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

Análise morfométrica de frutos e sementes de Annona crassiflora Mart. (annonaceae) do Brasil Central

Com a existente redução da cobertura vegetal do Cerrado, diversas espécies arbóreas têm suas áreas de ocorrência diminuídas e como consequência perdem parte de sua diversidade genética. Para contrapor este cenário faz-se necessário conhecer a diversidade genética afim de embasar projetos e medidas práticas de conservação. Assim, este trabalho teve como objetivo investigar a variabilidade genética populacional de Annona crassiflora por meio de dados morfométricos de frutos e sementes em quatro populações no Brasil central. No total foram obtidos 152 frutos de 73 matrizes dos quais foram medidos a altura, diâmetro, massa do fruto, massa de 100 sementes e número de sementes por fruto. Os frutos foram despolpados e as semente retiradas para se medir a altura, largura e espessura. O estudo de cluster hierárquico mostrou o agrupamento de 11 pequenos grupos e dois grandes grupos, sendo que nestes dois grandes grupos há representantes das quatro populações amostradas. Isso mostra que não há uma divisão específica das populações, indicando alta variabilidade genética. Os frutos da população de Buritis foram, via de regra, significativamente maiores que das outras populações o que pode evidenciar distanciamento genético ou diferentes condições ambientais de polinização. Este padrão não foi observado nas analise das dimensões das sementes, embora tenha havido diferença estatística entre as populações. De forma geral as maiores dimensões foram encontradas nas populações de Planaltina e Buritis. Diante disso as análises indicam alta diversidade genética e frutos/sementes com dimensões maiores nos locais com melhor estado de conservação.With the existing reduction of the vegetation cover of the Cerrado, several tree species have their areas of occurrence diminished, and as a consequence, they lose part of their genetic diversity. To counter this scenario it is necessary to know the genetic diversity in order to base projects and practical conservation measures. Thus, the objective of this work was to investigate the genetic variability of Annona crassiflora by means of morphometric data of fruits and seeds in four populations in central Brazil. In total, 152 fruits were obtained from 73 matrices, of which the height, diameter, fruit mass, mass of 100 seeds and number of seeds per fruit were measured. The fruits were stripped and the seed removed to measure their height, width and thickness. The hierarchical cluster study showed the grouping of 11 small groups and two large groups, and in these two large groups there are representatives of the four populations sampled. This shows that there is no specific division of populations, indicating high genetic variability. The fruits of the Buritis population were, as a rule, significantly larger than those of other populations, which may indicate genetic distancing or different environmental conditions of pollination and dispersion. This pattern was not observed in the seed size analysis, although there was a statistical difference between the populations. In general, the largest dimensions were found in the populations of Planaltina and Buritis. Therefore, the analyzes indicate high genetic diversity and fruits/seeds with larger dimensions in the best-preserved state

Editorial, v. 24, n. 1, jan./abr. 2020: o silêncio – ou apatia – da universidade, a crise e a erosão da razão democrática

A tradição política e cultural da sociedade brasileira parece ter se voltado para suas raízes mais perversas por meio dos movimentos civilizatórios que, de tempos em tempos, nos impõe uma nova que qualifica e melhora, em tese, nossas relações pessoais e sociais. É intrigante pensar sobre porque isso está acontecendo, pois, ao mesmo tempo que estamos envolvidos em uma “crise” conjuntural e, a meu ver, estrutural na sociedade em geral e, em particular, no Estado brasileiro que é onde as relações se encontram mais deterioradas do que nunca

Leadership in the context of new public management: an analysis from the perspective of public managers of Minas Gerais and Rio de Janeiro

Novas incursões orientadas à modernização do estado, centradas na adoção de modelos de gestão pública que visam enfatizar a noção de resultado, assim como de instrumentos gerenciais típicos do management, leadership e do mundo corporativo vêm caracterizando a gestão pública brasileira. Nessa perspectiva, há de se salientar iniciativas como as dos estados de Minas Gerais, por meio de seu programa de choque de gestão, e do Rio de Janeiro. Tendo por base tais movimentos e experiências, novas questões emergem e demandam ser melhor compreendidas. A partir da análise de relações entre iniciativas associadas ao movimento em torno da chamada nova administração pública e o construto liderança, este trabalho tem como propósito central investigar, a partir de levantamento empírico de dados realizado junto a ocupantes de posições chave no setor público dos governos de Minas Gerais e Rio de Janeiro, temas, questões e desafios que emergem de tais iniciativas, assim como suas implicações sobre a demanda por novos perfis de liderança e formas de seu desenvolvimento. Com o auxílio do software de tratamento qualitativo NVivo 8 foi possível agrupar os principais temas e desafios identificados em torno das relações entre nova administração pública e liderança. O estudo permitiu, também, identificar um elenco de atributos de competências requeridas ao gestor e líder do setor público.New schools of thought targeted at the modernization of the state and centered on the adoption of public management models designed to emphasize the notion of outcome as well as of managerial tools typical of management, leadership and the corporate world have characterized public management in Brazil. From this perspective, initiatives such as those of the states of Minas Gerais and Rio de Janeiro, with their modernization of state programs should be pointed out. Based on such experiences and movements, new issues emerge and demand to be better understood. From the analysis of the relations between initiatives associated to the movement around the so-called new public management and the category leadership, this study's main goal is to investigate, using empirical data collection conducted with occupants of key positions in the public sector of both Minas Gerais and Rio de Janeiro's governments, themes, issues and challenges that emerge from such initiatives, as well as their implications on the demand for new kinds of leadership and ways of its development. With the help of the qualitative data research software NVivo 8, it was possible to group the main issues and challenges identified around the relations between public administration and new leadership. The study also allowed us to identify a list of competency attributes required of the manager and leader of the public sector

