium oxide)
Brazilian Journal of Physics. Publicado em: 2004-12
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11. Sintese e caracterização de nanotubos e fulerenos nitrogenados gerados por arco aletrico
This thesis work aims to synthesize and to characterize structural and chemically nanotubes and fullerenes containing nitrogen. Both nanotubes and fullerenes syntheses were performed using an arc-discharge system filled with gaseous mixtures of He e N2. Electron microscopy samples analysis shows that N2 concentration inside the arc-discharge chamber influenc
Publicado em: 2004
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12. Spectroscopic study of the 24Mg35Cl and 24Mg37Cl A²pi-X²sigma+ band system
The A²pi-X²sigma+ emission band system of the MgCl molecule has been studied by means of high resolution Fourier Transform Spectroscopy (FTS). The MgCl species were produced by mixing Mg vapor with a gaseous flow of a He/Cl2 and excited in a ''heated'' Schüller's type discharge tube. Rovibrational analysis of the 0-0 and 0-1 bands was performed and the va
Brazilian Journal of Physics. Publicado em: 2003-12