Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-07-07T13:19:03Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) UFPE TESE MDU pdf.pdf: 6598491 bytes, checksum: b2735ba43bc5f1fa72db66bef662ebaa (MD5) / Made available in DSpace on 2016-07-07T13:19:03Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) UFPE TESE MDU pdf.pdf: 6598491 bytes, checksum: b2735ba43bc5f1fa72db66bef662ebaa (MD5) Previous issue date: 2015-03-12 / O que se pretende nesta tese é analisar até onde os processos e fenômenos econômicos que estão acontecendo no entorno do Complexo Portuário Industrial de Suape – CIPS estão efetivamente determinando uma nova configuração espacial metropolitana. Parte-se da hipótese de que a estrutura espacial que vem sendo gestada no entorno do CIPS vem fortalecendo a articulação entre esse complexo e a Cidade do Recife, núcleo da RMR, e, portanto, vem reforçando o caráter monocêntrico dessa metrópole, em detrimento da emergência de uma nova centralidade no território do complexo. A metodologia adotada estabelece definições e teorias que contribuem para o tratamento objetivo da questão e ajuda a entender as estruturas econômicas e espaciais interurbanas, mais especificamente, os fluxos materiais que emanam do CIPS e de seu entorno, com implicações na estrutura espacial do território. Assume-se, também, como questão central, que a rede urbana – bem como os indicadores de performance econômica e social que se estabelecem a partir das estruturas físico-territoriais existentes –, consiste na condição fundamental para direcionar o processo de integração econômica e social e a consequente criação de novas centralidades. Assume-se, também, que o processo de desenvolvimento em curso no Estado de Pernambuco é um processo modernizante em bases conservadoras, no qual se assiste ao tradicional pacto político-social e tecnocrático do setor público com a tecnocracia e o grande capital imobiliário. Não há mudanças substanciais nos padrões das estruturas sociais, culturais e econômicas, e sim a manutenção e perpetuação do status quo pré-existente no que pese a transformações modernizadoras. Por fim, conclui-se que a Cidade do Recife, por possuir fortes características de polarização e atratividade em seu eixo central, além de vantagens competitivas históricas e naturais construídas ao longo do seu processo de desenvolvimento, possui fortes economias locais de aglomeração que fortalecem ainda mais a sua estrutura monocêntrica, em detrimento da criação de novas centralidades urbanas dinâmicas em seu entorno. / The aim of this thesis is to analyze how far the processes and economic phenomena that are going on around the Industrial Port Complex of Suape - CIPS are effectively determining a new metropolitan spatial configuration . It starts with the hypothesis that the spatial structure that it is growing in the vicinity of CIPS is strengthening the links between this complex and the City of Recife, core of RMR, and therefore has reinforced the monocentric character of this metropolis, to the detriment of emergence of a new centrality in the territory of the complex. The methodology establishes definitions and theories that contribute to the treatment purpose of the issue and help us to understand the economic and spatial structures long distance. More specifically, the structures include the material flows emanating from the CIPS and its surroundings, with implications for the spatial structure of the territory, and also the central issue, the urban network – and the indicators of economic and social performance that are established from the existing physical and territorial structures. This is the fundamental condition to direct the process of economic and social integration and the subsequent creation of new centers. It should also be assumed that the ongoing development process in the state of Pernambuco is a modernizing process on conservative bases, in which we witness the traditional political and social pact and technocratic public sector with the technocracy and the great real estate capital. There are no changes in the patterns of social, cultural and economic structures, but the maintenance and perpetuation of the pre-existing status quo despite the modernizing transformations. Finally, we have concluded that the city of Recife, because it has strong characteristics of polarization and attractiveness in its central axis, in addition to historical and natural competitive advantages built over its development process, has strong local agglomeration economies that greatly strengthen its monocentric structure, rather than creating new dynamic urban centralities in its surroundings.

