Modelagem analítica e experimental da filtração em meios porosos

Deep bed filtration occurs in several industrial and environmental processes like water filtration and soil contamination. In petroleum industry, deep bed filtration occurs near to injection wells during water injection, causing injectivity reduction. It also takes place during well drilling, sand production control, produced water disposal in aquifers, etc. The particle capture in porous media can be caused by different physical mechanisms (size exclusion, electrical forces, bridging, gravity, etc). A statistical model for filtration in porous media is proposed and analytical solutions for suspended and retained particles are derived. The model, which incorporates particle retention probability, is compared with the classical deep bed filtration model allowing a physical interpretation of the filtration coefficients. Comparison of the obtained analytical solutions for the proposed model with the classical model solutions allows concluding that the larger the particle capture probability, the larger the discrepancy between the proposed and the classical models

Planejando com lean construction: diretrizes para implementação da construção enxuta em obras

Nowadays lives up in an era of tight credit caused by the global financial crisis, as occurred in the past, it is the responsibility of various sectors and segments of society find ways to reinvent itself. In this context, Lean Construction presents itself as a strong alternative production management for companies in the construction segment. Arising out of lean thinking that originated in Japan in the postwar period and has spread around the world in times of extreme scarcity with the oil crisis. In practice the Lean Construction is a philosophy that seeks to improve the process of production management, maximizing the value of the flow from the customer's perspective through the elimination of losses. And thrives in environments and cultures that consider the scarcity of resources like something natural, applying both the macroeconomic crisis as in times of prosperity. The Planning and Production Control - PCP presents itself as a fundamental building block for companies to protect themselves in the face of economic fluctuations, seeking for their survival and success in the competitive market. Motivated by the lack of discussion of the topic in the local academy, and for the identification of 93.33% of construction companies that do not make use of methodological tools for PCP in the state, this dissertation aims to study and propose the implementation of lean construction in methodology of planning projects implemented on construction sites. This characterized the management system, of the production of a construction company, pointing out the main causes of ineffectiveness related to consequent low performance of one of his ventures. In sequence, the PCP was implemented with the use of tools to serve the principles of lean construction. This being monitored through indicators that provided managers managerial view of process of actions control and production of protective mechanisms. All implementation guidelines and application of this management model, were exposed in a simplified way, practical and efficient, in order to break the resistance of new practices and old paradigms in the industry.

O comportamento eleitoral da nova classe trabalhadora no Rio Grande do Norte 2014: ideologia, avaliação de governo e voto

This thesis investigates the voting behavior of the fractions of the new working class in Rio Grande do Norte, more specifically in the cities of Natal, Mossoró and Caicó, from the presidential election of 2014. This research examined the ideology, the evaluation of government and guidance the vote of a portion of the working classes of RN voters. In Brazil, from 2003, socio-economic change has occurred perceptibly, especially in a part of the working classes who ascended socially and switched to the "C economic class." Thus, there was this period, a significant expansion of this social stratum. The expansion of the "class C" in the past decade in Brazil raised the academic debate and in the media about the emergence of a "new middle class". Neri (2008) termed the "class C" of the "new middle class" and that will be the central part of their studies. But the debate on the "new middle class" can not be simplistic to the point of considering that social mobility, the main variable income, entered this segment of the population in the middle class, because it has different specificities of the popular classes. To understand this phenomenon, the income variable was outdated, adding the importance of ownership of the means of production, control of labor power and the symbolic values in the division of social classes resulting in three fractions of the new working class: the management positions, non-heads and small fighters. In this study, using as a complement to the sociological approach (ideologies and social classes) and the performance evaluation was identified that the new working class (heads) mainly reproduced the ideological and political positioning of the middle class, resulting in the rejection of PT governments (2003-2014) and it’s social, compensatory and redistributive policies. From what has been seen, the new working class (chiefs) approaches the ideological and political behavior of the middle class that will reflect in their electoral choices and class interests. The new working class (not heads and small fighters who voted in the situation) because of its classist and ideological interests approached the Workers' Party positively evaluating the Lula-Dilma governments (2003-2014) due to the implementation of compensatory policies, and redistributive programs government turned to the popular classes. In a counterpoint, the voters of the new working class (not heads and small fighters) who voted null, reproduced the discourse of mainstream media and the middle class about the rejection of compensatory policies, redistribution and government programs of Lula-Dilma governments, and consequently they disapproved of the government Dilma and her candidacy.

Modelagem analítica e experimental da filtração em meios porosos

Deep bed filtration occurs in several industrial and environmental processes like water filtration and soil contamination. In petroleum industry, deep bed filtration occurs near to injection wells during water injection, causing injectivity reduction. It also takes place during well drilling, sand production control, produced water disposal in aquifers, etc. The particle capture in porous media can be caused by different physical mechanisms (size exclusion, electrical forces, bridging, gravity, etc). A statistical model for filtration in porous media is proposed and analytical solutions for suspended and retained particles are derived. The model, which incorporates particle retention probability, is compared with the classical deep bed filtration model allowing a physical interpretation of the filtration coefficients. Comparison of the obtained analytical solutions for the proposed model with the classical model solutions allows concluding that the larger the particle capture probability, the larger the discrepancy between the proposed and the classical models

Application of multivariable control using artificial neural networks in a debutanizer distillation column

LOPES, Jose Soares Batista et al. Application of multivariable control using artificial neural networks in a debutanizer distillation column.In: INTERNATIONAL CONGRESS OF MECHANICAL ENGINEERING - COBEM, 19, 5-9 nov. 2007, Brasilia. Anais... Brasilia, 2007

Application of multivariable control using artificial neural networks in a debutanizer distillation column

LOPES, Jose Soares Batista et al. Application of multivariable control using artificial neural networks in a debutanizer distillation column.In: INTERNATIONAL CONGRESS OF MECHANICAL ENGINEERING - COBEM, 19, 5-9 nov. 2007, Brasilia. Anais... Brasilia, 2007