Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-01-15T21:40:48Z No. of bitstreams: 1 JuliSergineTavaresTeixeira_DISSERT.pdf: 3011743 bytes, checksum: ae7c912681646dd098ec333919f4d02b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-01-17T13:58:44Z (GMT) No. of bitstreams: 1 JuliSergineTavaresTeixeira_DISSERT.pdf: 3011743 bytes, checksum: ae7c912681646dd098ec333919f4d02b (MD5) / Made available in DSpace on 2018-01-17T13:58:44Z (GMT). No. of bitstreams: 1 JuliSergineTavaresTeixeira_DISSERT.pdf: 3011743 bytes, checksum: ae7c912681646dd098ec333919f4d02b (MD5) Previous issue date: 2017-08-14 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O sistema de bombeamento de ?gua utilizando a energia solar fotovoltaica demonstra ser uma ?rea promissora no Brasil, j? que o pa?s possui elevado potencial para produzir essa energia e devido ? escassez de ?gua enfrentada, esta seria uma ?tima oportunidade para viabilizar investimentos neste seguimento. Este sistema consiste em diversos componentes e pe?as associadas a diferentes campos da engenharia, como a el?trica, mec?nica, eletr?nica, computacional e a civil. Devido a sua interdisciplinaridade o sistema atraiu diversos pesquisadores e consequentemente contribuiu para torna-lo mais eficiente e de baixo custo para atender as necessidades de bombeamento de ?gua para o ser humano, para os animais e para as irriga??es. O presente trabalho apresenta o desempenho de uma planta??o de oleaginosa, no caso o girassol, irrigada por energia solar. O trabalho tamb?m discute a classifica??o geral do tipo de sistema, os antecedentes hist?ricos deste sistema, os v?rios esfor?os empreendidos por pesquisadores e o estado atual da investiga??o sobre o tema. S?o detalhadas informa??es referentes a bomba e a avalia??o do painel fotovoltaico (PV), que acabam afetando o desempenho e a efici?ncia do sistema. Assim como, o acompanhamento da evolu??o da germina??o das sementes de girassol e seu desenvolvimento durante os 60 primeiros dias. Para o sistema analisado n?o foi vi?vel o crescimento do girassol. / The water pumping system uses photovoltaic solar energy demonstrates a promising area in Brazil, since the country has the potential to produce this energy and due to the water shortage faced, this is a great opportunity to make investments in this follow up. This system consists of several components and parts associated with different fields of engineering, such as electrical, mechanical, electronic, computational and civil. Due to its interdisciplinarity the system has attracted several researchers and consequently contributions to make it more efficient and low cost to meet as water pumping needs for humans, animals and MRI. The present work presents the performance of an oilseed plantation, not the sunflower, irrigated by solar energy. The paper also discusses a general classification of the type of system, the historical background of this system, the various efforts undertaken by researchers and the current state of research on the subject. Pump information and photovoltaic (PV) panel evaluation are detailed, which end up affecting system performance and efficiency. As well as, the monitoring of the development of the germination of the sunflower structures and their development during the initial 60 days. For the analyzed system, sunflower growth was not feasible.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-20T23:44:11Z No. of bitstreams: 1 AnnyGabrielleDaCruzChaves_DISSERT.pdf: 1741227 bytes, checksum: 6fa35aa295516ed7c00ec3caaccad18c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-27T18:34:48Z (GMT) No. of bitstreams: 1 AnnyGabrielleDaCruzChaves_DISSERT.pdf: 1741227 bytes, checksum: 6fa35aa295516ed7c00ec3caaccad18c (MD5) / Made available in DSpace on 2017-03-27T18:34:48Z (GMT). No. of bitstreams: 1 AnnyGabrielleDaCruzChaves_DISSERT.pdf: 1741227 bytes, checksum: 6fa35aa295516ed7c00ec3caaccad18c (MD5) Previous issue date: 2016-12-12 / Este trabalho teve como objetivo diagnosticar a explora??o de lenha em ?reas com Plano de Manejo Florestal Sustent?vel (PMFS) na Caatinga do Estado do Rio Grande do Norte. A coleta dos dados foi realizada entre 2015 e 2016, por meio de entrevistas com uma amostra de propriet?rios de 30 ?reas com PMFS e aplica??o de question?rio. Cerca de 63,3% dos PMFS tinham ?rea at? 750 ha, com produtividade variando entre 83 e 263 st/ha. A maioria (70%) tinha at? tr?s anos de atividade de explora??o e o principal produto explorado foi a lenha para consumo direto. O corte da lenha estava sendo terceirizado em 83,3% das ?reas e realizado pelos propriet?rios nas demais. Grande parte dos propriet?rios (43,3%) encontrou dificuldade para contrata??o de pessoal capacitado para o corte, que foi realizado com motosserra em 66,7% das propriedades e com machado e foice em 13,3%. Em 30% das ?reas havia explora??o ilegal de lenha antes do PMFS e em 63,3% das propriedades a Reserva Legal foi demarcada por ocasi?o da elabora??o do PMFS. Para 87,7% dos propriet?rios entrevistados o manejo florestal sustent?vel foi considerado economicamente interessante. Em rela??o ?s principais dificuldades encontradas, 80% dos propriet?rios citaram a falta de