Teoria de carteiras e a alocação de parques eólicos offshore

The consumption of energy on the planet is currently based on fossil fuels. They are responsible for adverse effects on the environment. Renewables propose solutions for this scenario, but must face issues related to the capacity of the power supply. Wind energy offshore emerging as a promising alternative. The speed and stability are greater winds over oceans, but the variability of these may cause inconvenience to the generation of electric power fluctuations. To reduce this, a combination of wind farms geographically distributed was proposed. The greater the distance between them, the lower the correlation between the wind velocity, increasing the likelihood that together achieve more stable power system with less fluctuations in power generation. The efficient use of production capacity of the wind park however, depends on their distribution in marine environments. The objective of this research was to analyze the optimal allocation of wind farms offshore on the east coast of the U.S. by Modern Portfolio Theory. The Modern Portfolio Theory was used so that the process of building portfolios of wind energy offshore contemplate the particularity of intermittency of wind, through calculations of return and risk of the production of wind farms. The research was conducted with 25.934 observations of energy produced by wind farms 11 hypothetical offshore, from the installation of 01 simulated ocean turbine with a capacity of 5 MW. The data show hourly time resolution and covers the period between January 1, 1998 until December 31, 2002. Through the Matlab R software, six were calculated minimum variance portfolios, each for a period of time distinct. Given the inequality of the variability of wind over time, set up four strategies rebalancing to evaluate the performance of the related portfolios, which enabled us to identify the most beneficial to the stability of the wind energy production offshore. The results showed that the production of wind energy for 1998, 1999, 2000 and 2001 should be considered by the portfolio weights calculated for the same periods, respectively. Energy data for 2002 should use the weights derived from the portfolio calculated in the previous time period. Finally, the production of wind energy in the period 1998-2002 should also be weighted by 1/11. It follows therefore that the portfolios found failed to show reduced levels of variability when compared to the individual production of wind farms hypothetical offshore

A ética econômica das classes trabalhadoras: a gramática social do comportamento econômico da nova pequena burguesia comercial de Natal/RN

Rogram relying on sociological interface between Economic Sociology, Sociology of Moral Theory of Socialization and Social Stratification, this dissertation research makes use of theoretical contributions Luic Boltanski, Charles Taylor, Axel Honneth, Pierre Bourdieu and Bernard Lahire to problematize the generally about the physical and symbolic production and social reproduction of the type of "economic ethics" predominant in the new petite bourgeoisie Brazilian. In other words, the goal is to explain and analyze the objective conditions (economic needs and moral grammar) and intersubjective (modes of socialization and social networks) and update the social genesis and contextual transcontextual beliefs, biases, inclinations and cultural regularities observed the economic behavior of individual profiles for the fractions of the urban petty bourgeoisie and commercial upward Natal / RN. With regard to methodological strategies adopted in data collection will be conducted qualitative interviews (semistructured) and ethnographic notes. In turn, the analytical treatment of the collected empirical content is based on the approach dispositionalist (Pierre Bourdieu, Loïc Wacquant and Bernard Lahire) that emphasizes the study of the past embedded agents and the different contexts of incorporation / activation / inhibition of "provisions" individual cultural

Um estudo na teoria do movimento brownianno com viscosidade variável

In this work we investigate the stochastic behavior of a large class of systems with variable damping which are described by a time-dependent Lagrangian. Our stochastic approach is based on the Langevin treatment describing the motion of a classical Brownian particle of mass m. Two situations of physical interest are considered. In the first one, we discuss in detail an application of the standard Langevin treatment (white noise) for the variable damping system. In the second one, a more general viewpoint is adopted by assuming a given expression to the so-called collored noise. For both cases, the basic diffententiaql equations are analytically solved and al the quantities physically relevant are explicitly determined. The results depend on an arbitrary q parameter measuring how the behavior of the system departs from the standard brownian particle with constant viscosity. Several types of sthocastic behavior (superdiffusive and subdiffusive) are obteinded when the free pamameter varies continuosly. However, all the results of the conventional Langevin approach with constant damping are recovered in the limit q = 1

Comportamento e ecologia acústica da baleia jubarte (Megaptera novaeangliae) na região Nordeste do Brasil

