Sulfur Dioxide
Mostrando 13-24 de 94 artigos, teses e dissertações.
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13. Avaliação do efeito de gases poluentes na corrosão metálica: um experimento para o ensino da corrosão
In this work one proposes a didactic experience to simulate atmospheric corrosion of copper and nickel, due to sulfur dioxide presence. This is an opportunity to understand some basic aspects of atmospheric corrosion, by using fundamental concepts in chemistry, reactions of extraction and characterization of pollutants, as well as their participation in corr
Química Nova. Publicado em: 2011
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14. Avaliação experimental da absorção de SO2 e estudo preliminar da absorção de NO em torre de nebulização / Experimental evaluation of SO2 absorption and preliminary study of NO absorption into a spray tower
Este trabalho apresenta uma avaliação experimental da absorção de SO2 e um estudo preliminar da absorção de NO em uma torre de nebulização. O estudo experimental de absorção de SO2 foi realizado com solução de NaOH em diferentes condições de operação, variando a vazão de solução, vazão de gás e bicos pulverizadores de pressão. Assim, fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/06/2010
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15. Um Estudo da Qualidade do Ar na Cidade de Fortaleza. / A Study of Air Quality in the city of Fortaleza.
The quality of life for people around the world has a direct relationship with the ambient air quality, resource essential to life. Population growth in urban centers has contributed profoundly to the increased emission of pollutants into the atmosphere, mainly by burning fossil fuels and other actions of anthropogenic nature. Cities like Tokyo, Beijing, New
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/05/2010
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16. Contribution for the Brazilian database to support life cycle assessment: nitrogen fertilizers. / Contribuição ao banco de dados brasileiro para apoio à avaliação do ciclo de vida: fertilizantes nitrogenados.
The main limitation of Life Cycle Assessment (LCA) is the necessity for collection a large number of representative data for the region under study. This limitation can get rounded by the construction of regional databases, or inventories of elements that are common to the life cycle of many products. Among these elements are the chemical fertilizers. In thi
Publicado em: 2009
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17. Poluição atmosférica e efeitos adversos na gravidez em um município industrializado no estado do Rio de Janeiro / Air pollution and adverses pregnancy outcomes in an industrialized city in the state of Rio de Janeiro
BACKGROUND: Several studies have shown the association between outdoor air pollution and adverse pregnancy outcomes, related to low birth weight (LBW), preterm birth and intrauterine grow restriction (IUGR). OBJECTIVES: To investigate the association between low birth weight and preterm delivery and maternal exposure to specific outdoor air contaminants, par
Publicado em: 2009
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18. Interaction of SO2 with molecular and ionic species: Raman spectroscopy and theoretical calculations / Interação de SO2 com espécies iônicas e moleculares: espectrocopia raman e cálculos teóricos
In the present work molecular systems bearing the sulfur dioxide (SO2) as an electron acceptor species and several electron donor species as amines (aliphatic and aromatic), inorganic complexes and ionic liquids were investigated. Such complexes are commonly known as donor-acceptor complexes, and in particular, in the case of SO2 complexes are characterized
Publicado em: 2009
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19. Alternative energy sources: a study on environmental awareness, social and economic of biodiesel with teachers in a city of technology center for Natal-RN / Fonte de energia alternativa: um estudo sobre a percepção ambiental, social e econômica do biodiesel com docentes do Centro de Tecnologia do gás da cidade de Natal RN
Meaning fuel and renewal energy sources derivative additives, the term biodiesel exists in Brazil since 1980, when it was signed its first patent by Expedito Parente. Since then, its importance has grown gradually due to the worsening of the ambient problems, since its use has became a highly promising alternative to the pollution decrease, as in the carbon
Publicado em: 2009
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20. Extraction of garlic with supercritical CO2 and conventional organic solvents
Garlic (Allium sativum L.) and garlic extracts have therapeutical properties that stem from their sulfur-containing compounds, mainly allicin. The main objective of this work was to compare conventional and "premium" garlic extracts in terms of yield and quality, with the latter being obtained using supercritical carbon dioxide (SC-CO2) as the solvent. Yield
Brazilian Journal of Chemical Engineering. Publicado em: 2008-09
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21. Metabolismo do dibenzotiofeno por Cunninghamella elegans associados aos estudos morfolÃgicos e ultraestruturais
Considering the biotechnological potential of Cunninghamella elegans related to recalcitrant compounds in the environment the aim of this work was to evaluate the dibenzothiophene (DBT) degradation in association with morphological and ultrastructral aspects. Samples treated with DBT were submitted to gas chromatography coupled to mass spectrometry - GC-MS.
Publicado em: 2008
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22. Productions of ethyl esters (biodesel) from the transesterification core residual oil / Produção de esteres etilicos (biodiesel) a partir da transesterização basica de oleo residual
Biodiesel (alkyl esters) is a clean burning fuel derived from a renewable lipid feedstock such as vegetable oil or animal fat. It is biodegradable, non-inflammable, nontoxic and produce much lesser COx, sulfur dioxide and unburned hydrocarbons than petroleum-based diesel. Nowadays, due to the price of virgin oil such as soybean and canola oils, the use of lo
Publicado em: 2008
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23. Mecanismo de defesa e recuperação da fotossintese em Centrolobium tomentosum sob condições de estresse induzido por SO2 / Mechanism of defense and recovery of photosynthesis in Centrolobium tomentosum under conditions of stress induced by SO2
Large quantities of gaseous pollutants emited by urban-industrial areas emit contribute to the degradation of ecosystems with subsequent declines in vegetation. The photosynthesis is one of the first processes altered by the action of these pollutants and sulphur dioxide (SO2), as one of the most common and harmful air pollutants, drastically affect the phot
Publicado em: 2008
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24. Pseudomonas fluorescens UCP 1514 biotechnological potential in degradation of dibenzotiofenol / Potencial biotecnologico de Pseudomonas fluorescens UCP 1514 no no processo degrativo do dibenzotiofeno
Crude oil and its distillates contain significant amounts of low-molecular-mass organosulphur compounds such as alkyland cycloalkyl thiols, alkyl- and arylthioethers and aromatic heterocycles based on thiophene. This last group of polycyclic aromatic sulfurated hydrocarbons includes thiophene itself, benzothiophene, dibenzothiophene, and their alkylated deri
Publicado em: 2007