Made available in DSpace on 2014-12-17T14:05:21Z (GMT). No. of bitstreams: 1 UedsonPJ_TESE.pdf: 4652732 bytes, checksum: 9faad092c54691708dbf548da7b7add7 (MD5) Previous issue date: 2012-09-28 / Worldwide, families Carangidae and Rachycentridae represent one of the groups most important commercial fish, used for food, and great potential for marine aquaculture. However, the genetic bases that can underpin the future cultivation of these species, cytogenetic between these aspects are very weak. The chromosomal patterns have provided basic data for the exploration of biotechnological processes aimed at handling chromosomal genetic improvement, such as induction of polyploidy, androgenesis and ginogenesis, as well as obtaining monosex stocks and interspecific hybridizations. This paper presents a comprehensive cytogenetic survey in 10 species, seven of the family Carangidae and the monotypic family Rachycentridae. Classical cytogenetic analysis and in situ mapping of multigene sequences were employed, and additionally for the genus Selene and morphotypes of Caranx lugubris, comparisons were made using geometric morphometrics. In general, conservative species exhibit a marked chromosome number (2n=48). Although present in large part, different karyotypic form, retain many characteristics typical of chromosomal Order Perciformes, the high number of elements monobrachyal, Ag-NORs/18S rDNA sites and heterochromatin simply reduced, preferably centromeric. The main mechanisms involved in karyotypic diversification are the pericentric inversions, with secondary action of centric fusions. In addition to physical mapping and chromosome detail for the species are presented and discussed patterns of intra-and interspecific diversity, cytotaxonomic markers. This data set provides a better understanding of these patterns caryoevolutyonary groups and conditions for the development of protocols based on Biotechnology for chromosomal manipulation Atlantic these species / Entre os peixes marinhos, as fam?lias Carangidae e Rachycentridae se apresentam como grupos de grande import?ncia comercial pela pesca e potencial para piscicultura marinha. Entretanto, bases gen?ticas que possam alicer?ar o futuro cultivo destas esp?cies, sobretudo seus aspectos citogen?ticos s?o incipientes. Os padr?es cromoss?micos t?m fornecido dados b?sicos para a prospec??o de processos biotecnol?gicos de manipula??o cromoss?mica voltados ao melhoramento gen?tico, como a indu??o a poliploidia, ginog?nese e androg?nese, assim como obten??o de estoques monossexo e hibridiza??es interespec?ficas. Neste trabalho ? apresentado um amplo levantamento citogen?tico em 10 esp?cies, sendo sete da fam?lia Carangidae e de Rachycentron canadum, esp?cie monot?pica da fam?lia Rachycentridae. A caracteriza??o citogen?tica cl?ssica e mapeamento in situ de sequ?ncias multig?nicas foram empregadas. Adicionalmente em esp?cies do g?nero Selene e em morf?tipos de Caranx lugubris foram realizadas compara??es atrav?s de morfometria geom?trica. Em geral, as esp?cies exibiram um marcante conservadorismo cromoss?mico num?rico (2n=48). Apesar de apresentar, em grande parte, f?rmulas cariot?picas diferenciadas, conservam diversas caracter?sticas cromoss?micas t?picas da Ordem Perciformes, como elevado n?mero de elementos monobraquiais, s?tios Ag-RONs/ DNAr 18S simples e heterocromatina reduzida, preferencialmente centrom?rica. Os principais mecanismos envolvidos na diversifica??o cariot?pica s?o as invers?es peric?ntricas, com a??o secund?ria de fus?es c?ntricas. Al?m do mapeamento f?sico e detalhamento cromoss?mico para as esp?cies s?o apresentados e discutidos padr?es de variabilidade intra e diversifica??o interespec?ficas, com identifica??o de marcadores citotaxon?micos. Este conjunto dos dados propicia um melhor conhecimento dos padr?es carioevolutivos destes grupos e condi??es para o desenvolvimento de protocolos biotecnol?gicos baseados na manipula??o cromoss?mica para estas esp?cies Atl?nticas

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-20T22:47:58Z No. of bitstreams: 1 LuisKennedyAndradeDeSousa_DISSERT.pdf: 5262819 bytes, checksum: 804c2a834cbc99f7b44d5b9292ca41db (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-24T21:52:22Z (GMT) No. of bitstreams: 1 LuisKennedyAndradeDeSousa_DISSERT.pdf: 5262819 bytes, checksum: 804c2a834cbc99f7b44d5b9292ca41db (MD5) / Made available in DSpace on 2017-02-24T21:52:22Z (GMT). No. of bitstreams: 1 LuisKennedyAndradeDeSousa_DISSERT.pdf: 5262819 bytes, checksum: 804c2a834cbc99f7b44d5b9292ca41db (MD5) Previous issue date: 2016-09-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A modelagem anal?gica, desde o s?culo XIX, vem sendo usada para simular estruturas geol?gicas com o objetivo de entender os mecanismos que controlam sua geometria e cinem?tica. O uso desta ferramenta na ind?stria do petr?leo, para ajudar a interpreta??es s?smicas e, principalmente, para procurar armadilhas estruturais, contribu?ram para difundir o uso desta ferramenta na literatura. Estudos envolvendo a modelagem anal?gica de invers?o de bacias s?o desenvolvidos para melhorar o entendimento dos fatores que influenciam na reativa??o das estruturas pr?-existentes, bem como sua geometria. Neste trabalho, procurou-se analisar a constru??o da arquitetura estrutural de um modelo de sistemas de falhas que sofre invers?o positiva, e analisar a rela??o entre a gera??o de novas falhas e a reativa??o das falhas normais pr?