• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 11
  • Tagged with
  • 12
  • 12
  • 10
  • 8
  • 5
  • 4
  • 4
  • 4
  • 3
  • 3
  • 3
  • 3
  • 3
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

A onda do turismo na cidade do sol: a reconfigura??o urbana de Natal

Furtado, Edna Maria 01 July 2005 (has links)
Made available in DSpace on 2014-12-17T14:20:15Z (GMT). No. of bitstreams: 1 EdnaMF.pdf: 7501926 bytes, checksum: ec676773cbc95092f2f78333f065b1ff (MD5) Previous issue date: 2005-07-01 / Space reading of Natal City and its reconfiguration from the intensification of tourist activity and the expansion of the services' sector, transiting, primarily, through the geography, the social sciences, the economy, in one main approach that is unaware of science's traditional limitations and recognizes the complexity that involves current world. In face of this agreement it analyzes the social-economic implications that remodel the spaces under the new economic view of services' sector, commanded by the tourism, in an intense process of city's reconfiguration, concentrating in three great axles and their irrigation ways. These changes were about the public-private relation (by the public politics) in the formation of new spaces and in the remodeling of the city's old areas, which, together, had contributed to the tourist activity's appropriation, returning it in a social-economic mosaic that owns obvious reflexes in its space. This fragmentation in the urbane cloth of Natal is expressed by social nature and economic points and, in the scenery, is manifested through the modern forms of city's space occupation by the local elites and services' sector, evidencing their status' district, as well as selecting those areas with bigger capacity to reply to the capital / Leitura espacial da cidade de Natal e sua reconfigura??o a partir da intensifica??o da atividade tur?stica e da expans?o do setor de servi?os, transitando, principalmente, pela geografia, pelas ci?ncias sociais e pela economia, em uma abordagem matricial que desconhece as limita??es tradicionais da ci?ncia e reconhece a complexidade que envolve o mundo atual. Em face desse entendimento, analisa as imbrica??es socioecon?micas que remodelam os espa?os sob a ?gide da nova economia do setor de servi?os capitaneada pelo turismo, em um intenso processo de reconfigura??o da cidade, concentrando-se em tr?s grandes eixos e suas vias irrigantes. Essas mudan?as deveram-se ? rela??o p?blico-privado (vias pol?ticas p?blicas) na forma??o de novos espa?os e na remodela??o de ?reas antigas da cidade que, no conjunto, contribu?ram para que a atividade tur?stica dela se apropriasse, tornando-a um mosaico socioecon?mico que possui reflexos evidentes no seu espa?o. Esta Fragmenta??o no tecido urbano de Natal se expressa por indicadores de natureza social e econ?mica e, paisagisticamente, se manifesta pelas formas modernas na ocupa??o do espa?o da cidade pelas elites locais e pelo setor de servi?os, evidenciando os seus bairros de status, bem como selecionando aquelas ?reas com maior capacidade de resposta ao capital
12

Determina??o de Chaveamento para Recomposi??o do Servi?o em Redes de Distribui??o de Energia El?trica em M?dia Tens?o Atrav?s de M?todos Baseado em Par?metros de Sensibilidade / Determination of switching for service restoration in distribution networks of medium voltage electricity through a method based on sensitivity parameters

Silva Junior, Jos? Luiz da 14 September 2012 (has links)
Made available in DSpace on 2014-12-17T14:55:08Z (GMT). No. of bitstreams: 1 JoseLSJ_TESE_inicio_cap3.pdf: 5087372 bytes, checksum: 32854a8694adced697dc0d05e597a98e (MD5) Previous issue date: 2012-09-14 / Companhia Energ?tica do Rio Grande do Norte / The reconfiguration of a distribution network is a change in its topology, aiming to provide specific operation conditions of the network, by changing the status of its switches. It can be performed regardless of any system anomaly. The service restoration is a particular case of reconfiguration and should be performed whenever there is a network failure or whenever one or more sections of a feeder have been taken out of service for maintenance. In such cases, loads that are supplied through lines sections that are downstream of portions removed for maintenance may be supplied by the closing of switches to the others feeders. By classical methods of reconfiguration, several switches may be required beyond those used to perform the restoration service. This includes switching feeders in the same substation or for substations that do not have any direct connection to the faulted feeder. These operations can cause discomfort, losses and dissatisfaction among consumers, as well as a negative reputation for the energy company. The purpose of this thesis is to develop a heuristic for reconfiguration of a distribution network, upon the occurrence of a failure in this network, making the switching only for feeders directly involved in this specific failed segment, considering that the switching applied is related exclusively to the isolation of failed sections and bars, as well as to supply electricity to the islands generated by the condition, with significant reduction in the number of applications of load flows, due to the use of sensitivity parameters for determining voltages and currents estimated on bars and lines of the feeders directly involved with that failed segment. A comparison between this process and classical methods is performed for different test networks from the literature about networks reconfiguration / A reconfigura??o de uma rede de distribui??o ? uma modifica??o na sua topologia, objetivando o atendimento de determinadas condi??es operativas dessa rede, atrav?s da mudan?a de estado das suas chaves, sem que qualquer anomalia tenha ocorrido no sistema. A recomposi??o de servi?o ? um caso particular da reconfigura??o e dever? ser realizada sempre que ocorrer defeito na rede ou sempre que um ou mais trechos de um alimentador tenham sido retirados de servi?o para manuten??o. Nesses casos, cargas que s?o atendidas por trechos que est?o a jusante de trechos retirados para manuten??o, poder?o ser atendidas pelo fechamento de chaves pertencentes ao mesmo alimentador ou atrav?s de chaves para outros alimentadores. Pelos m?todos de reconfigura??o cl?ssicos, v?rios chaveamentos poder?o ser necess?rios, al?m daqueles utilizados apenas para realizar a recomposi??o do servi?o. Isso inclui chaveamentos em alimentadores da mesma subesta??o ou de outras subesta??es que n?o guardam qualquer rela??o direta com o alimentador sob defeito. Esses ?ltimos chaveamentos provocar?o desconforto, preju?zos e insatisfa??o nos consumidores, al?m de preju?zos para a imagem da concession?ria de energia el?trica. ? objetivo desta tese desenvolver uma heur?stica para reconfigura??o de uma rede de distribui??o, quando da ocorr?ncia de um defeito nessa rede, que realize chaveamentos apenas nos alimentadores diretamente envolvidos no defeito, considerando que esses chaveamentos s?o aqueles destinados exclusivamente ? isola??o das barras e trechos defeituosos e ao atendimento das ilhas por ele geradas, com redu??o significativa do n?mero de aplica??es de fluxos de carga, face ? utiliza??o de par?metros de sensibilidade para a determina??o de tens?es e correntes estimadas nas barras e trechos dos alimentadores diretamente envolvidos com o defeito. Uma compara??o desse processo com os m?todos cl?ssicos ? realizada para v?rias redes testes obtidas na literatura sobre reconfigura??o de redes

Page generated in 0.0396 seconds