A Procedure to Calibrate a Multi-Modular Telescope

A procedure has been developed for the charge, mass and energy calibration of ions produced in nuclear heavy ion reactions. The charge and mass identification are based on a $\Delta$E-E technique. A computer code determines the conversion from ADC channels into energy values, atomic number and mass of the detected fragments by comparing with energy loss calculations through a minimization routine. The procedure does not need prior measurements with beams of known energy and charge. An application of this technique to the calibration of the MULTICS apparatus is described.Comment: 9 pages, Tex file, 3 postscript figures available upon request from [email protected]; to appear in Nucl. Inst. Met

Potential for high toxicity of polystyrene nanoplastics to the European Daphnia longispina

Background Current regulatory discussions about microplastics are often questioned based on a lack of data indicating high ecotoxic hazards of these particles within standard and recognized definitions. Moreover, there is scientific debate on what metrics to report the micro-nanoplastics toxicity (i.e. mass or particle counts-based exposure). We present here the high potential sensitivity of three genotypically different clones of the European Daphnia longispina species complex exposed to non-functionalized polystyrene nanobeads of 50 nm and 100 nm in diameter according to adapted OECD 202 test protocol. Results EC50s 48 h varied from 0.2 to 8.9 mg L−1 (mean 2.49 mg L−1) for 50 nm beads, and from 32.7 to 90.3 mg L−1 (mean 59.39 mg L−1) for the 100 nm. EC10s 48 h varied from 0.0007 to 7.5 mg L−1 (mean 0.28 mg L−1) for 50 nm beads, and from 25.5 to 69.1 mg L−1 (mean 47.51 mg L−1) for the 100 nm. Inter-clonal variability was about tenfold. Therefore, several 1000 s-fold variations in mass-based ecotoxicity for these polystyrene beads was observed if particle size and Daphnia genotype are considered jointly. Conclusions Such ecotoxicity potential is comparable to highly toxic chemicals in global and EU-based regulatory classification and labelling. Ecotoxicity based on particle counts suggested convergence of EC50s, with effects generally observed around 1011 to1015 particles L−1. The present results highlight the potential high hazard of these particles and the relevance of particle size and exposure metrics on hazard conclusion

Exploration of Compiler Optimization Sequences Using a Hybrid Approach

Finding a program-specific compiler optimization sequence is a challenge, due to the large number of optimizations provided by optimizing compilers. As a result, researchers have proposed design-space exploration schemes. This paper also presents a design-space exploration scheme, which aims to search for a compiler optimization sequence. Our hybrid approach relies on sequences previously generated for a set of training programs, with the purpose of finding optimizations and their order of application. In the first step, a clustering algorithm chooses optimizations, and in the second step, a metaheuristic algorithm discovers the sequence, in which the compiler will apply each optimization. We evaluate our approach using the LLVM compiler, and an I7 processor, respectively. The results show that we can find optimization sequences that result in target codes that, when executed on the I7 processor, outperform the standard optimization level O3, by an average improvement of 8.01 % and 6.07 %, on Polybench and cBench benchmark suites, respectively. In addition, our approach outperforms the method proposed by Purini and Jain, Best10, by an average improvement of 24.22 % and 38.81 %, considering the two benchmarks suites

Estimating Self-Sustainability in Peer-to-Peer Swarming Systems

Peer-to-peer swarming is one of the \emph{de facto} solutions for distributed content dissemination in today's Internet. By leveraging resources provided by clients, swarming systems reduce the load on and costs to publishers. However, there is a limit to how much cost savings can be gained from swarming; for example, for unpopular content peers will always depend on the publisher in order to complete their downloads. In this paper, we investigate this dependence. For this purpose, we propose a new metric, namely \emph{swarm self-sustainability}. A swarm is referred to as self-sustaining if all its blocks are collectively held by peers; the self-sustainability of a swarm is the fraction of time in which the swarm is self-sustaining. We pose the following question: how does the self-sustainability of a swarm vary as a function of content popularity, the service capacity of the users, and the size of the file? We present a model to answer the posed question. We then propose efficient solution methods to compute self-sustainability. The accuracy of our estimates is validated against simulation. Finally, we also provide closed-form expressions for the fraction of time that a given number of blocks is collectively held by peers.Comment: 27 pages, 5 figure