- existentes, durante um evento contracional. Adicionalmente, efetuou-se a an?lise do comportamento e distribui??o do strain ao longo do processo deformacional a partir de imagens obtidas e processadas pelo sistema Particle Image Velocimetry (PIV). Foram estudados duas s?ries de experimentos: i) S?rie I: Analisou-se a gera??o de falhas associadas a gera??o de uma falha l?strica principal e sua reativa??o durante a invers?o cinem?tica. Nesta s?rie, dois tipos de modelos foram realizados: um com a falha l?strica, ortogonal a dire??o de tra??o e compress?o (S?rie IA), e no outro a falha l?strica foi obl?qua (??? = 80?) (S?rie IB). A configura??o estrutural final da invers?o positiva mostrou a reativa??o da falha principal, com a reativa??o de algumas falhas normais que delimitam a estrutura grabenforme. Empurr?es e retroempurr?es s?o desenvolvidos e se enra?zam a partir da por??o basal da falha l?strica, ou se desenvolveram na parte superior do pacote sedimentar, propagando-se em dire??o ? base da estrutura grabenforme; ii) S?rie II: Analisou-se a gera??o de falhas associadas ? forma??o de uma falha mestra planar, ortogonal ? dire??o de tra??o/compress?o. Nestes experimentos procurou-se tamb?m observar o papel da reologia na predisposi??o de falhas normais serem reativadas. Para esta s?rie de experimentos, tr?s tipos de experimentos foram realizados com sequ?ncias pr?-tect?nicas constitu?das por diferentes tipos de material: apenas areia (s?rie IIA); areia e gesso (s?rie IIB); e areia e argila (s?rie IIC). Nos experimentos da s?rie II, a arquitetura estrutural final mostra que falhas normais foram completamente ou parcialmente reativadas, al?m do desenvolvimento de empurr?es e retroempurr?es que seccionam a por??o basal da estrutura grabenforme. Os dados obtidos com o sistema PIV, mostraram que durante o v in?cio da compress?o, a deforma??o foi absorvida primeiramente pela compacta??o do material granular, e que ap?s este processo, ocorre a reativa??o e cria??o de novas falhas, e que determinadas falhas alternam em intervalos ativos e inativos. / Analog modeling has been used since the XIX century to simulate geological structures in order to understand the mechanisms that control their geometry and kinematics. The use of this tool in the oil industry, to help seismic interpretations (mainly searching for structural traps), helped to spread its use in the literature. Studies involving basin inversion are developed to improve understanding factors that influence the reactivation of pre-existing structures as well as their geometry. In this work, we analyze the construction of the structural architecture of a fault system that underwent positive inversion, and analyzed the relationship between the generation of new faults and reactivation of pre-existing normal faults during a contraction event. In addition, the behavior and distribution of strain along the deformation process were performed based on images obtained and processed by Particle Image Velocimetry (PIV) system. Two series of experiments were developed: i) Series I: we analyzed the generation of fault sets associated with a main listric fault and their reactivation during an inversion event. Two types of models were performed: one with listric fault, orthogonal to the direction of tension and compression (series IA), while in the other the l?strica fault was oblique (obliquity = 80) (series IB). The final structural configuration after inversion showed major fault and some of the normal faults (delimiting the grabenform structure) reactivated. Thrust and backthrust were developed from the basal portion of listric fault, or in the upper part of the model, propagating towards the base of grabenform structure; ii) Series II: we analyzed the generation of faults associated with the formation of a planar master fault, orthogonal to the direction of both tension and compression. In these experiments, the role of rheology during normal faults reactivation was analyzed. Three types of experiments were done varying the materials of the pre-tectonic sequences: sand only (series IIA); sand and gypsum ponder (series IIB); and sand and clay (series IIC). These experiments displayed the final architecture with normal faults completely or partially reactivated, and the developed thrusts and backthrust sliced up the basal portion of the grabenform structure. PIV data showed that during the first stages of compression, deformation was absorbed mainly by rearrangement of the granular material (compactation) and only after this process fault reactivation (or new fault) occurs. During deformation, some faults alternated intervals of activity and inactivity.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-06-02T19:15:14Z No. of bitstreams: 1 ThatianaCristinaPereiraDeMacedo_DISSERT.pdf: 3768297 bytes, checksum: d9955850273479736f103ea6caab98f3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-06-05T19:38:31Z (GMT) No. of bitstreams: 1 ThatianaCristinaPereiraDeMacedo_DISSERT.pdf: 3768297 bytes, checksum: d9955850273479736f103ea6caab98f3 (MD5) / Made available in DSpace on 2017-06-05T19:38:31Z (GMT). No. of bitstreams: 1 ThatianaCristinaPereiraDeMacedo_DISSERT.pdf: 3768297 bytes, checksum: d9955850273479736f103ea6caab98f3 (MD5) Previous issue date: 2017-02-13 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / O presente trabalho teve como objetivo realizar um estudo do comportamento reol?gico, mec?nico e microestrutural da blenda poli(metacrilato de metila)/policarbonato (PMMA/PC), utilizando um PMMA com part?culas elastom?ricas at? a invers?o de fase. A prepara??o da blenda PMMA/PC foi feita em extrusora rosca simples e rosca dupla co-rotacional, com posterior moldagem por inje??o. As mudan?as nas caracter?sticas f?sicas e qu?micas do policarbonato foram analisadas por viscosimetria e por espectroscopia de absor??o no infravermelho por transformada de Fourier (FTIR), antes e ap?s o processamento. As caracteriza??es mec?nicas foram realizadas por ensaio de tra??o uniaxial e impacto Izod. Os ensaios reol?gicos foram feitos por medidas de ?ndice de fluidez (MFI) e