The acoustic ecology concept involve the relation between the live organisms and their sound environment and is applied in the present work to study the context in which the humpback whale (Megaptera novaeangliae) singing behavior, known as the most complex display in the nature, occurred in the northeastern Brazilian coast, outside the core area of Abrolhos Bank, between 2005 and 2010.I analyze the singer male occurrence , their spatial distribution and probable relations with oceanographic features, such as depth, tide regimen and moon phases. I also describe the acoustic structure and temporal variation of the singing behavior, based on song frequency and time measurements outside the Abrolhos Bank, and further compare the song complexity, registered in the same period, between Abrolhos Bank (16°- 19° S, 37°- 39° W) and the adjacent North Coast, herein considered from Itacaré (14° S, 38° W) to Aracaju (11° S, 37° W). Additionally, I look for describe and analyze anthropogenic noise sources in the marine environment of the study area, produced by the oil industry as well as by the whale watching operation, relating their frequencies to the acoustic niche utilized by the humpbacks. The results indicated a great plasticity in the singing behavior, evidenced by the occurrence of singer males in diverse social structures, from solitary individuals to other groups, even containing females and calves, as well as by the diversity which compound the song, when compared between two regions inside the same breeding area, which present distinct oceanographic characteristics. The singer male distribution may be related with the continental shelf extent along the study area. The anthropogenic noise presented frequency range, amplitude and sound intensity in potential to interfere acoustically in the singing behavior of the species, may resulting in disturbance during the breeding season in the Brazilian coast. Implications about the obtained results in the humpback whale mating system are discussed. In this way, I pretend to contribute with the acoustic ecology subject and provide information to subsidize humpback whale conservation

A motivação de licenciandos em música sob a perspectiva da teoria da autodeterminação

This research had as main aim to verify the motivational quality of music students at four public universities in the Northeast of Brazil, based on the Self-Determination Theory (SDT). This perspective was proposed by Edward Deci and Richard Ryan (1985, 2000, 2008a, 2008b), and considers the qualitative aspects of motivation. It defends that the individuals have a natural tendency to self-regulation; it adopts the concept of internalizations through a continuum of self-determination conceived in the mini-theory of organismic integration. The research presents a descriptive, exploratory and correlational approach. To collect data, it was submitted a self-report questionnaire, based on the Academic Motivational Scale, translated and validated by Guimarães and Bzuneck (2008), which allow us to verify the motivation types according to a selfdeterminational continuum. According to this application, the instrument has shown evidence of satisfactory validity, with a good internal consistence and correlations from weak to moderate scale. The obtained data were collected from 380 music students, analyzed through a descriptive and inferential statistics, considering a few procedures: frequencies, averages, standard deviation, factorial analysis, internal consistence analysis through Cronbach Alpha, Pearson’s correlational analysis and variance analysis. The analyzed data show that high averages in the evaluation of self-determined motivation and low evaluation in demotivation and less autonomy motivation. Many students revealed strong intention to conclude the course. It was identified less autonomous motivation and more motivation among the students with intention to work in other areas, some of them concluded the final training process in Music Course, and say that they are in this course because they had no other option. We conclude that those graduated in Music Course, represented in this sample, show a good motivational quality. But after a few time there is a tendency in decreasing autonomous motivation because of some requirements of an academic course. In this sense, the courses must create strategies to maintain a self-determined behavior so that students can realize their autonomous motivation, identifying its importance, value and meaning along the Course.

A motivação no teatro musical sob a perspectiva da teoria da autodeterminação

Este estudo teve por objetivo geral investigar os processos motivacionais dos participantes de um grupo de Teatro Musical sob a perspectiva da Teoria da Autodeterminação - TAD (RYAN; DECI, 2004; REEVE, 2006). Os pesquisadores Edward Deci e Richard Ryan (1985, 2000, 2008a, 2008b) afirmam que todos os indivíduos possuem uma propensão inclinada à autorregulação. Por esse motivo, a TAD analisa as razões pelas quais os indivíduos podem se envolver ou evitar participar de determinadas atividades, e adota um conceito de internalização que é representada por um continuum de autodeterminação, evidenciando os diferentes tipos de motivação previstos na miniteoria da integração organísmica. Os tipos de motivação podem ser identificados de acordo com o nível de autodeterminação dos indivíduos, através da satisfação de três necessidades psicológicas básicas: a necessidade de autonomia, a necessidade de competência e a necessidade de pertencimento. Esta pesquisa tem uma abordagem qualitativa e escolheu-se o estudo de entrevistas como estratégia de investigação, utilizando a entrevista semiestruturada como principal técnica de coleta de dados. A pesquisa foi realizada com 12 participantes de um grupo de Teatro Musical de uma universidade do Estado Rio Grande do Norte, referida na pesquisa com o pseudônimo de Companhia Musicale. Os resultados apontam que a principal motivação dos alunos não era a intrínseca. Portanto, a motivação foi considerada complexa e multifacetada, pois os participantes passaram por internalização do comportamento dependendo das condições situacionais. As complexidades nas interações puderam promover a satisfação das necessidades psicológicas básicas dos integrantes que apresentaram maior internalização dos comportamentos autodeterminados. Assim, os integrantes com maior desempenho nas tarefas foram os que internalizaram a importância e o valor das atividades. O estudo busca contribuir para futuras pesquisas e colaborar no sentido de perceber a importância de investigar e promover a motivação de alunos, professores, diretores, regentes, coordenadores e participantes de grupos artísticos em geral, trazendo esclarecimentos que ressaltam as contribuições e a importância que a motivação tem sobre o ensino, a aprendizagem musical e o envolvimento de participantes de grupos artísticos em diferentes atividades.

