Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-08-01T15:22:11Z No. of bitstreams: 1 JoseWilamyCosmeRabelo_DISSERT.pdf: 1459409 bytes, checksum: 267df4a3dffe457c4c17c4f28d860612 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-08-09T13:32:24Z (GMT) No. of bitstreams: 1 JoseWilamyCosmeRabelo_DISSERT.pdf: 1459409 bytes, checksum: 267df4a3dffe457c4c17c4f28d860612 (MD5) / Made available in DSpace on 2017-08-09T13:32:24Z (GMT). No. of bitstreams: 1 JoseWilamyCosmeRabelo_DISSERT.pdf: 1459409 bytes, checksum: 267df4a3dffe457c4c17c4f28d860612 (MD5) Previous issue date: 2017-06-22 / A Escola Multicampi de Ci?ncias M?dicas da Universidade Federal do Rio Grande do Norte (EMCM-UFRN) foi criada em 2013 com a implanta??o do curso de Medicina com campus no interior, no munic?pio de Caic?. O Projeto Pol?tico Pedag?gico (PPP) da EMCM segue o preconizado pelas Diretrizes Curriculares Nacionais (DCNs) do Curso de Gradua??o em Medicina ao adotar metodologias de ensino-aprendizagem centradas no aluno, tendo o professor como facilitador deste processo. A integra??o entre os conte?dos sob uma ?tica contextualizada leva a melhor compreens?o para uma aplica??o imediata dos saberes. Os conte?dos de Medicina Laboratorial (ML) est?o presentes em diversos segmentos do curr?culo do curso, sendo a disciplina ML, uma optativa que visa incrementar as habilidades de solicita??o/interpreta??o de dados laboratoriais, considerando o custo-benef?cio. O objetivo deste trabalho ? construir e aplicar a disciplina de ML utilizando metodologias ativas de ensino-aprendizagem a estudantes de medicina da EMCM e avaliar sua percep??o. Ao final da disciplina, foi aplicado um instrumento com 40 itens para avaliar o grau de concord?ncia dos estudantes sobre a efetividade do emprego de metodologia ativa na disciplina de ML. Utilizando a escala Likert, foram calculadas as m?dias, desvios padr?es (DP) modas e medianas das respostas, al?m de categorizar as m?dias em Ruins, Regulares ou Boas. Contando com a participa??o de 25 estudantes, foram analisadas as respostas sobre as tem?ticas: 1 - Disciplina, 2 - Infraestrutura, 3- Professores e 4 ? Alunos. A concentra??o das m?dias pr?xima ao limite superior da escala sugere positiva a percep??o dos alunos frente ?s quatro tem?ticas avaliadas. A maioria das m?dias dos itens se encaixaram na categoria Bom, sendo que nenhum item foi categorizado como Ruim. A partir da percep??o dos estudantes, ? poss?vel concluir que o emprego de metodologias ativas na disciplina ML pode levar o estudante a despertar a motiva??o intr?nseca pelo aprendizado, o que facilita o processo de ensino-aprendizagem. / The Multicampi School of Medical Sciences of the Federal University of Rio Grande do Norte (EMCM-UFRN) was created in 2013 with the implementation of the Medicine course with campus in the interior, in the municipality of Caic?. The EMCM's Pedagogical Political Project (PPP) follows the National Curricular Guidelines (DCNs) of the Medical Graduation Course by adopting student-centered teaching-learning methodologies, with the teacher as facilitator of this process. The integration of content from a contextualized perspective leads to a better understanding of the immediate application of knowledge. The contents of Laboratory Medicine (LM) are present in several segments of the curriculum of the course, being the LM discipline, an optional one that aims to increase the skills of requesting / interpreting laboratory data, considering cost-benefit. The objective of this study is to build and apply the ML discipline using active teaching-learning methodologies to EMCM medical students and to evaluate their perception. At the end of the course, an instrument with 40 items was applied to evaluate the students' degree of agreement on the effectiveness of the active methodology in LM. Using the Likert scale, the averages, standard deviations (SD), mode and medians of the responses were calculated, in addition to categorizing the averages in Bad, Regular or Good. With the participation of 25 students, the answers on the topics were analyzed: 1 - Discipline, 2 - Infrastructure, 3 - Teachers and 4 - Students. The concentration of means near the upper limit of the scale suggests a positive perception of the students in relation to the four themes evaluated. Most of the item averages fallen into the Good category, and no item was categorized as Bad. From the students' perceptions, it is possible to conclude that the use of active methodologies in the LM discipline can lead the student to awaken the intrinsic motivation for learning, which facilitates the teaching-learning process.