reometria capilar. Para a an?lise microestrutural da blenda polim?rica foram utilizados microscopia de for?a at?mica (AFM) e microscopia eletr?nica de varredura (MEV). A temperatura de in?cio de decomposi??o t?rmica foi determinada por an?lise termogravim?trica (TG). Os resultados do MFI nas condi??es de processamento indicaram maior fluidez do policarbonato e que, entre todas as composi??es estudadas, a maior parte delas apresentou maior valor de MFI para os materiais processados em extrusora rosca dupla. Por reometria capilar dos materiais sem processamento, observou-se menor varia??o da viscosidade do PC em fun??o do aumento da taxa de cisalhamento. Por TG, foi verificada maior temperatura de in?cio de degrada??o para o PC, mas o processamento alterou mais a estabilidade t?rmica desse pol?mero do que para o poli(metacrilato de metila). As medidas de viscosidade intr?nseca do policarbonato indicaram uma poss?vel degrada??o por cis?o de cadeias, ap?s o processamento, devido a diminui??o da massa molar do material. Por FTIR, n?o foram identificadas bandas distintas para o PC antes e ap?s o processamento. A caracteriza??o mec?nica por tra??o uniaxial revelou maior resist?ncia m?xima ? tra??o, maior m?dulo de elasticidade e maior alongamento na ruptura para o policarbonato e que a compatibilidade da blenda PMMA/PC variou com a concentra??o de PC, sendo observadas algumas composi??es que apesentaram sinergismo nas propriedades. Por resist?ncia ao impacto Izod, foi constatada a elevada resist?ncia ao impacto do PC, quando comparado ao PMMA, mas a adi??o de 20% em massa de PC na matriz de PMMA elevou de forma significativa a resist?ncia ao impacto da blenda PMMA/PC. Pela an?lise morfol?gica por AFM, foi poss?vel visualizar a presen?a de part?culas elastom?ricas esf?ricas com tamanho m?dio de cerca de 182 ? 20 nm no PMMA, distribu?das de forma uniforme ao longo de sua microestrutura; enquanto o PC apresentou apenas uma fase homog?nea. Para a blenda PMMA/PC, verificou-se a presen?a de duas fases bem definidas ao longo de todas as composi??es, e houveram ind?cios de morfologia com caracter?sticas de co-continuidade para as composi??es entre a 70/30 e 50/50, tanto para os materiais processados em extrusora rosca simples quanto em rosca dupla. No que diz respeito as propriedades mec?nicas da blenda PMMA/PC, as composi??es com maior percentual de PMMA foram as que apresentaram melhores resultados de alongamento na ruptura e resist?ncia na ruptura, com propriedades intermedi?rias de resist?ncia ao impacto Izod. Na invers?o de fases, por sua vez, os resultados seguiram as caracter?sticas do policarbonato, n?o havendo ganhos significativos de propriedades. / The aim of this work was to study the rheological, mechanical and microstructural behavior of poly (methyl methacrylate)/polycarbonate (PMMA/PC) blends using a PMMA with elastomeric particles until phase inversion. The PMMA/PC blends were processed in single screw extruder and co-rotational twin screw extruder, with subsequent injection molding. The changes in the physical and chemical characteristics of the polycarbonate were analyzed by viscosimetry and by Fourier transform infrared spectroscopy (FTIR) before and after processing. The mechanical characterizations were performed by uniaxial tensile test and Izod impact. The rheological tests were done by melt flow index (MFI) and capillary rheometry. Microstructural analysis of the polymer blends was performed using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The thermal degradation temperature was determined by thermogravimetric analysis (TGA). The results of the MFI in the processing conditions indicated a higher flowability of the polycarbonate among all the studied compositions; most of them present higher value of MFI for the materials processed in twin screw extruder. In the capillary rheometry of the unprocessed materials a lower PC viscosity variation was observed as a function of the shear rate increase. TGA showed a higher degradation onset temperature for the PC, but the processing altered the thermal stability of that polymer more than for poly (methyl methacrylate). The intrinsic viscosity measurements of the polycarbonate indicated a possible degradation by chain scission after processing due to the decrease in the molar mass of the material. The FTIR did not identify distinct bands for the PC before and after the processing. The mechanical characterization by uniaxial tensile revealed higher tensile strength, higher modulus of elasticity and greater elongation at break for polycarbonate, and the compatibility of PMMA/PC blends varied with PC concentration, with some compositions that showed synergism in the properties. Izod impact strength showed a high PC impact strength when compared to PMMA, but the addition of 20 wt% of PC in the PMMA matrix significantly increased the impact strength of PMMA/PC blends. The morphological analysis by AFM visualized the presence of spherical elastomeric particles with an average size of about 182 ? 20 nm in the PMMA, evenly distributed along its microstructure, while the PC presented only one homogeneous phase. The PMMA/PC blend showed two well-defined phases throughout all the compositions, and showed evidence of morphology with co-continuity characteristics for the compositions between 70/30 and 50/50 wt%, both for the materials processed in single screw extruders as well as twin screw extruders. The compositions with the highest percentage of PMMA in the PMMA/PC blends were the ones with the best results of rupture strength and elongation at break, and the Izod impact resistance showed intermediate properties. The results in the phase inversion followed the characteristics of the polycarbonate, not showing significant gains of properties.