A motivação no teatro musical sob a perspectiva da teoria da autodeterminação

Este estudo teve por objetivo geral investigar os processos motivacionais dos participantes de um grupo de Teatro Musical sob a perspectiva da Teoria da Autodeterminação - TAD (RYAN; DECI, 2004; REEVE, 2006). Os pesquisadores Edward Deci e Richard Ryan (1985, 2000, 2008a, 2008b) afirmam que todos os indivíduos possuem uma propensão inclinada à autorregulação. Por esse motivo, a TAD analisa as razões pelas quais os indivíduos podem se envolver ou evitar participar de determinadas atividades, e adota um conceito de internalização que é representada por um continuum de autodeterminação, evidenciando os diferentes tipos de motivação previstos na miniteoria da integração organísmica. Os tipos de motivação podem ser identificados de acordo com o nível de autodeterminação dos indivíduos, através da satisfação de três necessidades psicológicas básicas: a necessidade de autonomia, a necessidade de competência e a necessidade de pertencimento. Esta pesquisa tem uma abordagem qualitativa e escolheu-se o estudo de entrevistas como estratégia de investigação, utilizando a entrevista semiestruturada como principal técnica de coleta de dados. A pesquisa foi realizada com 12 participantes de um grupo de Teatro Musical de uma universidade do Estado Rio Grande do Norte, referida na pesquisa com o pseudônimo de Companhia Musicale. Os resultados apontam que a principal motivação dos alunos não era a intrínseca. Portanto, a motivação foi considerada complexa e multifacetada, pois os participantes passaram por internalização do comportamento dependendo das condições situacionais. As complexidades nas interações puderam promover a satisfação das necessidades psicológicas básicas dos integrantes que apresentaram maior internalização dos comportamentos autodeterminados. Assim, os integrantes com maior desempenho nas tarefas foram os que internalizaram a importância e o valor das atividades. O estudo busca contribuir para futuras pesquisas e colaborar no sentido de perceber a importância de investigar e promover a motivação de alunos, professores, diretores, regentes, coordenadores e participantes de grupos artísticos em geral, trazendo esclarecimentos que ressaltam as contribuições e a importância que a motivação tem sobre o ensino, a aprendizagem musical e o envolvimento de participantes de grupos artísticos em diferentes atividades.

Teoria de carteiras e a alocação de parques eólicos offshore

The consumption of energy on the planet is currently based on fossil fuels. They are responsible for adverse effects on the environment. Renewables propose solutions for this scenario, but must face issues related to the capacity of the power supply. Wind energy offshore emerging as a promising alternative. The speed and stability are greater winds over oceans, but the variability of these may cause inconvenience to the generation of electric power fluctuations. To reduce this, a combination of wind farms geographically distributed was proposed. The greater the distance between them, the lower the correlation between the wind velocity, increasing the likelihood that together achieve more stable power system with less fluctuations in power generation. The efficient use of production capacity of the wind park however, depends on their distribution in marine environments. The objective of this research was to analyze the optimal allocation of wind farms offshore on the east coast of the U.S. by Modern Portfolio Theory. The Modern Portfolio Theory was used so that the process of building portfolios of wind energy offshore contemplate the particularity of intermittency of wind, through calculations of return and risk of the production of wind farms. The research was conducted with 25.934 observations of energy produced by wind farms 11 hypothetical offshore, from the installation of 01 simulated ocean turbine with a capacity of 5 MW. The data show hourly time resolution and covers the period between January 1, 1998 until December 31, 2002. Through the Matlab R software, six were calculated minimum variance portfolios, each for a period of time distinct. Given the inequality of the variability of wind over time, set up four strategies rebalancing to evaluate the performance of the related portfolios, which enabled us to identify the most beneficial to the stability of the wind energy production offshore. The results showed that the production of wind energy for 1998, 1999, 2000 and 2001 should be considered by the portfolio weights calculated for the same periods, respectively. Energy data for 2002 should use the weights derived from the portfolio calculated in the previous time period. Finally, the production of wind energy in the period 1998-2002 should also be weighted by 1/11. It follows therefore that the portfolios found failed to show reduced levels of variability when compared to the individual production of wind farms hypothetical offshore