Submitted by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-04-20T12:47:20Z No. of bitstreams: 1 JussaraRibeiroDissertacao2016.pdf: 1633683 bytes, checksum: bc56d87d5073ee0367b3355ccad9bf94 (MD5) / Approved for entry into archive by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-04-20T12:47:41Z (GMT) No. of bitstreams: 1 JussaraRibeiroDissertacao2016.pdf: 1633683 bytes, checksum: bc56d87d5073ee0367b3355ccad9bf94 (MD5) / Made available in DSpace on 2017-04-20T12:47:41Z (GMT). No. of bitstreams: 1 JussaraRibeiroDissertacao2016.pdf: 1633683 bytes, checksum: bc56d87d5073ee0367b3355ccad9bf94 (MD5) Previous issue date: 2016-03-10 / The existence of bubbles in stock markets can be detected by analyzing the relationship between stock prices and dividends. In Brazil, several studies use the Bovespa index as a proxy for stock prices, but differ in the index used as a proxy for dividends paid in the country. There are studies that create a monthly dividend index based on the theoretical portfolio and on the methodology of the Bovespa index. However, this dividend index has periods of great instability due to high concentration in the participation of some shares in the index. The objective of this study was to create an index that represents the dividend distribution in the Brazilian stock market using series provided by the Central Bank and the IBGE. The dividend index showed a smoother behavior, without periods of great instability or breaks. It was used as a proxy of the dividends in tests to verify the presence of bubbles. Three types of rational bubbles were studied: explosive bubbles, periodically collapsing bubbles and intrinsic bubbles. The tests results indicated that it is not possible to rule out the presence of explosive bubbles and detected evidences of the presence of periodically collapsing bubbles in the Brazilian stock market in this period. However, no evidence of the presence of intrinsic bubbles was found. / A presen??a de bolhas no mercado de a????es pode ser detectada por meio da an??lise da rela????o existente entre os pre??os das a????es e seus dividendos. Na literatura brasileira, diversos trabalhos utilizam o ??ndice Bovespa como proxy dos pre??os, mas diferem quanto ao ??ndice utilizado como proxy dos dividendos distribu??dos no pa??s. H?? trabalhos que constroem um ??ndice de dividendos mensal baseado nas carteiras te??ricas e na metodologia do Ibovespa. Por??m, tal ??ndice apresenta per??odos de grande instabilidade decorrentes da concentra????o na participa????o de determinadas a????es no ??ndice. Diante disso, o objetivo do presente trabalho foi construir um ??ndice que represente a distribui????o de dividendos no mercado acion??rio brasileiro a partir de s??ries fornecidas pelo Banco Central e pelo IBGE, tendo como refer??ncia a Lei das Sociedades por A????es. O ??ndice constru??do apresentou um comportamento mais suave, sem per??odos de grande instabilidade ou quebras. Ele foi, ent??o, utilizado como proxy dos dividendos em testes para verificar a presen??a de bolhas no mercado de a????es. Tr??s tipos de bolhas racionais foram estudados: bolhas explosivas, bolhas que estouram periodicamente e bolhas intr??nsecas. Os resultados dos testes indicaram que n??o ?? poss??vel descartar a presen??a de bolhas explosivas e detectaram ind??cios da presen??a de bolhas que estouram periodicamente no mercado de a????es brasileiro no per??odo analisado. N??o foram encontrados, por??m, ind??cios da presen??a de bolhas intr??nsecas nesse mercado.