Denna läromedelsanalys syftar till att utifrån ett variationsteoretiskt perspektiv belysa vilka möjligheter en läromedelsserie i matematik erbjuder elever att utveckla en förståelse för stambråk. Studien utgår från sex kritiska aspekter av stambråk: areamodellen, linear measurement, inverse order relationship, stambråk som mängden av en helhet, partitioning och iterating. Utifrån ett variationsteoretiskt perspektiv med en deduktiv ansats har läromedlen analyserats genom en textanalys. Resultatet visar att samtliga kritiska aspekter av stambråk finns representerade i läromedlet. Samtidigt behandlas flertalet av dem i mindre utsträckning, vilket kan leda till en begränsad concept image av stambråk hos elever. Resultatet visar även att det vanligaste variationsmönstret i läromedlen är fusion, vilket innebär att elever behöver kunna urskilja flera kritiska aspekter av lärandeobjektet samtidigt. Detta försvårar möjligheten att tillägna sig förståelsen för stambråk. I resultatet framgår det också att areamodellen är den vanligast förekommande representationsformen i läromedelsserien. En konsekvens för undervisningen blir således att representations-former som bygger på linear measurement behöver få större plats inom ramen för den ordinarie undervisningen. Detta för att elever ska få en större förståelse för stambråk och en berikad concept image vilket i sin tur möjliggör förståelsen för mer avancerade matematiska principer. Sammanfattningsvis diskuteras att lärare behöver förhålla sig kritiskt till matematikläromedel samt vara medvetna om vilka möjligheter det erbjuder.

Den inversa relationen mellan multiplikation och division innebär att räknesätten är varandras motsatser. Att använda den inversa relationen som metod innebär att man kan använda sig av multiplikation för att beräkna division men också vice versa. Förståelsen för denna relation har visat sig vara viktig för elevers talförståelse och är där med viktig att undervisa om.  Den här litteraturstudiens syfte är att sammanställa vad vetenskapliga studier belyser som betydelsefullt för elevers förståelse av den inversa relationen mellan multiplikation och division. Syftet uppfylls genom att besvara frågeställningen: Vad är betydelsefullt för att elever ska utveckla förståelse för den inversa relationen mellan multiplikation och division? Denna litteraturstudie baseras på tio systematiskt framtagna vetenskapliga tidskriftsartiklar som inhämtades via sökningar i databaserna ERIC och PsycInfo. Alla artiklar i studien är internationella och skrivna på engelska. Materialet analyserades med hjälp av inkluderings- och exkluderingskriterier samt en översiktsmall.  Resultatet visar att förståelsen för relationen mellan multiplikation och division är ett område som är bristfälligt för många elever. Detta kan ha en negativ påverkan på elevers kunskaper inom matematik och kan hämma att en djupare förståelse utvecklas. Denna litteraturstudie presenterar sex aspekter som är betydelsefulla i barns utveckling av förståelsen för den inversa relationen mellan multiplikation och division. Studien kan vara till hjälp för lärare i deras planering och utformning av undervisning kring multiplikation och division.

Je me focalise sur trois grands systèmes de failles transformantes obliques au Tibet et en Californie du Sud, et ce, afin de mieux comprendre et quantifier les relations entre les différentes structures qui les définissent. L'interférométrie radar à Synthèse d'Ouverture (InSAR) dispose du potentiel pour cartographier et localiser précisément la déformation sur des zones étendues et ainsi contraindre la géométrie des structures profondes. Cependant son utilisation en milieu naturel se trouve fortement entravée par la décorrelation due à la végétation, au relief, et aux cycles de gel et dégel, mais aussi par les délais troposphériques et les rampes orbitales résiduelles. J'ai développé des méthodes pour palier ces limitations. Au Tibet, j'ai ainsi traité les archives du satellite Envisat au niveau de deux zones de lacune sismique, à la bordure Nord du plateau, se présentant comme des zones intéressantes pour étudier le partitionnement de la convergence: le système de faille de Haiyuan au north-est Tibet et la faille sénestre de l'Altyn Tagh, au nord-ouest du plateau. Une attention spécifique sur les déformations liées au pergélisol m'a permis de (1) retrouver la continuité du signal sur de grandes zones, (2) de quantifier le comportement temporel des cycles de gel et dégel des sédiments recouvrant le pergélisol, (3) d'isoler les zones stables des sédiments se déformant. Je montre que les déformations saisonnières sont fortement dépendantes des unités géomorphologiques et que la fonte du pergélisol est plus important à faible qu'à haute altitude. J'analyse aussi le signal saisonnier au travers la marche topographique et je définie un proxy pour les incertitudes de la correction atmosphérique. J'observe un gradient de déformation au travers la faille de l'Altyn Tagh de l'ordre de 11-15 mm/an et un alignement claire de la déformation dans le Tarim, parallèle à la faille de l'Altyn Tagh, ainsi que des soulèvements de l'ordre de 1 mm/an associés à des chevauchements. Ce travail montre aussi un gradient de déformation associé à la terminaison ouest de la faille du Kunlun, re-définissant ainsi la géométrie des blocs tectoniques dans cette région. Parallèlement à cette acquisition de données, je développe des outils d'inversion basés sur des algorithmes