fiscaliza??o da explora??o e do com?rcio de lenha clandestina e os demais citaram a demora da autoriza??o pelo ?rg?o ambiental para o in?cio das atividades de explora??o. Apesar das dificuldades, a maioria dos propriet?rios declarou que pretende continuar com o manejo florestal. / The aim of this study was to diagnostic the logging practices in areas showing a Sustainable Forest Management Plan (SFMP) from Caatinga in the State of Rio Grande do Norte, Brazil. Data were collected between 2015 and 2016, by interviews with farm owners from 30 areas that showed a SFMP and by application of a questionnaire. About 63,3% of SFMP had an area up to 750 ha, with productivity varying between 83 and 263 st/ha. The majority (70%) had up to three years of exploration activity and the main explored product was firewood for direct consumption. The wood slashing was being outsourced in 83% of the areas and accomplished by the farm owners in the others. Most of the farm owners (43,3%) found obstacles to hire trained workforce for slashing, which was performed using chainsaw in 66,7% of the properties and using axe and sickle in 13,3% of the properties. In 30% of the areas, there was an illegal exploration of firewood before the SFMP and in 63,3% of the properties the Legal Reserve was delimited by the occasion of SFMP elaboration. To 87,7% of farm owners that were interviewed, the sustainable forest management was considered economically interesting. Regarding the main obstacles found, 80% of the farm owners mentioned the lack of inspection of the exploration and the clandestine trade of firewood, and the others mentioned the delay of authorization by the environmental agency for starting the exploration activities. Despite these obstacles, most of the owners stated that they intend to keep the forest management.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-11-01T21:26:18Z No. of bitstreams: 1 IsaqueRenovatoDeAraujo_DISSERT.pdf: 831101 bytes, checksum: 9e8fc92c0ea997de47c3bf464cb71271 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-11-07T23:24:42Z (GMT) No. of bitstreams: 1 IsaqueRenovatoDeAraujo_DISSERT.pdf: 831101 bytes, checksum: 9e8fc92c0ea997de47c3bf464cb71271 (MD5) / Made available in DSpace on 2017-11-07T23:24:42Z (GMT). No. of bitstreams: 1 IsaqueRenovatoDeAraujo_DISSERT.pdf: 831101 bytes, checksum: 9e8fc92c0ea997de47c3bf464cb71271 (MD5) Previous issue date: 2017-07-31 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O presente trabalho buscou compreender e analisar de que maneira uma empresa enquadrada como agente no mercado livre de energia possui sua estrat?gia percebida por seu gestor, sendo utilizado para tal estudo as cinco for?as competitivas, relacionando-as com as estrat?gias gen?ricas para, dessa forma, compreender como o mercado ? caracterizado, juntamente com a percep??o do gestor acerca dele e as for?as de Porter no mercado de energia e?lica. Para tanto, utilizou-se de question?rio Likert listando quest?es com as cinco for?as, sendo tamb?m feitos coment?rios junto as quest?es visando preencher lacunas que pudessem vir a aparecer observadas pelo question?rio. Como resultado p?de-se compreender nuances do mercado quanto a sua dimens?o e especificidades, tanto de maneira mais abrangente como com enfoque no mercado livre de energia, quanto ao gestor foi poss?vel compreender a posi??o de sua empresa no mercado e tamb?m sua forma de atua??o no mesmo, sendo ainda poss?vel fazer an?lise a partir das cinco for?as na forma como os demais players no mercado atuam quanto e suas estrat?gias gen?ricas. A pesquisa serviu n?o somente para elucidar a forma que o mercado crescente de renov?veis est? sendo trabalhada, mas tamb?m foi satisfat?ria quanto a seu questionamento principal que visava entender como ela atuava na busca por vantagem competitiva e como ? a rela??o com as cinco for?as / The present work sought to identify and analyze how a company classified as an agent in the free energy market has its strategy perceived by its manager, being used for such study the five forces of Porter, relating them with the generic strategies, in this way Understand how the market is characterized along with the manager's perception about it and Porter's strengths in the wind power market. To do this, a Likert questionnaire has been used, listing questions with the 5 forces, and comments were also made in the questions to fill in gaps that might appear to be observed by the questionnaire.As a result, it was possible to understand market nuances as to its size and specificities, both more comprehensively and with a focus on the free energy market, as the manager was able to understand the position of his company in the market and also his way of acting in the market. Even though it is still possible to analyze the five forces in the way other players in the market act as their generic strategies. The research served not only to elucidate the way in which the growing renewable market is being worked on, but was also satisfactory in its main question that aimed to understand how it worked in the search for competitive advantage and how is the relationship with the five forces

