Ciclos econômicos em países emergentes : um modelo DSGE para a economia brasileira

Dissertação (mestrado)- Universidade de Brasília, Programa de Pós-Graduação em Economia, 2016.O presente estudo aplica o modelo desenvolvido por Garcia-Cicco, Pancrazi e Uribe (2010) para a economia brasileira. É realizada a comparação entre os momentos estatísticos gerados pelo modelo e aqueles obtidos nos dados. O modelo aplicado à economia brasileira se mostrou capaz de refletir adequadamente a volatilidade das taxas de crescimento do produto, do consumo e do investimento, além da volatilidade e do comportamento estacionário do processo autorregressivo da razão balança comercial/produto. Por outro lado, o modelo não foi capaz de replicar adequadamente a correlação entre a taxa de crescimento do consumo com as demais variáveis.The present work applies the model developed by Garcia-Cicco, Pancrazi and Uribe (2010) to the brazilian economy. Statistical moments generated by the model are compared with those of the data. The model successfully reflects the output, consumption and investment growth rates' volatilities, in addition to the volatility and the stationary behavior of the autoregressive process of the trade balance to output ratio. On the other hand, the model was not able to successfully replicate the correlation of consumption growth rate with the other variables

Tunable Silver-containing Stationary Phases for Multidimensional Gas Chromatography

To achieve high separation power of complex samples using multidimensional gas chromatography (MDGC), the selectivity of the employed stationary phases is crucial. The non-polar × polar column combination remains the most popular column set used in MDGC. However, resolution of mixtures containing light analytes possessing very similar properties remains a formidable challenge. The development of stationary phases that offer unique separation mechanisms have the potential to significantly improve MDGC separations, particularly in resolving co-eluted peaks in complex samples. For the first time, a stationary phase containing silver(I) ions was successfully designed and employed as a second dimension column using comprehensive two dimensional gas chromatography (GC × GC) for the separation of mixtures containing alkynes, dienes, terpenes, esters, aldehydes, and ketones. Compared to a widely used non-polar and polar column set, the silver-based column exhibited superior performance by providing better chromatographic resolution of co-eluted compounds. A mixture of unsaturated fatty acids was successfully separated using a GC × GC method in which the elution order in the second dimension was highly dependent on the number of double bonds within the sample