de Monte Carlo afin d'explorer l'ensemble des géométries en accord avec les observations et d'estimer la compatibilité de la déformation actuelle avec des modèles tectoniques long-termes. Je montre ainsi une convergence uniforme de 8.5-11.5 mm/an et d'orientation N81-98E à travers le système de faille d'Haiyuan et quantifie son partitionnement le long des différentes structures. Par ailleurs, j'applique mon approche en Californie du Sud, au niveau du « Big Bend » de la faille de San Andreas où, en analogie avec des modèles structuraux géologiques, j'utilise des lois de conservations du mouvement pour contraindre la géométrie des chevauchements aveugles. Je montre la compatibilité du champs de déformation actuel avec un décollement grande échelle et quantifie une accumulation de contrainte de 2.5 mm/an le long de la structure majeure sous Los Angeles. / I focus on three major oblique transform faults in Tibet and in Southern California, in order to better measure and quantify the present-day strain accumulation on these structures. Interferometric synthetic Aperture Radar (InSAR) has the potential to map and localize precisely the deformation over wide areas and thus constrain the deep geometry of these structures. However, its application in natural environments in hindered by strong decorrelation of the radar phase due to vegetation, relief, and freeze and thaw cycles, but also due to variable tropospheric phase delays across topographic feature and long-wavelength residual orbital ramps. Here, I develop methodologies to circumvent these limitations and separate tectonic from other parasite signals. In Tibet, I process data from the Envisat satellite archives, at the boundary of the Tibetan plateau, in two seismic gaps, which appear interesting to study the partitioning of the convergence: the Haiyuan Fault system in northeastern Tibet and the left-lateral Altyn Tagh Fault, in northwestern Tibet. A specific focus on the permafrost related deformation signal allows us to: (1) correctly unwrap interferograms from north to south, (2) quantify the temporal behavior of the freeze/thaw cycles, and (3) isolate bedrock pixels that are not affected by the permafrost signal for further tectonic analysis. I show that the seasonal subsidence depends greatly on the geological land unit and that lower elevations are thawing faster than higher elevations. I analyze the atmospheric signal across the high plateau margin and estimate proxy for the uncertainty on atmospheric corrections. I observe a strike-slip deformation of around 11-15 mm/yr across the Altyn Tagh fault, a clear line of concentrated strike-slip deformation of around 3 mm/yr within the Tarim basin, trending parallel to the Altyn Tagh Fault trace, as well as thrust signal uplifting terraces at a rate of 1 mm/yr. This work also shows a strain accumulation around the west extension of the south trace of the Kunlun Fault, redefining the block boundaries in northwestern Tibet. In parallel this data acquisition, I develop Monte Carlo inversion tools in order to explore the various geometries in agreement with observations and estimate the compatibility of actual surface displacements with long-term slip partitioning models. I thus show a uniform convergence rate of 8.5-11.5 mm/yr with a N81-98E across the Haiyuan fault system and quantify the partitioning along the various structures. I also apply my approach in Southern California, across the « Big Bend » of the San Andreas Fault, where, in analogy with structural geological models, I use conservation of motion to help constraining the geometry and the kinematics of blind thrust faults. I show the compatibility of surface displacements with a large-scale décollement and quantify a loading rate of 2.5 mm/yr along the major thrust structure developing under Los Angeles.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:29Z No. of bitstreams: 1 HasanLopesShihadeh_DISSERT.pdf: 4749062 bytes, checksum: 5c56d7aad70a0d9ccc2eba27d546688b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-28T23:45:09Z (GMT) No. of bitstreams: 1 HasanLopesShihadeh_DISSERT.pdf: 4749062 bytes, checksum: 5c56d7aad70a0d9ccc2eba27d546688b (MD5) / Made available in DSpace on 2016-07-28T23:45:09Z (GMT). No. of bitstreams: 1 HasanLopesShihadeh_DISSERT.pdf: 4749062 bytes, checksum: 5c56d7aad70a0d9ccc2eba27d546688b (MD5) Previous issue date: 2015-09-08 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Neste trabalho foi realizado um estudo para a obtenc?a?o de para?metros para um modelo regional de velocidades 1D va?lido para a Provi?ncia Borborema, NE do Brasil. Para tanto, foram utilizados eventos que ocorreram na mesma entre 2001 e 2013 com magnitude acima de 2.9 e que tiveram epicentros bem determinados por redes locais de estac?o?es ou back azimuth, quando os dados sa?o de boa qualidade. Foram escolhidos 7 eventos ocorridos nas principais a?reas si?smicas da Provi?ncia Borborema. Os eventos selecionados foram, ao todo, registrados em 74 estac?o?es das redes: RSISNE, INCT-ET, Mile?nio, Joa?o Ca?mara - RN, Sa?o Rafael - RN, Caruaru - PE, Sa?o Caetano - PE, Castanha?o - CE, Santana do Acarau - CE, Taipu - RN e Sobral - CE e a estac?a?o RCBR da rede IRIS/USGS - GSN. Para a determinac?a?o dos para?metros do modelo realizou-se a inversa?o do tempo de percurso atrave?s de um ajuste de retas aos tempos observados. A validac?a?o deste modelo se deu de modo independente atrave?s da comparac?a?o com outros modelos conhecidos (globais e regionais para o Brasil). O modelo final, nomeado MBB, apresenta um modelo crustal lateralmente homoge?neo composto por duas camadas com crosta superior de 11,45 km de espessura e uma crosta com espessura total de 33,90 km, sendo a base da segunda camada limitada pela descontinuidade de Moho. A velocidade da onda P na crosta superior foi estimada em 6,00 Km/s e na crosta inferior 6,64 Km/s. A velocidade da onda P no manto superior foi estimada em 8,21 Km/s com uma raza?o VP/VS de aproximadamente 1,740 ? 