Made available in DSpace on 2014-12-17T13:53:37Z (GMT). No. of bitstreams: 1 JoaoPCM_DISSERT.pdf: 2393754 bytes, checksum: f95d47c17e14c0db5625ca5a0ae4656d (MD5) Previous issue date: 2014-01-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Offshore wind power emits low amounts of gases, is renewable and has better performance than onshore due to its greater stability and higher wind power density, less visual and noise impact, among others. Brazil has a high capacity of generation, but has not yet developed any offshore projects. High costs are a strong impediment. This study is an effort towards pricing offshore resources through Livelized Cost of Energy - LCOE, which represents the minimum return to cover the costs of development, production and maintenance of a wind project. Initially LCOE was calculated for all Brazilian onshore wind farms listed at Bloomberg New Energy Finance R?, accounting for 71 farms. Then hypothetical offshore wind farms were created from the onshore farms, tripling the cost of generation, which is consistent with the literature, and estimating the offshore energy for two locations off the Brazilian coast using satellite data extracted from National Oceanic and Atmospheric Administration. The results demonstrate that offshore resources have the potential to significantly reduce the energy price due to the better performance of the wind at sea / A fonte de energia e?lica offshore emite baixas quantidades de gases causadores do efeito estufa, ? renov?vel e apresenta melhor desempenho do que a fonte onshore em quesitos como maior estabilidade e densidade de pot?ncia dos ventos, menor impacto visual e sonoro, dentre outros. O Brasil possui uma capacidade de gera??o offshore substancialmente elevada, mas ainda n?o desenvolveu nenhum projeto nessa modalidade. Os custos elevados s?o um forte empecilho. Esse estudo ? um esfor?o em dire??o ? explora??o desse campo, precificando a fonte offshore atrav?s do Livelized Cost of Energy LCOE, que representa o retorno m?nimo para cobrir os custos de desenvolvimento, produ??o e manuten??o de um projeto e?lico. O LCOE foi primeiramente calculado para todos os parques e?licos onshore brasileiros listados no Bloomberg New Energy Finance R?, contabilizando 71 parques. Em seguida foram criados parques e?licos offshore hipot?ticos a partir dos parques onshore, triplicando os custos de gera??o, o que est? em conformidade com a literatura especializada, e estimando-se a energia offshore para dois pontos da costa brasileira atrav?s de dados de sat?lite extra?dos do National Oceanic and Atmospheric Administration. Os resultados demonstram que a fonte offshore tem o potencial de reduzir significativamente o pre?o da energia devido ? melhor performance do vento no mar

Made available in DSpace on 2014-12-17T14:58:03Z (GMT). No. of bitstreams: 1 JoaoBSC_DISSERT_1-40.pdf: 4020421 bytes, checksum: 0d899aaf278ef09b1ceedc1d8064ebc4 (MD5) Previous issue date: 2010-08-27 / In this work a solar drying system for food dehydration was developed. It is a direct exposition drying apparatus that uses solar energy to heat the circulating air. First, the construction and assembly of this apparatus was described, in which was used scrap wraps of used tires for thermal insulation, allowing the reuse of solid waste, being an ecologically correct recycling option. After, the results obtained in experiments for cashew drying showed the thermal and economical feasibility of the proposed solar drying system, focusing on the process of flour production and in its chemical characterization. It was also demonstrated the social importance of this production for socially excluded people, since the value added to this fruit, in relation to its in nature form, may represent an option for job and income generation. The main features of the proposed dryer are its low cost and its easy fabrication and assembly process. After cashew drying, the obtained product was processed into flour by using a knife mill and it was added crushed rapadura to reduce the rancid taste caused by tannin / Apresenta-se um sistema de secagem solar para a desidrata??o de alimentos utilizando um secador de exposi??o direta que trabalha em regime de circula??o natural. Abordam-se os processos de constru??o e montagem desse secador que utiliza isolante t?rmico de raspa de pneu, permitindo a reutiliza??o de materiais, constituindo-se numa op??o ambientalmente correta de reciclagem. O trabalho apresenta resultados de testes realizados para a secagem do caju que atestam as viabilidades t?rmicas e econ?micas do sistema de secagem solar proposto enfocando o processo de produ??o da farinha e an?lises qu?micas para caracteriz?-la. Ser? tamb?m demonstrada a import?ncia social que essa produ??o representa para a popula??o mais exclu?da uma vez que o valor agregado a essa fruta, em rela??o ao in natura, pode representar uma op??o de gera??o de emprego e renda. As principais caracter?sticas do secador proposto s?o seu baixo custo e simples processo de fabrica??o e montagem. Ap?s seco o caju foi transformado em farinha por meio de um moinho de faca, e posteriormente, foi adicionada rapadura triturada para amenizar o sabor ran?oso provocado pelo tanino