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-07-03T13:49:24Z No. of bitstreams: 1 RenatoDeSouzaArruda_DISSERT.pdf: 10252743 bytes, checksum: 13ba4780aafe9e605d95a0d7755595a5 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-07-07T14:58:37Z (GMT) No. of bitstreams: 1 RenatoDeSouzaArruda_DISSERT.pdf: 10252743 bytes, checksum: 13ba4780aafe9e605d95a0d7755595a5 (MD5) / Made available in DSpace on 2017-07-07T14:58:37Z (GMT). No. of bitstreams: 1 RenatoDeSouzaArruda_DISSERT.pdf: 10252743 bytes, checksum: 13ba4780aafe9e605d95a0d7755595a5 (MD5) Previous issue date: 2017-03-09 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / A avalia??o integrada de vulnerabilidade intr?nseca de um aqu?fero constitui uma ferramenta de suma import?ncia como subs?dio ao estabelecimento de pol?ticas p?blicas de preserva??o, prote??o e uso hidroambiental sustent?vel de um manancial subterr?neo. Nesse aspecto, o presente trabalho teve como escopo principal a elabora??o de mapeamentos de vulnerabilidade a partir de dados hidrogeof?sicos, objetivando a identifica??o e delimita??o de sub?reas com diferentes graus de prote??o associados com diferentes vulnerabilidades do Aqu?fero Barreiras, na ?rea do baixo curso do Rio Maxaranguape, nordeste do Brasil. Esses mapeamentos foram elaborados mediante as metodologias Condut?ncia El?trica Longitudinal, GOD (G - natureza do aqu?fero, O - litologia da zona n?o saturada, D - profundidade do n?vel d??gua) e do ?ndice de Vulnerabilidade do Aqu?fero (AVI), as quais s?o fundamentadas em par?metros litol?gicos, hidr?ulicos e geoel?tricos, al?m da espessura da zona n?o saturada. Os resultados obtidos mostram que os dom?nios delimitados por ?ndices de vulnerabilidade s?o aproximadamente concordantes entre si. Em linhas gerais, as classes de vulnerabilidades moderada, alta a extremamente alta, abrangem quase a totalidade da ?rea, delineando tanto a faixa central como a por??o norte e sul da ?rea investigada, conforme valores inferiores a 1 do log c e 5 mS, nas metodologias AVI e de Condut?ncia Longitudinal, respectivamente; e magnitudes superiores a 0.4, segundo a metodologia GOD. Nesse sentido, a ?rea de estudo exibe substancial sensibilidade ? contamina??o de suas ?guas subterr?neas, decorrente essencialmente do cen?rio de ocorr?ncia de forma??es sedimentares de elevada permeabilidade e reduzidas profundidades do n?vel fre?tico, facilitando a percola??o de eventuais cargas contaminantes no sentido do aqu?fero. / The integrated assessment of an aquifer intrinsic vulnerability constitutes an extremely important tool as a subsidy to the establishment of public policies for the preservation, protection and sustainable hydro-environmental use of an underground water source. In this aspect, the main purpose of this work was the elaboration of vulnerability mappings based on hydrogeophysical data, aiming at the identification and delimitation of subareas with different degrees of protection associated with different vulnerabilities of the Barreiras Aquifer in the lower course area of the Maxaranguape River, Northeast of Brazil. These mappings were elaborated using the following methodologies such as Longitudinal Electrical Conductance, GOD (G ? groundwater hydraulic confinement; O ? overlaying strata; D ? depth to groundwater table) and Aquifer Vulnerability Indexes (AVI), which are based on lithological, hydraulic and geoelectric parameters, as well as the thickness of the unsaturated zone. The results show that the domains delimited by vulnerability indexes are approximately concordant with each other. In general terms, the moderate, high to extremely high vulnerability classes cover almost the entire area, delineating both the central and the northern and southern portions of the investigated area, according to values lower than 1 of log c and 5 mS, in the AVI and Longitudinal Conductance methodologies, respectively; and magnitudes higher than 0.4, according to the GOD methodology. Therefore, the study area exhibits a substantial susceptibility to the contamination of its groundwater, mainly due to the occurrence of sedimentary formations with high permeability and reduced depths of the water table, facilitating the percolation of possible contaminant loads towards the aquifer.