0,002. / In this work it was performed a study to obtain parameters for an 1D regional velocity model for the Borborema Province, NE Brazil. It was used earthquakes occurred between 2001 and 2013 with magnitude greater than 2.9 mb either from epicentres determined from local seismic networks or by back azimuth determination, when possible. We chose seven events which occurred in the main seismic areas in the Borborema Province. The selected events were recorded in up to 74 seismic stations from the following networks: RSISNE, INCT-ET, Jo?o C?mara ? RN, S?o Rafael ? RN, Caruaru - PE, S?o Caetano - PE, Castanh?o - CE, Santana do Acarau - CE, Taipu ? RN e Sobral ? CE, and the RCBR (IRIS/USGS?GSN). For the determination of the model parameters were inverted via a travel-time table and its fit. These model parameters were compared with other known model (global and regional) and have improved the epicentral determination. This final set of parameters model, we called MBB is laterally homogeneous with an upper crust at 11,45 km depth and total crustal thickness of 33,9 km. The P-wave velocity in the upper crust was estimated at 6.0 km/s and 6.64 km/s for it lower part. The P-wave velocity in the upper mantle we estimated at 8.21 km/s with an VP/VS ratio of approximately 1.74.

The concept of a robotic manipulator is widely used throughout many industries. In this project, a manipulator of the type SCARA, selective compliance articulated robot arm, is constructed. The aim was to examine how such a robot could be constructed using 3D-printing and how accurate it would be. Other than 3D-printing, parts in the form of guiding rods, lead screw, bearings, pulleys and timing belts were used. Together with a microcontroller, the robot operates using three stepper motors. In the end it resulted in a SCARA with reasonable accuracy considering the methods used, more specifically the largest average error was 3.6cm in the X direction and 2.3 cm in the Y direction. The largest drawback of the final construction was the negative balance between tightening the belts and friction in the inner joint. Tightening the belts meant larger friction and thereby undesired movement properties. Doing the opposite meant that the belts could start slipping and enabled backlash. / Konceptet av en robotarm används brett inom många industrier. Detta projekt syftar till att konstruera en robot avtypen SCARA, selective compliance articulated robot arm. Målet var att undersöka hur en sådan robot kan 3D-printas och dess precision. Förutom 3D-printade delar användes även guidestänger, kullager, kamremmar och remskivor. Robotens rörelser styrs tillsammans med en mikrokontroller och tre stegmotorer. Med tillvägagångssätten i åtanke resulterade projektet in en SCARA med rimlig precision. Mer specifikt var medelfelet 3.6 cm i X-led och 2.3 cm i Y-led. Den största nackdelen med den slutgiltiga konstruktionenvar den negativa jämvikten mellan att spänna kamremmarna och friktionen i den inre armleden. Att spänna kamremmarna innebar en ökning i friktion och därmed oönskade rörelseegenskaper. Att göra tvärtom innebar att bältena löpte större risk att glida ur och möjliggjorde dödgång.

Made available in DSpace on 2015-03-13T17:08:29Z (GMT). No. of bitstreams: 1 TallesSF_DISSERT_1-74.pdf: 3503129 bytes, checksum: 43d4d5f0a963aecc3dec332abad3bc2d (MD5) Previous issue date: 2010-09-03 / The Cumuruxatiba basin is located at the southern coast State of Bahia in northeastern of Brazil. This basin was formed in distensional context, with rifting and subsequent thermal phase during Neocomian to late Cretaceous. At Cenozoic ages, the Abrolhos magmatism occurs in the basin with peaks during the Paleocene and Eocene. In this period, there was a kinematic inversion in the basin represented by folds related to reverse faults. Structural restoration of regional 2D seismic sections revealed that most of the deformation was concentrated at the beginning of the Cenozoic time with the peak at the Lower Eocene. The post-Eocene is marked by a decrease of strain rate to the present. The 3D structural modeling revealed a fold belt (trending EW to NE-SW) accommodating the deformation between the Royal Charlotte and Sulphur Minerva volcanic highs. The volcanic eruptions have caused a differential overburden on the borders of the basin. This acted as the trigger for halokinesis, as demonstrated by physical modeling in literature. Consequently, the deformation tends to be higher in the edges of the basin. The volcanic rocks occur mainly as concordant structures (sills) in the syn-tectonic sediment deposition showing a concomitant deformation. The isopach maps and diagrams of axis orientation of deformation revealed that most of the folds were activated and reactivated at different times during the Cenozoic. The folds exhibit diverse kinematic patterns over time as response to behavior of adjacent volcanic highs. These interpretations