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Thesis (M.S.)--Michigan State University. Civil Engineering, 2008. / Title from PDF t.p. (Proquest, viewed on Aug. 11, 2009) Includes bibliographical references (p. 78-82).

Thesis (Ph. D.)--State University of New York at Binghamton, Philosophy Department (Philosophy, Interpretation and Culture Program), 2005. / Includes bibliographical references.

Orientador: Raquel Fernandes Pupo Nogueira / Banca: Renato Sanches Freire / Banca: Antonio Carlos Silva Costa Teixeira / Banca: José Ermínio Ferreira de Moraes / Banca: Valquíria de Campos / Resumo: Avaliou-se neste trabalho a degradação oxidativa do contaminante modelo 2,4-D, um herbicida, pelo sistema Fe0/ O2. Para isto foram estudados diversos parâmetros como: concentração de Fe0, variação de pH, concentração de 2,4-D, presença de ligantes, variação de pH na presença de ligantes, efeito da concentração dos ligantes EDTA e DTPA, variação da velocidade de agitação e borbulhamento de ar, efeito do tamanho de partícula de Fe0 e da presença de ânions comumente encontrados em efluentes ou águas subterrâneas contaminadas. Os resultados obtidos mostram que a degradação de 2,4-D, na ausência de ligantes, alcança ca. de 50% para concentrações de 1 ou 2% (m/V) de Fe0 em 60 ou 150 minutos, respectivamente, sendo a velocidade de degradação inversa ao aumento da concentração de Fe0 para reações com ajuste de pH inicial em 3. Nas reações com pH ajustado ao longo de todo o período observou-se um aumneto da velocidade de reação com a diminuição do pH. A presença de EDTA e DTPA aumentou a velocidade de degradação de 2,4-D em todos os valores de pH estudados e expandiu a faixa de aplicação do sistema para pHs neutros. O aumento da concentração de EDTA resulta no aumento da velocidade de degradação de 2,4-D. A degradação de EDTA também foi observada durante a reação. A diminuição da velocidade de agitação, assim como a retirada do borbulhamento de ar do sistema, diminuem a velocidade de degradação de 2,4-D. O Fe0 microparticulado apresentou uma cinética de degradação bimodal e bem mais lenta em relação ao nanoparticulado. A presença de cloreto, sulfato, bicarbonato ou hidrogenofosfato não alterou a velocidade de degradação de 2,4-D no sistema com DTPA, entretanto o nitrato exibiu uma leve inibição do processo. Foram avaliados também a reatividade e o tempo de vida de diferentes... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The oxidative degradation of the herbicide 2,4-D promoted by Fe0/O2 system has been evaluated. Several parameters have been studied like: Fe0 and 2,4-D concentrations, pH, effect of different ligands, EDTA and DTPA concentrations, speed rate and air bubbling, Fe0 particle size and presence of anions usually found in wastewater or contaminated groundwater. The results show that, in absence of ligands, 2,4-D degradation reaches up to 50% in 150 minutes for 2% Fe0 and that the degradation rate decreased as the Fe0 concentration increased. In stabilized pH reactions the degradation rate increased as the pH decreased. The presence of EDTA or DTPA enhanced 2,4-D degradation for all pH values evaluated and enlarged the reactive zone to neutral pH. Increasing EDTA concentration resulted in an increase of 2,4-D degradation rate. EDTA degradation is also observed during the reaction. Decreasing speed rate, as well as turning the air bubbling off, resulted in lower 2,4-D degradation. The use of microparticulated Fe0 turned the 2,4-D degradation kinetics in a bimodal process besides slowing it down. Sulfate, chloride, bicarbonate and phosphate didn't change 2,4-D degradation rate, however nitrate slightly inhibited the process in presence of DTPA. The reactivity and lifetime of some commercial Fe0 nanoparticles (Nanofer 25, Nanofer 25S and Zloy) were also evaluated for TCE reduction. The TCE reduction by different materials showed that kobs has decreased in synthetic groundwater in comparison to deionized water. The stabilizing polymer shell on the surface of Nanofer 25S protected the metallic iron from water corrosion and prevented the inhibition action of anions on TCE reduction. Zloy showed the highest reduction rate for TCE and for water as well, having a very short lifetime (5 days) in deionized water. However the... (Complete abstract click electronic access below) / Doutor