The docotoral thesis titled 'Modeling the effects of Transient Stream Flow on Solute Dynamics in Stream Banks and Intra-meander Zones' investigates flow and solute dynamcis across surface water-groundwater interface under dynamic flow conditons through numerical simulations. The abstract of the thesis is as follows: Waters from various sources meet at the interface between streams and groundwater. Due to their different origins, these waters often have contrasting chemical signatures and therefore mixing of water at the interface may lead to significant changes in both surface and subsurface water quality. The riparian zone adjacent to the stream serves as transition region between groundwater and stream water, where complex water and solute mixing and transport processes occur. Predicting the direction and the magnitude of solute exchanges and the extent of transformations within the riparian zone is challenging due to the varying hydrologic and chemical conditions as well as heterogeneous morphological features which result in complex, three-dimensional flow patterns. The direction of water flow and solute transport in the riparian zone typically varies over time as a result of fluctuating stream water and groundwater levels. Particularly, increasing groundwater levels can mobilize solutes from the unsaturated zone which can be subsequently transported into the stream. Such complex, spatially and temporally varying processes are hard to capture with field observations alone and therefore modeling approaches are required to predict the system behavior as well as to understand the role of individual factors. In this thesis, we investigate the inter-connectivity of streamthe s and adjacent riparia zones in the context of water and solute exchanges both laterally for bank storage and longitudinally for hyporheic flow through meander bends. Using numerical modeling, the transient effect of stream flow events on solute transport and transformation within the initially unsaturated part of stream banks and meander bends have been simulated using a systematic set of hydrological, chemical and morphological scenarios. A two dimensional variably saturated media groundwater modeling set up was used to explore solute dynamics during bank flows. We simulated exchanges between stream and adjacent riparian zone driven by stream stage fluctuations during stream discharge events. To elucidate the effect of magnitude and duration of discharge events, we developed a number of single discharge event scenarios with systematically varying peak heights and event duration. The dominant solute layer was represented by applying high solute concentration in upper unsaturated riparian zone profile. Simulated results show that bank flows generated by high stream flow events can trigger solute mobilization in near stream riparian soils and subsequently export significant amounts of solutes into the stream. The timing and amount of solute export is linked to the shape of the discharge event. Higher peaks and increased duration significantly enhance solute export, however, peak height is found to be the dominant control for overall lateral mass export. The mobilized solutes are transported towards the stream in two stages (1) by return flow of stream water that was stored in the riparian zone during the event and (2) by vertical movement to the groundwater under gravity drainage from the unsaturated parts of the riparian zone, which lasts for significantly longer time (> 400 days) resulting in a theoretically long tailing of bank outflows and solute mass outfluxes. Our bank flow simulations demonstrate that strong stream discharge events are likely to mobilize and export significant quantity of solutes from near stream riparian zones into the stream. Furthermore, the impact of short-term stream discharge variations on solute exchange may sustain for long times after the flow event. Meanders are prominent morphological features of stream systems which exhibit unique hydrodynamics. The water surface elevation difference across the inner bank of a meander induces lateral hyporheic exchange flow through the intrameander region, leading to solute transport and reactions within intra-meander region. We examine the impact of different meander geometries on the intra-meander hyporheic flow field and solute mobilization under both steady-state and transient flow conditions. In order to explore the impact of meander morphology on intrameander flow, a