Piso regional e o seu impacto no mercado de trabalho do Paraná : um exercício para os anos 2006/2007 /

Orientador : Maurício Vaz Lobo BittencourtDissertaçăo (mestrado) - Universidade Federal do Paraná, Setor de Cięncias Sociais Aplicadas, Programa de Pós-Graduaçăo em Desenvolvimento Econômico. Defesa: Curitiba, 2008Inclui bibliografia e anexo

Salario minimo regional e a questão da distribuição de renda

Orientador: Mauricio Vaz Lobo BittencourtMonografia(Especialização) - Universidade Federal do Paraná,Setor de Ciências Sociais Aplicadas, Curso de Especialização em Desenvolvimento EconomicoResumo: Este trabalho teve par objetivo apresentar urn estudo sobre o salário mínimo, destacando um pouco da sua história no mundo e principalmente no Brasil de 1940 a 2000, chamando a atenção para a implantação do salário mínimo regional do Paraná no ano de 2006. O trabalho apresenta urn pouco da polêmica em tomo da aprovação do SMR, e busca na teoria de Kalecki uma resposta para questão do salário mínimo como instrumento eficaz na distribuição de renda, e apresenta algumas pistas para aprofundar o debate

Bioprocess design of a PHB production plant

Premi UAB de la Fundació Autònoma Solidària (FAS) als millors Treballs de Fi de Grau sobre desenvolupament sostenible i justícia global. 3a Edició, curs 2018/2019During the last century we have created a plastic dependent lifestyle, consuming each year an increasingly quantity of it, leading to severe environmental issues. Over 270 million tons of plastic residues were generated in 2017. Plastic not only is a nondegradable material, but it also comes from petroleum, which is a non-renewable resource which reserves are shrinking day by day, so an alternative had to be proposed. There are many biological substitutes for plastic, from which polyhydroxybutyrate (PHB) has been chosen for this project due to their especially suitable properties and wide and well-developed production. PHB is a biodegradable and renewable polymer with plastic properties, commonly produced by many bacteria species under specific conditions as a carbon storage. It can be synthesized from a wide variety of substrates ranging from pure glucose to many organic residues. Using residues as substrate constitutes a necessary strategy in order to achieve a profitable bioprocess in a very competitive scenario. Cheese whey residue has been the one proposed in this project, as it is an abundant residue from dairy industry and it has become a serious environmental problem over the years for its high organic load. To summarise, this project aims at producing PHB using whey residue as substrate, thus helping with two environmental concerns while trying to make profit at the same time

Photo-Fenton oxidation of phenol with magnetite as iron source

International audienceIn this work, magnetite-catalyzed Fenton reaction was investigated under UVA irradiation for the degradation of phenol as model compound. Four kinds of magnetite were used having different particle size, surface area and FeII content. Different kinetic behaviors were observed, thereby underscoring the strong implications of surface and chemical properties of magnetite. The size and surface area of the particles seemed to be less important, while the FeII/FeIII ratio played some role. Despite the link between magnetite reactivity and its structural FeII content, light-induced reduction of FeIII to FeII was found necessary to promote the Fenton-based reactions. As surface FeII may be oxidized or otherwise unavailable, initial photoactivation may be needed to trigger the Fenton reactivity. Two major driving forces were highlighted that account for the photoactivity of magnetite at pH 3: (i) the formation of intermediates such as hydroquinone that are able to reduce FeIII to FeII, and (ii) the accumulation of dissolved Fe due to magnetite dissolution, both in dark and under irradiation. Very interestingly, the photo-Fenton degradation of phenol was also observed under neutral conditions. In this case, for two out of four samples, the degradation rates were quite near those found at pH 3, which is usually reported as the optimum pH value of the process. The magnetite ability to promote photo-Fenton reactions even under circumneutral pH conditions, the limited iron leaching and its easy magnetic separation makes magnetite a promising catalyst in wastewater treatment applications