allied with information on the petroleum system of the basin are important in mapping the prospects for hydrocarbons / A Bacia de Cumuruxatiba est? localizada no extremo sul da costa do Estado da Bahia, no Nordeste do Brasil. Esta bacia foi formada em ambiente distensional, com rifteamento e posterior fase termal durante o Neocomiano at? final do Cret?ceo. Durante o Cenoz?ico ocorre o magmatismo de Abrolhos na bacia com picos durante o Paleoceno e Eoceno. Neste per?odo ocorre uma invers?o cinem?tica na bacia representada por dobras relacionadas a falhas reversas. Restaura??es estruturais regionais de se??es s?smicas 2D, revelaram que a maior parte da deforma??o est? concentrada no inicio do Cenoz?ico com o pico no Eoceno Inferior. O per?odo p?s-Eoceno ? marcado pela diminui??o da taxa de deforma??o at? o presente. A modelagem estrutural 3D revelou uma frente de dobras (de orienta??o E-W variando para NE-SW) acomodando a deforma??o entre os altos vulc?nicos de Royal Charlotte e Sulphur Minerva. Os derrames vulc?nicos causaram uma sobrecarga diferencial nas bordas da bacia que serviu de gatilho para atua??o da halocinese, como j? demonstrado em modelagens f?sicas na literatura. Consequentemente, a deforma??o tende a ser maior na bordas da bacia. As rochas vulc?nicas ocorrem principalmente como estruturas concordantes (sills) nos sedimentos sin-tect?nicos revelando uma deposi??o concomitante ? deforma??o. O estudo dos mapas de is?pacas e diagramas com orienta??o do eixo de deforma??o revelaram que maior parte das dobras foram ativadas e reativadas em diferentes per?odos durante o Cenoz?ico. As dobras apresentam padr?es cinem?ticos variados ao longo do tempo que refletem a atua??o diferencial dos altos vulc?nicos adjacentes. Estas interpreta??es aliadas a informa??es sobre os sistemas petrol?feros da bacia s?o importantes no mapeamento dos prospectos para hidrocarbonetos

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-22T00:29:29Z No. of bitstreams: 1 RosanaMariaDoNascimento_TESE.pdf: 79491407 bytes, checksum: 65543c87c5a9f10fd3119a3ddf108730 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-22T23:55:31Z (GMT) No. of bitstreams: 1 RosanaMariaDoNascimento_TESE.pdf: 79491407 bytes, checksum: 65543c87c5a9f10fd3119a3ddf108730 (MD5) / Made available in DSpace on 2016-03-22T23:55:31Z (GMT). No. of bitstreams: 1 RosanaMariaDoNascimento_TESE.pdf: 79491407 bytes, checksum: 65543c87c5a9f10fd3119a3ddf108730 (MD5) Previous issue date: 2015-01-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / A Prov?ncia Borborema, localizada no nordeste do Brasil, possui um embasamento de idade Pr?-cambriana e um arcabou?o tect?nico estruturado no Neoproteroz?ico (740-560 Ma). Ap?s a separa??o dos continentes Sul-Americano e Africano, durante o Mesoz?ico formou-se um sistema de riftes no nordeste brasileiro, o qual deu origem ?s bacias marginais e interiores localizadas na Prov?ncia. Depois da separa??o continental, eventos de vulcanismos e epirogenia ocorreram na Prov?ncia, tais como o soerguimento do Planalto da Borborema e o magmatismo ao longo da linha Macau-Queimadas (AMQ), marcando assim a evolu??o da Prov?ncia. As causas do soerguimento do Planalto poderiam estar associadas a um underplating magm?tico (material m?fico preso na base da crosta), talvez relacionado com a gera??o de plugs continentais jovens (45-7 Ma) ao longo do AMQ devido a um mecanismo de convec??o em pequena escala na borda do continente. O objetivo deste trabalho ? investigar as causas do soerguimento intra-placa e sua poss?vel rela??o com o vulcanismo AMQ utilizando sismologia de banda larga, tendo em conta a correla??o de nossos resultados com estudos geof?sicos e geol?gicos realizados na Prov?ncia Borborema. As metodologias de banda larga para investigar a estrutura profunda na Prov?ncia incluem as fun??es do receptor e velocidade de dispers?o das ondas de superf?cie. Tanto as fun??es de receptor quanto a tomografia de dispers?o de ondas superficiais s?o m?todos que utilizam eventos teless?smicos e permitem obter estimativas de par?metros estruturais como espessura crustal, raz?o Vp/Vs e velocidade de onda S. Os sismogramas utilizados neste trabalho para as fun??es do receptor foram obtidas de 52 esta??es localizadas no Nordeste do Brasil: 16 esta??es de banda larga da rede RSISNE (Rede Sismogr?fica do Nordeste do Brasil), 21 esta??es de per?odo curto da rede INCT-ET (Instituto Nacional de Ci?ncia e Tecnologia ? Estudos Tect?nicos) e 6 esta??es de banda larga. Estes resultados acrescentam significativamente dados anteriores coletados em esta??es isoladas como a esta??o RCBR, da rede global GSN, as esta??es banda v larga CAUB e AGBL do projeto BLSP (Brazilian Lithosphere Seismic Project IAG/USP) e de 6 esta??es banda larga do projeto Mil?nio (Estudos geof?sicos e tect?nicos na Prov?ncia Borborema - CNPq). Para dispers?o de ondas de superf?cie foram usados sismogramas de 22 esta??es: 16 esta??es de banda larga da rede RSISNE, bem como das 6 esta??es banda larga do projeto Mil?nio. Neste trabalho foram desenvolvidas: (i) estimativas de espessura crustal e raz?o Vp/Vs para cada esta??o usando as fun??es do receptor, (ii) novas medidas de velocidade de grupo de ondas de superf?cie, que foram integradas com os percursos usados em uma tomografia da Am?rica do Sul, j? desenvolvida, para ampliar a resolu??o no Nordeste Brasileiro e (iii) modelos de velocidades de onda S (1D) para v?rios locais na Prov?ncia Borborema usando a invers?o simult?nea de fun??es do receptor com velocidades de dispers?o. Os resultados descrevem velocidades de onda S para a base da crosta que s?o consistentes com a presen?a de uma camada m?fica de 5-7.5 km de espessura. Foi observada a camada m?fica em apenas uma por??o da regi?o do planalto (parte sul) e aus?ncia da mesma na parte norte. Outra observa??o importante e que corrobora estudos de fun??es do receptor e refra??o s?smica s?o as diferentes espessuras crustais, tamb?m dividindo o planalto em uma parte de crosta fina (parte norte) e outra parte de crosta espessa (parte sul). Os modelos existentes para evidenciar a epirogenia n?o conseguem explicar todas essas observa??es. Sendo assim, prop?e-se que durante a orogenia Brasiliana, uma camada de material m?fico pr?