Atmospheric Chemistry
Mostrando 25-36 de 52 artigos, teses e dissertações.
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25. O uso de satélites ambientais para a estimativa dos fluxos de gases traços e de aerossóis liberados na queima de biomassa e sua assimilação em modelos numéricos de qualidade do ar / THE USE ENVIRONMENTAL SATELLITES TO ESTEEM THE TRACES GASES AND AEROSOLS FROM BIOMASS BURNING AND ASSIMILATION IN AIR QUALITY NUMERIC MODELS
O presente trabalho tem como objetivo principal empregar a energia radiativa do fogo (ERF) para calcular as emissões de material particulado com diâmetro menor que 2,5µm e monóxido de carbono para o período de queimadas na América do Sul. Realizaram-se 16 experimentos de combustão de pequena escala próximos ao laboratório de radiometria (LARAD) do I
Publicado em: 2008
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26. Myoglobins: the link between discoloration and lipid oxidation in muscle and meat
Aerobic metabolism changes rapidly to glycolysis post-mortem resulting in a pH-decrease during the transformation of muscle in to meat affecting ligand binding and redox potential of the heme iron in myoglobin, the meat pigment. The "inorganic chemistry" of meat involves (i) redox-cycling between iron(II), iron(III), and iron(IV)/protein radicals; (ii) ligan
Química Nova. Publicado em: 2006-12
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27. Monitoramento atmosférico passivo de SO2, NO2 e O3 em áreas urbanas e de influência industrial como prática de química ambiental para alunos de graduação
This study is a result of undergraduate student participation in the Environmental Chemistry discipline provided by the Chemistry Institute/UFBA. The students were involved in the development of passive samplers, a project of the LAQUAM (Environmental Analytical Chemistry Laboratory). The students' residences and other neighborhoods were used to create a pas
Química Nova. Publicado em: 2006-07
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28. SUSCEPTIBILIDADE DOS ECOSSISTEMAS CONTINENTAIS DA BAIXADA MARANHENSE AOS EFLUENTES ATMOSFÉRICOS LIBERADOS POR SÃO LUÍS MA: ESTUDOS DE CASO DE PINHEIRO E VIANA / SUSCEPTIBILITY OF CONTINENTAL ECOSYSTEMS DONTOWN AT THE ATMOSPHERIC EFFLUENTS RELEASED BY SÃO LUIS: case studies Pinheiro and Viana
In Maranhao, studies on the atmospheric chemistry are scarce, with only one record for the region of Lagoa do Caco, in First Cross. Although still a developing city, with moderate urban growth and incipient industrialization rate, the implantation of the steel complex in St. Louis - as the Aluminum Industry of Maranhão (ALUMAR) and the pellet plant and prod
Publicado em: 2006
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29. "Modelagem numérica dos processos de remoção úmida de poluentes atmosféricos: estudo de caso para a região amazônica (Rondônia)" / In-cloud and below-cloud numerical simulations of scavenging processes at Amazon Basin during LBA-SMOCC
The scavenging processes of chemical species have been studied using numerical modeling in order to understand the gases and particulate matter intra-reservoir transferences (natural or anthropogenic) which affect weather and climate. In this study RAMS model was used in turn to simulate cloud vertical structure formed over Amazonian area working together to
Publicado em: 2006
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30. Nitro- e oxi-HPA no material particulado atmosférico: algumas contribuições para uma abordagem integrada / Nitro- and oxy-PAH in the atmospheric particulate matter: some contributions for an integrated approach
Os derivados nitrados e oxigenados de hidrocarbonetos policíclicos aromáticos, nitro-HPA e oxi-HPA, podem ser encontrados no material particulado atmosférico e são provenientes da queima de combustíveis fósseis e biomassa, ou de reações dos HPA com gases atmosféricos. Determinados nitro-HPA e oxi-HPA apresentam mutagenicidade mais elevada do que a d
Publicado em: 2006
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31. GREENHOUSE GASES STUDY IN AMAZONIA / "Estudos de gases de efeito estufa na Amazônia"
The Amazon plays an important role on the global carbon cycle, as changing as carbon storage, since Amazon Basin is the biggest area of tropical forest, around 50% of global. Naturals process, deforestation, and use land are CO2 sources. The Amazon forest is a significant source of N2O by soil process, and CH4 by anaerobic process like flooded areas, rice
Publicado em: 2006
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32. Study abaout the determination of benzene and ammonia in air using quartz piezoeletric sensor. / Estudo sobre a determinação de benzeno e amônia no ar, utlizando sensor piezelétrico de quartzo
The objective of this work was to study, develop and evaluate coatings for detecting benzene and ammonia in atmospheric air, by using a piezoelectric quartz sensor. Nowadays, piezoelectric quartz sensors are very important in Analytical Chemistry due to their numerous aplications (in gaseous fase or in solution). This method is based on the fact that the qua
Publicado em: 2005
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33. Propriedades espectrais das plantas no infravermelho termal (2,5 - 14 um): da química ao dossel. / Spectral properties of plants in the thermal infrared (2.5 - 14 um): from the chemistry to the canopy.
This work explores the thermal infrared spectral properties of plants to evaluate how such data might be used in laboratory, field, and remote sensing studies of ecosystems, and to analyze diverse chemical aspects of plant species. Attenuated total reflectance (ATR) spectra of plant leaves display absorption bands caused by the fundamental molecular vibratio
Publicado em: 2005
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34. Influence of vegetation cover on nutrient cycling in soil solution at the area of Manaus AM. / Influência da cobertura vegetal na ciclagem de nutrientes via solução do solo na região de Manaus - AM.
The main objective of this study was to contribute for the sustainability of land use in the central Amazon, evaluating the influence of vegetation cover on nutrient concentrations in soil solution that is, on the amounts of cations, anions and dissolved organic carbon (DOC). Using a primary forest as reference, we compared these concentrations with those in
Publicado em: 2005
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35. O método das trajectórias clássicas: colisões coplanares do tipo A+BC
The general methodology of classical trajectories as applied to elementary chemical reactions of the A+BC type is presented. The goal is to elucidate students about the main theoretical features and potentialities in applying this versatile method to calculate the dynamical properties of reactive systems. Only the methodology for two-dimensional (2D) case is
Química Nova. Publicado em: 2003-10
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36. Química atmosférica do enxofre (IV): emissões, reações em fase aquosa e impacto ambiental
The oxidation process of sulfur(IV) species by oxygen, ozone and nitrogen oxides, catalysed by trace metal ions, can play an important role in atmospheric chemistry processes like acid rain, visibility degradation and health hazard. An overview of the more relevant investigations on emissions sources, aqueous phase conversion process and environmental impact
Química Nova. Publicado em: 2002-05