Durant cette derni��re d��cennie, la diffusion du format XML pour repr��senter les donn��es g��n��r��es par et ��chang��es sur le Web a ��t�� accompagn��e par la mise en ��uvre de nombreux moteurs d'��valuation de requ��tes et de mises �� jour XQuery. Parmi ces moteurs, les syst��mes " m��moire centrale " (Main-memory Systems) jouent un r��le tr��s important dans de nombreuses applications. La gestion et l'int��gration de ces syst��mes dans des environnements de programmation sont tr��s faciles. Cependant, ces syst��mes ont des probl��mes de passage �� l'��chelle puisqu'ils requi��rent le chargement complet des documents en m��moire centrale avant traitement.Cette th��se pr��sente une technique de partitionnement des documents XML qui permet aux moteurs " m��moire principale " d'��valuer des expressions XQuery (requ��tes et mises �� jour) pour des documents de tr��s grandes tailles. Cette m��thode de partitionnement s'applique �� une classe de requ��tes et mises �� jour pertinentes et fr��quentes, dites requ��tes et mises �� jour it��ratives.Cette th��se propose une technique d'analyse statique pour reconna��tre les expressions " it��ratives ". Cette analyse statique est bas��e sur l'extraction de chemins �� partir de l'expression XQuery, sans utilisation d'information suppl��mentaire sur le sch��ma. Des algorithmes sont sp��cifi��s, utilisant les chemins extraits par l'��tape pr��c��dente, pour partitionner les documents en entr��e en plusieurs parties, de sorte que la requ��te ou la mise �� jour peut ��tre ��valu��e sur chaque partie s��par��ment afin de calculer le r��sultat final par simple concat��nation des r��sultats obtenus pour chaque partie. Ces algorithmes sont mis en ��uvre en " streaming " et leur efficacit�� est valid��e exp��rimentalement.En plus, cette m��thode de partitionnement est caract��ris��e ��galement par le fait qu'elle peut ��tre facilement impl��ment��e en utilisant le paradigme MapReduce, permettant ainsi d'��valuer une requ��te ou une mise �� jour en parall��le sur les donn��es partitionn��es.

In conventional remote sensing, visible-near infrared (VNIR) and shortwave infrared (SWIR) part of the electromagnetic spectrum (EMS) have been utilized for lithological discrimination extensively. Additionally, TIR part of the EM spectrum can also be utilized for discrimination of surface materials either through emissivity characteristics of materials or through radiance as in VNIR and SWIR. In this study, ASTER thermal multispectral infrared data is evaluated in regard to lithological discrimination and mapping through emissivity values rather than conventional methods that utilize radiance values. In order to reach this goal, Principle Component Analysis (PCA) and Decorrelation Stretch techniques are utilized for ASTER VNIR and SWIR data. Furthermore, the spectral indices which directly utilize the radiance values in VNIR, SWIR and TIR are also included in the image analysis. The emissivity values are obtained through Temperature-Emissivity Separation (TES) algorithm. The results of the image analyses, except spectral indices, are displayed in RGB color composite along with the geological map for visual interpretation. The results showed that utilizing emissivity values possesses potential for discrimination of organic matter bearing surface mixtures which has not been possible through the conventional methods. Additionally, PCA of emissivity values may increase the level of discrimination even further. Since the emissivity utilization is rather unused throughout in literature and new, further assessment of accuracy is highly recommended along with the field validations.

Driving with the cold engine increases fuel consumption and greenhouse gases emissions. A latent heat energy storage device has been proposed to recover waste heat and reduce engine warm-up time by using phase change materials (PCMs) as an energy storage medium. Two types of paraffin waxes and 50/50 mixture of the two have been examined to characterize their behaviors under repetitive heating/freezing. From the results, the heat transfer is more effective in the case of narrower spacing distances between the cooling plates and high circulating flow rate of the heat transfer fluid. A 50/50 mixture of two paraffin waxes also provides better heat transfer due to the possible existence of both conduction and natural convection. The results of the metal block simulation experiments demonstrated the potential of latent heat TES’s for use in engine warm-up.

Driving with the cold engine increases fuel consumption and greenhouse gases emissions. A latent heat energy storage device has been proposed to recover waste heat and reduce engine warm-up time by using phase change materials (PCMs) as an energy storage medium. Two types of paraffin waxes and 50/50 mixture of the two have been examined to characterize their behaviors under repetitive heating/freezing. From the results, the heat transfer is more effective in the case of narrower spacing distances between the cooling plates and high circulating flow rate of the heat transfer fluid. A 50/50 mixture of two paraffin waxes also provides better heat transfer due to the possible existence of both conduction and natural convection. The results of the metal block simulation experiments demonstrated the potential of latent heat TES’s for use in engine warm-up.

