Polluted Environment
Mostrando 25-36 de 66 artigos, teses e dissertações.
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25. DiagnÃstico geoquÃmico e geocronologia do sistema estuarino-lagunar do roteiro Alagoas
The estuarine lagoon system of the Roteiro is located in the central coast of Alagoas, showing the largest continuous area of preserved mangroves of the State of Alagoas. This ecosystem has been heavily impacted by various anthropogenic activities such as urbanization, the cultivation of oysters, the gas production, the manufacture of cement and the cultivat
Publicado em: 2008
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26. Métodos para contenção de poluição em Redes P2P / Contention pollution methods in P2P networks
Despite currently one of the main Internet applications, P2P file sharing has been hampered by content pollution attacks. This work proposes and analyzes a class of contention methods to reduce the dissemination of polluted content whose basic principle is to limit the amount of instantaneous downloads according to its reputation. The method is firstly propo
Publicado em: 2007
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27. Mercury occorrence at the Iguaçu River Basin, State of Parana, Brasil / Ocorrencia de mercurio na Bacia do Rio Iguaçu, Estado do Parana, Brasil
Mercury contents in rocks, soil and stream sediment were determined to investigate the origin of the geochemical anomaly found in sediments of the Iguaçu River, as indicated in previous studies of a regional geochemistry survey. Except for its headwaters in the Curitiba area, with Precambrian basement rocks and Pleistocenic sediments of the Curitiba Basin,
Publicado em: 2007
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28. Avaliação de impactos ambientais nos tributários do lago Paranoá, Brasília - DF
The high level of urbanization in Distrito Federal in Brazil is contributing to modify the environment particularly the quality of surface water resources. The historical of environment aggression to the Paranoá Lake through urban expansion, land use and land occupation, is studied as environmental changes. In this work, physical-chemistry conditions and ge
Publicado em: 2007
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29. Evaluation of polluted area by total mercury at Descoberto Minas Gerais / Avaliação de área contaminada por mercúrio total em Descoberto Minas Gerais
A questão da contaminação do meio ambiente por metais pesados é um dos principais objetos de estudo das ciências que lidam com o meio ambiente físico, na atualidade. O mercúrio se destaca neste contexto, devido à sua elevada toxicidade e grande mobilidade nos ecossistemas. No Brasil, a questão da contaminação do meio ambiente pelo mercúrio é mai
Publicado em: 2006
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30. Biodegradabilidade de n-Hexadecano por bactÃrias livres e imobilizadas em quitosana
Petroleum and its derivatives are introduced in ecosystems through leaking in reservoirs or by activities related with the extration, transportation, storage, processing, manipulation and disposal. In general these compounds are harmful to the health of the organisms, being able to cause serious environmental damages. In front of this problem there is an inc
Publicado em: 2006
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31. Evaluation of the behavior of essential and non essential trace elements in contaminated soil under plants cultivation / Avaliação do comportamento de elementos traço essenciais e não essenciais em solo contaminado sob cultivo de plantas
The contamination of the soil is growing in the world. There are great expanses of soil polluted with trace elements, organic compounds, organometals and radioactive elements that appear in concentrations that can endanger the environment. The behavior of trace elements in soils and its phytoavailability with subsequent transport to the alimentary chain has
Publicado em: 2006
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32. Diagnosis of the unregulated dumping of construction and demolition residues in outlying neighborhoods of Uberlândia: subsidies for a sustainable administration / Diagnóstico da deposição clandestina de resíduos de construção e demolição em bairros periféricos de Uberlândia: subsídios para uma gestão sustentável
With the accelerated urbanization, the fast growth of the Brazilian cities and the increase of the construction activities, the poduction of Construction and Demolition Wastes - RCD reached alarming amounts. This work is a case research, which made the diagnosis of the situation of unregulated dumping of RCD in the outlying neighborhood in Uberlândia, and i
Publicado em: 2006
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33. Quantity perception and water quality in the communities on the margins of Sorocaba and Pirajibu rivers / Percepção da quantidade e qualidade da agua nas comunidades alojadas as margens dos rios Sorocaba e Pirajibu
The increase of the urban demand for ground is responsible for the sprouting of territorial invasions, slum quarters and made use human conglomerates of disordered and dense form, mainly in risk and preservation areas. The deepen of the bodies of water and its bad quality directly reflect in next living communities it, causing floods, transmission of illness
Publicado em: 2006
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34. Remediation of cadmium- and lead-contaminated soils with an aluminum industry by-product / Subproduto da indÃstria de alumÃnio na remediaÃÃo de Ãreas contaminadas com cÃdmio e chumbo
Mining activities have been increasing each day and generate large amounts of residues or by-products, which have caused a lot of interest by researchers in evaluating their potential use as soil amendments. One of the applications of such amendments is on the remediation of soils contaminated with trace elements, which might pose a threat to animals and pla
Publicado em: 2006
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35. Effects of high density chickens creation on the zootechnical yield, cage environment. / Efeitos da criação de frangos em alta densidade sobre a ambiencia do galpão, o rendimento zootecnico e a qualidade da carne.
The chicken creation in high population density has been a worldwide practice with the objective of reducing production costs. This practice causes alterations in the creation ecosystem, interfering in the well-being of the birds, increasing feces and wastes concentration that results in higher formation of irritating gases as the ammonia. These environmenta
Publicado em: 2005
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36. RemediaÃÃo de solos contaminados por derivados de petrÃleo utilizando processo foto-fenton
In the manipulation of petroleum derivatives may occur the contamination of soil, because of leaks, spills and other accidents during the exploration, refining, transport and storage. Those accidents have been increasing in the last years due to the growing demand of energy of the country. Many of these pollutants are highly impactants for man and environmen
Publicado em: 2005