The purpose of this thesis is to explore the concept of environmental security. A concept that have made way on to the international arena since the end of the Cold War, and have become of more importance since the 1990’s. The discussion regarding man-made environmental change and its possible impacts on the world is very topical; especially with the Nobel Peace Prize winners in 2007 the Intergovernmental panel on climate change (IPCC) and Al Gore.The concept of environmental security is examined through a conceptual investigating study. The reason for this type of study is due to the complexity of the concept and a hope to find a ‘best’ definition to it. A conceptual investigating study is said to help create order in an existing discussion of a social problem, hence the reason for it in this thesis. The outcome of this thesis is that it is near impossible to find a ‘best’ or one definition to the concept of environmental security and that another method to deal with the concept might have presented another result. / Syftet med denna uppsats är att undersöka konceptet environmental security. Detta koncept har gjort sin väg till ett internationellt erkännande sedan Kalla kriget, och har sedan 1990-talet blivit allt mer aktuellt. Diskussionen gällande människans inverkan på klimatförändringarna och klimathotet är ständigt aktuellt, i synnerhet med tanke på vinnarna av Nobels Freds Pris 2007, med Al Gore i spetsen.Konceptet environmental security är i denna uppsats undersökt genom en begreppsutredande studie. Anledningen till denna typ av studie är att konceptet är såpass komplext men även baserat på hoppet av att hitta en ’bästa’ möjliga definition. Begreppsutredande studier sägs kunna skapa ordning i en existerande diskussion vilket kan ses som den främsta anledningen valet av den i denna uppsats.Resultatet av studien och denna uppsats är att det är i stort sett omöjligt att etablera en bästa definition av begreppet environmental security, samt att en annan metod förmodligen hade presenterat ett annat resultat.

As the global population continues to increase at an alarming rate, the world, as a whole, now faces the issue of overpopulation. If the world’s natural resource consumption and environmental pollution/destruction continue at their current pace, then the earth will eventually no longer be able to sustain all of its inhabitants. Social change is the only way to prevent this. The world’s religious traditions possess particular motivational qualities with respect to people’s worldviews and behaviors. All of the world’s religious traditions are responding, in some way, to overpopulation. Traditions in isolation, however, do not address the complexities of the current ecological crisis. Overpopulation requires a broader approach that unites the respective responses. This thesis examines the value of responses to overpopulation from certain Buddhist intellectuals in the contemporary religion and ecology discourse concerning overpopulation while also underscoring instances of resonance between those responses and ones from modern Christian thinkers.

<p>The purpose of this thesis is to explore the concept of environmental security. A concept that have made way on to the international arena since the end of the Cold War, and have become of more importance since the 1990’s. The discussion regarding man-made environmental change and its possible impacts on the world is very topical; especially with the Nobel Peace Prize winners in 2007 the Intergovernmental panel on climate change (IPCC) and Al Gore.The concept of environmental security is examined through a conceptual investigating study. The reason for this type of study is due to the complexity of the concept and a hope to find a ‘best’ definition to it. A conceptual investigating study is said to help create order in an existing discussion of a social problem, hence the reason for it in this thesis. The outcome of this thesis is that it is near impossible to find a ‘best’ or one definition to the concept of environmental security and that another method to deal with the concept might have presented another result.</p> / <p>Syftet med denna uppsats är att undersöka konceptet environmental security. Detta koncept har gjort sin väg till ett internationellt erkännande sedan Kalla kriget, och har sedan 1990-talet blivit allt mer aktuellt. Diskussionen gällande människans inverkan på klimatförändringarna och klimathotet är ständigt aktuellt, i synnerhet med tanke på vinnarna av Nobels Freds Pris 2007, med Al Gore i spetsen.Konceptet environmental security är i denna uppsats undersökt genom en begreppsutredande studie. Anledningen till denna typ av studie är att konceptet är såpass komplext men även baserat på hoppet av att hitta en ’bästa’ möjliga definition. Begreppsutredande studier sägs kunna skapa ordning i en existerande diskussion vilket kan ses som den främsta anledningen valet av den i denna uppsats.Resultatet av studien och denna uppsats är att det är i stort sett omöjligt att etablera en bästa definition av begreppet environmental security, samt att en annan metod förmodligen hade presenterat ett annat resultat.</p>

Thesis (M. Env. St.)--University of Adelaide, Mawson Graduate Centre for Environmental Studies, 1993? / Includes bibliographical references (leaves 153-163).

Thesis (Ph. D.)--University of Massachusetts Amherst, 2009. / Includes bibliographical references (p. 149-153). Print copy also available.

Thesis (M.A.)--Carleton University, Ottawa, Ontario, 1999. / Includes bibliographical references (leaves 150-162).