number of theoretical meander shape scenarios, representing various meander evolution stages, ranging from a typical initial to advanced stage (near cut off ) meander were developed. Three dimensional steady-state numerical groundwater flow simulations including the unsaturated zone were performed for the intra-meander region for all meander scenarios. The meandering stream was implemented in the model by adjusting the top layers of the modeling domain to the streambed elevation. Residence times for the intra-meander region were computed by advective particle tracking across the inner bank of meander. Selected steady state cases were extended to transient flow simulations to evaluate the impact of stream discharge events on the temporal behavior of the water exchange and solute transport in the intra-meander region. Transient hydraulic heads obtained from the surface water model were applied as transient head boundary conditions to the streambed cells of the groundwater model. Similar to the bank storage case, a high concentration of solute (carbon source) representing the dominant solute layer in the riparian profile was added in the unsaturated zone to evaluate the effect of stream flow event on mobilization and transport from the unsaturated part of intrameander region. Additionally, potential chemical reactions of aerobic respiration by the entry of oxygen rich surface water into subsurface as well denitrification due to stream and groundwater borne nitrates were also simulated. The results indicate that intra-meander mean residence times ranging from 18 to 61 days are influenced by meander geometry, as well as the size of the intra-meander area. We found that, intra-meander hydraulic gradient is the major control of RTs. In general, larger intra-meander areas lead to longer flow paths and higher mean intra-meander residence times (MRTs), whereas increased meander sinuosity results in shorter MRTs. The vertical extent of hyporheic flow paths generally decreases with increasing sinuosity. Transient modeling of hyporheic flow through meanders reveals that large stream flow events mobilize solutes from the unsaturated portion of intra-meander region leading to consequent transport into the stream via hyporheic flow. Advective solute transport dominates during the flow event; however significant amount of carbon is also consumed by aerobic respiration and denitrification. These reactions continue after the flow events depending upon the availability of carbon source. The thesis demonstrates that bank flows and intra-meander hyporheic exchange flows trigger solute mobilization from the dominant solute source layers in the RZ. Stream flow events driven water table fluctuations in the stream bank and in the intra-meander region transport substantial amount of solutes from the unsaturated RZ into the stream and therefore have significant potential to alter stream water quality.:Declaration Abstract Zusammenfassung 1 General Introduction 1.1 Background and Motivation 1.2 Hydrology and Riparian zones 1.2.1 Transport processes driven by fluctuation in riparian water table depth 1.2.1.1 Upland control 1.2.1.2 Stream control 1.2.2 Biochemical Transformations within the Riparian Zone 1.3 Types and scales of stream-riparian exchange 1.3.1 Hyporheic Exchange 1.3.1.1 Small Scale Vertical HEF 1.3.1.2 Large Scale lateral HEF 1.3.2 Bank Storage 1.4 Methods for estimation of GW-SW exchanges 1.4.1 Field Methods 1.4.1.1 Direct measurement of water flux 1.4.1.2 Tracer based Methods 1.4.2 Modeling Methods 1.4.2.1 Transient storage models 1.4.2.2 Physically based models 1.5 Research gaps and need 1.6 Objectives of the research 1.7 Thesis Outline 2 Flow and Transport Dynamics during Bank Flows 2.1 Introduction 2.2 Methods 2.2.1 Concept and modeling setup 2.2.2 Numerical Model 2.2.3 Stream discharge events 2.2.4 Model results evaluation 2.3 Results and discussion 2.3.1 Response of water and solute exchange to stream discharge events 2.3.1.1 Water exchange time scales 2.3.1.2 Stream water solute concentration 2.3.2 Solute mobilization within the riparian zone 2.3.3 Influence of peak height and event duration on solute mass export towards the stream 2.3.4 Effects of event hydrograph shape on stream water solute concentration 2.3.5 Model limitations and future studies 2.4 Summary and Conclusions Appendix 2 3 Flow and Transport Dynamics within Intra-Meander Zone 3.1 Introduction 3.2 Methods 3.2.1 Meander Shape Scenarios 3.2.2 Surface Water