-existente foi delaminada, total ou parcialmente, da crosta. A delamina??o parcial teria acontecido na parte sul do planalto, onde estudos independentes evidenciaram uma reologia mais resistente ? deforma??o. Ap?s isso, durante o Mesoz?ico e consequente processo de rifteamento houve afinamento da crosta da regi?o costeira e depress?o sertaneja, incluindo a parte norte do planalto. J? no Cenoz?ico, o soerguimento da parte norte do planalto teria ocorrido e o resultado seria uma parte norte sem material m?fico na base da crosta e parte sul com camada m?fica parcialmente delaminada,mas ambos com topografia elevada at? os dias atuais. / The Borborema Province, located in northeastern Brazil, has a basement of Precambrian age and a tectonic framework structured at the Neoproterozoic (740-560 Ma). After separation between South America and Africa during the Mesozoic, a rift system was formed, giving rise to a number of marginal and inland basins in the Province. After continental breakup, episodes of volcanism and uplift characterized the evolution of the Province. Plateau uplift was initially related to magmatic underplating of mafic material at the base of the crust, perhaps related to the generation of young continental plugs (45-7 Ma) along the Macau-Queimadas Alignment (MQA), due to a small-scale convection at the continental edge. The goal of this study is to investigate the causes of intra-plate uplift and its relationship to MQA volcanism, by using broadband seismology and integrating our results with independent geophysical and geological studies in the Borborema Province. The investigation of the deep structure of the Province with broadband seismic data includes receiver functions and surface-wave dispersion tomography. Both the receiver functions and surface-wave dispersion tomography are methods that use teleseismic events and allow to develop estimates of crustal parameters such as crustal thickness, Vp/Vs ratio, and S-velocity structure. The seismograms used for the receiver function work were obtained from 52 stations in Northeast Brazil: 16 broadband stations from the RSISNE network (Rede Sismogr?fica do Nordeste do Brasil), and 21 short-period and 6 broadband stations from the INCT-ET network (Instituto Nacional de Ci?ncia e Tecnologia ? Estudos Tect?nicos). These results add signifi- cantly to previous datasets collected at individual stations in the Province, which include station RCBR (GSN - Global Seismic Network), stations CAUB and AGBL (Brazilian Lithosphere Seismic Project IAG/USP), and 6 other broadband stations that were part of the Projeto Mil?nio - Estudos geof?sicos e tect?nicos na Prov?ncia Borborema/CNPq. For the surface-wave vii tomography, seismograms recorde at 22 broadband stations were utilized: 16 broadband stations from the RSISNE network and 6 broadband stations from the Mil?nio project. The new constraints developed in this work include: (i) estimates of crustal thickness and bulk Vp/Vs ratio for each station using receiver functions; (ii) new measurements of surfassewave group velocity, which were integrated to existing measurementes from a continental-scale tomography for South America, and (iii) S-wave velocity models (1D) at various locations in the Borborema Province, developed through the simultaneous inversion of receiver functions and surface-wave dispersion velocities. The results display S-wave velocity structure down to the base of the crust that are consistent with the presence of a 5-7.5 km thick mafic layer. The mafic layer was observed only in the southern portion of the Plateau and absent in its northern portion. Another important observation is that our models divide the plateau into a region of thin crust (northern Plateau) and a region of thick crust (southern Plateau), confirming results from independent refraction surveys and receiver function analyses. Existing models of plateau uplift, nonetheless, cannot explain all the new observations. It is proposed that during the Brazilian orogeny a layer of preexisting mafic material was delaminated, as a whole or in part, from the original Brasiliano crust. Partial delamination would have happened in the southern portion of the plateau, where independent studies found evidence of a more resistant rheology. During Mesozoic rifting, thinning of the crust around the southern Plateau would have formed the marginal basins and the Sertaneja depression, which would have included the northern part of the Plateau. In the Cenozoic, uplift of the northern Plateau would have occurred, resulting in a northern Plateau without mafic material at the base of the crust and a southern Plateau with partially delaminated mafic layer.