COSTA, C. F. Nearest Neighbors with Operating Time Constraints and Optimal Sequenced Route Queries in Time-Dependent Road Networks. 2014. 75 f. Dissertação (Mestrado em Ciência da Computação) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2014. / Submitted by Daniel Eduardo Alencar da Silva (dealencar.silva@gmail.com) on 2015-01-23T20:05:38Z No. of bitstreams: 1 2014_dis_cfcosta.pdf: 2126584 bytes, checksum: a2635ed2f82226579173a9e49d960c00 (MD5) / Approved for entry into archive by Rocilda Sales(rocilda@ufc.br) on 2015-09-23T16:29:29Z (GMT) No. of bitstreams: 1 2014_dis_cfcosta.pdf: 2126584 bytes, checksum: a2635ed2f82226579173a9e49d960c00 (MD5) / Made available in DSpace on 2015-09-23T16:29:29Z (GMT). No. of bitstreams: 1 2014_dis_cfcosta.pdf: 2126584 bytes, checksum: a2635ed2f82226579173a9e49d960c00 (MD5) Previous issue date: 2014 / In this thesis we study the problems of processing a variation of nearest neighbors and of routing planning queries in time-dependent road networks, i.e., one where travel time along each edge is a function of the departure time. We first study the problem of finding the k points of interest (POIs), for example, museums or restaurants, in which a user can start to be served in the minimum amount of time, accounting for both the travel time to the POI and the waiting time there, if it is closed. Previous works have proposed solutions to answer k-nearest neighbor queries considering the time dependency of the network but not the operating times of the points of interest. We propose and discuss three solutions to this type of query which are based on the previously proposed incremental network expansion and use the A* search algorithm equipped with suitable heuristic functions. We also present experimental results comparing the number of disk access required in each solution with respect to a few different parameters. In the second query, we aim at finding the optimal route that connects a origin to a destination and passes through a number of POIs in a specific sequence imposed on the categories of the POIs. Previous works have addressed this problem, but they do not consider the time dependency of the network. We propose an optimal sequenced route query algorithm which performs an incremental network expansion adopting an A* search. Furthermore, as an OSR query on road network tends to re-expand an extremely large number of nodes, we propose a scheme to reduce the re-expansions. For comparison purposes, we also present a baseline solution which was obtained by extending the previously proposed progressive neighbor exploration algorithm to cope with the time-dependent problem. We performed experiments in synthetic networks comparing the proposed solutions according to the number of expanded vertices in the search and the processing time of the queries. / Nesta dissertação nós estudamos os problemas de processar uma variação de consulta de vizinhos mais próximos e de planejamento de rotas em redes viárias dependentes do tempo. Diferentemente de redes convencionais, onde o custo de deslocamento de um ponto a outro é geralmente dado pela distância física entre esses dois pontos, uma rede dependente do tempo representa de forma mais realista o custo de realizar esse deslocamento, considerando o histórico das condições de tráfego. Mais especificamente, o tempo que um objeto móvel leva para percorrer uma via em tal rede depende do tempo de partida. Por exemplo, o tempo para se deslocar de um ponto a outro em grandes centros durante os horários de pico, quando o tráfego é intenso e as ruas estão congestionadas, é muito maior do que em horários normais. Dentro do contexto apresentado, primeiramente nós estudamos o problema de encontrar k pontos de interesse, como por exemplo, museus ou restaurantes, nos quais um usuário pode começar a ser servido o mais rápido possível. Em outras palavras, nós buscamos minimizar a soma do tempo de viagem até um ponto de interesse mais o tempo de espera até que ele abra, caso esteja fechado. Trabalhos anteriores tratam do problema de encontrar os k vizinhos mais próximos em redes dependentes do tempo, porém, eles não levam em consideração o horário de funcionamento dos pontos de interesse. Desta forma, a consulta abordada nesses trabalhos pode retornar pontos de interesse que estão mais próximos do usuário, considerando um dado tempo de partida, mas que podem demorar para abrir, fazendo com que o usuário espere por muito tempo. Nós propomos e discutimos três soluções para essa consulta que são baseadas em um algoritmo de expansão incremental da rede previamente proposto na literatura e usam o algoritmo de busca A* equipado com funções heurísticas adequadas para cada solução. Com o uso do algoritmo A*, nós visamos reduzir o percentual da rede avaliado na busca, evitando expandir vértices que oferecem uma baixa probabilidade de alcançar nosso objetivo. Também apresentamos resultados experimentais que comparam o número de acessos ao disco exigido em cada solução em relação a alguns parâmetros diferentes e que indicam em que casos deve-se optar por cada solução. Na segunda consulta, nós visamos encontrar a rota ótima que conecta uma dada origem a um dado destino e que passa por uma série de pontos de interesse pertencentes a categorias determinadas pelo usuário em uma certa ordem também especificada pelo usuário. Esse tipo de consulta é conhecida como OSR, do inglês, Optimal Sequenced Route, na literatura. Como exemplo, considere que alguém está indo do trabalho para casa e no seu caminho deseja passar em um banco para sacar dinheiro e depois ir a um restaurante para jantar. Embora existam vários bancos e restaurantes em uma cidade, uma consulta OSR deve procurar pelo banco e pelo restaurante que minimizam o custo da viagem do trabalho para casa. Trabalhos anteriores propuseram soluções para consultas OSR em redes com arestas de custo fixo, mas nenhum deles considerou que esse custo pode variar de acordo com o tempo de partida. Nós propomos uma solução ótima para esse problema que, assim como as abordagens propostas para o problema anterior, expande a rede incrementalmente e usa o algoritmo A* para guiar essa expansão. Além disso, como uma consulta OSR em redes viárias tende a re-expandir um número muito grande de vértices, nós incorporamos à essa solução um esquema para reduzir o número de re-expansões. Nós também apresentamos resultados experimentais que mostram a eficiência dessa solução em comparação com uma solução de base que foi obtida a partir da estensão de um algoritmo anteriormente proposto na literatura. Todos os experimentos foram realizados em redes sintéticas.