Simulations 3.2.3 3D Groundwater Flow Simulations with Modeling code MIN3P 3.2.3.1 Steady Flow Simulations 3.2.3.2 Stream flow event and Solute Mobilization Set-up 3.2.4 Reactive Transport 3.3 Results and Discussion 3.3.1 Groundwater heads and flow paths in the saturated intrameander zone 3.3.1.1 Groundwater heads 3.3.1.2 Flow paths and isochrones 3.3.1.3 Vertical extent of flow paths 3.3.2 Intra-Meander Residence Time Distribution 3.3.3 Factors affecting intra-meander flow and residence times 3.3.3.1 intra-meander hydraulic gradient 3.3.3.2 Maximum penetration depth 3.3.3.3 Meander sinuosity 3.3.3.4 intra-meander area (A) 3.3.4 Influence of Discharge Event on intra-meander Flow and Solute Transport 3.3.4.1 Spatial distribution of groundwater head and solute concentration 3.3.4.2 Time scales of intra-meander groundwater heads and solute transport 3.3.4.3 Solute export during stream discharge event 3.3.5 Intra-meander reactive transport during stream discharge event 3.3.5.1 Impact of stream discharge on aerobic respiration and denitrification 3.3.5.2 DOC mass removal during stream discharge event 3.4 Summary and Conclusions Appendix 3 4 General Summary and Conclusions 4.1 Summary 4.2 Conclusions 4.2.1 Flow and Transport Dynamics in Near Stream Riparian Zone (Bank Flows) 4.2.2 Flow and Transport Dynamics within Intra-Meander Zone 4.3 Model Limitations and Future Studies Bibliography Acknowledgement

Submitted by SBI Biblioteca Digital (sbi.bibliotecadigital@puc-campinas.edu.br) on 2016-04-06T11:44:18Z No. of bitstreams: 1 Maria Cristina Matoso.pdf: 2151922 bytes, checksum: 1bcf5b83eba06c89f6a5096d658c6c81 (MD5) / Made available in DSpace on 2016-04-06T11:44:18Z (GMT). No. of bitstreams: 1 Maria Cristina Matoso.pdf: 2151922 bytes, checksum: 1bcf5b83eba06c89f6a5096d658c6c81 (MD5) Previous issue date: 2004-06-28 / Pontif?cia Universidade Cat?lica de Campinas ? PUC Campinas / Analysis of the symbolic dimension of the scientific journal, of what it represents to the scientific community, this dissertation emphasizes the importance of the mechanisms that attribute value to the scientific journal. It especially considers the creation of institutions whose objectives are to promote and stimulate the development of scientific and technological research, and whose policies support scientific publications. The corpus of the research is constituted by the scientific periodicals covering the area of Nutrition. The analysis focuses on their indexes, their explicit criteria for manuscripts? evaluation and selection by the scientific referees, and the composition of their Editorial Boards ? taking into account that authors may also perform the roles of editor or board member. The research results show how recent is the area of Nutrition and how the journals in such area need to reevaluate their objectives. It concludes that it?s necessary that journals adopt norms and specific patterns, besides proceeding to the selection and revision of the articles already entrenched in scientific editing, in order to have them indexed in mechanisms of the Nutrition area. Such procedures will assure that Brazilian science articles will be available at the main national and international database. / An?lise da dimens?o simb?lica da revista cient?fica, ou seja, o que ela representa para a comunidade cient?fica. Destaca-se a import?ncia dos mecanismos que atribuem valor ao peri?dico cient?fico, enfatizando-se a relev?ncia da cria??o dos ?rg?os de fomento que, al?m de promoverem e estimularem o desenvolvimento das investiga??es cient?ficas e tecnol?gicas, praticam pol?ticas de apoio ? publica??o cient?fica. Constitui o corpus desta pesquisa os peri?dicos cient?ficos da ?rea da Nutri??o, dos quais se analisar? a indexa??o, os crit?rios expl?citos de sele??o e avalia??o dos manuscritos pelos revisores cient?ficos, al?m da composi??o do Corpo Editorial considerando-se que o pesquisador-autor pode ainda desempenhar o papel de editor ou de membro do conselho editorial. Os resultados desta pesquisa indicam que a ?rea da Nutri??o ? ainda jovem e que os peri?dicos cient?ficos espec?ficos dessa ?rea precisam redimensionar os seus objetivos. ? necess?rio que adotem normas e padr?es espec?ficos, al?m de proceder ? sele??o e revis?o dos artigos j? sedimentados na editora??o cient?fica, almejando a sua indexa??o em mecanismos da ?rea. Tais procedimentos garantir?o a presen?a dos artigos da ci?ncia brasileira nas principais bases de dados nacionais e internacionais.