The world is ever increasing in its energy usage, making energy that is sustainable and secure harder to achieve. To fulfil the Paris agreement to limit global warming, the world needs to transition from fossil fuels toward more renewable energy sources, like wind and solar, but these sources have fluctuation in supply which often create a mismatch with demand. To combat this issue, thermal energy storage can be utilized, and one such technology is latent heat thermal energy storage. This study aimed to investigate the potential of latent heat thermal energy storage by developing a simple model of such a system and studying its impact on Rocklunda’s sport facilities. The model was developed by using MATLAB, primarily using the photovoltaic overproduction of the facilities to store as energy for the latent heat thermal energy storage. The implemented storage, based on the model’s result, had overall positive impact on the facilities. The optimized storage capacity was about 510 kWh, which throughout the storage’s lifetime would save ~4 989 MWh worth of heat by using the best performing phase change material: aluminium-silicon. The storage would also be able to utilize ~82% of the annual photovoltaic overproduction that would otherwise be unused/sold as well as reducing the heat demand by ~12% by using the heat stored via the storage. The implementation also proved to have beneficial effects on the environment as the saved heat was the equivalent of mitigating ~304 ton of CO2 emissions. Furthermore, there is a profit of ~236 000 SEK. / Reduction and Reuse of energy with interconnected Distribution and Demand (R2D2)

May 25, 2011, Reuters’ headline read: "New York State is prepared for summerelectricity demand". The NY operator forecasts for next summer a peak of 33GW, close to therecord ever reached. With soaring cooling demands, the electricity peak load represents a substantialconcern to the energy system. In the goal of peak shaving, research on alternative solutions based onThermal Energy Storage (TES), for both cooling and heating applications, has been largely performed.This thesis addresses thermal comfort applications with use of active free cooling through implementationof latent heat based TES. Active free cooling is based on the use of the freshness of a source, the outsideair for example, to cool down buildings. This work conceptualizes the implementation of TES basedcooling system with use of Phase Change Material in an in-house-built model. The principle of PhaseChange Material, or Latent Heat TES (LHTES), lies on latent energy which is the energy required for thematerial to change phase. In order to properly size this cooling system, a multi-objective optimization isadopted. This optimization, based on minimization of multi-objective functions, led to optimal designconfigurations. In parallel, the electrical consumption of the system and the volume uptake of the systemwere also considered. Through the obtained optimization studies, we identified non-linearinterdependency between the two objective functions: the cost of the system and the acceptable remainingcooling needs. By remaining cooling needs, we mean the cooling needs that the system cannot meet. As amatter of fact, sizing the system according to these cooling needs would imply a very high cost. It wasfound that for a certain amount of remaining cooling needs, the PCM-based cooling system reveals to bean interesting solution compared to conventional air conditioning in terms of electrical consumption andoverall system cost. / Best Master Thesis Award, granted by French Academic Institute / Cold Thermal Energy Storage

Le fond diffus cosmologique (CMB) est la première lumière libérée par l’Univers.À ce titre, elle constitue la photographie la plus ancienne à laquelle nous ayons accès.Ces photons recèlent des trésors d’informations capables de nous renseigner tant sur le contenu énergétique de l’Univers que sur son histoire. En retraçant son évolution jusqu’aujourd’hui, on est capable d’établir des scénarios quant à la période qui a précédé l’émission du CMB, inaccessible aux observations. Plus particulièrement,la plupart des modèles s’accordent à dire que l’Univers aurait connu juste après le Big Bang une période d’expansion exponentielle qualifiée d’inflation. L’un des défis majeurs de la cosmologie consiste à confirmer et contraindre ces modèles en cherchant sur le CMB les empreintes théoriques laissées par l’inflation : un motif de polarisation qualifié de mode B. Cependant, ce signal est attendu à un niveau très faible, sa détection requiert donc la mise en place d’instruments extrêmement sensibles. Cette thèse s’inscrit dans l’effort technologique mené au sein du projet QUBIC pour cette quête. Dans cette optique on s’est intéressé aux détecteurs, des matrices de plusieurs centaines de bolomètres supraconducteurs. Dans un premier temps, on a défini une méthode permettant de dimensionner les détecteurs et la matrice pour répondre au mieux à nos attentes à travers l’ajustement de paramètres pertinents. Puis on a mené pour la première fois dans la collaboration toute la réalisation d’une matrice de 256détecteurs sur laquelle on a par la suite effectué et exposé des tests préliminaires prometteurs pour la future implémentation du plan focal de QUBIC. / The cosmic microwave background (CMB) is the very first light of the Uni- verse and thus constitutes the oldest picture of its initial state. These photons carry valuable information constraining both the energy content and the history of the Universe. CMB observations allow us to reconstruct what occurred before the CMB anisotropies were imprinted. The most promising theoretical models all postulate an epoch of exponential expansion known as inflation just after the Big Bang. One of the major challenges of observational cosmology is hence to confirm or falsify inflation as well as to discover how inflation was realized in a particular model by searching for its imprint on the CMB polarization B-mode. This signal is however expected to be extremely weak and its detection requires a very sensitive experiment. This thesis reports on contributions to the technology development for the innovative QUBIC instrument, focusing on the perfection of an array of several hundreds of supercon- ducting bolometric detectors. A method was defined to design the detector array through tuning the relevant parameters to best meet our requirements. Then a 256- detector prototype array was fully manufactured and characterized. The preliminary characterization gave promising results for the forthcoming implementation of the QUBIC focal plane.

This study investigates the feasibility and performance of a hybrid system integrating photovoltaic (PV) and solar thermal technologies for industrial process heat. By analyzing various parameters including cost, income, energy production, and system specifications, valuable insights are obtained. The study explores the potential of solar heating (SH) systems as a renewable thermal energy source for industrial processes, overcoming challenges of high costs and limited fossil fuel usage in industrial facilities through hybrid configurations. Data analysis includes cost analysis, income generation, energy balance, and system specifications such as temperature ranges, collector sizes, and efficiencies. While acknowledging limitations in simulation simplifications and the use of a single load profile, the study presents conclusions on the system's economic viability, technical capabilities, and potential applications. The findings highlight the importance of hybrid PV and solar thermal systems in enhancing energy efficiency and promoting renewable energy adoption in industrial process heating.